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Don't use io.Seek*, not supported in older versions

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This commit is contained in:
Jae Kwon 2016-10-26 22:19:44 -07:00
parent 539f8f91bd
commit fc31b463b1
1 changed files with 12 additions and 6 deletions
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18
consensus/wal.go
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@ -2,7 +2,6 @@ package consensus
import ( import (
"bufio" "bufio"
"io"
"os" "os"
"time" "time"
@ -103,10 +102,17 @@ func (wal *WAL) Wait() {
<-wal.done <-wal.done
} }
// TODO: remove once we stop supporting older golang version
const (
ioSeekStart = 0
ioSeekCurrent = 1
ioSeekEnd = 2
)
func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) { func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
var current int64 var current int64
// start at the end // start at the end
current, err = wal.fp.Seek(0, io.SeekEnd) current, err = wal.fp.Seek(0, ioSeekEnd)
if err != nil { if err != nil {
return return
} }
@ -116,11 +122,11 @@ func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
for { for {
current -= 1 current -= 1
if current < 0 { if current < 0 {
wal.fp.Seek(0, io.SeekStart) // back to beginning wal.fp.Seek(0, ioSeekStart) // back to beginning
return return
} }
// backup one and read a new byte // backup one and read a new byte
if _, err = wal.fp.Seek(current, io.SeekStart); err != nil { if _, err = wal.fp.Seek(current, ioSeekStart); err != nil {
return return
} }
b := make([]byte, 1) b := make([]byte, 1)
@ -137,8 +143,8 @@ func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
} }
if found(lineBytes) { if found(lineBytes) {
wal.fp.Seek(0, io.SeekCurrent) // (?) wal.fp.Seek(0, ioSeekCurrent) // (?)
wal.fp.Seek(current, io.SeekStart) wal.fp.Seek(current, ioSeekStart)
return return
} }
} }