config: add channel commit batch size parameter

config.go

@@ -145,6 +145,11 @@ const (
 	// defaultChannelCommitInterval is the default maximum time between receiving a
 	// channel state update and signing a new commitment.
 	defaultChannelCommitInterval = 50 * time.Millisecond
+
+	// defaultChannelCommitBatchSize is the default maximum number of
+	// channel state updates that is accumulated before signing a new
+	// commitment.
+	defaultChannelCommitBatchSize = 10
 )
 
 var (
@@ -293,7 +298,8 @@ type Config struct {
 	MaxChanSize                   int64         `long:"maxchansize" description:"The largest channel size (in satoshis) that we should accept. Incoming channels larger than this will be rejected"`
 	CoopCloseTargetConfs          uint32        `long:"coop-close-target-confs" description:"The target number of blocks that a cooperative channel close transaction should confirm in. This is used to estimate the fee to use as the lower bound during fee negotiation for the channel closure."`
 
-	ChannelCommitInterval time.Duration `long:"channel-commit-interval" description:"The maximum time that is allowed to pass between receiving a channel state update and signing the next commitment. Setting this to a longer duration allows for more efficient channel operations at the cost of latency."`
+	ChannelCommitInterval  time.Duration `long:"channel-commit-interval" description:"The maximum time that is allowed to pass between receiving a channel state update and signing the next commitment. Setting this to a longer duration allows for more efficient channel operations at the cost of latency."`
+	ChannelCommitBatchSize uint32        `long:"channel-commit-batch-size" description:"The maximum number of channel state updates that is accumulated before signing a new commitment."`
 
 	DefaultRemoteMaxHtlcs uint16 `long:"default-remote-max-htlcs" description:"The default max_htlc applied when opening or accepting channels. This value limits the number of concurrent HTLCs that the remote party can add to the commitment. The maximum possible value is 483."`
 
@@ -514,6 +520,7 @@ func DefaultConfig() Config {
 		registeredChains:        chainreg.NewChainRegistry(),
 		ActiveNetParams:         chainreg.BitcoinTestNetParams,
 		ChannelCommitInterval:   defaultChannelCommitInterval,
+		ChannelCommitBatchSize:  defaultChannelCommitBatchSize,
 	}
 }