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eth/fetcher: remove alternates, announced maps #32773

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cc985aa
refactor: remove alternates map
healthykim Sep 29, 2025
1c81309
refactor: remove announced map
healthykim Sep 29, 2025
e1920bf
chore: uncomment test code
healthykim Sep 29, 2025
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107 changes: 21 additions & 86 deletions eth/fetcher/tx_fetcher.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,6 @@ package fetcher

import (
"errors"
"fmt"
"math"
mrand "math/rand"
"sort"
Expand Down Expand Up @@ -104,7 +103,6 @@ var (
txFetcherWaitingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/peers", nil)
txFetcherWaitingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/waiting/hashes", nil)
txFetcherQueueingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/peers", nil)
txFetcherQueueingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/queueing/hashes", nil)
txFetcherFetchingPeers = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/peers", nil)
txFetcherFetchingHashes = metrics.NewRegisteredGauge("eth/fetcher/transaction/fetching/hashes", nil)
)
Expand Down Expand Up @@ -187,17 +185,15 @@ type TxFetcher struct {
waittime map[common.Hash]mclock.AbsTime // Timestamps when transactions were added to the waitlist
waitslots map[string]map[common.Hash]*txMetadataWithSeq // Waiting announcements grouped by peer (DoS protection)

// Stage 2: Queue of transactions that waiting to be allocated to some peer
// to be retrieved directly.
// Stage 2: Transactions that are either waiting to be allocated
// to a peer or are already being fetched.
announces map[string]map[common.Hash]*txMetadataWithSeq // Set of announced transactions, grouped by origin peer
announced map[common.Hash]map[string]struct{} // Set of download locations, grouped by transaction hash

// Stage 3: Set of transactions currently being retrieved, some which may be
// fulfilled and some rescheduled. Note, this step shares 'announces' from the
// previous stage to avoid having to duplicate (need it for DoS checks).
fetching map[common.Hash]string // Transaction set currently being retrieved
requests map[string]*txRequest // In-flight transaction retrievals
alternates map[common.Hash]map[string]struct{} // In-flight transaction alternate origins if retrieval fails
fetching map[common.Hash]string // Transaction set currently being retrieved
requests map[string]*txRequest // In-flight transaction retrievals

// Callbacks
hasTx func(common.Hash) bool // Retrieves a tx from the local txpool
Expand Down Expand Up @@ -231,10 +227,8 @@ func NewTxFetcherForTests(
waittime: make(map[common.Hash]mclock.AbsTime),
waitslots: make(map[string]map[common.Hash]*txMetadataWithSeq),
announces: make(map[string]map[common.Hash]*txMetadataWithSeq),
announced: make(map[common.Hash]map[string]struct{}),
fetching: make(map[common.Hash]string),
requests: make(map[string]*txRequest),
alternates: make(map[common.Hash]map[string]struct{}),
underpriced: lru.NewCache[common.Hash, time.Time](maxTxUnderpricedSetSize),
hasTx: hasTx,
addTxs: addTxs,
Expand Down Expand Up @@ -457,33 +451,9 @@ func (f *TxFetcher) loop() {
}
)
for i, hash := range ann.hashes {
// If the transaction is already downloading, add it to the list
// of possible alternates (in case the current retrieval fails) and
// also account it for the peer.
if f.alternates[hash] != nil {
f.alternates[hash][ann.origin] = struct{}{}

// Stage 2 and 3 share the set of origins per tx
if announces := f.announces[ann.origin]; announces != nil {
announces[hash] = &txMetadataWithSeq{
txMetadata: ann.metas[i],
seq: nextSeq(),
}
} else {
f.announces[ann.origin] = map[common.Hash]*txMetadataWithSeq{
hash: {
txMetadata: ann.metas[i],
seq: nextSeq(),
},
}
}
continue
}
// If the transaction is not downloading, but is already queued
// from a different peer, track it for the new peer too.
if f.announced[hash] != nil {
f.announced[hash][ann.origin] = struct{}{}

