Add method to calculate input for a trampoline fee #589
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This method returns the amount that needs to be provided to the trampoline payment handler in order to entirely consume a given amount, without leaving any dust. This allows the node to send all their balance over LN.
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This PR adds a method in
TrampolineFeethat returns the exact amount that must be provided to the trampoline payment handler in order to entirely consume a given amount, without leaving any dust.Specifically, this will allow a Phoenix wallet to send all its balance over LN.
Also, tests have been added for the existing
Trampoline.calculateFeesmethodExample:
1_000_000 sat4 sat + 0.4%992_032 msat, the fee would be7_968 msat.