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// Copyright 2017 Vector Creations Ltd
//
// 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 input contains the code processes new room events
package input
import (
"context"
"encoding/json"
"sync"
"github.com/Arceliar/phony"
"github.com/getsentry/sentry-go"
"github.com/matrix-org/dendrite/internal/hooks"
"github.com/matrix-org/dendrite/roomserver/acls"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/dendrite/roomserver/storage"
"github.com/matrix-org/dendrite/setup/jetstream"
"github.com/matrix-org/gomatrixserverlib"
"github.com/nats-io/nats.go"
"github.com/prometheus/client_golang/prometheus"
log "github.com/sirupsen/logrus"
"github.com/tidwall/gjson"
)
var keyContentFields = map[string]string{
"m.room.join_rules": "join_rule",
"m.room.history_visibility": "history_visibility",
"m.room.member": "membership",
}
type Inputer struct {
DB storage.Database
JetStream nats.JetStreamContext
Durable nats.SubOpt
ServerName gomatrixserverlib.ServerName
ACLs *acls.ServerACLs
InputRoomEventTopic string
OutputRoomEventTopic string
workers sync.Map // room ID -> *phony.Inbox
}
// onMessage is called when a new event arrives in the roomserver input stream.
func (r *Inputer) Start() error {
_, err := r.JetStream.Subscribe(
r.InputRoomEventTopic,
// We specifically don't use jetstream.WithJetStreamMessage here because we
// queue the task off to a room-specific queue and the ACK needs to be sent
// later, possibly with an error response to the inputter if synchronous.
func(msg *nats.Msg) {
roomID := msg.Header.Get("room_id")
var inputRoomEvent api.InputRoomEvent
if err := json.Unmarshal(msg.Data, &inputRoomEvent); err != nil {
_ = msg.Term()
return
}
inbox, _ := r.workers.LoadOrStore(roomID, &phony.Inbox{})
roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Inc()
inbox.(*phony.Inbox).Act(nil, func() {
defer roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Dec()
if err := r.processRoomEvent(context.TODO(), &inputRoomEvent); err != nil {
sentry.CaptureException(err)
} else {
hooks.Run(hooks.KindNewEventPersisted, inputRoomEvent.Event)
}
_ = msg.Ack()
})
},
// NATS wants to acknowledge automatically by default when the message is
// read from the stream, but we want to override that behaviour by making
// sure that we only acknowledge when we're happy we've done everything we
// can. This ensures we retry things when it makes sense to do so.
nats.ManualAck(),
// NATS will try to redeliver things to us automatically if we don't ack
// or nak them within a certain amount of time. This stops that from
// happening, so we don't end up doing a lot of unnecessary duplicate work.
nats.MaxDeliver(0),
// Use a durable named consumer.
r.Durable,
)
return err
}
// InputRoomEvents implements api.RoomserverInternalAPI
func (r *Inputer) InputRoomEvents(
ctx context.Context,
request *api.InputRoomEventsRequest,
response *api.InputRoomEventsResponse,
) {
if request.Asynchronous {
var err error
for _, e := range request.InputRoomEvents {
msg := &nats.Msg{
Subject: r.InputRoomEventTopic,
Header: nats.Header{},
}
roomID := e.Event.RoomID()
msg.Header.Set("room_id", roomID)
msg.Data, err = json.Marshal(e)
if err != nil {
response.ErrMsg = err.Error()
return
}
if _, err = r.JetStream.PublishMsg(msg); err != nil {
return
}
}
} else {
responses := make(chan error, len(request.InputRoomEvents))
defer close(responses)
for _, e := range request.InputRoomEvents {
inputRoomEvent := e
roomID := inputRoomEvent.Event.RoomID()
inbox, _ := r.workers.LoadOrStore(roomID, &phony.Inbox{})
roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Inc()
inbox.(*phony.Inbox).Act(nil, func() {
defer roomserverInputBackpressure.With(prometheus.Labels{"room_id": roomID}).Dec()
err := r.processRoomEvent(context.TODO(), &inputRoomEvent)
if err != nil {
sentry.CaptureException(err)
} else {
hooks.Run(hooks.KindNewEventPersisted, inputRoomEvent.Event)
}
select {
case <-ctx.Done():
default:
responses <- err
}
})
}
for i := 0; i < len(request.InputRoomEvents); i++ {
select {
case <-ctx.Done():
return
case err := <-responses:
if err != nil {
response.ErrMsg = err.Error()
return
}
}
}
}
}
// WriteOutputEvents implements OutputRoomEventWriter
func (r *Inputer) WriteOutputEvents(roomID string, updates []api.OutputEvent) error {
var err error
for _, update := range updates {
msg := &nats.Msg{
Subject: r.OutputRoomEventTopic,
Header: nats.Header{},
}
msg.Header.Set(jetstream.RoomID, roomID)
msg.Data, err = json.Marshal(update)
if err != nil {
return err
}
logger := log.WithFields(log.Fields{
"room_id": roomID,
"type": update.Type,
})
if update.NewRoomEvent != nil {
eventType := update.NewRoomEvent.Event.Type()
logger = logger.WithFields(log.Fields{
"event_type": eventType,
"event_id": update.NewRoomEvent.Event.EventID(),
"adds_state": len(update.NewRoomEvent.AddsStateEventIDs),
"removes_state": len(update.NewRoomEvent.RemovesStateEventIDs),
"send_as_server": update.NewRoomEvent.SendAsServer,
"sender": update.NewRoomEvent.Event.Sender(),
})
if update.NewRoomEvent.Event.StateKey() != nil {
logger = logger.WithField("state_key", *update.NewRoomEvent.Event.StateKey())
}
contentKey := keyContentFields[eventType]
if contentKey != "" {
value := gjson.GetBytes(update.NewRoomEvent.Event.Content(), contentKey)
if value.Exists() {
logger = logger.WithField("content_value", value.String())
}
}
if eventType == "m.room.server_acl" && update.NewRoomEvent.Event.StateKeyEquals("") {
ev := update.NewRoomEvent.Event.Unwrap()
defer r.ACLs.OnServerACLUpdate(ev)
}
}
logger.Tracef("Producing to topic '%s'", r.OutputRoomEventTopic)
if _, err := r.JetStream.PublishMsg(msg); err != nil {
logger.WithError(err).Errorf("Failed to produce to topic '%s': %s", r.OutputRoomEventTopic, err)
return err
}
}
return nil
}
func init() {
prometheus.MustRegister(roomserverInputBackpressure)
}
var roomserverInputBackpressure = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: "dendrite",
Subsystem: "roomserver",
Name: "input_backpressure",
Help: "How many events are queued for input for a given room",
},
[]string{"room_id"},
)
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