spec out the interface change

cmd/cayleyupgrade/cayleyupgrade.go

@@ -0,0 +1,75 @@
+// 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 (
+	"errors"
+	"flag"
+
+	"github.com/google/cayley/config"
+	_ "github.com/google/cayley/graph"
+
+	// Load all supported backends.
+	"github.com/google/cayley/db"
+	_ "github.com/google/cayley/graph/bolt"
+	_ "github.com/google/cayley/graph/leveldb"
+	_ "github.com/google/cayley/graph/memstore"
+	_ "github.com/google/cayley/graph/mongo"
+	"github.com/google/cayley/internal"
+)
+
+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 {
+	if cfg.DatabasePath == "" {
+		cfg.DatabasePath = *databasePath
+	}
+
+	if cfg.DatabaseType == "" {
+		cfg.DatabaseType = *databaseBackend
+	}
+	return cfg
+}
+
+func main() {
+	flag.Parse()
+	cfg := configFrom(*configFile)
+
+	r, registered := storeRegistry[*databaseBackend]
+	if registered {
+		return r.initFunc(dbpath, opts)
+	}
+	return errors.New("quadstore: name '" + name + "' is not registered")
+	if err != nil {
+		break
+	}
+	if *quadFile != "" {
+		handle, err = db.Open(cfg)
+		if err != nil {
+			break
+		}
+		err = internal.Load(handle.QuadWriter, cfg, *quadFile, *quadType)
+		if err != nil {
+			break
+		}
+		handle.Close()
+	}
+}