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Implement the on-the-fly funding protocol: when a payment cannot be relayed because of a liquidity issue, we notify the `Peer` actor that we'd like to trigger on-the-fly funding if available. If available, we we send a funding proposal to our peer and keep track of its status. Once a matching funding transaction is signed, we persist this funding attempt and wait for the additional liquidity to be available (once the channel is ready or the splice locked). We will then frequently try to relay the payment to get paid our liquidity fees. If the payment keeps getting rejected, or we cannot connect to our peer, we abandon the payment when it reaches its CLTV expiry, which ensures that the upstream channels are not at risk. When using on-the-fly funding, we use a single channel with our peer. If they try to open another channel while one is available, we reject their request and expect a splice instead.
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