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les, light: implement ODR transaction lookup by hash (#19069)

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* les, light: implement ODR transaction lookup by hash

* les: delete useless file

* internal/ethapi: always use backend to find transaction

* les, eth, internal/ethapi: renamed GetCanonicalTransaction to GetTransaction

* light: add canonical header verification to GetTransaction
pull/19563/head
Felföldi Zsolt 6 years ago committed by Péter Szilágyi
parent f4fb1a1801
commit 40cdcf8c47
16 changed files with 182 additions and 51 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 6
      eth/api_backend.go
  2. 23
      internal/ethapi/api.go
  3. 1
      internal/ethapi/backend.go
  4. 4
      les/api_backend.go
  5. 3
      les/backend.go
  6. 17
      les/handler.go
  7. 26
      les/handler_test.go
  8. 4
      les/helper_test.go
  9. 1
      les/odr.go
  10. 40
      les/odr_requests.go
  11. 37
      les/odr_test.go
  12. 2
      les/peer.go
  13. 8
      les/protocol.go
  14. 15
      les/txrelay.go
  15. 17
      light/odr.go
  16. 21
      light/odr_util.go

6
eth/api_backend.go
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@ -26,6 +26,7 @@ import (
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/bloombits"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
@ -178,6 +179,11 @@ func (b *EthAPIBackend) GetPoolTransaction(hash common.Hash) *types.Transaction
return b.eth.txPool.Get(hash)
}
func (b *EthAPIBackend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
tx, blockHash, blockNumber, index := rawdb.ReadTransaction(b.eth.ChainDb(), txHash)
return tx, blockHash, blockNumber, index, nil
}
func (b *EthAPIBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
return b.eth.txPool.State().GetNonce(addr), nil
}

23
internal/ethapi/api.go
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@ -1155,25 +1155,32 @@ func (s *PublicTransactionPoolAPI) GetTransactionCount(ctx context.Context, addr
}
// GetTransactionByHash returns the transaction for the given hash
func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, hash common.Hash) *RPCTransaction {
func (s *PublicTransactionPoolAPI) GetTransactionByHash(ctx context.Context, hash common.Hash) (*RPCTransaction, error) {
// Try to return an already finalized transaction
if tx, blockHash, blockNumber, index := rawdb.ReadTransaction(s.b.ChainDb(), hash); tx != nil {
return newRPCTransaction(tx, blockHash, blockNumber, index)
tx, blockHash, blockNumber, index, err := s.b.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
if tx != nil {
return newRPCTransaction(tx, blockHash, blockNumber, index), nil
}
// No finalized transaction, try to retrieve it from the pool
if tx := s.b.GetPoolTransaction(hash); tx != nil {
return newRPCPendingTransaction(tx)
return newRPCPendingTransaction(tx), nil
}
// Transaction unknown, return as such
return nil
return nil, nil
}
// GetRawTransactionByHash returns the bytes of the transaction for the given hash.
func (s *PublicTransactionPoolAPI) GetRawTransactionByHash(ctx context.Context, hash common.Hash) (hexutil.Bytes, error) {
var tx *types.Transaction
// Retrieve a finalized transaction, or a pooled otherwise
if tx, _, _, _ = rawdb.ReadTransaction(s.b.ChainDb(), hash); tx == nil {
tx, _, _, _, err := s.b.GetTransaction(ctx, hash)
if err != nil {
return nil, err
}
if tx == nil {
if tx = s.b.GetPoolTransaction(hash); tx == nil {
// Transaction not found anywhere, abort
return nil, nil

1
internal/ethapi/backend.go
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@ -62,6 +62,7 @@ type Backend interface {
// TxPool API
SendTx(ctx context.Context, signedTx *types.Transaction) error
GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error)
GetPoolTransactions() (types.Transactions, error)
GetPoolTransaction(txHash common.Hash) *types.Transaction
GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error)

