Logging: Add output writer wrapper so the default logger can use Logrus

Signed-off-by: Michael Mayer <michael@photoprism.app>

internal/event/init.go

@@ -1,6 +1,7 @@
 package event
 
 import (
+	"log"
 	"os"
 
 	"github.com/sirupsen/logrus"
@@ -24,6 +25,13 @@ func init() {
 		ReportCaller: false,
 	}
 
+	// Default logger shall use Logrus.
+	log.SetFlags(0)
+	log.SetOutput(&LogWriter{
+		Log:   Log,
+		Level: logrus.DebugLevel,
+	})
+
 	// Create dummy audit logger.
 	AuditLog = dummy.NewLogger()
 }

internal/event/log_writer.go

@@ -0,0 +1,24 @@
+package event
+
+import "github.com/sirupsen/logrus"
+
+// LogWriter is an output writer wrapper for using Logrus with the standard logger.
+type LogWriter struct {
+	Log   Logger
+	Level logrus.Level
+}
+
+// Write implements io.Writer.
+func (w *LogWriter) Write(b []byte) (int, error) {
+	n := len(b)
+
+	if n > 0 && b[n-1] == '\n' {
+		b = b[:n-1]
+	}
+
+	if w.Log != nil {
+		w.Log.Log(w.Level, string(b))
+	}
+
+	return n, nil
+}

internal/event/log_writer_test.go

@@ -0,0 +1,11 @@
+package event
+
+import (
+	"log"
+	"testing"
+)
+
+func TestLogWriter(t *testing.T) {
+	l := log.Default()
+	l.Println("Test 123")
+}