mirror of
https://github.com/go-gitea/gitea.git
synced 2024-11-27 19:13:48 +08:00
312 lines
8.6 KiB
Go
Vendored
312 lines
8.6 KiB
Go
Vendored
// Copyright (c) 2017 Couchbase, Inc.
|
|
//
|
|
// 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 zap
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"math"
|
|
"reflect"
|
|
"sort"
|
|
|
|
index "github.com/blevesearch/bleve_index_api"
|
|
segment "github.com/blevesearch/scorch_segment_api/v2"
|
|
"github.com/golang/snappy"
|
|
)
|
|
|
|
var reflectStaticSizedocValueReader int
|
|
|
|
func init() {
|
|
var dvi docValueReader
|
|
reflectStaticSizedocValueReader = int(reflect.TypeOf(dvi).Size())
|
|
}
|
|
|
|
type docNumTermsVisitor func(docNum uint64, terms []byte) error
|
|
|
|
type docVisitState struct {
|
|
dvrs map[uint16]*docValueReader
|
|
segment *SegmentBase
|
|
}
|
|
|
|
type docValueReader struct {
|
|
field string
|
|
curChunkNum uint64
|
|
chunkOffsets []uint64
|
|
dvDataLoc uint64
|
|
curChunkHeader []MetaData
|
|
curChunkData []byte // compressed data cache
|
|
uncompressed []byte // temp buf for snappy decompression
|
|
}
|
|
|
|
func (di *docValueReader) size() int {
|
|
return reflectStaticSizedocValueReader + SizeOfPtr +
|
|
len(di.field) +
|
|
len(di.chunkOffsets)*SizeOfUint64 +
|
|
len(di.curChunkHeader)*reflectStaticSizeMetaData +
|
|
len(di.curChunkData)
|
|
}
|
|
|
|
func (di *docValueReader) cloneInto(rv *docValueReader) *docValueReader {
|
|
if rv == nil {
|
|
rv = &docValueReader{}
|
|
}
|
|
|
|
rv.field = di.field
|
|
rv.curChunkNum = math.MaxUint64
|
|
rv.chunkOffsets = di.chunkOffsets // immutable, so it's sharable
|
|
rv.dvDataLoc = di.dvDataLoc
|
|
rv.curChunkHeader = rv.curChunkHeader[:0]
|
|
rv.curChunkData = nil
|
|
rv.uncompressed = rv.uncompressed[:0]
|
|
|
|
return rv
|
|
}
|
|
|
|
func (di *docValueReader) curChunkNumber() uint64 {
|
|
return di.curChunkNum
|
|
}
|
|
|
|
func (s *SegmentBase) loadFieldDocValueReader(field string,
|
|
fieldDvLocStart, fieldDvLocEnd uint64) (*docValueReader, error) {
|
|
// get the docValue offset for the given fields
|
|
if fieldDvLocStart == fieldNotUninverted {
|
|
// no docValues found, nothing to do
|
|
return nil, nil
|
|
}
|
|
|
|
// read the number of chunks, and chunk offsets position
|
|
var numChunks, chunkOffsetsPosition uint64
|
|
|
|
if fieldDvLocEnd-fieldDvLocStart > 16 {
|
|
numChunks = binary.BigEndian.Uint64(s.mem[fieldDvLocEnd-8 : fieldDvLocEnd])
|
|
// read the length of chunk offsets
|
|
chunkOffsetsLen := binary.BigEndian.Uint64(s.mem[fieldDvLocEnd-16 : fieldDvLocEnd-8])
|
|
// acquire position of chunk offsets
|
|
chunkOffsetsPosition = (fieldDvLocEnd - 16) - chunkOffsetsLen
|
|
} else {
|
|
return nil, fmt.Errorf("loadFieldDocValueReader: fieldDvLoc too small: %d-%d", fieldDvLocEnd, fieldDvLocStart)
|
|
}
|
|
|
|
fdvIter := &docValueReader{
|
|
curChunkNum: math.MaxUint64,
|
|
field: field,
|
|
chunkOffsets: make([]uint64, int(numChunks)),
|
|
}
|
|
|
|
// read the chunk offsets
|
|
var offset uint64
|
|
for i := 0; i < int(numChunks); i++ {
|
|
