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fields.go
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fields.go
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// Copyright 2013, Cong Ding. 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: Cong Ding <dinggnu@gmail.com>
package logging
import (
"bitbucket.org/kardianos/osext"
"os"
"path"
"runtime"
"sync/atomic"
"time"
)
// The struct for each log record
type record struct {
level Level
seqid uint64
pathname string
filename string
module string
lineno int
funcname string
thread int
process int
message string
time time.Time
}
// This variable maps fields in recordArgs to relavent function signatures
var fields = map[string]func(*Logger, *record) interface{}{
"name": (*Logger).lname, // name of the logger
"seqid": (*Logger).nextSeqid, // sequence number
"levelno": (*Logger).levelno, // level number
"levelname": (*Logger).levelname, // level name
"created": (*Logger).created, // starting time of the logger
"nsecs": (*Logger).nsecs, // nanosecond of the starting time
"time": (*Logger).time, // record created time
"timestamp": (*Logger).timestamp, // timestamp of record
"rtime": (*Logger).rtime, // relative time since started
"filename": (*Logger).filename, // source filename of the caller
"pathname": (*Logger).pathname, // filename with path
"module": (*Logger).module, // executable filename
"lineno": (*Logger).lineno, // line number in source code
"funcname": (*Logger).funcname, // function name of the caller
"thread": (*Logger).thread, // thread id
"process": (*Logger).process, // process id
"message": (*Logger).message, // logger message
}
var runtimeFields = map[string]bool{
"name": false,
"seqid": false,
"levelno": false,
"levelname": false,
"created": false,
"nsecs": false,
"time": false,
"timestamp": false,
"rtime": false,
"filename": true,
"pathname": true,
"module": false,
"lineno": true,
"funcname": true,
"thread": true,
"process": false,
"message": false,
}
// If it fails to get some fields with string type, these fields are set to
// errString value.
const errString = "???"
// GetGoID returns the id of goroutine, which is defined in ./get_go_id.c
func GetGoID() int32
// genRuntime generates the runtime information, including pathname, function
// name, filename, line number.
func genRuntime(r *record) {
calldepth := 5
pc, file, line, ok := runtime.Caller(calldepth)
if ok {
// Generate short function name
fname := runtime.FuncForPC(pc).Name()
fshort := fname
for i := len(fname) - 1; i > 0; i-- {
if fname[i] == '.' {
fshort = fname[i+1:]
break
}
}
r.pathname = file
r.funcname = fshort
r.filename = path.Base(file)
r.lineno = line
} else {
r.pathname = errString
r.funcname = errString
r.filename = errString
// Here we uses -1 rather than 0, because the default value in
// golang is 0 and we should know the value is uninitialized
// or failed to get
r.lineno = -1
}
}
// Logger name
func (logger *Logger) lname(r *record) interface{} {
return logger.name
}
// Next sequence number
func (logger *Logger) nextSeqid(r *record) interface{} {
if r.seqid == 0 {
r.seqid = atomic.AddUint64(&(logger.seqid), 1)
}
return r.seqid
}
// Log level number
func (logger *Logger) levelno(r *record) interface{} {
return int32(r.level)
}
// Log level name
func (logger *Logger) levelname(r *record) interface{} {
return levelNames[r.level]
}
// File name of calling logger, with whole path
func (logger *Logger) pathname(r *record) interface{} {
if r.pathname == "" {
genRuntime(r)
}
return r.pathname
}
// File name of calling logger
func (logger *Logger) filename(r *record) interface{} {
if r.filename == "" {
genRuntime(r)
}
return r.filename
}
// module name
func (logger *Logger) module(r *record) interface{} {
module, _ := osext.Executable()
return path.Base(module)
}
// Line number
func (logger *Logger) lineno(r *record) interface{} {
if r.lineno == 0 {
genRuntime(r)
}
return r.lineno
}
// Function name
func (logger *Logger) funcname(r *record) interface{} {
if r.funcname == "" {
genRuntime(r)
}
return r.funcname
}
// Timestamp of starting time
func (logger *Logger) created(r *record) interface{} {
return logger.startTime.UnixNano()
}
// RFC3339Nano time
func (logger *Logger) time(r *record) interface{} {
if r.time.IsZero() {
r.time = time.Now()
}
return r.time.Format(logger.timeFormat)
}
// Nanosecond of starting time
func (logger *Logger) nsecs(r *record) interface{} {
return logger.startTime.Nanosecond()
}
// Nanosecond timestamp
func (logger *Logger) timestamp(r *record) interface{} {
if r.time.IsZero() {
r.time = time.Now()
}
return r.time.UnixNano()
}
// Nanoseconds since logger created
func (logger *Logger) rtime(r *record) interface{} {
if r.time.IsZero() {
r.time = time.Now()
}
return r.time.Sub(logger.startTime).Nanoseconds()
}
// Thread ID
func (logger *Logger) thread(r *record) interface{} {
if r.thread == 0 {
r.thread = int(GetGoID())
}
return r.thread
}
// Process ID
func (logger *Logger) process(r *record) interface{} {
if r.process == 0 {
r.process = os.Getpid()
}
return r.process
}
// The log message
func (logger *Logger) message(r *record) interface{} {
return r.message
}