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context.go
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context.go
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// Copyright 2021 The Karavel Project
//
// 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 logger
import "context"
type contextKey string
var logKey contextKey = "logger.log"
func WithLogger(ctx context.Context, log Logger) context.Context {
return context.WithValue(ctx, logKey, log)
}
func FromContext(ctx context.Context) Logger {
logger, ok := ctx.Value(logKey).(Logger)
if !ok || logger == nil {
// Create logger on-the-fly, but with a warning message
logger = New(LvlInfo)
logger.Warn("tried to retrieve logger from context but none was found")
}
return logger
}