v3 refactor (#1868)

* Move to v3

Co-authored-by: Ben Toogood <bentoogood@gmail.com>

server/mucp/options.go

@@ -0,0 +1,56 @@
+package mucp
+
+import (
+	"github.com/micro/go-micro/v3/broker/http"
+	"github.com/micro/go-micro/v3/codec"
+	"github.com/micro/go-micro/v3/registry/mdns"
+	"github.com/micro/go-micro/v3/server"
+	thttp "github.com/micro/go-micro/v3/transport/http"
+)
+
+func newOptions(opt ...server.Option) server.Options {
+	opts := server.Options{
+		Codecs:           make(map[string]codec.NewCodec),
+		Metadata:         map[string]string{},
+		RegisterInterval: server.DefaultRegisterInterval,
+		RegisterTTL:      server.DefaultRegisterTTL,
+	}
+
+	for _, o := range opt {
+		o(&opts)
+	}
+
+	if opts.Broker == nil {
+		opts.Broker = http.NewBroker()
+	}
+
+	if opts.Registry == nil {
+		opts.Registry = mdns.NewRegistry()
+	}
+
+	if opts.Transport == nil {
+		opts.Transport = thttp.NewTransport()
+	}
+
+	if opts.RegisterCheck == nil {
+		opts.RegisterCheck = server.DefaultRegisterCheck
+	}
+
+	if len(opts.Address) == 0 {
+		opts.Address = server.DefaultAddress
+	}
+
+	if len(opts.Name) == 0 {
+		opts.Name = server.DefaultName
+	}
+
+	if len(opts.Id) == 0 {
+		opts.Id = server.DefaultId
+	}
+
+	if len(opts.Version) == 0 {
+		opts.Version = server.DefaultVersion
+	}
+
+	return opts
+}