mirror of
https://codeberg.org/forgejo/forgejo.git
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312 lines
8.6 KiB
Go
Vendored
312 lines
8.6 KiB
Go
Vendored
// Copyright (c) 2017 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 zap
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"math"
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"reflect"
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"sort"
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index "github.com/blevesearch/bleve_index_api"
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segment "github.com/blevesearch/scorch_segment_api"
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"github.com/golang/snappy"
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)
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var reflectStaticSizedocValueReader int
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func init() {
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var dvi docValueReader
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reflectStaticSizedocValueReader = int(reflect.TypeOf(dvi).Size())
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}
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type docNumTermsVisitor func(docNum uint64, terms []byte) error
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type docVisitState struct {
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dvrs map[uint16]*docValueReader
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segment *SegmentBase
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}
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type docValueReader struct {
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field string
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curChunkNum uint64
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chunkOffsets []uint64
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dvDataLoc uint64
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curChunkHeader []MetaData
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curChunkData []byte // compressed data cache
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uncompressed []byte // temp buf for snappy decompression
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}
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func (di *docValueReader) size() int {
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return reflectStaticSizedocValueReader + SizeOfPtr +
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len(di.field) +
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len(di.chunkOffsets)*SizeOfUint64 +
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len(di.curChunkHeader)*reflectStaticSizeMetaData +
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len(di.curChunkData)
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}
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func (di *docValueReader) cloneInto(rv *docValueReader) *docValueReader {
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if rv == nil {
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rv = &docValueReader{}
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}
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rv.field = di.field
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rv.curChunkNum = math.MaxUint64
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rv.chunkOffsets = di.chunkOffsets // immutable, so it's sharable
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rv.dvDataLoc = di.dvDataLoc
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rv.curChunkHeader = rv.curChunkHeader[:0]
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rv.curChunkData = nil
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rv.uncompressed = rv.uncompressed[:0]
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return rv
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}
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func (di *docValueReader) curChunkNumber() uint64 {
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return di.curChunkNum
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}
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func (s *SegmentBase) loadFieldDocValueReader(field string,
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fieldDvLocStart, fieldDvLocEnd uint64) (*docValueReader, error) {
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// get the docValue offset for the given fields
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if fieldDvLocStart == fieldNotUninverted {
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// no docValues found, nothing to do
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return nil, nil
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}
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// read the number of chunks, and chunk offsets position
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var numChunks, chunkOffsetsPosition uint64
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if fieldDvLocEnd-fieldDvLocStart > 16 {
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numChunks = binary.BigEndian.Uint64(s.mem[fieldDvLocEnd-8 : fieldDvLocEnd])
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// read the length of chunk offsets
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chunkOffsetsLen := binary.BigEndian.Uint64(s.mem[fieldDvLocEnd-16 : fieldDvLocEnd-8])
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// acquire position of chunk offsets
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chunkOffsetsPosition = (fieldDvLocEnd - 16) - chunkOffsetsLen
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} else {
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return nil, fmt.Errorf("loadFieldDocValueReader: fieldDvLoc too small: %d-%d", fieldDvLocEnd, fieldDvLocStart)
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}
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fdvIter := &docValueReader{
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curChunkNum: math.MaxUint64,
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field: field,
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chunkOffsets: make([]uint64, int(numChunks)),
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}
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// read the chunk offsets
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var offset uint64
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for i := 0; i < int(numChunks); i++ {
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loc, read := binary.Uvarint(s.mem[chunkOffsetsPosition+offset : chunkOffsetsPosition+offset+binary.MaxVarintLen64])
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if read <= 0 {
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return nil, fmt.Errorf("corrupted chunk offset during segment load")
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}
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fdvIter.chunkOffsets[i] = loc
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offset += uint64(read)
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}
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// set the data offset
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fdvIter.dvDataLoc = fieldDvLocStart
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return fdvIter, nil
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}
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func (di *docValueReader) loadDvChunk(chunkNumber uint64, s *SegmentBase) error {
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// advance to the chunk where the docValues
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// reside for the given docNum
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destChunkDataLoc, curChunkEnd := di.dvDataLoc, di.dvDataLoc
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start, end := readChunkBoundary(int(chunkNumber), di.chunkOffsets)
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if start >= end {
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di.curChunkHeader = di.curChunkHeader[:0]
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di.curChunkData = nil
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di.curChunkNum = chunkNumber
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di.uncompressed = di.uncompressed[:0]
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return nil
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}
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destChunkDataLoc += start
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curChunkEnd += end
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// read the number of docs reside in the chunk
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numDocs, read := binary.Uvarint(s.mem[destChunkDataLoc : destChunkDataLoc+binary.MaxVarintLen64])
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if read <= 0 {
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return fmt.Errorf("failed to read the chunk")
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}
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chunkMetaLoc := destChunkDataLoc + uint64(read)
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offset := uint64(0)
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if cap(di.curChunkHeader) < int(numDocs) {
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di.curChunkHeader = make([]MetaData, int(numDocs))
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} else {
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di.curChunkHeader = di.curChunkHeader[:int(numDocs)]
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}
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for i := 0; i < int(numDocs); i++ {
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di.curChunkHeader[i].DocNum, read = binary.Uvarint(s.mem[chunkMetaLoc+offset : chunkMetaLoc+offset+binary.MaxVarintLen64])
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offset += uint64(read)
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di.curChunkHeader[i].DocDvOffset, read = binary.Uvarint(s.mem[chunkMetaLoc+offset : chunkMetaLoc+offset+binary.MaxVarintLen64])
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offset += uint64(read)
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}
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compressedDataLoc := chunkMetaLoc + offset
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dataLength := curChunkEnd - compressedDataLoc
