da794d3762
in a recent commit, we changed the code to reuse TermFrequencyRow objects intsead of constantly allocating new ones. unfortunately, one of the original methods was not coded with this reuse in mind, and a lazy initialization cause us to leak data from previous uses of the same object. in particular this caused term vector information from previous hits to still be applied to subsequent hits. eventually this causes the highlighter to try and highlight invalid regions of a slice. fixes #404
843 lines
20 KiB
Go
843 lines
20 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
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// except in compliance with the License. You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed under the
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// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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package upside_down
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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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"io"
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"math"
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"github.com/golang/protobuf/proto"
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)
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const ByteSeparator byte = 0xff
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type UpsideDownCouchRowStream chan UpsideDownCouchRow
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type UpsideDownCouchRow interface {
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KeySize() int
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KeyTo([]byte) (int, error)
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Key() []byte
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Value() []byte
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ValueSize() int
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ValueTo([]byte) (int, error)
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}
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func ParseFromKeyValue(key, value []byte) (UpsideDownCouchRow, error) {
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if len(key) > 0 {
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switch key[0] {
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case 'v':
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return NewVersionRowKV(key, value)
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case 'f':
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return NewFieldRowKV(key, value)
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case 'd':
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return NewDictionaryRowKV(key, value)
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case 't':
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return NewTermFrequencyRowKV(key, value)
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case 'b':
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return NewBackIndexRowKV(key, value)
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case 's':
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return NewStoredRowKV(key, value)
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case 'i':
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return NewInternalRowKV(key, value)
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}
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return nil, fmt.Errorf("Unknown field type '%s'", string(key[0]))
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}
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return nil, fmt.Errorf("Invalid empty key")
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}
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// VERSION
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type VersionRow struct {
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version uint8
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}
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func (v *VersionRow) Key() []byte {
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return []byte{'v'}
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}
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func (v *VersionRow) KeySize() int {
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return 1
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}
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func (v *VersionRow) KeyTo(buf []byte) (int, error) {
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buf[0] = 'v'
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return 1, nil
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}
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func (v *VersionRow) Value() []byte {
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return []byte{byte(v.version)}
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}
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func (v *VersionRow) ValueSize() int {
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return 1
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}
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func (v *VersionRow) ValueTo(buf []byte) (int, error) {
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buf[0] = v.version
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return 1, nil
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}
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func (v *VersionRow) String() string {
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return fmt.Sprintf("Version: %d", v.version)
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}
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func NewVersionRow(version uint8) *VersionRow {
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return &VersionRow{
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version: version,
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}
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}
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func NewVersionRowKV(key, value []byte) (*VersionRow, error) {
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rv := VersionRow{}
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buf := bytes.NewBuffer(value)
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err := binary.Read(buf, binary.LittleEndian, &rv.version)
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if err != nil {
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return nil, err
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}
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return &rv, nil
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}
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// INTERNAL STORAGE
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type InternalRow struct {
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key []byte
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val []byte
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}
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func (i *InternalRow) Key() []byte {
