process load balancing: broken but in progress

internal/pkg/process/soffice.go

@@ -0,0 +1,74 @@
+package process
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/thecodingmachine/gotenberg/internal/pkg/xlog"
+)
+
+const SofficeKey Key = "soffice"
+
+type sofficeProcess struct {
+	id   string
+	host string
+	port int
+}
+
+// NewSofficeProcess returns a LibreOffice
+// headless process.
+func NewSofficeProcess(id, host string, port int) Process {
+	return sofficeProcess{
+		id:   id,
+		host: host,
+		port: port,
+	}
+}
+
+func (p sofficeProcess) ID() string {
+	return p.id
+}
+
+func (p sofficeProcess) Host() string {
+	return p.host
+}
+
+func (p sofficeProcess) Port() int {
+	return p.port
+}
+
+func (p sofficeProcess) binary() string {
+	return "soffice"
+}
+
+func (p sofficeProcess) args() []string {
+	return []string{
+		// see https://ask.libreoffice.org/en/question/42975/how-can-i-run-multiple-instances-of-sofficebin-at-a-time/.
+		fmt.Sprintf("-env:UserInstallation=file:///tmp/%d", p.port),
+		"--headless",
+		"--invisible",
+		"--nocrashreport",
+		"--nodefault",
+		"--nofirststartwizard",
+		"--nologo",
+		"--norestore",
+		fmt.Sprintf("--accept=socket,host=%s,port=%d,tcpNoDelay=1;urp;StarOffice.ComponentContext", p.host, p.port),
+	}
+}
+
+func (p sofficeProcess) warmupTime() time.Duration {
+	return 3 * time.Second
+}
+
+func (p sofficeProcess) viabilityFunc() func(logger xlog.Logger) bool {
+	const op string = "process.sofficeProcess.viabilityFunc"
+	return func(logger xlog.Logger) bool {
+		// TODO find a way to check.
+		return true
+	}
+}
+
+// Compile-time checks to ensure type implements desired interfaces.
+var (
+	_ = Process(new(sofficeProcess))
+)