1 files changed, 126 insertions, 0 deletions
diff --git a/matrix/sync.go b/matrix/sync.go
new file mode 100644
index 0000000..ab5d047
--- /dev/null
+++ b/matrix/sync.go
@@ -0,0 +1,126 @@
+package matrix
+
+import (
+	"encoding/json"
+	"fmt"
+	"runtime/debug"
+	"time"
+
+	"maunium.net/go/gomatrix"
+	"maunium.net/go/gomuks/config"
+)
+
+// 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   *config.Session
+	listeners map[string][]gomatrix.OnEventListener // event type to listeners array
+}
+
+// NewGomuksSyncer returns an instantiated GomuksSyncer
+func NewGomuksSyncer(session *config.Session) *GomuksSyncer {
+	return &GomuksSyncer{
+		Session:   session,
+		listeners: make(map[string][]gomatrix.OnEventListener),
+	}
+}
+
+func (s *GomuksSyncer) ProcessResponse(res *gomatrix.RespSync, since string) (err error) {
+	if !s.shouldProcessResponse(res, since) {
+		return
+	}
+	// gdebug.Print("Processing sync response", since, res)
+
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("ProcessResponse panicked! userID=%s since=%s panic=%s\n%s", s.Session.MXID, since, r, debug.Stack())
+		}
+	}()
+
+	for _, event := range res.Presence.Events {
+		s.notifyListeners(event)
+	}
+	for roomID, roomData := range res.Rooms.Join {
+		room := s.Session.GetRoom(roomID)
+		for _, event := range roomData.State.Events {
+			event.RoomID = roomID
+			room.UpdateState(event)
+			s.notifyListeners(event)
+		}
+		for _, event := range roomData.Timeline.Events {
+			event.RoomID = roomID
+			s.notifyListeners(event)
+		}
+		for _, event := range roomData.Ephemeral.Events {
+			event.RoomID = roomID
+			s.notifyListeners(event)
+		}
+
+		if len(room.PrevBatch) == 0 {
+			room.PrevBatch = roomData.Timeline.PrevBatch
+		}
+	}
+	for roomID, roomData := range res.Rooms.Invite {
+		room := s.Session.GetRoom(roomID)
+		for _, event := range roomData.State.Events {
+			event.RoomID = roomID
+			room.UpdateState(event)
+			s.notifyListeners(event)
+		}
+	}
+	for roomID, roomData := range res.Rooms.Leave {
+		room := s.Session.GetRoom(roomID)
+		for _, event := range roomData.Timeline.Events {
+			if event.StateKey != nil {
+				event.RoomID = roomID
+				room.UpdateState(event)
+				s.notifyListeners(event)
+			}
+		}
+
+		if len(room.PrevBatch) == 0 {
+			room.PrevBatch = roomData.Timeline.PrevBatch
+		}
+	}
+	return
+}
+
+// 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 string, callback gomatrix.OnEventListener) {
+	_, exists := s.listeners[eventType]
+	if !exists {
+		s.listeners[eventType] = []gomatrix.OnEventListener{}
+	}
+	s.listeners[eventType] = append(s.listeners[eventType], callback)
+}
+
+// shouldProcessResponse returns true if the response should be processed. May modify the response to remove
+// stuff that shouldn't be processed.
+func (s *GomuksSyncer) shouldProcessResponse(resp *gomatrix.RespSync, since string) bool {
+	if since == "" {
+		return false
+	}
+	return true
+}
+
+func (s *GomuksSyncer) notifyListeners(event *gomatrix.Event) {
+	listeners, exists := s.listeners[event.Type]
+	if !exists {
+		return
+	}
+	for _, fn := range listeners {
+		fn(event)
+	}
+}
+
+// OnFailedSync always returns a 10 second wait period between failed /syncs, never a fatal error.
+func (s *GomuksSyncer) OnFailedSync(res *gomatrix.RespSync, err error) (time.Duration, error) {
+	return 10 * time.Second, nil
+}
+
+// GetFilterJSON returns a filter with a timeline limit of 50.
+func (s *GomuksSyncer) GetFilterJSON(userID string) json.RawMessage {
+	return json.RawMessage(`{"room":{"timeline":{"limit":50}}}`)
+}