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eth/filters, ethclient/gethclient: add fullTx option to pending tx filter (#25186)

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This PR adds a way to subscribe to the _full_ pending transactions, as opposed to just being notified about hashes. 

In use cases where client subscribes to newPendingTransactions and gets txhashes only to then request the actual transaction, the caller can now shortcut that flow and obtain the transactions directly. 


Co-authored-by: Felix Lange <fjl@twurst.com>
pull/25975/head
lmittmann 2 years ago committed by GitHub
parent 010f47f76a
commit 5b1a04b9c7
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 91 additions and 43 deletions
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  1. 38
      eth/filters/api.go
  2. 28
      eth/filters/filter_system.go
  3. 22
      eth/filters/filter_system_test.go
  4. 7
      ethclient/gethclient/gethclient.go
  5. 39
      ethclient/gethclient/gethclient_test.go

38
eth/filters/api.go
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@ -38,6 +38,7 @@ type filter struct {
typ Type
deadline *time.Timer // filter is inactive when deadline triggers
hashes []common.Hash
txs []*types.Transaction
crit FilterCriteria
logs []*types.Log
s *Subscription // associated subscription in event system
@ -96,28 +97,28 @@ func (api *FilterAPI) timeoutLoop(timeout time.Duration) {
}
}
// NewPendingTransactionFilter creates a filter that fetches pending transaction hashes
// NewPendingTransactionFilter creates a filter that fetches pending transactions
// as transactions enter the pending state.
//
// It is part of the filter package because this filter can be used through the
// `eth_getFilterChanges` polling method that is also used for log filters.
func (api *FilterAPI) NewPendingTransactionFilter() rpc.ID {
var (
pendingTxs = make(chan []common.Hash)
pendingTxs = make(chan []*types.Transaction)
pendingTxSub = api.events.SubscribePendingTxs(pendingTxs)
)
api.filtersMu.Lock()
api.filters[pendingTxSub.ID] = &filter{typ: PendingTransactionsSubscription, deadline: time.NewTimer(api.timeout), hashes: make([]common.Hash, 0), s: pendingTxSub}
api.filters[pendingTxSub.ID] = &filter{typ: PendingTransactionsSubscription, deadline: time.NewTimer(api.timeout), txs: make([]*types.Transaction, 0), s: pendingTxSub}
api.filtersMu.Unlock()
go func() {
for {
select {
case ph := <-pendingTxs:
case pTx := <-pendingTxs:
api.filtersMu.Lock()
if f, found := api.filters[pendingTxSub.ID]; found {
f.hashes = append(f.hashes, ph...)
f.txs = append(f.txs, pTx...)
}
api.filtersMu.Unlock()
case <-pendingTxSub.Err():
@ -132,9 +133,10 @@ func (api *FilterAPI) NewPendingTransactionFilter() rpc.ID {
return pendingTxSub.ID
}
// NewPendingTransactions creates a subscription that is triggered each time a transaction
// enters the transaction pool and was signed from one of the transactions this nodes manages.
func (api *FilterAPI) NewPendingTransactions(ctx context.Context) (*rpc.Subscription, error) {
// NewPendingTransactions creates a subscription that is triggered each time a
// transaction enters the transaction pool. If fullTx is true the full tx is
// sent to the client, otherwise the hash is sent.
func (api *FilterAPI) NewPendingTransactions(ctx context.Context, fullTx *bool) (*rpc.Subscription, error) {
notifier, supported := rpc.NotifierFromContext(ctx)
if !supported {
return &rpc.Subscription{}, rpc.ErrNotificationsUnsupported
@ -143,16 +145,20 @@ func (api *FilterAPI) NewPendingTransactions(ctx context.Context) (*rpc.Subscrip
rpcSub := notifier.CreateSubscription()
go func() {
txHashes := make(chan []common.Hash, 128)
pendingTxSub := api.events.SubscribePendingTxs(txHashes)
txs := make(chan []*types.Transaction, 128)
pendingTxSub := api.events.SubscribePendingTxs(txs)
for {
select {
case hashes := <-txHashes:
case txs := <-txs:
// To keep the original behaviour, send a single tx hash in one notification.
// TODO(rjl493456442) Send a batch of tx hashes in one notification
for _, h := range hashes {
notifier.Notify(rpcSub.ID, h)
for _, tx := range txs {
if fullTx != nil && *fullTx {
notifier.Notify(rpcSub.ID, tx)
} else {
notifier.Notify(rpcSub.ID, tx.Hash())
}
}
case <-rpcSub.Err():
pendingTxSub.Unsubscribe()
@ -411,10 +417,14 @@ func (api *FilterAPI) GetFilterChanges(id rpc.ID) (interface{}, error) {
f.deadline.Reset(api.timeout)
switch f.typ {
case PendingTransactionsSubscription, BlocksSubscription:
case BlocksSubscription:
hashes := f.hashes
f.hashes = nil
return returnHashes(hashes), nil
case PendingTransactionsSubscription:
txs := f.txs
f.txs = nil
return txs, nil
case LogsSubscription, MinedAndPendingLogsSubscription:
logs := f.logs
f.logs = nil

