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a612d759dd
New module DemandTracker registers an htlc_accepted deferrer that never holds an HTLC: for each forward it raises DemandObserved naming the outgoing channel, then immediately declines. The message deliberately carries no amount: unforwardable probe HTLCs cost an attacker nothing, so sizing from a demanded amount would be a free lever over our spend. XRebalancer consumes the message. A trigger arriving while any cycle runs is discarded (traffic recurrence re-arms real demand); otherwise it runs a demand cycle: the same fetch/join pipeline as a matched cycle, targeting the peer whose channel the forward exited through. Fill-pool membership is the entire criterion -- demand controls when we rebalance, never who qualifies or how much. The request restores the peer to the fill edge, priced at target NetPpm plus the minimum offered NetPpm, executed through the existing executor with cycle tag [demand]. The new in_flight flag serializes matched and demand cycles; both paths clear it behind a catch-all so an exception cannot wedge it. The catch-all around the matched tick also keeps the Poisson loop alive on RPC errors, which previously terminated it with only a stderr notice.
36 lines
1 KiB
C++
36 lines
1 KiB
C++
#include"Boss/Mod/DemandTracker.hpp"
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#include"Boss/Msg/DemandObserved.hpp"
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#include"Boss/Msg/ProvideHtlcAcceptedDeferrer.hpp"
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#include"Boss/Msg/SolicitHtlcAcceptedDeferrer.hpp"
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#include"Ev/Io.hpp"
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#include"Ln/HtlcAccepted.hpp"
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#include"S/Bus.hpp"
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namespace Boss { namespace Mod {
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void DemandTracker::start() {
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bus.subscribe<Msg::SolicitHtlcAcceptedDeferrer
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>([this](Msg::SolicitHtlcAcceptedDeferrer const&) {
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auto f = [this](Ln::HtlcAccepted::Request const& req) {
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return htlc_accepted(req);
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};
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return bus.raise(Msg::ProvideHtlcAcceptedDeferrer{
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std::move(f)
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});
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});
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}
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Ev::Io<bool>
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DemandTracker::htlc_accepted(Ln::HtlcAccepted::Request const& req) {
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/* Not a forward (we are the recipient)? */
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if (!req.next_channel)
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return Ev::lift(false);
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/* This runs in the hook path: raise (subscribers keep their
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* synchronous part cheap) and decline the HTLC either way. */
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auto msg = Msg::DemandObserved{req.next_channel};
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return bus.raise(std::move(msg)).then([]() {
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return Ev::lift(false);
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});
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}
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}}
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