[AIRFLOW-2670] Update SSH Operator's Hook to respect timeout (apache#…

…3666)

airflow/contrib/operators/ssh_operator.py

@@ -69,16 +69,17 @@ def __init__(self,
     def execute(self, context):
         try:
             if self.ssh_conn_id and not self.ssh_hook:
-                self.ssh_hook = SSHHook(ssh_conn_id=self.ssh_conn_id)
+                self.ssh_hook = SSHHook(ssh_conn_id=self.ssh_conn_id,
+                                        timeout=self.timeout)
 
             if not self.ssh_hook:
-                raise AirflowException("can not operate without ssh_hook or ssh_conn_id")
+                raise AirflowException("Cannot operate without ssh_hook or ssh_conn_id.")
 
             if self.remote_host is not None:
                 self.ssh_hook.remote_host = self.remote_host
 
             if not self.command:
-                raise AirflowException("no command specified so nothing to execute here.")
+                raise AirflowException("SSH command not specified. Aborting.")
 
             with self.ssh_hook.get_conn() as ssh_client:
                 # Auto apply tty when its required in case of sudo

tests/contrib/operators/test_ssh_operator.py

@@ -7,9 +7,9 @@
 # to you under the Apache License, Version 2.0 (the
 # "License"); you may not use this file except in compliance
 # with the License.  You may obtain a copy of the License at
-# 
+#
 #   http://www.apache.org/licenses/LICENSE-2.0
-# 
+#
 # Unless required by applicable law or agreed to in writing,
 # software distributed under the License is distributed on an
 # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
@@ -58,6 +58,23 @@ def setUp(self):
         self.hook = hook
         self.dag = dag
 
+    def test_hook_created_correctly(self):
+        TIMEOUT = 20
+        SSH_ID = "ssh_default"
+        task = SSHOperator(
+            task_id="test",
+            command="echo -n airflow",
+            dag=self.dag,
+            timeout=TIMEOUT,
+            ssh_conn_id="ssh_default"
+        )
+        self.assertIsNotNone(task)
+
+        task.execute(None)
+
+        self.assertEquals(TIMEOUT, task.ssh_hook.timeout)
+        self.assertEquals(SSH_ID, task.ssh_hook.ssh_conn_id)
+
     def test_json_command_execution(self):
         configuration.conf.set("core", "enable_xcom_pickling", "False")
         task = SSHOperator(