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/sequence_box_test.go

@@ -0,0 +1,168 @@
+package updates
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+)
+
+func TestSequenceBox(t *testing.T) {
+	var (
+		state   int
+		updates []update
+	)
+
+	ctx := context.Background()
+	box := newSequenceBox(sequenceConfig{
+		InitialState: 3,
+		Apply: func(ctx context.Context, s int, u []update) error {
+			state = s
+			updates = append(updates, u...)
+			return nil
+		},
+		Logger: zaptest.NewLogger(t),
+	})
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 1,
+		State: 2,
+		Count: 1,
+	}))
+	require.Zero(t, state)
+	require.Empty(t, updates)
+	require.Empty(t, box.pending)
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 1,
+		State: 3,
+		Count: 1,
+	}))
+	require.Zero(t, state)
+	require.Empty(t, updates)
+	require.Empty(t, box.pending)
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 1,
+		State: 4,
+		Count: 1,
+	}))
+	require.Equal(t, 4, state)
+	require.Equal(t, []update{{Value: 1, State: 4, Count: 1}}, updates)
+	require.Empty(t, box.pending)
+	updates = nil
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 1,
+		State: 6,
+		Count: 1,
+	}))
+	require.Equal(t, 4, state)
+	require.Empty(t, updates)
+	require.Equal(t, []update{{Value: 1, State: 6, Count: 1}}, box.pending)
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 2,
+		State: 5,
+		Count: 1,
+	}))
+	require.Equal(t, 6, state)
+	require.Equal(t, []update{{Value: 2, State: 5, Count: 1}, {Value: 1, State: 6, Count: 1}}, updates)
+	require.Empty(t, box.pending)
+	updates = nil
+
+	require.Nil(t, box.Handle(ctx, update{
+		Value: 3,
+		State: 8,
+		Count: 1,
+	}))
+	require.Equal(t, 6, state)
+	require.Empty(t, updates)
+	require.Equal(t, []update{{Value: 3, State: 8, Count: 1}}, box.pending)
+	<-box.gapTimeout.C
+
+	require.Equal(t, []gap{{from: 6, to: 7}}, box.gaps.gaps)
+	box.gaps.Clear()
+	require.False(t, box.gaps.Has())
+}
+
+func TestSequenceBoxApplyPending(t *testing.T) {
+	tests := []struct {
+		InitialState int
+		Pending      []update
+		PendingAfter []update
+		Applied      []update
+	}{
+		{
+			InitialState: 5,
+			Pending: []update{
+				{Value: 1, State: 3, Count: 1},
+				{Value: 1, State: 4, Count: 1},
+				{Value: 1, State: 1, Count: 1},
+			},
+			PendingAfter: []update{},
+			Applied:      []update{},
+		},
+		{
+			InitialState: 5,
+			Pending: []update{
+				{Value: 1, State: 3, Count: 1},
+				{Value: 1, State: 8, Count: 1},
+				{Value: 1, State: 7, Count: 1},
+				{Value: 1, State: 4, Count: 1},
+				{Value: 1, State: 1, Count: 1},
+			},
+			PendingAfter: []update{
+				{1, 7, 1, entities{}},
+				{1, 8, 1, entities{}},
+			},
+			Applied: []update{},
+		},
+		{
+			InitialState: 5,
+			Pending: []update{
+				{Value: 1, State: 8, Count: 1},
+				{Value: 1, State: 7, Count: 1},
+			},
+			PendingAfter: []update{
+				{1, 7, 1, entities{}},
+				{Value: 1, State: 8, Count: 1},
+			},
+			Applied: []update{},
+		},
+		{
+			InitialState: 5,
+			Pending: []update{
+				{Value: 1, State: 3, Count: 1},
+				{Value: 1, State: 6, Count: 1},
+				{Value: 1, State: 8, Count: 1},
+				{Value: 1, State: 4, Count: 1},
+				{Value: 1, State: 1, Count: 1},
+			},
+			PendingAfter: []update{
+				{Value: 1, State: 8, Count: 1},
+			},
+			Applied: []update{
+				{Value: 1, State: 6, Count: 1},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		applied := make([]update, 0)
+		box := newSequenceBox(sequenceConfig{
+			InitialState: test.InitialState,
+			Apply: func(_ context.Context, s int, u []update) error {
+				applied = append(applied, u...)
+				return nil
+			},
+			Logger: zaptest.NewLogger(t),
+		})
+
+		box.pending = test.Pending
+		require.NoError(t, box.applyPending(context.TODO()))
+		require.Equal(t, test.PendingAfter, box.pending)
+		require.Equal(t, test.Applied, applied)
+	}
+}