From 9fa237bffacb25f1397bf78165a3406da916b630 Mon Sep 17 00:00:00 2001
From: "unai.avila" <unai.avila@fonyou.com>
Date: Tue, 2 Sep 2014 17:29:20 +0200
Subject: Add ping method

---
 conn.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/conn.go b/conn.go
index b9c4560..862b5ff 100644
--- a/conn.go
+++ b/conn.go
@@ -292,3 +292,46 @@ func (l *Conn) reader() {
 
 	}
 }
+// Use Abandon operation to perform connection keepalives
+func (l *Conn) Ping() error {
+
+  messageID := l.nextMessageID()
+
+  packet := ber.Encode(ber.ClassUniversal, ber.TypeConstructed, ber.TagSequence, nil, "LDAP Request")
+  packet.AppendChild(ber.NewInteger(ber.ClassUniversal, ber.TypePrimitive, ber.TagInteger, messageID, "MessageID"))
+  abandonRequest := ber.Encode(ber.ClassApplication, ber.TypePrimitive, ApplicationAbandonRequest, nil, "Abandon Request")
+  packet.AppendChild(abandonRequest)
+
+  if l.Debug {
+    ber.PrintPacket(packet)
+  }
+
+  channel, err := l.sendMessage(packet)
+  if err != nil {
+    return err
+  }
+  if channel == nil {
+    return NewError(ErrorNetwork, errors.New("ldap: could not send message"))
+  }
+  defer l.finishMessage(messageID)
+
+  packet = <-channel
+  if packet == nil {
+    return NewError(ErrorNetwork, errors.New("ldap: could not retrieve response"))
+  }
+
+  if l.Debug {
+    if err := addLDAPDescriptions(packet); err != nil {
+      return err
+    }
+    ber.PrintPacket(packet)
+  }
+
+  resultCode, resultDescription := getLDAPResultCode(packet)
+  if resultCode != 0 {
+    return NewError(resultCode, errors.New(resultDescription))
+  }
+
+  return nil
+}
+
-- 
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