// If the transaction is already downloading or queued from a different peer,
// track it for the new peer
if f.announced(hash) {
// Stage 2 and 3 share the set of origins per tx
if announces := f.announces[ann.origin]; announces != nil {
announces[hash] = &txMetadataWithSeq{
Expand Down Expand Up @@ -564,15 +534,14 @@ func (f *TxFetcher) loop() {

case <-waitTrigger:
// At least one transaction's waiting time ran out, push all expired
// ones into the retrieval queues
// ones into the announces
actives := make(map[string]struct{})
for hash, instance := range f.waittime {
if time.Duration(f.clock.Now()-instance)+txGatherSlack > txArriveTimeout {
// Transaction expired without propagation, schedule for retrieval
if f.announced[hash] != nil {
panic("announce tracker already contains waitlist item")
if f.announced(hash) {
panic("announced tracker already contains waitlist item")
}
f.announced[hash] = f.waitlist[hash]
for peer := range f.waitlist[hash] {
if announces := f.announces[peer]; announces != nil {
announces[hash] = f.waitslots[peer][hash]
Expand Down Expand Up @@ -616,18 +585,7 @@ func (f *TxFetcher) loop() {
}
}
// Move the delivery back from fetching to queued
if _, ok := f.announced[hash]; ok {
panic("announced tracker already contains alternate item")
}
if f.alternates[hash] != nil { // nil if tx was broadcast during fetch
f.announced[hash] = f.alternates[hash]
}
delete(f.announced[hash], peer)
if len(f.announced[hash]) == 0 {
delete(f.announced, hash)
}
delete(f.announces[peer], hash)
delete(f.alternates, hash)
delete(f.fetching, hash)
}
if len(f.announces[peer]) == 0 {
Expand Down Expand Up @@ -699,8 +657,6 @@ func (f *TxFetcher) loop() {
delete(f.announces, peer)
}
}
delete(f.announced, hash)
delete(f.alternates, hash)

// If a transaction currently being fetched from a different
// origin was delivered (delivery stolen), mark it so the
Expand Down Expand Up @@ -752,20 +708,12 @@ func (f *TxFetcher) loop() {
}
if _, ok := delivered[hash]; !ok {
if i < cutoff {
delete(f.alternates[hash], delivery.origin)
delete(f.announces[delivery.origin], hash)
if len(f.announces[delivery.origin]) == 0 {
delete(f.announces, delivery.origin)
}
}
if len(f.alternates[hash]) > 0 {
if _, ok := f.announced[hash]; ok {
panic(fmt.Sprintf("announced tracker already contains alternate item: %v", f.announced[hash]))
}
f.announced[hash] = f.alternates[hash]
}
}
delete(f.alternates, hash)
delete(f.fetching, hash)
}
// Something was delivered, try to reschedule requests
Expand Down Expand Up @@ -797,28 +745,13 @@ func (f *TxFetcher) loop() {
continue
}
}
// Undelivered hash, reschedule if there's an alternative origin available
delete(f.alternates[hash], drop.peer)
if len(f.alternates[hash]) == 0 {
delete(f.alternates, hash)
} else {
f.announced[hash] = f.alternates[hash]
delete(f.alternates, hash)
}
delete(f.fetching, hash)
}
delete(f.requests, drop.peer)
}
// Clean up general announcement tracking
if _, ok := f.announces[drop.peer]; ok {
for hash := range f.announces[drop.peer] {
delete(f.announced[hash], drop.peer)
if len(f.announced[hash]) == 0 {
delete(f.announced, hash)
}
}
delete(f.announces, drop.peer)
}
delete(f.announces, drop.peer)

// If a request was cancelled, check if anything needs to be rescheduled
if request != nil {
f.scheduleFetches(timeoutTimer, timeoutTrigger, nil)
Expand All @@ -832,7 +765,6 @@ func (f *TxFetcher) loop() {
txFetcherWaitingPeers.Update(int64(len(f.waitslots)))
txFetcherWaitingHashes.Update(int64(len(f.waitlist)))
txFetcherQueueingPeers.Update(int64(len(f.announces) - len(f.requests)))
txFetcherQueueingHashes.Update(int64(len(f.announced)))
txFetcherFetchingPeers.Update(int64(len(f.requests)))
txFetcherFetchingHashes.Update(int64(len(f.fetching)))

