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tssp_file_page_cache_reader.go
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/
tssp_file_page_cache_reader.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 immutable
import (
"fmt"
"github.com/openGemini/openGemini/lib/readcache"
"go.uber.org/zap"
)
type PageCacheReader struct {
r *tsspFileReader
trailer *Trailer
init bool
startOffset int64
endOffset int64
maxPageId int64
maxPageOffset int64
read func(offset int64, size uint32, buf *[]byte, ioPriority int) ([]byte, *readcache.CachePage, error)
}
func NewPageCacheReader(t *Trailer, r *tsspFileReader) *PageCacheReader {
pcr := &PageCacheReader{
trailer: t,
r: r,
}
if readcache.IsPageSizeVariable {
pcr.read = pcr.ReadVariablePageSize
} else {
pcr.read = pcr.ReadFixPageSize
}
return pcr
}
func (pcr *PageCacheReader) Init() {
pcr.startOffset = pcr.trailer.dataOffset
pcr.endOffset, _ = pcr.trailer.metaOffsetSize()
pcr.maxPageId, pcr.maxPageOffset = pcr.GetMaxPageIdAndOffset()
}
// get all cache pageIds containning bytes from start to start + size
func (pcr *PageCacheReader) GetCachePageIdsAndOffsets(start int64, size uint32) ([]int64, []int64, error) {
end := (start + int64(size))
if start < pcr.startOffset || start >= pcr.endOffset || end < pcr.startOffset || end > pcr.endOffset {
return nil, nil, fmt.Errorf("invalid read offset of GetCachePageIdsAndOffsets() start:%v end:%v startOffset:%v endOffset:%v", start, end, pcr.startOffset, pcr.endOffset)
}
pageIds := make([]int64, 0, int64(size)/readcache.PageSize+1)
pageOffsets := make([]int64, 0, int64(size)/readcache.PageSize+1)
startPageId := ((start - pcr.startOffset) / readcache.PageSize) + 1
startPageOffset := (startPageId-1)*readcache.PageSize + pcr.startOffset
for ; startPageOffset < end; startPageOffset += readcache.PageSize {
pageIds = append(pageIds, startPageId)
pageOffsets = append(pageOffsets, startPageOffset)
startPageId++
}
return pageIds, pageOffsets, nil
}
func (pcr *PageCacheReader) GetMaxPageIdAndOffset() (int64, int64) {
over := (pcr.endOffset - pcr.startOffset) % readcache.PageSize
if over > 0 {
over = 1
}
endPageId := (pcr.endOffset-pcr.startOffset)/readcache.PageSize + over
endPageOffset := (endPageId-1)*readcache.PageSize + pcr.startOffset
return endPageId, endPageOffset
}
func (pcr *PageCacheReader) ReadSinglePage(cacheKey string, pageOffset int64, pageSize int64, buf *[]byte, ioPriority int) (*readcache.CachePage, []byte, error) {
cacheIns := readcache.GetReadDataCacheIns()
var pageCache *readcache.CachePage
var ok bool
if value, isGet := cacheIns.GetPageCache(cacheKey); isGet {
pageCache, ok = value.(*readcache.CachePage)
if !ok {
return nil, nil, fmt.Errorf("cacheValue is not a page")
}
return pageCache, pageCache.Value, nil
} else {
pageCache := readcache.CachePagePool.Get()
pageCache.Ref()
tempPage, err := pcr.r.Read(pageOffset, uint32(pageSize), &pageCache.Value, ioPriority)
if err != nil {
pageCache.Unref()
log.Error("read TSSPFile failed", zap.Error(err))
return nil, nil, err
}
pageCache.Size = int64(len(tempPage))
