401c58426f
* Move nquads into quad. * Create cquads simplified parser in quad. * Move Triple (renamed Quad) to quad. Also made sure mongo actually implements BulkLoader.
104 lines
2.1 KiB
Go
104 lines
2.1 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 (
|
|
"bytes"
|
|
"compress/bzip2"
|
|
"compress/gzip"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
|
|
"github.com/barakmich/glog"
|
|
"github.com/google/cayley/config"
|
|
"github.com/google/cayley/graph"
|
|
"github.com/google/cayley/quad"
|
|
"github.com/google/cayley/quad/nquads"
|
|
)
|
|
|
|
func Load(ts graph.TripleStore, cfg *config.Config, path string) error {
|
|
f, err := os.Open(path)
|
|
if err != nil {
|
|
return fmt.Errorf("could not open file %q: %v", path, err)
|
|
}
|
|
defer f.Close()
|
|
|
|
r, err := decompressor(f)
|
|
if err != nil {
|
|
glog.Fatalln(err)
|
|
}
|
|
|
|
dec := nquads.NewDecoder(r)
|
|
|
|
bulker, canBulk := ts.(graph.BulkLoader)
|
|
if canBulk {
|
|
err = bulker.BulkLoad(dec)
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
if err == graph.ErrCannotBulkLoad {
|
|
err = nil
|
|
}
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
block := make([]*quad.Quad, 0, cfg.LoadSize)
|
|
for {
|
|
t, err := dec.Unmarshal()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
break
|
|
}
|
|
return err
|
|
}
|
|
block = append(block, t)
|
|
if len(block) == cap(block) {
|
|
ts.AddTripleSet(block)
|
|
block = block[:0]
|
|
}
|
|
}
|
|
ts.AddTripleSet(block)
|
|
|
|
return nil
|
|
}
|
|
|
|
const (
|
|
gzipMagic = "\x1f\x8b"
|
|
b2zipMagic = "BZh"
|
|
)
|
|
|
|
type readAtReader interface {
|
|
io.Reader
|
|
io.ReaderAt
|
|
}
|
|
|
|
func decompressor(r readAtReader) (io.Reader, error) {
|
|
var buf [3]byte
|
|
_, err := r.ReadAt(buf[:], 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
switch {
|
|
case bytes.Compare(buf[:2], []byte(gzipMagic)) == 0:
|
|
return gzip.NewReader(r)
|
|
case bytes.Compare(buf[:3], []byte(b2zipMagic)) == 0:
|
|
return bzip2.NewReader(r), nil
|
|
default:
|
|
return r, nil
|
|
}
|
|
}
|