feat: add more PDF formats, drastically improve LibreOffice long-running instance management

Makefile

@@ -51,7 +51,8 @@ PROMETHEUS_NAMESPACE=gotenberg
 PROMETHEUS_COLLECT_INTERVAL=1s
 PROMETHEUS_DISABLE_ROUTE_LOGGING=false
 PROMETHEUS_DISABLE_COLLECT=false
-UNOCONV_DISABLE_LISTENER=false
+UNO_LISTENER_START_TIMEOUT=10s
+UNO_LISTENER_RESTART_THRESHOLD=10
 WEBHOOK_ALLOW_LIST=
 WEBHOOK_DENY_LIST=
 WEBHOOK_ERROR_ALLOW_LIST=
@@ -93,7 +94,8 @@ run: ## Start a Gotenberg container
 	--prometheus-collect-interval=$(PROMETHEUS_COLLECT_INTERVAL) \
 	--prometheus-disable-route-logging=$(PROMETHEUS_DISABLE_ROUTE_LOGGING) \
 	--prometheus-disable-collect=$(PROMETHEUS_DISABLE_COLLECT) \
-	--unoconv-disable-listener=$(UNOCONV_DISABLE_LISTENER) \
+	--uno-listener-start-timeout=$(UNO_LISTENER_START_TIMEOUT) \
+	--uno-listener-restart-threshold=$(UNO_LISTENER_RESTART_THRESHOLD) \
 	--webhook-allow-list=$(WEBHOOK_ALLOW_LIST) \
 	--webhook-deny-list=$(WEBHOOK_DENY_LIST) \
 	--webhook-error-allow-list=$(WEBHOOK_ERROR_ALLOW_LIST) \

build/Dockerfile

@@ -157,6 +157,7 @@ COPY --from=builder /home/gotenberg /usr/bin/
 ENV GC_EXCLUDE_SUBSTR "hsperfdata_root,hsperfdata_gotenberg"
 ENV CHROMIUM_BIN_PATH /usr/bin/chromium
 ENV UNOCONV_BIN_PATH /usr/bin/unoconv
+ENV LIBREOFFICE_BIN_PATH /usr/lib/libreoffice/program/soffice.bin
 ENV PDFTK_BIN_PATH /usr/bin/pdftk
 ENV QPDF_BIN_PATH /usr/bin/qpdf
 

pkg/gotenberg/cmd.go

@@ -73,22 +73,37 @@ func (cmd Cmd) Start() error {
 	return nil
 }
 
+// Wait waits for the command to complete. It should be called when using the
+// Start method, so that the command does not leak zombies.
+func (cmd Cmd) Wait() error {
+	err := cmd.process.Wait()
+	if err != nil {
+		return fmt.Errorf("wait for unix process: %w", err)
+	}
+
+	return nil
+}
+
 // Exec executes the command and wait for its completion or until the context
 // is done. In any case, it kills the unix process and all its children.
-func (cmd Cmd) Exec() error {
+func (cmd Cmd) Exec() (int, error) {
 	if cmd.ctx == nil {
-		return errors.New("nil context")
+		return 10, errors.New("nil context")
 	}
 
 	err := cmd.Start()
 	if err != nil {
-		return fmt.Errorf("start command: %w", err)
+		if cmd.process.ProcessState == nil {
+			return 131, fmt.Errorf("start command: %w", err)
+		}
+
+		return cmd.process.ProcessState.ExitCode(), fmt.Errorf("start command: %w", err)
 	}
 
 	errChan := make(chan error, 1)
 
 	go func() {
-		errChan <- cmd.process.Wait()
+		errChan <- cmd.Wait()
 	}()
 
 	select {
@@ -99,17 +114,21 @@ func (cmd Cmd) Exec() error {
 		}
 
 		if err == nil {
-			return nil
+			return 0, nil
 		}
 
-		return fmt.Errorf("unix process error: %w", err)
+		if cmd.process.ProcessState == nil {
+			return 131, fmt.Errorf("unix process error: %w", err)
+		}
+
+		return cmd.process.ProcessState.ExitCode(), fmt.Errorf("unix process error: %w", err)
 	case <-cmd.ctx.Done():
 		errProc := cmd.Kill()
 		if errProc != nil {
 			cmd.logger.Error(errProc.Error())
 		}
 
-		return fmt.Errorf("context done: %w", cmd.ctx.Err())
+		return 62, fmt.Errorf("context done: %w", cmd.ctx.Err())
 	}
 }
 

pkg/gotenberg/cmd_test.go

@@ -12,209 +12,313 @@ func TestCommand(t *testing.T) {
 	cmd := Command(zap.NewNop(), "foo")
 
 	if !cmd.process.SysProcAttr.Setpgid {
-		t.Error("expected Setpgid to be true")
+		t.Error("expected cmd.process.SysProcAttr.Setpgid to be true")
 	}
 }
 
 func TestCommandContext(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       context.Context
-		expectErr bool
+	tests := []struct {
+		name                    string
+		ctx                     context.Context
+		expectCommandContextErr bool
 	}{
 		{
-			ctx:       nil,
-			expectErr: true,
+			name: "nominal behavior",
+			ctx:  context.Background(),
 		},
 		{
-			ctx: context.TODO(),
+			name:                    "nil context",
+			expectCommandContextErr: true,
 		},
-	} {
-		cmd, err := CommandContext(tc.ctx, zap.NewNop(), "foo")
+	}
 
-		if err == nil && !cmd.process.SysProcAttr.Setpgid {
-			t.Fatalf("test %d: expected Setpgid to be true", i)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			cmd, err := CommandContext(tc.ctx, zap.NewNop(), "foo")
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+			if err == nil && !cmd.process.SysProcAttr.Setpgid {
+				t.Fatal("expected cmd.process.SysProcAttr.Setpgid to be true")
+			}
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectCommandContextErr && err == nil {
+				t.Error("expected error from CommandContext(), but got none")
+			}
+
+			if !tc.expectCommandContextErr && err != nil {
+				t.Errorf("expected no error from CommandContext(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestCmd_Start(t *testing.T) {
-	for i, tc := range []struct {
-		cmd       Cmd
-		expectErr bool
+	tests := []struct {
+		name           string
+		cmd            Cmd
+		expectStartErr bool
 	}{
 		{
-			cmd:       Command(zap.NewNop(), "foo"),
-			expectErr: true,
+			name: "nominal behavior",
+			cmd:  Command(zap.NewNop(), "echo", "Hello", "World"),
 		},
 		{
-			cmd: Command(zap.NewNop(), "echo", "Hello", "World"),
+			name:           "start error",
+			cmd:            Command(zap.NewNop(), "foo"),
+			expectStartErr: true,
 		},
-	} {
-		err := tc.cmd.Start()
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.cmd.Start()
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectStartErr && err == nil {
+				t.Error("expected error from cmd.Start(), but got none")
+			}
+
+			if !tc.expectStartErr && err != nil {
+				t.Errorf("expected no error from cmd.Start(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestCmd_Wait(t *testing.T) {
+	tests := []struct {
+		name          string
+		cmd           Cmd
+		expectWaitErr bool
+	}{
+		{
+			name: "nominal behavior",
+			cmd: func() Cmd {
+				cmd := Command(zap.NewNop(), "echo", "Hello", "World")
+
+				err := cmd.Start()
+				if err != nil {
+					t.Fatalf("expected no error from cmd.Start(), but got: %v", err)
+				}
+
+				return cmd
+			}(),
+		},
+		{
+			name: "wait error",
+			cmd: func() Cmd {
+				cmd := Command(zap.NewNop(), "echo", "Hello", "World")
+
+				err := cmd.Start()
+				if err != nil {
+					t.Fatalf("expected no error from cmd.Start(), but got: %v", err)
+				}
+
+				err = cmd.Kill()
+				if err != nil {
+					t.Fatalf("expected no error from cmd.Kill(), but got: %v", err)
+				}
+
+				return cmd
+			}(),
+			expectWaitErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.cmd.Wait()
+
+			if tc.expectWaitErr && err == nil {
+				t.Error("expected error from cmd.Wait(), but got none")
+			}
+
+			if !tc.expectWaitErr && err != nil {
+				t.Errorf("expected no error from cmd.Wait(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestCmd_Exec(t *testing.T) {
-	for i, tc := range []struct {
-		cmd       Cmd
-		timeout   time.Duration
-		expectErr bool
+	tests := []struct {
+		name          string
+		cmd           Cmd
+		timeout       time.Duration
+		expectExecErr bool
 	}{
 		{
-			cmd:       Command(zap.NewNop(), "foo"),
-			expectErr: true,
+			name: "nominal behavior",
+			cmd: func() Cmd {
+				cmd, err := CommandContext(context.Background(), zap.NewNop(), "echo", "Hello", "World")
+				if err != nil {
+					t.Fatalf("expected no error from CommandContext(), but got: %v", err)
+				}
+
+				return cmd
+			}(),
 		},
 		{
-			cmd:       Command(zap.NewNop(), "foo"),
-			timeout:   time.Duration(5) * time.Second,
-			expectErr: true,
+			name:          "nil context",
+			cmd:           Command(zap.NewNop(), "echo", "Hello", "World"),
+			expectExecErr: true,
 		},
 		{
-			cmd:     Command(zap.NewNop(), "echo", "Hello", "World"),
-			timeout: time.Duration(5) * time.Second,
+			name: "start error",
+			cmd: func() Cmd {
+				cmd, err := CommandContext(context.Background(), zap.NewNop(), "foo")
+				if err != nil {
+					t.Fatalf("expected no error from CommandContext(), but got: %v", err)
+				}
+
+				return cmd
+			}(),
+			expectExecErr: true,
 		},
 		{
-			cmd:       Command(zap.NewNop(), "sleep", "3"),
-			timeout:   time.Duration(2) * time.Second,
-			expectErr: true,
+			name:          "context done",
+			cmd:           Command(zap.NewNop(), "sleep", "2"),
+			timeout:       time.Duration(1) * time.Second,
+			expectExecErr: true,
 		},
-	} {
-		if tc.timeout > 0 {
-			ctx, cancel := context.WithTimeout(context.TODO(), tc.timeout)
-			defer cancel()
+	}
 
-			tc.cmd.ctx = ctx
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.timeout > 0 {
+				ctx, cancel := context.WithTimeout(context.TODO(), tc.timeout)
+				defer cancel()
 
-		err := tc.cmd.Exec()
+				tc.cmd.ctx = ctx
+			}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+			_, err := tc.cmd.Exec()
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectExecErr && err == nil {
+				t.Error("expected error from cmd.Exec(), but got none")
+			}
+
+			if !tc.expectExecErr && err != nil {
+				t.Errorf("expected no error from cmd.Exec(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestCmd_pipeOutput(t *testing.T) {
-	for i, tc := range []struct {
-		cmd       Cmd
-		run       bool
-		expectErr bool
+	tests := []struct {
+		name                string
+		cmd                 Cmd
+		run                 bool
+		expectPipeOutputErr bool
 	}{
 		{
-			cmd: Command(zap.NewNop(), "echo", "Hello", "World"),
+			name: "nominal behavior",
+			cmd:  Command(zap.NewExample(), "echo", "Hello", "World"),
+			run:  true,
 		},
 		{
+			name: "no debug, no pipe",
+			cmd:  Command(zap.NewNop(), "echo", "Hello", "World"),
+		},
+		{
+			name: "stdout already piped",
 			cmd: func() Cmd {
 				cmd := Command(zap.NewExample(), "echo", "Hello", "World")
+
 				_, err := cmd.process.StdoutPipe()
-
 				if err != nil {
-					t.Fatalf("expected no error but got: %v", err)
+					t.Fatalf("expected no error from cmd.process.StdoutPipe(), but got: %v", err)
 				}
 
 				return cmd
 			}(),
-			expectErr: true,
+			expectPipeOutputErr: true,
 		},
 		{
+			name: "stderr already piped",
 			cmd: func() Cmd {
 				cmd := Command(zap.NewExample(), "echo", "Hello", "World")
-				_, err := cmd.process.StderrPipe()
 
+				_, err := cmd.process.StderrPipe()
 				if err != nil {
-					t.Fatalf("expected no error but got: %v", err)
+					t.Fatalf("expected no error from cmd.process.StderrPipe(), but got: %v", err)
 				}
 
 				return cmd
 			}(),
-			expectErr: true,
+			expectPipeOutputErr: true,
 		},
-		{
-			cmd: Command(zap.NewExample(), "echo", "Hello", "World"),
-			run: true,
-		},
-	} {
-		err := tc.cmd.pipeOutput()
+	}
 
-		if tc.run {
-			errStart := tc.cmd.process.Start()
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.cmd.pipeOutput()
 
-			if errStart != nil {
-				t.Fatalf("test %d: expected no error but got: %v", i, err)
+			if tc.run {
+				errStart := tc.cmd.process.Start()
+				if errStart != nil {
+					t.Fatalf("expected no error from tc.cmd.process.Start(), but got: %v", errStart)
+				}
 			}
-		}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+			if tc.expectPipeOutputErr && err == nil {
+				t.Error("expected error from cmd.pipeOutput(), but got none")
+			}
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if !tc.expectPipeOutputErr && err != nil {
+				t.Errorf("expected no error from cmd.pipeOutput(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestCmd_Kill(t *testing.T) {
-	for i, tc := range []struct {
-		cmd       Cmd
-		expectErr bool
+	tests := []struct {
+		name string
+		cmd  Cmd
 	}{
 		{
-			cmd: Cmd{logger: zap.NewNop()},
-		},
-		{
+			name: "nominal behavior",
 			cmd: func() Cmd {
 				cmd := Command(zap.NewNop(), "sleep", "60")
-				err := cmd.process.Start()
 
+				err := cmd.process.Start()
 				if err != nil {
-					t.Fatalf("expected no error but got: %v", err)
+					t.Fatalf("expected no error from cmd.process.Start(), but got: %v", err)
 				}
 
 				return cmd
 			}(),
 		},
 		{
+			name: "no process",
+			cmd:  Cmd{logger: zap.NewNop()},
+		},
+		{
+			name: "process already killed",
 			cmd: func() Cmd {
-				cmd := Command(zap.NewNop(), "echo", "Hello", "World")
-				err := cmd.process.Run()
+				cmd := Command(zap.NewNop(), "sleep", "60")
 
+				err := cmd.process.Start()
 				if err != nil {
-					t.Fatalf("expected no error but got: %v", err)
+					t.Fatalf("expected no error from cmd.process.Start(), but got: %v", err)
+				}
+
+				err = cmd.Kill()
+				if err != nil {
+					t.Fatalf("expected no error from cmd.Kill(), but got: %v", err)
 				}
 
 				return cmd
 			}(),
 		},
-	} {
-		err := tc.cmd.Kill()
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
-
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.cmd.Kill()
+			if err != nil {
+				t.Errorf("expected no error from cmd.Kill(), but got: %v", err)
+			}
+		})
 	}
 }

pkg/gotenberg/mocks.go

@@ -0,0 +1,66 @@
+package gotenberg
+
+import (
+	"context"
+
+	"go.uber.org/zap"
+)
+
+// ModuleMock is a mock for the Module interface.
+type ModuleMock struct {
+	DescriptorMock func() ModuleDescriptor
+}
+
+func (mod ModuleMock) Descriptor() ModuleDescriptor {
+	return mod.DescriptorMock()
+}
+
+// ValidatorMock is a mock for the Validator interface.
+type ValidatorMock struct {
+	ValidateMock func() error
+}
+
+func (mod ValidatorMock) Validate() error {
+	return mod.ValidateMock()
+}
+
+// PDFEngineMock is a mock for the PDFEngine interface.
+type PDFEngineMock struct {
+	MergeMock   func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error
+	ConvertMock func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error
+}
+
+func (engine PDFEngineMock) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+	return engine.MergeMock(ctx, logger, inputPaths, outputPath)
+}
+
+func (engine PDFEngineMock) Convert(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+	return engine.ConvertMock(ctx, logger, format, inputPath, outputPath)
+}
+
+// PDFEngineProviderMock is a mock for the PDFEngineProvider interface.
+type PDFEngineProviderMock struct {
+	PDFEngineMock func() (PDFEngine, error)
+}
+
+func (provider PDFEngineProviderMock) PDFEngine() (PDFEngine, error) {
+	return provider.PDFEngineMock()
+}
+
+// LoggerProviderMock is a mock for the LoggerProvider interface.
+type LoggerProviderMock struct {
+	LoggerMock func(mod Module) (*zap.Logger, error)
+}
+
+func (provider LoggerProviderMock) Logger(mod Module) (*zap.Logger, error) {
+	return provider.LoggerMock(mod)
+}
+
+// Interface guards.
+var (
+	_ Module            = (*ModuleMock)(nil)
+	_ Validator         = (*ValidatorMock)(nil)
+	_ PDFEngine         = (*PDFEngineMock)(nil)
+	_ PDFEngineProvider = (*PDFEngineProviderMock)(nil)
+	_ LoggerProvider    = (*LoggerProviderMock)(nil)
+)

pkg/gotenberg/mocks_test.go

@@ -0,0 +1,82 @@
+package gotenberg
+
+import (
+	"context"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+func TestModuleMock(t *testing.T) {
+	mock := ModuleMock{
+		DescriptorMock: func() ModuleDescriptor {
+			return ModuleDescriptor{ID: "foo", New: func() Module {
+				return nil
+			}}
+		},
+	}
+
+	if mock.Descriptor().ID != "foo" {
+		t.Errorf("expected ID '%s' from mock.Descriptor(), but got '%s'", "foo", mock.Descriptor().ID)
+	}
+}
+
+func TestValidatorMock(t *testing.T) {
+	mock := ValidatorMock{
+		ValidateMock: func() error {
+			return nil
+		},
+	}
+
+	err := mock.Validate()
+	if err != nil {
+		t.Errorf("expected no error from mock.Validate(), but got: %v", err)
+	}
+}
+
+func TestPDFEngineMock(t *testing.T) {
+	mock := PDFEngineMock{
+		MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+			return nil
+		},
+		ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+			return nil
+		},
+	}
+
+	err := mock.Merge(context.Background(), zap.NewNop(), nil, "")
+	if err != nil {
+		t.Errorf("expected no error from mock.Merge(), but got: %v", err)
+	}
+
+	err = mock.Convert(context.Background(), zap.NewNop(), "", "", "")
+	if err != nil {
+		t.Errorf("expected no error from mock.Convert(), but got: %v", err)
+	}
+}
+
+func TestPDFEngineProvider(t *testing.T) {
+	mock := PDFEngineProviderMock{
+		PDFEngineMock: func() (PDFEngine, error) {
+			return PDFEngineMock{}, nil
+		},
+	}
+
+	_, err := mock.PDFEngine()
+	if err != nil {
+		t.Errorf("expected no error from mock.PDFEngine(), but got: %v", err)
+	}
+}
+
+func TestLoggerProviderMock(t *testing.T) {
+	mock := LoggerProviderMock{
+		LoggerMock: func(mod Module) (*zap.Logger, error) {
+			return nil, nil
+		},
+	}
+
+	_, err := mock.Logger(ModuleMock{})
+	if err != nil {
+		t.Errorf("expected no error from mock.Logger(), but got: %v", err)
+	}
+}

pkg/modules/api/context.go

@@ -277,6 +277,8 @@ func (ctx Context) OutputFilename(outputPath string) string {
 	return fmt.Sprintf("%s%s", filename, filepath.Ext(outputPath))
 }
 
+// TODO: move MockContext to mocks.go (and rename it ContextMock).
+
 // MockContext is a helper for tests.
 //
 //  ctx := &api.MockContext{Context: &api.Context{}}

pkg/modules/libreoffice/doc.go

@@ -1,3 +1,3 @@
 // Package libreoffice provides a module which adds a route for converting
-// document to PDF with LibreOffice.
+// documents to PDF with LibreOffice.
 package libreoffice

pkg/modules/libreoffice/libreoffice.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
 	"github.com/gotenberg/gotenberg/v7/pkg/modules/api"
-	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 	flag "github.com/spf13/pflag"
 )
 
@@ -16,7 +16,7 @@ func init() {
 // LibreOffice is a module which provides a route for converting documents to
 // PDF with LibreOffice.
 type LibreOffice struct {
-	unoconv       unoconv.API
+	unoAPI        uno.API
 	engine        gotenberg.PDFEngine
 	disableRoutes bool
 }
@@ -40,17 +40,17 @@ func (mod *LibreOffice) Provision(ctx *gotenberg.Context) error {
 	flags := ctx.ParsedFlags()
 	mod.disableRoutes = flags.MustBool("libreoffice-disable-routes")
 
