router: improve router configuration (micro#1745)

* router: update default address to :8084

* service: add router to service options

* config/cmd: improve router setup

config/cmd/cmd.go

@@ -343,6 +343,11 @@ var (
 			EnvVars: []string{"MICRO_ROUTER"},
 			Usage:   "Router used for client requests",
 		},
+		&cli.StringFlag{
+			Name:    "router_address",
+			Usage:   "Comma-separated list of router addresses",
+			EnvVars: []string{"MICRO_ROUTER_ADDRESS"},
+		},
 	}
 
 	DefaultBrokers = map[string]func(...broker.Option) broker.Broker{
@@ -691,16 +696,25 @@ func (c *cmd) Before(ctx *cli.Context) error {
 	// Set the router, this must happen before the rest of the server as it'll route server requests
 	// such as go.micro.config if no address is specified
 	routerOpts := []router.Option{
+		srvRouter.Client(microClient),
 		router.Network(ctx.String("service_namespace")),
 		router.Registry(*c.opts.Registry),
-		srvRouter.Client(microClient),
+		router.Id((*c.opts.Server).Options().Id),
+	}
+	if len(ctx.String("router_address")) > 0 {
+		routerOpts = append(routerOpts, router.Address(ctx.String("router_address")))
 	}
 	if name := ctx.String("router"); len(name) > 0 && (*c.opts.Router).String() != name {
 		r, ok := c.opts.Routers[name]
 		if !ok {
 			return fmt.Errorf("Router %s not found", name)
 		}
 
+		// close the default router before replacing it
+		if err := (*c.opts.Router).Close(); err != nil {
+			logger.Fatalf("Error closing default router: %s", name)
+		}
+
 		*c.opts.Router = r(routerOpts...)
 		// todo: set the router in the client
 		// clientOpts = append(clientOpts, client.Router(*c.opts.Router))

options.go

@@ -14,6 +14,7 @@ import (
 	"github.com/micro/go-micro/v2/debug/profile"
 	"github.com/micro/go-micro/v2/debug/trace"
 	"github.com/micro/go-micro/v2/registry"
+	"github.com/micro/go-micro/v2/router"
 	"github.com/micro/go-micro/v2/runtime"
 	"github.com/micro/go-micro/v2/server"
 	"github.com/micro/go-micro/v2/store"
@@ -30,6 +31,7 @@ type Options struct {
 	Server    server.Server
 	Store     store.Store
 	Registry  registry.Registry
+	Router    router.Router
 	Runtime   runtime.Runtime
 	Transport transport.Transport
 	Profile   profile.Profile
@@ -57,6 +59,7 @@ func newOptions(opts ...Option) Options {
 		Server:    server.DefaultServer,
 		Store:     store.DefaultStore,
 		Registry:  registry.DefaultRegistry,
+		Router:    router.DefaultRouter,
 		Runtime:   runtime.DefaultRuntime,
 		Transport: transport.DefaultTransport,
 		Context:   context.Background(),

router/router.go

@@ -7,7 +7,7 @@ import (
 
 var (
 	// DefaultAddress is default router address
-	DefaultAddress = ":9093"
+	DefaultAddress = ":8084"
 	// DefaultName is default router service name
 	DefaultName = "go.micro.router"
 	// DefaultNetwork is default micro network