lncfg: add new PrunedNodeMaxPeers config option/flag

chainreg/chainregistry.go

@@ -397,6 +397,7 @@ func NewChainControl(cfg *Config) (*ChainControl, error) {
 			ZMQTxHost:          bitcoindMode.ZMQPubRawTx,
 			ZMQReadDeadline:    5 * time.Second,
 			Dialer:             cfg.Dialer,
+			PrunedModeMaxPeers: bitcoindMode.PrunedNodeMaxPeers,
 		})
 		if err != nil {
 			return nil, err

config.go

@@ -183,6 +183,8 @@ var (
 	defaultBitcoindEstimateMode = "CONSERVATIVE"
 	bitcoindEstimateModes       = [2]string{"ECONOMICAL", defaultBitcoindEstimateMode}
 
+	defaultPrunedNodeMaxPeers = 4
+
 	defaultSphinxDbName = "sphinxreplay.db"
 )
 
@@ -395,6 +397,7 @@ func DefaultConfig() Config {
 			Dir:                defaultBitcoindDir,
 			RPCHost:            defaultRPCHost,
 			EstimateMode:       defaultBitcoindEstimateMode,
+			PrunedNodeMaxPeers: defaultPrunedNodeMaxPeers,
 		},
 		Litecoin: &lncfg.Chain{
 			MinHTLCIn:     chainreg.DefaultLitecoinMinHTLCInMSat,
@@ -414,6 +417,7 @@ func DefaultConfig() Config {
 			Dir:                defaultLitecoindDir,
 			RPCHost:            defaultRPCHost,
 			EstimateMode:       defaultBitcoindEstimateMode,
+			PrunedNodeMaxPeers: defaultPrunedNodeMaxPeers,
 		},
 		NeutrinoMode: &lncfg.Neutrino{
 			UserAgentName:    neutrino.UserAgentName,

lncfg/bitcoind.go

@@ -10,4 +10,5 @@ type Bitcoind struct {
 	ZMQPubRawBlock     string `long:"zmqpubrawblock" description:"The address listening for ZMQ connections to deliver raw block notifications"`
 	ZMQPubRawTx        string `long:"zmqpubrawtx" description:"The address listening for ZMQ connections to deliver raw transaction notifications"`
 	EstimateMode       string `long:"estimatemode" description:"The fee estimate mode. Must be either ECONOMICAL or CONSERVATIVE."`
+	PrunedNodeMaxPeers int    `long:"pruned-node-max-peers" description:"The maximum number of peers lnd will choose from the backend node to retrieve pruned blocks from. This only applies to pruned nodes."`
 }

sample-lnd.conf

@@ -536,6 +536,10 @@ bitcoin.node=btcd
 ; If unset, the default value is "CONSERVATIVE".
 ; bitcoind.estimatemode=CONSERVATIVE
 
+; The maximum number of peers lnd will choose from the backend node to retrieve
+; pruned blocks from. This only applies to pruned nodes.
+; bitcoind.pruned-node-max-peers=4
+
 [neutrino]
 
 ; Connect only to the specified peers at startup. This creates a persistent
@@ -706,6 +710,10 @@ litecoin.node=ltcd
 ; If unset, the default value is "CONSERVATIVE".
 ; litecoind.estimatemode=CONSERVATIVE
 
+; The maximum number of peers lnd will choose from the backend node to retrieve
+; pruned blocks from. This only applies to pruned nodes.
+; litecoind.pruned-node-max-peers=4
+
 [autopilot]
 
 ; If the autopilot agent should be active or not. The autopilot agent will