Merge pull request #31 from abicky/make-utern-print-logs-as-many-as-p…

…ossible

Make utern print logs as many as possible

cloudwatch/cloudwatch.go

@@ -153,23 +153,26 @@ func (cwl *Client) Tail(ctx context.Context) error {
 
 func (cwl *Client) tail(ctx context.Context, logGroupName string,
 	start chan struct{}, ch chan *logEvent, errch chan error) error {
-	lastSeenTime := aws.Int64(cwl.config.StartTime.UTC().Unix() * 1000)
+	lastEventTime := aws.Int64(cwl.config.StartTime.UTC().Unix() * 1000)
 
 	fn := func(res *cloudwatchlogs.FilterLogEventsOutput, lastPage bool) bool {
 		for _, event := range res.Events {
 			if cache.Cache.Load(logGroupName, event.EventId) {
 				continue
 			}
-			cache.Cache.Store(logGroupName, event.EventId, event.IngestionTime)
+			cache.Cache.Store(logGroupName, event.EventId, event.Timestamp)
 			ch <- &logEvent{
 				logGroupName: logGroupName,
 				event:        event,
 			}
+
+			if *event.Timestamp > *lastEventTime {
+				lastEventTime = event.Timestamp
+			}
 		}
 
-		if lastPage && len(res.Events) > 0 {
-			lastSeenTime = res.Events[len(res.Events)-1].IngestionTime
-			cache.Cache.Expire(logGroupName, lastSeenTime)
+		if lastPage {
+			cache.Cache.Expire(logGroupName, lastEventTime)
 		}
 
 		return true
@@ -182,7 +185,7 @@ func (cwl *Client) tail(ctx context.Context, logGroupName string,
 		case <-start:
 		}
 
-		streams, err := cwl.ListStreams(ctx, logGroupName, *lastSeenTime)
+		streams, err := cwl.ListStreams(ctx, logGroupName, *lastEventTime)
 		if err != nil {
 			return err
 		}
@@ -205,7 +208,7 @@ func (cwl *Client) tail(ctx context.Context, logGroupName string,
 			LogGroupName:   aws.String(logGroupName),
 			LogStreamNames: streamNames,
 			Interleaved:    aws.Bool(true),
-			StartTime:      lastSeenTime,
+			StartTime:      lastEventTime,
 		}
 		if cwl.config.FilterPattern != "" {
 			input.FilterPattern = aws.String(cwl.config.FilterPattern)