28
eth/filters/filter_system.go
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@ -124,8 +124,8 @@ const (
PendingLogsSubscription
// MinedAndPendingLogsSubscription queries for logs in mined and pending blocks.
MinedAndPendingLogsSubscription
// PendingTransactionsSubscription queries tx hashes for pending
// transactions entering the pending state
// PendingTransactionsSubscription queries for pending transactions entering
// the pending state
PendingTransactionsSubscription
// BlocksSubscription queries hashes for blocks that are imported
BlocksSubscription
@ -151,7 +151,7 @@ type subscription struct {
created time.Time
logsCrit ethereum.FilterQuery
logs chan []*types.Log
hashes chan []common.Hash
txs chan []*types.Transaction
headers chan *types.Header
installed chan struct{} // closed when the filter is installed
err chan error // closed when the filter is uninstalled
@ -244,7 +244,7 @@ func (sub *Subscription) Unsubscribe() {
case sub.es.uninstall <- sub.f:
break uninstallLoop
case <-sub.f.logs:
case <-sub.f.hashes:
case <-sub.f.txs:
case <-sub.f.headers:
}
}
@ -311,7 +311,7 @@ func (es *EventSystem) subscribeMinedPendingLogs(crit ethereum.FilterQuery, logs
logsCrit: crit,
created: time.Now(),
logs: logs,
hashes: make(chan []common.Hash),
txs: make(chan []*types.Transaction),
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
@ -328,7 +328,7 @@ func (es *EventSystem) subscribeLogs(crit ethereum.FilterQuery, logs chan []*typ
logsCrit: crit,
created: time.Now(),
logs: logs,
hashes: make(chan []common.Hash),
txs: make(chan []*types.Transaction),
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
@ -345,7 +345,7 @@ func (es *EventSystem) subscribePendingLogs(crit ethereum.FilterQuery, logs chan
logsCrit: crit,
created: time.Now(),
logs: logs,
hashes: make(chan []common.Hash),
txs: make(chan []*types.Transaction),
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
@ -361,7 +361,7 @@ func (es *EventSystem) SubscribeNewHeads(headers chan *types.Header) *Subscripti
typ: BlocksSubscription,
created: time.Now(),
logs: make(chan []*types.Log),
hashes: make(chan []common.Hash),
txs: make(chan []*types.Transaction),
headers: headers,
installed: make(chan struct{}),
err: make(chan error),
@ -369,15 +369,15 @@ func (es *EventSystem) SubscribeNewHeads(headers chan *types.Header) *Subscripti
return es.subscribe(sub)
}
// SubscribePendingTxs creates a subscription that writes transaction hashes for
// SubscribePendingTxs creates a subscription that writes transactions for
// transactions that enter the transaction pool.
func (es *EventSystem) SubscribePendingTxs(hashes chan []common.Hash) *Subscription {
func (es *EventSystem) SubscribePendingTxs(txs chan []*types.Transaction) *Subscription {
sub := &subscription{
id: rpc.NewID(),
typ: PendingTransactionsSubscription,
created: time.Now(),
logs: make(chan []*types.Log),
hashes: hashes,
txs: txs,
headers: make(chan *types.Header),
installed: make(chan struct{}),
err: make(chan error),
@ -421,12 +421,8 @@ func (es *EventSystem) handleRemovedLogs(filters filterIndex, ev core.RemovedLog
}
func (es *EventSystem) handleTxsEvent(filters filterIndex, ev core.NewTxsEvent) {
hashes := make([]common.Hash, 0, len(ev.Txs))
for _, tx := range ev.Txs {
hashes = append(hashes, tx.Hash())
}
for _, f := range filters[PendingTransactionsSubscription] {
f.hashes <- hashes
f.txs <- ev.Txs
}
}

