lnd.xprv/htlcswitch/hop/iterator_test.go

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package hop
import (
"bytes"
"encoding/binary"
"testing"
"github.com/davecgh/go-spew/spew"
sphinx "github.com/lightningnetwork/lightning-onion"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/record"
"github.com/lightningnetwork/lnd/tlv"
)
// TestSphinxHopIteratorForwardingInstructions tests that we're able to
// properly decode an onion payload, no matter the payload type, into the
// original set of forwarding instructions.
func TestSphinxHopIteratorForwardingInstructions(t *testing.T) {
t.Parallel()
// First, we'll make the hop data that the sender would create to send
// an HTLC through our imaginary route.
hopData := sphinx.HopData{
ForwardAmount: 100000,
OutgoingCltv: 4343,
}
copy(hopData.NextAddress[:], bytes.Repeat([]byte("a"), 8))
// Next, we'll make the hop forwarding information that we should
// extract each type, no matter the payload type.
nextAddrInt := binary.BigEndian.Uint64(hopData.NextAddress[:])
expectedFwdInfo := ForwardingInfo{
NextHop: lnwire.NewShortChanIDFromInt(nextAddrInt),
AmountToForward: lnwire.MilliSatoshi(hopData.ForwardAmount),
OutgoingCTLV: hopData.OutgoingCltv,
}
// For our TLV payload, we'll serialize the hop into into a TLV stream
// as we would normally in the routing network.
var b bytes.Buffer
tlvRecords := []tlv.Record{
record.NewAmtToFwdRecord(&hopData.ForwardAmount),
record.NewLockTimeRecord(&hopData.OutgoingCltv),
record.NewNextHopIDRecord(&nextAddrInt),
}
tlvStream, err := tlv.NewStream(tlvRecords...)
if err != nil {
t.Fatalf("unable to create stream: %v", err)
}
if err := tlvStream.Encode(&b); err != nil {
t.Fatalf("unable to encode stream: %v", err)
}
var testCases = []struct {
sphinxPacket *sphinx.ProcessedPacket
expectedFwdInfo ForwardingInfo
}{
// A regular legacy payload that signals more hops.
{
sphinxPacket: &sphinx.ProcessedPacket{
Payload: sphinx.HopPayload{
Type: sphinx.PayloadLegacy,
},
Action: sphinx.MoreHops,
ForwardingInstructions: &hopData,
},
expectedFwdInfo: expectedFwdInfo,
},
// A TLV payload, we can leave off the action as we'll always
// read the cid encoded.
{
sphinxPacket: &sphinx.ProcessedPacket{
Payload: sphinx.HopPayload{
Type: sphinx.PayloadTLV,
Payload: b.Bytes(),
},
},
expectedFwdInfo: expectedFwdInfo,
},
}
// Finally, we'll test that we get the same set of
// ForwardingInstructions for each payload type.
iterator := sphinxHopIterator{}
for i, testCase := range testCases {
iterator.processedPacket = testCase.sphinxPacket
pld, err := iterator.HopPayload()
if err != nil {
t.Fatalf("#%v: unable to extract forwarding "+
"instructions: %v", i, err)
}
fwdInfo := pld.ForwardingInfo()
if fwdInfo != testCase.expectedFwdInfo {
t.Fatalf("#%v: wrong fwding info: expected %v, got %v",
i, spew.Sdump(testCase.expectedFwdInfo),
spew.Sdump(fwdInfo))
}
}
}