mirror of
https://github.com/matrix-org/dendrite.git
synced 2024-11-26 16:21:55 -06:00
218 lines
7 KiB
Go
218 lines
7 KiB
Go
// Copyright 2017 Vector Creations Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package input contains the code processes new room events
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package input
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import (
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"context"
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"encoding/json"
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"sync"
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"github.com/Arceliar/phony"
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"github.com/getsentry/sentry-go"
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"github.com/matrix-org/dendrite/internal/hooks"
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"github.com/matrix-org/dendrite/roomserver/acls"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/roomserver/storage"
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"github.com/matrix-org/dendrite/setup/jetstream"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/nats-io/nats.go"
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"github.com/prometheus/client_golang/prometheus"
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log "github.com/sirupsen/logrus"
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"github.com/tidwall/gjson"
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)
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var keyContentFields = map[string]string{
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"m.room.join_rules": "join_rule",
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"m.room.history_visibility": "history_visibility",
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"m.room.member": "membership",
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}
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type Inputer struct {
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DB storage.Database
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JetStream nats.JetStreamContext
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ServerName gomatrixserverlib.ServerName
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ACLs *acls.ServerACLs
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InputRoomEventTopic string
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OutputRoomEventTopic string
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workers sync.Map // room ID -> *phony.Inbox
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}
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// onMessage is called when a new event arrives in the roomserver input stream.
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func (r *Inputer) Start() error {
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_, err := r.JetStream.Subscribe(
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r.InputRoomEventTopic,
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// We specifically don't use jetstream.WithJetStreamMessage here because we
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// queue the task off to a room-specific queue and the ACK needs to be sent
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// later, possibly with an error response to the inputter if synchronous.
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func(msg *nats.Msg) {
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roomID := msg.Header.Get("room_id")
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var inputRoomEvent api.InputRoomEvent
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if err := json.Unmarshal(msg.Data, &inputRoomEvent); err != nil {
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_ = msg.Term()
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return
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}
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inbox, _ := r.workers.LoadOrStore(roomID, &phony.Inbox{})
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roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Inc()
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inbox.(*phony.Inbox).Act(nil, func() {
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defer roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Dec()
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if err := r.processRoomEvent(context.TODO(), &inputRoomEvent); err != nil {
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sentry.CaptureException(err)
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} else {
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hooks.Run(hooks.KindNewEventPersisted, inputRoomEvent.Event)
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}
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_ = msg.Ack()
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})
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},
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// NATS wants to acknowledge automatically by default when the message is
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// read from the stream, but we want to override that behaviour by making
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// sure that we only acknowledge when we're happy we've done everything we
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// can. This ensures we retry things when it makes sense to do so.
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nats.ManualAck(),
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// NATS will try to redeliver things to us automatically if we don't ack
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// or nak them within a certain amount of time. This stops that from
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// happening, so we don't end up doing a lot of unnecessary duplicate work.
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nats.MaxDeliver(0),
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)
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return err
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}
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// InputRoomEvents implements api.RoomserverInternalAPI
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func (r *Inputer) InputRoomEvents(
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ctx context.Context,
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request *api.InputRoomEventsRequest,
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response *api.InputRoomEventsResponse,
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) {
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if request.Asynchronous {
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var err error
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for _, e := range request.InputRoomEvents {
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msg := &nats.Msg{
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Subject: r.InputRoomEventTopic,
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Header: nats.Header{},
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}
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roomID := e.Event.RoomID()
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msg.Header.Set("room_id", roomID)
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msg.Data, err = json.Marshal(e)
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if err != nil {
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response.ErrMsg = err.Error()
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return
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}
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if _, err = r.JetStream.PublishMsg(msg); err != nil {
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return
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}
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}
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} else {
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responses := make(chan error, len(request.InputRoomEvents))
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defer close(responses)
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for _, e := range request.InputRoomEvents {
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inputRoomEvent := e
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roomID := inputRoomEvent.Event.RoomID()
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inbox, _ := r.workers.LoadOrStore(roomID, &phony.Inbox{})
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roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Inc()
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inbox.(*phony.Inbox).Act(nil, func() {
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defer roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Dec()
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err := r.processRoomEvent(context.TODO(), &inputRoomEvent)
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if err != nil {
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sentry.CaptureException(err)
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} else {
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hooks.Run(hooks.KindNewEventPersisted, inputRoomEvent.Event)
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}
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select {
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case <-ctx.Done():
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default:
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responses <- err
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}
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})
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}
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for i := 0; i < len(request.InputRoomEvents); i++ {
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select {
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case <-ctx.Done():
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return
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case err := <-responses:
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if err != nil {
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response.ErrMsg = err.Error()
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return
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}
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}
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}
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}
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}
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// WriteOutputEvents implements OutputRoomEventWriter
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func (r *Inputer) WriteOutputEvents(roomID string, updates []api.OutputEvent) error {
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var err error
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for _, update := range updates {
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msg := &nats.Msg{
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Subject: r.OutputRoomEventTopic,
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Header: nats.Header{},
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}
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msg.Header.Set(jetstream.RoomID, roomID)
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msg.Data, err = json.Marshal(update)
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if err != nil {
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return err
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}
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logger := log.WithFields(log.Fields{
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"room_id": roomID,
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"type": update.Type,
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})
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if update.NewRoomEvent != nil {
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eventType := update.NewRoomEvent.Event.Type()
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logger = logger.WithFields(log.Fields{
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"event_type": eventType,
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"event_id": update.NewRoomEvent.Event.EventID(),
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"adds_state": len(update.NewRoomEvent.AddsStateEventIDs),
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"removes_state": len(update.NewRoomEvent.RemovesStateEventIDs),
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"send_as_server": update.NewRoomEvent.SendAsServer,
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"sender": update.NewRoomEvent.Event.Sender(),
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})
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if update.NewRoomEvent.Event.StateKey() != nil {
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logger = logger.WithField("state_key", *update.NewRoomEvent.Event.StateKey())
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}
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contentKey := keyContentFields[eventType]
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if contentKey != "" {
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value := gjson.GetBytes(update.NewRoomEvent.Event.Content(), contentKey)
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if value.Exists() {
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logger = logger.WithField("content_value", value.String())
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}
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}
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if eventType == "m.room.server_acl" && update.NewRoomEvent.Event.StateKeyEquals("") {
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ev := update.NewRoomEvent.Event.Unwrap()
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defer r.ACLs.OnServerACLUpdate(ev)
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}
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}
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logger.Tracef("Producing to topic '%s'", r.OutputRoomEventTopic)
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if _, err := r.JetStream.PublishMsg(msg); err != nil {
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logger.WithError(err).Errorf("Failed to produce to topic '%s': %s", r.OutputRoomEventTopic, err)
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return err
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}
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}
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return nil
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}
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func init() {
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prometheus.MustRegister(roomserverInputBackpressure)
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}
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var roomserverInputBackpressure = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: "dendrite",
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Subsystem: "roomserver",
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Name: "input_backpressure",
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Help: "How many events are queued for input for a given room",
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},
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[]string{"room_id"},
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)
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