/usr/share/gocode/src/github.com/tendermint/go-autofile/autofile.go is in golang-github-tendermint-go-autofile-dev 0.0~20170129~0git48b17de-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | package autofile
import (
"os"
"sync"
"time"
. "github.com/tendermint/go-common"
)
/* 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
}
}
n, err = af.file.Write(b)
return
}
func (af *AutoFile) Sync() error {
af.mtx.Lock()
defer af.mtx.Unlock()
return af.file.Sync()
}
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
}
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