fix: align admin behavior and Kratos integrations

pkg/logging/zap.go

@@ -0,0 +1,34 @@
+package logging
+
+import (
+	"log/slog"
+	"os"
+
+	"github.com/go-kratos/kratos/contrib/otel/v3/tracing"
+	kratoslog "github.com/go-kratos/kratos/v3/log"
+	"go.uber.org/zap"
+	"go.uber.org/zap/exp/zapslog"
+	"go.uber.org/zap/zapcore"
+)
+
+// NewZapLogger adapts a Zap core to the slog logger used by Kratos v3.
+// The file layout remains compatible with the administration log viewer.
+func NewZapLogger(root, filename string, attrs ...any) (*slog.Logger, func()) {
+	file := NewDailyWriter(root, filename)
+	encoder := zap.NewProductionEncoderConfig()
+	encoder.EncodeTime = zapcore.ISO8601TimeEncoder
+	encoder.EncodeLevel = zapcore.LowercaseLevelEncoder
+	core := zapcore.NewCore(
+		zapcore.NewJSONEncoder(encoder),
+		zapcore.NewMultiWriteSyncer(zapcore.AddSync(os.Stdout), zapcore.AddSync(file)),
+		zap.NewAtomicLevelAt(zap.InfoLevel),
+	)
+	zapLogger := zap.New(core)
+	handler := zapslog.NewHandler(zapLogger.Core(), zapslog.WithCaller(true), zapslog.AddStacktraceAt(slog.LevelError))
+	logger := kratoslog.NewLogger(handler, kratoslog.WithExtractor(tracing.TraceAttrs)).With(attrs...)
+	cleanup := func() {
+		_ = zapLogger.Sync()
+		_ = file.Close()
+	}
+	return logger, cleanup
+}