func pathExistedBefore(e cp.Event) (bool, error) {
if e.Rev == 0 {
return false, nil
}
sp := e.GetSnapshot()
sp.Rev--
exists, _, err := sp.Exists(e.Path)
return exists, err
}
func newEvent(src cp.Event) (*Event, error) {
event := &Event{
Type: EvUnknown,
Rev: src.Rev,
raw: src,
}
for re, ev := range eventPatterns {
if match := re.FindStringSubmatch(src.Path); match != nil {
switch ev {
case pathApp:
if src.IsSet() {
event.Type = EvAppReg
} else if src.IsDel() {
event.Type = EvAppUnreg
}
event.Path = EventData{App: &match[1]}
case pathRev:
if src.IsSet() {
event.Type = EvRevReg
} else if src.IsDel() {
event.Type = EvRevUnreg
}
event.Path = EventData{App: &match[1], Revision: &match[2]}
case pathProc:
if src.IsSet() {
event.Type = EvProcReg
} else if src.IsDel() {
event.Type = EvProcUnreg
}
event.Path = EventData{App: &match[1], Proc: &match[2]}
case pathProcAttrs:
if !src.IsSet() {
break
}
event.Type = EvProcAttrs
event.Path = EventData{App: &match[1], Proc: &match[2]}
case pathInsRegistered:
if src.IsSet() {
event.Type = EvInsReg
} else if src.IsDel() {
event.Type = EvInsUnreg
}
event.Path = EventData{Instance: &match[1]}
case pathInsStart:
if !src.IsSet() {
break
}
// The start file can be in three different states:
// 1. "" - instance got registered or unclaimed
// 2. "<ip>" - instance got claimed
// 3. "<ip> <host> <port> <tport> - instance got started
if len(bytes.Fields(src.Body)) > 1 {
event.Type = EvInsStart
} else if len(src.Body) == 0 {
// The file is empty, so distinguish between registered and
// unclaimed by whether the file existed before already.
existed, err := pathExistedBefore(src)
if err != nil {
return nil, err
}
if existed {
event.Type = EvInsUnclaim
}
}
event.Path = EventData{Instance: &match[1]}
case pathInsStop:
if !src.IsSet() {
break
}
event.Type = EvInsStop
event.Path = EventData{Instance: &match[1]}
case pathInsStatus:
if !src.IsSet() {
break
}
switch InsStatus(src.Body) {
case InsStatusRunning:
event.Type = EvInsStart
case InsStatusExited:
event.Type = EvInsExit
case InsStatusFailed:
event.Type = EvInsFail
case InsStatusLost:
event.Type = EvInsLost
}
event.Path = EventData{Instance: &match[1]}
}
break
}
}
return event, nil
}