Block the mon update removing a preimage until upstream mon writes #2169
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## main #2169 +/- ##
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+ Coverage 90.45% 92.23% +1.77%
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Files 112 111 -1
Lines 58566 69661 +11095
Branches 58566 69661 +11095
==========================================
+ Hits 52977 64253 +11276
+ Misses 5589 5408 -181
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Could you fix the build? thanks! |
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Rebased on #2362 |
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This was referenced Jul 5, 2023
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Rebased. |
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Generally LGTM. Will have another look after squash |
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Squashed without further changes. |
When we need to rebroadcast a `commitment_signed` on reconnect in response to a previous update (ie not one which contains any updates) we previously hacked in support for it by passing a `-1` for the number of expected update_add_htlcs. This is a mess, and with the introduction of `ReconnectArgs` we can now clean it up easily with a new bool.
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Rebased without changes. |
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jkczyz
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Sep 12, 2023
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LGTM |
When we forward a payment and receive an `update_fulfill_htlc` message from the downstream channel, we immediately claim the HTLC on the upstream channel, before even doing a `commitment_signed` dance on the downstream channel. This implies that our `ChannelMonitorUpdate`s "go out" in the right order - first we ensure we'll get our money by writing the preimage down, then we write the update that resolves giving money on the downstream node. This is safe as long as `ChannelMonitorUpdate`s complete in the order in which they are generated, but of course looking forward we want to support asynchronous updates, which may complete in any order. Thus, here, we enforce the correct ordering by blocking the downstream `ChannelMonitorUpdate` until the upstream one completes. Like the `PaymentSent` event handling we do so only for the `revoke_and_ack` `ChannelMonitorUpdate`, ensuring the preimage-containing upstream update has a full RTT to complete before we actually manage to slow anything down.
`expect_payment_forwarded` takes a bool to indicate that the inbound channel on which we received a forwarded payment has been closed, but then ignores it in favor of looking at the fee in the event. While this is generally correct, in cases where we process an event after a channel was closed, which was generated before a channel closed this is incorrect. Instead, we examine the bool we already passed and use that.
Because some of these tests require connecting blocks without calling `get_and_clear_pending_msg_events`, we need to split up the block connection utilities to only optionally call sanity-checks.
Also allowing us to pass the event manually.
This adds a test for monitor update actions being completed on startup if a monitor update completed "while we were shut down" (or, really, the manager didn't get persisted after the update completed).
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Squashed without further changes. |
jkczyz
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Sep 12, 2023
valentinewallace
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When we forward a payment and receive an
update_fulfill_htlcmessage from the downstream channel, we immediately claim the HTLC
on the upstream channel, before even doing a
commitment_signeddance on the downstream channel. This implies that our
ChannelMonitorUpdates "go out" in the right order - first weensure we'll get our money by writing the preimage down, then we
write the update that resolves giving money on the downstream node.
This is safe as long as
ChannelMonitorUpdates complete in theorder in which they are generated, but of course looking forward we
want to support asynchronous updates, which may complete in any
order.
Thus, here, we enforce the correct ordering by blocking the
downstream
ChannelMonitorUpdateuntil the upstream one completes.Like the
PaymentSentevent handling we do so only for therevoke_and_ackChannelMonitorUpdate, ensuring thepreimage-containing upstream update has a full RTT to complete
before we actually manage to slow anything down.
This completes the work started in #2167 and depends on (and older version of) #2111 and #2112. This completes much of the work required for fully async ChannelMonitorUpdates. It introduces #2168, though I may try to fix that prior to marking ready, but its not super critical as even after this PR we do not "officially support" async ChannelMonitorUpdates.