pkg: simplify code - use time.Until and time.Since

Change-Id: I9c023bd4bb312e05bfbd6b1e33425500bbc5aada

pkg/blobserver/blobhub.go

@@ -99,10 +99,14 @@ func WaitForBlob(storage interface{}, deadline time.Time, blobs []blob.Ref) {
 	if !canLongPoll {
 		tc = time.After(2 * time.Second)
 	}
+
+	t := time.NewTimer(time.Until(deadline))
+	defer t.Stop()
+
 	select {
 	case <-ch:
 	case <-tc:
-	case <-time.After(deadline.Sub(time.Now())):
+	case <-t.C:
 	}
 }
 

pkg/importer/pinboard/pinboard.go

@@ -243,7 +243,7 @@ type apiPost struct {
 }
 
 func (r *run) importBatch(authToken string, parent *importer.Object) (keepTrying bool, err error) {
-	sleepDuration := r.nextAfter.Sub(time.Now())
+	sleepDuration := time.Until(r.nextAfter)
 	// block until we either get canceled or until it is time to run
 	select {
 	case <-r.Context().Done():
@@ -307,7 +307,7 @@ func (r *run) importBatch(authToken string, parent *importer.Object) (keepTrying
 		})
 	}
 
-	log.Printf("pinboard: Imported batch of %d posts in %s.", postCount, time.Now().Sub(start))
+	log.Printf("pinboard: Imported batch of %d posts in %s.", postCount, time.Since(start))
 
 	r.nextCursor = postBatch[postCount-1].Time
 	r.lastPause = pauseInterval