link test: add TestChannelLinkWaitForRevocation
This commit adds a test where we trigger a situation which would previously make the link think it was never in sync, and potentially create a lot of empty state updates. This would happen if we were waiting for a revocation, while still receiving updates from the remote. Since in this case we could not ACK the updates because of the exhausted revocation window, our local commitchain would extend, while the remote chain would stall. When we finally got the revocation the local commitment height would be far larger than the remote, and FullySynced would return false from that point on.
This commit is contained in:
Johan T. Halseth
parent
db254c1258
commit
854e2a0581
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@ -4149,3 +4149,110 @@ func TestChannelLinkNoMoreUpdates(t *testing.T) {
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case <-time.After(100 * time.Millisecond):
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}
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}
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// TestChannelLinkWaitForRevocation tests that we will keep accepting updates
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// to our commitment transaction, even when we are waiting for a revocation
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// from the remote node.
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func TestChannelLinkWaitForRevocation(t *testing.T) {
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t.Parallel()
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const chanAmt = btcutil.SatoshiPerBitcoin * 5
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const chanReserve = btcutil.SatoshiPerBitcoin * 1
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aliceLink, bobChannel, _, cleanUp, _, err :=
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newSingleLinkTestHarness(chanAmt, chanReserve)
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if err != nil {
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t.Fatalf("unable to create link: %v", err)
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}
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defer cleanUp()
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var (
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coreLink = aliceLink.(*channelLink)
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aliceMsgs = coreLink.cfg.Peer.(*mockPeer).sentMsgs
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)
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// We will send 10 HTLCs in total, from Bob to Alice.
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numHtlcs := 10
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var htlcs []*lnwire.UpdateAddHTLC
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for i := 0; i < numHtlcs; i++ {
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htlc := generateHtlc(t, coreLink, bobChannel, uint64(i))
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htlcs = append(htlcs, htlc)
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}
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// We play out the following scenario:
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//
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// (1) Add the first HTLC.
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// (2) Bob sends signature covering the htlc.
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// (3) Since Bob has sent a new commitment signature, Alice should first
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// respond with a revocation. This revocation will ACK the first htlc.
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// (4) Alice should also send a commitment signature for the new state,
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// locking in the HTLC on Bob's commitment. Note that we don't
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// immediately let Bob respond with a revocation in this case.
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// (5.i) Now we send the rest of the HTLCs from Bob to Alice.
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// (6.i) Bob sends a new commitment signature, covering all HTLCs up
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// to this point.
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// (7.i) Alice should respond to Bob's state updates with revocations,
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// but cannot send any new signatures for Bob's state because her
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// revocation window is exhausted.
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// (8) Now let Bob finally send his revocation.
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// (9) We expect Alice to settle her first HTLC, since it was already
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// locked in.
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// (10) Now Alice should send a signature covering this settle + lock
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// in the rest of the HTLCs on Bob's commitment.
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// (11) Bob receives the new signature for his commitment, and can
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// revoke his old state, ACKing the settle.
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// (12.i) Now Alice can settle all the HTLCs, since they are locked in
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// on both parties' commitments.
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// (13) Bob can send a signature covering the first settle Alice sent.
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// Bob's signature should cover all the remaining HTLCs as well, since
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// he hasn't ACKed the last settles yet. Alice receives the signature
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// from Bob. Alice's commitment now has the first HTLC settled, and all
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// the other HTLCs locked in.
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// (14) Alice will send a signature for all the settles she just sent.
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// (15) Bob can revoke his previous state, in response to Alice's
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// signature.
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// (16) In response to the signature Bob sent, Alice can
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// revoke her previous state.
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// (17) Bob still hasn't sent a commitment covering all settles, so do
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// that now. Since Bob ACKed all settles, no HTLCs should be left on
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// the commitment.
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// (18) Alice will revoke her previous state.
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// Alice Bob
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// | |
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// | ... |
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// | | <--- idle (no htlc on either side)
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// | |
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sendHtlcBobToAlice(t, aliceLink, bobChannel, htlcs[0]) // |<----- add-1 ------| (1)
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sendCommitSigBobToAlice(t, aliceLink, bobChannel, 1) // |<------ sig -------| (2)
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receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------- rev ------>| (3) <--- Alice acks add-1
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receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, 1) // |------- sig ------>| (4) <--- Alice signs add-1
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for i := 1; i < numHtlcs; i++ { // | |
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sendHtlcBobToAlice(t, aliceLink, bobChannel, htlcs[i]) // |<----- add-i ------| (5.i)
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sendCommitSigBobToAlice(t, aliceLink, bobChannel, i+1) // |<------ sig -------| (6.i)
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receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------- rev ------>| (7.i) <--- Alice acks add-i
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select { // | |
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case <-aliceMsgs: // | | Alice should not send a sig for
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t.Fatalf("unexpectedly received msg from Alice") // | | Bob's last state, since she is
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default: // | | still waiting for a revocation
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} // | | for the previous one.
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} // | |
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sendRevAndAckBobToAlice(t, aliceLink, bobChannel) // |<------ rev -------| (8) Finally let Bob send rev
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receiveSettleAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------ ful-1 ----->| (9)
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receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, numHtlcs-1) // |------- sig ------>| (10) <--- Alice signs add-i
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sendRevAndAckBobToAlice(t, aliceLink, bobChannel) // |<------ rev -------| (11)
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for i := 1; i < numHtlcs; i++ { // | |
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receiveSettleAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------ ful-1 ----->| (12.i)
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} // | |
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sendCommitSigBobToAlice(t, aliceLink, bobChannel, numHtlcs-1) // |<------ sig -------| (13)
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receiveCommitSigAliceToBob(t, aliceMsgs, aliceLink, bobChannel, 0) // |------- sig ------>| (14)
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sendRevAndAckBobToAlice(t, aliceLink, bobChannel) // |<------ rev -------| (15)
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receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------- rev ------>| (16)
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sendCommitSigBobToAlice(t, aliceLink, bobChannel, 0) // |<------ sig -------| (17)
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receiveRevAndAckAliceToBob(t, aliceMsgs, aliceLink, bobChannel) // |------- rev ------>| (18)
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// Both side's state is now updated, no more messages should be sent.
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select {
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case <-aliceMsgs:
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t.Fatalf("did not expect message from Alice")
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case <-time.After(50 * time.Millisecond):
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}
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}
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