asteris-llc/converge

// Copyright © 2016 Asteris, LLC
//
// 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 logging

import (
    "github.com/Sirupsen/logrus"
    "golang.org/x/net/context"
)

var loggerKey = struct{}{}

// WithLogger sets a logger on a context
func WithLogger(ctx context.Context, logger interface{}) context.Context {
    switch t := logger.(type) {
    case *logrus.Logger:
        return context.WithValue(ctx, loggerKey, logrus.NewEntry(t))

    case *logrus.Entry:
        return context.WithValue(ctx, loggerKey, t)

    default:
        return ctx
    }
}

// GetLogger retrieves a logging context context
func GetLogger(ctx context.Context) *logrus.Entry {
    val := ctx.Value(loggerKey)

    if val != nil {
        if entry, ok := val.(*logrus.Entry); ok {
            return entry
        }
    }

    return logrus.WithFields(logrus.Fields{})
}