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di.curChunkData = s.mem[compressedDataLoc : compressedDataLoc+dataLength]
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di.curChunkNum = chunkNumber
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di.uncompressed = di.uncompressed[:0]
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return nil
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}
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func (di *docValueReader) iterateAllDocValues(s *SegmentBase, visitor docNumTermsVisitor) error {
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for i := 0; i < len(di.chunkOffsets); i++ {
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err := di.loadDvChunk(uint64(i), s)
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if err != nil {
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return err
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}
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if di.curChunkData == nil || len(di.curChunkHeader) == 0 {
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continue
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}
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// uncompress the already loaded data
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uncompressed, err := snappy.Decode(di.uncompressed[:cap(di.uncompressed)], di.curChunkData)
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if err != nil {
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return err
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}
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di.uncompressed = uncompressed
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start := uint64(0)
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for _, entry := range di.curChunkHeader {
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err = visitor(entry.DocNum, uncompressed[start:entry.DocDvOffset])
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if err != nil {
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return err
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}
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start = entry.DocDvOffset
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}
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}
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return nil
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}
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func (di *docValueReader) visitDocValues(docNum uint64,
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visitor index.DocValueVisitor) error {
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// binary search the term locations for the docNum
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start, end := di.getDocValueLocs(docNum)
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if start == math.MaxUint64 || end == math.MaxUint64 || start == end {
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return nil
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}
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var uncompressed []byte
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var err error
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// use the uncompressed copy if available
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if len(di.uncompressed) > 0 {
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uncompressed = di.uncompressed
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} else {
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// uncompress the already loaded data
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uncompressed, err = snappy.Decode(di.uncompressed[:cap(di.uncompressed)], di.curChunkData)
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if err != nil {
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return err
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}
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di.uncompressed = uncompressed
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}
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// pick the terms for the given docNum
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uncompressed = uncompressed[start:end]
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for {
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i := bytes.Index(uncompressed, termSeparatorSplitSlice)
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if i < 0 {
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break
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}
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visitor(di.field, uncompressed[0:i])
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uncompressed = uncompressed[i+1:]
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}
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return nil
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}
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func (di *docValueReader) getDocValueLocs(docNum uint64) (uint64, uint64) {
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i := sort.Search(len(di.curChunkHeader), func(i int) bool {
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return di.curChunkHeader[i].DocNum >= docNum
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})
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if i < len(di.curChunkHeader) && di.curChunkHeader[i].DocNum == docNum {
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return ReadDocValueBoundary(i, di.curChunkHeader)
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}
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return math.MaxUint64, math.MaxUint64
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}
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// VisitDocValues is an implementation of the
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// DocValueVisitable interface
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func (s *SegmentBase) VisitDocValues(localDocNum uint64, fields []string,
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visitor index.DocValueVisitor, dvsIn segment.DocVisitState) (
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segment.DocVisitState, error) {
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dvs, ok := dvsIn.(*docVisitState)
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if !ok || dvs == nil {
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dvs = &docVisitState{}
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} else {
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if dvs.segment != s {
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dvs.segment = s
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dvs.dvrs = nil
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}
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}
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var fieldIDPlus1 uint16
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if dvs.dvrs == nil {
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dvs.dvrs = make(map[uint16]*docValueReader, len(fields))
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for _, field := range fields {
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if fieldIDPlus1, ok = s.fieldsMap[field]; !ok {
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continue
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}
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fieldID := fieldIDPlus1 - 1
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if dvIter, exists := s.fieldDvReaders[fieldID]; exists &&
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dvIter != nil {
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dvs.dvrs[fieldID] = dvIter.cloneInto(dvs.dvrs[fieldID])
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}
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}
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}
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// find the chunkNumber where the docValues are stored
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// NOTE: doc values continue to use legacy chunk mode
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chunkFactor, err := getChunkSize(LegacyChunkMode, 0, 0)
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if err != nil {
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return nil, err
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}
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docInChunk := localDocNum / chunkFactor
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var dvr *docValueReader
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for _, field := range fields {
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if fieldIDPlus1, ok = s.fieldsMap[field]; !ok {
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continue
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}
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fieldID := fieldIDPlus1 - 1
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if dvr, ok = dvs.dvrs[fieldID]; ok && dvr != nil {
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// check if the chunk is already loaded
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if docInChunk != dvr.curChunkNumber() {
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err := dvr.loadDvChunk(docInChunk, s)
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if err != nil {
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return dvs, err
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}
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}
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_ = dvr.visitDocValues(localDocNum, visitor)
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}
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}
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return dvs, nil
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}
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// VisitableDocValueFields returns the list of fields with
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// persisted doc value terms ready to be visitable using the
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// VisitDocumentFieldTerms method.
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func (s *SegmentBase) VisitableDocValueFields() ([]string, error) {
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return s.fieldDvNames, nil
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}
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