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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 streams
import (
"context"
"encoding/json"
"sync"
"github.com/matrix-org/gomatrixserverlib"
"github.com/tidwall/gjson"
"github.com/matrix-org/dendrite/syncapi/notifier"
"github.com/matrix-org/dendrite/syncapi/storage"
"github.com/matrix-org/dendrite/syncapi/types"
)
type PresenceStreamProvider struct {
DefaultStreamProvider
// cache contains previously sent presence updates to avoid unneeded updates
cache sync.Map
notifier *notifier.Notifier
}
func (p *PresenceStreamProvider) Setup(
ctx context.Context, snapshot storage.DatabaseTransaction,
) {
p.DefaultStreamProvider.Setup(ctx, snapshot)
p.latestMutex.Lock()
defer p.latestMutex.Unlock()
id, err := snapshot.MaxStreamPositionForPresence(ctx)
if err != nil {
panic(err)
}
p.latest = id
}
func (p *PresenceStreamProvider) CompleteSync(
ctx context.Context,
snapshot storage.DatabaseTransaction,
req *types.SyncRequest,
) types.StreamPosition {
return p.IncrementalSync(ctx, snapshot, req, 0, p.LatestPosition(ctx))
}
func (p *PresenceStreamProvider) IncrementalSync(
ctx context.Context,
snapshot storage.DatabaseTransaction,
req *types.SyncRequest,
from, to types.StreamPosition,
) types.StreamPosition {
// We pull out a larger number than the filter asks for, since we're filtering out events later
presences, err := snapshot.PresenceAfter(ctx, from, gomatrixserverlib.EventFilter{Limit: 1000})
if err != nil {
req.Log.WithError(err).Error("p.DB.PresenceAfter failed")
_ = snapshot.Rollback()
return from
}
if len(presences) == 0 {
return to
}
// add newly joined rooms user presences
newlyJoined := joinedRooms(req.Response, req.Device.UserID)
if len(newlyJoined) > 0 {
// TODO: Check if this is working better than before.
if err = p.notifier.LoadRooms(ctx, p.DB, newlyJoined); err != nil {
req.Log.WithError(err).Error("unable to refresh notifier lists")
return from
}
NewlyJoinedLoop:
for _, roomID := range newlyJoined {
roomUsers := p.notifier.JoinedUsers(roomID)
for i := range roomUsers {
// we already got a presence from this user
if _, ok := presences[roomUsers[i]]; ok {
continue
}
// Bear in mind that this might return nil, but at least populating
// a nil means that there's a map entry so we won't repeat this call.
presences[roomUsers[i]], err = snapshot.GetPresence(ctx, roomUsers[i])
if err != nil {
req.Log.WithError(err).Error("unable to query presence for user")
_ = snapshot.Rollback()
return from
}
if len(presences) > req.Filter.Presence.Limit {
break NewlyJoinedLoop
}
}
}
}
lastPos := from
for _, presence := range presences {
if presence == nil {
continue
}
// Ignore users we don't share a room with
if req.Device.UserID != presence.UserID && !p.notifier.IsSharedUser(req.Device.UserID, presence.UserID) {
continue
}
cacheKey := req.Device.UserID + req.Device.ID + presence.UserID
pres, ok := p.cache.Load(cacheKey)
if ok {
// skip already sent presence
prevPresence := pres.(*types.PresenceInternal)
currentlyActive := prevPresence.CurrentlyActive()
skip := prevPresence.Equals(presence) && currentlyActive && req.Device.UserID != presence.UserID
if skip {
req.Log.Tracef("Skipping presence, no change (%s)", presence.UserID)
continue
}
}
if _, known := types.PresenceFromString(presence.ClientFields.Presence); known {
presence.ClientFields.LastActiveAgo = presence.LastActiveAgo()
if presence.ClientFields.Presence == "online" {
currentlyActive := presence.CurrentlyActive()
presence.ClientFields.CurrentlyActive = ¤tlyActive
}
} else {
presence.ClientFields.Presence = "offline"
}
content, err := json.Marshal(presence.ClientFields)
if err != nil {
return from
}
req.Response.Presence.Events = append(req.Response.Presence.Events, gomatrixserverlib.ClientEvent{
Content: content,
Sender: presence.UserID,
Type: gomatrixserverlib.MPresence,
})
if presence.StreamPos > lastPos {
lastPos = presence.StreamPos
}
if len(req.Response.Presence.Events) == req.Filter.Presence.Limit {
break
}
p.cache.Store(cacheKey, presence)
}
if len(req.Response.Presence.Events) == 0 {
return to
}
return lastPos
}
func joinedRooms(res *types.Response, userID string) []string {
var roomIDs []string
for roomID, join := range res.Rooms.Join {
// we would expect to see our join event somewhere if we newly joined the room.
// Normal events get put in the join section so it's not enough to know the room ID is present in 'join'.
newlyJoined := membershipEventPresent(join.State.Events, userID)
if newlyJoined {
roomIDs = append(roomIDs, roomID)
continue
}
newlyJoined = membershipEventPresent(join.Timeline.Events, userID)
if newlyJoined {
roomIDs = append(roomIDs, roomID)
}
}
return roomIDs
}
func membershipEventPresent(events []gomatrixserverlib.ClientEvent, userID string) bool {
for _, ev := range events {
// it's enough to know that we have our member event here, don't need to check membership content
// as it's implied by being in the respective section of the sync response.
if ev.Type == gomatrixserverlib.MRoomMember && ev.StateKey != nil && *ev.StateKey == userID {
// ignore e.g. join -> join changes
if gjson.GetBytes(ev.Unsigned, "prev_content.membership").Str == gjson.GetBytes(ev.Content, "membership").Str {
continue
}
return true
}
}
return false
}
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