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logger.go
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logger.go
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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 log
import (
"fmt"
"os"
"sync"
)
// NewLogger creates a new logger with the default options.
func NewLogger(handler Handler, opts ...Option) *Logger {
logger := &Logger{
Level: InfoLevel,
Handler: handler,
}
for _, opt := range opts {
opt(logger)
}
return logger
}
// Logger implements Stack.
type Logger struct {
mutex sync.RWMutex
Level Level
Handler Handler
middleware []Middleware
stack Handler
}
// Use installs the handler middleware.
func (l *Logger) Use(middleware Middleware) {
l.mutex.Lock()
defer l.mutex.Unlock()
l.middleware = append(l.middleware, middleware)
// the first handler uses the base handler from the logger
// we need to wrap this is a function so the base handler can be
// changed afterwards.
handler := Handler(HandlerFunc(func(entry Entry) error {
return l.Handler.HandleLog(entry)
}))
for i := len(l.middleware) - 1; i >= 0; i-- {
handler = l.middleware[i].Wrap(handler)
}
l.stack = handler
}
// commit comits the entry to the handler.
func (l *Logger) commit(e *entry) {
handler := l.stack
if handler == nil {
handler = l.Handler
}
if handler != nil && l.Level <= e.level {
l.mutex.RLock()
defer l.mutex.RUnlock()
_ = handler.HandleLog(e)
}
if e.Level() == FatalLevel {
os.Exit(1)
}
}
// Debug implements log.Interface.
func (l *Logger) Debug(args ...interface{}) {
l.entry().commit(DebugLevel, fmt.Sprint(args...))
}
// Info implements log.Interface.
func (l *Logger) Info(args ...interface{}) {
l.entry().commit(InfoLevel, fmt.Sprint(args...))
}
// Warn implements log.Interface.
func (l *Logger) Warn(args ...interface{}) {
l.entry().commit(WarnLevel, fmt.Sprint(args...))
}
// Error implements log.Interface.
func (l *Logger) Error(args ...interface{}) {
l.entry().commit(ErrorLevel, fmt.Sprint(args...))
}
// Fatal implements log.Interface.
func (l *Logger) Fatal(args ...interface{}) {
l.entry().commit(FatalLevel, fmt.Sprint(args...))
}
// Debugf implements log.Interface.
func (l *Logger) Debugf(msg string, v ...interface{}) {
l.Debug(fmt.Sprintf(msg, v...))
}
// Infof implements log.Interface.
func (l *Logger) Infof(msg string, v ...interface{}) {
l.Info(fmt.Sprintf(msg, v...))
}
// Warnf implements log.Interface.
func (l *Logger) Warnf(msg string, v ...interface{}) {
l.Warn(fmt.Sprintf(msg, v...))
}
// Errorf implements log.Interface.
func (l *Logger) Errorf(msg string, v ...interface{}) {
l.Error(fmt.Sprintf(msg, v...))
}
// Fatalf implements log.Interface.
func (l *Logger) Fatalf(msg string, v ...interface{}) {
l.Fatal(fmt.Sprintf(msg, v...))
}
// WithField implements log.Interface.
func (l *Logger) WithField(name string, val interface{}) Interface {
return l.entry().WithField(name, val)
}
// WithFields implements log.Interface.
func (l *Logger) WithFields(fields Fielder) Interface {
return l.entry().WithFields(fields)
}
// WithError implements log.Interface.
func (l *Logger) WithError(err error) Interface {
return l.entry().WithError(err)
}
// entry creates a new log entry.
func (l *Logger) entry() *entry {
return &entry{
logger: l,
fields: Fields(),
}
}