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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// 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/getsentry/sentry-go"
"github.com/matrix-org/dendrite/eduserver/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/dendrite/syncapi/notifier"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/types"
"github.com/nats-io/nats.go"
log "github.com/sirupsen/logrus"
)
// OutputReceiptEventConsumer consumes events that originated in the EDU server.
type OutputReceiptEventConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
durable nats.SubOpt
topic string
db storage.Database
stream types.StreamProvider
notifier *notifier.Notifier
}
// NewOutputReceiptEventConsumer creates a new OutputReceiptEventConsumer.
// Call Start() to begin consuming from the EDU server.
func NewOutputReceiptEventConsumer(
process *process.ProcessContext,
cfg *config.SyncAPI,
js nats.JetStreamContext,
store storage.Database,
notifier *notifier.Notifier,
stream types.StreamProvider,
) *OutputReceiptEventConsumer {
return &OutputReceiptEventConsumer{
ctx: process.Context(),
jetstream: js,
topic: cfg.Matrix.JetStream.TopicFor(jetstream.OutputReceiptEvent),
durable: cfg.Matrix.JetStream.Durable("SyncAPIEDUServerReceiptConsumer"),
db: store,
notifier: notifier,
stream: stream,
}
}
// Start consuming from EDU api
func (s *OutputReceiptEventConsumer) Start() error {
_, err := s.jetstream.Subscribe(s.topic, s.onMessage, s.durable)
return err
}
func (s *OutputReceiptEventConsumer) onMessage(msg *nats.Msg) {
jetstream.WithJetStreamMessage(msg, func(msg *nats.Msg) bool {
var output api.OutputReceiptEvent
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("EDU server output log: message parse failure")
sentry.CaptureException(err)
return true
}
streamPos, err := s.db.StoreReceipt(
s.ctx,
output.RoomID,
output.Type,
output.UserID,
output.EventID,
output.Timestamp,
)
if err != nil {
sentry.CaptureException(err)
return true
}
s.stream.Advance(streamPos)
s.notifier.OnNewReceipt(output.RoomID, types.StreamingToken{ReceiptPosition: streamPos})
return true
})
}
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