/
meta_data.go
145 lines (119 loc) · 3.67 KB
/
meta_data.go
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/*
Copyright 2023 Huawei Cloud Computing Technologies Co., Ltd.
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 logstore
import (
"encoding/binary"
"fmt"
"hash/crc32"
)
const (
META_DATA_N_BYTES int32 = 8 + 8 + 8 + 8 + 8 + 4 + 4
META_STORE_N_BYTES int32 = META_DATA_N_BYTES + 4
META_DATA_SIZE int32 = META_STORE_N_BYTES + 4
)
var crc32CastagnoliTable = crc32.MakeTable(crc32.Castagnoli)
type MetaData struct {
contentBlockLength int32
blockRecordsCount int32
blockIndex int64
minTimestamp int64
maxTimestamp int64
minSeq int64
maxSeq int64
contentBlockOffset int64
}
func NewMetaData(blockIndex int64, data []byte, offset int32) (*MetaData, error) {
checksum := binary.LittleEndian.Uint32(data[offset+META_DATA_N_BYTES : offset+META_STORE_N_BYTES])
if crc32.Checksum(data[offset:offset+META_DATA_N_BYTES], crc32CastagnoliTable) != checksum {
return nil, fmt.Errorf("blockindex: %d, meta block checksum invalid", blockIndex)
}
m := &MetaData{
blockIndex: blockIndex,
maxTimestamp: int64(binary.LittleEndian.Uint64(data[offset : offset+8])),
minTimestamp: int64(binary.LittleEndian.Uint64(data[offset+8 : offset+16])),
maxSeq: int64(binary.LittleEndian.Uint64(data[offset+16 : offset+24])),
minSeq: int64(binary.LittleEndian.Uint64(data[offset+24 : offset+32])),
contentBlockOffset: int64(binary.LittleEndian.Uint64(data[offset+32 : offset+40])),
contentBlockLength: int32(binary.LittleEndian.Uint32(data[offset+40 : offset+44])),
blockRecordsCount: int32(binary.LittleEndian.Uint32(data[offset+44 : offset+48])),
}
return m, nil
}
func (m *MetaData) GetBlockIndex() int64 {
return m.blockIndex
}
func (m *MetaData) GetContentBlockOffset() int64 {
return m.contentBlockOffset
}
func (m *MetaData) GetContentBlockLength() int32 {
return m.contentBlockLength
}
func (m *MetaData) GetMinTime() int64 {
return m.minTimestamp
}
func (m *MetaData) GetMaxTime() int64 {
return m.maxTimestamp
}
type MetaDataInfo interface {
GetMinTime() int64
GetMaxTime() int64
}
type MetaControl interface {
Push(MetaDataInfo)
Pop() (MetaDataInfo, bool)
IsEmpty() bool
}
func NewMetaControl(isQueue bool, count int) MetaControl {
if isQueue {
meta := make(MetaQueue, 0, count)
return &meta
} else {
meta := make(MetaStack, 0, count)
return &meta
}
}
type MetaQueue []MetaDataInfo
func (q *MetaQueue) Push(v MetaDataInfo) {
*q = append(*q, v)
}
func (q *MetaQueue) Pop() (MetaDataInfo, bool) {
if q.IsEmpty() {
return nil, false
}
head := (*q)[0]
*q = (*q)[1:]
return head, true
}
func (q *MetaQueue) IsEmpty() bool {
return len((*q)) == 0
}
type MetaStack []MetaDataInfo
func (s *MetaStack) IsEmpty() bool {
return len((*s)) == 0
}
func (s *MetaStack) Push(value MetaDataInfo) {
*s = append(*s, value)
}
func (s *MetaStack) Pop() (MetaDataInfo, bool) {
if s.IsEmpty() {
return nil, false
}
index := len(*s) - 1
value := (*s)[index]
*s = (*s)[:index]
return value, true
}
type MetaDatas []*MetaData
func (a MetaDatas) Len() int { return len(a) }
func (a MetaDatas) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a MetaDatas) Less(i, j int) bool { return a[i].blockIndex < a[j].blockIndex }