-	provider, err := ctx.Module(new(unoconv.Provider))
+	provider, err := ctx.Module(new(uno.Provider))
 	if err != nil {
-		return fmt.Errorf("get unoconv provider: %w", err)
+		return fmt.Errorf("get unoAPI provider: %w", err)
 	}
 
-	uno, err := provider.(unoconv.Provider).Unoconv()
+	unoAPI, err := provider.(uno.Provider).UNO()
 	if err != nil {
-		return fmt.Errorf("get unoconv API: %w", err)
+		return fmt.Errorf("get unoAPI API: %w", err)
 	}
 
-	mod.unoconv = uno
+	mod.unoAPI = unoAPI
 
 	provider, err = ctx.Module(new(gotenberg.PDFEngineProvider))
 	if err != nil {
@@ -74,7 +74,7 @@ func (mod LibreOffice) Routes() ([]api.Route, error) {
 	}
 
 	return []api.Route{
-		convertRoute(mod.unoconv, mod.engine),
+		convertRoute(mod.unoAPI, mod.engine),
 	}, nil
 }
 

pkg/modules/libreoffice/libreoffice_test.go

@@ -1,68 +1,14 @@
 package libreoffice
 
 import (
-	"context"
 	"errors"
 	"reflect"
 	"testing"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
-	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
-	"go.uber.org/zap"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 )
 
-type ProtoModule struct {
-	descriptor func() gotenberg.ModuleDescriptor
-}
-
-func (mod ProtoModule) Descriptor() gotenberg.ModuleDescriptor {
-	return mod.descriptor()
-}
-
-type ProtoUnoconvProvider struct {
-	ProtoModule
-	unoconv func() (unoconv.API, error)
-}
-
-func (mod ProtoUnoconvProvider) Unoconv() (unoconv.API, error) {
-	return mod.unoconv()
-}
-
-type ProtoUnoconvAPI struct {
-	pdf        func(_ context.Context, _ *zap.Logger, _, _ string, _ unoconv.Options) error
-	extensions func() []string
-}
-
-func (mod ProtoUnoconvAPI) PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options unoconv.Options) error {
-	return mod.pdf(ctx, logger, inputPath, outputPath, options)
-}
-
-func (mod ProtoUnoconvAPI) Extensions() []string {
-	return mod.extensions()
-}
-
-type ProtoPDFEngineProvider struct {
-	ProtoModule
-	pdfEngine func() (gotenberg.PDFEngine, error)
-}
-
-func (mod ProtoPDFEngineProvider) PDFEngine() (gotenberg.PDFEngine, error) {
-	return mod.pdfEngine()
-}
-
-type ProtoPDFEngine struct {
-	merge   func(_ context.Context, _ *zap.Logger, _ []string, _ string) error
-	convert func(_ context.Context, _ *zap.Logger, _, _, _ string) error
-}
-
-func (mod ProtoPDFEngine) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
-	return mod.merge(ctx, logger, inputPaths, outputPath)
-}
-
-func (mod ProtoPDFEngine) Convert(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
-	return mod.convert(ctx, logger, format, inputPath, outputPath)
-}
-
 func TestLibreOffice_Descriptor(t *testing.T) {
 	descriptor := LibreOffice{}.Descriptor()
 
@@ -75,15 +21,38 @@ func TestLibreOffice_Descriptor(t *testing.T) {
 }
 
 func TestLibreOffice_Provision(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       *gotenberg.Context
-		expectErr bool
+	tests := []struct {
+		name               string
+		ctx                *gotenberg.Context
+		expectProvisionErr bool
 	}{
 		{
+			name: "nominal behavior",
 			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoModule }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
+				provider1 := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider1.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider1
+					}}
+				}
+				provider1.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, nil
+				}
+
+				provider2 := struct {
+					gotenberg.ModuleMock
+					gotenberg.PDFEngineProviderMock
+				}{}
+				provider2.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module {
+						return provider2
+					}}
+				}
+				provider2.PDFEngineMock = func() (gotenberg.PDFEngine, error) {
+					return gotenberg.PDFEngineMock{}, nil
 				}
 
 				return gotenberg.NewContext(
@@ -91,41 +60,36 @@ func TestLibreOffice_Provision(t *testing.T) {
 						FlagSet: new(LibreOffice).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
+						provider1.Descriptor(),
+						provider2.Descriptor(),
 					},
 				)
 			}(),
-			expectErr: true,
 		},
 		{
-			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoUnoconvProvider }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
-				}
-				mod.unoconv = func() (unoconv.API, error) {
-					return nil, errors.New("foo")
-				}
-
-				return gotenberg.NewContext(
-					gotenberg.ParsedFlags{
-						FlagSet: new(LibreOffice).Descriptor().FlagSet,
-					},
-					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
-					},
-				)
-			}(),
-			expectErr: true,
+			name: "no UNO API provider",
+			ctx: gotenberg.NewContext(
+				gotenberg.ParsedFlags{
+					FlagSet: new(LibreOffice).Descriptor().FlagSet,
+				},
+				[]gotenberg.ModuleDescriptor{},
+			),
+			expectProvisionErr: true,
 		},
 		{
+			name: "no API from UNO API provider",
 			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoUnoconvProvider }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
+				provider := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
 				}
-				mod.unoconv = func() (unoconv.API, error) {
-					return struct{ ProtoUnoconvAPI }{}, nil
+				provider.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, errors.New("foo")
 				}
 
 				return gotenberg.NewContext(
@@ -133,28 +97,26 @@ func TestLibreOffice_Provision(t *testing.T) {
 						FlagSet: new(LibreOffice).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
+						provider.Descriptor(),
 					},
 				)
 			}(),
-			expectErr: true,
+			expectProvisionErr: true,
 		},
 		{
+			name: "no PDF engine provider",
 			ctx: func() *gotenberg.Context {
-				mod1 := struct{ ProtoUnoconvProvider }{}
-				mod1.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod1 }}
+				provider := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
 				}
-				mod1.unoconv = func() (unoconv.API, error) {
-					return struct{ ProtoUnoconvAPI }{}, nil
-				}
-
-				mod2 := struct{ ProtoPDFEngineProvider }{}
-				mod2.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return mod2 }}
-				}
-				mod2.pdfEngine = func() (gotenberg.PDFEngine, error) {
-					return nil, errors.New("foo")
+				provider.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, nil
 				}
 
 				return gotenberg.NewContext(
@@ -162,29 +124,39 @@ func TestLibreOffice_Provision(t *testing.T) {
 						FlagSet: new(LibreOffice).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod1.Descriptor(),
-						mod2.Descriptor(),
+						provider.Descriptor(),
 					},
 				)
 			}(),
-			expectErr: true,
+			expectProvisionErr: true,
 		},
 		{
+			name: "no PDF engine from PDF engine provider",
 			ctx: func() *gotenberg.Context {
-				mod1 := struct{ ProtoUnoconvProvider }{}
-				mod1.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod1 }}
+				provider1 := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider1.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider1
+					}}
 				}
-				mod1.unoconv = func() (unoconv.API, error) {
-					return struct{ ProtoUnoconvAPI }{}, nil
+				provider1.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, nil
 				}
 
-				mod2 := struct{ ProtoPDFEngineProvider }{}
-				mod2.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return mod2 }}
+				provider2 := struct {
+					gotenberg.ModuleMock
+					gotenberg.PDFEngineProviderMock
+				}{}
+				provider2.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module {
+						return provider2
+					}}
 				}
-				mod2.pdfEngine = func() (gotenberg.PDFEngine, error) {
-					return struct{ ProtoPDFEngine }{}, nil
+				provider2.PDFEngineMock = func() (gotenberg.PDFEngine, error) {
+					return gotenberg.PDFEngineMock{}, errors.New("foo")
 				}
 
 				return gotenberg.NewContext(
@@ -192,59 +164,60 @@ func TestLibreOffice_Provision(t *testing.T) {
 						FlagSet: new(LibreOffice).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod1.Descriptor(),
-						mod2.Descriptor(),
+						provider1.Descriptor(),
+						provider2.Descriptor(),
 					},
 				)
 			}(),
+			expectProvisionErr: true,
 		},
-	} {
-		mod := new(LibreOffice)
-		err := mod.Provision(tc.ctx)
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := new(LibreOffice)
+			err := mod.Provision(tc.ctx)
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectProvisionErr && err == nil {
+				t.Error("expected mod.Provision() error, but got none")
+			}
+
+			if !tc.expectProvisionErr && err != nil {
+				t.Errorf("expected no error from mod.Provision(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestLibreOffice_Routes(t *testing.T) {
-	for i, tc := range []struct {
-		expectRoutes  int
-		disableRoutes bool
+	tests := []struct {
+		name              string
+		mod               LibreOffice
+		expectRoutesCount int
 	}{
 		{
-			expectRoutes: 1,
+			name:              "route not disabled",
+			mod:               LibreOffice{},
+			expectRoutesCount: 1,
 		},
 		{
-			disableRoutes: true,
+			name: "route disabled",
+			mod: LibreOffice{
+				disableRoutes: true,
+			},
 		},
-	} {
-		mod := new(LibreOffice)
-		mod.disableRoutes = tc.disableRoutes
+	}
 
-		routes, err := mod.Routes()
-		if err != nil {
-			t.Fatalf("test %d: expected no error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			routes, err := tc.mod.Routes()
+			if err != nil {
+				t.Fatalf("expected no error from mod.Routes(), but got: %v", err)
+			}
 
-		if tc.expectRoutes != len(routes) {
-			t.Errorf("test %d: expected %d routes but got %d", i, tc.expectRoutes, len(routes))
-		}
+			if tc.expectRoutesCount != len(routes) {
+				t.Errorf("expected %d routes from mod.Routes(), but got %d", tc.expectRoutesCount, len(routes))
+			}
+		})
 	}
 }
-
-// Interface guards.
-var (
-	_ gotenberg.Module            = (*ProtoModule)(nil)
-	_ unoconv.Provider            = (*ProtoUnoconvProvider)(nil)
-	_ gotenberg.Module            = (*ProtoUnoconvProvider)(nil)
-	_ unoconv.API                 = (*ProtoUnoconvAPI)(nil)
-	_ gotenberg.PDFEngineProvider = (*ProtoPDFEngineProvider)(nil)
-	_ gotenberg.Module            = (*ProtoPDFEngineProvider)(nil)
-	_ gotenberg.PDFEngine         = (*ProtoPDFEngine)(nil)
-)

pkg/modules/libreoffice/pdfengine/doc.go

@@ -1,3 +1,4 @@
-// Package pdfengine provides a module which abstracts the CLI tool unoconv and
-// implements the gotenberg.PDFEngine interface.
+// Package pdfengine provides a module which interacts with the UNO
+// (Universal Network Objects) API and implements the gotenberg.PDFEngine
+// interface.
 package pdfengine

pkg/modules/libreoffice/pdfengine/pdfengine.go

@@ -2,75 +2,76 @@ package pdfengine
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
-	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 	"go.uber.org/zap"
 )
 
 func init() {
-	gotenberg.MustRegisterModule(UnoconvPDFEngine{})
+	gotenberg.MustRegisterModule(UNO{})
 }
 
-// UnoconvPDFEngine abstracts the CLI tool unoconv and implements the
-// gotenberg.PDFEngine interface.
-type UnoconvPDFEngine struct {
-	unoconv unoconv.API
+// UNO interacts with the UNO (Universal Network Objects) API and implements
+// the gotenberg.PDFEngine interface.
+type UNO struct {
+	unoAPI uno.API
 }
 
-// Descriptor returns a UnoconvPDFEngine's module descriptor.
-func (UnoconvPDFEngine) Descriptor() gotenberg.ModuleDescriptor {
+// Descriptor returns a UNO's module descriptor.
+func (UNO) Descriptor() gotenberg.ModuleDescriptor {
 	return gotenberg.ModuleDescriptor{
-		ID:  "unoconv-pdfengine",
-		New: func() gotenberg.Module { return new(UnoconvPDFEngine) },
+		ID:  "uno-pdfengine",
+		New: func() gotenberg.Module { return new(UNO) },
 	}
 }
 
 // Provision sets the module properties.
-func (engine *UnoconvPDFEngine) Provision(ctx *gotenberg.Context) error {
-	provider, err := ctx.Module(new(unoconv.Provider))
+func (engine *UNO) Provision(ctx *gotenberg.Context) error {
+	provider, err := ctx.Module(new(uno.Provider))
 	if err != nil {
 		return fmt.Errorf("get unoconv provider: %w", err)
 	}
 
-	uno, err := provider.(unoconv.Provider).Unoconv()
+	unoAPI, err := provider.(uno.Provider).UNO()
 	if err != nil {
 		return fmt.Errorf("get unoconv API: %w", err)
 	}
 
-	engine.unoconv = uno
+	engine.unoAPI = unoAPI
 
 	return nil
 }
 
 // Merge is not available for this PDF engine.
-func (engine UnoconvPDFEngine) Merge(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
+func (engine UNO) Merge(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
 	return fmt.Errorf("merge PDFs with unoconv: %w", gotenberg.ErrPDFEngineMethodNotAvailable)
 }
 
 // Convert converts the given PDF to a specific PDF format. Currently, only the
-// PDF/A-1 format is available. If another PDF format is requested, it returns
-// a gotenberg.ErrPDFFormatNotAvailable error.
-func (engine UnoconvPDFEngine) Convert(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
-	if format != gotenberg.FormatPDFA1a {
-		return fmt.Errorf("convert PDF to '%s' with unoconv: %w", format, gotenberg.ErrPDFFormatNotAvailable)
-	}
-
-	err := engine.unoconv.PDF(ctx, logger, inputPath, outputPath, unoconv.Options{
-		PDFArchive: true,
+// PDF/A-1a, PDF/A-2b and PDF/A-3b formats are available. If another PDF format
+// is requested, it returns a gotenberg.ErrPDFFormatNotAvailable error.
+func (engine UNO) Convert(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+	err := engine.unoAPI.PDF(ctx, logger, inputPath, outputPath, uno.Options{
+		PDFformat: format,
 	})
 
 	if err == nil {
 		return nil
 	}
 
+	if errors.Is(err, uno.ErrInvalidPDFformat) {
+		return fmt.Errorf("convert PDF to '%s' with unoconv: %w", format, gotenberg.ErrPDFFormatNotAvailable)
+	}
+
 	return fmt.Errorf("convert PDF to '%s' with unoconv: %w", format, err)
 }
 
 // Interface guards.
 var (
-	_ gotenberg.Module      = (*UnoconvPDFEngine)(nil)
-	_ gotenberg.Provisioner = (*UnoconvPDFEngine)(nil)
-	_ gotenberg.PDFEngine   = (*UnoconvPDFEngine)(nil)
+	_ gotenberg.Module      = (*UNO)(nil)
+	_ gotenberg.Provisioner = (*UNO)(nil)
+	_ gotenberg.PDFEngine   = (*UNO)(nil)
 )

pkg/modules/libreoffice/pdfengine/pdfengine_test.go

@@ -7,191 +7,168 @@ import (
 	"testing"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
-	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
-	flag "github.com/spf13/pflag"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 	"go.uber.org/zap"
 )
 
-type ProtoModule struct {
-	descriptor func() gotenberg.ModuleDescriptor
-}
-
-func (mod ProtoModule) Descriptor() gotenberg.ModuleDescriptor {
-	return mod.descriptor()
-}
-
-type ProtoUnoconvProvider struct {
-	ProtoModule
-	unoconv func() (unoconv.API, error)
-}
-
-func (mod ProtoUnoconvProvider) Unoconv() (unoconv.API, error) {
-	return mod.unoconv()
-}
-
-type ProtoUnoconvAPI struct {
-	pdf func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options unoconv.Options) error
-}
-
-func (mod ProtoUnoconvAPI) PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options unoconv.Options) error {
-	return mod.pdf(ctx, logger, inputPath, outputPath, options)
-}
-
-func (mod ProtoUnoconvAPI) Extensions() []string {
-	return nil
-}
-
-func TestUnoconvPDFEngine_Descriptor(t *testing.T) {
-	descriptor := UnoconvPDFEngine{}.Descriptor()
+func TestUNO_Descriptor(t *testing.T) {
+	descriptor := UNO{}.Descriptor()
 
 	actual := reflect.TypeOf(descriptor.New())
-	expect := reflect.TypeOf(new(UnoconvPDFEngine))
+	expect := reflect.TypeOf(new(UNO))
 
 	if actual != expect {
 		t.Errorf("expected '%s' but got '%s'", expect, actual)
 	}
 }
 
-func TestUnoconvPDFEngine_Provision(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       *gotenberg.Context
-		expectErr bool
+func TestUNO_Provider(t *testing.T) {
+	tests := []struct {
+		name               string
+		ctx                *gotenberg.Context
+		expectProvisionErr bool
 	}{
 		{
+			name: "nominal behavior",
 			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoModule }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
+				provider := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, nil
 				}
 
 				return gotenberg.NewContext(
 					gotenberg.ParsedFlags{
-						FlagSet: flag.NewFlagSet("foo", flag.ExitOnError),
+						FlagSet: new(UNO).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
+						provider.Descriptor(),
 					},
 				)
 			}(),
-			expectErr: true,
 		},
 		{
-			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoUnoconvProvider }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
-				}
-				mod.unoconv = func() (unoconv.API, error) {
-					return nil, errors.New("foo")
-				}
-
-				return gotenberg.NewContext(
-					gotenberg.ParsedFlags{
-						FlagSet: flag.NewFlagSet("foo", flag.ExitOnError),
-					},
-					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
-					},
-				)
-			}(),
-			expectErr: true,
+			name: "no UNO API provider",
+			ctx: gotenberg.NewContext(
+				gotenberg.ParsedFlags{
+					FlagSet: new(UNO).Descriptor().FlagSet,
+				},
+				[]gotenberg.ModuleDescriptor{},
+			),
+			expectProvisionErr: true,
 		},
 		{
+			name: "no API from UNO API provider",
 			ctx: func() *gotenberg.Context {
-				mod := struct{ ProtoUnoconvProvider }{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
+				provider := struct {
+					gotenberg.ModuleMock
+					uno.ProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
 				}
-				mod.unoconv = func() (unoconv.API, error) {
-					return struct{ ProtoUnoconvAPI }{}, nil
+				provider.UNOMock = func() (uno.API, error) {
+					return uno.APIMock{}, errors.New("foo")
 				}
 
 				return gotenberg.NewContext(
 					gotenberg.ParsedFlags{
-						FlagSet: flag.NewFlagSet("foo", flag.ExitOnError),
+						FlagSet: new(UNO).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
+						provider.Descriptor(),
 					},
 				)
 			}(),
+			expectProvisionErr: true,
 		},
-	} {
-		mod := new(UnoconvPDFEngine)
-		err := mod.Provision(tc.ctx)
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := new(UNO)
+			err := mod.Provision(tc.ctx)
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectProvisionErr && err == nil {
+				t.Error("expected mod.Provision() error, but got none")
+			}
+
+			if !tc.expectProvisionErr && err != nil {
+				t.Errorf("expected no error from mod.Provision(), but got: %v", err)
+			}
+		})
 	}
 }
 
-func TestUnoconvPDFEngine_Merge(t *testing.T) {
-	mod := new(UnoconvPDFEngine)
-	err := mod.Merge(context.TODO(), zap.NewNop(), nil, "")
+func TestUNO_Merge(t *testing.T) {
+	mod := new(UNO)
+	err := mod.Merge(context.Background(), zap.NewNop(), nil, "")
 
 	if !errors.Is(err, gotenberg.ErrPDFEngineMethodNotAvailable) {
-		t.Errorf("expected error %v, but got: %v", gotenberg.ErrPDFEngineMethodNotAvailable, err)
+		t.Errorf("expected error %v from mod.Merge(), but got: %v", gotenberg.ErrPDFEngineMethodNotAvailable, err)
 	}
 }
 