loc, read := binary.Uvarint(s.mem[chunkOffsetsPosition+offset : chunkOffsetsPosition+offset+binary.MaxVarintLen64])
|
|
if read <= 0 {
|
|
return nil, fmt.Errorf("corrupted chunk offset during segment load")
|
|
}
|
|
fdvIter.chunkOffsets[i] = loc
|
|
offset += uint64(read)
|
|
}
|
|
|
|
// set the data offset
|
|
fdvIter.dvDataLoc = fieldDvLocStart
|
|
|
|
return fdvIter, nil
|
|
}
|
|
|
|
func (di *docValueReader) loadDvChunk(chunkNumber uint64, s *SegmentBase) error {
|
|
// advance to the chunk where the docValues
|
|
// reside for the given docNum
|
|
destChunkDataLoc, curChunkEnd := di.dvDataLoc, di.dvDataLoc
|
|
start, end := readChunkBoundary(int(chunkNumber), di.chunkOffsets)
|
|
if start >= end {
|
|
di.curChunkHeader = di.curChunkHeader[:0]
|
|
di.curChunkData = nil
|
|
di.curChunkNum = chunkNumber
|
|
di.uncompressed = di.uncompressed[:0]
|
|
return nil
|
|
}
|
|
|
|
destChunkDataLoc += start
|
|
curChunkEnd += end
|
|
|
|
// read the number of docs reside in the chunk
|
|
numDocs, read := binary.Uvarint(s.mem[destChunkDataLoc : destChunkDataLoc+binary.MaxVarintLen64])
|
|
if read <= 0 {
|
|
return fmt.Errorf("failed to read the chunk")
|
|
}
|
|
chunkMetaLoc := destChunkDataLoc + uint64(read)
|
|
|
|
offset := uint64(0)
|
|
if cap(di.curChunkHeader) < int(numDocs) {
|
|
di.curChunkHeader = make([]MetaData, int(numDocs))
|
|
} else {
|
|
di.curChunkHeader = di.curChunkHeader[:int(numDocs)]
|
|
}
|
|
for i := 0; i < int(numDocs); i++ {
|
|
di.curChunkHeader[i].DocNum, read = binary.Uvarint(s.mem[chunkMetaLoc+offset : chunkMetaLoc+offset+binary.MaxVarintLen64])
|
|
offset += uint64(read)
|
|
di.curChunkHeader[i].DocDvOffset, read = binary.Uvarint(s.mem[chunkMetaLoc+offset : chunkMetaLoc+offset+binary.MaxVarintLen64])
|
|
offset += uint64(read)
|
|
}
|
|
|
|
compressedDataLoc := chunkMetaLoc + offset
|
|
dataLength := curChunkEnd - compressedDataLoc
|
|
di.curChunkData = s.mem[compressedDataLoc : compressedDataLoc+dataLength]
|
|
di.curChunkNum = chunkNumber
|
|
di.uncompressed = di.uncompressed[:0]
|
|
return nil
|
|
}
|
|
|
|
func (di *docValueReader) iterateAllDocValues(s *SegmentBase, visitor docNumTermsVisitor) error {
|
|
for i := 0; i < len(di.chunkOffsets); i++ {
|
|
err := di.loadDvChunk(uint64(i), s)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if di.curChunkData == nil || len(di.curChunkHeader) == 0 {
|
|
continue
|
|
}
|
|
|
|
// uncompress the already loaded data
|
|
uncompressed, err := snappy.Decode(di.uncompressed[:cap(di.uncompressed)], di.curChunkData)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
di.uncompressed = uncompressed
|
|
|
|
start := uint64(0)
|
|
for _, entry := range di.curChunkHeader {
|
|
err = visitor(entry.DocNum, uncompressed[start:entry.DocDvOffset])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
start = entry.DocDvOffset
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (di *docValueReader) visitDocValues(docNum uint64,
|
|
visitor index.DocValueVisitor) error {
|
|
// binary search the term locations for the docNum
|
|
start, end := di.getDocValueLocs(docNum)
|
|
