more consistent formatting of error logs in fcm

server/push/fcm/push_fcm.go

@@ -133,7 +133,7 @@ func sendNotifications(rcpt *push.Receipt, config *configType) {
 
 	data, _ := payloadToData(&rcpt.Payload)
 	if data == nil || data["content"] == "" {
-		// Could not parse payload or empty payload.
+		log.Println("fcm push: could not parse payload or empty payload")
 		return
 	}
 
@@ -151,7 +151,7 @@ func sendNotifications(rcpt *push.Receipt, config *configType) {
 
 	devices, count, err := store.Devices.GetAll(uids...)
 	if err != nil {
-		log.Println("fcm push db error", err)
+		log.Println("fcm push: db error", err)
 		return
 	}
 	if count == 0 {
@@ -202,16 +202,16 @@ func sendNotifications(rcpt *push.Receipt, config *configType) {
 
 					if fcm.IsMismatchedCredential(err) || fcm.IsInvalidArgument(err) {
 						// Config errors
-						log.Println("fcm push failed", err)
+						log.Println("fcm push: failed", err)
 						return
 					}
 
 					if fcm.IsRegistrationTokenNotRegistered(err) {
 						// Token is no longer valid.
 						store.Devices.Delete(uid, d.DeviceId)
-						log.Println("fcm invalid token", err)
+						log.Println("fcm push: invalid token", err)
 					} else {
-						log.Println("fcm push", err)
+						log.Println("fcm push:", err)
 					}
 				}
 			}