From 4bafc22f43eaa40192f09a920296a807b97fb753 Mon Sep 17 00:00:00 2001
From: = <=>
Date: Sun, 30 Nov 2014 16:18:10 +0100
Subject: [PATCH] Fixed appengine.go + minor changes

---
 appengine/appengine.go          | 3 +--
 graph/gaedatastore/quadstore.go | 5 ++++-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/appengine/appengine.go b/appengine/appengine.go
index 18508c3..dcd363c 100644
--- a/appengine/appengine.go
+++ b/appengine/appengine.go
@@ -23,7 +23,6 @@ import (
 
 	"github.com/google/cayley/config"
 	"github.com/google/cayley/db"
-	"github.com/google/cayley/graph"
 	"github.com/google/cayley/http"
 
 	_ "github.com/google/cayley/graph/gaedatastore"
@@ -103,5 +102,5 @@ func init() {
 	if err != nil {
 		glog.Fatal(err)
 	}
-	http.SetupRoutes(&handle, cfg)
+	http.SetupRoutes(handle, cfg)
 }
diff --git a/graph/gaedatastore/quadstore.go b/graph/gaedatastore/quadstore.go
index f38047a..7984a2c 100644
--- a/graph/gaedatastore/quadstore.go
+++ b/graph/gaedatastore/quadstore.go
@@ -194,6 +194,9 @@ func (qs *QuadStore) ApplyDeltas(in []graph.Delta) error {
 			toKeep = append(toKeep, d)
 		}
 	}
+	if len(toKeep) == 0 {
+		return nil
+	}
 	err := qs.updateLog(toKeep)
 	if err != nil {
 		glog.Errorf("Updating log failed %v", err)
@@ -480,7 +483,7 @@ func (qs *QuadStore) NodeSize() int64 {
 
 func (qs *QuadStore) Horizon() int64 {
 	if qs.context == nil {
-		glog.Warning("Error fetching horizon, context is nil, graph not correctly initialised")
+		glog.Warning("Warning: HTTP Request context is nil, cannot get horizon from datastore.")
 		return 0
 	}
 	// Query log for last entry...