add goa examples

go/goa_example/cmd/host-cli/grpc.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	cli "goa_example/gen/grpc/cli/host"
+	"os"
+
+	goa "goa.design/goa/v3/pkg"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+func doGRPC(scheme, host string, timeout int, debug bool) (goa.Endpoint, interface{}, error) {
+	conn, err := grpc.Dial(host, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "could not connect to gRPC server at %s: %v\n", host, err)
+	}
+	return cli.ParseEndpoint(conn)
+}