Revert "Federation backoff fixes and tests (#2792)"

This reverts commit dcedd1b6bf1e890ff425bdf1fcd8a2e0850778b5.

3 files changed, 0 insertions, 433 deletions

diff --git a/federationapi/queue/destinationqueue.go b/federationapi/queue/destinationqueue.go
index 4ae554ef..5cb8cae1 100644
--- a/federationapi/queue/destinationqueue.go
+++ b/federationapi/queue/destinationqueue.go
@@ -75,7 +75,6 @@ func (oq *destinationQueue) sendEvent(event *gomatrixserverlib.HeaderedEvent, re
 		logrus.Errorf("attempt to send nil PDU with destination %q", oq.destination)
 		return
 	}
-
 	// Create a database entry that associates the given PDU NID with
 	// this destination queue. We'll then be able to retrieve the PDU
 	// later.
@@ -109,8 +108,6 @@ func (oq *destinationQueue) sendEvent(event *gomatrixserverlib.HeaderedEvent, re
 		case oq.notify <- struct{}{}:
 		default:
 		}
-	} else {
-		oq.overflowed.Store(true)
 	}
 }
 
@@ -156,8 +153,6 @@ func (oq *destinationQueue) sendEDU(event *gomatrixserverlib.EDU, receipt *share
 		case oq.notify <- struct{}{}:
 		default:
 		}
-	} else {
-		oq.overflowed.Store(true)
 	}
 }
 
@@ -340,11 +335,6 @@ func (oq *destinationQueue) backgroundSend() {
 			// We failed to send the transaction. Mark it as a failure.
 			oq.statistics.Failure()
 
-			// Queue up another attempt since the transaction failed.
-			select {
-			case oq.notify <- struct{}{}:
-			default:
-			}
 		} else if transaction {
 			// If we successfully sent the transaction then clear out
 			// the pending events and EDUs, and wipe our transaction ID.
diff --git a/federationapi/queue/queue.go b/federationapi/queue/queue.go
index 5d352eca..8245aa5b 100644
--- a/federationapi/queue/queue.go
+++ b/federationapi/queue/queue.go
@@ -332,7 +332,6 @@ func (oqs *OutgoingQueues) RetryServer(srv gomatrixserverlib.ServerName) {
 	if oqs.disabled {
 		return
 	}
-	oqs.statistics.ForServer(srv).RemoveBlacklist()
 	if queue := oqs.getQueue(srv); queue != nil {
 		queue.wakeQueueIfNeeded()
 	}
diff --git a/federationapi/queue/queue_test.go b/federationapi/queue/queue_test.go
deleted file mode 100644
index 8e4a675f..00000000
--- a/federationapi/queue/queue_test.go
+++ /dev/null
@@ -1,422 +0,0 @@
-// Copyright 2022 The Matrix.org Foundation C.I.C.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package queue
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"sync"
-	"testing"
-	"time"
-
-	"go.uber.org/atomic"
-	"gotest.tools/v3/poll"
-
-	"github.com/matrix-org/dendrite/federationapi/api"
-	"github.com/matrix-org/dendrite/federationapi/statistics"
-	"github.com/matrix-org/dendrite/federationapi/storage"
-	"github.com/matrix-org/dendrite/federationapi/storage/shared"
-	rsapi "github.com/matrix-org/dendrite/roomserver/api"
-	"github.com/matrix-org/dendrite/setup/process"
-	"github.com/matrix-org/dendrite/test"
-	"github.com/matrix-org/gomatrixserverlib"
-	"github.com/pkg/errors"
-	"github.com/stretchr/testify/assert"
-)
-
-var dbMutex sync.Mutex
-
-type fakeDatabase struct {
-	storage.Database
-	pendingPDUServers  map[gomatrixserverlib.ServerName]struct{}
-	pendingEDUServers  map[gomatrixserverlib.ServerName]struct{}
-	blacklistedServers map[gomatrixserverlib.ServerName]struct{}
-	pendingPDUs        map[*shared.Receipt]*gomatrixserverlib.HeaderedEvent
-	pendingEDUs        map[*shared.Receipt]*gomatrixserverlib.EDU
-	associatedPDUs     map[gomatrixserverlib.ServerName]map[*shared.Receipt]struct{}
-	associatedEDUs     map[gomatrixserverlib.ServerName]map[*shared.Receipt]struct{}
-}
-
-func (d *fakeDatabase) StoreJSON(ctx context.Context, js string) (*shared.Receipt, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	var event gomatrixserverlib.HeaderedEvent
-	if err := json.Unmarshal([]byte(js), &event); err == nil {
-		receipt := &shared.Receipt{}
-		d.pendingPDUs[receipt] = &event
-		return receipt, nil
-	}
-
-	var edu gomatrixserverlib.EDU
