Add pub/sub to client/server and make broker more low level

client/options.go

@@ -0,0 +1,31 @@
+package client
+
+import (
+	"github.com/myodc/go-micro/broker"
+	"github.com/myodc/go-micro/registry"
+	"github.com/myodc/go-micro/transport"
+)
+
+type options struct {
+	broker    broker.Broker
+	registry  registry.Registry
+	transport transport.Transport
+}
+
+func Broker(b broker.Broker) Option {
+	return func(o *options) {
+		o.broker = b
+	}
+}
+
+func Registry(r registry.Registry) Option {
+	return func(o *options) {
+		o.registry = r
+	}
+}
+
+func Transport(t transport.Transport) Option {
+	return func(o *options) {
+		o.transport = t
+	}
+}