4
les/api_backend.go
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@ -132,6 +132,10 @@ func (b *LesApiBackend) GetPoolTransaction(txHash common.Hash) *types.Transactio
return b.eth.txPool.GetTransaction(txHash)
}
func (b *LesApiBackend) GetTransaction(ctx context.Context, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
return light.GetTransaction(ctx, b.eth.odr, txHash)
}
func (b *LesApiBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
return b.eth.txPool.GetNonce(ctx, addr)
}

3
les/backend.go
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@ -114,9 +114,9 @@ func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
if leth.config.ULC != nil {
trustedNodes = leth.config.ULC.TrustedServers
}
leth.relay = NewLesTxRelay(peers, leth.reqDist)
leth.serverPool = newServerPool(chainDb, quitSync, &leth.wg, trustedNodes)
leth.retriever = newRetrieveManager(peers, leth.reqDist, leth.serverPool)
leth.relay = NewLesTxRelay(peers, leth.retriever)
leth.odr = NewLesOdr(chainDb, light.DefaultClientIndexerConfig, leth.retriever)
leth.chtIndexer = light.NewChtIndexer(chainDb, leth.odr, params.CHTFrequency, params.HelperTrieConfirmations)
@ -271,6 +271,7 @@ func (s *LightEthereum) Start(srvr *p2p.Server) error {
// Ethereum protocol.
func (s *LightEthereum) Stop() error {
s.odr.Stop()
s.relay.Stop()
s.bloomIndexer.Close()
s.chtIndexer.Close()
s.blockchain.Stop()

17
les/handler.go
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@ -979,7 +979,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
return errResp(ErrRequestRejected, "")
}
go func() {
stats := make([]txStatus, len(req.Txs))
stats := make([]light.TxStatus, len(req.Txs))
for i, tx := range req.Txs {
if i != 0 && !task.waitOrStop() {
return
@ -1014,7 +1014,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
return errResp(ErrRequestRejected, "")
}
go func() {
stats := make([]txStatus, len(req.Hashes))
stats := make([]light.TxStatus, len(req.Hashes))
for i, hash := range req.Hashes {
if i != 0 && !task.waitOrStop() {
return
@ -1032,7 +1032,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
p.Log().Trace("Received tx status response")
var resp struct {
ReqID, BV uint64
Status []txStatus
Status []light.TxStatus
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
@ -1040,6 +1040,13 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
p.fcServer.ReceivedReply(resp.ReqID, resp.BV)
p.Log().Trace("Received helper trie proof response")
deliverMsg = &Msg{
MsgType: MsgTxStatus,
ReqID: resp.ReqID,
Obj: resp.Status,
}
default:
p.Log().Trace("Received unknown message", "code", msg.Code)
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
@ -1097,8 +1104,8 @@ func (pm *ProtocolManager) getHelperTrieAuxData(req HelperTrieReq) []byte {
return nil
}
func (pm *ProtocolManager) txStatus(hash common.Hash) txStatus {
var stat txStatus
func (pm *ProtocolManager) txStatus(hash common.Hash) light.TxStatus {
var stat light.TxStatus
stat.Status = pm.txpool.Status([]common.Hash{hash})[0]
// If the transaction is unknown to the pool, try looking it up locally
if stat.Status == core.TxStatusUnknown {

