Add non-MSC2716 backfill support

CHANGELOG.md

@@ -1,3 +1,8 @@
+# v0.9.0 (unreleased)
+
+* Removed MSC2716 support.
+* Added legacy backfill support.
+
 # v0.8.6 (2023-06-16)
 
 * Implemented intentional mentions for outgoing messages.

config/bridge.go

@@ -68,6 +68,7 @@ type BridgeConfig struct {
 			StorageQuota uint32 `yaml:"storage_quota_mb"`
 		}
 		MaxInitialConversations int `yaml:"max_initial_conversations"`
+		MessageCount            int `yaml:"message_count"`
 		UnreadHoursThreshold    int `yaml:"unread_hours_threshold"`
 
 		Immediate struct {

config/upgrade.go

@@ -56,6 +56,7 @@ func DoUpgrade(helper *up.Helper) {
 	helper.Copy(up.Str, "bridge", "history_sync", "media_requests", "request_method")
 	helper.Copy(up.Int, "bridge", "history_sync", "media_requests", "request_local_time")
 	helper.Copy(up.Int, "bridge", "history_sync", "max_initial_conversations")
+	helper.Copy(up.Int, "bridge", "history_sync", "message_count")
 	helper.Copy(up.Int, "bridge", "history_sync", "unread_hours_threshold")
 	helper.Copy(up.Int, "bridge", "history_sync", "immediate", "worker_count")
 	helper.Copy(up.Int, "bridge", "history_sync", "immediate", "max_events")

example-config.yaml

@@ -127,12 +127,8 @@ bridge:
     portal_message_buffer: 128
     # Settings for handling history sync payloads.
     history_sync:
-        # Enable backfilling history sync payloads from WhatsApp using batch sending?
+        # Enable backfilling history sync payloads from WhatsApp?
-        # This requires a server with MSC2716 support, which is currently an experimental feature in synapse.
+        backfill: true
-        # It can be enabled by setting experimental_features -> msc2716_enabled to true in homeserver.yaml.
-        # Note that prior to Synapse 1.49, there were some bugs with the implementation, especially if using event persistence workers.
-        # There are also still some issues in Synapse's federation implementation.
-        backfill: false
         # Should the bridge create portals for chats in the history sync payload?
         # This has no effect unless backfill is enabled.
         create_portals: true
@@ -171,16 +167,22 @@ bridge:
             # be sent (in minutes after midnight)?
             request_local_time: 120
         # The maximum number of initial conversations that should be synced.
-        # Other conversations will be backfilled on demand when the start PM
+        # Other conversations will be backfilled on demand when receiving a message or when initiating a direct chat.
-        # provisioning endpoint is used or when a message comes in from that
-        # chat.
         max_initial_conversations: -1
+        # Number of messages to backfill in each conversation
+        message_count: 50
         # If this value is greater than 0, then if the conversation's last
         # message was more than this number of hours ago, then the conversation
         # will automatically be marked it as read.
         # Conversations that have a last message that is less than this number
         # of hours ago will have their unread status synced from WhatsApp.
         unread_hours_threshold: 0
+
+        ###############################################################################
+        # The settings below are only applicable for backfilling using batch sending, #
+        # which is no longer supported in Synapse.                                    #
+        ###############################################################################
+
         # Settings for immediate backfills. These backfills should generally be
         # small and their main purpose is to populate each of the initial chats
         # (as configured by max_initial_conversations) with a few messages so
@@ -220,6 +222,7 @@ bridge:
             - start_days_ago: -1
               max_batch_events: 500
               batch_delay: 10
+
     # Should puppet avatars be fetched from the server even if an avatar is already set?
     user_avatar_sync: true
     # Should Matrix users leaving groups be bridged to WhatsApp?

go.mod

@@ -18,7 +18,7 @@ require (
 	golang.org/x/net v0.11.0
 	google.golang.org/protobuf v1.30.0
 	maunium.net/go/maulogger/v2 v2.4.1
-	maunium.net/go/mautrix v0.15.3
+	maunium.net/go/mautrix v0.15.4-0.20230618223441-8d500be4cbb2
 )
 