Expand Down Expand Up @@ -942,12 +874,6 @@ func (f *TxFetcher) scheduleFetches(timer *mclock.Timer, timeout chan struct{},
// Mark the hash as fetching and stash away possible alternates
f.fetching[hash] = peer

if _, ok := f.alternates[hash]; ok {
panic(fmt.Sprintf("alternate tracker already contains fetching item: %v", f.alternates[hash]))
}
f.alternates[hash] = f.announced[hash]
delete(f.announced, hash)

// Accumulate the hash and stop if the limit was reached
hashes = append(hashes, hash)
if len(hashes) >= maxTxRetrievals {
Expand Down Expand Up @@ -1034,3 +960,12 @@ func rotateStrings(slice []string, n int) {
slice[i] = orig[(i+n)%len(orig)]
}
}

func (f *TxFetcher) announced(hash common.Hash) bool {
for _, hashes := range f.announces {
if hashes[hash] != nil {
return true
}
}
return false
}
57 changes: 3 additions & 54 deletions eth/fetcher/tx_fetcher_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -459,6 +459,7 @@ func TestTransactionFetcherSingletonRequesting(t *testing.T) {
{common.Hash{0x06}, types.LegacyTxType, 666},
},
}),
// Step 14
isScheduled{
tracking: map[string][]announce{
"A": {
Expand Down Expand Up @@ -2017,6 +2018,7 @@ func testTransactionFetcher(t *testing.T, tt txFetcherTest) {
t.Errorf("step %d: peer %s extra in announces", i, peer)
}
}

// Check that all announces required to be fetching are in the
// appropriate sets
for peer, hashes := range step.fetching {
Expand Down Expand Up @@ -2062,31 +2064,6 @@ func testTransactionFetcher(t *testing.T, tt txFetcherTest) {
t.Errorf("step %d: hash %x extra in fetching", i, hash)
}
}
for _, hashes := range step.fetching {
for _, hash := range hashes {
alternates := fetcher.alternates[hash]
if alternates == nil {
t.Errorf("step %d: hash %x missing from alternates", i, hash)
continue
}
for peer := range alternates {
if _, ok := fetcher.announces[peer]; !ok {
t.Errorf("step %d: peer %s extra in alternates", i, peer)
continue
}
if _, ok := fetcher.announces[peer][hash]; !ok {
t.Errorf("step %d, peer %s: hash %x extra in alternates", i, hash, peer)
continue
}
}
for p := range fetcher.announced[hash] {
if _, ok := alternates[p]; !ok {
t.Errorf("step %d, hash %x: peer %s missing from alternates", i, hash, p)
continue
}
}
}
}
for peer, hashes := range step.dangling {
request := fetcher.requests[peer]
if request == nil {
Expand All @@ -2104,34 +2081,6 @@ func testTransactionFetcher(t *testing.T, tt txFetcherTest) {
}
}
}
// Check that all transaction announces that are scheduled for
// retrieval but not actively being downloaded are tracked only
// in the stage 2 `announced` map.
var queued []common.Hash
for _, announces := range step.tracking {
for _, ann := range announces {
var found bool
for _, hs := range step.fetching {
if slices.Contains(hs, ann.hash) {
found = true
break
}
}
if !found {
queued = append(queued, ann.hash)
}
}
}
for _, hash := range queued {
if _, ok := fetcher.announced[hash]; !ok {
t.Errorf("step %d: hash %x missing from announced", i, hash)
}
}
for hash := range fetcher.announced {
if !slices.Contains(queued, hash) {
t.Errorf("step %d: hash %x extra in announced", i, hash)
}
}

case isUnderpriced:
if fetcher.underpriced.Len() != int(step) {
Expand All @@ -2144,7 +2093,7 @@ func testTransactionFetcher(t *testing.T, tt txFetcherTest) {
// After every step, cross validate the internal uniqueness invariants
// between stage one and stage two.
for hash := range fetcher.waittime {
if _, ok := fetcher.announced[hash]; ok {
if fetcher.announced(hash) {
t.Errorf("step %d: hash %s present in both stage 1 and 2", i, hash)
}
}
Expand Down