lnd: Create the callback function to update the estimator info on main cfg

Create the callback function (UpdateRoutingConfig) to update the
estimator info on main cfg. The callback function is a parameter
on NewMissionControl function.

Author: MPins

rpcserver.go

@@ -6928,6 +6928,10 @@ func (r *rpcServer) DebugLevel(ctx context.Context,
 	if err != nil {
 		return nil, err
 	}
+	
+	// There is no error parsing the LevelSpec, so we'll update
+	// the current debug level, without checking everything again.
+	r.cfg.DebugLevel = req.LevelSpec
 
 	return &lnrpc.DebugLevelResponse{}, nil
 }

server.go

@@ -923,8 +923,12 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 				routingConfig.ProbabilityEstimatorType)
 		}
 	}
-
+	
+	// UpdateRoutingConfig is a function that will be called by the
+	// mission control instance every time a new estimator value 
+	// is setted.
 	mcCfg := &routing.MissionControlConfig{
+		UpdateEstimator:	 s.UpdateRoutingConfig,
 		Estimator:               estimator,
 		MaxMcHistory:            routingConfig.MaxMcHistory,
 		McFlushInterval:         routingConfig.McFlushInterval,
@@ -1680,6 +1684,33 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 	return s, nil
 }
 
+// UpdateRoutingConfig is a callback function to update the routing config  
+// values in the main cfg when the lncli setmccfg is called. 
+ func (s *server) UpdateRoutingConfig(estimator routing.Estimator) {
+	routerCfg := s.cfg.SubRPCServers.RouterRPC
+	
+	switch c := estimator.Config().(type) {
+	case routing.AprioriConfig:
+		routerCfg.ProbabilityEstimatorType =
+			routing.AprioriEstimatorName
+
+		targetCfg := s.cfg.SubRPCServers.RouterRPC.AprioriConfig
+		targetCfg.PenaltyHalfLife = c.PenaltyHalfLife
+		targetCfg.Weight = c.AprioriWeight
+		targetCfg.CapacityFraction = c.CapacityFraction
+		targetCfg.HopProbability = c.AprioriHopProbability
+
+	case routing.BimodalConfig:
+		routerCfg.ProbabilityEstimatorType =
+			routing.BimodalEstimatorName
+			
+		targetCfg := s.cfg.SubRPCServers.RouterRPC.BimodalConfig
+		targetCfg.Scale = int64(c.BimodalScaleMsat)
+		targetCfg.NodeWeight = c.BimodalNodeWeight
+		targetCfg.DecayTime = c.BimodalDecayTime 
+	}
+}
+
 // signAliasUpdate takes a ChannelUpdate and returns the signature. This is
 // used for option_scid_alias channels where the ChannelUpdate to be sent back
 // may differ from what is on disk.