Adding enos_command module and unit test (#32782)

* Adding git_command module and its UT file

* Changing Author Name and removing 2 blank lines

* Removing blank lines

* Adding enos_config and its UT files

* Removing config module as I am allowed to have only module per PR

* Work on Ganesh's Review comments

* John Review Comments on enos_command.py

* Review comments of John

lib/ansible/modules/network/enos/enos_command.py

@@ -0,0 +1,219 @@
+#!/usr/bin/python
+#
+# Copyright (C) 2017 Lenovo, Inc.
+# GNU General Public License v3.0+
+# (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+ANSIBLE_METADATA = {'metadata_version': '1.1',
+                    'status': ['preview'],
+                    'supported_by': 'community'}
+
+
+DOCUMENTATION = """
+---
+module: enos_command
+version_added: "2.5"
+author: "Anil Kumar Muraleedharan (@amuraleedhar)"
+short_description: Run arbitrary commands on Lenovo ENOS devices
+description:
+  - Sends arbitrary commands to an ENOS node and returns the results
+    read from the device. The C(enos_command) module includes an
+    argument that will cause the module to wait for a specific condition
+    before returning or timing out if the condition is not met.
+extends_documentation_fragment: enos
+options:
+  commands:
+    description:
+      - List of commands to send to the remote device over the
+        configured provider. The resulting output from the command
+        is returned. If the I(wait_for) argument is provided, the
+        module is not returned until the condition is satisfied or
+        the number of retires as expired.
+    required: true
+  wait_for:
+    description:
+      - List of conditions to evaluate against the output of the
+        command. The task will wait for each condition to be true
+        before moving forward. If the conditional is not true
+        within the configured number of retries, the task fails.
+        See examples.
+    required: false
+    default: null
+  match:
+    description:
+      - The I(match) argument is used in conjunction with the
+        I(wait_for) argument to specify the match policy.  Valid
+        values are C(all) or C(any).  If the value is set to C(all)
+        then all conditionals in the wait_for must be satisfied.  If
+        the value is set to C(any) then only one of the values must be
+        satisfied.
+    required: false
+    default: all
+    choices: ['any', 'all']
+  retries:
+    description:
+      - Specifies the number of retries a command should by tried
+        before it is considered failed. The command is run on the
+        target device every retry and evaluated against the
+        I(wait_for) conditions.
+    required: false
+    default: 10
+  interval:
+    description:
+      - Configures the interval in seconds to wait between retries
+        of the command. If the command does not pass the specified
+        conditions, the interval indicates how long to wait before
+        trying the command again.
+    required: false
+    default: 1
+"""
+
+EXAMPLES = """
+# Note: examples below use the following provider dict to handle
+#       transport and authentication to the node.
+---
+vars:
+  cli:
+    host: "{{ inventory_hostname }}"
+    port: 22
+    username: admin
+    password: admin
+    timeout: 30
+
+---
+- name: test contains operator
+  enos_command:
+    commands:
+      - show version
+      - show system memory
+    wait_for:
+      - "result[0] contains 'Lenovo'"
+      - "result[1] contains 'MemFree'"
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == false"
+      - "result.stdout is defined"
+
+- name: get output for single command
+  enos_command:
+    commands: ['show version']
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == false"
+      - "result.stdout is defined"
+
+- name: get output for multiple commands
+  enos_command:
+    commands:
+      - show version
+      - show interface information
+    provider: "{{ cli }}"
+  register: result
+
+- assert:
+    that:
+      - "result.changed == false"
+      - "result.stdout is defined"
+      - "result.stdout | length == 2"
+"""
+
+RETURN = """
+stdout:
+  description: the set of responses from the commands
+  returned: always
+  type: list
+  sample: ['...', '...']
+stdout_lines:
+  description: The value of stdout split into a list
+  returned: always
+  type: list
+  sample: [['...', '...'], ['...'], ['...']]
+failed_conditions:
+  description: the conditionals that failed
+  returned: failed
+  type: list
+  sample: ['...', '...']
+"""
+
+import time
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.enos import run_commands, check_args
+from ansible.module_utils.enos import enos_argument_spec
+from ansible.module_utils.netcli import Conditional
+from ansible.module_utils.six import string_types
+
+
+def to_lines(stdout):
+    for item in stdout:
+        if isinstance(item, string_types):
+            item = str(item).split('\n')
+        yield item
+
+
+def main():
+    spec = dict(
+        # { command: <str>, prompt: <str>, response: <str> }
+        commands=dict(type='list', required=True),
+
+        wait_for=dict(type='list'),
+        match=dict(default='all', choices=['all', 'any']),
+
+        retries=dict(default=10, type='int'),
+        interval=dict(default=1, type='int')
+    )
+
+    spec.update(enos_argument_spec)
+
+    module = AnsibleModule(argument_spec=spec, supports_check_mode=True)
+    result = {'changed': False}
+
+    wait_for = module.params['wait_for'] or list()
+    conditionals = [Conditional(c) for c in wait_for]
+
+    commands = module.params['commands']
+    retries = module.params['retries']
+    interval = module.params['interval']
+    match = module.params['match']
+
+    while retries > 0:
+        responses = run_commands(module, commands)
+
+        for item in list(conditionals):
+            if item(responses):
+                if match == 'any':
+                    conditionals = list()
+                    break
+                conditionals.remove(item)
+
+        if not conditionals:
+            break
+
+        time.sleep(interval)
+        retries -= 1
+
+    if conditionals:
+        failed_conditions = [item.raw for item in conditionals]
+        msg = 'One or more conditional statements have not be satisfied'
+        module.fail_json(msg=msg, failed_conditions=failed_conditions)
+
+    result.update({
+        'changed': False,
+        'stdout': responses,
+        'stdout_lines': list(to_lines(responses))
+    })
+
+    module.exit_json(**result)
+
+
+if __name__ == '__main__':
+    main()