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// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"archive/tar"
"compress/bzip2"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/algorand/go-algorand/logging"
"github.com/algorand/go-deadlock"
)
type tarBlockSet struct {
// known tarfiles
entries []*tarBlockFile
// tarfiles with an open handle
// a cache with random replacement
open []*tarBlockFile
// replacement index
nextOpen int
l deadlock.Mutex
}
const maxOpenTars = 3
func openTarBlockDir(path string) (tars *tarBlockSet, err error) {
out := &tarBlockSet{}
matches, err := filepath.Glob(filepath.Join(path, "*_*.tar.bz2"))
if err != nil {
return nil, err
}
out.entries = make([]*tarBlockFile, 0, len(matches))
for _, path := range matches {
tbf := parseTarPathname(path)
if tbf != nil {
out.entries = append(out.entries, tbf)
}
}
logging.Base().Infof("found %d block tarfiles", len(out.entries))
out.open = make([]*tarBlockFile, 0, maxOpenTars)
return out, nil
}
func (tars *tarBlockSet) getBlock(round uint64) (data []byte, err error) {
tars.l.Lock()
defer tars.l.Unlock()
for _, tbf := range tars.open {
if tbf.first <= round && round <= tbf.last {
return tbf.getBlock(round)
}
}
for _, tbf := range tars.entries {
if tbf.first <= round && round <= tbf.last {
if len(tars.open) >= maxOpenTars {
tars.open[tars.nextOpen].close()
tars.open[tars.nextOpen] = tbf
tars.nextOpen = (tars.nextOpen + 1) % len(tars.open)
} else {
tars.open = append(tars.open, tbf)
}
return tbf.getBlock(round)
}
}
return nil, nil
}
type tarBlockFile struct {
path string
first uint64
last uint64
// fields valid when tarfile is open
rawFile io.ReadCloser
bz2Stream io.Reader
tarfile *tar.Reader
current *tar.Header
currentRound uint64
l deadlock.Mutex
blocks map[uint64][]byte
}
func parseTarPathname(path string) (tbf *tarBlockFile) {
fname := filepath.Base(path)
underscore := strings.IndexRune(fname, '_')
if underscore < 0 {
return nil
}
dottar := strings.Index(fname, ".tar")
if dottar < 0 {
return nil
}
first, err := strconv.ParseUint(fname[:underscore], 10, 64)
if err != nil {
return nil
}
last, err := strconv.ParseUint(fname[underscore+1:dottar], 10, 64)
if err != nil {
return nil
}
return &tarBlockFile{
path: path,
first: first,
last: last,
}
}
func (tbf *tarBlockFile) _open() (err error) {
if tbf.tarfile != nil {
logging.Base().Infof("%s already open", tbf.path)
return nil
}
tbf.rawFile, err = os.Open(tbf.path)
if err != nil {
err = fmt.Errorf("%s: os.open %v", tbf.path, err)
tbf.rawFile = nil
return
}
logging.Base().Infof("open %p %s", tbf, tbf.path)
if strings.HasSuffix(tbf.path, ".bz2") {
tbf.bz2Stream = bzip2.NewReader(tbf.rawFile)
tbf.tarfile = tar.NewReader(tbf.bz2Stream)
} else {
tbf.tarfile = tar.NewReader(tbf.rawFile)
}
tbf.blocks = make(map[uint64][]byte, 1000)
return nil
}
func (tbf *tarBlockFile) close() (err error) {
tbf.l.Lock()
defer tbf.l.Unlock()
return tbf._close()
}
func (tbf *tarBlockFile) _close() (err error) {
if tbf.rawFile != nil {
err = tbf.rawFile.Close()
logging.Base().Infof("close %p %s, %v", tbf, tbf.path, err)
tbf.rawFile = nil
tbf.bz2Stream = nil
tbf.tarfile = nil
tbf.current = nil
tbf.blocks = nil
} else {
logging.Base().Infof("close %p %s", tbf, tbf.path)
}
return
}
func (tbf *tarBlockFile) getBlock(round uint64) (data []byte, err error) {
tbf.l.Lock()
defer tbf.l.Unlock()
if tbf.blocks != nil {
var ok bool
data, ok = tbf.blocks[round]
if ok {
return
}
}
//logging.Base().Infof("get block %d", round)
//defer logging.Base().Infof("get block %d done %v", round, err)
if tbf.tarfile == nil {
err = tbf._open()
if err != nil {
err = fmt.Errorf("%s: open, %v", tbf.path, err)
return
}
if tbf.tarfile == nil {
err = fmt.Errorf("%s: tarfile didn't open", tbf.path)
return
}
}
err = nil
for true {
tbf.current, err = tbf.tarfile.Next()
if err == io.EOF {
tbf._close()
// we don't have it
return nil, nil
}
if err != nil {
err = fmt.Errorf("%s: next, %v", tbf.path, err)
tbf._close()
return nil, err
}
tbf.currentRound, err = strconv.ParseUint(tbf.current.Name, 10, 64)
if err != nil {
err = fmt.Errorf("%s: could not parse block file name %#v, %v", tbf.path, tbf.current.Name, err)
return nil, err
}
data = make([]byte, tbf.current.Size)
_, err = io.ReadFull(tbf.tarfile, data)
if err != nil {
err = fmt.Errorf("%s: read %s, %v", tbf.path, tbf.current.Name, err)
}
tbf.blocks[tbf.currentRound] = data
if tbf.currentRound == round {
return
}
}
return nil, errors.New("this should be unreachable")
}
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