change log method

utils/xlog/ctx.go

@@ -0,0 +1,42 @@
+// Copyright 2019 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package xlog
+
+import (
+	"context"
+)
+
+type key int
+
+const (
+	xlogKey key = 0
+)
+
+func NewContext(ctx context.Context, xl *Logger) context.Context {
+	return context.WithValue(ctx, xlogKey, xl)
+}
+
+func FromContext(ctx context.Context) (xl *Logger, ok bool) {
+	xl, ok = ctx.Value(xlogKey).(*Logger)
+	return
+}
+
+func FromContextSafe(ctx context.Context) *Logger {
+	xl, ok := ctx.Value(xlogKey).(*Logger)
+	if !ok {
+		xl = New()
+	}
+	return xl
+}