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buf := make([]byte, i.KeySize())
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size, _ := i.KeyTo(buf)
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return buf[:size]
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}
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func (i *InternalRow) KeySize() int {
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return len(i.key) + 1
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}
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func (i *InternalRow) KeyTo(buf []byte) (int, error) {
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buf[0] = 'i'
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actual := copy(buf[1:], i.key)
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return 1 + actual, nil
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}
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func (i *InternalRow) Value() []byte {
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return i.val
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}
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func (i *InternalRow) ValueSize() int {
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return len(i.val)
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}
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func (i *InternalRow) ValueTo(buf []byte) (int, error) {
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actual := copy(buf, i.val)
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return actual, nil
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}
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func (i *InternalRow) String() string {
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return fmt.Sprintf("InternalStore - Key: %s (% x) Val: %s (% x)", i.key, i.key, i.val, i.val)
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}
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func NewInternalRow(key, val []byte) *InternalRow {
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return &InternalRow{
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key: key,
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val: val,
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}
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}
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func NewInternalRowKV(key, value []byte) (*InternalRow, error) {
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rv := InternalRow{}
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rv.key = key[1:]
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rv.val = value
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return &rv, nil
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}
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// FIELD definition
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type FieldRow struct {
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index uint16
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name string
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}
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func (f *FieldRow) Key() []byte {
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buf := make([]byte, f.KeySize())
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size, _ := f.KeyTo(buf)
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return buf[:size]
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}
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func (f *FieldRow) KeySize() int {
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return 3
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}
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func (f *FieldRow) KeyTo(buf []byte) (int, error) {
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buf[0] = 'f'
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binary.LittleEndian.PutUint16(buf[1:3], f.index)
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return 3, nil
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}
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func (f *FieldRow) Value() []byte {
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return append([]byte(f.name), ByteSeparator)
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}
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func (f *FieldRow) ValueSize() int {
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return len(f.name) + 1
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}
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func (f *FieldRow) ValueTo(buf []byte) (int, error) {
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size := copy(buf, f.name)
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buf[size] = ByteSeparator
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return size + 1, nil
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}
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func (f *FieldRow) String() string {
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return fmt.Sprintf("Field: %d Name: %s", f.index, f.name)
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}
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func NewFieldRow(index uint16, name string) *FieldRow {
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return &FieldRow{
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index: index,
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name: name,
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}
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}
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func NewFieldRowKV(key, value []byte) (*FieldRow, error) {
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rv := FieldRow{}
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buf := bytes.NewBuffer(key)
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_, err := buf.ReadByte() // type
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if err != nil {
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return nil, err
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}
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err = binary.Read(buf, binary.LittleEndian, &rv.index)
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if err != nil {
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return nil, err
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}
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buf = bytes.NewBuffer(value)
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rv.name, err = buf.ReadString(ByteSeparator)
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if err != nil {
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return nil, err
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}
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rv.name = rv.name[:len(rv.name)-1] // trim off separator byte
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return &rv, nil
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}
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// DICTIONARY
