Add ProbingService: optional service for periodic probe payments
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Thanks for looking into this!
Hmm, I think it makes sense to start out with a very simple strategy, but we should set this up to be more generic so that the ProbingService can handle a variety of different strategies going forward, ie., for example by adding a trait ProbingStrategy that the different strategies can implement. Such trait could have a simple fn next_target(probing_params: ProbingParameters) -> PublicKey method or similar.
- Add optional ProbingService to run periodic probe payments for liquidity checks. - Configure probing behavior by providing a public `ProbingStrategy` trait implementation. - Targets and selection logic are fully customizable by the user via the trait (no fixed target count is passed by the node).
- Add `HighCapacityStrategy` that selects top-N nodes by aggregate capacity from `NetworkGraph`. - Add lightweight caching with configurable reuse limit to avoid frequent graph scans. - Wireable from builder via `set_probing_service_with_high_capacity_strategy`
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I added the |
| loop { | ||
| if let Some(target) = self.strategy.next_target() { | ||
| let spontaneous_payment = self.spontaneous_payment(); | ||
| match spontaneous_payment.send_probes(self.probing_amount_msat, target) { |
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We probably want to be setting https://docs.rs/lightning/0.2.0-rc1/lightning/routing/scoring/struct.ProbabilisticScoringFeeParameters.html#structfield.probing_diversity_penalty_msat to something non-0 when doing background probing. Sadly the LDK ChannelManager::send_spontaneous_preflight_probes API used under the hood here doesn't allow overriding the scoring parameters, but calling ChannelManager:send_probe directly should be pretty easy, I think.
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Yes, I agree that this code should probably use the 'raw' LDK API here rather than reusing the LDK Node APIs. We might want to expose the diversity penalty, as well as the liquidity multiplier from send_preflight_probes (https://github.com/lightningdevkit/rust-lightning/blob/7177cfc958bd54e12fff730d337630131679b066/lightning/src/ln/channelmanager.rs#L5971-L6049) to be used.
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This introduces the ProbingService, an optional background task that periodically sends probe payments to selected network targets.
It supports customizable probing strategies through the new ProbingStrategy trait, which defines two methods:
Two strategies are currently supported:
The high-capacity strategy includes a caching mechanism to reuse targets for several cycles (e.g., 10), improving efficiency and reducing redundant network scans.