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/mtproto/ack.go

@@ -0,0 +1,46 @@
+package mtproto
+
+import (
+	"context"
+
+	"github.com/go-faster/errors"
+	"go.uber.org/zap"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/mt"
+)
+
+func (c *Conn) ackLoop(ctx context.Context) error {
+	log := c.log.Named("ack")
+
+	var buf []int64
+	send := func() {
+		defer func() { buf = buf[:0] }()
+
+		if err := c.writeServiceMessage(ctx, &mt.MsgsAck{MsgIDs: buf}); err != nil {
+			c.log.Error("Failed to ACK", zap.Error(err))
+			return
+		}
+
+		log.Debug("Ack", zap.Int64s("msg_ids", buf))
+	}
+
+	ticker := c.clock.Ticker(c.ackInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return errors.Wrap(ctx.Err(), "acl")
+		case <-ticker.C():
+			if len(buf) > 0 {
+				send()
+			}
+		case msgID := <-c.ackSendChan:
+			buf = append(buf, msgID)
+			if len(buf) >= c.ackBatchSize {
+				send()
+				ticker.Reset(c.ackInterval)
+			}
+		}
+	}
+}