-	if err := json.Unmarshal([]byte(js), &edu); err == nil {
-		receipt := &shared.Receipt{}
-		d.pendingEDUs[receipt] = &edu
-		return receipt, nil
-	}
-
-	return nil, errors.New("Failed to determine type of json to store")
-}
-
-func (d *fakeDatabase) GetPendingPDUs(ctx context.Context, serverName gomatrixserverlib.ServerName, limit int) (pdus map[*shared.Receipt]*gomatrixserverlib.HeaderedEvent, err error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	pdus = make(map[*shared.Receipt]*gomatrixserverlib.HeaderedEvent)
-	if receipts, ok := d.associatedPDUs[serverName]; ok {
-		for receipt := range receipts {
-			if event, ok := d.pendingPDUs[receipt]; ok {
-				pdus[receipt] = event
-			}
-		}
-	}
-	return pdus, nil
-}
-
-func (d *fakeDatabase) GetPendingEDUs(ctx context.Context, serverName gomatrixserverlib.ServerName, limit int) (edus map[*shared.Receipt]*gomatrixserverlib.EDU, err error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	edus = make(map[*shared.Receipt]*gomatrixserverlib.EDU)
-	if receipts, ok := d.associatedEDUs[serverName]; ok {
-		for receipt := range receipts {
-			if event, ok := d.pendingEDUs[receipt]; ok {
-				edus[receipt] = event
-			}
-		}
-	}
-	return edus, nil
-}
-
-func (d *fakeDatabase) AssociatePDUWithDestination(ctx context.Context, transactionID gomatrixserverlib.TransactionID, serverName gomatrixserverlib.ServerName, receipt *shared.Receipt) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	if _, ok := d.pendingPDUs[receipt]; ok {
-		if _, ok := d.associatedPDUs[serverName]; !ok {
-			d.associatedPDUs[serverName] = make(map[*shared.Receipt]struct{})
-		}
-		d.associatedPDUs[serverName][receipt] = struct{}{}
-		return nil
-	} else {
-		return errors.New("PDU doesn't exist")
-	}
-}
-
-func (d *fakeDatabase) AssociateEDUWithDestination(ctx context.Context, serverName gomatrixserverlib.ServerName, receipt *shared.Receipt, eduType string, expireEDUTypes map[string]time.Duration) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	if _, ok := d.pendingEDUs[receipt]; ok {
-		if _, ok := d.associatedEDUs[serverName]; !ok {
-			d.associatedEDUs[serverName] = make(map[*shared.Receipt]struct{})
-		}
-		d.associatedEDUs[serverName][receipt] = struct{}{}
-		return nil
-	} else {
-		return errors.New("EDU doesn't exist")
-	}
-}
-
-func (d *fakeDatabase) CleanPDUs(ctx context.Context, serverName gomatrixserverlib.ServerName, receipts []*shared.Receipt) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	if pdus, ok := d.associatedPDUs[serverName]; ok {
-		for _, receipt := range receipts {
-			delete(pdus, receipt)
-		}
-	}
-
-	return nil
-}
-
-func (d *fakeDatabase) CleanEDUs(ctx context.Context, serverName gomatrixserverlib.ServerName, receipts []*shared.Receipt) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	if edus, ok := d.associatedEDUs[serverName]; ok {
-		for _, receipt := range receipts {
-			delete(edus, receipt)
-		}
-	}
-
-	return nil
-}
-
-func (d *fakeDatabase) GetPendingPDUCount(ctx context.Context, serverName gomatrixserverlib.ServerName) (int64, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	var count int64
-	if pdus, ok := d.associatedPDUs[serverName]; ok {
-		count = int64(len(pdus))
-	}
-	return count, nil
-}
-
-func (d *fakeDatabase) GetPendingEDUCount(ctx context.Context, serverName gomatrixserverlib.ServerName) (int64, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	var count int64
-	if edus, ok := d.associatedEDUs[serverName]; ok {
-		count = int64(len(edus))
-	}
-	return count, nil
-}
-
-func (d *fakeDatabase) GetPendingPDUServerNames(ctx context.Context) ([]gomatrixserverlib.ServerName, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	servers := []gomatrixserverlib.ServerName{}
-	for server := range d.pendingPDUServers {
-		servers = append(servers, server)
-	}
-	return servers, nil
-}
-
-func (d *fakeDatabase) GetPendingEDUServerNames(ctx context.Context) ([]gomatrixserverlib.ServerName, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	servers := []gomatrixserverlib.ServerName{}
