use default logger for android and ios

app/log/log.go

@@ -4,6 +4,7 @@ package log
 
 import (
 	"context"
+	"runtime"
 	"sync"
 
 	"v2ray.com/core/common"
@@ -30,6 +31,18 @@ func New(ctx context.Context, config *Config) (*Instance, error) {
 	return g, nil
 }
 
+func isMobile() bool {
+	return runtime.GOOS == "android" || (runtime.GOOS == "darwin" && (runtime.GOARCH == "arm" || runtime.GOARCH == "arm64"))
+}
+
+func createStdLogWriter() log.WriterCreator {
+	if isMobile() {
+		return log.CreateDefaultLogWriter()
+	}
+
+	return log.CreateStdoutLogWriter()
+}
+
 func (g *Instance) initAccessLogger() error {
 	switch g.config.AccessLogType {
 	case LogType_File:
@@ -39,7 +52,7 @@ func (g *Instance) initAccessLogger() error {
 		}
 		g.accessLogger = log.NewLogger(creator)
 	case LogType_Console:
-		g.accessLogger = log.NewLogger(log.CreateStdoutLogWriter())
+		g.accessLogger = log.NewLogger(createStdLogWriter())
 	default:
 	}
 	return nil
@@ -54,7 +67,7 @@ func (g *Instance) initErrorLogger() error {
 		}
 		g.errorLogger = log.NewLogger(creator)
 	case LogType_Console:
-		g.errorLogger = log.NewLogger(log.CreateStdoutLogWriter())
+		g.errorLogger = log.NewLogger(createStdLogWriter())
 	default:
 	}
 	return nil

common/log/logger.go

@@ -119,6 +119,22 @@ func CreateStdoutLogWriter() WriterCreator {
 	}
 }
 
+type defaultLogWriter struct{}
+
+func (defaultLogWriter) Write(b []byte) (int, error) {
+	log.Print(string(b))
+	return len(b), nil
+}
+
+// CreateDefaultLogWriter returns a LogWriterCreator that creates LogWriter to write to default Golang logger.
+func CreateDefaultLogWriter() WriterCreator {
+	return func() Writer {
+		return &consoleLogWriter{
+			logger: log.New(defaultLogWriter{}, "", log.Ldate|log.Ltime),
+		}
+	}
+}
+
 // CreateFileLogWriter returns a LogWriterCreator that creates LogWriter for the given file.
 func CreateFileLogWriter(path string) (WriterCreator, error) {
 	file, err := os.OpenFile(path, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)