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archive.go
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archive.go
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// Copyright 2016 Stellar Development Foundation and contributors. Licensed
// under the Apache License, Version 2.0. See the COPYING file at the root
// of this distribution or at http://www.apache.org/licenses/LICENSE-2.0
package historyarchive
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"log"
"net/url"
"path"
"regexp"
"strconv"
"strings"
"sync"
"github.com/stellar/go/support/errors"
"github.com/stellar/go/xdr"
)
const hexPrefixPat = "/[0-9a-f]{2}/[0-9a-f]{2}/[0-9a-f]{2}/"
const rootHASPath = ".well-known/stellar-history.json"
type CommandOptions struct {
Concurrency int
Range Range
DryRun bool
Force bool
Verify bool
Thorough bool
}
type ConnectOptions struct {
Context context.Context
// NetworkPassphrase defines the expected network of history archive. It is
// checked when getting HAS. If network passphrase does not match, error is
// returned.
NetworkPassphrase string
S3Region string
S3Endpoint string
UnsignedRequests bool
// CheckpointFrequency is the number of ledgers between checkpoints
// if unset, DefaultCheckpointFrequency will be used
CheckpointFrequency uint32
}
type Ledger struct {
Header xdr.LedgerHeaderHistoryEntry
Transaction xdr.TransactionHistoryEntry
TransactionResult xdr.TransactionHistoryResultEntry
}
type ArchiveBackend interface {
Exists(path string) (bool, error)
Size(path string) (int64, error)
GetFile(path string) (io.ReadCloser, error)
PutFile(path string, in io.ReadCloser) error
ListFiles(path string) (chan string, chan error)
CanListFiles() bool
}
type ArchiveInterface interface {
GetPathHAS(path string) (HistoryArchiveState, error)
PutPathHAS(path string, has HistoryArchiveState, opts *CommandOptions) error
BucketExists(bucket Hash) (bool, error)
CategoryCheckpointExists(cat string, chk uint32) (bool, error)
GetLedgerHeader(chk uint32) (xdr.LedgerHeaderHistoryEntry, error)
GetRootHAS() (HistoryArchiveState, error)
GetLedgers(start, end uint32) (map[uint32]*Ledger, error)
GetCheckpointHAS(chk uint32) (HistoryArchiveState, error)
PutCheckpointHAS(chk uint32, has HistoryArchiveState, opts *CommandOptions) error
PutRootHAS(has HistoryArchiveState, opts *CommandOptions) error
ListBucket(dp DirPrefix) (chan string, chan error)
ListAllBuckets() (chan string, chan error)
ListAllBucketHashes() (chan Hash, chan error)
ListCategoryCheckpoints(cat string, pth string) (chan uint32, chan error)
GetXdrStreamForHash(hash Hash) (*XdrStream, error)
GetXdrStream(pth string) (*XdrStream, error)
GetCheckpointManager() CheckpointManager
}
var _ ArchiveInterface = &Archive{}
type Archive struct {
networkPassphrase string
mutex sync.Mutex
checkpointFiles map[string](map[uint32]bool)
allBuckets map[Hash]bool
referencedBuckets map[Hash]bool
expectLedgerHashes map[uint32]Hash
actualLedgerHashes map[uint32]Hash
expectTxSetHashes map[uint32]Hash
actualTxSetHashes map[uint32]Hash
expectTxResultSetHashes map[uint32]Hash
actualTxResultSetHashes map[uint32]Hash
invalidBuckets int
invalidLedgers int
invalidTxSets int
invalidTxResultSets int
checkpointManager CheckpointManager
backend ArchiveBackend
}
func (arch *Archive) GetCheckpointManager() CheckpointManager {
return arch.checkpointManager
}
func (a *Archive) GetPathHAS(path string) (HistoryArchiveState, error) {
var has HistoryArchiveState
rdr, err := a.backend.GetFile(path)
if err != nil {
return has, err
}
defer rdr.Close()
dec := json.NewDecoder(rdr)
err = dec.Decode(&has)
if err != nil {
return has, err
}
// Compare network passphrase only when non empty. The field was added in
// Stellar-Core 14.1.0.
