Pay: handle when we're close to htlc limit #4563
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rustyrussell
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Added one last fix that makes sure we don't exhaust the HTLC budget outright with the pre-splitter, leaving us some wiggle room to adapt to failures. @rustyrussell, can you review this despite being the opener? :D |
As you can see, I did a lot of debugging before realizing that the actual problem is in the pay plugin :( Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This was triggered by having some part being started after the overall command already gave up, cleaning up the `cmd` context from which the routehints were allocated. The early exit of the command, as a result from a terminal state does not guarantee that no later attempt will try to find a route, especially if the attempt was started before we knew that it is doomed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We were counting the attempts including the root payment, which resulted in an off-by-one error with the `test_pay_low_max_htlcs` test. Counting the children of the root payment after the presplitter had a go is the correct way to do it, since at that time we only have one level in the tree, no need to recurse and potentially count ourselves.
Changelog-Fixed: pay: The presplitter mod will no longer exhaust the HTLC budget.
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Didn't fix the problem, broke pay :( Help @cdecker !