mirror of
https://github.com/lightningnetwork/lnd.git
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120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
package lnwire
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import (
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"bytes"
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"testing"
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"github.com/lightningnetwork/lnd/tlv"
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"github.com/stretchr/testify/require"
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)
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// TestChanUpdate2EncodeDecode tests the encoding and decoding of the
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// ChannelUpdate2 message using hardcoded byte slices.
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func TestChanUpdate2EncodeDecode(t *testing.T) {
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t.Parallel()
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// We'll create a raw byte stream that represents a valid ChannelUpdate2
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// message. This includes the signature and a TLV stream with both known
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// and unknown records.
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rawBytes := []byte{
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// ChainHash record (optional, not mainnet).
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0x0, // type.
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0x20, // length.
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0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1,
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0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1,
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0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1,
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// ShortChannelID record.
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0x2, // type.
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0x8, // length.
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0x0, 0x0, 0x1, 0x0, 0x0, 0x2, 0x0, 0x3, // value.
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// BlockHeight record.
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0x4, // type.
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0x4, // length.
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0x0, 0x0, 0x1, 0x0, // value.
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// DisabledFlags record.
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0x6, // type.
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0x1, // length.
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0x1, // value.
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// SecondPeer record.
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0x8, // type.
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0x0, // length.
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// Unknown odd-type TLV record.
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0x9, // type.
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0x2, // length.
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0xab, 0xcd, // value.
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// CLTVExpiryDelta record.
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0xa, // type.
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0x2, // length.
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0x0, 0x10, // value.
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// HTLCMinimumMsat record.
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0xc, // type.
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0x5, // length.
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0xfe, 0x0, 0xf, 0x42, 0x40, // value (BigSize: 1_000_000).
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// HTLCMaximumMsat record.
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0xe, // type.
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0x5, // length.
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0xfe, 0x0, 0xf, 0x42, 0x40, // value (BigSize: 1_000_000).
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// FeeBaseMsat record.
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0x10, // type.
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0x4, // length.
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0x0, 0x0, 0x1, 0x0, // value.
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// FeeProportionalMillionths record.
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0x12, // type.
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0x4, // length.
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0x0, 0x0, 0x1, 0x0, // value.
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// Extra Opaque Data - Unknown Record.
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0x14, // type.
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0x2, // length.
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0x79, 0x79, // value.
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// Signature.
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0xa0, // type.
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0x40, // length.
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0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb,
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0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
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0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a,
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0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34,
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0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e,
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0x3f, // value
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}
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secondSignedRangeType := new(bytes.Buffer)
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var buf [8]byte
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err := tlv.WriteVarInt(
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secondSignedRangeType, pureTLVSignedSecondRangeStart+1, &buf,
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)
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require.NoError(t, err)
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rawBytes = append(rawBytes, secondSignedRangeType.Bytes()...) // type.
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rawBytes = append(rawBytes, []byte{
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0x02, // length.
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0x79, 0x79, // value.
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}...)
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// Now, create a new empty message and decode the raw bytes into it.
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msg := &ChannelUpdate2{}
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r := bytes.NewReader(rawBytes)
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err = msg.Decode(r, 0)
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require.NoError(t, err)
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// Next, encode the message back into a new byte buffer.
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var b bytes.Buffer
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err = msg.Encode(&b, 0)
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require.NoError(t, err)
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// The re-encoded bytes should be exactly the same as the original raw
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// bytes.
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require.Equal(t, rawBytes, b.Bytes())
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}
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