[WIP] Askrene: add activation cost to channels #8543
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Add a base probability cost to simulate random channel outage and penalize for long paths or many routes solutions. Changelog-None Signed-off-by: Lagrang3 <[email protected]>
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With this PR we change the topology of the MCF problem to be able to add activation costs to channels.Use cases:- base fees,- constant probability of failure for channels,- reduction in the number of routes as well as their length,With this PR we add a simple approximation to channel activation cost by including a parameter
base_prob(in the range [0,1])that represents the probability of a channel being online and accepting forward requests.
The activation cost of the channel is linearized by simply assuming an extra cost per arc like:
where T is the total payment amount.
The smaller the value of
base_probthe less likely our solver will produce long paths or many routes solutions.Hence the caller can tune it to satisfy desired maxparts or maxlength constraints.
For this PR we borrowed the same methodology from renepay #7540.
It addresses one of the points raised in issue #8486.
base_probvalues