-func TestUnoconvPDFEngine_Convert(t *testing.T) {
-	for i, tc := range []struct {
-		api       unoconv.API
-		format    string
-		expectErr bool
+func TestUNO_Convert(t *testing.T) {
+	tests := []struct {
+		name             string
+		mod              UNO
+		expectConvertErr bool
 	}{
 		{
-			format:    "",
-			expectErr: true,
+			name: "nominal behavior",
+			mod: UNO{
+				unoAPI: uno.APIMock{
+					PDFMock: func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options uno.Options) error {
+						return nil
+					},
+				},
+			},
 		},
 		{
-			api: func() unoconv.API {
-				unoconvAPI := struct{ ProtoUnoconvAPI }{}
-				unoconvAPI.pdf = func(_ context.Context, _ *zap.Logger, _, __ string, _ unoconv.Options) error {
-					return errors.New("foo")
-				}
-
-				return unoconvAPI
-			}(),
-			format:    gotenberg.FormatPDFA1a,
-			expectErr: true,
+			name: "invalid PDF format",
+			mod: UNO{
+				unoAPI: uno.APIMock{
+					PDFMock: func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options uno.Options) error {
+						return uno.ErrInvalidPDFformat
+					},
+				},
+			},
+			expectConvertErr: true,
 		},
 		{
-			api: func() unoconv.API {
-				unoconvAPI := struct{ ProtoUnoconvAPI }{}
-				unoconvAPI.pdf = func(_ context.Context, _ *zap.Logger, _, __ string, _ unoconv.Options) error {
-					return nil
-				}
-
-				return unoconvAPI
-			}(),
-			format: gotenberg.FormatPDFA1a,
+			name: "convert fail",
+			mod: UNO{
+				unoAPI: uno.APIMock{
+					PDFMock: func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options uno.Options) error {
+						return errors.New("foo")
+					},
+				},
+			},
+			expectConvertErr: true,
 		},
-	} {
-		mod := new(UnoconvPDFEngine)
-		mod.unoconv = tc.api
+	}
 
-		err := mod.Convert(context.TODO(), zap.NewNop(), tc.format, "", "")
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.mod.Convert(context.Background(), zap.NewNop(), "", "", "")
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+			if tc.expectConvertErr && err == nil {
+				t.Errorf("expected mod.Convert() error, but got none")
+			}
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if !tc.expectConvertErr && err != nil {
+				t.Fatalf("expected no error from mod.Convert(), but got: %v", err)
+			}
+		})
 	}
 }
-
-// Interface guards.
-var (
-	_ gotenberg.Module = (*ProtoModule)(nil)
-	_ unoconv.Provider = (*ProtoUnoconvProvider)(nil)
-	_ gotenberg.Module = (*ProtoUnoconvProvider)(nil)
-	_ unoconv.API      = (*ProtoUnoconvAPI)(nil)
-)

pkg/modules/libreoffice/routes.go

@@ -7,13 +7,13 @@ import (
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
 	"github.com/gotenberg/gotenberg/v7/pkg/modules/api"
-	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 	"github.com/labstack/echo/v4"
 )
 
 // convertRoute returns an api.Route which can convert LibreOffice documents
 // to PDF.
-func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
+func convertRoute(unoAPI uno.API, engine gotenberg.PDFEngine) api.Route {
 	return api.Route{
 		Method:      http.MethodPost,
 		Path:        "/forms/libreoffice/convert",
@@ -27,15 +27,17 @@ func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
 				landscape          bool
 				nativePageRanges   string
 				nativePDFA1aFormat bool
+				nativePDFformat    string
 				PDFformat          string
 				merge              bool
 			)
 
 			err := ctx.FormData().
-				MandatoryPaths(uno.Extensions(), &inputPaths).
+				MandatoryPaths(unoAPI.Extensions(), &inputPaths).
 				Bool("landscape", &landscape, false).
 				String("nativePageRanges", &nativePageRanges, "").
 				Bool("nativePdfA1aFormat", &nativePDFA1aFormat, false).
+				String("nativePdfFormat", &nativePDFformat, "").
 				String("pdfFormat", &PDFformat, "").
 				Bool("merge", &merge, false).
 				Validate()
@@ -44,13 +46,35 @@ func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
 				return fmt.Errorf("validate form data: %w", err)
 			}
 
+			if nativePDFA1aFormat {
+				ctx.Log().Warn("'nativePdfA1aFormat' is deprecated; prefer 'nativePdfFormat' or 'pdfFormat' form fields instead")
+			}
+
+			if nativePDFA1aFormat && nativePDFformat != "" {
+				return api.WrapError(
+					errors.New("got both 'nativePdfFormat' and 'nativePdfA1aFormat' form fields"),
+					api.NewSentinelHTTPError(http.StatusBadRequest, "Both 'nativePdfFormat' and 'nativePdfA1aFormat' form fields are provided"),
+				)
+			}
+
 			if nativePDFA1aFormat && PDFformat != "" {
 				return api.WrapError(
-					errors.New("got both 'pdfFormat' and 'nativePdfA1aFormat' form values"),
-					api.NewSentinelHTTPError(http.StatusBadRequest, "Both 'pdfFormat' and 'nativePdfA1aFormat' form values are provided"),
+					errors.New("got both 'pdfFormat' and 'nativePdfA1aFormat' form fields"),
+					api.NewSentinelHTTPError(http.StatusBadRequest, "Both 'pdfFormat' and 'nativePdfA1aFormat' form fields are provided"),
 				)
 			}
 
+			if nativePDFformat != "" && PDFformat != "" {
+				return api.WrapError(
+					errors.New("got both 'pdfFormat' and 'nativePdfFormat' form fields"),
+					api.NewSentinelHTTPError(http.StatusBadRequest, "Both 'pdfFormat' and 'nativePdfFormat' form fields are provided"),
+				)
+			}
+
+			if nativePDFA1aFormat {
+				nativePDFformat = gotenberg.FormatPDFA1a
+			}
+
 			// Alright, let's convert each document to PDF.
 
 			outputPaths := make([]string, len(inputPaths))
@@ -58,16 +82,16 @@ func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
 			for i, inputPath := range inputPaths {
 				outputPaths[i] = ctx.GeneratePath(".pdf")
 
-				options := unoconv.Options{
+				options := uno.Options{
 					Landscape:  landscape,
 					PageRanges: nativePageRanges,
-					PDFArchive: nativePDFA1aFormat,
+					PDFformat:  nativePDFformat,
 				}
 
-				err = uno.PDF(ctx, ctx.Log(), inputPath, outputPaths[i], options)
+				err = unoAPI.PDF(ctx, ctx.Log(), inputPath, outputPaths[i], options)
 
 				if err != nil {
-					if errors.Is(err, unoconv.ErrMalformedPageRanges) {
+					if errors.Is(err, uno.ErrMalformedPageRanges) {
 						return api.WrapError(
 							fmt.Errorf("convert to PDF: %w", err),
 							api.NewSentinelHTTPError(http.StatusBadRequest, fmt.Sprintf("Malformed page ranges '%s' (nativePageRanges)", options.PageRanges)),
@@ -92,10 +116,8 @@ func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
 				// Now, let's check if the client want to convert this result
 				// PDF to a specific PDF format.
 
-				// Note: nativePdfA1aFormat has not been specified if we reach
-				// this part of the code. Indeed, the handler returns early on
-				// an error if both nativePdfA1aFormat and pdfFormat are
-				// present.
+				// Note: nativePdfA1aFormat/nativePdfFormat have not been
+				// specified if PDFformat is not empty.
 
 				if PDFformat != "" {
 					convertInputPath := outputPath
@@ -135,9 +157,8 @@ func convertRoute(uno unoconv.API, engine gotenberg.PDFEngine) api.Route {
 			// Ok, we don't have to merge the PDFs. Let's check if the client
 			// want to convert each PDF to a specific PDF format.
 
-			// Note: nativePdfA1aFormat has not been specified if we reach this
-			// part of the code. Indeed, the handler returns early on an error
-			// if both nativePdfA1aFormat and pdfFormat are present.
+			// Note: nativePdfA1aFormat/nativePdfFormat have not been
+			// specified if PDFformat is not empty.
 
 			if PDFformat != "" {
 				convertOutputPaths := make([]string, len(outputPaths))

pkg/modules/libreoffice/uno/doc.go

@@ -0,0 +1,3 @@
+// Package uno provides a module which interacts with the UNO
+// (Universal Network Objects) API.
+package uno

pkg/modules/libreoffice/uno/freeport.go

@@ -1,4 +1,4 @@
-package unoconv
+package uno
 
 import (
 	"fmt"
@@ -9,18 +9,18 @@ import (
 )
 
 func freePort(logger *zap.Logger) (int, error) {
-	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	netListener, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
 		return 0, fmt.Errorf("listen on the local network address: %w", err)
 	}
 	defer func() {
-		err := listener.Close()
+		err := netListener.Close()
 		if err != nil {
-			logger.Error(fmt.Sprintf("close listener: %s", err.Error()))
+			logger.Error(fmt.Sprintf("close network listener: %s", err.Error()))
 		}
 	}()
 
-	addr := listener.Addr().String()
+	addr := netListener.Addr().String()
 
 	_, portStr, err := net.SplitHostPort(addr)
 	if err != nil {

pkg/modules/libreoffice/uno/listener.go

@@ -0,0 +1,248 @@
+package uno
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
+	"go.uber.org/zap"
+)
+
+type listener interface {
+	start(logger *zap.Logger) error
+	stop(logger *zap.Logger) error
+	lock(ctx context.Context, logger *zap.Logger) error
+	unlock(logger *zap.Logger) error
+	port() int
+	queue() int
+	healthy() bool
+}
+
+type libreOfficeListener struct {
+	binPath      string
+	startTimeout time.Duration
+	threshold    int
+
+	socketPort         int
+	userProfileDirPath string
+	cmd                gotenberg.Cmd
+	cfgMu              sync.RWMutex
+
+	usage         int
+	queueLength   int
+	queueLengthMu sync.RWMutex
+	lockChan      chan struct{}
+	logger        *zap.Logger
+}
+
+func newLibreOfficeListener(logger *zap.Logger, binPath string, startTimeout time.Duration, threshold int) listener {
+	return &libreOfficeListener{
+		binPath:      binPath,
+		startTimeout: startTimeout,
+		threshold:    threshold,
+		lockChan:     make(chan struct{}, 1),
+		logger:       logger.Named("listener"),
+	}
+}
+
+func (listener *libreOfficeListener) start(logger *zap.Logger) error {
+	port, err := freePort(logger)
+	if err != nil {
+		return fmt.Errorf("get free port: %w", err)
+	}
+
+	// Good to know: when the supervisor manages the LibreOffice listener,
+	// the garbage collector might delete the next directory while it is
+	// still running. It does seem to cause any issue though.
+	userProfileDirPath := gotenberg.NewDirPath()
+
+	args := []string{
+		"--headless",
+		"--invisible",
+		"--nocrashreport",
+		"--nodefault",
+		"--nologo",
+		"--nofirststartwizard",
+		"--norestore",
+		fmt.Sprintf("-env:UserInstallation=file://%s", userProfileDirPath),
+		fmt.Sprintf("--accept=socket,host=127.0.0.1,port=%d,tcpNoDelay=1;urp;StarOffice.ComponentContext", port),
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), listener.startTimeout)
+	defer cancel()
+
+	cmd, err := gotenberg.CommandContext(ctx, logger, listener.binPath, args...)
+	if err != nil {
+		return fmt.Errorf("create LibreOffice listener command: %w", err)
+	}
+
+	// For whatever reason, LibreOffice requires a first start before being
+	// able to run as a daemon.
+	exitCode, err := cmd.Exec()
+	if err != nil && exitCode != 81 {
+		return fmt.Errorf("execute LibreOffice listener: %w", err)
+	}
+
+	logger.Debug("got exit code 81, e.g., LibreOffice listener first start")
+
+	// Second start (daemon).
+	cmd = gotenberg.Command(logger, listener.binPath, args...)
+
+	err = cmd.Start()
+	if err != nil {
+		return fmt.Errorf("start LibreOffice listener: %w", err)
+	}
+
+	// As the LibreOffice socket may take some time to be available, we have to
+	// ensure that it is indeed accepting connections.
+	logger.Debug("waiting for the LibreOffice listener socket to be available...")
+
+	for {
+		if ctx.Err() != nil {
+			return fmt.Errorf("waiting for the LibreOffice listener socket to be available: %w", ctx.Err())
+		}
+
+		_, err = net.DialTimeout("tcp", fmt.Sprintf("127.0.0.1:%d", port), time.Duration(1)*time.Second)
+		if err == nil {
+			break
+		}
+	}
+
+	logger.Debug("LibreOffice listener socket available")
+
+	listener.cfgMu.Lock()
+	listener.socketPort = port
+	listener.userProfileDirPath = userProfileDirPath
+	listener.cmd = cmd
+	listener.cfgMu.Unlock()
+
+	return nil
+}
+
+func (listener *libreOfficeListener) stop(logger *zap.Logger) error {
+	listener.cfgMu.RLock()
+
+	defer func() {
+		defer listener.cfgMu.RUnlock()
+
+		err := os.RemoveAll(listener.userProfileDirPath)
+		if err != nil {
+			logger.Error(fmt.Sprintf("remove LibreOffice listener user profile directory: %v", err))
+		}
+	}()
+
+	err := listener.cmd.Kill()
+	if err != nil {
+		return fmt.Errorf("kill LibreOffice listener process: %w", err)
+	}
+
+	// Let's wait to make sure the process is no more.
+	err = listener.cmd.Wait()
+	if err != nil {
+		logger.Debug(fmt.Sprintf("wait for the LibreOffice listener: %v", err))
+	}
+
+	return nil
+}
+
+func (listener *libreOfficeListener) lock(ctx context.Context, logger *zap.Logger) error {
+	listener.queueLengthMu.Lock()
+	listener.queueLength += 1
+	listener.queueLengthMu.Unlock()
+
+	select {
+	case listener.lockChan <- struct{}{}:
+		logger.Debug("LibreOffice listener lock acquired")
+
+		listener.queueLengthMu.Lock()
+		listener.queueLength -= 1
+		listener.queueLengthMu.Unlock()
+
+		return nil
+	case <-ctx.Done():
+		logger.Debug("failed to acquire LibreOffice listener lock before deadline")
+
+		listener.queueLengthMu.Lock()
+		listener.queueLength -= 1
+		listener.queueLengthMu.Unlock()
+
+		return fmt.Errorf("acquire LibreOffice listener lock: %w", ctx.Err())
+	}
+}
+
+func (listener *libreOfficeListener) unlock(logger *zap.Logger) error {
+	restart := func() error {
+		err := listener.stop(logger)
+		if err != nil {
+			return fmt.Errorf("stop LibreOffice listener: %w", err)
+		}
+
+		err = listener.start(logger)
+		if err != nil {
+			return fmt.Errorf("start LibreOffice listener: %w", err)
+		}
+
+		listener.usage = 0
+
+		return nil
+	}
+
+	defer func() {
+		<-listener.lockChan
+		logger.Debug("LibreOffice listener lock released")
+	}()
+
+	if !listener.healthy() {
+		logger.Debug("LibreOffice listener is unhealthy, restarting it...")
+
+		err := restart()
+		if err == nil {
+			return nil
+		}
+
+		return fmt.Errorf("restart LibreOffice listener: %w", err)
+	}
+
+	listener.usage += 1
+	if listener.usage < listener.threshold {
+		return nil
+	}
+
+	logger.Debug("LibreOffice listener threshold reached, restarting it...")
+
+	err := restart()
+	if err == nil {
+		return nil
+	}
+
+	return fmt.Errorf("restart LibreOffice listener: %w", err)
+}
+
+func (listener *libreOfficeListener) port() int {
+	listener.cfgMu.RLock()
+	defer listener.cfgMu.RUnlock()
+
+	return listener.socketPort
+}
+
+func (listener *libreOfficeListener) queue() int {
+	listener.queueLengthMu.RLock()
+	defer listener.queueLengthMu.RUnlock()
+
+	return listener.queueLength
+}
+
+func (listener *libreOfficeListener) healthy() bool {
+	_, err := net.DialTimeout("tcp", fmt.Sprintf("127.0.0.1:%d", listener.port()), time.Duration(1)*time.Second)
+
+	return err == nil
+}
+
+// Interface guards.
+var (
+	_ listener = (*libreOfficeListener)(nil)
+)

pkg/modules/libreoffice/uno/listener_test.go

@@ -0,0 +1,288 @@
+package uno
+
+import (
+	"context"
+	"errors"
+	"os"
+	"testing"
+	"time"
+
+	"go.uber.org/zap"
+)
+
+func TestListener_start(t *testing.T) {
+	tests := []struct {
+		name           string
+		listener       listener
+		expectStartErr bool
+	}{
+		{
+			name:     "nominal behavior",
+			listener: newLibreOfficeListener(zap.NewNop(), os.Getenv("LIBREOFFICE_BIN_PATH"), time.Duration(10)*time.Second, 10),
+		},
+		{
+			name:           "non-exit code 81 on first start",
+			listener:       newLibreOfficeListener(zap.NewNop(), "foo", time.Duration(10)*time.Second, 10),
+			expectStartErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.listener.start(zap.NewNop())
+
+			if tc.expectStartErr && err == nil {
+				t.Fatalf("expected listener.start() error, but got none")
+			}
+
+			if !tc.expectStartErr && err != nil {
+				t.Fatalf("expected no error from listener.start(), but got: %v", err)
+			}
+
+			if err != nil {
+				if tc.listener.healthy() {
+					t.Error("expected a non-running LibreOffice listener")
+				}
+
+				return
+			}
+
+			err = tc.listener.stop(zap.NewNop())
+			if err != nil {
+				t.Fatalf("expected no error from listener.stop(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestListener_stop(t *testing.T) {
+	listener := newLibreOfficeListener(
+		zap.NewNop(),
+		os.Getenv("LIBREOFFICE_BIN_PATH"),
+		time.Duration(10)*time.Second,
+		10,
+	)
+
+	err := listener.start(zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.start(), but got: %v", err)
+	}
+
+	err = listener.stop(zap.NewNop())
+	if err != nil {
+		t.Errorf("expected no error from listener.stop(), but got: %v", err)
+	}
+}
+
+func TestListener_lock(t *testing.T) {
+	listener := newLibreOfficeListener(
+		zap.NewNop(),
+		os.Getenv("LIBREOFFICE_BIN_PATH"),
+		time.Duration(10)*time.Second,
+		10,
+	)
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
+
+	err := listener.lock(ctx, zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.lock(), but got: %v", err)
+	}
+
+	cancel()
+
+	err = listener.lock(ctx, zap.NewNop())
+	if !errors.Is(err, context.Canceled) {
+		t.Errorf("expected %v error, but got: %v", context.Canceled, err)
+	}
+}
+
+func TestListener_unlock(t *testing.T) {
+	tests := []struct {
+		name     string
+		listener listener
+		teardown func(listener listener) error
+	}{
+		{
+			name: "nominal behavior",
+			listener: func() listener {
+				listener := newLibreOfficeListener(zap.NewNop(), os.Getenv("LIBREOFFICE_BIN_PATH"), time.Duration(10)*time.Second, 10)
+
+				err := listener.start(zap.NewNop())
+				if err != nil {
+					t.Fatalf("expected no error from listener.start(), but got: %v", err)
+				}
+				return listener
+			}(),
+			teardown: func(listener listener) error {
+				return listener.stop(zap.NewNop())
+			},
+		},
+		{
+			name: "unhealthy listener",
+			listener: func() listener {
+				listener := newLibreOfficeListener(zap.NewNop(), os.Getenv("LIBREOFFICE_BIN_PATH"), time.Duration(10)*time.Second, 10)
+
+				err := listener.start(zap.NewNop())
+				if err != nil {
+					t.Fatalf("expected no error from listener.start(), but got: %v", err)
+				}
+
+				err = listener.stop(zap.NewNop())
+				if err != nil {
+					t.Fatalf("expected no error from listener.stop(), but got: %v", err)
+				}
+
+				return listener
+			}(),
+			teardown: func(listener listener) error {
+				return listener.stop(zap.NewNop())
+			},
+		},
+		{
+			name: "threshold reached",
+			listener: func() listener {
+				listener := newLibreOfficeListener(zap.NewNop(), os.Getenv("LIBREOFFICE_BIN_PATH"), time.Duration(10)*time.Second, 1)
+
+				err := listener.start(zap.NewNop())
+				if err != nil {
+					t.Fatalf("expected no error from listener.start(), but got: %v", err)
+				}
+				return listener
+			}(),
+			teardown: func(listener listener) error {
+				return listener.stop(zap.NewNop())
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
+			defer cancel()
+
+			err := tc.listener.lock(ctx, zap.NewNop())
+			if err != nil {
+				t.Fatalf("expected no error from listener.lock(), but got: %v", err)
+			}
+
+			err = tc.listener.unlock(zap.NewNop())
+			if err != nil {
+				t.Errorf("expected no error from listener.unlock(), but got: %v", err)
+			}
+
+			err = tc.teardown(tc.listener)
+			if err != nil {
+				t.Errorf("expected no error from tc.teardown(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestListener_port(t *testing.T) {
+	listener := newLibreOfficeListener(
+		zap.NewNop(),
+		os.Getenv("LIBREOFFICE_BIN_PATH"),
+		time.Duration(10)*time.Second,
+		10,
+	)
+
+	err := listener.start(zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.start(), but got: %v", err)
+	}
+
+	port := listener.port()
+	if port == 0 {
+		t.Error("expected a non-zero value from listener.port")
+	}
+
+	err = listener.stop(zap.NewNop())
+	if err != nil {
+		t.Errorf("expected no error from listener.stop(), but got: %v", err)
+	}
+}
+
+func TestListener_queue(t *testing.T) {
+	listener := newLibreOfficeListener(
+		zap.NewNop(),
+		os.Getenv("LIBREOFFICE_BIN_PATH"),
+		time.Duration(10)*time.Second,
+		10,
+	)
+
+	queueLength := listener.queue()
+	if queueLength != 0 {
+		t.Fatalf("expected a zero value from listener.queue(), but got %d", queueLength)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
+
+	err := listener.lock(ctx, zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.lock(), but got: %v", err)
+	}
+
+	queueLength = listener.queue()
+	if queueLength != 0 {
+		t.Fatalf("expected a zero value from listener.queue(), but got %d", queueLength)
+	}
+
+	go func() {
+		_ = listener.lock(ctx, zap.NewNop())
+	}()
+
+	time.Sleep(time.Duration(100) * time.Millisecond)
+
+	queueLength = listener.queue()
+	if queueLength != 1 {
+		t.Fatalf("expected 1 from listener.queue(), but got %d", queueLength)
+	}
+
+	go func() {
+		_ = listener.lock(ctx, zap.NewNop())
+	}()
+
+	time.Sleep(time.Duration(100) * time.Millisecond)
+
+	queueLength = listener.queue()
+	if queueLength != 2 {
+		t.Fatalf("expected 2 from listener.queue(), but got %d", queueLength)
+	}
+
+	cancel()
+
+	time.Sleep(time.Duration(100) * time.Millisecond)
+
+	queueLength = listener.queue()
+	if queueLength != 0 {
+		t.Fatalf("expected a zero value from listener.queue(), but got %d", queueLength)
+	}
+}
+
+func TestListener_healthy(t *testing.T) {
+	listener := newLibreOfficeListener(
+		zap.NewNop(),
+		os.Getenv("LIBREOFFICE_BIN_PATH"),
+		time.Duration(10)*time.Second,
+		10,
+	)
+
+	err := listener.start(zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.start(), but got: %v", err)
+	}
+
+	if !listener.healthy() {
+		t.Error("expected an healthy LibreOffice listener")
+	}
+
+	err = listener.stop(zap.NewNop())
+	if err != nil {
+		t.Fatalf("expected no error from listener.stop(), but got: %v", err)
+	}
+
+	if listener.healthy() {
+		t.Errorf("expected a non-healthy LibreOffice listener")
+	}
+}

