https://github.com/google/cayley
Tip revision: be4bcb1bfd297557c4d3f7b37262938f6c843526 authored by Iddan Aaronsohn on 27 June 2019, 08:29:23 UTC
Issued PR comments:
Issued PR comments:
Tip revision: be4bcb1
appengine.go
// Copyright 2014 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 appenginevm
package main
import (
"fmt"
"os"
"time"
"github.com/cayleygraph/cayley/clog"
"github.com/cayleygraph/cayley/graph"
"github.com/cayleygraph/cayley/internal/http"
_ "github.com/cayleygraph/cayley/graph/gaedatastore"
_ "github.com/cayleygraph/cayley/writer"
// Register supported query languages
_ "github.com/cayleygraph/cayley/query/gizmo"
_ "github.com/cayleygraph/cayley/query/graphql"
_ "github.com/cayleygraph/cayley/query/mql"
)
var (
quadFile = ""
quadType = "nquads"
cpuprofile = ""
queryLanguage = "gizmo"
configFile = ""
databasePath = ""
databaseBackend = "gaedatastore"
replicationBackend = "single"
host = "127.0.0.1"
loadSize = 100
port = "64210"
readOnly = false
timeout = 30 * time.Second
)
func configFrom(file string) (*Config, error) {
// Find the file...
if file != "" {
if _, err := os.Stat(file); os.IsNotExist(err) {
return nil, fmt.Errorf("Cannot find specified configuration file", file)
}
} else if _, err := os.Stat("/cayley_appengine.cfg"); err == nil {
file = "/cayley_appengine.cfg"
}
if file == "" {
clog.Infof("Couldn't find a config file appengine.cfg. Going by flag defaults only.")
}
cfg, err := LoadConf(file)
if err != nil {
return nil, err
}
if cfg.DatabasePath == "" {
cfg.DatabasePath = databasePath
}
if cfg.DatabaseType == "" {
cfg.DatabaseType = databaseBackend
}
if cfg.ReplicationType == "" {
cfg.ReplicationType = replicationBackend
}
if cfg.ListenHost == "" {
cfg.ListenHost = host
}
if cfg.ListenPort == "" {
cfg.ListenPort = port
}
if cfg.Timeout == 0 {
cfg.Timeout = timeout
}
if cfg.LoadSize == 0 {
cfg.LoadSize = loadSize
}
cfg.ReadOnly = cfg.ReadOnly || readOnly
return cfg, nil
}
func open(cfg *Config) (*graph.Handle, error) {
qs, err := graph.NewQuadStore(cfg.DatabaseType, cfg.DatabasePath, cfg.DatabaseOptions)
// override error to make it more informative
if os.IsNotExist(err) {
err = fmt.Errorf("file does not exist: %s. Please use with --init or run ./cayley init when it is a new database (see docs for more information)", cfg.DatabasePath)
}
if err != nil {
return nil, err
}
qw, err := graph.NewQuadWriter(cfg.ReplicationType, qs, cfg.ReplicationOptions)
if err != nil {
return nil, err
}
return &graph.Handle{QuadStore: qs, QuadWriter: qw}, nil
}
func init() {
cfg, err := configFrom("cayley_appengine.cfg")
if err != nil {
clog.Fatalf("Error loading config: %v", err)
}
handle, err := open(cfg)
if err != nil {
clog.Fatalf("Error opening database: %v", err)
}
if err := http.SetupRoutes(handle, cfg); err != nil {
clog.Fatalf("Error setting up routes: %v", err)
}
}