Remove eduserver (#2306)

* Move receipt sending to own JetStream producer

* Move SendToDevice to producer

* Remove most parts of the EDU server

* Fix SendToDevice & copyrights

* Move structs, cleanup EDU Server traces

* Use HeadersOnly subscription

* Missing file

* Fix linter issues

* Move consumers to own files

* Rename durable consumer; Consumer cleanup

* Docs/config cleanup

federationapi/consumers/typing.go

@@ -0,0 +1,119 @@
+// 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 consumers
+
+import (
+	"context"
+	"encoding/json"
+	"strconv"
+
+	"github.com/matrix-org/dendrite/federationapi/queue"
+	"github.com/matrix-org/dendrite/federationapi/storage"
+	"github.com/matrix-org/dendrite/setup/config"
+	"github.com/matrix-org/dendrite/setup/jetstream"
+	"github.com/matrix-org/dendrite/setup/process"
+	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/nats-io/nats.go"
+	log "github.com/sirupsen/logrus"
+)
+
+// OutputTypingConsumer consumes events that originate in the clientapi.
+type OutputTypingConsumer struct {
+	ctx        context.Context
+	jetstream  nats.JetStreamContext
+	durable    string
+	db         storage.Database
+	queues     *queue.OutgoingQueues
+	ServerName gomatrixserverlib.ServerName
+	topic      string
+}
+
+// NewOutputTypingConsumer creates a new OutputTypingConsumer. Call Start() to begin consuming typing events.
+func NewOutputTypingConsumer(
+	process *process.ProcessContext,
+	cfg *config.FederationAPI,
+	js nats.JetStreamContext,
+	queues *queue.OutgoingQueues,
+	store storage.Database,
+) *OutputTypingConsumer {
+	return &OutputTypingConsumer{
+		ctx:        process.Context(),
+		jetstream:  js,
+		queues:     queues,
+		db:         store,
+		ServerName: cfg.Matrix.ServerName,
+		durable:    cfg.Matrix.JetStream.Durable("FederationAPITypingConsumer"),
+		topic:      cfg.Matrix.JetStream.Prefixed(jetstream.OutputTypingEvent),
+	}
+}
+
+// Start consuming from the clientapi
+func (t *OutputTypingConsumer) Start() error {
+	return jetstream.JetStreamConsumer(
+		t.ctx, t.jetstream, t.topic, t.durable, t.onMessage,
+		nats.DeliverAll(), nats.ManualAck(), nats.HeadersOnly(),
+	)
+}
+
+// onMessage is called in response to a message received on the typing
+// events topic from the client api.
+func (t *OutputTypingConsumer) onMessage(ctx context.Context, msg *nats.Msg) bool {
+	// Extract the typing event from msg.
+	roomID := msg.Header.Get(jetstream.RoomID)
+	userID := msg.Header.Get(jetstream.UserID)
+	typing, err := strconv.ParseBool(msg.Header.Get("typing"))
+	if err != nil {
+		log.WithError(err).Errorf("EDU output log: typing parse failure")
+		return true
+	}
+
+	// only send typing events which originated from us
+	_, typingServerName, err := gomatrixserverlib.SplitID('@', userID)
+	if err != nil {
+		log.WithError(err).WithField("user_id", userID).Error("Failed to extract domain from typing sender")
+		_ = msg.Ack()
+		return true
+	}
+	if typingServerName != t.ServerName {
+		return true
+	}
+
+	joined, err := t.db.GetJoinedHosts(ctx, roomID)
+	if err != nil {
+		log.WithError(err).WithField("room_id", roomID).Error("failed to get joined hosts for room")
+		return false
+	}
+
+	names := make([]gomatrixserverlib.ServerName, len(joined))
+	for i := range joined {
+		names[i] = joined[i].ServerName
+	}
+
+	edu := &gomatrixserverlib.EDU{Type: "m.typing"}
+	if edu.Content, err = json.Marshal(map[string]interface{}{
+		"room_id": roomID,
+		"user_id": userID,
+		"typing":  typing,
+	}); err != nil {
+		log.WithError(err).Error("failed to marshal EDU JSON")
+		return true
+	}
+	if err := t.queues.SendEDU(edu, t.ServerName, names); err != nil {
+		log.WithError(err).Error("failed to send EDU")
+		return false
+	}
+
+	return true
+}