eth/fetcher: don't spend too much time on transaction inclusion (#25524)

* eth/fetcher: introduce some lag in tx fetching

* eth/fetcher: change conditions a bit

* eth/fetcher: use per-batch quota check

* eth/fetcher: fix some comments

* eth/fetcher: address review concerns

* eth/fetcher: fix panic + add warn log

* eth/fetcher: fix log

* eth/fetcher: fix log

* cmd/devp2p/internal/ethtest: fix ignorign tx announcements from prev. tests

* cmd/devp2p/internal/ethtest: fix TestLargeTxRequest

This increases the number of tx relay messages the test waits for. Since
go-ethereum now processes incoming txs in smaller batches, the
announcement messages it sends are also smaller.

Co-authored-by: Felix Lange <fjl@twurst.com>

cmd/devp2p/internal/ethtest/helpers.go

@@ -357,9 +357,13 @@ func (s *Suite) waitAnnounce(conn *Conn, blockAnnouncement *NewBlock) error {
 				return fmt.Errorf("wrong block hash in announcement: expected %v, got %v", blockAnnouncement.Block.Hash(), hashes[0].Hash)
 			}
 			return nil
+
+		// ignore tx announcements from previous tests
 		case *NewPooledTransactionHashes:
-			// ignore tx announcements from previous tests
 			continue
+		case *Transactions:
+			continue
+
 		default:
 			return fmt.Errorf("unexpected: %s", pretty.Sdump(msg))
 		}

cmd/devp2p/internal/ethtest/suite.go

@@ -544,9 +544,13 @@ func (s *Suite) TestNewPooledTxs(t *utesting.T) {
 				t.Fatalf("unexpected number of txs requested: wanted %d, got %d", len(hashes), len(msg.GetPooledTransactionsPacket))
 			}
 			return
+
 		// ignore propagated txs from previous tests
 		case *NewPooledTransactionHashes:
 			continue
+		case *Transactions:
+			continue
+
 		// ignore block announcements from previous tests
 		case *NewBlockHashes:
 			continue

cmd/devp2p/internal/ethtest/transaction.go

@@ -29,7 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/params"
 )
 
-//var faucetAddr = common.HexToAddress("0x71562b71999873DB5b286dF957af199Ec94617F7")
+// var faucetAddr = common.HexToAddress("0x71562b71999873DB5b286dF957af199Ec94617F7")
 var faucetKey, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
 
 func (s *Suite) sendSuccessfulTxs(t *utesting.T) error {
@@ -192,10 +192,10 @@ func sendMultipleSuccessfulTxs(t *utesting.T, s *Suite, txs []*types.Transaction
 	nonce = txs[len(txs)-1].Nonce()
 
 	// Wait for the transaction announcement(s) and make sure all sent txs are being propagated.
-	// all txs should be announced within 3 announcements.
+	// all txs should be announced within a couple announcements.
 	recvHashes := make([]common.Hash, 0)
 
-	for i := 0; i < 3; i++ {
+	for i := 0; i < 20; i++ {
 		switch msg := recvConn.readAndServe(s.chain, timeout).(type) {
 		case *Transactions:
 			for _, tx := range *msg {