forked from tgres/tgres
/
log.go
95 lines (81 loc) · 2.13 KB
/
log.go
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//
// Copyright 2015 Gregory Trubetskoy. 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.
package daemon
import (
"fmt"
"log"
"os"
"path/filepath"
"time"
)
var timeNow = func() time.Time {
return time.Now()
}
var osRename = func(a, b string) error {
return os.Rename(a, b)
}
var renameLogFile = func() {
logDir, logFile := filepath.Split(Cfg.LogPath)
filename := timeNow().Format(logFile + "-20060102_150405")
fullpath := filepath.Join(logDir, filename)
log.Printf("Starting new log file, current log archived as: '%s'", fullpath)
osRename(Cfg.LogPath, fullpath)
}
var cycleLogFile = func() {
if logFile != nil {
renameLogFile()
}
file, err := os.OpenFile(Cfg.LogPath, os.O_RDWR|os.O_CREATE|os.O_APPEND|os.O_SYNC, 0666) // open with O_SYNC
if err != nil {
fmt.Fprintf(os.Stderr, "FATAL: Unable to open log file '%s', %s\n", Cfg.LogPath, err)
os.Exit(1)
}
log.SetOutput(file)
if logFile != nil {
logFile.Close()
}
logFile = file
}
var logFileCycler = func() {
cycleLogFile() // Initial cycle
go func() { // Wait for a cycle signal
for {
_ = <-cycleLogCh
if quitting {
// TODO This is not safe - "quitting" is not protected,
// but we should not exit in the middle of a clean up...
return
}
cycleLogFile()
}
}()
go func() { // Periodic cycling
for {
time.Sleep(Cfg.LogCycle.Duration)
cycleLogCh <- 1
if quitting {
return
}
}
}()
}
// Write to both stderr and log
func logFatalf(format string, v ...interface{}) {
fmt.Fprintf(os.Stderr, format, v...)
if Cfg.PidPath != "" && gracefulChildPid == 0 {
os.Remove(Cfg.PidPath)
}
log.Fatalf(format, v...)
}