pkg/modules/libreoffice/uno/mocks.go

@@ -0,0 +1,36 @@
+package uno
+
+import (
+	"context"
+
+	"go.uber.org/zap"
+)
+
+// APIMock is a mock for the API interface.
+type APIMock struct {
+	PDFMock        func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	ExtensionsMock func() []string
+}
+
+func (api APIMock) PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+	return api.PDFMock(ctx, logger, inputPath, outputPath, options)
+}
+
+func (api APIMock) Extensions() []string {
+	return api.ExtensionsMock()
+}
+
+// ProviderMock is a mock for the Provider interface.
+type ProviderMock struct {
+	UNOMock func() (API, error)
+}
+
+func (provider ProviderMock) UNO() (API, error) {
+	return provider.UNOMock()
+}
+
+// Interface guards.
+var (
+	_ API      = (*APIMock)(nil)
+	_ Provider = (*ProviderMock)(nil)
+)

pkg/modules/libreoffice/uno/mocks_test.go

@@ -0,0 +1,42 @@
+package uno
+
+import (
+	"context"
+	"testing"
+
+	"go.uber.org/zap"
+)
+
+func TestAPIMock(t *testing.T) {
+	mock := APIMock{
+		PDFMock: func(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+			return nil
+		},
+		ExtensionsMock: func() []string {
+			return nil
+		},
+	}
+
+	err := mock.PDF(context.Background(), zap.NewNop(), "", "", Options{})
+	if err != nil {
+		t.Errorf("expected no error from mock.PDF(), but got: %v", err)
+	}
+
+	ext := mock.Extensions()
+	if ext != nil {
+		t.Errorf("expected no extensions from mock.Extensions(), but got: %+v", ext)
+	}
+}
+
+func TestProviderMock(t *testing.T) {
+	mock := ProviderMock{
+		UNOMock: func() (API, error) {
+			return APIMock{}, nil
+		},
+	}
+
+	_, err := mock.UNO()
+	if err != nil {
+		t.Errorf("expected no error from mock.UNO(), but got: %v", err)
+	}
+}

pkg/modules/libreoffice/uno/uno.go

@@ -0,0 +1,522 @@
+package uno
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/alexliesenfeld/health"
+	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
+	"github.com/gotenberg/gotenberg/v7/pkg/modules/api"
+	flag "github.com/spf13/pflag"
+	"go.uber.org/multierr"
+	"go.uber.org/zap"
+)
+
+func init() {
+	gotenberg.MustRegisterModule(UNO{})
+}
+
+var (
+	// ErrInvalidPDFformat happens if the PDF format option cannot be handled
+	// by LibreOffice.
+	ErrInvalidPDFformat = errors.New("invalid PDF format")
+
+	// ErrMalformedPageRanges happens if the page ranges option cannot be
+	// interpreted by LibreOffice.
+	ErrMalformedPageRanges = errors.New("page ranges are malformed")
+)
+
+// UNO is a module which provides an API to interact with LibreOffice.
+type UNO struct {
+	unoconvBinPath              string
+	libreOfficeBinPath          string
+	libreOfficeStartTimeout     time.Duration
+	libreOfficeRestartThreshold int
+
+	listener listener
+	logger   *zap.Logger
+}
+
+// Options gathers available options when converting a document to PDF.
+type Options struct {
+	// Landscape allows to change the orientation of the resulting PDF.
+	// Optional.
+	Landscape bool
+
+	// PageRanges allows to select the pages to convert.
+	// TODO: should prefer a method form PDFEngine.
+	// Optional.
+	PageRanges string
+
+	// PDFformat allows to convert the resulting PDF to PDF/A-1a, PDF/A-2b, or
+	// PDF/A-3b.
+	// Optional.
+	PDFformat string
+}
+
+// API is an abstraction on top of uno.
+type API interface {
+	PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
+	Extensions() []string
+}
+
+// Provider is a module interface which exposes a method for creating an API
+// for other modules.
+//
+//	func (m *YourModule) Provision(ctx *gotenberg.Context) error {
+//		provider, _ := ctx.Module(new(uno.Provider))
+//		unoAPI, _      := provider.(uno.Provider).UNO()
+//	}
+type Provider interface {
+	UNO() (API, error)
+}
+
+// Descriptor returns a UNO's module descriptor.
+func (UNO) Descriptor() gotenberg.ModuleDescriptor {
+	return gotenberg.ModuleDescriptor{
+		ID: "uno",
+		FlagSet: func() *flag.FlagSet {
+			fs := flag.NewFlagSet("uno", flag.ExitOnError)
+			fs.Duration("uno-listener-start-timeout", time.Duration(10)*time.Second, "Time limit for starting the LibreOffice listener")
+			fs.Int("uno-listener-restart-threshold", 10, "Operations limit after which the LibreOffice listener is restarted - 0 means no long-running LibreOffice listener")
+			fs.Bool("unoconv-disable-listener", false, "Do not start a long-running listener - save resources in detriment of unitary performance")
+
+			err := fs.MarkDeprecated("unoconv-disable-listener", "use uno-listener-restart-threshold with 0 instead")
+			if err != nil {
+				panic(fmt.Errorf("create deprecated flags for the uno module: %v", err))
+			}
+
+			return fs
+		}(),
+		New: func() gotenberg.Module { return new(UNO) },
+	}
+}
+
+// Provision sets the module properties. It returns an error if the environment
+// variables UNOCONV_BIN_PATH and LIBREOFFICE_BIN_PATH are not set.
+func (mod *UNO) Provision(ctx *gotenberg.Context) error {
+	flags := ctx.ParsedFlags()
+	mod.libreOfficeStartTimeout = flags.MustDuration("uno-listener-start-timeout")
+	mod.libreOfficeRestartThreshold = flags.MustInt("uno-listener-restart-threshold")
+
+	disableListener := flags.MustBool("unoconv-disable-listener")
+	if disableListener {
+		mod.libreOfficeRestartThreshold = 0
+	}
+
+	unoconvBinPath, ok := os.LookupEnv("UNOCONV_BIN_PATH")
+	if !ok {
+		return errors.New("UNOCONV_BIN_PATH environment variable is not set")
+	}
+
+	mod.unoconvBinPath = unoconvBinPath
+
+	libreOfficeBinPath, ok := os.LookupEnv("LIBREOFFICE_BIN_PATH")
+	if !ok {
+		return errors.New("LIBREOFFICE_BIN_PATH environment variable is not set")
+	}
+
+	mod.libreOfficeBinPath = libreOfficeBinPath
+
+	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
+	if err != nil {
+		return fmt.Errorf("get logger provider: %w", err)
+	}
+
+	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(mod)
+	if err != nil {
+		return fmt.Errorf("get logger: %w", err)
+	}
+
+	mod.logger = logger
+
+	mod.listener = newLibreOfficeListener(
+		mod.logger,
+		mod.libreOfficeBinPath,
+		mod.libreOfficeStartTimeout,
+		mod.libreOfficeRestartThreshold,
+	)
+
+	return nil
+}
+
+// Validate validates the module properties.
+func (mod UNO) Validate() error {
+	var err error
+
+	_, statErr := os.Stat(mod.unoconvBinPath)
+	if os.IsNotExist(statErr) {
+		err = multierr.Append(err, fmt.Errorf("unoconv binary path does not exist: %w", statErr))
+	}
+
+	_, statErr = os.Stat(mod.libreOfficeBinPath)
+	if os.IsNotExist(statErr) {
+		err = multierr.Append(err, fmt.Errorf("LibreOffice binary path does not exist: %w", statErr))
+	}
+
+	return err
+}
+
+// Start starts the long-running LibreOffice listener if the threshold is
+// superior to zero.
+func (mod UNO) Start() error {
+	if mod.libreOfficeRestartThreshold == 0 {
+		return nil
+	}
+
+	err := mod.listener.start(mod.logger)
+	if err == nil {
+		return nil
+	}
+
+	return fmt.Errorf("start long-running LibreOffice listener: %w", err)
+}
+
+// StartupMessage returns a custom startup message.
+func (mod UNO) StartupMessage() string {
+	if mod.libreOfficeRestartThreshold == 0 {
+		return "Long-running LibreOffice listener disabled"
+	}
+
+	return "Long-running LibreOffice listener started"
+}
+
+// Stop stops the long-running LibreOffice Listener if it exists.
+func (mod UNO) Stop(ctx context.Context) error {
+	if mod.libreOfficeRestartThreshold == 0 {
+		return nil
+	}
+
+	// Block until the context is done so that other module may gracefully stop
+	// before we do a shutdown cleanup.
+	mod.logger.Debug("wait for the end of grace duration")
+
+	<-ctx.Done()
+
+	err := mod.listener.stop(mod.logger)
+	if err == nil {
+		return nil
+	}
+
+	return fmt.Errorf("stop long-running LibreOffice supervisor")
+}
+
+// Metrics returns the metrics.
+func (mod UNO) Metrics() ([]gotenberg.Metric, error) {
+	return []gotenberg.Metric{
+		{
+			Name:        "unoconv_active_instances_count",
+			Description: "Current number of active unoconv instances.",
+			Read: func() float64 {
+				activeInstancesCountMu.RLock()
+				defer activeInstancesCountMu.RUnlock()
+
+				return activeInstancesCount
+			},
+		},
+		{
+			Name:        "libreoffice_listener_active_instances_count",
+			Description: "Current number of active LibreOffice listener instances.",
+			Read: func() float64 {
+				if mod.libreOfficeRestartThreshold == 0 {
+					listenerActiveInstancesCountMu.RLock()
+					defer listenerActiveInstancesCountMu.RUnlock()
+
+					return listenerActiveInstancesCount
+				}
+
+				if mod.listener.healthy() {
+					return 1
+				}
+
+				return 0
+			},
+		},
+		{
+			Name:        "unoconv_listener_active_instances_count",
+			Description: "Current number of active unoconv listener instances - deprecated, prefer libreoffice_listener_active_instances_count.",
+			Read: func() float64 {
+				if mod.libreOfficeRestartThreshold == 0 {
+					listenerActiveInstancesCountMu.RLock()
+					defer listenerActiveInstancesCountMu.RUnlock()
+
+					return listenerActiveInstancesCount
+				}
+
+				if mod.listener.healthy() {
+					return 1
+				}
+
+				return 0
+			},
+		},
+		{
+			Name:        "libreoffice_listener_queue_length",
+			Description: "Current number of processes in the queue.",
+			Read: func() float64 {
+				return float64(mod.listener.queue())
+			},
+		},
+		{
+			Name:        "unoconv_listener_queue_length",
+			Description: "Current number of processes in the queue - deprecated, prefer libreoffice_listener_queue_length.",
+			Read: func() float64 {
+				return float64(mod.listener.queue())
+			},
+		},
+	}, nil
+}
+
+// Checks adds a health check that verifies the health of the long-running
+// LibreOffice listener.
+func (mod UNO) Checks() ([]health.CheckerOption, error) {
+	if mod.libreOfficeRestartThreshold == 0 {
+		return nil, nil
+	}
+
+	return []health.CheckerOption{
+		health.WithCheck(health.Check{
+			Name: "uno",
+			Check: func(_ context.Context) error {
+				if mod.listener.healthy() {
+					return nil
+				}
+
+				return errors.New("long-running LibreOffice listener unhealthy")
+			},
+			// The long-running LibreOffice listener may be restarting, so we
+			// wait a given amount of time until we consider the module
+			// unavailable.
+			MaxTimeInError: mod.libreOfficeStartTimeout,
+		}),
+	}, nil
+}
+
+// PDF converts a document to PDF.
+//
+// If there is no long-running LibreOffice listener, it creates a dedicated
+// LibreOffice instance for the conversion. Substantial calls to this method
+// may increase CPU and memory usage drastically
+//
+// If there is a long-running LibreOffice listener, the conversion performance
+// improves substantially. However, it cannot perform parallel operations.
+func (mod UNO) PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
+	args := []string{
+		"--no-launch",
+		"--format",
+		"pdf",
+	}
+
+	switch mod.libreOfficeRestartThreshold {
+	case 0:
+		listener := newLibreOfficeListener(logger, mod.libreOfficeBinPath, mod.libreOfficeStartTimeout, 0)
+
+		err := listener.start(logger)
+		if err != nil {
+			return fmt.Errorf("start LibreOffice listener: %w", err)
+		}
+
+		defer func() {
+			err := listener.stop(logger)
+			if err != nil {
+				logger.Error(fmt.Sprintf("stop LibreOffice listener: %v", err))
+			}
+		}()
+
+		args = append(args, "--port", fmt.Sprintf("%d", listener.port()))
+	default:
+		err := mod.listener.lock(ctx, logger)
+		if err != nil {
+			return fmt.Errorf("lock long-running LibreOffice listener: %w", err)
+		}
+
+		defer func() {
+			go func() {
+				err := mod.listener.unlock(logger)
+				if err != nil {
+					mod.logger.Error(fmt.Sprintf("unlock long-running LibreOffice listener: %v", err))
+				}
+			}()
+		}()
+
+		// If the LibreOffice listener is restarting while acquiring the lock,
+		// the port will change. It's therefore important to add the port args
+		// after we acquire the lock.
+		args = append(args, "--port", fmt.Sprintf("%d", mod.listener.port()))
+	}
+
+	checkedEntry := logger.Check(zap.DebugLevel, "check for debug level before setting high verbosity")
+	if checkedEntry != nil {
+		args = append(args, "-vvv")
+	}
+
+	if options.Landscape {
+		args = append(args, "--printer", "PaperOrientation=landscape")
+	}
+
+	if options.PageRanges != "" {
+		args = append(args, "--export", fmt.Sprintf("PageRange=%s", options.PageRanges))
+	}
+
+	switch options.PDFformat {
+	case "":
+	case gotenberg.FormatPDFA1a:
+		args = append(args, "--export", "SelectPdfVersion=1")
+	case gotenberg.FormatPDFA2b:
+		args = append(args, "--export", "SelectPdfVersion=2")
+	case gotenberg.FormatPDFA3b:
+		args = append(args, "--export", "SelectPdfVersion=3")
+	default:
+		return ErrInvalidPDFformat
+	}
+
+	args = append(args, "--output", outputPath, inputPath)
+
+	cmd, err := gotenberg.CommandContext(ctx, logger, mod.unoconvBinPath, args...)
+	if err != nil {
+		return fmt.Errorf("create unoconv command: %w", err)
+	}
+
+	logger.Debug(fmt.Sprintf("print to PDF with: %+v", options))
+
+	activeInstancesCountMu.Lock()
+	activeInstancesCount += 1
+	activeInstancesCountMu.Unlock()
+
+	exitCode, err := cmd.Exec()
+
+	activeInstancesCountMu.Lock()
+	activeInstancesCount -= 1
+	activeInstancesCountMu.Unlock()
+
+	if err == nil {
+		return nil
+	}
+
+	// Unoconv/LibreOffice errors are not explicit.
+	// That's why we have to make an educated guess according to the exit code
+	// and given inputs.
+
+	if exitCode == 5 && options.PageRanges != "" {
+		return ErrMalformedPageRanges
+	}
+
+	// Possible errors:
+	// 1. Unoconv/LibreOffice failed for some reason.
+	// 2. Context done.
+	//
+	// On the second scenario, LibreOffice might not have time to remove some
+	// of its temporary files, as it has been killed without warning. The
+	// garbage collector will delete them for us (if the module is loaded).
+	return fmt.Errorf("unoconv PDF: %w", err)
+}
+
+// Extensions returns the file extensions available for conversions.
+func (mod UNO) Extensions() []string {
+	return []string{
+		".bib",
+		".doc",
+		".xml",
+		".docx",
+		".fodt",
+		".html",
+		".ltx",
+		".txt",
+		".odt",
+		".ott",
+		".pdb",
+		".pdf",
+		".psw",
+		".rtf",
+		".sdw",
+		".stw",
+		".sxw",
+		".uot",
+		".vor",
+		".wps",
+		".epub",
+		".png",
+		".bmp",
+		".emf",
+		".eps",
+		".fodg",
+		".gif",
+		".jpg",
+		".jpeg",
+		".met",
+		".odd",
+		".otg",
+		".pbm",
+		".pct",
+		".pgm",
+		".ppm",
+		".ras",
+		".std",
+		".svg",
+		".svm",
+		".swf",
+		".sxd",
+		".sxw",
+		".tif",
+		".tiff",
+		".xhtml",
+		".xpm",
+		".odp",
+		".fodp",
+		".potm",
+		".pot",
+		".pptx",
+		".pps",
+		".ppt",
+		".pwp",
+		".sda",
+		".sdd",
+		".sti",
+		".sxi",
+		".uop",
+		".wmf",
+		".csv",
+		".dbf",
+		".dif",
+		".fods",
+		".ods",
+		".ots",
+		".pxl",
+		".sdc",
+		".slk",
+		".stc",
+		".sxc",
+		".uos",
+		".xls",
+		".xlt",
+		".xlsx",
+	}
+}
+
+// UNO returns an API for interacting with LibreOffice.
+func (mod UNO) UNO() (API, error) {
+	return mod, nil
+}
+
+var (
+	listenerActiveInstancesCount   float64
+	listenerActiveInstancesCountMu sync.RWMutex
+	activeInstancesCount           float64
+	activeInstancesCountMu         sync.RWMutex
+)
+
+// Interface guards.
+var (
+	_ gotenberg.Module          = (*UNO)(nil)
+	_ gotenberg.Provisioner     = (*UNO)(nil)
+	_ gotenberg.Validator       = (*UNO)(nil)
+	_ gotenberg.App             = (*UNO)(nil)
+	_ gotenberg.MetricsProvider = (*UNO)(nil)
+	_ api.HealthChecker         = (*UNO)(nil)
+	_ API                       = (*UNO)(nil)
+	_ Provider                  = (*UNO)(nil)
+)