if start == math.MaxUint64 || end == math.MaxUint64 || start == end {
|
|
return nil
|
|
}
|
|
|
|
var uncompressed []byte
|
|
var err error
|
|
// use the uncompressed copy if available
|
|
if len(di.uncompressed) > 0 {
|
|
uncompressed = di.uncompressed
|
|
} else {
|
|
// uncompress the already loaded data
|
|
uncompressed, err = snappy.Decode(di.uncompressed[:cap(di.uncompressed)], di.curChunkData)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
di.uncompressed = uncompressed
|
|
}
|
|
|
|
// pick the terms for the given docNum
|
|
uncompressed = uncompressed[start:end]
|
|
for {
|
|
i := bytes.Index(uncompressed, termSeparatorSplitSlice)
|
|
if i < 0 {
|
|
break
|
|
}
|
|
|
|
visitor(di.field, uncompressed[0:i])
|
|
uncompressed = uncompressed[i+1:]
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (di *docValueReader) getDocValueLocs(docNum uint64) (uint64, uint64) {
|
|
i := sort.Search(len(di.curChunkHeader), func(i int) bool {
|
|
return di.curChunkHeader[i].DocNum >= docNum
|
|
})
|
|
if i < len(di.curChunkHeader) && di.curChunkHeader[i].DocNum == docNum {
|
|
return ReadDocValueBoundary(i, di.curChunkHeader)
|
|
}
|
|
return math.MaxUint64, math.MaxUint64
|
|
}
|
|
|
|
// VisitDocValues is an implementation of the
|
|
// DocValueVisitable interface
|
|
func (s *SegmentBase) VisitDocValues(localDocNum uint64, fields []string,
|
|
visitor index.DocValueVisitor, dvsIn segment.DocVisitState) (
|
|
segment.DocVisitState, error) {
|
|
dvs, ok := dvsIn.(*docVisitState)
|
|
if !ok || dvs == nil {
|
|
dvs = &docVisitState{}
|
|
} else {
|
|
if dvs.segment != s {
|
|
dvs.segment = s
|
|
dvs.dvrs = nil
|
|
}
|
|
}
|
|
|
|
var fieldIDPlus1 uint16
|
|
if dvs.dvrs == nil {
|
|
dvs.dvrs = make(map[uint16]*docValueReader, len(fields))
|
|
for _, field := range fields {
|
|
if fieldIDPlus1, ok = s.fieldsMap[field]; !ok {
|
|
continue
|
|
}
|
|
fieldID := fieldIDPlus1 - 1
|
|
if dvIter, exists := s.fieldDvReaders[fieldID]; exists &&
|
|
dvIter != nil {
|
|
dvs.dvrs[fieldID] = dvIter.cloneInto(dvs.dvrs[fieldID])
|
|
}
|
|
}
|
|
}
|
|
|
|
// find the chunkNumber where the docValues are stored
|
|
// NOTE: doc values continue to use legacy chunk mode
|
|
chunkFactor, err := getChunkSize(LegacyChunkMode, 0, 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
docInChunk := localDocNum / chunkFactor
|
|
var dvr *docValueReader
|
|
for _, field := range fields {
|
|
if fieldIDPlus1, ok = s.fieldsMap[field]; !ok {
|
|
continue
|
|
}
|
|
fieldID := fieldIDPlus1 - 1
|
|
if dvr, ok = dvs.dvrs[fieldID]; ok && dvr != nil {
|
|
// check if the chunk is already loaded
|
|
if docInChunk != dvr.curChunkNumber() {
|
|
err := dvr.loadDvChunk(docInChunk, s)
|
|
if err != nil {
|
|
return dvs, err
|
|
}
|
|
}
|
|
|
|
_ = dvr.visitDocValues(localDocNum, visitor)
|
|
}
|
|
}
|
|
return dvs, nil
|
|
}
|
|
|
|
// VisitableDocValueFields returns the list of fields with
|
|
// persisted doc value terms ready to be visitable using the
|
|
// VisitDocumentFieldTerms method.
|
|
func (s *SegmentBase) VisitableDocValueFields() ([]string, error) {
|
|
return s.fieldDvNames, nil
|
|
}
|