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fixed_size.go
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fixed_size.go
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/*
Copyright 2022 Erigon contributors
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 bitmapdb
import (
"bufio"
"encoding/binary"
"fmt"
"os"
"path/filepath"
"reflect"
"time"
"unsafe"
"github.com/c2h5oh/datasize"
mmap2 "github.com/edsrzf/mmap-go"
"github.com/ledgerwatch/log/v3"
)
type FixedSizeBitmaps struct {
f *os.File
filePath, fileName string
data []uint64
metaData []byte
amount uint64
version uint8
m mmap2.MMap
bitsPerBitmap int
size int
modTime time.Time
}
func OpenFixedSizeBitmaps(filePath string, bitsPerBitmap int) (*FixedSizeBitmaps, error) {
_, fName := filepath.Split(filePath)
idx := &FixedSizeBitmaps{
filePath: filePath,
fileName: fName,
bitsPerBitmap: bitsPerBitmap,
}
var err error
idx.f, err = os.Open(filePath)
if err != nil {
return nil, fmt.Errorf("OpenFile: %w", err)
}
var stat os.FileInfo
if stat, err = idx.f.Stat(); err != nil {
return nil, err
}
idx.size = int(stat.Size())
idx.modTime = stat.ModTime()
idx.m, err = mmap2.MapRegion(idx.f, idx.size, mmap2.RDONLY, 0, 0)
if err != nil {
return nil, err
}
idx.metaData = idx.m[:MetaHeaderSize]
idx.data = castToArrU64(idx.m[MetaHeaderSize:])
idx.version = idx.metaData[0]
idx.amount = binary.BigEndian.Uint64(idx.metaData[1 : 8+1])
return idx, nil
}
func (bm *FixedSizeBitmaps) FileName() string { return bm.fileName }
func (bm *FixedSizeBitmaps) FilePath() string { return bm.filePath }
func (bm *FixedSizeBitmaps) Close() {
if bm.m != nil {
if err := bm.m.Unmap(); err != nil {
log.Trace("unmap", "err", err, "file", bm.FileName())
}
bm.m = nil
}
if bm.f != nil {
if err := bm.f.Close(); err != nil {
log.Trace("close", "err", err, "file", bm.FileName())
}
bm.f = nil
}
}
func (bm *FixedSizeBitmaps) At(item uint64) (res []uint64, err error) {
if item > bm.amount {
return nil, fmt.Errorf("too big item number: %d > %d", item, bm.amount)
}
n := bm.bitsPerBitmap * int(item)
blkFrom, bitFrom := n/64, n%64
blkTo := (n+bm.bitsPerBitmap)/64 + 1
bitTo := 64
var j uint64
for i := blkFrom; i < blkTo; i++ {
if i == blkTo-1 {
bitTo = (n + bm.bitsPerBitmap) % 64
}
for bit := bitFrom; bit < bitTo; bit++ {
if bm.data[i]&(1<<bit) != 0 {
res = append(res, j)
}
j++
}
bitFrom = 0
}
return res, nil
}
func (bm *FixedSizeBitmaps) First2At(item, after uint64) (fst uint64, snd uint64, ok, ok2 bool, err error) {
if item > bm.amount {
return 0, 0, false, false, fmt.Errorf("too big item number: %d > %d", item, bm.amount)
}
n := bm.bitsPerBitmap * int(item)
blkFrom, bitFrom := n/64, n%64
blkTo := (n+bm.bitsPerBitmap)/64 + 1
bitTo := 64
var j uint64
for i := blkFrom; i < blkTo; i++ {
if i == blkTo-1 {
bitTo = (n + bm.bitsPerBitmap) % 64
}
for bit := bitFrom; bit < bitTo; bit++ {
if bm.data[i]&(1<<bit) != 0 {
if j >= after {
if !ok {
ok = true
fst = j
} else {
ok2 = true
snd = j
return
}
}
}
j++
}
bitFrom = 0
}
return
}
type FixedSizeBitmapsWriter struct {
f *os.File
indexFile, tmpIdxFilePath string
data []uint64 // slice of correct size for the index to work with
metaData []byte
m mmap2.MMap
version uint8
amount uint64
size int
bitsPerBitmap uint64
logger log.Logger
noFsync bool // fsync is enabled by default, but tests can manually disable
}
const MetaHeaderSize = 64
func NewFixedSizeBitmapsWriter(indexFile string, bitsPerBitmap int, amount uint64, logger log.Logger) (*FixedSizeBitmapsWriter, error) {
