41f6d3fd84
I intend to make this configurable, but there is tight connection
between db.Load and db.Open that is getting in the way of that.
Testing on data set 30kmoviedata.cq.gz created by doing:
zcat 30kmoviedata.nq.gz | sed 's/[<>]//g' | gzip -c > 30kmoviedata.cq.gz
The following query is successful:
[{
"type": "/film/film",
"name": null,
"/film/film/directed_by": {
"name": "David Fincher"
},
"/film/film/starring": [{
"/film/performance/actor": {
"name": null
}
}]
}]
TODO: fix up naming for quads and make strict parsing an option.
104 lines
2.1 KiB
Go
104 lines
2.1 KiB
Go
// Copyright 2014 The Cayley Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package db
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import (
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"bytes"
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"compress/bzip2"
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"compress/gzip"
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"fmt"
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"io"
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"os"
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"github.com/barakmich/glog"
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"github.com/google/cayley/config"
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"github.com/google/cayley/graph"
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"github.com/google/cayley/quad"
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"github.com/google/cayley/quad/cquads"
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)
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func Load(ts graph.TripleStore, cfg *config.Config, path string) error {
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f, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("could not open file %q: %v", path, err)
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}
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defer f.Close()
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r, err := decompressor(f)
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if err != nil {
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glog.Fatalln(err)
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}
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dec := cquads.NewDecoder(r)
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bulker, canBulk := ts.(graph.BulkLoader)
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if canBulk {
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err = bulker.BulkLoad(dec)
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if err == nil {
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return nil
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}
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if err == graph.ErrCannotBulkLoad {
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err = nil
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}
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}
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if err != nil {
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return err
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}
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block := make([]*quad.Quad, 0, cfg.LoadSize)
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for {
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t, err := dec.Unmarshal()
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if err != nil {
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if err == io.EOF {
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break
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}
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return err
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}
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block = append(block, t)
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if len(block) == cap(block) {
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ts.AddTripleSet(block)
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block = block[:0]
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}
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}
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ts.AddTripleSet(block)
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return nil
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}
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const (
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gzipMagic = "\x1f\x8b"
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b2zipMagic = "BZh"
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)
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type readAtReader interface {
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io.Reader
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io.ReaderAt
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}
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func decompressor(r readAtReader) (io.Reader, error) {
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var buf [3]byte
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_, err := r.ReadAt(buf[:], 0)
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if err != nil {
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return nil, err
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}
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switch {
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case bytes.Compare(buf[:2], []byte(gzipMagic)) == 0:
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return gzip.NewReader(r)
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case bytes.Compare(buf[:3], []byte(b2zipMagic)) == 0:
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return bzip2.NewReader(r), nil
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default:
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return r, nil
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}
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}
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