-	for server := range d.pendingEDUServers {
-		servers = append(servers, server)
-	}
-	return servers, nil
-}
-
-func (d *fakeDatabase) AddServerToBlacklist(serverName gomatrixserverlib.ServerName) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	d.blacklistedServers[serverName] = struct{}{}
-	return nil
-}
-
-func (d *fakeDatabase) RemoveServerFromBlacklist(serverName gomatrixserverlib.ServerName) error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	delete(d.blacklistedServers, serverName)
-	return nil
-}
-
-func (d *fakeDatabase) RemoveAllServersFromBlacklist() error {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	d.blacklistedServers = make(map[gomatrixserverlib.ServerName]struct{})
-	return nil
-}
-
-func (d *fakeDatabase) IsServerBlacklisted(serverName gomatrixserverlib.ServerName) (bool, error) {
-	dbMutex.Lock()
-	defer dbMutex.Unlock()
-
-	isBlacklisted := false
-	if _, ok := d.blacklistedServers[serverName]; ok {
-		isBlacklisted = true
-	}
-
-	return isBlacklisted, nil
-}
-
-type stubFederationRoomServerAPI struct {
-	rsapi.FederationRoomserverAPI
-}
-
-func (r *stubFederationRoomServerAPI) QueryServerBannedFromRoom(ctx context.Context, req *rsapi.QueryServerBannedFromRoomRequest, res *rsapi.QueryServerBannedFromRoomResponse) error {
-	res.Banned = false
-	return nil
-}
-
-type stubFederationClient struct {
-	api.FederationClient
-	shouldTxSucceed bool
-	txCount         atomic.Uint32
-}
-
-func (f *stubFederationClient) SendTransaction(ctx context.Context, t gomatrixserverlib.Transaction) (res gomatrixserverlib.RespSend, err error) {
-	var result error
-	if !f.shouldTxSucceed {
-		result = fmt.Errorf("transaction failed")
-	}
-
-	f.txCount.Add(1)
-	return gomatrixserverlib.RespSend{}, result
-}
-
-func createDatabase() storage.Database {
-	return &fakeDatabase{
-		pendingPDUServers:  make(map[gomatrixserverlib.ServerName]struct{}),
-		pendingEDUServers:  make(map[gomatrixserverlib.ServerName]struct{}),
-		blacklistedServers: make(map[gomatrixserverlib.ServerName]struct{}),
-		pendingPDUs:        make(map[*shared.Receipt]*gomatrixserverlib.HeaderedEvent),
-		pendingEDUs:        make(map[*shared.Receipt]*gomatrixserverlib.EDU),
-		associatedPDUs:     make(map[gomatrixserverlib.ServerName]map[*shared.Receipt]struct{}),
-	}
-}
-
-func mustCreateEvent(t *testing.T) *gomatrixserverlib.HeaderedEvent {
-	t.Helper()
-	content := `{"type":"m.room.message"}`
-	ev, err := gomatrixserverlib.NewEventFromTrustedJSON([]byte(content), false, gomatrixserverlib.RoomVersionV10)
-	if err != nil {
-		t.Fatalf("failed to create event: %v", err)
-	}
-	return ev.Headered(gomatrixserverlib.RoomVersionV10)
-}
-
-func testSetup(failuresUntilBlacklist uint32, shouldTxSucceed bool) (storage.Database, *stubFederationClient, *OutgoingQueues) {
-	db := createDatabase()
-
-	fc := &stubFederationClient{
-		shouldTxSucceed: shouldTxSucceed,
-		txCount:         *atomic.NewUint32(0),
-	}
-	rs := &stubFederationRoomServerAPI{}
-	stats := &statistics.Statistics{
-		DB:                     db,
-		FailuresUntilBlacklist: failuresUntilBlacklist,
-	}
-	signingInfo := &SigningInfo{
-		KeyID:      "ed25519:auto",
-		PrivateKey: test.PrivateKeyA,
-		ServerName: "localhost",
-	}
-	queues := NewOutgoingQueues(db, process.NewProcessContext(), false, "localhost", fc, rs, stats, signingInfo)
-
-	return db, fc, queues
-}
-
-func TestSendTransactionOnSuccessRemovedFromDB(t *testing.T) {
-	ctx := context.Background()
-	failuresUntilBlacklist := uint32(16)
-	destination := gomatrixserverlib.ServerName("remotehost")
-	db, fc, queues := testSetup(failuresUntilBlacklist, true)
-
-	ev := mustCreateEvent(t)
-	err := queues.SendEvent(ev, "localhost", []gomatrixserverlib.ServerName{destination})
-	assert.NoError(t, err)
-
-	check := func(log poll.LogT) poll.Result {
-		if fc.txCount.Load() >= 1 {