22
eth/filters/filter_system_test.go
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@ -240,7 +240,7 @@ func TestPendingTxFilter(t *testing.T) {
types.NewTransaction(4, common.HexToAddress("0xb794f5ea0ba39494ce83a213fffba74279579268"), new(big.Int), 0, new(big.Int), nil),
}
hashes []common.Hash
txs []*types.Transaction
)
fid0 := api.NewPendingTransactionFilter()
@ -255,9 +255,9 @@ func TestPendingTxFilter(t *testing.T) {
t.Fatalf("Unable to retrieve logs: %v", err)
}
h := results.([]common.Hash)
hashes = append(hashes, h...)
if len(hashes) >= len(transactions) {
tx := results.([]*types.Transaction)
txs = append(txs, tx...)
if len(txs) >= len(transactions) {
break
}
// check timeout
@ -268,13 +268,13 @@ func TestPendingTxFilter(t *testing.T) {
time.Sleep(100 * time.Millisecond)
}
if len(hashes) != len(transactions) {
t.Errorf("invalid number of transactions, want %d transactions(s), got %d", len(transactions), len(hashes))
if len(txs) != len(transactions) {
t.Errorf("invalid number of transactions, want %d transactions(s), got %d", len(transactions), len(txs))
return
}
for i := range hashes {
if hashes[i] != transactions[i].Hash() {
t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), hashes[i])
for i := range txs {
if txs[i].Hash() != transactions[i].Hash() {
t.Errorf("hashes[%d] invalid, want %x, got %x", i, transactions[i].Hash(), txs[i].Hash())
}
}
}
@ -705,11 +705,11 @@ func TestPendingTxFilterDeadlock(t *testing.T) {
fids[i] = fid
// Wait for at least one tx to arrive in filter
for {
hashes, err := api.GetFilterChanges(fid)
txs, err := api.GetFilterChanges(fid)
if err != nil {
t.Fatalf("Filter should exist: %v\n", err)
}
if len(hashes.([]common.Hash)) > 0 {
if len(txs.([]*types.Transaction)) > 0 {
break
}
runtime.Gosched()

7
ethclient/gethclient/gethclient.go
Unescape View File

@ -166,7 +166,12 @@ func (ec *Client) GetNodeInfo(ctx context.Context) (*p2p.NodeInfo, error) {
return &result, err
}
// SubscribePendingTransactions subscribes to new pending transactions.
// SubscribeFullPendingTransactions subscribes to new pending transactions.
func (ec *Client) SubscribeFullPendingTransactions(ctx context.Context, ch chan<- *types.Transaction) (*rpc.ClientSubscription, error) {
return ec.c.EthSubscribe(ctx, ch, "newPendingTransactions", true)
}
// SubscribePendingTransactions subscribes to new pending transaction hashes.
func (ec *Client) SubscribePendingTransactions(ctx context.Context, ch chan<- common.Hash) (*rpc.ClientSubscription, error) {
return ec.c.EthSubscribe(ctx, ch, "newPendingTransactions")
}

39
ethclient/gethclient/gethclient_test.go
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@ -122,8 +122,11 @@ func TestGethClient(t *testing.T) {
"TestSetHead",
func(t *testing.T) { testSetHead(t, client) },
}, {
"TestSubscribePendingTxs",
"TestSubscribePendingTxHashes",
func(t *testing.T) { testSubscribePendingTransactions(t, client) },
}, {
"TestSubscribePendingTxs",
func(t *testing.T) { testSubscribeFullPendingTransactions(t, client) },
}, {
"TestCallContract",
func(t *testing.T) { testCallContract(t, client) },
@ -303,6 +306,40 @@ func testSubscribePendingTransactions(t *testing.T, client *rpc.Client) {
}
}
func testSubscribeFullPendingTransactions(t *testing.T, client *rpc.Client) {
ec := New(client)
ethcl := ethclient.NewClient(client)
// Subscribe to Transactions
ch := make(chan *types.Transaction)
ec.SubscribeFullPendingTransactions(context.Background(), ch)
// Send a transaction
chainID, err := ethcl.ChainID(context.Background())
if err != nil {
t.Fatal(err)
}
// Create transaction
tx := types.NewTransaction(1, common.Address{1}, big.NewInt(1), 22000, big.NewInt(1), nil)
signer := types.LatestSignerForChainID(chainID)
signature, err := crypto.Sign(signer.Hash(tx).Bytes(), testKey)
if err != nil {
t.Fatal(err)
}
signedTx, err := tx.WithSignature(signer, signature)
if err != nil {
t.Fatal(err)
}
// Send transaction
err = ethcl.SendTransaction(context.Background(), signedTx)
if err != nil {
t.Fatal(err)
}
// Check that the transaction was send over the channel
tx = <-ch
if tx.Hash() != signedTx.Hash() {
t.Fatalf("Invalid tx hash received, got %v, want %v", tx.Hash(), signedTx.Hash())
}
}
func testCallContract(t *testing.T, client *rpc.Client) {
ec := New(client)
msg := ethereum.CallMsg{

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