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logger.go
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logger.go
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package log
// Copyright 2013, David Fisher. All rights reserved.
//
// 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.
//
// author: David Fisher <ddf1991@gmail.com>
// based on previous package by: Cong Ding <dinggnu@gmail.com>
import (
"bitbucket.org/kardianos/osext"
"os"
"path"
"time"
)
// Logger is user-immutable immutable struct which can log to several outputs
type Logger struct {
sinks []Sink // the sinks this logger will log to
verbose bool // gather expensive logging data?
prefix string // static field available to all log sinks under this logger
created time.Time // time when this logger was created
seq uint64 // sequential number of log message, starting at 1
executable string // executable name
}
// New creates a new Logger which logs to all the supplied sinks. The prefix
// argument is passed to all loggers under the field "prefix" with every log
// message. If verbose is true, more expensive runtime fields will be computed
// and passed to loggers. These fields are funcname, lineno, pathname, and
// filename.
func New(prefix string, verbose bool, sinks ...Sink) *Logger {
return &Logger{
sinks: sinks,
verbose: verbose,
prefix: prefix,
created: time.Now(),
seq: 0,
executable: getExecutableName(),
}
}
func getExecutableName() string {
executablePath, err := osext.Executable()
if err != nil {
return "(UNKNOWN)"
} else {
return path.Base(executablePath)
}
}
// NewSimple(sinks...) is equivalent to New("", false, sinks...)
func NewSimple(sinks ...Sink) *Logger {
return New("", false, sinks...)
}
var defaultLogger *Logger
func init() {
defaultLogger = NewSimple(CombinedSink(os.Stdout, BasicFormat, BasicFields))
}