pkg/modules/libreoffice/uno/uno_test.go

@@ -0,0 +1,865 @@
+package uno
+
+import (
+	"context"
+	"errors"
+	"os"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/alexliesenfeld/health"
+	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
+	flag "github.com/spf13/pflag"
+	"go.uber.org/zap"
+)
+
+func TestUNO_Descriptor(t *testing.T) {
+	descriptor := UNO{}.Descriptor()
+
+	actual := reflect.TypeOf(descriptor.New())
+	expect := reflect.TypeOf(new(UNO))
+
+	if actual != expect {
+		t.Errorf("expected '%s' but got '%s'", expect, actual)
+	}
+}
+
+func TestUNO_Provision(t *testing.T) {
+	tests := []struct {
+		name               string
+		ctx                *gotenberg.Context
+		expectProvisionErr bool
+	}{
+		{
+			name: "nominal behavior",
+			ctx: func() *gotenberg.Context {
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
+				}
+
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(UNO).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
+					},
+				)
+			}(),
+		},
+		{
+			name: "threshold from deprecated flag --unoconv-disable-listener",
+			ctx: func() *gotenberg.Context {
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
+				}
+
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: func() *flag.FlagSet {
+							fs := new(UNO).Descriptor().FlagSet
+							err := fs.Parse([]string{"--unoconv-disable-listener=true"})
+
+							if err != nil {
+								t.Fatalf("expected no error from fs.Parse(), but got: %v", err)
+							}
+
+							return fs
+						}(),
+					},
+					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
+					},
+				)
+			}(),
+		},
+		{
+			name: "no logger provider",
+			ctx: func() *gotenberg.Context {
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(UNO).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{},
+				)
+			}(),
+			expectProvisionErr: true,
+		},
+		{
+			name: "no logger from logger provider",
+			ctx: func() *gotenberg.Context {
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return nil, errors.New("foo")
+				}
+
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(UNO).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
+					},
+				)
+			}(),
+			expectProvisionErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := new(UNO)
+			err := mod.Provision(tc.ctx)
+
+			if tc.expectProvisionErr && err == nil {
+				t.Errorf("expected mod.Provision() error, but got none")
+			}
+
+			if !tc.expectProvisionErr && err != nil {
+				t.Errorf("expected no error from mod.Provision(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestUNO_Validate(t *testing.T) {
+	tests := []struct {
+		name               string
+		unoconvBinPath     string
+		libreOfficeBinPath string
+		expectValidateErr  bool
+	}{
+		{
+			name:               "nominal behavior",
+			unoconvBinPath:     os.Getenv("UNOCONV_BIN_PATH"),
+			libreOfficeBinPath: os.Getenv("LIBREOFFICE_BIN_PATH"),
+		},
+		{
+			name:               "unoconv bin path does not exist",
+			unoconvBinPath:     "/foo",
+			libreOfficeBinPath: os.Getenv("LIBREOFFICE_BIN_PATH"),
+			expectValidateErr:  true,
+		},
+		{
+			name:               "LibreOffice bin path does not exist",
+			unoconvBinPath:     os.Getenv("UNOCONV_BIN_PATH"),
+			libreOfficeBinPath: "/foo",
+			expectValidateErr:  true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := UNO{
+				unoconvBinPath:     tc.unoconvBinPath,
+				libreOfficeBinPath: tc.libreOfficeBinPath,
+			}
+
+			err := mod.Validate()
+
+			if tc.expectValidateErr && err == nil {
+				t.Errorf("expected mod.Validate() error, but got none")
+			}
+
+			if !tc.expectValidateErr && err != nil {
+				t.Errorf("expected no error from mod.Validate(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestUNO_Start(t *testing.T) {
+	tests := []struct {
+		name           string
+		mod            UNO
+		expectStartErr bool
+	}{
+		{
+			name: "nominal behavior",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					startMock: func(logger *zap.Logger) error {
+						return nil
+					},
+				},
+			},
+		},
+		{
+			name: "no long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+			},
+		},
+		{
+			name: "start error",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					startMock: func(logger *zap.Logger) error {
+						return errors.New("foo")
+					},
+				},
+			},
+			expectStartErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.mod.Start()
+
+			if tc.expectStartErr && err == nil {
+				t.Errorf("expected mod.Start() error, but got none")
+			}
+
+			if !tc.expectStartErr && err != nil {
+				t.Errorf("expected no error from mod.Start(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestUNO_StartupMessage(t *testing.T) {
+	tests := []struct {
+		name          string
+		mod           UNO
+		expectMessage string
+	}{
+		{
+			name: "long-running LibreOffice listener started",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+			},
+			expectMessage: "Long-running LibreOffice listener started",
+		},
+		{
+			name: "long-running LibreOffice listener disabled",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+			},
+			expectMessage: "Long-running LibreOffice listener disabled",
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			actual := tc.mod.StartupMessage()
+
+			if tc.expectMessage != actual {
+				t.Errorf("expected '%s' from mod.StartupMessage(), but got '%s'", tc.expectMessage, actual)
+			}
+		})
+	}
+}
+
+func TestUNO_Stop(t *testing.T) {
+	tests := []struct {
+		name          string
+		mod           UNO
+		expectStopErr bool
+	}{
+		{
+			name: "nominal behavior",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					stopMock: func(logger *zap.Logger) error {
+						return nil
+					},
+				},
+				logger: zap.NewNop(),
+			},
+		},
+		{
+			name: "no long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+				logger:                      zap.NewNop(),
+			},
+		},
+		{
+			name: "stop error",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					stopMock: func(logger *zap.Logger) error {
+						return errors.New("foo")
+					},
+				},
+				logger: zap.NewNop(),
+			},
+			expectStopErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(10)*time.Second)
+			cancel()
+
+			err := tc.mod.Stop(ctx)
+
+			if tc.expectStopErr && err == nil {
+				t.Errorf("expected mod.Stop() error, but got none")
+			}
+
+			if !tc.expectStopErr && err != nil {
+				t.Errorf("expected no error from mod.Stop(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestUNO_Metrics(t *testing.T) {
+	tests := []struct {
+		name                                          string
+		mod                                           UNO
+		expectUnoconvActiveInstancesCount             float64
+		expectLibreOfficeListenerActiveInstancesCount float64
+		expectLibreOfficeListenerQueueLength          float64
+	}{
+		{
+			name: "with healthy long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					queueMock: func() int {
+						return 0
+					},
+					healthyMock: func() bool {
+						return true
+					},
+				},
+			},
+			expectLibreOfficeListenerActiveInstancesCount: 1,
+		},
+		{
+			name: "with unhealthy long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					queueMock: func() int {
+						return 0
+					},
+					healthyMock: func() bool {
+						return false
+					},
+				},
+			},
+		},
+		{
+			name: "with no long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+				listener: listenerMock{
+					queueMock: func() int {
+						return 0
+					},
+					healthyMock: func() bool {
+						return false
+					},
+				},
+			},
+		},
+		{
+			name: "with a queue of 3",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+				listener: listenerMock{
+					queueMock: func() int {
+						return 3
+					},
+					healthyMock: func() bool {
+						return true
+					},
+				},
+			},
+			expectLibreOfficeListenerQueueLength: 3,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			metrics, err := tc.mod.Metrics()
+			if err != nil {
+				t.Fatalf("expected no error from mod.Metrics(), but got: %v", err)
+			}
+
+			for _, metric := range metrics {
+				switch metric.Name {
+				case "unoconv_active_instances_count":
+					actual := metric.Read()
+					if actual != tc.expectUnoconvActiveInstancesCount {
+						t.Errorf("expected 'unoconv_active_instances_count' to be %.0f, but got %.0f", tc.expectUnoconvActiveInstancesCount, actual)
+					}
+				case "libreoffice_listener_active_instances_count":
+					actual := metric.Read()
+					if actual != tc.expectLibreOfficeListenerActiveInstancesCount {
+						t.Errorf("expected 'libreoffice_listener_active_instances_count' to be %.0f, but got %.0f", tc.expectLibreOfficeListenerActiveInstancesCount, actual)
+					}
+				case "unoconv_listener_active_instances_count":
+					actual := metric.Read()
+					if actual != tc.expectLibreOfficeListenerActiveInstancesCount {
+						t.Errorf("expected 'unoconv_listener_active_instances_count' to be %.0f, but got %.0f", tc.expectLibreOfficeListenerActiveInstancesCount, actual)
+					}
+				case "libreoffice_listener_queue_length":
+					actual := metric.Read()
+					if actual != tc.expectLibreOfficeListenerQueueLength {
+						t.Errorf("expected 'libreoffice_listener_queue_length' to be %.0f, but got %.0f", tc.expectLibreOfficeListenerQueueLength, actual)
+					}
+				case "unoconv_listener_queue_length":
+					actual := metric.Read()
+					if actual != tc.expectLibreOfficeListenerQueueLength {
+						t.Errorf("expected 'unoconv_listener_queue_length' to be %.0f, but got %.0f", tc.expectLibreOfficeListenerQueueLength, actual)
+					}
+				}
+			}
+		})
+	}
+}
+
+func TestUNO_Checks(t *testing.T) {
+	tests := []struct {
+		name                     string
+		mod                      UNO
+		expectAvailabilityStatus health.AvailabilityStatus
+	}{
+		{
+			name: "no long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 0,
+			},
+		},
+		{
+			name: "with healthy long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					healthyMock: func() bool {
+						return true
+					},
+				},
+			},
+			expectAvailabilityStatus: health.StatusUp,
+		},
+		{
+			name: "with unhealthy long-running LibreOffice listener",
+			mod: UNO{
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					healthyMock: func() bool {
+						return false
+					},
+				},
+			},
+			expectAvailabilityStatus: health.StatusDown,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			checks, err := tc.mod.Checks()
+			if err != nil {
+				t.Fatalf("expected no error from mod.Checks(), but got: %v", err)
+			}
+
+			if len(checks) == 0 {
+				return
+			}
+
+			if len(checks) != 1 {
+				t.Fatalf("expected 1 check from mod.Checks(), but got %d", len(checks))
+			}
+
+			checker := health.NewChecker(checks...)
+			result := checker.Check(context.Background())
+
+			if result.Status != tc.expectAvailabilityStatus {
+				t.Errorf("expected '%s' as availability status, but got '%s'", tc.expectAvailabilityStatus, result.Status)
+			}
+		})
+	}
+}
+
+func TestUNO_PDF(t *testing.T) {
+	tests := []struct {
+		name         string
+		mod          UNO
+		ctx          context.Context
+		logger       *zap.Logger
+		inputPath    string
+		options      Options
+		expectPDFErr bool
+		teardown     func(mod UNO) error
+	}{
+		{
+			name: "nominal behavior with no long-running LibreOffice listener",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+		},
+		{
+			name: "nominal behavior with a long-running LibreOffice listener",
+			mod: func() UNO {
+				mod := UNO{
+					unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+					libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+					libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+					libreOfficeRestartThreshold: 10,
+					logger:                      zap.NewNop(),
+				}
+				mod.listener = newLibreOfficeListener(
+					mod.logger,
+					mod.libreOfficeBinPath,
+					mod.libreOfficeStartTimeout,
+					mod.libreOfficeRestartThreshold,
+				)
+
+				err := mod.Start()
+				if err != nil {
+					t.Fatalf("expected no error from mod.Start(), but got: %v", err)
+				}
+
+				return mod
+			}(),
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			teardown: func(mod UNO) error {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return mod.Stop(ctx)
+			},
+		},
+		{
+			name: "convert with a debug logger",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewExample(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+		},
+		{
+			name: "convert with landscape",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				Landscape: true,
+			},
+		},
+		{
+			name: "convert with page ranges",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PageRanges: "1-2",
+			},
+		},
+		{
+			name: "convert with invalid page ranges",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PageRanges: "foo",
+			},
+			expectPDFErr: true,
+		},
+		{
+			name: "convert to PDF/A-1a",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PDFformat: gotenberg.FormatPDFA1a,
+			},
+		},
+		{
+			name: "convert to PDF/A-2b",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PDFformat: gotenberg.FormatPDFA2b,
+			},
+		},
+		{
+			name: "convert to PDF/A-3b",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PDFformat: gotenberg.FormatPDFA3b,
+			},
+		},
+		{
+			name: "convert to invalid PDF format",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:       context.Background(),
+			logger:    zap.NewNop(),
+			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
+			options: Options{
+				PDFformat: "foo",
+			},
+			expectPDFErr: true,
+		},
+		{
+			name: "nil context",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx:          nil,
+			logger:       zap.NewNop(),
+			inputPath:    "/tests/test/testdata/libreoffice/sample1.docx",
+			expectPDFErr: true,
+		},
+		{
+			name: "expired context",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 0,
+			},
+			ctx: func() context.Context {
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
+
+				return ctx
+			}(),
+			logger:       zap.NewNop(),
+			inputPath:    "/tests/test/testdata/libreoffice/sample1.docx",
+			expectPDFErr: true,
+		},
+		{
+			name: "cannot lock long-running LibreOffice listener",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					lockMock: func(ctx context.Context, logger *zap.Logger) error {
+						return errors.New("foo")
+					},
+				},
+				logger: zap.NewNop(),
+			},
+			ctx:          context.Background(),
+			logger:       zap.NewNop(),
+			inputPath:    "/tests/test/testdata/libreoffice/sample1.docx",
+			expectPDFErr: true,
+		},
+		{
+			name: "cannot unlock long-running LibreOffice listener",
+			mod: UNO{
+				unoconvBinPath:              os.Getenv("UNOCONV_BIN_PATH"),
+				libreOfficeBinPath:          os.Getenv("LIBREOFFICE_BIN_PATH"),
+				libreOfficeStartTimeout:     time.Duration(10) * time.Second,
+				libreOfficeRestartThreshold: 10,
+				listener: listenerMock{
+					lockMock: func(ctx context.Context, logger *zap.Logger) error {
+						return nil
+					},
+					unlockMock: func(logger *zap.Logger) error {
+						return errors.New("foo")
+					},
+					portMock: func() int {
+						return 2002
+					},
+				},
+				logger: zap.NewNop(),
+			},
+			ctx:          nil,
+			logger:       zap.NewNop(),
+			inputPath:    "/tests/test/testdata/libreoffice/sample1.docx",
+			expectPDFErr: true,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			defer func() {
+				if tc.teardown == nil {
+					return
+				}
+
+				err := tc.teardown(tc.mod)
+				if err != nil {
+					t.Errorf("expected no error from tc.teardown(), but got: %v", err)
+				}
+			}()
+
+			outputDir, err := gotenberg.MkdirAll()
+			if err != nil {
+				t.Fatalf("expected no error from gotenberg.MkdirAll(), but got: %v", err)
+			}
+
+			defer func() {
+				err := os.RemoveAll(outputDir)
+				if err != nil {
+					t.Errorf("expected no error from os.RemoveAll(), but got: %v", err)
+				}
+			}()
+
+			err = tc.mod.PDF(tc.ctx, tc.logger, tc.inputPath, outputDir+"/foo.pdf", tc.options)
+
+			if tc.expectPDFErr && err == nil {
+				t.Fatalf("expected mod.PDF() error, but got none")
+			}
+
+			if !tc.expectPDFErr && err != nil {
+				t.Fatalf("expected no error from mod.PDF(), but got: %v", err)
+			}
+		})
+	}
+}
+
+func TestUNO_Extensions(t *testing.T) {
+	mod := new(UNO)
+	extensions := mod.Extensions()
+
+	actual := len(extensions)
+	expect := 76
+
+	if actual != expect {
+		t.Errorf("expected %d extensions, but got %d", expect, actual)
+	}
+}
+
+func TestUNO_UNO(t *testing.T) {
+	mod := new(UNO)
+
+	_, err := mod.UNO()
+	if err != nil {
+		t.Errorf("expected no error from mod.UNO(), but got: %v", err)
+	}
+}
+
+type listenerMock struct {
+	startMock   func(logger *zap.Logger) error
+	stopMock    func(logger *zap.Logger) error
+	lockMock    func(ctx context.Context, logger *zap.Logger) error
+	unlockMock  func(logger *zap.Logger) error
+	portMock    func() int
+	queueMock   func() int
+	healthyMock func() bool
+}
+
+func (listener listenerMock) start(logger *zap.Logger) error {
+	return listener.startMock(logger)
+}
+
+func (listener listenerMock) stop(logger *zap.Logger) error {
+	return listener.stopMock(logger)
+}
+
+func (listener listenerMock) lock(ctx context.Context, logger *zap.Logger) error {
+	return listener.lockMock(ctx, logger)
+}
+
+func (listener listenerMock) unlock(logger *zap.Logger) error {
+	return listener.unlockMock(logger)
+}
+
+func (listener listenerMock) port() int {
+	return listener.portMock()
+}
+
+func (listener listenerMock) queue() int {
+	return listener.queueMock()
+}
+
+func (listener listenerMock) healthy() bool {
+	return listener.healthyMock()
+}
+
+// Interface guards.
+var (
+	_ listener = (*listenerMock)(nil)
+)

pkg/modules/libreoffice/unoconv/doc.go

@@ -1,2 +0,0 @@
-// Package unoconv provides a module which abstracts the CLI tool unoconv.
-package unoconv

