// updateXChecksum 更新XChecksum, 在之前该方法前, 需要上锁.
func (lg *logger) updateXChecksum(log []byte) {
lg.xChecksum = calChecksum(lg.xChecksum, log)
_, err := lg.file.WriteAt(utils.Uint32ToRaw(lg.xChecksum), 0)
if err != nil {
panic(err)
}
err = lg.file.Sync()
if err != nil {
panic(err)
}
}
func Create(path string) *logger {
file, err := os.OpenFile(path+SUFFIX_LOG, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
panic(err)
}
xChecksum := utils.Uint32ToRaw(0)
_, err = file.Write(xChecksum)
if err != nil {
panic(err)
}
err = file.Sync()
if err != nil {
panic(err)
}
lg := new(logger)
lg.file = file
lg.xChecksum = 0
return lg
}