Add network proxying (#1556)

* Add network proxying

* go fmt

grpc.go

@@ -6,7 +6,6 @@ import (
 	"crypto/tls"
 	"fmt"
 	"net"
-	"os"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -20,6 +19,7 @@ import (
 	"github.com/micro/go-micro/v2/metadata"
 	"github.com/micro/go-micro/v2/registry"
 	"github.com/micro/go-micro/v2/util/config"
+	pnet "github.com/micro/go-micro/v2/util/net"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -74,27 +74,13 @@ func (g *grpcClient) secure(addr string) grpc.DialOption {
 }
 
 func (g *grpcClient) next(request client.Request, opts client.CallOptions) (selector.Next, error) {
-	service := request.Service()
+	service, address, _ := pnet.Proxy(request.Service(), opts.Address)
-
-	// get proxy
-	if prx := os.Getenv("MICRO_PROXY"); len(prx) > 0 {
-		// default name
-		if prx == "service" {
-			prx = "go.micro.proxy"
-		}
-		service = prx
-	}
-
-	// get proxy address
-	if prx := os.Getenv("MICRO_PROXY_ADDRESS"); len(prx) > 0 {
-		opts.Address = []string{prx}
-	}
 
 	// return remote address
-	if len(opts.Address) > 0 {
+	if len(address) > 0 {
 		return func() (*registry.Node, error) {
 			return &registry.Node{
-				Address: opts.Address[0],
+				Address: address[0],
 			}, nil
 		}, nil
 	}