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const DictionaryRowMaxValueSize = binary.MaxVarintLen64
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type DictionaryRow struct {
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field uint16
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term []byte
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count uint64
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}
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func (dr *DictionaryRow) Key() []byte {
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buf := make([]byte, dr.KeySize())
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size, _ := dr.KeyTo(buf)
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return buf[:size]
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}
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func (dr *DictionaryRow) KeySize() int {
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return len(dr.term) + 3
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}
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func (dr *DictionaryRow) KeyTo(buf []byte) (int, error) {
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buf[0] = 'd'
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binary.LittleEndian.PutUint16(buf[1:3], dr.field)
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size := copy(buf[3:], dr.term)
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return size + 3, nil
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}
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func (dr *DictionaryRow) Value() []byte {
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buf := make([]byte, dr.ValueSize())
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size, _ := dr.ValueTo(buf)
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return buf[:size]
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}
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func (dr *DictionaryRow) ValueSize() int {
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return DictionaryRowMaxValueSize
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}
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func (dr *DictionaryRow) ValueTo(buf []byte) (int, error) {
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used := binary.PutUvarint(buf, dr.count)
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return used, nil
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}
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func (dr *DictionaryRow) String() string {
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return fmt.Sprintf("Dictionary Term: `%s` Field: %d Count: %d ", string(dr.term), dr.field, dr.count)
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}
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func NewDictionaryRow(term []byte, field uint16, count uint64) *DictionaryRow {
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return &DictionaryRow{
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term: term,
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field: field,
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count: count,
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}
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}
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func NewDictionaryRowKV(key, value []byte) (*DictionaryRow, error) {
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rv, err := NewDictionaryRowK(key)
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if err != nil {
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return nil, err
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}
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err = rv.parseDictionaryV(value)
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if err != nil {
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return nil, err
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}
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return rv, nil
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}
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func NewDictionaryRowK(key []byte) (*DictionaryRow, error) {
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rv := DictionaryRow{}
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buf := bytes.NewBuffer(key)
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_, err := buf.ReadByte() // type
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if err != nil {
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return nil, err
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}
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err = binary.Read(buf, binary.LittleEndian, &rv.field)
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if err != nil {
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return nil, err
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}
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rv.term, err = buf.ReadBytes(ByteSeparator)
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// there is no separator expected here, should get EOF
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if err != io.EOF {
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return nil, err
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}
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return &rv, nil
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}
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func (dr *DictionaryRow) parseDictionaryV(value []byte) error {
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buf := bytes.NewBuffer(value)
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count, err := binary.ReadUvarint(buf)
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if err != nil {
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return err
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}
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dr.count = count
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return nil
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}
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// TERM FIELD FREQUENCY
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type TermVector struct {
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field uint16
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arrayPositions []uint64
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pos uint64
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start uint64
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end uint64
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}
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func (tv *TermVector) String() string {
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return fmt.Sprintf("Field: %d Pos: %d Start: %d End %d ArrayPositions: %#v", tv.field, tv.pos, tv.start, tv.end, tv.arrayPositions)
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}
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type TermFrequencyRow struct {
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term []byte
