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Min. Cost Flow does not take into account fees when computing a flow
with liquidity constraints.
This is a work-around solution that reduces the amount on every route to
respect the liquidity bound. The deficity in the delivered amount is
solved by running MCF once again.
Changes:
1. the function `flow_complete` allocates amounts to send over the set of routes
computed by the MCF algorithm, but it does not allocate more than liquidity
bound of the route. For this reason `minflow` returns a set of routes that
satisfy the liquidity bounds but it is not guaranteed that the total payment
reaches the destination therefore there could a deficit in the delivery:
`deficit = amount_to_deliver - delivering`.
2. in the function `add_payflows` after `minflow` returns a set of routes we
call `flows_fit_amount` that tries to a allocate the `deficit` in the routes
that the MCF have computed.
3. if the resulting flows pass all payment constraints then we update
`amount_to_deliver = amount_to_deliver - delivering`, and the loop
repeats as long as `amount_to_deliver` is not zero.
In other words, the excess amount, beyond the liquidity bound,
in the routes is removed and then we try to allocate it
into known routes, otherwise we do a whole MCF again just for the
remaining amount.
Fixes issue #6599
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| .. | ||
| bkpr | ||
| clnrest | ||
| examples | ||
| grpc-plugin | ||
| renepay | ||
| spender | ||
| src | ||
| test | ||
| .gitignore | ||
| autoclean.c | ||
| bcli.c | ||
| Cargo.toml | ||
| chanbackup.c | ||
| commando.c | ||
| fetchinvoice.c | ||
| funder.c | ||
| funder_policy.c | ||
| funder_policy.h | ||
| keysend.c | ||
| libplugin-pay.c | ||
| libplugin-pay.h | ||
| libplugin.c | ||
| libplugin.h | ||
| Makefile | ||
| offers.c | ||
| offers.h | ||
| offers_inv_hook.c | ||
| offers_inv_hook.h | ||
| offers_invreq_hook.c | ||
| offers_invreq_hook.h | ||
| offers_offer.c | ||
| offers_offer.h | ||
| pay.c | ||
| README.md | ||
| sql.c | ||
| topology.c | ||
| txprepare.c | ||
Plugin Directory
Any file in this directory which is executable and whose name only consists of alphanumeric characters, space, '.', '-' or '_' will be automatically loaded when lightningd starts (unless suppressed with commandline options).