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b0f0715813
When iterating edges, pathfinding checks early whether using an edge would violate the requested total fee limit for a route. This check is done on the net amount (an amount the inbound fee is calculated with). However, a possible next hop's fee discount leads to a reduction in fees and as such using the net amount leads to assuming a higher cumulative fee than the route really has, excluding the path erroneously. We perform the fee limit check on the amount to send, which includes both inbound and outbound fees. This should be possible as the first hop's outbound fee is zero and therefore doesn't have to be checked in the end.
routing
The routing package implements authentication+validation of channel announcements, pruning of the channel graph, path finding within the network, sending outgoing payments into the network and synchronizing new peers to our channel graph state.
Installation and Updating
$ go get -u github.com/lightningnetwork/lnd/routing