9bf09a5db5
This supports gzip and bzip2 by magic number determination. Trailing whitespace differences in documentation due to opinionated editor.
107 lines
2.3 KiB
Go
107 lines
2.3 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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"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/nquads"
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)
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func Load(ts graph.TripleStore, cfg *config.Config, triplePath string) {
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tChan := make(chan *graph.Triple)
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go ReadTriplesFromFile(tChan, triplePath)
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bulker, canBulk := ts.(graph.BulkLoader)
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if canBulk {
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err := bulker.BulkLoad(tChan)
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if err == nil {
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return
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}
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if err != graph.ErrCannotBulkLoad {
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glog.Errorln("Error attempting to bulk load: ", err)
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}
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}
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LoadTriplesInto(tChan, ts, cfg.LoadSize)
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}
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func ReadTriplesFromFile(c chan *graph.Triple, tripleFile string) {
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f, err := os.Open(tripleFile)
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if err != nil {
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glog.Fatalln("Couldn't open file", tripleFile)
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}
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defer func() {
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if err := f.Close(); err != nil {
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glog.Fatalln(err)
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}
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}()
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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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nquads.ReadNQuadsFromReader(c, r)
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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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func LoadTriplesInto(tChan chan *graph.Triple, ts graph.TripleStore, loadSize int) {
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tripleblock := make([]*graph.Triple, loadSize)
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i := 0
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for t := range tChan {
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tripleblock[i] = t
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i++
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if i == loadSize {
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ts.AddTripleSet(tripleblock)
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i = 0
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}
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}
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ts.AddTripleSet(tripleblock[0:i])
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}
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