From 1499a0a83e60c1780500b2d1afa6dd236b53f101 Mon Sep 17 00:00:00 2001
From: Albin Gilles <gilles.albin@gmail.com>
Date: Mon, 29 Feb 2016 12:20:49 +0100
Subject: [PATCH] Add a Ping() function on to call the _ping endpoint

---
 dockerclient.go      | 10 ++++++++++
 dockerclient_test.go |  9 +++++++++
 2 files changed, 19 insertions(+)

diff --git a/dockerclient.go b/dockerclient.go
index 51a00b2..10be104 100644
--- a/dockerclient.go
+++ b/dockerclient.go
@@ -156,6 +156,16 @@ func (client *DockerClient) Info() (*Info, error) {
 	return ret, nil
 }
 
+func (client *DockerClient) Ping() (string, error) {
+	uri := fmt.Sprintf("/%s/_ping", APIVersion)
+	data, err := client.doRequest("GET", uri, nil, nil)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
+
 func (client *DockerClient) ListContainers(all bool, size bool, filters string) ([]Container, error) {
 	argAll := 0
 	if all == true {
diff --git a/dockerclient_test.go b/dockerclient_test.go
index 7c7b3f5..179cdb8 100644
--- a/dockerclient_test.go
+++ b/dockerclient_test.go
@@ -76,6 +76,15 @@ func TestInfo(t *testing.T) {
 	assertEqual(t, info.Containers, int64(2), "")
 }
 
+func TestPing(t *testing.T) {
+	client := testDockerClient(t)
+	pong, err := client.Ping()
+	if err != nil {
+		t.Fatal("Cannot ping server")
+	}
+	assertEqual(t, pong, "OK", "")
+}
+
 func TestKillContainer(t *testing.T) {
 	client := testDockerClient(t)
 	if err := client.KillContainer("23132acf2ac", "5"); err != nil {