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Remove special-cased fast backfill

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It's not particularly useful and causes the portals to jump around more
This commit is contained in:
Tulir Asokan 2022-03-14 23:53:50 +02:00
parent df64bb0e10
commit 44f232f37b
1 changed files with 10 additions and 75 deletions
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85
historysync.go
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@ -17,6 +17,7 @@
package main
import (
"fmt"
"sort"
"sync"
"time"
@ -34,12 +35,6 @@ import (
// region User history sync handling
const (
FastBackfillPortalCount = 20
FastBackfillMessageCount = 20
FastBackfillMessageCap = 30
)
type portalToBackfill struct {
portal *Portal
conv *waProto.Conversation
@ -85,52 +80,26 @@ func (user *User) handleHistorySync(evt *waProto.HistorySync) {
if evt == nil || evt.SyncType == nil || evt.GetSyncType() == waProto.HistorySync_INITIAL_STATUS_V3 || evt.GetSyncType() == waProto.HistorySync_PUSH_NAME {
return
}
user.log.Infofln("Handling history sync with type %s, %d conversations, chunk order %d, progress %d%%", evt.GetSyncType(), len(evt.GetConversations()), evt.GetChunkOrder(), evt.GetProgress())
description := fmt.Sprintf("type %s, %d conversations, chunk order %d, progress %d%%", evt.GetSyncType(), len(evt.GetConversations()), evt.GetChunkOrder(), evt.GetProgress())
user.log.Infoln("Handling history sync with", description)
conversations := conversationList(evt.GetConversations())
// We want to handle recent conversations first
sort.Sort(sort.Reverse(conversations))
portalsToBackfill := make(chan portalToBackfill, len(conversations))
var backfillWait, fastBackfillWait sync.WaitGroup
var fastBackfillWaitDoneOnce sync.Once
// We have to add 1 to the waitgroup beforehand to make sure the wait in the goroutine doesn't finish
// before we add the actual numbers.
fastBackfillWait.Add(1)
var backfillWait sync.WaitGroup
backfillWait.Add(1)
go func() {
// Wait for the fast parallelized backfill to complete, then start the slow backfill loop (see explanation below)
fastBackfillWait.Wait()
user.slowBackfillLoop(portalsToBackfill, backfillWait.Done)
}()
for i, conv := range conversations {
// This will create portals and start backfilling for them.
//
// The first 20 (FastBackfillPortalCount) portals will be parallelized, where the portal is
// created and recent messages are backfilled in parallel. Other portals will be created
// synchronously (and this will only return when they're created).
//
// For said other portals, and older messages in the parallelized portals, backfilling also
// happens synchronously: the portals and messages to backfill are added to the
// portalsToBackfill channel, which is consumed one-by-one in the slowBackfillLoop method.
// That loop is only started after the fast parallelized backfill is completed.
user.handleHistorySyncConversation(i, conv, &fastBackfillWait, portalsToBackfill)
if i == FastBackfillPortalCount {
// There won't be any more portals going the fast backfill route, so remove the 1 item
// that was added to the wait group at the beginning.
fastBackfillWaitDoneOnce.Do(fastBackfillWait.Done)
go user.backfillLoop(portalsToBackfill, backfillWait.Done)
for _, conv := range conversations {
user.handleHistorySyncConversation(conv, portalsToBackfill)
}
}
fastBackfillWaitDoneOnce.Do(fastBackfillWait.Done)
// Wait for fast backfill to complete to make sure everything necessary is in the slow backfill queue,
// then close the slow backfill queue and wait for the loop to finish handling the queue.
fastBackfillWait.Wait()
close(portalsToBackfill)
backfillWait.Wait()
user.log.Infofln("Finished handling history sync with type %s, %d conversations, chunk order %d, progress %d%%", evt.GetSyncType(), len(conversations), evt.GetChunkOrder(), evt.GetProgress())
user.log.Infoln("Finished handling history sync with", description)
}
func (user *User) slowBackfillLoop(ch chan portalToBackfill, done func()) {
func (user *User) backfillLoop(ch chan portalToBackfill, done func()) {
defer done()
for ptb := range ch {
if len(ptb.msgs) > 0 {
@ -145,7 +114,7 @@ func (user *User) slowBackfillLoop(ch chan portalToBackfill, done func()) {
}
}
func (user *User) handleHistorySyncConversation(index int, conv *waProto.Conversation, fastBackfillWait *sync.WaitGroup, portalsToBackfill chan portalToBackfill) {
func (user *User) handleHistorySyncConversation(conv *waProto.Conversation, portalsToBackfill chan portalToBackfill) {
jid, err := types.ParseJID(conv.GetId())
if err != nil {
user.log.Warnfln("Failed to parse chat JID '%s' in history sync: %v", conv.GetId(), err)
@ -180,12 +149,6 @@ func (user *User) handleHistorySyncConversation(index int, conv *waProto.Convers
}
ptb := portalToBackfill{portal: portal, conv: conv, msgs: msgs}
if len(portal.MXID) == 0 {
// For the first few chats, do the portal creation and some backfilling in parallel to populate the chat list ASAP
if index < FastBackfillPortalCount {
fastBackfillWait.Add(1)
go user.fastBackfillRoutine(ptb, fastBackfillWait.Done, portalsToBackfill)
return
}
user.log.Debugln("Creating portal for", portal.Key.JID, "as part of history sync handling")
err = portal.CreateMatrixRoom(user, getPartialInfoFromConversation(jid, conv), false)
if err != nil {
@ -234,34 +197,6 @@ func (user *User) shouldCreatePortalForHistorySync(conv *waProto.Conversation, p
return false
}
func (user *User) fastBackfillRoutine(ptb portalToBackfill, done func(), slowBackfillChan chan portalToBackfill) {
defer done()
user.log.Debugln("Asynchronously creating portal for", ptb.portal.Key.JID, "as part of history sync handling")
err := ptb.portal.CreateMatrixRoom(user, getPartialInfoFromConversation(ptb.portal.Key.JID, ptb.conv), false)
if err != nil {
user.log.Warnfln("Failed to create room for %s during backfill: %v", ptb.portal.Key.JID, err)
return
}
if user.bridge.Config.Bridge.HistorySync.Backfill {
if len(ptb.msgs) > FastBackfillMessageCap {
user.log.Debugfln("Bridging first %d messages of history sync payload for %s (async)", FastBackfillMessageCount, ptb.portal.Key.JID)
ptb.portal.backfill(user, ptb.msgs[:FastBackfillMessageCount])
// Send the rest of the messages off to the slow backfill queue
ptb.msgs = ptb.msgs[FastBackfillMessageCount:]
slowBackfillChan <- ptb
} else if len(ptb.msgs) > 0 {
user.log.Debugfln("Bridging all messages (%d) of history sync payload for %s (async)", len(ptb.msgs), ptb.portal.Key.JID)
ptb.portal.backfill(user, ptb.msgs)
} else {
user.log.Debugfln("Not backfilling %s: no bridgeable messages found", ptb.portal.Key.JID)
}
} else {
user.log.Debugln("Backfill is disabled, not bridging history sync payload for", ptb.portal.Key.JID)
}
}
func filterMessagesToBackfill(messages []*waProto.HistorySyncMsg) []*waProto.WebMessageInfo {
filtered := make([]*waProto.WebMessageInfo, 0, len(messages))
for _, msg := range messages {