337 lines
8.9 KiB
Go
337 lines
8.9 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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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 upsidedown
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import (
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"bytes"
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"sort"
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"sync/atomic"
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"github.com/blevesearch/bleve/index"
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"github.com/blevesearch/bleve/index/store"
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)
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type UpsideDownCouchTermFieldReader struct {
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count uint64
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indexReader *IndexReader
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iterator store.KVIterator
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term []byte
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tfrNext *TermFrequencyRow
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tfrPrealloc TermFrequencyRow
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keyBuf []byte
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field uint16
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includeTermVectors bool
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}
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func newUpsideDownCouchTermFieldReader(indexReader *IndexReader, term []byte, field uint16, includeFreq, includeNorm, includeTermVectors bool) (*UpsideDownCouchTermFieldReader, error) {
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bufNeeded := termFrequencyRowKeySize(term, nil)
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if bufNeeded < dictionaryRowKeySize(term) {
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bufNeeded = dictionaryRowKeySize(term)
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}
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buf := make([]byte, bufNeeded)
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bufUsed := dictionaryRowKeyTo(buf, field, term)
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val, err := indexReader.kvreader.Get(buf[:bufUsed])
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if err != nil {
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return nil, err
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}
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if val == nil {
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atomic.AddUint64(&indexReader.index.stats.termSearchersStarted, uint64(1))
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rv := &UpsideDownCouchTermFieldReader{
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count: 0,
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term: term,
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field: field,
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includeTermVectors: includeTermVectors,
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}
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rv.tfrNext = &rv.tfrPrealloc
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return rv, nil
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}
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count, err := dictionaryRowParseV(val)
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if err != nil {
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return nil, err
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}
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bufUsed = termFrequencyRowKeyTo(buf, field, term, nil)
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it := indexReader.kvreader.PrefixIterator(buf[:bufUsed])
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atomic.AddUint64(&indexReader.index.stats.termSearchersStarted, uint64(1))
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return &UpsideDownCouchTermFieldReader{
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indexReader: indexReader,
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iterator: it,
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count: count,
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term: term,
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field: field,
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includeTermVectors: includeTermVectors,
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}, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Count() uint64 {
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return r.count
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}
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func (r *UpsideDownCouchTermFieldReader) Next(preAlloced *index.TermFieldDoc) (*index.TermFieldDoc, error) {
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if r.iterator != nil {
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// We treat tfrNext also like an initialization flag, which
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// tells us whether we need to invoke the underlying
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// iterator.Next(). The first time, don't call iterator.Next().
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if r.tfrNext != nil {
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r.iterator.Next()
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} else {
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r.tfrNext = &r.tfrPrealloc
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}
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key, val, valid := r.iterator.Current()
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if valid {
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tfr := r.tfrNext
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err := tfr.parseKDoc(key, r.term)
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if err != nil {
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return nil, err
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}
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err = tfr.parseV(val, r.includeTermVectors)
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if err != nil {
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return nil, err
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}
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rv := preAlloced
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if rv == nil {
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rv = &index.TermFieldDoc{}
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}
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rv.ID = append(rv.ID, tfr.doc...)
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rv.Freq = tfr.freq
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rv.Norm = float64(tfr.norm)
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if tfr.vectors != nil {
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rv.Vectors = r.indexReader.index.termFieldVectorsFromTermVectors(tfr.vectors)
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}
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return rv, nil
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}
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}
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return nil, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Advance(docID index.IndexInternalID, preAlloced *index.TermFieldDoc) (rv *index.TermFieldDoc, err error) {
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if r.iterator != nil {
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if r.tfrNext == nil {
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r.tfrNext = &TermFrequencyRow{}
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}
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tfr := InitTermFrequencyRow(r.tfrNext, r.term, r.field, docID, 0, 0)
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r.keyBuf, err = tfr.KeyAppendTo(r.keyBuf[:0])
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if err != nil {
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return nil, err
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}
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r.iterator.Seek(r.keyBuf)
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key, val, valid := r.iterator.Current()
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if valid {
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err := tfr.parseKDoc(key, r.term)
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if err != nil {
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return nil, err
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}
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err = tfr.parseV(val, r.includeTermVectors)
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if err != nil {
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return nil, err
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}
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rv = preAlloced
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if rv == nil {
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rv = &index.TermFieldDoc{}
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}
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rv.ID = append(rv.ID, tfr.doc...)