26
les/handler_test.go
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@ -443,7 +443,7 @@ func TestTransactionStatusLes2(t *testing.T) {
var reqID uint64
test := func(tx *types.Transaction, send bool, expStatus txStatus) {
test := func(tx *types.Transaction, send bool, expStatus light.TxStatus) {
reqID++
if send {
cost := peer.GetRequestCost(SendTxV2Msg, 1)
@ -452,7 +452,7 @@ func TestTransactionStatusLes2(t *testing.T) {
cost := peer.GetRequestCost(GetTxStatusMsg, 1)
sendRequest(peer.app, GetTxStatusMsg, reqID, cost, []common.Hash{tx.Hash()})
}
if err := expectResponse(peer.app, TxStatusMsg, reqID, testBufLimit, []txStatus{expStatus}); err != nil {
if err := expectResponse(peer.app, TxStatusMsg, reqID, testBufLimit, []light.TxStatus{expStatus}); err != nil {
t.Errorf("transaction status mismatch")
}
}
@ -461,20 +461,20 @@ func TestTransactionStatusLes2(t *testing.T) {
// test error status by sending an underpriced transaction
tx0, _ := types.SignTx(types.NewTransaction(0, acc1Addr, big.NewInt(10000), params.TxGas, nil, nil), signer, testBankKey)
test(tx0, true, txStatus{Status: core.TxStatusUnknown, Error: core.ErrUnderpriced.Error()})
test(tx0, true, light.TxStatus{Status: core.TxStatusUnknown, Error: core.ErrUnderpriced.Error()})
tx1, _ := types.SignTx(types.NewTransaction(0, acc1Addr, big.NewInt(10000), params.TxGas, big.NewInt(100000000000), nil), signer, testBankKey)
test(tx1, false, txStatus{Status: core.TxStatusUnknown}) // query before sending, should be unknown
test(tx1, true, txStatus{Status: core.TxStatusPending}) // send valid processable tx, should return pending
test(tx1, true, txStatus{Status: core.TxStatusPending}) // adding it again should not return an error
test(tx1, false, light.TxStatus{Status: core.TxStatusUnknown}) // query before sending, should be unknown
test(tx1, true, light.TxStatus{Status: core.TxStatusPending}) // send valid processable tx, should return pending
test(tx1, true, light.TxStatus{Status: core.TxStatusPending}) // adding it again should not return an error
tx2, _ := types.SignTx(types.NewTransaction(1, acc1Addr, big.NewInt(10000), params.TxGas, big.NewInt(100000000000), nil), signer, testBankKey)
tx3, _ := types.SignTx(types.NewTransaction(2, acc1Addr, big.NewInt(10000), params.TxGas, big.NewInt(100000000000), nil), signer, testBankKey)
// send transactions in the wrong order, tx3 should be queued
test(tx3, true, txStatus{Status: core.TxStatusQueued})
test(tx2, true, txStatus{Status: core.TxStatusPending})
test(tx3, true, light.TxStatus{Status: core.TxStatusQueued})
test(tx2, true, light.TxStatus{Status: core.TxStatusPending})
// query again, now tx3 should be pending too
test(tx3, false, txStatus{Status: core.TxStatusPending})
test(tx3, false, light.TxStatus{Status: core.TxStatusPending})
// generate and add a block with tx1 and tx2 included
gchain, _ := core.GenerateChain(params.TestChainConfig, chain.GetBlockByNumber(0), ethash.NewFaker(), db, 1, func(i int, block *core.BlockGen) {
@ -497,8 +497,8 @@ func TestTransactionStatusLes2(t *testing.T) {
// check if their status is included now
block1hash := rawdb.ReadCanonicalHash(db, 1)
test(tx1, false, txStatus{Status: core.TxStatusIncluded, Lookup: &rawdb.LegacyTxLookupEntry{BlockHash: block1hash, BlockIndex: 1, Index: 0}})
test(tx2, false, txStatus{Status: core.TxStatusIncluded, Lookup: &rawdb.LegacyTxLookupEntry{BlockHash: block1hash, BlockIndex: 1, Index: 1}})
test(tx1, false, light.TxStatus{Status: core.TxStatusIncluded, Lookup: &rawdb.LegacyTxLookupEntry{BlockHash: block1hash, BlockIndex: 1, Index: 0}})
test(tx2, false, light.TxStatus{Status: core.TxStatusIncluded, Lookup: &rawdb.LegacyTxLookupEntry{BlockHash: block1hash, BlockIndex: 1, Index: 1}})
// create a reorg that rolls them back
gchain, _ = core.GenerateChain(params.TestChainConfig, chain.GetBlockByNumber(0), ethash.NewFaker(), db, 2, func(i int, block *core.BlockGen) {})
@ -516,6 +516,6 @@ func TestTransactionStatusLes2(t *testing.T) {
t.Fatalf("pending count mismatch: have %d, want 3", pending)
}
// check if their status is pending again
test(tx1, false, txStatus{Status: core.TxStatusPending})
test(tx2, false, txStatus{Status: core.TxStatusPending})
test(tx1, false, light.TxStatus{Status: core.TxStatusPending})
test(tx2, false, light.TxStatus{Status: core.TxStatusPending})
}