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doc []byte
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freq uint64
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vectors []*TermVector
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norm float32
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field uint16
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}
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func (tfr *TermFrequencyRow) Term() []byte {
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return tfr.term
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}
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func (tfr *TermFrequencyRow) Freq() uint64 {
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return tfr.freq
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}
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func (tfr *TermFrequencyRow) ScanPrefixForField() []byte {
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buf := make([]byte, 3)
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buf[0] = 't'
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binary.LittleEndian.PutUint16(buf[1:3], tfr.field)
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return buf
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}
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func (tfr *TermFrequencyRow) ScanPrefixForFieldTermPrefix() []byte {
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buf := make([]byte, 3+len(tfr.term))
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buf[0] = 't'
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binary.LittleEndian.PutUint16(buf[1:3], tfr.field)
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copy(buf[3:], tfr.term)
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return buf
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}
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func (tfr *TermFrequencyRow) ScanPrefixForFieldTerm() []byte {
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buf := make([]byte, 3+len(tfr.term)+1)
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buf[0] = 't'
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binary.LittleEndian.PutUint16(buf[1:3], tfr.field)
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termLen := copy(buf[3:], tfr.term)
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buf[3+termLen] = ByteSeparator
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return buf
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}
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func (tfr *TermFrequencyRow) Key() []byte {
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buf := make([]byte, tfr.KeySize())
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size, _ := tfr.KeyTo(buf)
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return buf[:size]
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}
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func (tfr *TermFrequencyRow) KeySize() int {
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return 3 + len(tfr.term) + 1 + len(tfr.doc)
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}
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func (tfr *TermFrequencyRow) KeyTo(buf []byte) (int, error) {
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buf[0] = 't'
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binary.LittleEndian.PutUint16(buf[1:3], tfr.field)
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termLen := copy(buf[3:], tfr.term)
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buf[3+termLen] = ByteSeparator
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docLen := copy(buf[3+termLen+1:], tfr.doc)
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return 3 + termLen + 1 + docLen, nil
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}
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func (tfr *TermFrequencyRow) DictionaryRowKey() []byte {
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dr := NewDictionaryRow(tfr.term, tfr.field, 0)
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return dr.Key()
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}
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func (tfr *TermFrequencyRow) DictionaryRowKeySize() int {
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dr := NewDictionaryRow(tfr.term, tfr.field, 0)
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return dr.KeySize()
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}
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func (tfr *TermFrequencyRow) DictionaryRowKeyTo(buf []byte) (int, error) {
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dr := NewDictionaryRow(tfr.term, tfr.field, 0)
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return dr.KeyTo(buf)
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}
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func (tfr *TermFrequencyRow) Value() []byte {
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buf := make([]byte, tfr.ValueSize())
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size, _ := tfr.ValueTo(buf)
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return buf[:size]
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}
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func (tfr *TermFrequencyRow) ValueSize() int {
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bufLen := binary.MaxVarintLen64 + binary.MaxVarintLen64
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for _, vector := range tfr.vectors {
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bufLen += (binary.MaxVarintLen64 * 4) + (1+len(vector.arrayPositions))*binary.MaxVarintLen64
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}
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return bufLen
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}
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func (tfr *TermFrequencyRow) ValueTo(buf []byte) (int, error) {
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used := binary.PutUvarint(buf[:binary.MaxVarintLen64], tfr.freq)
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normuint32 := math.Float32bits(tfr.norm)
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newbuf := buf[used : used+binary.MaxVarintLen64]
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used += binary.PutUvarint(newbuf, uint64(normuint32))
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for _, vector := range tfr.vectors {
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], uint64(vector.field))
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], vector.pos)
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], vector.start)
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], vector.end)
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], uint64(len(vector.arrayPositions)))
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for _, arrayPosition := range vector.arrayPositions {
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used += binary.PutUvarint(buf[used:used+binary.MaxVarintLen64], arrayPosition)
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}
