[SMG-GO] implement a Go SGLang Model Gateway - OpenAI Compatible API Server (#14770)

sgl-model-gateway/bindings/golang/examples/oai_server/logger/logger.go

@@ -0,0 +1,67 @@
+package logger
+
+import (
+	"os"
+	"path/filepath"
+	"time"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+// Init initializes the logger with file and console output
+func Init(logDir, logLevel string) (*zap.Logger, error) {
+	// Ensure log directory exists
+	if err := os.MkdirAll(logDir, 0755); err != nil {
+		return nil, err
+	}
+
+	// Parse log level
+	var level zapcore.Level
+	if err := level.UnmarshalText([]byte(logLevel)); err != nil {
+		level = zapcore.InfoLevel
+	}
+
+	// Create log file path with date
+	logFile := filepath.Join(logDir, "oai_server-"+time.Now().Format("2006-01-02")+".log")
+
+	// File writer with rotation
+	fileWriter := zapcore.AddSync(&lumberjack.Logger{
+		Filename:   logFile,
+		MaxSize:    100, // megabytes
+		MaxBackups: 10,
+		MaxAge:     30, // days
+		Compress:   true,
+	})
+
+	// Console writer
+	consoleWriter := zapcore.AddSync(os.Stdout)
+
+	// Encoder config
+	encoderConfig := zap.NewProductionEncoderConfig()
+	encoderConfig.TimeKey = "timestamp"
+	encoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
+	encoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
+
+	// Create cores
+	fileCore := zapcore.NewCore(
+		zapcore.NewJSONEncoder(encoderConfig),
+		fileWriter,
+		level,
+	)
+
+	consoleCore := zapcore.NewCore(
+		zapcore.NewConsoleEncoder(encoderConfig),
+		consoleWriter,
+		level,
+	)
+
+	// Combine cores
+	core := zapcore.NewTee(fileCore, consoleCore)
+
+	// Create logger
+	logger := zap.New(core, zap.AddCaller(), zap.AddStacktrace(zapcore.ErrorLevel))
+
+	return logger, nil
+}