use persisted connections and handle died

tcp-client.go

@@ -33,6 +33,8 @@ type TCPClient struct {
 
 type PersistentConnection struct {
 	net.Conn
+	Died    chan bool
+	Dead    bool
 	address string
 }
 
@@ -43,21 +45,29 @@ func NewPersistentConnection(address string) (*PersistentConnection, error) {
 	}
 	return &PersistentConnection{
 		Conn:    connection,
+		Died:    make(chan bool, 1),
+		Dead:    false,
 		address: address,
 	}, nil
 }
 
 func (m *PersistentConnection) Connect() error {
-	connection, err := net.Dial("tcp", m.address)
-	if err != nil {
-		return err
+	if !m.Dead {
+		connection, err := net.Dial("tcp", m.address)
+		if err != nil {
+			m.Died <- true
+			m.Dead = true
+			return err
+		}
+		m.Conn = connection
 	}
-	m.Conn = connection
 	return nil
 }
 
 func (m *PersistentConnection) Close() {
 	m.Conn.Close()
+	m.Died <- true
+	m.Dead = true
 }
 
 func (m *PersistentConnection) HandleConnectionError(err error) error {