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rv.Freq = tfr.freq
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rv.Norm = float64(tfr.norm)
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if tfr.vectors != nil {
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rv.Vectors = r.indexReader.index.termFieldVectorsFromTermVectors(tfr.vectors)
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}
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return rv, nil
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}
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}
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return nil, nil
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}
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func (r *UpsideDownCouchTermFieldReader) Close() error {
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if r.indexReader != nil {
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atomic.AddUint64(&r.indexReader.index.stats.termSearchersFinished, uint64(1))
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}
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if r.iterator != nil {
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return r.iterator.Close()
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}
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return nil
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}
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type UpsideDownCouchDocIDReader struct {
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indexReader *IndexReader
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iterator store.KVIterator
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only []string
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onlyPos int
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onlyMode bool
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}
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func newUpsideDownCouchDocIDReader(indexReader *IndexReader) (*UpsideDownCouchDocIDReader, error) {
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startBytes := []byte{0x0}
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endBytes := []byte{0xff}
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bisr := NewBackIndexRow(startBytes, nil, nil)
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bier := NewBackIndexRow(endBytes, nil, nil)
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it := indexReader.kvreader.RangeIterator(bisr.Key(), bier.Key())
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return &UpsideDownCouchDocIDReader{
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indexReader: indexReader,
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iterator: it,
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}, nil
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}
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func newUpsideDownCouchDocIDReaderOnly(indexReader *IndexReader, ids []string) (*UpsideDownCouchDocIDReader, error) {
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// ensure ids are sorted
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sort.Strings(ids)
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startBytes := []byte{0x0}
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if len(ids) > 0 {
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startBytes = []byte(ids[0])
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}
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endBytes := []byte{0xff}
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if len(ids) > 0 {
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endBytes = incrementBytes([]byte(ids[len(ids)-1]))
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}
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bisr := NewBackIndexRow(startBytes, nil, nil)
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bier := NewBackIndexRow(endBytes, nil, nil)
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it := indexReader.kvreader.RangeIterator(bisr.Key(), bier.Key())
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return &UpsideDownCouchDocIDReader{
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indexReader: indexReader,
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iterator: it,
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only: ids,
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onlyMode: true,
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}, nil
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}
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func (r *UpsideDownCouchDocIDReader) Next() (index.IndexInternalID, error) {
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key, val, valid := r.iterator.Current()
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if r.onlyMode {
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var rv index.IndexInternalID
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for valid && r.onlyPos < len(r.only) {
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return nil, err
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}
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if !bytes.Equal(br.doc, []byte(r.only[r.onlyPos])) {
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ok := r.nextOnly()
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if !ok {
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return nil, nil
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}
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r.iterator.Seek(NewBackIndexRow([]byte(r.only[r.onlyPos]), nil, nil).Key())
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key, val, valid = r.iterator.Current()
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continue
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} else {
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rv = append([]byte(nil), br.doc...)
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break
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}
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}
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if valid && r.onlyPos < len(r.only) {
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ok := r.nextOnly()
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if ok {
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r.iterator.Seek(NewBackIndexRow([]byte(r.only[r.onlyPos]), nil, nil).Key())
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}
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return rv, nil
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}
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} else {
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if valid {
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return nil, err
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}
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rv := append([]byte(nil), br.doc...)
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r.iterator.Next()
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return rv, nil
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}
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}
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return nil, nil
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}
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func (r *UpsideDownCouchDocIDReader) Advance(docID index.IndexInternalID) (index.IndexInternalID, error) {
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if r.onlyMode {
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r.onlyPos = sort.SearchStrings(r.only, string(docID))
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if r.onlyPos >= len(r.only) {
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// advanced to key after our last only key
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return nil, nil
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}
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r.iterator.Seek(NewBackIndexRow([]byte(r.only[r.onlyPos]), nil, nil).Key())
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key, val, valid := r.iterator.Current()
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var rv index.IndexInternalID
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for valid && r.onlyPos < len(r.only) {
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return nil, err
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}
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if !bytes.Equal(br.doc, []byte(r.only[r.onlyPos])) {
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// the only key we seek'd to didn't exist
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// now look for the closest key that did exist in only
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r.onlyPos = sort.SearchStrings(r.only, string(br.doc))
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if r.onlyPos >= len(r.only) {
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// advanced to key after our last only key
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return nil, nil
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}
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// now seek to this new only key
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r.iterator.Seek(NewBackIndexRow([]byte(r.only[r.onlyPos]), nil, nil).Key())
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key, val, valid = r.iterator.Current()
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continue
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} else {
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rv = append([]byte(nil), br.doc...)
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break
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}
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}
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if valid && r.onlyPos < len(r.only) {
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ok := r.nextOnly()
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if ok {
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r.iterator.Seek(NewBackIndexRow([]byte(r.only[r.onlyPos]), nil, nil).Key())
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}
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return rv, nil
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}
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} else {
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bir := NewBackIndexRow(docID, nil, nil)
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r.iterator.Seek(bir.Key())
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key, val, valid := r.iterator.Current()
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if valid {
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br, err := NewBackIndexRowKV(key, val)
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if err != nil {
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return nil, err
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}
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rv := append([]byte(nil), br.doc...)
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r.iterator.Next()
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return rv, nil
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}
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}
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return nil, nil
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}
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func (r *UpsideDownCouchDocIDReader) Close() error {
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return r.iterator.Close()
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}
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// move the r.only pos forward one, skipping duplicates
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// return true if there is more data, or false if we got to the end of the list
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func (r *UpsideDownCouchDocIDReader) nextOnly() bool {
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// advance 1 position, until we see a different key
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// it's already sorted, so this skips duplicates
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start := r.onlyPos
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r.onlyPos++
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for r.onlyPos < len(r.only) && r.only[r.onlyPos] == r.only[start] {
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start = r.onlyPos
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r.onlyPos++
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}
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// inidicate if we got to the end of the list
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return r.onlyPos < len(r.only)
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}
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