 require (

go.sum

@@ -131,5 +131,5 @@ maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
 maunium.net/go/maulogger/v2 v2.4.1 h1:N7zSdd0mZkB2m2JtFUsiGTQQAdP0YeFWT7YMc80yAL8=
 maunium.net/go/maulogger/v2 v2.4.1/go.mod h1:omPuYwYBILeVQobz8uO3XC8DIRuEb5rXYlQSuqrbCho=
-maunium.net/go/mautrix v0.15.3 h1:C9BHSUM0gYbuZmAtopuLjIcH5XHLb/ZjTEz7nN+0jN0=
+maunium.net/go/mautrix v0.15.4-0.20230618223441-8d500be4cbb2 h1:a7xytO4aYZchg/j8vFqYFkxS75eIgJwMsSsqY7FO6kg=
-maunium.net/go/mautrix v0.15.3/go.mod h1:zLrQqdxJlLkurRCozTc9CL6FySkgZlO/kpCYxBILSLE=
+maunium.net/go/mautrix v0.15.4-0.20230618223441-8d500be4cbb2/go.mod h1:zLrQqdxJlLkurRCozTc9CL6FySkgZlO/kpCYxBILSLE=

historysync.go

@@ -60,6 +60,8 @@ func (user *User) handleHistorySyncsLoop() {
 		return
 	}
 
+	batchSend := user.bridge.SpecVersions.Supports(mautrix.BeeperFeatureBatchSending)
+	if batchSend {
 		// Start the backfill queue.
 		user.BackfillQueue = &BackfillQueue{
 			BackfillQuery:   user.bridge.DB.Backfill,
@@ -78,6 +80,7 @@ func (user *User) handleHistorySyncsLoop() {
 		// overload the homeserver. Users can configure their backfill stages
 		// to be more or less aggressive with backfilling at this stage.
 		go user.HandleBackfillRequestsLoop([]database.BackfillType{database.BackfillDeferred}, forwardAndImmediate)
+	}
 
 	if user.bridge.Config.Bridge.HistorySync.MediaRequests.AutoRequestMedia &&
 		user.bridge.Config.Bridge.HistorySync.MediaRequests.RequestMethod == config.MediaRequestMethodLocalTime {
@@ -92,9 +95,13 @@ func (user *User) handleHistorySyncsLoop() {
 			if evt == nil {
 				return
 			}
-			user.handleHistorySync(user.BackfillQueue, evt.Data)
+			user.storeHistorySync(evt.Data)
 		case <-user.enqueueBackfillsTimer.C:
+			if batchSend {
 				user.enqueueAllBackfills()
+			} else {
+				user.backfillAll()
+			}
 		}
 	}
 }
@@ -125,6 +132,66 @@ func (user *User) enqueueAllBackfills() {
 	}
 }
 
+func (user *User) backfillAll() {
+	conversations := user.bridge.DB.HistorySync.GetNMostRecentConversations(user.MXID, -1)
+	if len(conversations) > 0 {
+		user.zlog.Info().
+			Int("conversation_count", len(conversations)).
+			Msg("Probably received all history sync blobs, now backfilling conversations")
+		// Find the portals for all the conversations.
+		for i, conv := range conversations {
+			jid, err := types.ParseJID(conv.ConversationID)
+			if err != nil {
+				user.zlog.Warn().Err(err).
+					Str("conversation_id", conv.ConversationID).
+					Msg("Failed to parse chat JID in history sync")
+				continue
+			}
+			portal := user.GetPortalByJID(jid)
+			if portal.MXID != "" {
+				user.zlog.Debug().
+					Str("portal_jid", portal.Key.JID.String()).
+					Msg("Chat already has a room, deleting messages from database")
+				user.bridge.DB.HistorySync.DeleteAllMessagesForPortal(user.MXID, portal.Key)
+			} else if i < user.bridge.Config.Bridge.HistorySync.MaxInitialConversations {
+				err = portal.CreateMatrixRoom(user, nil, true, true)
+				if err != nil {
+					user.zlog.Err(err).Msg("Failed to create Matrix room for backfill")
+				}
+			}
+		}
+	}
+}
+
+func (portal *Portal) legacyBackfill(user *User) {
+	defer portal.latestEventBackfillLock.Unlock()
+	// This should only be called from CreateMatrixRoom which locks latestEventBackfillLock before creating the room.
+	if portal.latestEventBackfillLock.TryLock() {
+		panic("legacyBackfill() called without locking latestEventBackfillLock")
+	}
+	// TODO use portal.zlog instead of user.zlog
+	log := user.zlog.With().
+		Str("portal_jid", portal.Key.JID.String()).
+		Str("action", "legacy backfill").
+		Logger()
+	messages := user.bridge.DB.HistorySync.GetMessagesBetween(user.MXID, portal.Key.JID.String(), nil, nil, portal.bridge.Config.Bridge.HistorySync.MessageCount)
+	log.Debug().Int("message_count", len(messages)).Msg("Got messages to backfill from database")
+	for i := len(messages) - 1; i >= 0; i-- {
+		msgEvt, err := user.Client.ParseWebMessage(portal.Key.JID, messages[i])
+		if err != nil {
+			log.Warn().Err(err).
+				Int("msg_index", i).
+				Str("msg_id", messages[i].GetKey().GetId()).
+				Uint64("msg_time_seconds", messages[i].GetMessageTimestamp()).
+				Msg("Dropping historical message due to parse error")
+			continue
+		}
+		portal.handleMessage(user, msgEvt)
+	}
+	log.Debug().Msg("Backfill complete, deleting leftover messages from database")
+	user.bridge.DB.HistorySync.DeleteAllMessagesForPortal(user.MXID, portal.Key)
+}
+
 func (user *User) dailyMediaRequestLoop() {
 	// Calculate when to do the first set of media retry requests
 	now := time.Now()
@@ -358,12 +425,12 @@ func (user *User) shouldCreatePortalForHistorySync(conv *database.HistorySyncCon
 	}
 }
 
