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BOLT 2: clarify comment about reversing uncommitted changes on reconnect, and timeouts.

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Olaoluwa pointed out that peers can make work for us by starting to open
connections then disconnecting: we need to allow timeouts, since it's
the simplest solution.

The comment about remembering `r` values (ie. `payment-preimage`) from
update_fulfill_htlc was also vague: it was meant to simply note that
it's not completely reversible, since the knowledge is (and probably
should be!) used to fulfill an incoming HTLC.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2017-01-17 12:33:46 +10:30
parent 614af24071
commit 9308eb145a
1 changed files with 5 additions and 3 deletions
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8
02-peer-protocol.md
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@ -863,12 +863,14 @@ any message), they are independent of requirements here.
A node MUST handle continuing a previous channel on a new encrypted
transport. On disconnection, a node MAY forget nodes which have not
sent or received an `accept_channel` message.
sent or received an `accept_channel` message, and MAY forget nodes
which have not sent `funding_locked` after a reasonable timeout.
On disconnection, a node MUST reverse any uncommitted updates sent by
the other side (ie. all messages beginning with `update_` for which no
`commitment_signed` has been received). A node SHOULD retain the `r`
value from the `update_fulfill_htlc`, however.
`commitment_signed` has been received). Note that a node MAY have
already use the `payment-preimage` value from the `update_fulfill_htlc`,
so the effects of `update_fulfill_htlc` is not completely reversed.
On reconnection, a node MUST retransmit old messages which may not
have been received, and MUST NOT retransmit old messages which have