pkg/modules/libreoffice/unoconv/unoconv.go

@@ -1,482 +0,0 @@
-package unoconv
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"os"
-	"strings"
-	"sync"
-
-	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
-	flag "github.com/spf13/pflag"
-	"go.uber.org/zap"
-)
-
-func init() {
-	gotenberg.MustRegisterModule(Unoconv{})
-}
-
-// ErrMalformedPageRanges happens if the page ranges option cannot be
-// interpreted by LibreOffice.
-var ErrMalformedPageRanges = errors.New("page ranges are malformed")
-
-// Unoconv is a module which provides an API to interact with unoconv.
-type Unoconv struct {
-	binPath         string
-	disableListener bool
-
-	listenerCmd  gotenberg.Cmd
-	listenerPort int
-	logger       *zap.Logger
-}
-
-// Options gathers available options when converting a document to PDF.
-type Options struct {
-	// Landscape allows to change the orientation of the resulting PDF.
-	// Optional.
-	Landscape bool
-
-	// PageRanges allows to select the pages to convert.
-	// TODO: should prefer a method form PDFEngine.
-	// Optional.
-	PageRanges string
-
-	// PDFArchive allows to convert the resulting PDF to PDF/A-1a.
-	// In a module, prefer the Convert method from the gotenberg.PDFEngine
-	// interface.
-	// Optional.
-	PDFArchive bool
-}
-
-// API is an abstraction on top of unoconv.
-//
-// See https://github.com/unoconv/unoconv.
-type API interface {
-	PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error
-	Extensions() []string
-}
-
-// Provider is a module interface which exposes a method for creating an API
-// for other modules.
-//
-//	func (m *YourModule) Provision(ctx *gotenberg.Context) error {
-//		provider, _ := ctx.Module(new(unoconv.Provider))
-//		uno, _      := provider.(unoconv.Provider).Unoconv()
-//	}
-type Provider interface {
-	Unoconv() (API, error)
-}
-
-// Descriptor returns a Unoconv's module descriptor.
-func (Unoconv) Descriptor() gotenberg.ModuleDescriptor {
-	return gotenberg.ModuleDescriptor{
-		ID: "unoconv",
-		FlagSet: func() *flag.FlagSet {
-			fs := flag.NewFlagSet("unoconv", flag.ExitOnError)
-			fs.Bool("unoconv-disable-listener", false, "Do not start a unoconv listener - save resources in detriment of performance")
-
-			return fs
-		}(),
-		New: func() gotenberg.Module { return new(Unoconv) },
-	}
-}
-
-// Provision sets the module properties. It returns an error if the environment
-// variable UNOCONV_BIN_PATH is not set.
-func (mod *Unoconv) Provision(ctx *gotenberg.Context) error {
-	flags := ctx.ParsedFlags()
-	mod.disableListener = flags.MustBool("unoconv-disable-listener")
-
-	binPath, ok := os.LookupEnv("UNOCONV_BIN_PATH")
-	if !ok {
-		return errors.New("UNOCONV_BIN_PATH environment variable is not set")
-	}
-
-	mod.binPath = binPath
-
-	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
-	if err != nil {
-		return fmt.Errorf("get logger provider: %w", err)
-	}
-
-	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(mod)
-	if err != nil {
-		return fmt.Errorf("get logger: %w", err)
-	}
-
-	mod.logger = logger
-
-	return nil
-}
-
-// Validate validates the module properties.
-func (mod Unoconv) Validate() error {
-	_, err := os.Stat(mod.binPath)
-	if os.IsNotExist(err) {
-		return fmt.Errorf("unoconv binary path does not exist: %w", err)
-	}
-
-	return nil
-}
-
-func (mod *Unoconv) Start() error {
-	if mod.disableListener {
-		return nil
-	}
-
-	port, err := freePort(mod.logger)
-	if err != nil {
-		return fmt.Errorf("get free port: %w", err)
-	}
-
-	mod.listenerPort = port
-
-	args := []string{
-		"--listener",
-		"--user-profile",
-		// Just to make sure LibreOffice does not leak files in an unknown
-		// directory. The directory will be removed anyway by the garbage
-		// collector.
-		fmt.Sprintf("//%s", gotenberg.NewDirPath()),
-		"--port",
-		fmt.Sprintf("%d", mod.listenerPort),
-	}
-
-	checkedEntry := mod.logger.Check(zap.DebugLevel, "check for debug level before setting high verbosity")
-	if checkedEntry != nil {
-		args = append(args, "-vvv")
-	}
-
-	mod.listenerCmd = gotenberg.Command(mod.logger, mod.binPath, args...)
-
-	err = mod.listenerCmd.Start()
-	if err != nil {
-		return fmt.Errorf("start unoconv listener: %w", err)
-	}
-
-	listenerActiveInstancesCountMu.Lock()
-	listenerActiveInstancesCount += 1
-	listenerActiveInstancesCountMu.Unlock()
-
-	return nil
-}
-
-// StartupMessage returns a custom startup message.
-func (mod Unoconv) StartupMessage() string {
-	if mod.disableListener {
-		return "listener disabled"
-	}
-
-	return fmt.Sprintf("listener started on port %d", mod.listenerPort)
-}
-
-// Stop stops the HTTP server.
-func (mod *Unoconv) Stop(ctx context.Context) error {
-	if mod.disableListener {
-		return nil
-	}
-
-	_, ok := ctx.Deadline()
-	if !ok {
-		return errors.New("no context dead line")
-	}
-
-	// Block until the context is done so that other module may gracefully stop
-	// before we do a shutdown cleanup.
-	mod.logger.Debug("wait for the end of grace duration")
-
-	<-ctx.Done()
-
-	err := mod.listenerCmd.Kill()
-	if err != nil {
-		return fmt.Errorf("kill unoconv listener: %w", err)
-	}
-
-	listenerActiveInstancesCountMu.Lock()
-	listenerActiveInstancesCount -= 1
-	listenerActiveInstancesCountMu.Unlock()
-
-	return nil
-}
-
-// Metrics returns the metrics.
-func (mod Unoconv) Metrics() ([]gotenberg.Metric, error) {
-	return []gotenberg.Metric{
-		{
-			Name:        "unoconv_active_instances_count",
-			Description: "Current number of active unoconv instances.",
-			Read: func() float64 {
-				activeInstancesCountMu.RLock()
-				defer activeInstancesCountMu.RUnlock()
-
-				return activeInstancesCount
-			},
-		},
-		{
-			Name:        "unoconv_listener_active_instances_count",
-			Description: "Current number of active unoconv listener instances.",
-			Read: func() float64 {
-				listenerActiveInstancesCountMu.RLock()
-				defer listenerActiveInstancesCountMu.RUnlock()
-
-				return listenerActiveInstancesCount
-			},
-		},
-		{
-			Name:        "unoconv_listener_queue_length",
-			Description: "Current number of processes in the queue.",
-			Read: func() float64 {
-				listenerQueueLengthMu.RLock()
-				defer listenerQueueLengthMu.RUnlock()
-
-				return listenerQueueLength
-			},
-		},
-	}, nil
-}
-
-// Unoconv returns an API for interacting with unoconv.
-func (mod *Unoconv) Unoconv() (API, error) {
-	return mod, nil
-}
-
-// PDF converts a document to PDF.
-//
-// In stateless mode, it creates a dedicated LibreOffice instance thanks to a
-// custom user profile directory and a free port. Substantial calls to this
-// method may increase CPU and memory usage drastically. In such a scenario,
-// the given context may also be done before the end of the conversion.
-//
-// In listener mode, it calls the unoconv listener to interact with
-// LibreOffice, improving substantially the performance. However, it cannot
-// perform parallel operations and have to wait for the lock to be available.
-func (mod Unoconv) PDF(ctx context.Context, logger *zap.Logger, inputPath, outputPath string, options Options) error {
-	args := []string{
-		"--format",
-		"pdf",
-	}
-
-	var userProfileDirPath string
-
-	if mod.disableListener {
-		port, err := freePort(logger)
-		if err != nil {
-			return fmt.Errorf("get free port: %w", err)
-		}
-
-		userProfileDirPath = gotenberg.NewDirPath()
-
-		args = append(args,
-			"--port",
-			fmt.Sprintf("%d", port),
-			"--user-profile",
-			fmt.Sprintf("//%s", userProfileDirPath),
-		)
-	} else {
-		args = append(args, "--port", fmt.Sprintf("%d", mod.listenerPort))
-	}
-
-	checkedEntry := logger.Check(zap.DebugLevel, "check for debug level before setting high verbosity")
-	if checkedEntry != nil {
-		args = append(args, "-vvv")
-	}
-
-	if options.Landscape {
-		args = append(args, "--printer", "PaperOrientation=landscape")
-	}
-
-	if options.PageRanges != "" {
-		args = append(args, "--export", fmt.Sprintf("PageRange=%s", options.PageRanges))
-	}
-
-	if options.PDFArchive {
-		args = append(args, "--export", "SelectPdfVersion=1")
-	}
-
-	args = append(args, "--output", outputPath, inputPath)
-
-	if !mod.disableListener {
-		listenerQueueLengthMu.Lock()
-		listenerQueueLength += 1
-		listenerQueueLengthMu.Unlock()
-
-		select {
-		case listenerLock <- struct{}{}:
-			logger.Debug("unoconv lock acquired")
-
-			listenerQueueLengthMu.Lock()
-			listenerQueueLength -= 1
-			listenerQueueLengthMu.Unlock()
-
-			break
-		case <-ctx.Done():
-			logger.Debug("failed to acquire the unoconv lock before deadline")
-
-			listenerQueueLengthMu.Lock()
-			listenerQueueLength -= 1
-			listenerQueueLengthMu.Unlock()
-
-			return fmt.Errorf("acquire unoconv lock: %w", ctx.Err())
-		}
-
-		defer func() {
-			<-listenerLock
-			logger.Debug("unoconv lock released")
-		}()
-	}
-
-	cmd, err := gotenberg.CommandContext(ctx, logger, mod.binPath, args...)
-	if err != nil {
-		return fmt.Errorf("create unoconv command: %w", err)
-	}
-
-	logger.Debug(fmt.Sprintf("print to PDF with: %+v", options))
-
-	activeInstancesCountMu.Lock()
-	activeInstancesCount += 1
-	activeInstancesCountMu.Unlock()
-
-	err = cmd.Exec()
-
-	activeInstancesCountMu.Lock()
-	activeInstancesCount -= 1
-	activeInstancesCountMu.Unlock()
-
-	if mod.disableListener {
-		// Always remove the user profile directory created by LibreOffice.
-		// See https://github.com/gotenberg/gotenberg/issues/192.
-		go func() {
-			logger.Debug(fmt.Sprintf("remove user profile directory '%s'", userProfileDirPath))
-
-			err := os.RemoveAll(userProfileDirPath)
-			if err != nil {
-				logger.Error(fmt.Sprintf("remove user profile directory: %s", err))
-			}
-		}()
-	}
-
-	if err == nil {
-		return nil
-	}
-
-	// Unoconv/LibreOffice errors are not explicit.
-	// That's why we have to make an educated guess according to the exit code
-	// and given inputs.
-
-	if strings.Contains(err.Error(), "exit status 5") && options.PageRanges != "" {
-		return ErrMalformedPageRanges
-	}
-
-	// Possible errors:
-	// 1. Unoconv/LibreOffice failed for some reason.
-	// 2. Context done.
-	//
-	// On the second scenario, LibreOffice might not had time to remove some of
-	// its temporary files, as it has been killed without warning. The garbage
-	// collector will delete them for us (if the module is loaded).
-	return fmt.Errorf("unoconv PDF: %w", err)
-}
-
-// Extensions returns the file extensions available with unoconv.
-func (mod Unoconv) Extensions() []string {
-	return []string{
-		".bib",
-		".doc",
-		".xml",
-		".docx",
-		".fodt",
-		".html",
-		".ltx",
-		".txt",
-		".odt",
-		".ott",
-		".pdb",
-		".pdf",
-		".psw",
-		".rtf",
-		".sdw",
-		".stw",
-		".sxw",
-		".uot",
-		".vor",
-		".wps",
-		".epub",
-		".png",
-		".bmp",
-		".emf",
-		".eps",
-		".fodg",
-		".gif",
-		".jpg",
-		".jpeg",
-		".met",
-		".odd",
-		".otg",
-		".pbm",
-		".pct",
-		".pgm",
-		".ppm",
-		".ras",
-		".std",
-		".svg",
-		".svm",
-		".swf",
-		".sxd",
-		".sxw",
-		".tif",
-		".tiff",
-		".xhtml",
-		".xpm",
-		".odp",
-		".fodp",
-		".potm",
-		".pot",
-		".pptx",
-		".pps",
-		".ppt",
-		".pwp",
-		".sda",
-		".sdd",
-		".sti",
-		".sxi",
-		".uop",
-		".wmf",
-		".csv",
-		".dbf",
-		".dif",
-		".fods",
-		".ods",
-		".ots",
-		".pxl",
-		".sdc",
-		".slk",
-		".stc",
-		".sxc",
-		".uos",
-		".xls",
-		".xlt",
-		".xlsx",
-	}
-}
-
-var (
-	listenerLock                   = make(chan struct{}, 1)
-	listenerQueueLength            float64
-	listenerQueueLengthMu          sync.RWMutex
-	listenerActiveInstancesCount   float64
-	listenerActiveInstancesCountMu sync.RWMutex
-	activeInstancesCount           float64
-	activeInstancesCountMu         sync.RWMutex
-)
-
-// Interface guards.
-var (
-	_ gotenberg.Module          = (*Unoconv)(nil)
-	_ gotenberg.Provisioner     = (*Unoconv)(nil)
-	_ gotenberg.Validator       = (*Unoconv)(nil)
-	_ gotenberg.App             = (*Unoconv)(nil)
-	_ gotenberg.MetricsProvider = (*Unoconv)(nil)
-	_ API                       = (*Unoconv)(nil)
-	_ Provider                  = (*Unoconv)(nil)
-)

pkg/modules/libreoffice/unoconv/unoconv_test.go

@@ -1,453 +0,0 @@
-package unoconv
-
-import (
-	"context"
-	"errors"
-	"os"
-	"reflect"
-	"testing"
-	"time"
-
-	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
-	"go.uber.org/zap"
-)
-
-type ProtoModule struct {
-	descriptor func() gotenberg.ModuleDescriptor
-}
-
-func (mod ProtoModule) Descriptor() gotenberg.ModuleDescriptor {
-	return mod.descriptor()
-}
-
-type ProtoValidator struct {
-	ProtoModule
-	validate func() error
-}
-
-func (mod ProtoValidator) Validate() error {
-	return mod.validate()
-}
-
-type ProtoLoggerProvider struct {
-	ProtoModule
-	logger func(mod gotenberg.Module) (*zap.Logger, error)
-}
-
-func (factory ProtoLoggerProvider) Logger(mod gotenberg.Module) (*zap.Logger, error) {
-	return factory.logger(mod)
-}
-
-func TestUnoconv_Descriptor(t *testing.T) {
-	descriptor := Unoconv{}.Descriptor()
-
-	actual := reflect.TypeOf(descriptor.New())
-	expect := reflect.TypeOf(new(Unoconv))
-
-	if actual != expect {
-		t.Errorf("expected '%'s' but got '%s'", expect, actual)
-	}
-}
-
-func TestUnoconv_Provision(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       *gotenberg.Context
-		expectErr bool
-	}{
-		{
-			ctx: gotenberg.NewContext(
-				gotenberg.ParsedFlags{FlagSet: new(Unoconv).Descriptor().FlagSet},
-				make([]gotenberg.ModuleDescriptor, 0),
-			),
-			expectErr: true,
-		},
-		{
-			ctx: func() *gotenberg.Context {
-				mod := struct {
-					ProtoLoggerProvider
-				}{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
-				}
-				mod.logger = func(mod gotenberg.Module) (*zap.Logger, error) { return nil, errors.New("foo") }
-
-				return gotenberg.NewContext(
-					gotenberg.ParsedFlags{
-						FlagSet: new(Unoconv).Descriptor().FlagSet,
-					},
-					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
-					},
-				)
-			}(),
-			expectErr: true,
-		},
-		{
-			ctx: func() *gotenberg.Context {
-				mod := struct {
-					ProtoLoggerProvider
-				}{}
-				mod.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return mod }}
-				}
-				mod.logger = func(mod gotenberg.Module) (*zap.Logger, error) { return zap.NewNop(), nil }
-
-				return gotenberg.NewContext(
-					gotenberg.ParsedFlags{
-						FlagSet: new(Unoconv).Descriptor().FlagSet,
-					},
-					[]gotenberg.ModuleDescriptor{
-						mod.Descriptor(),
-					},
-				)
-			}(),
-		},
-	} {
-		mod := new(Unoconv)
-		err := mod.Provision(tc.ctx)
-
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
-
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
-	}
-}
-
-func TestUnoconv_Validate(t *testing.T) {
-	for i, tc := range []struct {
-		binPath   string
-		expectErr bool
-	}{
-		{
-			expectErr: true,
-		},
-		{
-			binPath:   "/foo",
-			expectErr: true,
-		},
-		{
-			binPath: os.Getenv("UNOCONV_BIN_PATH"),
-		},
-	} {
-		mod := Unoconv{
-			binPath: tc.binPath,
-		}
-
-		err := mod.Validate()
-
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
-
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
-	}
-}
-
-func TestUnoconv_Start(t *testing.T) {
-	for i, tc := range []struct {
-		mod       *Unoconv
-		expectErr bool
-	}{
-		{
-			mod: &Unoconv{
-				disableListener: true,
-				logger:          zap.NewNop(),
-			},
-		},
-		{
-			mod: &Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: false,
-				logger:          zap.NewExample(),
-			},
-		},
-	} {
-		func() {
-			err := tc.mod.Start()
-
-			if tc.expectErr && err == nil {
-				t.Errorf("test %d: expected error but got: %v", i, err)
-			}
-
-			if !tc.expectErr && err != nil {
-				t.Errorf("test %d: expected no error but got: %v", i, err)
-			}
-
-			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(1)*time.Nanosecond)
-			defer cancel()
-
-			err = tc.mod.Stop(ctx)
-			if err != nil {
-				t.Errorf("test %d: expected not error but got: %v", i, err)
-			}
-		}()
-	}
-}
-
-func TestUnoconv_StartupMessage(t *testing.T) {
-	for i, tc := range []struct {
-		disableListener bool
-		expectMessage   string
-	}{
-		{
-			disableListener: true,
-			expectMessage:   "listener disabled",
-		},
-		{
-			expectMessage: "listener started on port 0",
-		},
-	} {
-		mod := Unoconv{
-			disableListener: tc.disableListener,
-		}
-
-		actual := mod.StartupMessage()
-		if actual != tc.expectMessage {
-			t.Errorf("test %d: expected '%s' but got '%s'", i, tc.expectMessage, actual)
-		}
-	}
-}
-
-func TestUnoconv_Stop(t *testing.T) {
-	for i, tc := range []struct {
-		start           bool
-		disableListener bool
-		timeout         time.Duration
-		expectErr       bool
-	}{
-		{
-			disableListener: true,
-		},
-		{
-			expectErr: true,
-		},
-		{
-			start:   true,
-			timeout: time.Duration(1) * time.Nanosecond,
-		},
-	} {
-		func() {
-			mod := &Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: tc.disableListener,
-				logger:          zap.NewNop(),
-			}
-
-			if tc.start {
-				err := mod.Start()
-				if err != nil {
-					t.Fatalf("test %d: expected no error but got: %v", i, err)
-				}
-			}
-
-			var err error
-
-			if tc.timeout == 0 {
-				err = mod.Stop(context.TODO())
-			} else {
-				ctx, cancel := context.WithTimeout(context.Background(), tc.timeout)
-				defer cancel()
-
-				err = mod.Stop(ctx)
-			}
-
-			if tc.expectErr && err == nil {
-				t.Errorf("test %d: expected error but got: %v", i, err)
-			}
-
-			if !tc.expectErr && err != nil {
-				t.Errorf("test %d: expected no error but got: %v", i, err)
-			}
-		}()
-	}
-}
-
-func TestUnoconv_Metrics(t *testing.T) {
-	metrics, err := new(Unoconv).Metrics()
-	if err != nil {
-		t.Fatalf("expected no error but got: %v", err)
-	}
-
-	if len(metrics) != 3 {
-		t.Fatalf("expected %d metrics, but got %d", 1, len(metrics))
-	}
-
-	actual := metrics[0].Read()
-	if actual != 0 {
-		t.Errorf("expected %d unoconv instances, but got %f", 0, actual)
-	}
-
-	actual = metrics[1].Read()
-	if actual != 0 {
-		t.Errorf("expected %d unoconv listener instances, but got %f", 0, actual)
-	}
-
-	actual = metrics[2].Read()
-	if actual != 0 {
-		t.Errorf("expected %d processes in the queue, but got %f", 0, actual)
-	}
-}
-
-func TestUnoconv_Unoconv(t *testing.T) {
-	mod := new(Unoconv)
-
-	_, err := mod.Unoconv()
-	if err != nil {
-		t.Errorf("expected no error but got: %v", err)
-	}
-}
-
-func TestUnoconv_PDF(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       context.Context
-		mod       Unoconv
-		logger    *zap.Logger
-		inputPath string
-		options   Options
-		expectErr bool
-	}{
-		{
-			mod: Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: true,
-			},
-			logger:    zap.NewNop(),
-			expectErr: true,
-		},
-		{
-			ctx: context.Background(),
-			mod: Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: true,
-			},
-			logger:    zap.NewExample(),
-			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
-			options: Options{
-				Landscape:  true,
-				PageRanges: "1-2",
-				PDFArchive: true,
-			},
-		},
-		{
-			ctx: context.Background(),
-			mod: Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: true,
-			},
-			logger:    zap.NewNop(),
-			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
-			options: Options{
-				PageRanges: "foo",
-			},
-			expectErr: true,
-		},
-		{
-			ctx: func() context.Context {
-				ctx, cancel := context.WithCancel(context.TODO())
-				defer cancel()
-
-				return ctx
-			}(),
-			mod: Unoconv{
-				binPath:         os.Getenv("UNOCONV_BIN_PATH"),
-				disableListener: true,
-			},
-			logger:    zap.NewNop(),
-			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
-			expectErr: true,
-		},
-		{
-			ctx: context.Background(),
-			mod: Unoconv{
-				binPath: os.Getenv("UNOCONV_BIN_PATH"),
-				logger:  zap.NewNop(),
-			},
-			logger:    zap.NewNop(),
-			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
-		},
-		{
-			ctx: func() context.Context {
-				ctx, cancel := context.WithCancel(context.TODO())
-				defer cancel()
-
-				return ctx
-			}(),
-			mod: Unoconv{
-				binPath: os.Getenv("UNOCONV_BIN_PATH"),
-				logger:  zap.NewNop(),
-			},
-			logger:    zap.NewNop(),
-			inputPath: "/tests/test/testdata/libreoffice/sample1.docx",
-			expectErr: true,
-		},
-	} {
-		func() {
-			outputDir, err := gotenberg.MkdirAll()
-			if err != nil {
-				t.Fatalf("test %d: expected error but got: %v", i, err)
-			}
-
-			defer func() {
-				err := os.RemoveAll(outputDir)
-				if err != nil {
-					t.Fatalf("test %d: expected no error but got: %v", i, err)
-				}
-			}()
-
-			if !tc.mod.disableListener {
-				err = tc.mod.Start()
-				if err != nil {
-					t.Fatalf("test %d: expected no error but got: %v", i, err)
-				}
-
-				// Let's give it some room to start.
-				time.Sleep(time.Duration(1) * time.Second)
-			}
-
-			err = tc.mod.PDF(tc.ctx, tc.logger, tc.inputPath, outputDir+"/foo.pdf", tc.options)
-
-			if tc.expectErr && err == nil {
-				t.Errorf("test %d: expected error but got: %v", i, err)
-			}
-
-			if !tc.expectErr && err != nil {
-				t.Errorf("test %d: expected no error but got: %v", i, err)
-			}
-
-			if !tc.mod.disableListener {
-				ctx, cancel := context.WithTimeout(context.Background(), time.Duration(1)*time.Nanosecond)
-				defer cancel()
-
-				err = tc.mod.Stop(ctx)
-				if err != nil {
-					t.Fatalf("test %d: expected no error but got: %v", i, err)
-				}
-			}
-		}()
-	}
-}
-
-func TestUnoconv_Extensions(t *testing.T) {
-	mod := new(Unoconv)
-	extensions := mod.Extensions()
-
-	actual := len(extensions)
-	expect := 76
-
-	if actual != expect {
-		t.Errorf("expected %d extensions but got %d", expect, actual)
-	}
-}
-
-// Interface guards.
-var (
-	_ gotenberg.Module         = (*ProtoModule)(nil)
-	_ gotenberg.Validator      = (*ProtoValidator)(nil)
-	_ gotenberg.LoggerProvider = (*ProtoLoggerProvider)(nil)
-	_ gotenberg.Module         = (*ProtoLoggerProvider)(nil)
-)

pkg/modules/pdfengines/multi_test.go

@@ -3,213 +3,178 @@ package pdfengines
 import (
 	"context"
 	"errors"
-	"reflect"
 	"testing"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
 	"go.uber.org/zap"
 )
 
