A test inside `channeldb/channel_test.go`

channel_test.go

func TestBatchUpdate(t *testing.T) {
	t.Parallel()

	fullDB, err := MakeTestDB(t, OptionStoreFinalHtlcResolutions(true))
	require.NoError(t, err, "unable to make test database")

	cdb := fullDB.ChannelStateDB()

	chanID := lnwire.ShortChannelID{
		BlockHeight: 1,
		TxIndex:     2,
		TxPosition:  3,
	}

	const (
		modulus = 10001
		num     = 100_000
	)

	var (
		counter atomic.Uint32
		numErr  atomic.Uint32
	)
	addHtlc := func(htlcID uint64) error {
		return kvdb.Batch(cdb.backend, func(tx kvdb.RwTx) error {

			counter.Add(1)

			bucket, err := fetchFinalHtlcsBucketRw(
				tx, chanID,
			)
			if err != nil {
				return err
			}

			if htlcID%modulus == 0 {
				numErr.Add(1)
				return fmt.Errorf("error from %d", htlcID)
			}

			return putFinalHtlc(bucket, htlcID, FinalHtlcInfo{
				Settled:  true,
				Offchain: true,
			})
		})
	}

	errChan := make(chan error, num)
	for i := uint64(0); i < num; i++ {
		go func(i uint64) {
			errChan <- addHtlc(i)
		}(i)
	}

	for i := uint64(0); i < num; i++ {
		select {
		case err := <-errChan:
			if err != nil {
				// t.Log(err)
			}
		}
	}

	for i := uint64(0); i < num; i++ {
		info, err := cdb.LookupFinalHtlc(chanID, i)

		if i%modulus == 0 {
			// Test unknown htlc lookup for existing channel.
			require.ErrorIs(t, err, ErrHtlcUnknown)
		} else {
			require.NoError(t, err)
			require.True(t, info.Settled)
			require.True(t, info.Offchain)
		}
	}

	t.Log("stats from NOT using updateErr")
	t.Log("total records:", num)
	t.Log("total errors:", num/modulus+1)
	t.Log("batch updates:", counter.Load())
	t.Log("updates with error:", numErr.Load())
}

func TestBatchUpdateErr(t *testing.T) {
	t.Parallel()

	fullDB, err := MakeTestDB(t, OptionStoreFinalHtlcResolutions(true))
	require.NoError(t, err, "unable to make test database")

	cdb := fullDB.ChannelStateDB()

	chanID := lnwire.ShortChannelID{
		BlockHeight: 1,
		TxIndex:     2,
		TxPosition:  3,
	}

	const (
		modulus = 10001
		num     = 100_000
	)

	var (
		counter atomic.Uint32
		numErr  atomic.Uint32
	)

	addHtlc := func(htlcID uint64) error {
		var updateErr error
		err := kvdb.Batch(cdb.backend, func(tx kvdb.RwTx) error {

			counter.Add(1)

			bucket, err := fetchFinalHtlcsBucketRw(
				tx, chanID,
			)
			if err != nil {
				return err
			}

			if htlcID%modulus == 0 {
				numErr.Add(1)
				updateErr = fmt.Errorf("error from %d", htlcID)
				return nil
			}

			return putFinalHtlc(bucket, htlcID, FinalHtlcInfo{
				Settled:  true,
				Offchain: true,
			})
		})

		if err != nil {
			return err
		}

		return updateErr
	}

	errChan := make(chan error, num)
	for i := uint64(0); i < num; i++ {
		go func(i uint64) {
			errChan <- addHtlc(i)
		}(i)
	}

	for i := uint64(0); i < num; i++ {
		select {
		case err := <-errChan:
			if err != nil {
				// t.Log(err)
			}
		}
	}

	for i := uint64(0); i < num; i++ {
		info, err := cdb.LookupFinalHtlc(chanID, i)

		if i%modulus == 0 {
			// Test unknown htlc lookup for existing channel.
			require.ErrorIs(t, err, ErrHtlcUnknown)
		} else {
			require.NoError(t, err)
			require.True(t, info.Settled)
			require.True(t, info.Offchain)
		}
	}

	t.Log("stats from using updateErr")
	t.Log("total records:", num)
	t.Log("total errors:", num/modulus+1)
	t.Log("batch updates:", counter.Load())
	t.Log("updates with error:", numErr.Load())
}

To run it,

1. copy the code into channeldb/channel_test.go.
2. cd channeldb.
3. run go test -v -run=TestBatchUpdate .

Test result,

=== RUN   TestBatchUpdate
=== PAUSE TestBatchUpdate
=== RUN   TestBatchUpdateErr
=== PAUSE TestBatchUpdateErr
=== CONT  TestBatchUpdate
=== CONT  TestBatchUpdateErr
    channel_test.go:1690: stats from using updateErr
    channel_test.go:1691: total records: 100000
    channel_test.go:1692: total errors: 10
    channel_test.go:1693: batch updates: 100000
    channel_test.go:1694: updates with error: 10
--- PASS: TestBatchUpdateErr (9.28s)
=== CONT  TestBatchUpdate
    channel_test.go:1598: stats from NOT using updateErr
    channel_test.go:1599: total records: 100000
    channel_test.go:1600: total errors: 10
    channel_test.go:1601: batch updates: 104537
    channel_test.go:1602: updates with error: 20
--- PASS: TestBatchUpdate (9.45s)
PASS