minor refactoring of const + better timeout handling in pinter package + api package tests

internal/pkg/timeout/timeout.go

@@ -2,7 +2,11 @@ package timeout
 
 import (
 	"context"
+	"fmt"
+	"strings"
 	"time"
+
+	"github.com/thecodingmachine/gotenberg/internal/pkg/standarderror"
 )
 
 // Context creates a context with timeout for
@@ -15,3 +19,29 @@ func Context(seconds float64) (context.Context, context.CancelFunc) {
 func Duration(seconds float64) time.Duration {
 	return time.Duration(1000*seconds) * time.Millisecond
 }
+
+// Err checks if there is an error in the given context
+// and wraps the previous error inside a standarderror.Error.
+func Err(ctx context.Context, previousErr error) error {
+	const op string = "timeout.Err"
+	if previousErr == nil {
+		panic(fmt.Sprintf("%s: previous error should not be nil", op))
+	}
+	err := ctx.Err()
+	if err == nil {
+		return previousErr
+	}
+	if strings.Contains(err.Error(), context.DeadlineExceeded.Error()) {
+		return &standarderror.Error{
+			Code:    standarderror.Timeout,
+			Message: "context has timed out",
+			Op:      op,
+			Err:     previousErr,
+		}
+	}
+	return &standarderror.Error{
+		Message: "context finished with an error",
+		Op:      op,
+		Err:     previousErr,
+	}
+}