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askrene: remove all small channels if there's no MPP support.

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This is an inefficient hack.  Can you tell I really didn't want to
implement this?  MPP was finalized in 2018 FFS.

We do this by adding another "auto" layer, which removes all too-small
channels, and then makes our MPP node pile all the funds into the largest
channel it chooses.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2025-02-14 15:21:48 +10:30
parent 5b74e98201
commit 461eb2eddb
6 changed files with 100 additions and 8 deletions
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2
doc/schemas/lightning-getroutes.json
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@@ -11,7 +11,7 @@
"",
"Layers are generally maintained by plugins, either to contain persistent information about capacities which have been discovered, or to contain transient information for this particular payment (such as blinded paths or routehints).",
"",
"There are two automatic layers: *auto.localchans* contains information on local channels from this node (including non-public ones), and their exact current spendable capacities, and *auto.sourcefree* overrides all channels (including those from previous layers) leading out of the *source* to be zero fee and zero delay. These are both useful in the case where the source is the current node."
"There are three automatic layers: *auto.localchans* contains information on local channels from this node (including non-public ones), and their exact current spendable capacities. *auto.sourcefree* overrides all channels (including those from previous layers) leading out of the *source* to be zero fee and zero delay. These are both useful in the case where the source is the current node. And *auto.no_mpp_support* forces getroutes to return a single flow, though only basic checks are done that the result is useful."
],
"categories": [
"readonly"