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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"
"time"
"github.com/Shopify/sarama"
"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/gomatrixserverlib"
log "github.com/sirupsen/logrus"
"go.uber.org/atomic"
)
type Inputer struct {
DB storage.Database
Producer sarama.SyncProducer
ServerName gomatrixserverlib.ServerName
ACLs *acls.ServerACLs
OutputRoomEventTopic string
workers sync.Map // room ID -> *inputWorker
}
type inputTask struct {
ctx context.Context
event *api.InputRoomEvent
wg *sync.WaitGroup
err error // written back by worker, only safe to read when all tasks are done
}
type inputWorker struct {
r *Inputer
running atomic.Bool
input chan *inputTask
}
func (w *inputWorker) start() {
if !w.running.CAS(false, true) {
return
}
defer w.running.Store(false)
for {
select {
case task := <-w.input:
hooks.Run(hooks.KindNewEventReceived, task.event.Event)
_, task.err = w.r.processRoomEvent(task.ctx, task.event)
if task.err == nil {
hooks.Run(hooks.KindNewEventPersisted, task.event.Event)
}
task.wg.Done()
case <-time.After(time.Second * 5):
return
}
}
}
// WriteOutputEvents implements OutputRoomEventWriter
func (r *Inputer) WriteOutputEvents(roomID string, updates []api.OutputEvent) error {
messages := make([]*sarama.ProducerMessage, len(updates))
for i := range updates {
value, err := json.Marshal(updates[i])
if err != nil {
return err
}
logger := log.WithFields(log.Fields{
"room_id": roomID,
"type": updates[i].Type,
})
if updates[i].NewRoomEvent != nil {
logger = logger.WithFields(log.Fields{
"event_type": updates[i].NewRoomEvent.Event.Type(),
"event_id": updates[i].NewRoomEvent.Event.EventID(),
"adds_state": len(updates[i].NewRoomEvent.AddsStateEventIDs),
"removes_state": len(updates[i].NewRoomEvent.RemovesStateEventIDs),
"send_as_server": updates[i].NewRoomEvent.SendAsServer,
"sender": updates[i].NewRoomEvent.Event.Sender(),
})
if updates[i].NewRoomEvent.Event.Type() == "m.room.server_acl" && updates[i].NewRoomEvent.Event.StateKeyEquals("") {
ev := updates[i].NewRoomEvent.Event.Unwrap()
defer r.ACLs.OnServerACLUpdate(ev)
}
}
logger.Infof("Producing to topic '%s'", r.OutputRoomEventTopic)
messages[i] = &sarama.ProducerMessage{
Topic: r.OutputRoomEventTopic,
Key: sarama.StringEncoder(roomID),
Value: sarama.ByteEncoder(value),
}
}
errs := r.Producer.SendMessages(messages)
if errs != nil {
for _, err := range errs.(sarama.ProducerErrors) {
log.WithError(err).WithField("message_bytes", err.Msg.Value.Length()).Error("Write to kafka failed")
}
}
return errs
}
// InputRoomEvents implements api.RoomserverInternalAPI
func (r *Inputer) InputRoomEvents(
ctx context.Context,
request *api.InputRoomEventsRequest,
response *api.InputRoomEventsResponse,
) {
// Create a wait group. Each task that we dispatch will call Done on
// this wait group so that we know when all of our events have been
// processed.
wg := &sync.WaitGroup{}
wg.Add(len(request.InputRoomEvents))
tasks := make([]*inputTask, len(request.InputRoomEvents))
for i, e := range request.InputRoomEvents {
// Work out if we are running per-room workers or if we're just doing
// it on a global basis (e.g. SQLite).
roomID := "global"
if r.DB.SupportsConcurrentRoomInputs() {
roomID = e.Event.RoomID()
}
// Look up the worker, or create it if it doesn't exist. This channel
// is buffered to reduce the chance that we'll be blocked by another
// room - the channel will be quite small as it's just pointer types.
w, _ := r.workers.LoadOrStore(roomID, &inputWorker{
r: r,
input: make(chan *inputTask, 10),
})
worker := w.(*inputWorker)
// Create a task. This contains the input event and a reference to
// the wait group, so that the worker can notify us when this specific
// task has been finished.
tasks[i] = &inputTask{
ctx: ctx,
event: &request.InputRoomEvents[i],
wg: wg,
}
// Send the task to the worker.
go worker.start()
worker.input <- tasks[i]
}
// Wait for all of the workers to return results about our tasks.
wg.Wait()
// If any of the tasks returned an error, we should probably report
// that back to the caller.
for _, task := range tasks {
if task.err != nil {
response.ErrMsg = task.err.Error()
_, rejected := task.err.(*gomatrixserverlib.NotAllowed)
response.NotAllowed = rejected
return
}
}
}
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