health: Add CLI flag

cmd/geth/config.go

@@ -196,9 +196,10 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 	// Configure log filter RPC API.
 	filterSystem := utils.RegisterFilterAPI(stack, backend, &cfg.Eth)
 
-	// TODO: ENG191 add flag to request endpoint
-	utils.RegisterHealthService(stack, &cfg.Node)
-
+	// Configure the healthcheck API if requested.
+	if ctx.IsSet(utils.HTTPHealthEnabledFlag.Name) {
+		utils.RegisterHealthService(stack, &cfg.Node)
+	}
 	// Configure GraphQL if requested.
 	if ctx.IsSet(utils.GraphQLEnabledFlag.Name) {
 		utils.RegisterGraphQLService(stack, backend, filterSystem, &cfg.Node)

cmd/geth/main.go

@@ -153,6 +153,7 @@ var (
 		utils.HTTPListenAddrFlag,
 		utils.HTTPPortFlag,
 		utils.HTTPCORSDomainFlag,
+		utils.HTTPHealthEnabledFlag,
 		utils.AuthListenFlag,
 		utils.AuthPortFlag,
 		utils.AuthVirtualHostsFlag,

cmd/utils/flags.go

@@ -614,6 +614,11 @@ var (
 		Value:    "",
 		Category: flags.APICategory,
 	}
+	HTTPHealthEnabledFlag = &cli.BoolFlag{
+		Name:     "http.health",
+		Usage:    "Enable the HTTP healthcheck API at path '/health'.",
+		Category: flags.APICategory,
+	}
 	GraphQLEnabledFlag = &cli.BoolFlag{
 		Name:     "graphql",
 		Usage:    "Enable GraphQL on the HTTP-RPC server. Note that GraphQL can only be started if an HTTP server is started as well.",