added ulc config params (#1255)

* added ulc config params

* fmt

* fix lint

node/node.go

@@ -218,6 +218,10 @@ func activateLightEthService(stack *node.Node, config *params.NodeConfig) error
 	ethConf.SyncMode = downloader.LightSync
 	ethConf.NetworkId = config.NetworkID
 	ethConf.DatabaseCache = config.LightEthConfig.DatabaseCache
+	ethConf.ULC = &eth.ULCConfig{
+		TrustedServers:     config.LightEthConfig.TrustedNodes,
+		MinTrustedFraction: config.LightEthConfig.MinTrustedFraction,
+	}
 	return stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
 		return les.New(ctx, &ethConf)
 	})

params/config.go

@@ -31,6 +31,12 @@ type LightEthConfig struct {
 
 	// DatabaseCache is memory (in MBs) allocated to internal caching (min 16MB / database forced)
 	DatabaseCache int
+
+	// TrustedNodes is a list of trusted servers
+	TrustedNodes []string
+
+	//MinTrustedFraction is minimum percentage of connected trusted servers to validate header(1-100)
+	MinTrustedFraction int
 }
 
 // ----------