initial commit of vyos_command module

This adds a new module, vyos_command for sending CLI commands to remote
devices running VyOS operating system.

network/vyos/vyos_command.py

@@ -0,0 +1,195 @@
+#!/usr/bin/python
+#
+# This file is part of Ansible
+#
+# Ansible is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ansible is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+DOCUMENTATION = """
+---
+module: vyos_command
+version_added: "2.2"
+author: "Peter Sprygada (@privateip)"
+short_description: Run one or more commands on VyOS devices
+description:
+  - The command module allows running one or more commands on remote
+    devices running VyOS.  The mdoule commands can also be introspected
+    to validate key parameters before returning successfully.  If the
+    conditional statements are not met in the wait period, the task
+    fails.
+extends_documentation_fragment: vyos
+options:
+  commands:
+    description:
+      - The ordered set of commands to execute on the remote device
+        running VyOS.  The output from the command execution is
+        returned to the playbook.  If the I(wait_for) argument is
+        provided, the module is not returned until the condition is
+        satistifed or the number of retries has been exceeded.
+    required: true
+  wait_for:
+    description:
+      - Specifies what to evaluate from the output of the command
+        and what conditionals to apply.  This argument will cause
+        the task to wait for a particular conditional to be true
+        before moving forward.   If the conditional is not true
+        by the configured retries, the task fails.  See examples.
+    required: false
+    default: null
+    aliases: ['waitfor']
+  retries:
+    description:
+      - Specifies the number of retries a command should be tried
+        before it is considered failed.  The command is run on the
+        target device every retry and evaluated against the waitfor
+        conditionals
+    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
+        conditional, the interval indicates how to 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 }}"
+    username: vyos
+    password: vyos
+    transport: cli
+
+- vyos_command:
+    commands:
+        - show interfaces ethernet {{ item }}
+    provider: "{{ cli }}"
+  with_items:
+    - eth0
+    - eth1
+
+- vyos_command:
+    commands:
+      - show version
+      - show hardware cpu
+    wait_for:
+      - "result[0] contains 'VyOS 1.1.7'"
+    provider: "{{ cli }}"
+"""
+
+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
+  retured: failed
+  type: list
+  sample: ['...', '...']
+warnings:
+  description: The list of warnings (if any) generated by module based on arguments
+  returned: always
+  type: list
+  sample: ['...', '...']
+"""
+from ansible.module_utils.netcmd import CommandRunner, FailedConditionsError
+from ansible.module_utils.vyos import NetworkModule, NetworkError
+from ansible.module_utils.vyos import vyos_argument_spec, get_exception
+
+def to_lines(stdout):
+    for item in stdout:
+        if isinstance(item, basestring):
+            item = str(item).split('\n')
+        yield item
+
+def main():
+    """Main entry point for Ansible module execution
+    """
+    argument_spec = dict(
+        commands=dict(type='list'),
+        wait_for=dict(type='list', aliases=['waitfor']),
+
+        retries=dict(default=10, type='int'),
+        interval=dict(default=1, type='int')
+    )
+
+    module = NetworkModule(argument_spec=argument_spec,
+                           connect_on_load=False,
+                           supports_check_mode=True)
+
+
+    commands = module.params['commands']
+    conditionals = module.params['wait_for'] or list()
+
+    warnings = list()
+
+    runner = CommandRunner(module)
+
+    for cmd in commands:
+        if module.check_mode and not cmd.startswith('show'):
+            warnings.append('only show commands are supported when using '
+                            'check mode, not executing `%s`' % cmd)
+        else:
+            if cmd.startswith('conf'):
+                module.fail_json(msg='vyos_command does not support running '
+                                     'config mode commands.  Please use '
+                                     'vyos_config instead')
+            runner.add_command(cmd)
+
+    for item in conditionals:
+        runner.add_conditional(item)
+
+    runner.retries = module.params['retries']
+    runner.interval = module.params['interval']
+
+    try:
+        runner.run()
+    except FailedConditionsError:
+        exc = get_exception()
+        module.fail_json(msg=str(exc), failed_conditions=exc.failed_conditions)
+    except NetworkError:
+        exc = get_exception()
+        module.fail_json(msg=str(exc))
+
+    result = dict(changed=False, warnings=warnings)
+
+    result['stdout'] = list()
+    for cmd in commands:
+        try:
+            output = runner.get_command(cmd)
+        except ValueError:
+            output = 'command not executed due to check_mode, see warnings'
+        result['stdout'].append(output)
+
+    result['warnings'] = warnings
+    result['stdout_lines'] = list(to_lines(result['stdout']))
+
+    module.exit_json(**result)
+
+
+if __name__ == '__main__':
+    main()
+