4
les/helper_test.go
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@ -148,6 +148,7 @@ func newTestProtocolManager(lightSync bool, blocks int, generator func(int, *cor
}
genesis = gspec.MustCommit(db)
chain BlockChain
pool txPool
)
if peers == nil {
peers = newPeerSet()
@ -162,13 +163,14 @@ func newTestProtocolManager(lightSync bool, blocks int, generator func(int, *cor
panic(err)
}
chain = blockchain
pool = core.NewTxPool(core.DefaultTxPoolConfig, gspec.Config, blockchain)
}
indexConfig := light.TestServerIndexerConfig
if lightSync {
indexConfig = light.TestClientIndexerConfig
}
pm, err := NewProtocolManager(gspec.Config, indexConfig, lightSync, NetworkId, evmux, engine, peers, chain, nil, db, odr, nil, nil, make(chan struct{}), new(sync.WaitGroup), ulcConfig)
pm, err := NewProtocolManager(gspec.Config, indexConfig, lightSync, NetworkId, evmux, engine, peers, chain, pool, db, odr, nil, nil, make(chan struct{}), new(sync.WaitGroup), ulcConfig)
if err != nil {
return nil, err
}

1
les/odr.go
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@ -86,6 +86,7 @@ const (
MsgReceipts
MsgProofsV2
MsgHelperTrieProofs
MsgTxStatus
)
// Msg encodes a LES message that delivers reply data for a request

40
les/odr_requests.go
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@ -66,6 +66,8 @@ func LesRequest(req light.OdrRequest) LesOdrRequest {
return (*ChtRequest)(r)
case *light.BloomRequest:
return (*BloomRequest)(r)
case *light.TxStatusRequest:
return (*TxStatusRequest)(r)
default:
return nil
}
@ -471,6 +473,44 @@ func (r *BloomRequest) Validate(db ethdb.Database, msg *Msg) error {
return nil
}
// TxStatusRequest is the ODR request type for transaction status
type TxStatusRequest light.TxStatusRequest
// GetCost returns the cost of the given ODR request according to the serving
// peer's cost table (implementation of LesOdrRequest)
func (r *TxStatusRequest) GetCost(peer *peer) uint64 {
return peer.GetRequestCost(GetTxStatusMsg, len(r.Hashes))
}
// CanSend tells if a certain peer is suitable for serving the given request
func (r *TxStatusRequest) CanSend(peer *peer) bool {
return peer.version >= lpv2
}
// Request sends an ODR request to the LES network (implementation of LesOdrRequest)
func (r *TxStatusRequest) Request(reqID uint64, peer *peer) error {
peer.Log().Debug("Requesting transaction status", "count", len(r.Hashes))
return peer.RequestTxStatus(reqID, r.GetCost(peer), r.Hashes)
}
// Valid processes an ODR request reply message from the LES network
// returns true and stores results in memory if the message was a valid reply
// to the request (implementation of LesOdrRequest)
func (r *TxStatusRequest) Validate(db ethdb.Database, msg *Msg) error {
log.Debug("Validating transaction status", "count", len(r.Hashes))
// Ensure we have a correct message with a single block body
if msg.MsgType != MsgTxStatus {
return errInvalidMessageType
}
status := msg.Obj.([]light.TxStatus)
if len(status) != len(r.Hashes) {
return errInvalidEntryCount
}
r.Status = status
return nil
}
// readTraceDB stores the keys of database reads. We use this to check that received node
// sets contain only the trie nodes necessary to make proofs pass.
type readTraceDB struct {

