move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/updates/internal/e2e/server_event.go

@@ -0,0 +1,96 @@
+package e2e
+
+import (
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+// EventBuilder struct.
+type EventBuilder struct {
+	updates []tg.UpdateClass
+	ents    *Entities
+	s       *server
+	date    int
+}
+
+// SendMessage send a new message.
+func (e *EventBuilder) SendMessage(from *tg.PeerUser, peer tg.PeerClass, text string) {
+	msg := &tg.Message{
+		Message: text,
+		PeerID:  peer,
+		FromID:  from,
+		Date:    e.date,
+	}
+
+	fromUser, ok := e.s.peers.users[from.UserID]
+	if !ok {
+		panic("bad fromID")
+	}
+	e.ents.Users[from.UserID] = fromUser
+
+	switch peer := peer.(type) {
+	case *tg.PeerUser:
+		user, ok := e.s.peers.users[peer.UserID]
+		if !ok {
+			panic("peer not found")
+		}
+
+		e.ents.Users[user.ID] = user
+		e.s.messages.common = append(e.s.messages.common, msg)
+		e.updates = append(e.updates, &tg.UpdateNewMessage{
+			Message:  msg,
+			Pts:      len(e.s.messages.common),
+			PtsCount: 1,
+		})
+	case *tg.PeerChat:
+		chat, ok := e.s.peers.chats[peer.ChatID]
+		if !ok {
+			panic("peer not found")
+		}
+
+		e.ents.Chats[chat.ID] = chat
+		e.s.messages.common = append(e.s.messages.common, msg)
+		e.updates = append(e.updates, &tg.UpdateNewMessage{
+			Message:  msg,
+			Pts:      len(e.s.messages.common),
+			PtsCount: 1,
+		})
+	case *tg.PeerChannel:
+		channel, ok := e.s.peers.channels[peer.ChannelID]
+		if !ok {
+			panic("peer not found")
+		}
+
+		e.ents.Channels[channel.ID] = channel
+		msgs := append(e.s.messages.channels[peer.ChannelID], msg)
+		e.s.messages.channels[peer.ChannelID] = msgs
+		e.updates = append(e.updates, &tg.UpdateNewChannelMessage{
+			Message:  msg,
+			Pts:      len(msgs),
+			PtsCount: 1,
+		})
+	default:
+		panic("unexpected peer type")
+	}
+}
+
+// CreateEvent creates new event.
+func (s *server) CreateEvent(f func(ev *EventBuilder)) *tg.Updates {
+	s.mux.Lock()
+	defer s.mux.Unlock()
+
+	s.date++
+	ev := &EventBuilder{
+		ents: NewEntities(),
+		s:    s,
+		date: s.date,
+	}
+	f(ev)
+
+	return &tg.Updates{
+		Updates: ev.updates,
+		Users:   ev.ents.AsUsers(),
+		Chats:   ev.ents.AsChats(),
+		Date:    s.date,
+		Seq:     0,
+	}
+}