-func TestNewMultiPDFEngines(t *testing.T) {
-	engine1 := &ProtoPDFEngine{
-		merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-			return nil
-		},
-		convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-			return nil
-		},
-	}
-
-	engine2 := &ProtoPDFEngine{
-		merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-			return errors.New("foo")
-		},
-		convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-			return errors.New("foo")
-		},
-	}
-
-	multi := newMultiPDFEngines(engine1, engine2)
-
-	if len(multi.engines) != 2 {
-		t.Fatalf("expected %d engines but got %d", 2, len(multi.engines))
-	}
-
-	if !reflect.DeepEqual(engine1, multi.engines[0]) {
-		t.Errorf("expected %v, but got: %v", engine1, multi.engines[0])
-	}
-
-	if !reflect.DeepEqual(engine2, multi.engines[1]) {
-		t.Errorf("expected %v, but got: %v", engine2, multi.engines[1])
-	}
-}
-
 func TestMultiPDFEngines_Merge(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       context.Context
-		engines   []gotenberg.PDFEngine
-		expectErr bool
+	tests := []struct {
+		name           string
+		engine         *multiPDFEngines
+		ctx            context.Context
+		expectMergeErr bool
 	}{
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return nil
-						},
+			name: "nominal behavior",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return nil
 					},
-				}
-			}(),
+				},
+			),
+			ctx: context.Background(),
 		},
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return errors.New("foo")
-						},
+			name: "at least one engine does not return an error",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return errors.New("foo")
 					},
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return nil
-						},
+				},
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return nil
 					},
-				}
-			}(),
+				},
+			),
+			ctx: context.Background(),
 		},
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return errors.New("foo")
-						},
+			name: "all engines return an error",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return errors.New("foo")
 					},
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return errors.New("bar")
-						},
+				},
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return errors.New("foo")
 					},
-				}
-			}(),
-			expectErr: true,
+				},
+			),
+			ctx:            context.Background(),
+			expectMergeErr: true,
 		},
 		{
+			name: "context expired",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+						return nil
+					},
+				},
+			),
 			ctx: func() context.Context {
-				ctx, cancel := context.WithCancel(context.TODO())
-				defer cancel()
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
 
 				return ctx
 			}(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-							return nil
-						},
-					},
-				}
-			}(),
-			expectErr: true,
+			expectMergeErr: true,
 		},
-	} {
-		multi := newMultiPDFEngines(tc.engines...)
-		err := multi.Merge(tc.ctx, nil, nil, "")
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.engine.Merge(tc.ctx, zap.NewNop(), nil, "")
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectMergeErr && err == nil {
+				t.Errorf("expected engine.Merge() error, but got none")
+			}
+
+			if !tc.expectMergeErr && err != nil {
+				t.Errorf("expected no error from engine.Merge(), but got: %v", err)
+			}
+		})
 	}
 }
 
 func TestMultiPDFEngines_Convert(t *testing.T) {
-	for i, tc := range []struct {
-		ctx       context.Context
-		engines   []gotenberg.PDFEngine
-		expectErr bool
+	tests := []struct {
+		name             string
+		engine           *multiPDFEngines
+		ctx              context.Context
+		expectConvertErr bool
 	}{
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return nil
-						},
+			name: "nominal behavior",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return nil
 					},
-				}
-			}(),
+				},
+			),
+			ctx: context.Background(),
 		},
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return errors.New("foo")
-						},
+			name: "at least one engine does not return an error",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return errors.New("foo")
 					},
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return nil
-						},
+				},
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return nil
 					},
-				}
-			}(),
+				},
+			),
+			ctx: context.Background(),
 		},
 		{
-			ctx: context.TODO(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return errors.New("foo")
-						},
+			name: "all engines return an error",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return errors.New("foo")
 					},
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return errors.New("bar")
-						},
+				},
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return errors.New("foo")
 					},
-				}
-			}(),
-			expectErr: true,
+				},
+			),
+			ctx:              context.Background(),
+			expectConvertErr: true,
 		},
 		{
+			name: "context expired",
+			engine: newMultiPDFEngines(
+				gotenberg.PDFEngineMock{
+					ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+						return nil
+					},
+				},
+			),
 			ctx: func() context.Context {
-				ctx, cancel := context.WithCancel(context.TODO())
-				defer cancel()
+				ctx, cancel := context.WithCancel(context.Background())
+				cancel()
 
 				return ctx
 			}(),
-			engines: func() []gotenberg.PDFEngine {
-				return []gotenberg.PDFEngine{
-					ProtoPDFEngine{
-						convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-							return nil
-						},
-					},
-				}
-			}(),
-			expectErr: true,
+			expectConvertErr: true,
 		},
-	} {
-		multi := newMultiPDFEngines(tc.engines...)
-		err := multi.Convert(tc.ctx, nil, "", "", "")
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			err := tc.engine.Convert(tc.ctx, zap.NewNop(), "", "", "")
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			if tc.expectConvertErr && err == nil {
+				t.Errorf("expected engine.Convert() error, but got none")
+			}
+
+			if !tc.expectConvertErr && err != nil {
+				t.Errorf("expected no error from engine.Convert(), but got: %v", err)
+			}
+		})
 	}
 }

pkg/modules/pdfengines/pdfengines.go

@@ -53,6 +53,18 @@ func (mod *PDFEngines) Provision(ctx *gotenberg.Context) error {
 	names := flags.MustStringSlice("pdfengines-engines")
 	mod.disableRoutes = flags.MustBool("pdfengines-disable-routes")
 
+	loggerProvider, err := ctx.Module(new(gotenberg.LoggerProvider))
+	if err != nil {
+		return fmt.Errorf("get logger provider: %w", err)
+	}
+
+	logger, err := loggerProvider.(gotenberg.LoggerProvider).Logger(mod)
+	if err != nil {
+		return fmt.Errorf("get logger: %w", err)
+	}
+
+	logger = logger.Named("pdfengines")
+
 	engines, err := ctx.Modules(new(gotenberg.PDFEngine))
 	if err != nil {
 		return fmt.Errorf("get PDF engines: %w", err)
@@ -68,6 +80,13 @@ func (mod *PDFEngines) Provision(ctx *gotenberg.Context) error {
 		// Selection from user.
 		mod.names = names
 
+		for i, name := range names {
+			logger.Warn("unoconv-pdfengine is deprecated; prefer uno-pdfengine instead")
+			if name == "unoconv-pdfengine" {
+				mod.names[i] = "uno-pdfengine"
+			}
+		}
+
 		return nil
 	}
 

pkg/modules/pdfengines/pdfengines_test.go

@@ -1,7 +1,6 @@
 package pdfengines
 
 import (
-	"context"
 	"errors"
 	"reflect"
 	"strings"
@@ -11,38 +10,7 @@ import (
 	"go.uber.org/zap"
 )
 
-type ProtoModule struct {
-	descriptor func() gotenberg.ModuleDescriptor
-}
-
-func (mod ProtoModule) Descriptor() gotenberg.ModuleDescriptor {
-	return mod.descriptor()
-}
-
-type ProtoValidator struct {
-	ProtoModule
-	validate func() error
-}
-
-func (mod ProtoValidator) Validate() error {
-	return mod.validate()
-}
-
-type ProtoPDFEngine struct {
-	ProtoValidator
-	merge   func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error
-	convert func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error
-}
-
-func (mod ProtoPDFEngine) Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
-	return mod.merge(ctx, logger, inputPaths, outputPath)
-}
-
-func (mod ProtoPDFEngine) Convert(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
-	return mod.convert(ctx, logger, format, inputPath, outputPath)
-}
-
-func TestPDFEngine_Descriptor(t *testing.T) {
+func TestPDFEngines_Descriptor(t *testing.T) {
 	descriptor := PDFEngines{}.Descriptor()
 
 	actual := reflect.TypeOf(descriptor.New())
@@ -53,71 +21,98 @@ func TestPDFEngine_Descriptor(t *testing.T) {
 	}
 }
 
-func TestPDFEngine_Provision(t *testing.T) {
-	for i, tc := range []struct {
-		ctx                *gotenberg.Context
-		expectNames        []string
-		expectEnginesCount int
-		expectErr          bool
+func TestPDFEngines_Provision(t *testing.T) {
+	tests := []struct {
+		name                 string
+		ctx                  *gotenberg.Context
+		expectPDFEngineNames []string
+		expectProvisionErr   bool
 	}{
 		{
+			name: "no selection from user",
 			ctx: func() *gotenberg.Context {
-				engine := struct{ ProtoPDFEngine }{}
-				engine.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine }}
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
+				}
+
+				engine := struct {
+					gotenberg.ModuleMock
+					gotenberg.ValidatorMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return engine }}
+				}
+				engine.ValidateMock = func() error {
+					return nil
 				}
-				engine.validate = func() error { return errors.New("foo") }
 
 				return gotenberg.NewContext(
 					gotenberg.ParsedFlags{
 						FlagSet: new(PDFEngines).Descriptor().FlagSet,
 					},
 					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
 						engine.Descriptor(),
 					},
 				)
 			}(),
-			expectErr: true,
+			expectPDFEngineNames: []string{"bar"},
 		},
 		{
+			name: "selection from user",
 			ctx: func() *gotenberg.Context {
-				engine := struct{ ProtoPDFEngine }{}
-				engine.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine }}
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
 				}
-				engine.validate = func() error { return nil }
 
-				return gotenberg.NewContext(
-					gotenberg.ParsedFlags{
-						FlagSet: new(PDFEngines).Descriptor().FlagSet,
-					},
-					[]gotenberg.ModuleDescriptor{
-						engine.Descriptor(),
-					},
-				)
-			}(),
-			expectNames:        []string{"foo"},
-			expectEnginesCount: 1,
-		},
-		{
-			ctx: func() *gotenberg.Context {
-				engine1 := struct{ ProtoPDFEngine }{}
-				engine1.descriptor = func() gotenberg.ModuleDescriptor {
+				engine1 := struct {
+					gotenberg.ModuleMock
+					gotenberg.ValidatorMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine1.DescriptorMock = func() gotenberg.ModuleDescriptor {
 					return gotenberg.ModuleDescriptor{ID: "a", New: func() gotenberg.Module { return engine1 }}
 				}
-				engine1.validate = func() error { return nil }
+				engine1.ValidateMock = func() error {
+					return nil
+				}
 
-				engine2 := struct{ ProtoPDFEngine }{}
-				engine2.descriptor = func() gotenberg.ModuleDescriptor {
+				engine2 := struct {
+					gotenberg.ModuleMock
+					gotenberg.ValidatorMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine2.DescriptorMock = func() gotenberg.ModuleDescriptor {
 					return gotenberg.ModuleDescriptor{ID: "b", New: func() gotenberg.Module { return engine2 }}
 				}
-				engine2.validate = func() error { return nil }
+				engine2.ValidateMock = func() error {
+					return nil
+				}
 
 				fs := new(PDFEngines).Descriptor().FlagSet
 				err := fs.Parse([]string{"--pdfengines-engines=b", "--pdfengines-engines=a"})
 
 				if err != nil {
-					t.Fatalf("expected no error but got: %v", err)
+					t.Fatalf("expected no error from fs.Parse(), but got: %v", err)
 				}
 
 				return gotenberg.NewContext(
@@ -125,33 +120,47 @@ func TestPDFEngine_Provision(t *testing.T) {
 						FlagSet: fs,
 					},
 					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
 						engine1.Descriptor(),
 						engine2.Descriptor(),
 					},
 				)
 			}(),
-			expectNames:        []string{"b", "a"},
-			expectEnginesCount: 2,
+			expectPDFEngineNames: []string{"b", "a"},
 		},
 		{
+			name: "user select deprecated unoconv-pdfengine",
 			ctx: func() *gotenberg.Context {
-				engine1 := struct{ ProtoPDFEngine }{}
-				engine1.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "a", New: func() gotenberg.Module { return engine1 }}
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
 				}
-				engine1.validate = func() error { return nil }
 
-				engine2 := struct{ ProtoPDFEngine }{}
-				engine2.descriptor = func() gotenberg.ModuleDescriptor {
-					return gotenberg.ModuleDescriptor{ID: "b", New: func() gotenberg.Module { return engine2 }}
+				engine := struct {
+					gotenberg.ModuleMock
+					gotenberg.ValidatorMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "uno-pdfengine", New: func() gotenberg.Module { return engine }}
+				}
+				engine.ValidateMock = func() error {
+					return nil
 				}
-				engine2.validate = func() error { return nil }
 
 				fs := new(PDFEngines).Descriptor().FlagSet
-				err := fs.Parse([]string{"--pdfengines-engines=b"})
+				err := fs.Parse([]string{"--pdfengines-engines=unoconv-pdfengine"})
 
 				if err != nil {
-					t.Fatalf("expected error but got: %v", err)
+					t.Fatalf("expected no error from fs.Parse(), but got: %v", err)
 				}
 
 				return gotenberg.NewContext(
@@ -159,56 +168,136 @@ func TestPDFEngine_Provision(t *testing.T) {
 						FlagSet: fs,
 					},
 					[]gotenberg.ModuleDescriptor{
-						engine1.Descriptor(),
-						engine2.Descriptor(),
+						provider.Descriptor(),
+						engine.Descriptor(),
 					},
 				)
 			}(),
-			expectNames:        []string{"b"},
-			expectEnginesCount: 2,
+			expectPDFEngineNames: []string{"uno-pdfengine"},
 		},
-	} {
-		mod := new(PDFEngines)
-		err := mod.Provision(tc.ctx)
+		{
+			name: "no logger provider",
+			ctx: func() *gotenberg.Context {
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(PDFEngines).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{},
+				)
+			}(),
+			expectProvisionErr: true,
+		},
+		{
+			name: "no logger from logger provider",
+			ctx: func() *gotenberg.Context {
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return nil, errors.New("foo")
+				}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(PDFEngines).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
+					},
+				)
+			}(),
+			expectProvisionErr: true,
+		},
+		{
+			name: "no valid PDF engines",
+			ctx: func() *gotenberg.Context {
+				provider := struct {
+					gotenberg.ModuleMock
+					gotenberg.LoggerProviderMock
+				}{}
+				provider.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module {
+						return provider
+					}}
+				}
+				provider.LoggerMock = func(mod gotenberg.Module) (*zap.Logger, error) {
+					return zap.NewNop(), nil
+				}
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+				engine := struct {
+					gotenberg.ModuleMock
+					gotenberg.ValidatorMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine.DescriptorMock = func() gotenberg.ModuleDescriptor {
+					return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return engine }}
+				}
+				engine.ValidateMock = func() error {
+					return errors.New("foo")
+				}
 
-		if len(tc.expectNames) != len(mod.names) {
-			t.Errorf("test %d: expected %d names but got %d", i, len(tc.expectNames), len(mod.names))
-		}
+				return gotenberg.NewContext(
+					gotenberg.ParsedFlags{
+						FlagSet: new(PDFEngines).Descriptor().FlagSet,
+					},
+					[]gotenberg.ModuleDescriptor{
+						provider.Descriptor(),
+						engine.Descriptor(),
+					},
+				)
+			}(),
+			expectProvisionErr: true,
+		},
+	}
 
-		if tc.expectEnginesCount != len(mod.engines) {
-			t.Errorf("test %d: expected %d engines but got %d", i, tc.expectEnginesCount, len(mod.engines))
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := new(PDFEngines)
+			err := mod.Provision(tc.ctx)
 
-		for index, name := range mod.names {
-			if name != tc.expectNames[index] {
-				t.Errorf("test %d: expected name at index %d to be %s, but got: %s", i, index, name, tc.expectNames[index])
+			if tc.expectProvisionErr && err == nil {
+				t.Fatal("expected mod.Provision() error, but got none")
 			}
-		}
+
+			if !tc.expectProvisionErr && err != nil {
+				t.Fatalf("expected no error from mod.Provision(), but got: %v", err)
+			}
+
+			if len(tc.expectPDFEngineNames) != len(mod.names) {
+				t.Errorf("expected %d names but got %d", len(tc.expectPDFEngineNames), len(mod.names))
+			}
+
+			for index, name := range mod.names {
+				if name != tc.expectPDFEngineNames[index] {
+					t.Errorf("expected name at index %d to be %s, but got: %s", index, name, tc.expectPDFEngineNames[index])
+				}
+			}
+		})
 	}
 }
 
-func TestPDFEngine_Validate(t *testing.T) {
-	for i, tc := range []struct {
-		names     []string
-		engines   []gotenberg.PDFEngine
-		expectErr bool
+func TestPDFEngines_Validate(t *testing.T) {
+	tests := []struct {
+		name              string
+		names             []string
+		engines           []gotenberg.PDFEngine
+		expectValidateErr bool
 	}{
 		{
-			expectErr: true,
-		},
-		{
+			name:  "existing PDF engine",
 			names: []string{"foo"},
 			engines: func() []gotenberg.PDFEngine {
-				engine := struct{ ProtoPDFEngine }{}
-				engine.descriptor = func() gotenberg.ModuleDescriptor {
+				engine := struct {
+					gotenberg.ModuleMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine.DescriptorMock = func() gotenberg.ModuleDescriptor {
 					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine }}
 				}
 
@@ -218,15 +307,22 @@ func TestPDFEngine_Validate(t *testing.T) {
 			}(),
 		},
 		{
+			name:  "non-existing bar PDF engine",
 			names: []string{"foo", "bar", "baz"},
 			engines: func() []gotenberg.PDFEngine {
-				engine1 := struct{ ProtoPDFEngine }{}
-				engine1.descriptor = func() gotenberg.ModuleDescriptor {
+				engine1 := struct {
+					gotenberg.ModuleMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine1.DescriptorMock = func() gotenberg.ModuleDescriptor {
 					return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine1 }}
 				}
 
-				engine2 := struct{ ProtoPDFEngine }{}
-				engine2.descriptor = func() gotenberg.ModuleDescriptor {
+				engine2 := struct {
+					gotenberg.ModuleMock
+					gotenberg.PDFEngineMock
+				}{}
+				engine2.DescriptorMock = func() gotenberg.ModuleDescriptor {
 					return gotenberg.ModuleDescriptor{ID: "baz", New: func() gotenberg.Module { return engine2 }}
 				}
 