-			data, err := db.GetPendingPDUs(ctx, destination, 100)
-			assert.NoError(t, err)
-			if len(data) == 0 {
-				return poll.Success()
-			}
-			return poll.Continue("waiting for event to be removed from database")
-		}
-		return poll.Continue("waiting for more send attempts before checking database")
-	}
-	poll.WaitOn(t, check, poll.WithTimeout(5*time.Second), poll.WithDelay(100*time.Millisecond))
-}
-
-func TestSendTransactionOnFailStoredInDB(t *testing.T) {
-	ctx := context.Background()
-	failuresUntilBlacklist := uint32(16)
-	destination := gomatrixserverlib.ServerName("remotehost")
-	db, fc, queues := testSetup(failuresUntilBlacklist, false)
-
-	ev := mustCreateEvent(t)
-	err := queues.SendEvent(ev, "localhost", []gomatrixserverlib.ServerName{destination})
-	assert.NoError(t, err)
-
-	check := func(log poll.LogT) poll.Result {
-		// Wait for 2 backoff attempts to ensure there was adequate time to attempt sending
-		if fc.txCount.Load() >= 2 {
-			data, err := db.GetPendingPDUs(ctx, destination, 100)
-			assert.NoError(t, err)
-			if len(data) == 1 {
-				return poll.Success()
-			}
-			return poll.Continue("waiting for event to be added to database")
-		}
-		return poll.Continue("waiting for more send attempts before checking database")
-	}
-	poll.WaitOn(t, check, poll.WithTimeout(5*time.Second), poll.WithDelay(100*time.Millisecond))
-}
-
-func TestSendTransactionMultipleFailuresBlacklisted(t *testing.T) {
-	ctx := context.Background()
-	failuresUntilBlacklist := uint32(2)
-	destination := gomatrixserverlib.ServerName("remotehost")
-	db, fc, queues := testSetup(failuresUntilBlacklist, false)
-
-	ev := mustCreateEvent(t)
-	err := queues.SendEvent(ev, "localhost", []gomatrixserverlib.ServerName{destination})
-	assert.NoError(t, err)
-
-	check := func(log poll.LogT) poll.Result {
-		if fc.txCount.Load() >= failuresUntilBlacklist {
-			data, err := db.GetPendingPDUs(ctx, destination, 100)
-			assert.NoError(t, err)
-			if len(data) == 1 {
-				if val, _ := db.IsServerBlacklisted(destination); val {
-					return poll.Success()
-				}
-				return poll.Continue("waiting for server to be blacklisted")
-			}
-			return poll.Continue("waiting for event to be added to database")
-		}
-		return poll.Continue("waiting for more send attempts before checking database")
-	}
-	poll.WaitOn(t, check, poll.WithTimeout(5*time.Second), poll.WithDelay(100*time.Millisecond))
-}
-
-func TestRetryServerSendsSuccessfully(t *testing.T) {
-	ctx := context.Background()
-	failuresUntilBlacklist := uint32(1)
-	destination := gomatrixserverlib.ServerName("remotehost")
-	db, fc, queues := testSetup(failuresUntilBlacklist, false)
-
-	ev := mustCreateEvent(t)
-	err := queues.SendEvent(ev, "localhost", []gomatrixserverlib.ServerName{destination})
-	assert.NoError(t, err)
-
-	checkBlacklisted := func(log poll.LogT) poll.Result {
-		if fc.txCount.Load() >= failuresUntilBlacklist {
-			data, err := db.GetPendingPDUs(ctx, destination, 100)
-			assert.NoError(t, err)
-			if len(data) == 1 {
-				if val, _ := db.IsServerBlacklisted(destination); val {
-					return poll.Success()
-				}
-				return poll.Continue("waiting for server to be blacklisted")
-			}
-			return poll.Continue("waiting for event to be added to database")
-		}
-		return poll.Continue("waiting for more send attempts before checking database")
-	}
-	poll.WaitOn(t, checkBlacklisted, poll.WithTimeout(5*time.Second), poll.WithDelay(100*time.Millisecond))
-
-	fc.shouldTxSucceed = true
-	db.RemoveServerFromBlacklist(destination)
-	queues.RetryServer(destination)
-	checkRetry := func(log poll.LogT) poll.Result {
-		data, err := db.GetPendingPDUs(ctx, destination, 100)
-		assert.NoError(t, err)
-		if len(data) == 0 {
-			return poll.Success()
-		}
-		return poll.Continue("waiting for event to be removed from database")
-	}
-	poll.WaitOn(t, checkRetry, poll.WithTimeout(5*time.Second), poll.WithDelay(100*time.Millisecond))
-}