cacheIns.AddPageCache(cacheKey, pageCache, int64(len(tempPage)))
return pageCache, tempPage, nil
}
}
func (pcr *PageCacheReader) Read(offset int64, size uint32, buf *[]byte, ioPriority int) ([]byte, *readcache.CachePage, error) {
return pcr.read(offset, size, buf, ioPriority)
}
func (pcr *PageCacheReader) ReadVariablePageSize(offset int64, size uint32, buf *[]byte, ioPriority int) ([]byte, *readcache.CachePage, error) {
var err error
cacheIns := readcache.GetReadDataCacheIns()
cacheKey := cacheIns.CreateCacheKey(pcr.r.FileName(), offset)
var b []byte
var page *readcache.CachePage
var ok bool
if value, isGet := cacheIns.Get(cacheKey); isGet {
page, ok = value.(*readcache.CachePage)
if !ok {
return nil, nil, fmt.Errorf("cacheValue is not a page")
}
if page.Size >= int64(size) {
b = page.Value[:size]
return b, nil, nil
}
}
b, err = pcr.r.Read(offset, size, buf, ioPriority)
if err != nil {
log.Error("read TSSPFile failed", zap.Error(err))
return nil, nil, err
}
cacheIns.AddPage(cacheKey, b, int64(size))
return b, nil, nil
}
// read fileBytes of pages
func (pcr *PageCacheReader) ReadFixPageSize(offset int64, size uint32, buf *[]byte, ioPriority int) ([]byte, *readcache.CachePage, error) {
if !pcr.init {
pcr.Init()
pcr.init = true
}
var err error
var pageBuf []byte
var cachePage *readcache.CachePage
cacheIns := readcache.GetReadDataCacheIns()
pageIds, pageOffsets, err := pcr.GetCachePageIdsAndOffsets(offset, size)
if err != nil || len(pageIds) == 0 {
return nil, nil, err
}
cacheKeys := cacheIns.CreateCacheKeys(pcr.r.FileName(), pageIds)
tempEnd := readcache.PageSize
if int64(size) < readcache.PageSize && len(pageIds) == 1 {
tempEnd = int64(size) + (offset - (pageOffsets)[0])
}
tempPageSize := readcache.PageSize
if (pageIds)[0] == pcr.maxPageId {
tempPageSize = pcr.endOffset - pcr.maxPageOffset
}
// 1. fast: read one page
if len(cacheKeys) == 1 {
cachePage, pageBuf, err = pcr.ReadSinglePage(cacheKeys[0], pageOffsets[0], tempPageSize, buf, ioPriority)
if err != nil {
return nil, nil, err
}
newb := pageBuf[(offset - pageOffsets[0]):tempEnd]
return newb, cachePage, nil
}
*buf = (*buf)[:0]
b := buf
// 2. read multi pages
// 2.1. first page
cachePage, pageBuf, err = pcr.ReadSinglePage(cacheKeys[0], pageOffsets[0], tempPageSize, buf, ioPriority)
if err != nil {
return nil, nil, err
}
*b = append(*b, pageBuf[(offset-pageOffsets[0]):tempEnd]...)
pcr.r.UnrefCachePage(cachePage)
// 2.2. middle pages
for i := 1; i < len(cacheKeys)-1; i++ {
cachePage, pageBuf, err = pcr.ReadSinglePage(cacheKeys[i], pageOffsets[i], readcache.PageSize, buf, ioPriority)
if err != nil {
return nil, nil, err
}
*b = append(*b, pageBuf...)
pcr.r.UnrefCachePage(cachePage)
}
// 2.3. last page
if pageIds[len(pageIds)-1] == pcr.maxPageId {
tempPageSize = pcr.endOffset - pcr.maxPageOffset
}
cachePage, pageBuf, err = pcr.ReadSinglePage(cacheKeys[len(cacheKeys)-1], pageOffsets[len(pageOffsets)-1], tempPageSize, buf, ioPriority)
if err != nil {
return nil, nil, err
}
*b = append(*b, pageBuf[:int64(size)-int64(len(*b))]...)
pcr.r.UnrefCachePage(cachePage)
return *b, nil, nil
}