if has.NetworkPassphrase != "" && a.networkPassphrase != "" &&
has.NetworkPassphrase != a.networkPassphrase {
return has, errors.Errorf(
"Network passphrase does not match! expected=%s actual=%s",
a.networkPassphrase,
has.NetworkPassphrase,
)
}
return has, nil
}
func (a *Archive) PutPathHAS(path string, has HistoryArchiveState, opts *CommandOptions) error {
exists, err := a.backend.Exists(path)
if err != nil {
return err
}
if exists && !opts.Force {
log.Printf("skipping existing " + path)
return nil
}
buf, err := json.MarshalIndent(has, "", " ")
if err != nil {
return err
}
return a.backend.PutFile(path,
ioutil.NopCloser(bytes.NewReader(buf)))
}
func (a *Archive) BucketExists(bucket Hash) (bool, error) {
return a.backend.Exists(BucketPath(bucket))
}
func (a *Archive) CategoryCheckpointExists(cat string, chk uint32) (bool, error) {
return a.backend.Exists(CategoryCheckpointPath(cat, chk))
}
func (a *Archive) GetLedgerHeader(ledger uint32) (xdr.LedgerHeaderHistoryEntry, error) {
checkpoint := ledger
if !a.checkpointManager.IsCheckpoint(checkpoint) {
checkpoint = a.checkpointManager.NextCheckpoint(ledger)
}
path := CategoryCheckpointPath("ledger", checkpoint)
xdrStream, err := a.GetXdrStream(path)
if err != nil {
return xdr.LedgerHeaderHistoryEntry{}, errors.Wrap(err, "error opening ledger stream")
}
defer xdrStream.Close()
for {
var ledgerHeader xdr.LedgerHeaderHistoryEntry
err = xdrStream.ReadOne(&ledgerHeader)
if err != nil {
if err == io.EOF {
break
}
return ledgerHeader, errors.Wrap(err, "error reading from ledger stream")
}
if uint32(ledgerHeader.Header.LedgerSeq) == ledger {
return ledgerHeader, nil
}
}
return xdr.LedgerHeaderHistoryEntry{}, errors.New("ledger header not found in checkpoint")
}
func (a *Archive) GetRootHAS() (HistoryArchiveState, error) {
return a.GetPathHAS(rootHASPath)
}
func (a *Archive) GetLedgers(start, end uint32) (map[uint32]*Ledger, error) {
if start > end {
return nil, errors.Errorf("range is invalid, start: %d end: %d", start, end)
}
startCheckpoint := a.GetCheckpointManager().GetCheckpoint(start)
endCheckpoint := a.GetCheckpointManager().GetCheckpoint(end)
cache := map[uint32]*Ledger{}
for cur := startCheckpoint; cur <= endCheckpoint; cur += a.GetCheckpointManager().GetCheckpointFrequency() {
for _, category := range []string{"ledger", "transactions", "results"} {
if exists, err := a.CategoryCheckpointExists(category, cur); err != nil {
return nil, errors.Wrap(err, "could not check if category checkpoint exists")
} else if !exists {
return nil, errors.Errorf("checkpoint %d is not published", cur)
}
if err := a.fetchCategory(cache, category, cur); err != nil {
return nil, errors.Wrap(err, "could not fetch category checkpoint")
}
}
}
return cache, nil
}
func (a *Archive) fetchCategory(cache map[uint32]*Ledger, category string, checkpointSequence uint32) error {
checkpointPath := CategoryCheckpointPath(category, checkpointSequence)
xdrStream, err := a.GetXdrStream(checkpointPath)
if err != nil {
return errors.Wrapf(err, "error opening %s stream", category)
}
defer xdrStream.Close()
for {
switch category {
case "ledger":
var object xdr.LedgerHeaderHistoryEntry
if err = xdrStream.ReadOne(&object); err == nil {
entry := cache[uint32(object.Header.LedgerSeq)]
if entry == nil {
entry = &Ledger{}
}
entry.Header = object
cache[uint32(object.Header.LedgerSeq)] = entry
}
case "transactions":
var object xdr.TransactionHistoryEntry
if err = xdrStream.ReadOne(&object); err == nil {
entry := cache[uint32(object.LedgerSeq)]
if entry == nil {
entry = &Ledger{}
}
entry.Transaction = object
cache[uint32(object.LedgerSeq)] = entry
}
case "results":
var object xdr.TransactionHistoryResultEntry
if err = xdrStream.ReadOne(&object); err == nil {
entry := cache[uint32(object.LedgerSeq)]
if entry == nil {
entry = &Ledger{}
}
entry.TransactionResult = object
cache[uint32(object.LedgerSeq)] = entry
}
default:
panic("unknown category")
}
if err == io.EOF {
break
