Create generic method to implements the request/response pattern

reach/client.go

@@ -5,6 +5,7 @@ import (
 
 	"forge.cadoles.com/Pyxis/golang-socketio"
 	"forge.cadoles.com/Pyxis/golang-socketio/transport"
+	"github.com/mitchellh/mapstructure"
 	"github.com/pkg/errors"
 )
 
@@ -72,6 +73,34 @@ func (c *client) Close() {
 	c.conn = nil
 }
 
+func (c *client) fetch(requestEvent string, requestData interface{}, responseEvent string, res interface{}) error {
+
+	var err error
+	var wg sync.WaitGroup
+
+	wg.Add(1)
+
+	err = c.conn.On(responseEvent, func(_ *gosocketio.Channel, data interface{}) {
+		err = mapstructure.Decode(data, res)
+		c.conn.Off(responseEvent)
+		wg.Done()
+	})
+	if err != nil {
+		return errors.Wrapf(err, "error while binding to '%s' event", responseEvent)
+	}
+
+	c.logf("sending '%s' event", requestEvent)
+	if err = c.conn.Emit(requestEvent, requestData); err != nil {
+		return errors.Wrapf(err, "error while emitting '%s' event", requestEvent)
+	}
+	c.logf("'%s' event sent", requestEvent)
+
+	wg.Wait()
+
+	return err
+
+}
+
 func (c *client) logf(format string, args ...interface{}) {
 	if c.opts.Logger == nil {
 		return