37
les/odr_test.go
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@ -38,7 +38,7 @@ import (
type odrTestFn func(ctx context.Context, db ethdb.Database, config *params.ChainConfig, bc *core.BlockChain, lc *light.LightChain, bhash common.Hash) []byte
func TestOdrGetBlockLes2(t *testing.T) { testOdr(t, 2, 1, odrGetBlock) }
func TestOdrGetBlockLes2(t *testing.T) { testOdr(t, 2, 1, true, odrGetBlock) }
func odrGetBlock(ctx context.Context, db ethdb.Database, config *params.ChainConfig, bc *core.BlockChain, lc *light.LightChain, bhash common.Hash) []byte {
var block *types.Block
@ -54,7 +54,7 @@ func odrGetBlock(ctx context.Context, db ethdb.Database, config *params.ChainCon
return rlp
}
func TestOdrGetReceiptsLes2(t *testing.T) { testOdr(t, 2, 1, odrGetReceipts) }
func TestOdrGetReceiptsLes2(t *testing.T) { testOdr(t, 2, 1, true, odrGetReceipts) }
func odrGetReceipts(ctx context.Context, db ethdb.Database, config *params.ChainConfig, bc *core.BlockChain, lc *light.LightChain, bhash common.Hash) []byte {
var receipts types.Receipts
@ -74,7 +74,7 @@ func odrGetReceipts(ctx context.Context, db ethdb.Database, config *params.Chain
return rlp
}
func TestOdrAccountsLes2(t *testing.T) { testOdr(t, 2, 1, odrAccounts) }
func TestOdrAccountsLes2(t *testing.T) { testOdr(t, 2, 1, true, odrAccounts) }
func odrAccounts(ctx context.Context, db ethdb.Database, config *params.ChainConfig, bc *core.BlockChain, lc *light.LightChain, bhash common.Hash) []byte {
dummyAddr := common.HexToAddress("1234567812345678123456781234567812345678")
@ -102,7 +102,7 @@ func odrAccounts(ctx context.Context, db ethdb.Database, config *params.ChainCon
return res
}
func TestOdrContractCallLes2(t *testing.T) { testOdr(t, 2, 2, odrContractCall) }
func TestOdrContractCallLes2(t *testing.T) { testOdr(t, 2, 2, true, odrContractCall) }
type callmsg struct {
types.Message
@ -151,8 +151,32 @@ func odrContractCall(ctx context.Context, db ethdb.Database, config *params.Chai
return res
}
func TestOdrTxStatusLes2(t *testing.T) { testOdr(t, 2, 1, false, odrTxStatus) }
func odrTxStatus(ctx context.Context, db ethdb.Database, config *params.ChainConfig, bc *core.BlockChain, lc *light.LightChain, bhash common.Hash) []byte {
var txs types.Transactions
if bc != nil {
block := bc.GetBlockByHash(bhash)
txs = block.Transactions()
} else {
if block, _ := lc.GetBlockByHash(ctx, bhash); block != nil {
btxs := block.Transactions()
txs = make(types.Transactions, len(btxs))
for i, tx := range btxs {
var err error
txs[i], _, _, _, err = light.GetTransaction(ctx, lc.Odr(), tx.Hash())
if err != nil {
return nil
}
}
}
}
rlp, _ := rlp.EncodeToBytes(txs)
return rlp
}
// testOdr tests odr requests whose validation guaranteed by block headers.
func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
func testOdr(t *testing.T, protocol int, expFail uint64, checkCached bool, fn odrTestFn) {
// Assemble the test environment
server, client, tearDown := newClientServerEnv(t, 4, protocol, nil, true)
defer tearDown()
@ -193,9 +217,10 @@ func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
client.rPeer.hasBlock = func(common.Hash, uint64, bool) bool { return true }
client.peers.lock.Unlock()
test(5)
if checkCached {
// still expect all retrievals to pass, now data should be cached locally
client.peers.Unregister(client.rPeer.id)
time.Sleep(time.Millisecond * 10) // ensure that all peerSetNotify callbacks are executed
test(5)
}
}

2
les/peer.go
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@ -317,7 +317,7 @@ func (p *peer) ReplyHelperTrieProofs(reqID uint64, resp HelperTrieResps) *reply
}
// ReplyTxStatus creates a reply with a batch of transaction status records, corresponding to the ones requested.
func (p *peer) ReplyTxStatus(reqID uint64, stats []txStatus) *reply {
func (p *peer) ReplyTxStatus(reqID uint64, stats []light.TxStatus) *reply {
data, _ := rlp.EncodeToBytes(stats)
return &reply{p.rw, TxStatusMsg, reqID, data}
}