pageSize := os.Getpagesize()
//TODO: use math.SafeMul()
bytesAmount := MetaHeaderSize + (bitsPerBitmap*int(amount))/8
size := (bytesAmount/pageSize + 1) * pageSize // must be page-size-aligned
idx := &FixedSizeBitmapsWriter{
indexFile: indexFile,
tmpIdxFilePath: indexFile + ".tmp",
bitsPerBitmap: uint64(bitsPerBitmap),
size: size,
amount: amount,
version: 1,
logger: logger,
}
_ = os.Remove(idx.tmpIdxFilePath)
var err error
idx.f, err = os.Create(idx.tmpIdxFilePath)
if err != nil {
return nil, err
}
if err := growFileToSize(idx.f, idx.size); err != nil {
return nil, err
}
idx.m, err = mmap2.MapRegion(idx.f, idx.size, mmap2.RDWR, 0, 0)
if err != nil {
return nil, err
}
idx.metaData = idx.m[:MetaHeaderSize]
idx.data = castToArrU64(idx.m[MetaHeaderSize:])
//if err := mmap.MadviseNormal(idx.m); err != nil {
// return nil, err
//}
idx.metaData[0] = idx.version
binary.BigEndian.PutUint64(idx.metaData[1:], idx.amount)
idx.amount = binary.BigEndian.Uint64(idx.metaData[1 : 8+1])
return idx, nil
}
func (w *FixedSizeBitmapsWriter) Close() {
if w.m != nil {
if err := w.m.Unmap(); err != nil {
log.Trace("unmap", "err", err, "file", w.f.Name())
}
w.m = nil
}
if w.f != nil {
if err := w.f.Close(); err != nil {
log.Trace("close", "err", err, "file", w.f.Name())
}
w.f = nil
}
}
func growFileToSize(f *os.File, size int) error {
pageSize := os.Getpagesize()
pages := size / pageSize
wr := bufio.NewWriterSize(f, int(4*datasize.MB))
page := make([]byte, pageSize)
for i := 0; i < pages; i++ {
if _, err := wr.Write(page); err != nil {
return err
}
}
if err := wr.Flush(); err != nil {
return err
}
return nil
}
// Create a []uint64 view of the file
func castToArrU64(in []byte) []uint64 {
var view []uint64
header := (*reflect.SliceHeader)(unsafe.Pointer(&view))
header.Data = (*reflect.SliceHeader)(unsafe.Pointer(&in)).Data
header.Len = len(in) / 8
header.Cap = header.Len
return view
}
func (w *FixedSizeBitmapsWriter) AddArray(item uint64, listOfValues []uint64) error {
if item > w.amount {
return fmt.Errorf("too big item number: %d > %d", item, w.amount)
}
offset := item * w.bitsPerBitmap
for _, v := range listOfValues {
if v > w.bitsPerBitmap {
return fmt.Errorf("too big value: %d > %d", v, w.bitsPerBitmap)
}
n := offset + v
blkAt, bitAt := int(n/64), int(n%64)
if blkAt > len(w.data) {
return fmt.Errorf("too big value: %d, %d, max: %d", item, listOfValues, len(w.data))
}
w.data[blkAt] |= (1 << bitAt)
}
return nil
}
func (w *FixedSizeBitmapsWriter) Build() error {
if err := w.m.Flush(); err != nil {
return err
}
if err := w.fsync(); err != nil {
return err
}
if err := w.m.Unmap(); err != nil {
return err
}
w.m = nil
if err := w.f.Close(); err != nil {
return err
}
w.f = nil
_ = os.Remove(w.indexFile)
if err := os.Rename(w.tmpIdxFilePath, w.indexFile); err != nil {
return err
}
return nil
}
func (w *FixedSizeBitmapsWriter) DisableFsync() { w.noFsync = true }
// fsync - other processes/goroutines must see only "fully-complete" (valid) files. No partial-writes.
// To achieve it: write to .tmp file then `rename` when file is ready.
// Machine may power-off right after `rename` - it means `fsync` must be before `rename`
func (w *FixedSizeBitmapsWriter) fsync() error {
if w.noFsync {
return nil
}
if err := w.f.Sync(); err != nil {
w.logger.Warn("couldn't fsync", "err", err, "file", w.tmpIdxFilePath)
return err
}
return nil
}