Don't ever use UNIX file modification time for event modification time

Doing so can cause inconsistency and cause events to get dropped that
shouldn't. Also add warning to local event side if an event is reported
by the watcher that is not more recent than the event which was
previously the latest local event.

asink/client.go

@@ -141,6 +141,12 @@ func ProcessLocalEvent(globals AsinkGlobals, event *asink.Event) {
 	defer UnlockPath(event)
 	if latestLocal != nil {
 		event.Predecessor = latestLocal.Hash
+
+		if event.Timestamp < latestLocal.Timestamp {
+			fmt.Printf("trying to send event older than latestLocal:\n")
+			fmt.Printf("OLD %+v\n", latestLocal)
+			fmt.Printf("NEW %+v\n", event)
+		}
 	}
 
 	if event.IsUpdate() {

asink/watcher.go

@@ -29,7 +29,7 @@ func StartWatching(watchDir string, fileUpdates chan *asink.Event) {
 			event := new(asink.Event)
 			event.Path = path
 			event.Type = asink.UPDATE
-			event.Timestamp = info.ModTime().UnixNano()
+			event.Timestamp = time.Now().UnixNano()
 			fileUpdates <- event
 		}
 		return nil