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}
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return used, nil
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}
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func (tfr *TermFrequencyRow) String() string {
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return fmt.Sprintf("Term: `%s` Field: %d DocId: `%s` Frequency: %d Norm: %f Vectors: %v", string(tfr.term), tfr.field, string(tfr.doc), tfr.freq, tfr.norm, tfr.vectors)
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}
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func NewTermFrequencyRow(term []byte, field uint16, docID []byte, freq uint64, norm float32) *TermFrequencyRow {
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return &TermFrequencyRow{
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term: term,
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field: field,
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doc: docID,
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freq: freq,
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norm: norm,
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}
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}
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func NewTermFrequencyRowWithTermVectors(term []byte, field uint16, docID []byte, freq uint64, norm float32, vectors []*TermVector) *TermFrequencyRow {
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return &TermFrequencyRow{
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term: term,
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field: field,
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doc: docID,
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freq: freq,
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norm: norm,
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vectors: vectors,
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}
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}
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func NewTermFrequencyRowK(key []byte) (*TermFrequencyRow, error) {
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rv := &TermFrequencyRow{}
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err := rv.parseK(key)
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if err != nil {
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return nil, err
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}
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return rv, nil
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}
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func (tfr *TermFrequencyRow) parseK(key []byte) error {
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keyLen := len(key)
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if keyLen < 3 {
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return fmt.Errorf("invalid term frequency key, no valid field")
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}
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tfr.field = binary.LittleEndian.Uint16(key[1:3])
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termEndPos := bytes.IndexByte(key[3:], ByteSeparator)
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if termEndPos < 0 {
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return fmt.Errorf("invalid term frequency key, no byte separator terminating term")
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}
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tfr.term = key[3 : 3+termEndPos]
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docLen := keyLen - (3 + termEndPos + 1)
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if docLen < 1 {
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return fmt.Errorf("invalid term frequency key, empty docid")
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}
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tfr.doc = key[3+termEndPos+1:]
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return nil
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}
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func (tfr *TermFrequencyRow) parseKDoc(key []byte) error {
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termEndPos := bytes.IndexByte(key[3:], ByteSeparator)
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if termEndPos < 0 {
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return fmt.Errorf("invalid term frequency key, no byte separator terminating term")
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}
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tfr.doc = key[3+termEndPos+1:]
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if len(tfr.doc) <= 0 {
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return fmt.Errorf("invalid term frequency key, empty docid")
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}
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return nil
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}
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func (tfr *TermFrequencyRow) parseV(value []byte) error {
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var bytesRead int
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tfr.freq, bytesRead = binary.Uvarint(value)
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if bytesRead <= 0 {
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return fmt.Errorf("invalid term frequency value, invalid frequency")
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}
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currOffset := bytesRead
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var norm uint64
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norm, bytesRead = binary.Uvarint(value[currOffset:])
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if bytesRead <= 0 {
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return fmt.Errorf("invalid term frequency value, no norm")
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}
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currOffset += bytesRead
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tfr.norm = math.Float32frombits(uint32(norm))
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tfr.vectors = nil
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var field uint64
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|
field, bytesRead = binary.Uvarint(value[currOffset:])
|
|
for bytesRead > 0 {
|
|
currOffset += bytesRead
|
|
tv := TermVector{}
|
|
tv.field = uint16(field)
|
|
// at this point we expect at least one term vector
|
|
if tfr.vectors == nil {
|
|
tfr.vectors = make([]*TermVector, 0)
|
|
}
|
|
|
|
tv.pos, bytesRead = binary.Uvarint(value[currOffset:])
|
|
if bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector contains no position")
|
|
}
|
|
currOffset += bytesRead
|
|
|
|
tv.start, bytesRead = binary.Uvarint(value[currOffset:])
|
|
if bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector contains no start")
|
|
}
|
|
currOffset += bytesRead
|
|
|
|
tv.end, bytesRead = binary.Uvarint(value[currOffset:])
|
|
if bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector contains no end")
|
|
}
|
|
currOffset += bytesRead
|
|
|
|
var arrayPositionsLen uint64 = 0
|
|
arrayPositionsLen, bytesRead = binary.Uvarint(value[currOffset:])
|
|
if bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector contains no arrayPositionLen")
|
|
}
|
|
currOffset += bytesRead
|
|
|
|
if arrayPositionsLen > 0 {
|
|
tv.arrayPositions = make([]uint64, arrayPositionsLen)
|
|
for i := 0; uint64(i) < arrayPositionsLen; i++ {
|
|
tv.arrayPositions[i], bytesRead = binary.Uvarint(value[currOffset:])
|
|
if bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector contains no arrayPosition of index %d", i)
|
|
}
|
|
currOffset += bytesRead
|
|
}
|
|
}
|
|
|
|
tfr.vectors = append(tfr.vectors, &tv)
|
|
// try to read next record (may not exist)
|
|
field, bytesRead = binary.Uvarint(value[currOffset:])
|
|
}
|
|
if len(value[currOffset:]) > 0 && bytesRead <= 0 {
|
|
return fmt.Errorf("invalid term frequency value, vector field invalid")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func NewTermFrequencyRowKV(key, value []byte) (*TermFrequencyRow, error) {
|
|
rv, err := NewTermFrequencyRowK(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = rv.parseV(value)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return rv, nil
|
|
|
|
}
|
|
|
|
type BackIndexRow struct {
|
|
doc []byte
|
|
termEntries []*BackIndexTermEntry
|
|
storedEntries []*BackIndexStoreEntry
|
|
}
|
|
|
|
func (br *BackIndexRow) AllTermKeys() [][]byte {
|
|
if br == nil {
|
|
return nil
|
|
}
|
|
rv := make([][]byte, len(br.termEntries))
|
|
for i, termEntry := range br.termEntries {
|
|
termRow := NewTermFrequencyRow([]byte(termEntry.GetTerm()), uint16(termEntry.GetField()), br.doc, 0, 0)
|
|
rv[i] = termRow.Key()
|
|
}
|
|
return rv
|
|
}
|
|
|
|
func (br *BackIndexRow) AllStoredKeys() [][]byte {
|
|
if br == nil {
|
|
return nil
|
|
}
|
|
rv := make([][]byte, len(br.storedEntries))
|
|
for i, storedEntry := range br.storedEntries {
|
|
storedRow := NewStoredRow(br.doc, uint16(storedEntry.GetField()), storedEntry.GetArrayPositions(), 'x', []byte{})
|
|
rv[i] = storedRow.Key()
|
|
}
|
|
return rv
|
|
}
|
|
|
|
func (br *BackIndexRow) Key() []byte {
|
|
buf := make([]byte, br.KeySize())
|
|
size, _ := br.KeyTo(buf)
|
|
return buf[:size]
|
|
}
|
|
|
|
func (br *BackIndexRow) KeySize() int {
|
|
return len(br.doc) + 1
|
|
}
|
|
|
|
func (br *BackIndexRow) KeyTo(buf []byte) (int, error) {
|
|
buf[0] = 'b'
|
|
used := copy(buf[1:], br.doc)
|
|
return used + 1, nil
|
|
}
|
|
|
|
func (br *BackIndexRow) Value() []byte {
|
|
buf := make([]byte, br.ValueSize())
|
|
size, _ := br.ValueTo(buf)
|
|
return buf[:size]
|
|
}
|
|
|
|
func (br *BackIndexRow) ValueSize() int {
|
|
birv := &BackIndexRowValue{
|
|
TermEntries: br.termEntries,
|
|
StoredEntries: br.storedEntries,
|
|
}
|
|
return birv.Size()
|
|
}
|
|
|
|
func (br *BackIndexRow) ValueTo(buf []byte) (int, error) {
|
|
birv := &BackIndexRowValue{
|
|
TermEntries: br.termEntries,
|
|
StoredEntries: br.storedEntries,
|
|
}
|
|
return birv.MarshalTo(buf)
|
|
}
|
|
|
|
func (br *BackIndexRow) String() string {
|
|
return fmt.Sprintf("Backindex DocId: `%s` Term Entries: %v, Stored Entries: %v", string(br.doc), br.termEntries, br.storedEntries)
|
|
}
|
|
|
|
func NewBackIndexRow(docID []byte, entries []*BackIndexTermEntry, storedFields []*BackIndexStoreEntry) *BackIndexRow {
|
|
return &BackIndexRow{
|
|
doc: docID,
|
|
termEntries: entries,
|
|
storedEntries: storedFields,
|
|
}
|
|
}
|
|
|
|
func NewBackIndexRowKV(key, value []byte) (*BackIndexRow, error) {
|
|
rv := BackIndexRow{}
|
|
|
|
buf := bytes.NewBuffer(key)
|
|
_, err := buf.ReadByte() // type
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rv.doc, err = buf.ReadBytes(ByteSeparator)
|
|
if err == io.EOF && len(rv.doc) < 1 {
|
|
err = fmt.Errorf("invalid doc length 0 - % x", key)
|
|
}
|
|
if err != nil && err != io.EOF {
|
|
return nil, err
|
|
} else if err == nil {
|
|
rv.doc = rv.doc[:len(rv.doc)-1] // trim off separator byte
|
|
}
|
|
|
|
var birv BackIndexRowValue
|
|
err = proto.Unmarshal(value, &birv)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rv.termEntries = birv.TermEntries
|
|
rv.storedEntries = birv.StoredEntries
|
|
|
|
return &rv, nil
|
|
}
|
|
|
|
// STORED
|
|
|
|
type StoredRow struct {
|
|
doc []byte
|
|
field uint16
|
|
arrayPositions []uint64
|
|
typ byte
|
|
value []byte
|
|
}
|
|
|
|
func (s *StoredRow) Key() []byte {
|
|
buf := make([]byte, s.KeySize())
|
|
size, _ := s.KeyTo(buf)
|
|
return buf[0:size]
|
|
}
|
|
|
|
func (s *StoredRow) KeySize() int {
|
|
return 1 + len(s.doc) + 1 + 2 + (binary.MaxVarintLen64 * len(s.arrayPositions))
|
|
}
|
|
|
|
func (s *StoredRow) KeyTo(buf []byte) (int, error) {
|
|
docLen := len(s.doc)
|
|
buf[0] = 's'
|
|
copy(buf[1:], s.doc)
|
|
buf[1+docLen] = ByteSeparator
|
|
binary.LittleEndian.PutUint16(buf[1+docLen+1:], s.field)
|
|
bytesUsed := 1 + docLen + 1 + 2
|
|
for _, arrayPosition := range s.arrayPositions {
|
|
varbytes := binary.PutUvarint(buf[bytesUsed:], arrayPosition)
|
|
bytesUsed += varbytes
|
|
}
|
|
return bytesUsed, nil
|
|
}
|
|
|
|
func (s *StoredRow) Value() []byte {
|
|
buf := make([]byte, s.ValueSize())
|
|
size, _ := s.ValueTo(buf)
|
|
return buf[:size]
|
|
}
|
|
|
|
func (s *StoredRow) ValueSize() int {
|
|
return len(s.value) + 1
|
|
}
|
|
|
|
func (s *StoredRow) ValueTo(buf []byte) (int, error) {
|
|
buf[0] = s.typ
|
|
used := copy(buf[1:], s.value)
|
|
return used + 1, nil
|
|
}
|
|
|
|
func (s *StoredRow) String() string {
|
|
return fmt.Sprintf("Document: %s Field %d, Array Positions: %v, Type: %s Value: %s", s.doc, s.field, s.arrayPositions, string(s.typ), s.value)
|
|
}
|
|
|
|
func (s *StoredRow) ScanPrefixForDoc() []byte {
|
|
docLen := len(s.doc)
|
|
buf := make([]byte, 1+docLen+1)
|
|
buf[0] = 's'
|
|
copy(buf[1:], s.doc)
|
|
buf[1+docLen] = ByteSeparator
|
|
return buf
|
|
}
|
|
|
|
func NewStoredRow(docID []byte, field uint16, arrayPositions []uint64, typ byte, value []byte) *StoredRow {
|
|
return &StoredRow{
|
|
doc: docID,
|
|
field: field,
|
|
arrayPositions: arrayPositions,
|
|
typ: typ,
|
|
value: value,
|
|
}
|
|
}
|
|
|
|
func NewStoredRowK(key []byte) (*StoredRow, error) {
|
|
rv := StoredRow{}
|
|
|
|
buf := bytes.NewBuffer(key)
|
|
_, err := buf.ReadByte() // type
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rv.doc, err = buf.ReadBytes(ByteSeparator)
|
|
if len(rv.doc) < 2 { // 1 for min doc id length, 1 for separator
|
|
err = fmt.Errorf("invalid doc length 0")
|
|
return nil, err
|
|
}
|
|
|
|
rv.doc = rv.doc[:len(rv.doc)-1] // trim off separator byte
|
|
|
|
err = binary.Read(buf, binary.LittleEndian, &rv.field)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
rv.arrayPositions = make([]uint64, 0)
|
|
nextArrayPos, err := binary.ReadUvarint(buf)
|
|
for err == nil {
|
|
rv.arrayPositions = append(rv.arrayPositions, nextArrayPos)
|
|
nextArrayPos, err = binary.ReadUvarint(buf)
|
|
}
|
|
return &rv, nil
|
|
}
|
|
|
|
func NewStoredRowKV(key, value []byte) (*StoredRow, error) {
|
|
rv, err := NewStoredRowK(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rv.typ = value[0]
|
|
rv.value = value[1:]
|
|
return rv, nil
|
|
}
|