} else if err != nil {
return errors.Wrapf(err, "error reading from %s stream", category)
}
}
return nil
}
func (a *Archive) GetCheckpointHAS(chk uint32) (HistoryArchiveState, error) {
return a.GetPathHAS(CategoryCheckpointPath("history", chk))
}
func (a *Archive) PutCheckpointHAS(chk uint32, has HistoryArchiveState, opts *CommandOptions) error {
return a.PutPathHAS(CategoryCheckpointPath("history", chk), has, opts)
}
func (a *Archive) PutRootHAS(has HistoryArchiveState, opts *CommandOptions) error {
force := opts.Force
opts.Force = true
e := a.PutPathHAS(rootHASPath, has, opts)
opts.Force = force
return e
}
func (a *Archive) ListBucket(dp DirPrefix) (chan string, chan error) {
return a.backend.ListFiles(path.Join("bucket", dp.Path()))
}
func (a *Archive) ListAllBuckets() (chan string, chan error) {
return a.backend.ListFiles("bucket")
}
func (a *Archive) ListAllBucketHashes() (chan Hash, chan error) {
sch, errs := a.backend.ListFiles("bucket")
ch := make(chan Hash)
rx := regexp.MustCompile("bucket" + hexPrefixPat + "bucket-([0-9a-f]{64})\\.xdr\\.gz$")
errs = makeErrorPump(errs)
go func() {
for s := range sch {
m := rx.FindStringSubmatch(s)
if m != nil {
ch <- MustDecodeHash(m[1])
}
}
close(ch)
}()
return ch, errs
}
func (a *Archive) ListCategoryCheckpoints(cat string, pth string) (chan uint32, chan error) {
ext := categoryExt(cat)
rx := regexp.MustCompile(cat + hexPrefixPat + cat +
"-([0-9a-f]{8})\\." + regexp.QuoteMeta(ext) + "$")
sch, errs := a.backend.ListFiles(path.Join(cat, pth))
ch := make(chan uint32)
errs = makeErrorPump(errs)
go func() {
for s := range sch {
m := rx.FindStringSubmatch(s)
if m != nil {
i, e := strconv.ParseUint(m[1], 16, 32)
if e == nil {
ch <- uint32(i)
} else {
errs <- errors.New("decoding checkpoint number in filename " + s)
}
}
}
close(ch)
}()
return ch, errs
}
func (a *Archive) GetBucketPathForHash(hash Hash) string {
return fmt.Sprintf(
"bucket/%s/bucket-%s.xdr.gz",
HashPrefix(hash).Path(),
hash.String(),
)
}
func (a *Archive) GetXdrStreamForHash(hash Hash) (*XdrStream, error) {
return a.GetXdrStream(a.GetBucketPathForHash(hash))
}
func (a *Archive) GetXdrStream(pth string) (*XdrStream, error) {
if !strings.HasSuffix(pth, ".xdr.gz") {
return nil, errors.New("File has non-.xdr.gz suffix: " + pth)
}
rdr, err := a.backend.GetFile(pth)
if err != nil {
return nil, err
}
return NewXdrGzStream(rdr)
}
func Connect(u string, opts ConnectOptions) (*Archive, error) {
arch := Archive{
networkPassphrase: opts.NetworkPassphrase,
checkpointFiles: make(map[string](map[uint32]bool)),
allBuckets: make(map[Hash]bool),
referencedBuckets: make(map[Hash]bool),
expectLedgerHashes: make(map[uint32]Hash),
actualLedgerHashes: make(map[uint32]Hash),
expectTxSetHashes: make(map[uint32]Hash),
actualTxSetHashes: make(map[uint32]Hash),
expectTxResultSetHashes: make(map[uint32]Hash),
actualTxResultSetHashes: make(map[uint32]Hash),
checkpointManager: NewCheckpointManager(opts.CheckpointFrequency),
}
for _, cat := range Categories() {
arch.checkpointFiles[cat] = make(map[uint32]bool)
}
if u == "" {
return &arch, errors.New("URL is empty")
}
parsed, err := url.Parse(u)
if err != nil {
return &arch, err
}
if opts.Context == nil {
opts.Context = context.Background()
}
pth := parsed.Path
if parsed.Scheme == "s3" {
// Inside s3, all paths start _without_ the leading /
if len(pth) > 0 && pth[0] == '/' {
pth = pth[1:]
}
arch.backend, err = makeS3Backend(parsed.Host, pth, opts)
} else if parsed.Scheme == "file" {
pth = path.Join(parsed.Host, pth)
arch.backend = makeFsBackend(pth, opts)
} else if parsed.Scheme == "http" || parsed.Scheme == "https" {
arch.backend = makeHttpBackend(parsed, opts)
} else if parsed.Scheme == "mock" {
arch.backend = makeMockBackend(opts)
} else {
err = errors.New("unknown URL scheme: '" + parsed.Scheme + "'")
}
return &arch, err
}
func MustConnect(u string, opts ConnectOptions) *Archive {
arch, err := Connect(u, opts)
if err != nil {
log.Fatal(err)
}
return arch
}