Merge pull request #277 from barakmich/upgrade_db

Add migration tool and use protos in Bolt store

cmd/cayleyupgrade/cayleyupgrade.go

@@ -0,0 +1,79 @@
+// Copyright 2015 The Cayley Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build !appengine
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/barakmich/glog"
+	"github.com/google/cayley/config"
+	"github.com/google/cayley/graph"
+
+	// Load all supported backends.
+
+	_ "github.com/google/cayley/graph/bolt"
+	_ "github.com/google/cayley/graph/leveldb"
+	_ "github.com/google/cayley/graph/memstore"
+	_ "github.com/google/cayley/graph/mongo"
+)
+
+var (
+	configFile      = flag.String("config", "", "Path to an explicit configuration file.")
+	databasePath    = flag.String("dbpath", "/tmp/testdb", "Path to the database.")
+	databaseBackend = flag.String("db", "memstore", "Database Backend.")
+)
+
+func configFrom(file string) *config.Config {
+	// Find the file...
+	if file != "" {
+		if _, err := os.Stat(file); os.IsNotExist(err) {
+			glog.Fatalln("Cannot find specified configuration file", file, ", aborting.")
+		}
+	} else if _, err := os.Stat(os.Getenv("CAYLEY_CFG")); err == nil {
+		file = os.Getenv("CAYLEY_CFG")
+	} else if _, err := os.Stat("/etc/cayley.cfg"); err == nil {
+		file = "/etc/cayley.cfg"
+	}
+	if file == "" {
+		glog.Infoln("Couldn't find a config file in either $CAYLEY_CFG or /etc/cayley.cfg. Going by flag defaults only.")
+	}
+	cfg, err := config.Load(file)
+	if err != nil {
+		glog.Fatalln(err)
+	}
+	if cfg.DatabasePath == "" {
+		cfg.DatabasePath = *databasePath
+	}
+
+	if cfg.DatabaseType == "" {
+		cfg.DatabaseType = *databaseBackend
+	}
+	return cfg
+}
+
+func main() {
+	flag.Parse()
+	cfg := configFrom(*configFile)
+
+	err := graph.UpgradeQuadStore(cfg.DatabaseType, cfg.DatabasePath, nil)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}