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replayCatchup test

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This commit is contained in:
Ethan Buchman
2016-01-18 15:57:57 -05:00
parent 26f0e2bc2d
commit 273a65724d
5 changed files with 123 additions and 33 deletions
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6
consensus/wal.go
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@ -32,6 +32,8 @@ var _ = wire.RegisterInterface(
// Write ahead logger writes msgs to disk before they are processed.
// Can be used for crash-recovery and deterministic replay
// TODO: currently the wal is overwritten during replay catchup
// give it a mode so it's either reading or appending - must read to end to start appending again
type WAL struct {
fp *os.File
exists bool // if the file already existed (restarted process)
@ -81,9 +83,11 @@ func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
}
// backup until we find the the right line
// current is how far we are from the beginning
for {
current -= 1
if current < 0 {
wal.fp.Seek(0, 0) // back to beginning
return
}
// backup one and read a new byte
@ -95,6 +99,7 @@ func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
return
}
if b[0] == '\n' || len(b) == 0 {
nLines += 1
// read a full line
reader := bufio.NewReader(wal.fp)
lineBytes, _ := reader.ReadBytes('\n')
@ -102,7 +107,6 @@ func (wal *WAL) SeekFromEnd(found func([]byte) bool) (nLines int, err error) {
continue
}
nLines += 1
if found(lineBytes) {
wal.fp.Seek(0, 1) // (?)
wal.fp.Seek(current, 0)