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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/clientapi/auth/storage/accounts"
"github.com/matrix-org/dendrite/common"
"github.com/matrix-org/dendrite/common/config"
"github.com/matrix-org/dendrite/roomserver/api"
"github.com/matrix-org/gomatrixserverlib"
log "github.com/sirupsen/logrus"
sarama "gopkg.in/Shopify/sarama.v1"
)
// OutputRoomEventConsumer consumes events that originated in the room server.
type OutputRoomEventConsumer struct {
roomServerConsumer *common.ContinualConsumer
db accounts.Database
asDB storage.Database
query api.RoomserverQueryAPI
alias api.RoomserverAliasAPI
serverName string
workerStates []types.ApplicationServiceWorkerState
}
// NewOutputRoomEventConsumer creates a new OutputRoomEventConsumer. Call
// Start() to begin consuming from room servers.
func NewOutputRoomEventConsumer(
cfg *config.Dendrite,
kafkaConsumer sarama.Consumer,
store accounts.Database,
appserviceDB storage.Database,
queryAPI api.RoomserverQueryAPI,
aliasAPI api.RoomserverAliasAPI,
workerStates []types.ApplicationServiceWorkerState,
) *OutputRoomEventConsumer {
consumer := common.ContinualConsumer{
Topic: string(cfg.Kafka.Topics.OutputRoomEvent),
Consumer: kafkaConsumer,
PartitionStore: store,
}
s := &OutputRoomEventConsumer{
roomServerConsumer: &consumer,
db: store,
asDB: appserviceDB,
query: queryAPI,
alias: aliasAPI,
serverName: string(cfg.Matrix.ServerName),
workerStates: workerStates,
}
consumer.ProcessMessage = s.onMessage
return s
}
// Start consuming from room servers
func (s *OutputRoomEventConsumer) Start() error {
return s.roomServerConsumer.Start()
}
// onMessage is called when the appservice component receives a new event from
// the room server output log.
func (s *OutputRoomEventConsumer) onMessage(msg *sarama.ConsumerMessage) error {
// Parse out the event JSON
var output api.OutputEvent
if err := json.Unmarshal(msg.Value, &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 nil
}
if output.Type != api.OutputTypeNewRoomEvent {
log.WithField("type", output.Type).Debug(
"roomserver output log: ignoring unknown output type",
)
return nil
}
ev := output.NewRoomEvent.Event
log.WithFields(log.Fields{
"event_id": ev.EventID(),
"room_id": ev.RoomID(),
"type": ev.Type(),
}).Info("appservice received an event from roomserver")
missingEvents, err := s.lookupMissingStateEvents(output.NewRoomEvent.AddsStateEventIDs, ev.Event)
if err != nil {
return err
}
events := append(missingEvents, ev.Event)
// Send event to any relevant application services
return s.filterRoomserverEvents(context.TODO(), events)
}
// lookupMissingStateEvents looks up the state events that are added by a new event,
// and returns any not already present.
func (s *OutputRoomEventConsumer) lookupMissingStateEvents(
addsStateEventIDs []string, event gomatrixserverlib.Event,
) ([]gomatrixserverlib.Event, error) {
// Fast path if there aren't any new state events.
if len(addsStateEventIDs) == 0 {
return []gomatrixserverlib.Event{}, nil
}
// Fast path if the only state event added is the event itself.
if len(addsStateEventIDs) == 1 && addsStateEventIDs[0] == event.EventID() {
return []gomatrixserverlib.Event{}, nil
}
result := []gomatrixserverlib.Event{}
missing := []string{}
for _, id := range addsStateEventIDs {
if id != event.EventID() {
// If the event isn't the current one, add it to the list of events
// to retrieve from the roomserver
missing = append(missing, id)
}
}
// Request the missing events from the roomserver
eventReq := api.QueryEventsByIDRequest{EventIDs: missing}
var eventResp api.QueryEventsByIDResponse
if err := s.query.QueryEventsByID(context.TODO(), &eventReq, &eventResp); err != nil {
return nil, err
}
for _, headeredEvent := range eventResp.Events {
result = append(result, headeredEvent.Event)
}
return result, nil
}
// 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.Event,
) 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")
} 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
}
// appserviceIsInterestedInEvent returns a boolean depending on whether a given
// event falls within one of a given application service's namespaces.
func (s *OutputRoomEventConsumer) appserviceIsInterestedInEvent(ctx context.Context, event gomatrixserverlib.Event, 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
}
// 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.alias.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")
}
return false
}
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