106 lines
2.7 KiB
Go
106 lines
2.7 KiB
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.
|
|
|
|
package db
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
|
|
"github.com/barakmich/glog"
|
|
|
|
"github.com/google/cayley/graph"
|
|
"github.com/google/cayley/internal/config"
|
|
"github.com/google/cayley/quad"
|
|
)
|
|
|
|
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) {
|
|
glog.Infof("Opening quad store %q at %s", cfg.DatabaseType, cfg.DatabasePath)
|
|
qs, err := graph.NewQuadStore(cfg.DatabaseType, cfg.DatabasePath, cfg.DatabaseOptions)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return qs, nil
|
|
}
|
|
|
|
func OpenQuadWriter(qs graph.QuadStore, cfg *config.Config) (graph.QuadWriter, error) {
|
|
glog.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
|
|
}
|
|
|
|
func Load(qw graph.QuadWriter, cfg *config.Config, dec quad.Unmarshaler) error {
|
|
block := make([]quad.Quad, 0, cfg.LoadSize)
|
|
count := 0
|
|
for {
|
|
t, err := dec.Unmarshal()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
return err
|
|
}
|
|
block = append(block, t)
|
|
if len(block) == cap(block) {
|
|
count += len(block)
|
|
err := qw.AddQuadSet(block)
|
|
if err != nil {
|
|
return fmt.Errorf("db: failed to load data: %v", err)
|
|
}
|
|
block = block[:0]
|
|
if glog.V(2) {
|
|
glog.V(2).Infof("Wrote %d quads.", count)
|
|
}
|
|
}
|
|
}
|
|
count += len(block)
|
|
err := qw.AddQuadSet(block)
|
|
if err != nil {
|
|
return fmt.Errorf("db: failed to load data: %v", err)
|
|
}
|
|
if glog.V(2) {
|
|
glog.V(2).Infof("Wrote %d quads.", count)
|
|
}
|
|
|
|
return nil
|
|
}
|