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// Copyright 2022 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"
"strconv"
"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/matrix-org/dendrite/userapi/api"
"github.com/matrix-org/gomatrixserverlib"
"github.com/nats-io/nats.go"
"github.com/sirupsen/logrus"
)
// OutputTypingEventConsumer consumes events that originated in the EDU server.
type PresenceConsumer struct {
ctx context.Context
jetstream nats.JetStreamContext
nats *nats.Conn
durable string
requestTopic string
presenceTopic string
db storage.Database
stream types.StreamProvider
notifier *notifier.Notifier
deviceAPI api.SyncUserAPI
cfg *config.SyncAPI
}
// NewPresenceConsumer creates a new PresenceConsumer.
// Call Start() to begin consuming events.
func NewPresenceConsumer(
process *process.ProcessContext,
cfg *config.SyncAPI,
js nats.JetStreamContext,
nats *nats.Conn,
db storage.Database,
notifier *notifier.Notifier,
stream types.StreamProvider,
deviceAPI api.SyncUserAPI,
) *PresenceConsumer {
return &PresenceConsumer{
ctx: process.Context(),
nats: nats,
jetstream: js,
durable: cfg.Matrix.JetStream.Durable("SyncAPIPresenceConsumer"),
presenceTopic: cfg.Matrix.JetStream.Prefixed(jetstream.OutputPresenceEvent),
requestTopic: cfg.Matrix.JetStream.Prefixed(jetstream.RequestPresence),
db: db,
notifier: notifier,
stream: stream,
deviceAPI: deviceAPI,
cfg: cfg,
}
}
// Start consuming typing events.
func (s *PresenceConsumer) Start() error {
// Normal NATS subscription, used by Request/Reply
_, err := s.nats.Subscribe(s.requestTopic, func(msg *nats.Msg) {
userID := msg.Header.Get(jetstream.UserID)
presence, err := s.db.GetPresence(context.Background(), userID)
m := &nats.Msg{
Header: nats.Header{},
}
if err != nil {
m.Header.Set("error", err.Error())
if err = msg.RespondMsg(m); err != nil {
logrus.WithError(err).Error("Unable to respond to messages")
}
return
}
if presence == nil {
presence = &types.PresenceInternal{
UserID: userID,
}
}
deviceRes := api.QueryDevicesResponse{}
if err = s.deviceAPI.QueryDevices(s.ctx, &api.QueryDevicesRequest{UserID: userID}, &deviceRes); err != nil {
m.Header.Set("error", err.Error())
if err = msg.RespondMsg(m); err != nil {
logrus.WithError(err).Error("Unable to respond to messages")
}
return
}
for i := range deviceRes.Devices {
if int64(presence.LastActiveTS) < deviceRes.Devices[i].LastSeenTS {
presence.LastActiveTS = gomatrixserverlib.Timestamp(deviceRes.Devices[i].LastSeenTS)
}
}
m.Header.Set(jetstream.UserID, presence.UserID)
m.Header.Set("presence", presence.ClientFields.Presence)
if presence.ClientFields.StatusMsg != nil {
m.Header.Set("status_msg", *presence.ClientFields.StatusMsg)
}
m.Header.Set("last_active_ts", strconv.Itoa(int(presence.LastActiveTS)))
if err = msg.RespondMsg(m); err != nil {
logrus.WithError(err).Error("Unable to respond to messages")
return
}
})
if err != nil {
return err
}
if !s.cfg.Matrix.Presence.EnableInbound && !s.cfg.Matrix.Presence.EnableOutbound {
return nil
}
return jetstream.JetStreamConsumer(
s.ctx, s.jetstream, s.presenceTopic, s.durable, s.onMessage,
nats.DeliverAll(), nats.ManualAck(), nats.HeadersOnly(),
)
}
func (s *PresenceConsumer) onMessage(ctx context.Context, msg *nats.Msg) bool {
userID := msg.Header.Get(jetstream.UserID)
presence := msg.Header.Get("presence")
timestamp := msg.Header.Get("last_active_ts")
fromSync, _ := strconv.ParseBool(msg.Header.Get("from_sync"))
logrus.Debugf("syncAPI received presence event: %+v", msg.Header)
ts, err := strconv.Atoi(timestamp)
if err != nil {
return true
}
var statusMsg *string = nil
if data, ok := msg.Header["status_msg"]; ok && len(data) > 0 {
newMsg := msg.Header.Get("status_msg")
statusMsg = &newMsg
}
// OK is already checked, so no need to do it again
p, _ := types.PresenceFromString(presence)
pos, err := s.db.UpdatePresence(ctx, userID, p, statusMsg, gomatrixserverlib.Timestamp(ts), fromSync)
if err != nil {
return true
}
s.stream.Advance(pos)
s.notifier.OnNewPresence(types.StreamingToken{PresencePosition: pos}, userID)
return true
}
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