Add endopoint to check is a given port is open on the client (#22)

service/port_scanner.go

@@ -0,0 +1,21 @@
+package service
+
+import (
+	"net"
+	"time"
+)
+
+type PortScanner struct {
+	Address net.Addr
+}
+
+func (p *PortScanner) IsPortOpen() (bool, error) {
+	conn, err := net.DialTimeout(p.Address.Network(), p.Address.String(), 3*time.Second)
+	if err != nil {
+		return false, err
+	}
+	if conn != nil {
+		defer conn.Close()
+	}
+	return true, nil
+}