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blockfile_helper.go
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/
blockfile_helper.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package fsblkstorage
import (
"io/ioutil"
"os"
"strconv"
"strings"
"github.com/davecgh/go-spew/spew"
"github.com/hyperledger/fabric/protos/common"
"github.com/pkg/errors"
)
// constructCheckpointInfoFromBlockFiles scans the last blockfile (if any) and construct the checkpoint info
// if the last file contains no block or only a partially written block (potentially because of a crash while writing block to the file),
// this scans the second last file (if any)
func constructCheckpointInfoFromBlockFiles(rootDir string) (*checkpointInfo, error) {
logger.Debugf("Retrieving checkpoint info from block files")
var lastFileNum int
var numBlocksInFile int
var endOffsetLastBlock int64
var lastBlockNumber uint64
var lastBlockBytes []byte
var lastBlock *common.Block
var err error
if lastFileNum, err = retrieveLastFileSuffix(rootDir); err != nil {
return nil, err
}
logger.Debugf("Last file number found = %d", lastFileNum)
if lastFileNum == -1 {
cpInfo := &checkpointInfo{0, 0, true, 0}
logger.Debugf("No block file found")
return cpInfo, nil
}
fileInfo := getFileInfoOrPanic(rootDir, lastFileNum)
logger.Debugf("Last Block file info: FileName=[%s], FileSize=[%d]", fileInfo.Name(), fileInfo.Size())
if lastBlockBytes, endOffsetLastBlock, numBlocksInFile, err = scanForLastCompleteBlock(rootDir, lastFileNum, 0); err != nil {
logger.Errorf("Error scanning last file [num=%d]: %s", lastFileNum, err)
return nil, err
}
if numBlocksInFile == 0 && lastFileNum > 0 {
secondLastFileNum := lastFileNum - 1
fileInfo := getFileInfoOrPanic(rootDir, secondLastFileNum)
logger.Debugf("Second last Block file info: FileName=[%s], FileSize=[%d]", fileInfo.Name(), fileInfo.Size())
if lastBlockBytes, _, _, err = scanForLastCompleteBlock(rootDir, secondLastFileNum, 0); err != nil {
logger.Errorf("Error scanning second last file [num=%d]: %s", secondLastFileNum, err)
return nil, err
}
}
if lastBlockBytes != nil {
if lastBlock, err = deserializeBlock(lastBlockBytes); err != nil {
logger.Errorf("Error deserializing last block: %s. Block bytes length: %d", err, len(lastBlockBytes))
return nil, err
}
lastBlockNumber = lastBlock.Header.Number
}
cpInfo := &checkpointInfo{
lastBlockNumber: lastBlockNumber,
latestFileChunksize: int(endOffsetLastBlock),
latestFileChunkSuffixNum: lastFileNum,
isChainEmpty: lastFileNum == 0 && numBlocksInFile == 0,
}
logger.Debugf("Checkpoint info constructed from file system = %s", spew.Sdump(cpInfo))
return cpInfo, nil
}
// binarySearchFileNumForBlock locates the file number that contains the given block number.
// This function assumes that the caller invokes this function with a block number that has been commited
// For any uncommitted block, this function returns the last file present
func binarySearchFileNumForBlock(rootDir string, blockNum uint64) (int, error) {
cpInfo, err := constructCheckpointInfoFromBlockFiles(rootDir)
if err != nil {
return -1, err
}
beginFile := 0
endFile := cpInfo.latestFileChunkSuffixNum
for endFile != beginFile {
searchFile := beginFile + (endFile-beginFile)/2 + 1
n, err := retriveFirstBlockNumFromFile(rootDir, searchFile)
if err != nil {
return -1, err
}
switch {
case n == blockNum:
return searchFile, nil
case n > blockNum:
endFile = searchFile - 1
case n < blockNum:
beginFile = searchFile
}
}
return beginFile, nil
}
func retriveFirstBlockNumFromFile(rootDir string, fileNum int) (uint64, error) {
s, err := newBlockfileStream(rootDir, fileNum, 0)
if err != nil {
return 0, err
}
defer s.close()
bb, err := s.nextBlockBytes()
if err != nil {
return 0, err
}
blockInfo, err := extractSerializedBlockInfo(bb)
if err != nil {
return 0, err
}
return blockInfo.blockHeader.Number, nil
}
func retrieveLastFileSuffix(rootDir string) (int, error) {
logger.Debugf("retrieveLastFileSuffix()")
biggestFileNum := -1
filesInfo, err := ioutil.ReadDir(rootDir)
if err != nil {
return -1, errors.Wrapf(err, "error reading dir %s", rootDir)
}
for _, fileInfo := range filesInfo {
name := fileInfo.Name()
if fileInfo.IsDir() || !isBlockFileName(name) {
logger.Debugf("Skipping File name = %s", name)
continue
}
fileSuffix := strings.TrimPrefix(name, blockfilePrefix)
fileNum, err := strconv.Atoi(fileSuffix)
if err != nil {
return -1, err
}
if fileNum > biggestFileNum {
biggestFileNum = fileNum
}
}
logger.Debugf("retrieveLastFileSuffix() - biggestFileNum = %d", biggestFileNum)
return biggestFileNum, err
}
func isBlockFileName(name string) bool {
return strings.HasPrefix(name, blockfilePrefix)
}
func getFileInfoOrPanic(rootDir string, fileNum int) os.FileInfo {
filePath := deriveBlockfilePath(rootDir, fileNum)
fileInfo, err := os.Lstat(filePath)
if err != nil {
panic(errors.Wrapf(err, "error retrieving file info for file number %d", fileNum))
}
return fileInfo
}