You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
2.1 KiB
126 lines
2.1 KiB
package autofile
|
|
|
|
import (
|
|
. "github.com/tendermint/go-common"
|
|
"os"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
/* AutoFile usage
|
|
|
|
// Create/Append to ./autofile_test
|
|
af, err := OpenAutoFile("autofile_test")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// Stream of writes.
|
|
// During this time, the file may be moved e.g. by logRotate.
|
|
for i := 0; i < 60; i++ {
|
|
af.Write([]byte(Fmt("LOOP(%v)", i)))
|
|
time.Sleep(time.Second)
|
|
}
|
|
|
|
// Close the AutoFile
|
|
err = af.Close()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
*/
|
|
|
|
const autoFileOpenDuration = 1000 * time.Millisecond
|
|
|
|
// Automatically closes and re-opens file for writing.
|
|
// This is useful for using a log file with the logrotate tool.
|
|
type AutoFile struct {
|
|
ID string
|
|
Path string
|
|
ticker *time.Ticker
|
|
mtx sync.Mutex
|
|
file *os.File
|
|
}
|
|
|
|
func OpenAutoFile(path string) (af *AutoFile, err error) {
|
|
af = &AutoFile{
|
|
ID: RandStr(12) + ":" + path,
|
|
Path: path,
|
|
ticker: time.NewTicker(autoFileOpenDuration),
|
|
}
|
|
if err = af.openFile(); err != nil {
|
|
return
|
|
}
|
|
go af.processTicks()
|
|
sighupWatchers.addAutoFile(af)
|
|
return
|
|
}
|
|
|
|
func (af *AutoFile) Close() error {
|
|
af.ticker.Stop()
|
|
err := af.closeFile()
|
|
sighupWatchers.removeAutoFile(af)
|
|
return err
|
|
}
|
|
|
|
func (af *AutoFile) processTicks() {
|
|
for {
|
|
_, ok := <-af.ticker.C
|
|
if !ok {
|
|
return // Done.
|
|
}
|
|
af.closeFile()
|
|
}
|
|
}
|
|
|
|
func (af *AutoFile) closeFile() (err error) {
|
|
af.mtx.Lock()
|
|
defer af.mtx.Unlock()
|
|
|
|
file := af.file
|
|
if file == nil {
|
|
return nil
|
|
}
|
|
af.file = nil
|
|
return file.Close()
|
|
}
|
|
|
|
func (af *AutoFile) Write(b []byte) (n int, err error) {
|
|
af.mtx.Lock()
|
|
defer af.mtx.Unlock()
|
|
if af.file == nil {
|
|
if err = af.openFile(); err != nil {
|
|
return
|
|
}
|
|
}
|
|
return af.file.Write(b)
|
|
}
|
|
|
|
func (af *AutoFile) openFile() error {
|
|
file, err := os.OpenFile(af.Path, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0600)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
af.file = file
|
|
return nil
|
|
}
|
|
|
|
func (af *AutoFile) Size() (int64, error) {
|
|
af.mtx.Lock()
|
|
defer af.mtx.Unlock()
|
|
if af.file == nil {
|
|
err := af.openFile()
|
|
if err != nil {
|
|
if err == os.ErrNotExist {
|
|
return 0, nil
|
|
} else {
|
|
return -1, err
|
|
}
|
|
}
|
|
}
|
|
stat, err := af.file.Stat()
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
return stat.Size(), nil
|
|
|
|
}
|