@@ -235,21 +331,31 @@ func TestPDFEngine_Validate(t *testing.T) {
 					engine2,
 				}
 			}(),
-			expectErr: true,
+			expectValidateErr: true,
 		},
-	} {
-		mod := new(PDFEngines)
-		mod.names = tc.names
-		mod.engines = tc.engines
-		err := mod.Validate()
+		{
+			name:              "no PDF engine",
+			expectValidateErr: true,
+		},
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			mod := PDFEngines{
+				names:   tc.names,
+				engines: tc.engines,
+			}
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			err := mod.Validate()
+
+			if tc.expectValidateErr && err == nil {
+				t.Errorf("expected mod.Validate() error, but got none")
+			}
+
+			if !tc.expectValidateErr && err != nil {
+				t.Errorf("expected no error from mod.Validate(), but got: %v", err)
+			}
+		})
 	}
 }
 
@@ -259,76 +365,81 @@ func TestPDFEngines_SystemMessages(t *testing.T) {
 
 	messages := mod.SystemMessages()
 	if len(messages) != 1 {
-		t.Errorf("expected one and only one message but got %d", len(messages))
+		t.Errorf("expected one and only one message from mod.SystemMessages(), but got %d", len(messages))
 	}
 
 	expect := strings.Join(mod.names[:], " ")
 	if messages[0] != expect {
-		t.Errorf("expected message '%s' but got '%s'", expect, messages[0])
+		t.Errorf("expected message '%s' from mod.SystemMessages(), but got '%s'", expect, messages[0])
 	}
 }
 
-func TestPDFEngine_PDFEngine(t *testing.T) {
-	mod := new(PDFEngines)
-	mod.names = []string{"foo", "bar"}
-	mod.engines = func() []gotenberg.PDFEngine {
-		engine1 := struct{ ProtoPDFEngine }{}
-		engine1.descriptor = func() gotenberg.ModuleDescriptor {
-			return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine1 }}
-		}
+func TestPDFEngines_PDFEngine(t *testing.T) {
+	mod := PDFEngines{
+		names: []string{"foo", "bar"},
+		engines: func() []gotenberg.PDFEngine {
+			engine1 := struct {
+				gotenberg.ModuleMock
+				gotenberg.PDFEngineMock
+			}{}
+			engine1.DescriptorMock = func() gotenberg.ModuleDescriptor {
+				return gotenberg.ModuleDescriptor{ID: "foo", New: func() gotenberg.Module { return engine1 }}
+			}
 
-		engine2 := struct{ ProtoPDFEngine }{}
-		engine2.descriptor = func() gotenberg.ModuleDescriptor {
-			return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return engine2 }}
-		}
+			engine2 := struct {
+				gotenberg.ModuleMock
+				gotenberg.PDFEngineMock
+			}{}
+			engine2.DescriptorMock = func() gotenberg.ModuleDescriptor {
+				return gotenberg.ModuleDescriptor{ID: "bar", New: func() gotenberg.Module { return engine2 }}
+			}
 
-		return []gotenberg.PDFEngine{
-			engine1,
-			engine2,
-		}
-	}()
+			return []gotenberg.PDFEngine{
+				engine1,
+				engine2,
+			}
+		}(),
+	}
 
 	_, err := mod.PDFEngine()
 	if err != nil {
-		t.Errorf("expected no error but got: %v", err)
+		t.Errorf("expected no error from mod.PDFEngine, but got: %v", err)
 	}
 }
 
-func TestPDFEngine_Routes(t *testing.T) {
-	for i, tc := range []struct {
-		expectRoutes  int
-		disableRoutes bool
+func TestPDFEngines_Routes(t *testing.T) {
+	tests := []struct {
+		name              string
+		mod               PDFEngines
+		expectRoutesCount int
 	}{
 		{
-			expectRoutes: 2,
+			name: "route not disabled",
+			mod: PDFEngines{
+				engines: []gotenberg.PDFEngine{
+					gotenberg.PDFEngineMock{},
+				},
+			},
+			expectRoutesCount: 2,
 		},
 		{
-			disableRoutes: true,
+			name: "route disabled",
+			mod: PDFEngines{
+				disableRoutes: true,
+			},
 		},
-	} {
-		mod := new(PDFEngines)
-		mod.engines = []gotenberg.PDFEngine{
-			struct{ ProtoPDFEngine }{},
-		}
-		mod.disableRoutes = tc.disableRoutes
+	}
 
-		routes, err := mod.Routes()
-		if err != nil {
-			t.Fatalf("test %d: expected no error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			routes, err := tc.mod.Routes()
+			if err != nil {
+				t.Fatalf("expected no error from mod.Routes(), but got: %v", err)
+			}
 
-		if tc.expectRoutes != len(routes) {
-			t.Errorf("test %d: expected %d routes but got %d", i, tc.expectRoutes, len(routes))
-		}
+			if tc.expectRoutesCount != len(routes) {
+				t.Errorf("expected %d routes from mod.Routes(), but got %d", tc.expectRoutesCount, len(routes))
+			}
+		})
 	}
 }
-
-// Interface guards.
-var (
-	_ gotenberg.Module    = (*ProtoModule)(nil)
-	_ gotenberg.Validator = (*ProtoValidator)(nil)
-	_ gotenberg.Module    = (*ProtoValidator)(nil)
-	_ gotenberg.PDFEngine = (*ProtoPDFEngine)(nil)
-	_ gotenberg.Module    = (*ProtoPDFEngine)(nil)
-	_ gotenberg.Validator = (*ProtoPDFEngine)(nil)
-)

pkg/modules/pdfengines/routes_test.go

@@ -13,7 +13,8 @@ import (
 )
 
 func TestMergeHandler(t *testing.T) {
-	for i, tc := range []struct {
+	tests := []struct {
+		name                   string
 		ctx                    *api.MockContext
 		engine                 gotenberg.PDFEngine
 		expectErr              bool
@@ -22,34 +23,75 @@ func TestMergeHandler(t *testing.T) {
 		expectOutputPathsCount int
 	}{
 		{
+			name: "nominal behavior",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+
+				return ctx
+			}(),
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return nil
+				},
+			},
+			expectOutputPathsCount: 1,
+		},
+		{
+			name:             "invalid form data: no PDF",
 			ctx:              &api.MockContext{Context: &api.Context{}},
 			expectErr:        true,
 			expectHTTPErr:    true,
 			expectHTTPStatus: http.StatusBadRequest,
 		},
 		{
+			name: "merge fail",
 			ctx: func() *api.MockContext {
 				ctx := &api.MockContext{Context: &api.Context{}}
-
 				ctx.SetFiles(map[string]string{
 					"foo.pdf": "/foo/foo.pdf",
 				})
 
 				return ctx
 			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return errors.New("foo")
-					},
-				}
-			}(),
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return errors.New("foo")
+				},
+			},
 			expectErr: true,
 		},
 		{
+			name: "nominal behavior with a PDF format",
 			ctx: func() *api.MockContext {
 				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						gotenberg.FormatPDFA1a,
+					},
+				})
 
+				return ctx
+			}(),
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return nil
+				},
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return nil
+				},
+			},
+			expectOutputPathsCount: 1,
+		},
+		{
+			name: "convert to PDF format fail",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
 				ctx.SetFiles(map[string]string{
 					"foo.pdf": "/foo/foo.pdf",
 				})
@@ -61,153 +103,106 @@ func TestMergeHandler(t *testing.T) {
 
 				return ctx
 			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return nil
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return nil
+				},
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return errors.New("foo")
+				},
+			},
+			expectErr: true,
+		},
+		{
+			name: "invalid PDF format",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						"foo",
 					},
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return gotenberg.ErrPDFFormatNotAvailable
-					},
-				}
+				})
+
+				return ctx
 			}(),
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return nil
+				},
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return gotenberg.ErrPDFFormatNotAvailable
+				},
+			},
 			expectErr:        true,
 			expectHTTPErr:    true,
 			expectHTTPStatus: http.StatusBadRequest,
 		},
 		{
+			name: "cannot add output paths",
 			ctx: func() *api.MockContext {
 				ctx := &api.MockContext{Context: &api.Context{}}
-
 				ctx.SetFiles(map[string]string{
 					"foo.pdf": "/foo/foo.pdf",
 				})
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
-
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return nil
-					},
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return errors.New("foo")
-					},
-				}
-			}(),
-			expectErr: true,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
-
 				ctx.SetCancelled(true)
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
 
 				return ctx
 			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return nil
-					},
-				}
-			}(),
+			engine: gotenberg.PDFEngineMock{
+				MergeMock: func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error {
+					return nil
+				},
+			},
 			expectErr: true,
 		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
+	}
 
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			c := echo.New().NewContext(nil, nil)
+			c.Set("context", tc.ctx.Context)
 
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return nil
-					},
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return nil
-					},
-				}
-			}(),
-			expectOutputPathsCount: 1,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
+			err := mergeRoute(tc.engine).Handler(c)
 
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
-
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					merge: func(_ context.Context, _ *zap.Logger, _ []string, _ string) error {
-						return nil
-					},
-				}
-			}(),
-			expectOutputPathsCount: 1,
-		},
-	} {
-		c := echo.New().NewContext(nil, nil)
-		c.Set("context", tc.ctx.Context)
-
-		err := mergeRoute(tc.engine).Handler(c)
-
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
-
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
-
-		var httpErr api.HTTPError
-		isHTTPErr := errors.As(err, &httpErr)
-
-		if tc.expectHTTPErr && !isHTTPErr {
-			t.Errorf("test %d: expected HTTP error but got: %v", i, err)
-		}
-
-		if !tc.expectHTTPErr && isHTTPErr {
-			t.Errorf("test %d: expected no HTTP error but got one: %v", i, httpErr)
-		}
-
-		if err != nil && tc.expectHTTPErr && isHTTPErr {
-			status, _ := httpErr.HTTPError()
-			if status != tc.expectHTTPStatus {
-				t.Errorf("test %d: expected %d HTTP status code but got %d", i, tc.expectHTTPStatus, status)
+			if tc.expectErr && err == nil {
+				t.Fatal("expected error from merge handler, but got none")
 			}
-		}
 
-		if tc.expectOutputPathsCount != len(tc.ctx.OutputPaths()) {
-			t.Errorf("test %d: expected %d output paths but got %d", i, tc.expectOutputPathsCount, len(tc.ctx.OutputPaths()))
-		}
+			if !tc.expectErr && err != nil {
+				t.Fatalf("expected no error from merge handler, but got: %v", err)
+			}
+
+			var httpErr api.HTTPError
+			isHTTPErr := errors.As(err, &httpErr)
+
+			if tc.expectHTTPErr && !isHTTPErr {
+				t.Errorf("expected HTTP error from merge handler, but got: %v", err)
+			}
+
+			if !tc.expectHTTPErr && isHTTPErr {
+				t.Errorf("expected no HTTP error from merge handler, but got one: %v", httpErr)
+			}
+
+			if err != nil && tc.expectHTTPErr && isHTTPErr {
+				status, _ := httpErr.HTTPError()
+				if status != tc.expectHTTPStatus {
+					t.Errorf("expected %d HTTP status code from merge handler, but got %d", tc.expectHTTPStatus, status)
+				}
+			}
+
+			if tc.expectOutputPathsCount != len(tc.ctx.OutputPaths()) {
+				t.Errorf("expected %d output paths from merge handler, but got %d", tc.expectOutputPathsCount, len(tc.ctx.OutputPaths()))
+			}
+		})
 	}
 }
 
 func TestConvertHandler(t *testing.T) {
-	for i, tc := range []struct {
+	tests := []struct {
+		name                   string
 		ctx                    *api.MockContext
 		engine                 gotenberg.PDFEngine
 		expectErr              bool
@@ -216,132 +211,109 @@ func TestConvertHandler(t *testing.T) {
 		expectOutputPathsCount int
 	}{
 		{
-			ctx:              &api.MockContext{Context: &api.Context{}},
-			expectErr:        true,
-			expectHTTPErr:    true,
-			expectHTTPStatus: http.StatusBadRequest,
-		},
-		{
+			name: "nominal behavior",
 			ctx: func() *api.MockContext {
 				ctx := &api.MockContext{Context: &api.Context{}}
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
-
-				return ctx
-			}(),
-			expectErr:        true,
-			expectHTTPErr:    true,
-			expectHTTPStatus: http.StatusBadRequest,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
-
 				ctx.SetFiles(map[string]string{
 					"foo.pdf": "/foo/foo.pdf",
 				})
 				ctx.SetValues(map[string][]string{
 					"pdfFormat": {
-						"foo",
+						gotenberg.FormatPDFA1a,
 					},
 				})
 
 				return ctx
 			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return gotenberg.ErrPDFFormatNotAvailable
-					},
-				}
-			}(),
-			expectErr:        true,
-			expectHTTPErr:    true,
-			expectHTTPStatus: http.StatusBadRequest,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
-
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
-
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return errors.New("foo")
-					},
-				}
-			}(),
-			expectErr: true,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
-
-				ctx.SetCancelled(true)
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
-
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return nil
-					},
-				}
-			}(),
-			expectErr: true,
-		},
-		{
-			ctx: func() *api.MockContext {
-				ctx := &api.MockContext{Context: &api.Context{}}
-
-				ctx.SetFiles(map[string]string{
-					"foo.pdf": "/foo/foo.pdf",
-				})
-				ctx.SetValues(map[string][]string{
-					"pdfFormat": {
-						"foo",
-					},
-				})
-
-				return ctx
-			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return nil
-					},
-				}
-			}(),
+			engine: gotenberg.PDFEngineMock{
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return nil
+				},
+			},
 			expectOutputPathsCount: 1,
 		},
 		{
+			name: "nominal behavior, but with 3 PDFs",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+					"bar.pdf": "/bar/bar.pdf",
+					"baz.pdf": "/baz/baz.pdf",
+				})
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						gotenberg.FormatPDFA1a,
+					},
+				})
+
+				return ctx
+			}(),
+			engine: gotenberg.PDFEngineMock{
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return nil
+				},
+			},
+			expectOutputPathsCount: 3,
+		},
+		{
+			name: "invalid form data: no PDF",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						gotenberg.FormatPDFA1a,
+					},
+				})
+
+				return ctx
+			}(),
+			expectErr:        true,
+			expectHTTPErr:    true,
+			expectHTTPStatus: http.StatusBadRequest,
+		},
+		{
+			name: "invalid form data: no PDF format",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+
+				return ctx
+			}(),
+			expectErr:        true,
+			expectHTTPErr:    true,
+			expectHTTPStatus: http.StatusBadRequest,
+		},
+		{
+			name: "convert to PDF format fail",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						gotenberg.FormatPDFA1a,
+					},
+				})
+
+				return ctx
+			}(),
+			engine: gotenberg.PDFEngineMock{
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return errors.New("foo")
+				},
+			},
+			expectErr: true,
+		},
+		{
+			name: "PDF format not available",
 			ctx: func() *api.MockContext {
 				ctx := &api.MockContext{Context: &api.Context{}}
-
 				ctx.SetFiles(map[string]string{
 					"foo.pdf": "/foo/foo.pdf",
-					"bar.pdf": "/foo/bar.pdf",
 				})
 				ctx.SetValues(map[string][]string{
 					"pdfFormat": {
@@ -351,49 +323,76 @@ func TestConvertHandler(t *testing.T) {
 
 				return ctx
 			}(),
-			engine: func() gotenberg.PDFEngine {
-				return &ProtoPDFEngine{
-					convert: func(_ context.Context, _ *zap.Logger, _, _, _ string) error {
-						return nil
-					},
-				}
-			}(),
-			expectOutputPathsCount: 2,
+			engine: gotenberg.PDFEngineMock{
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return gotenberg.ErrPDFFormatNotAvailable
+				},
+			},
+			expectErr:        true,
+			expectHTTPErr:    true,
+			expectHTTPStatus: http.StatusBadRequest,
 		},
-	} {
-		c := echo.New().NewContext(nil, nil)
-		c.Set("context", tc.ctx.Context)
+		{
+			name: "cannot add output paths",
+			ctx: func() *api.MockContext {
+				ctx := &api.MockContext{Context: &api.Context{}}
+				ctx.SetFiles(map[string]string{
+					"foo.pdf": "/foo/foo.pdf",
+				})
+				ctx.SetValues(map[string][]string{
+					"pdfFormat": {
+						gotenberg.FormatPDFA1a,
+					},
+				})
+				ctx.SetCancelled(true)
 
-		err := convertRoute(tc.engine).Handler(c)
+				return ctx
+			}(),
+			engine: gotenberg.PDFEngineMock{
+				ConvertMock: func(ctx context.Context, logger *zap.Logger, format, inputPath, outputPath string) error {
+					return nil
+				},
+			},
+			expectErr: true,
+		},
+	}
 
-		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
-		}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			c := echo.New().NewContext(nil, nil)
+			c.Set("context", tc.ctx.Context)
 
-		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
-		}
+			err := convertRoute(tc.engine).Handler(c)
 
-		var httpErr api.HTTPError
-		isHTTPErr := errors.As(err, &httpErr)
-
-		if tc.expectHTTPErr && !isHTTPErr {
-			t.Errorf("test %d: expected HTTP error but got: %v", i, err)
-		}
-
-		if !tc.expectHTTPErr && isHTTPErr {
-			t.Errorf("test %d: expected no HTTP error but got one: %v", i, httpErr)
-		}
-
-		if err != nil && tc.expectHTTPErr && isHTTPErr {
-			status, _ := httpErr.HTTPError()
-			if status != tc.expectHTTPStatus {
-				t.Errorf("test %d: expected %d HTTP status code but got %d", i, tc.expectHTTPStatus, status)
+			if tc.expectErr && err == nil {
+				t.Fatal("expected error from convert handler, but got none")
 			}
-		}
 
-		if tc.expectOutputPathsCount != len(tc.ctx.OutputPaths()) {
-			t.Errorf("test %d: expected %d output paths but got %d", i, tc.expectOutputPathsCount, len(tc.ctx.OutputPaths()))
-		}
+			if !tc.expectErr && err != nil {
+				t.Fatalf("expected no error from convert handler, but got: %v", err)
+			}
+
+			var httpErr api.HTTPError
+			isHTTPErr := errors.As(err, &httpErr)
+
+			if tc.expectHTTPErr && !isHTTPErr {
+				t.Errorf("expected HTTP error from convert handler, but got: %v", err)
+			}
+
+			if !tc.expectHTTPErr && isHTTPErr {
+				t.Errorf("expected no HTTP error from convert handler, but got one: %v", httpErr)
+			}
+
+			if err != nil && tc.expectHTTPErr && isHTTPErr {
+				status, _ := httpErr.HTTPError()
+				if status != tc.expectHTTPStatus {
+					t.Errorf("expected %d HTTP status code from convert handler, but got %d", tc.expectHTTPStatus, status)
+				}
+			}
+
+			if tc.expectOutputPathsCount != len(tc.ctx.OutputPaths()) {
+				t.Errorf("expected %d output paths from convert handler, but got %d", tc.expectOutputPathsCount, len(tc.ctx.OutputPaths()))
+			}
+		})
 	}
 }

pkg/modules/pdftk/pdftk.go

@@ -83,7 +83,7 @@ func (engine PDFtk) Merge(ctx context.Context, logger *zap.Logger, inputPaths []
 	activeInstancesCount += 1
 	activeInstancesCountMu.Unlock()
 
-	err = cmd.Exec()
+	_, err = cmd.Exec()
 
 	activeInstancesCountMu.Lock()
 	activeInstancesCount -= 1

pkg/modules/qpdf/qpdf.go

@@ -85,7 +85,7 @@ func (engine QPDF) Merge(ctx context.Context, logger *zap.Logger, inputPaths []s
 	activeInstancesCount += 1
 	activeInstancesCountMu.Unlock()
 
-	err = cmd.Exec()
+	_, err = cmd.Exec()
 
 	activeInstancesCountMu.Lock()
 	activeInstancesCount -= 1

pkg/standard/imports.go

@@ -7,7 +7,7 @@ import (
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/gc"
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice"
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/pdfengine"
-	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/unoconv"
+	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/libreoffice/uno"
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/logging"
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/pdfcpu"
 	_ "github.com/gotenberg/gotenberg/v7/pkg/modules/pdfengines"

test/Dockerfile

@@ -42,4 +42,4 @@ RUN apt-get update -qq &&\
 # Pristine working directory.
 WORKDIR /tests
 
-ENTRYPOINT [ "docker-entrypoint.sh" ]
+ENTRYPOINT [ "/usr/bin/tini", "--", "docker-entrypoint.sh" ]