8
les/protocol.go
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@ -24,8 +24,6 @@ import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/rlp"
@ -227,9 +225,3 @@ type CodeData []struct {
}
type proofsData [][]rlp.RawValue
type txStatus struct {
Status core.TxStatus
Lookup *rawdb.LegacyTxLookupEntry `rlp:"nil"`
Error string
}

15
les/txrelay.go
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@ -17,6 +17,7 @@
package les
import (
"context"
"sync"
"github.com/ethereum/go-ethereum/common"
@ -36,21 +37,27 @@ type LesTxRelay struct {
peerList []*peer
peerStartPos int
lock sync.RWMutex
stop chan struct{}
reqDist *requestDistributor
retriever *retrieveManager
}
func NewLesTxRelay(ps *peerSet, reqDist *requestDistributor) *LesTxRelay {
func NewLesTxRelay(ps *peerSet, retriever *retrieveManager) *LesTxRelay {
r := &LesTxRelay{
txSent: make(map[common.Hash]*ltrInfo),
txPending: make(map[common.Hash]struct{}),
ps: ps,
reqDist: reqDist,
retriever: retriever,
stop: make(chan struct{}),
}
ps.notify(r)
return r
}
func (self *LesTxRelay) Stop() {
close(self.stop)
}
func (self *LesTxRelay) registerPeer(p *peer) {
self.lock.Lock()
defer self.lock.Unlock()
@ -132,7 +139,7 @@ func (self *LesTxRelay) send(txs types.Transactions, count int) {
return func() { peer.SendTxs(reqID, cost, enc) }
},
}
self.reqDist.queue(rq)
go self.retriever.retrieve(context.Background(), reqID, rq, func(p distPeer, msg *Msg) error { return nil }, self.stop)
}
}

17
light/odr.go
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@ -175,3 +175,20 @@ func (req *BloomRequest) StoreResult(db ethdb.Database) {
rawdb.WriteBloomBits(db, req.BitIdx, sectionIdx, sectionHead, req.BloomBits[i])
}
}
// TxStatus describes the status of a transaction
type TxStatus struct {
Status core.TxStatus
Lookup *rawdb.LegacyTxLookupEntry `rlp:"nil"`
Error string
}
// TxStatusRequest is the ODR request type for retrieving transaction status
type TxStatusRequest struct {
OdrRequest
Hashes []common.Hash
Status []TxStatus
}
// StoreResult stores the retrieved data in local database
func (req *TxStatusRequest) StoreResult(db ethdb.Database) {}

21
light/odr_util.go
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@ -21,6 +21,7 @@ import (
"context"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
@ -227,3 +228,23 @@ func GetBloomBits(ctx context.Context, odr OdrBackend, bitIdx uint, sectionIdxLi
return result, nil
}
}
// GetTransaction retrieves a canonical transaction by hash and also returns its position in the chain
func GetTransaction(ctx context.Context, odr OdrBackend, txHash common.Hash) (*types.Transaction, common.Hash, uint64, uint64, error) {
r := &TxStatusRequest{Hashes: []common.Hash{txHash}}
if err := odr.Retrieve(ctx, r); err != nil || r.Status[0].Status != core.TxStatusIncluded {
return nil, common.Hash{}, 0, 0, err
} else {
pos := r.Status[0].Lookup
// first ensure that we have the header, otherwise block body retrieval will fail
// also verify if this is a canonical block by getting the header by number and checking its hash
if header, err := GetHeaderByNumber(ctx, odr, pos.BlockIndex); err != nil || header.Hash() != pos.BlockHash {
return nil, common.Hash{}, 0, 0, err
}
if body, err := GetBody(ctx, odr, pos.BlockHash, pos.BlockIndex); err != nil || uint64(len(body.Transactions)) <= pos.Index || body.Transactions[pos.Index].Hash() != txHash {
return nil, common.Hash{}, 0, 0, err
} else {
return body.Transactions[pos.Index], pos.BlockHash, pos.BlockIndex, pos.Index, nil
}
}
}

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