mirror of
https://github.com/matrix-org/dendrite
synced 2024-12-14 23:53:49 +01:00
200 lines
7 KiB
Go
200 lines
7 KiB
Go
// Copyright 2018 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 consumers
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import (
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"context"
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"encoding/json"
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"github.com/matrix-org/dendrite/appservice/storage"
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"github.com/matrix-org/dendrite/appservice/types"
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"github.com/matrix-org/dendrite/roomserver/api"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/dendrite/setup/jetstream"
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"github.com/matrix-org/dendrite/setup/process"
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"github.com/matrix-org/gomatrixserverlib"
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"github.com/nats-io/nats.go"
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log "github.com/sirupsen/logrus"
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)
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// OutputRoomEventConsumer consumes events that originated in the room server.
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type OutputRoomEventConsumer struct {
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jetstream nats.JetStreamContext
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topic string
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asDB storage.Database
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rsAPI api.RoomserverInternalAPI
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serverName string
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workerStates []types.ApplicationServiceWorkerState
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}
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// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call
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// Start() to begin consuming from room servers.
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func NewOutputRoomEventConsumer(
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process *process.ProcessContext,
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cfg *config.Dendrite,
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js nats.JetStreamContext,
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appserviceDB storage.Database,
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rsAPI api.RoomserverInternalAPI,
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workerStates []types.ApplicationServiceWorkerState,
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) *OutputRoomEventConsumer {
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return &OutputRoomEventConsumer{
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jetstream: js,
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topic: cfg.Global.JetStream.TopicFor(jetstream.OutputRoomEvent),
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asDB: appserviceDB,
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rsAPI: rsAPI,
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serverName: string(cfg.Global.ServerName),
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workerStates: workerStates,
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}
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}
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// Start consuming from room servers
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func (s *OutputRoomEventConsumer) Start() error {
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_, err := s.jetstream.Subscribe(s.topic, s.onMessage)
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return err
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}
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// onMessage is called when the appservice component receives a new event from
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// the room server output log.
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func (s *OutputRoomEventConsumer) onMessage(msg *nats.Msg) {
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// Parse out the event JSON
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var output api.OutputEvent
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if err := json.Unmarshal(msg.Data, &output); err != nil {
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// If the message was invalid, log it and move on to the next message in the stream
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log.WithError(err).Errorf("roomserver output log: message parse failure")
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_ = msg.Ack()
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return
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}
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if output.Type != api.OutputTypeNewRoomEvent {
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_ = msg.Ack()
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return
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}
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events := []*gomatrixserverlib.HeaderedEvent{output.NewRoomEvent.Event}
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events = append(events, output.NewRoomEvent.AddStateEvents...)
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// Send event to any relevant application services
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if err := s.filterRoomserverEvents(context.TODO(), events); err != nil {
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log.WithError(err).Errorf("roomserver output log: filter error")
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return
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}
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_ = msg.Ack()
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}
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// filterRoomserverEvents takes in events and decides whether any of them need
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// to be passed on to an external application service. It does this by checking
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// each namespace of each registered application service, and if there is a
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// match, adds the event to the queue for events to be sent to a particular
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// application service.
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func (s *OutputRoomEventConsumer) filterRoomserverEvents(
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ctx context.Context,
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events []*gomatrixserverlib.HeaderedEvent,
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) error {
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for _, ws := range s.workerStates {
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for _, event := range events {
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// Check if this event is interesting to this application service
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if s.appserviceIsInterestedInEvent(ctx, event, ws.AppService) {
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// Queue this event to be sent off to the application service
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if err := s.asDB.StoreEvent(ctx, ws.AppService.ID, event); err != nil {
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log.WithError(err).Warn("failed to insert incoming event into appservices database")
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return err
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} else {
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// Tell our worker to send out new messages by updating remaining message
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// count and waking them up with a broadcast
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ws.NotifyNewEvents()
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}
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}
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}
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}
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return nil
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}
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// appserviceJoinedAtEvent returns a boolean depending on whether a given
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// appservice has membership at the time a given event was created.
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func (s *OutputRoomEventConsumer) appserviceJoinedAtEvent(ctx context.Context, event *gomatrixserverlib.HeaderedEvent, appservice config.ApplicationService) bool {
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// TODO: This is only checking the current room state, not the state at
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// the event in question. Pretty sure this is what Synapse does too, but
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// until we have a lighter way of checking the state before the event that
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// doesn't involve state res, then this is probably OK.
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membershipReq := &api.QueryMembershipsForRoomRequest{
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RoomID: event.RoomID(),
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JoinedOnly: true,
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}
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membershipRes := &api.QueryMembershipsForRoomResponse{}
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// XXX: This could potentially race if the state for the event is not known yet
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// e.g. the event came over federation but we do not have the full state persisted.
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if err := s.rsAPI.QueryMembershipsForRoom(ctx, membershipReq, membershipRes); err == nil {
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for _, ev := range membershipRes.JoinEvents {
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var membership gomatrixserverlib.MemberContent
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if err = json.Unmarshal(ev.Content, &membership); err != nil || ev.StateKey == nil {
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continue
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}
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if appservice.IsInterestedInUserID(*ev.StateKey) {
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return true
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}
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}
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} else {
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log.WithFields(log.Fields{
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"room_id": event.RoomID(),
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}).WithError(err).Errorf("Unable to get membership for room")
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}
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return false
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}
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// appserviceIsInterestedInEvent returns a boolean depending on whether a given
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// event falls within one of a given application service's namespaces.
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//
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// TODO: This should be cached, see https://github.com/matrix-org/dendrite/issues/1682
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func (s *OutputRoomEventConsumer) appserviceIsInterestedInEvent(ctx context.Context, event *gomatrixserverlib.HeaderedEvent, appservice config.ApplicationService) bool {
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// No reason to queue events if they'll never be sent to the application
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// service
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if appservice.URL == "" {
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return false
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}
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// Check Room ID and Sender of the event
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if appservice.IsInterestedInUserID(event.Sender()) ||
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appservice.IsInterestedInRoomID(event.RoomID()) {
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return true
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}
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if event.Type() == gomatrixserverlib.MRoomMember && event.StateKey() != nil {
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if appservice.IsInterestedInUserID(*event.StateKey()) {
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return true
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}
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}
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// Check all known room aliases of the room the event came from
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queryReq := api.GetAliasesForRoomIDRequest{RoomID: event.RoomID()}
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var queryRes api.GetAliasesForRoomIDResponse
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if err := s.rsAPI.GetAliasesForRoomID(ctx, &queryReq, &queryRes); err == nil {
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for _, alias := range queryRes.Aliases {
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if appservice.IsInterestedInRoomAlias(alias) {
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return true
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}
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}
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} else {
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log.WithFields(log.Fields{
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"room_id": event.RoomID(),
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}).WithError(err).Errorf("Unable to get aliases for room")
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}
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// Check if any of the members in the room match the appservice
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return s.appserviceJoinedAtEvent(ctx, event, appservice)
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}
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