forked from cayleygraph/cayley
/
db.go
74 lines (60 loc) · 2.17 KB
/
db.go
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// 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.
package db
import (
"errors"
"fmt"
"os"
"github.com/cayleygraph/cayley/clog"
"github.com/cayleygraph/cayley/graph"
"github.com/cayleygraph/cayley/internal/config"
)
var ErrNotPersistent = errors.New("database type is not persistent")
func Init(cfg *config.Config) error {
if !graph.IsPersistent(cfg.DatabaseType) {
return fmt.Errorf("ignoring unproductive database initialization request: %v", ErrNotPersistent)
}
return graph.InitQuadStore(cfg.DatabaseType, cfg.DatabasePath, cfg.DatabaseOptions)
}
func Open(cfg *config.Config) (*graph.Handle, error) {
qs, err := OpenQuadStore(cfg)
if err != nil {
return nil, err
}
qw, err := OpenQuadWriter(qs, cfg)
if err != nil {
return nil, err
}
return &graph.Handle{QuadStore: qs, QuadWriter: qw}, nil
}
func OpenQuadStore(cfg *config.Config) (graph.QuadStore, error) {
clog.Infof("Opening quad store %q at %s", cfg.DatabaseType, cfg.DatabasePath)
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
}
return qs, nil
}
func OpenQuadWriter(qs graph.QuadStore, cfg *config.Config) (graph.QuadWriter, error) {
clog.Infof("Opening replication method %q", cfg.ReplicationType)
w, err := graph.NewQuadWriter(cfg.ReplicationType, qs, cfg.ReplicationOptions)
if err != nil {
return nil, err
}
return w, nil
}