-func (user *User) handleHistorySync(backfillQueue *BackfillQueue, evt *waProto.HistorySync) {
+func (user *User) storeHistorySync(evt *waProto.HistorySync) {
 	if evt == nil || evt.SyncType == nil {
 		return
 	}
 	log := user.bridge.ZLog.With().
-		Str("method", "User.handleHistorySync").
+		Str("method", "User.storeHistorySync").
 		Str("user_id", user.MXID.String()).
 		Str("sync_type", evt.GetSyncType().String()).
 		Uint32("chunk_order", evt.GetChunkOrder()).

main.go

@@ -33,7 +33,6 @@ import (
 	"go.mau.fi/whatsmeow/store/sqlstore"
 	"go.mau.fi/whatsmeow/types"
 
-	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/bridge"
 	"maunium.net/go/mautrix/bridge/commands"
 	"maunium.net/go/mautrix/bridge/status"
@@ -248,20 +247,6 @@ func (br *WABridge) GetConfigPtr() interface{} {
 	return br.Config
 }
 
-const unstableFeatureBatchSending = "org.matrix.msc2716"
-
-func (br *WABridge) CheckFeatures(versions *mautrix.RespVersions) (string, bool) {
-	if br.Config.Bridge.HistorySync.Backfill {
-		supported, known := versions.UnstableFeatures[unstableFeatureBatchSending]
-		if !known {
-			return "Backfilling is enabled in bridge config, but homeserver does not support MSC2716 batch sending", false
-		} else if !supported {
-			return "Backfilling is enabled in bridge config, but MSC2716 batch sending is not enabled on homeserver", false
-		}
-	}
-	return "", true
-}
-
 func main() {
 	br := &WABridge{
 		usersByMXID:         make(map[id.UserID]*User),

portal.go

@@ -1697,6 +1697,16 @@ func (portal *Portal) CreateMatrixRoom(user *User, groupInfo *types.GroupInfo, i
 	if !portal.shouldSetDMRoomMetadata() {
 		req.Name = ""
 	}
+	legacyBackfill := user.bridge.Config.Bridge.HistorySync.Backfill && backfill && !user.bridge.SpecVersions.Supports(mautrix.BeeperFeatureBatchSending)
+	var backfillStarted bool
+	if legacyBackfill {
+		portal.latestEventBackfillLock.Lock()
+		defer func() {
+			if !backfillStarted {
+				portal.latestEventBackfillLock.Unlock()
+			}
+		}()
+	}
 	resp, err := intent.CreateRoom(req)
 	if err != nil {
 		return err
@@ -1758,11 +1768,16 @@ func (portal *Portal) CreateMatrixRoom(user *User, groupInfo *types.GroupInfo, i
 	}
 
 	if user.bridge.Config.Bridge.HistorySync.Backfill && backfill {
+		if legacyBackfill {
+			backfillStarted = true
+			go portal.legacyBackfill(user)
+		} else {
 			portals := []*Portal{portal}
 			user.EnqueueImmediateBackfills(portals)
 			user.EnqueueDeferredBackfills(portals)
 			user.BackfillQueue.ReCheck()
 		}
+	}
 	return nil
 }
 
@@ -4491,7 +4506,7 @@ func (portal *Portal) Cleanup(puppetsOnly bool) {
 		return
 	}
 	intent := portal.MainIntent()
-	if portal.bridge.SpecVersions.UnstableFeatures["com.beeper.room_yeeting"] {
+	if portal.bridge.SpecVersions.Supports(mautrix.BeeperFeatureRoomYeeting) {
 		err := intent.BeeperDeleteRoom(portal.MXID)
 		if err == nil || errors.Is(err, mautrix.MNotFound) {
 			return