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