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// gomuks - A terminal Matrix client written in Go.
// Copyright (C) 2019 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Based on https://github.com/matrix-org/mautrix/blob/master/sync.go
package matrix
import (
"encoding/json"
"time"
"maunium.net/go/mautrix"
"maunium.net/go/gomuks/debug"
"maunium.net/go/gomuks/matrix/rooms"
)
type SyncerSession interface {
GetRoom(id string) *rooms.Room
GetUserID() string
}
type EventSource int
const (
EventSourcePresence EventSource = 1 << iota
EventSourceJoin
EventSourceInvite
EventSourceLeave
EventSourceAccountData
EventSourceTimeline
EventSourceState
EventSourceEphemeral
)
type EventHandler func(source EventSource, event *mautrix.Event)
// GomuksSyncer is the default syncing implementation. You can either write your own syncer, or selectively
// replace parts of this default syncer (e.g. the ProcessResponse method). The default syncer uses the observer
// pattern to notify callers about incoming events. See GomuksSyncer.OnEventType for more information.
type GomuksSyncer struct {
Session SyncerSession
listeners map[mautrix.EventType][]EventHandler // event type to listeners array
FirstSyncDone bool
InitDoneCallback func()
}
// NewGomuksSyncer returns an instantiated GomuksSyncer
func NewGomuksSyncer(session SyncerSession) *GomuksSyncer {
return &GomuksSyncer{
Session: session,
listeners: make(map[mautrix.EventType][]EventHandler),
FirstSyncDone: false,
}
}
// ProcessResponse processes a Matrix sync response.
func (s *GomuksSyncer) ProcessResponse(res *mautrix.RespSync, since string) (err error) {
debug.Print("Received sync response")
s.processSyncEvents(nil, res.Presence.Events, EventSourcePresence, false)
s.processSyncEvents(nil, res.AccountData.Events, EventSourceAccountData, false)
for roomID, roomData := range res.Rooms.Join {
room := s.Session.GetRoom(roomID)
s.processSyncEvents(room, roomData.State.Events, EventSourceJoin|EventSourceState, false)
s.processSyncEvents(room, roomData.Timeline.Events, EventSourceJoin|EventSourceTimeline, false)
s.processSyncEvents(room, roomData.Ephemeral.Events, EventSourceJoin|EventSourceEphemeral, false)
s.processSyncEvents(room, roomData.AccountData.Events, EventSourceJoin|EventSourceAccountData, false)
if len(room.PrevBatch) == 0 {
room.PrevBatch = roomData.Timeline.PrevBatch
}
}
for roomID, roomData := range res.Rooms.Invite {
room := s.Session.GetRoom(roomID)
s.processSyncEvents(room, roomData.State.Events, EventSourceInvite|EventSourceState, false)
}
for roomID, roomData := range res.Rooms.Leave {
room := s.Session.GetRoom(roomID)
room.HasLeft = true
s.processSyncEvents(room, roomData.State.Events, EventSourceLeave|EventSourceState, true)
s.processSyncEvents(room, roomData.Timeline.Events, EventSourceLeave|EventSourceTimeline, false)
if len(room.PrevBatch) == 0 {
room.PrevBatch = roomData.Timeline.PrevBatch
}
}
if since == "" && s.InitDoneCallback != nil {
s.InitDoneCallback()
}
s.FirstSyncDone = true
return
}
func (s *GomuksSyncer) processSyncEvents(room *rooms.Room, events []*mautrix.Event, source EventSource, checkStateKey bool) {
for _, event := range events {
if !checkStateKey || event.StateKey != nil {
s.processSyncEvent(room, event, source)
}
}
}
func (s *GomuksSyncer) processSyncEvent(room *rooms.Room, event *mautrix.Event, source EventSource) {
if room != nil {
event.RoomID = room.ID
}
if event.Type.Class == mautrix.StateEventType {
room.UpdateState(event)
}
s.notifyListeners(source, event)
}
// OnEventType allows callers to be notified when there are new events for the given event type.
// There are no duplicate checks.
func (s *GomuksSyncer) OnEventType(eventType mautrix.EventType, callback EventHandler) {
_, exists := s.listeners[eventType]
if !exists {
s.listeners[eventType] = []EventHandler{}
}
s.listeners[eventType] = append(s.listeners[eventType], callback)
}
func (s *GomuksSyncer) notifyListeners(source EventSource, event *mautrix.Event) {
listeners, exists := s.listeners[event.Type]
if !exists {
return
}
for _, fn := range listeners {
fn(source, event)
}
}
// OnFailedSync always returns a 10 second wait period between failed /syncs, never a fatal error.
func (s *GomuksSyncer) OnFailedSync(res *mautrix.RespSync, err error) (time.Duration, error) {
debug.Printf("Sync failed: %v", err)
return 10 * time.Second, nil
}
// GetFilterJSON returns a filter with a timeline limit of 50.
func (s *GomuksSyncer) GetFilterJSON(userID string) json.RawMessage {
filter := &mautrix.Filter{
Room: mautrix.RoomFilter{
IncludeLeave: false,
State: mautrix.FilterPart{
Types: []string{
"m.room.member",
"m.room.name",
"m.room.topic",
"m.room.canonical_alias",
"m.room.aliases",
},
},
Timeline: mautrix.FilterPart{
Types: []string{
"m.room.message",
"m.room.member",
"m.room.name",
"m.room.topic",
"m.room.canonical_alias",
"m.room.aliases",
},
Limit: 50,
},
Ephemeral: mautrix.FilterPart{
Types: []string{"m.typing", "m.receipt"},
},
AccountData: mautrix.FilterPart{
Types: []string{"m.tag"},
},
},
AccountData: mautrix.FilterPart{
Types: []string{"m.push_rules", "m.direct", "net.maunium.gomuks.preferences"},
},
Presence: mautrix.FilterPart{
Types: []string{},
},
}
rawFilter, _ := json.Marshal(&filter)
return rawFilter
}
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