initial add of junos_command module

This adds a new module, junos_command that can be used for sending commands
to Juniper JUNOS based devices.   The junos_command module is implemented
over a cli transport

lib/ansible/modules/network/junos/junos_command.py

@@ -0,0 +1,269 @@
+#!/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: junos_command
+version_added: "2.1"
+author: "Peter sprygada (@privateip)"
+short_description: Execute arbitrary commands on Juniper JUNOS devices
+description:
+  - Netork devices running Juniper JUNOS can execute a variety of commands
+    to display both configuration and state data.  This module will take
+    an ordered set of commands and execute them in JUNOS and return the
+    command results.  It also supports adding conditionals the
+    argument set to force the module to meet a set of criteria before
+    proceeding.
+extends_documentation_fragment: junos
+options:
+  commands:
+    description:
+      - The commands to send to the remote JUNOS device over the
+        configured provider.  The resulting output from the command
+        is returned.  If the I(waitfor) argument is provided, the
+        module is not returned until the condition is satisfied or
+        the number of retires as expired.
+    required: true
+  waitfor:
+    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
+  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 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 = """
+# the required set of connection arguments have been purposely left off
+# the examples for brevity
+
+- name: run a set of commands
+  junos_command:
+    commands: ['show version', 'show ip route']
+
+- name: run a command with a conditional applied to the second command
+  junos_command:
+    commands:
+      - show version
+      - show interfaces fxp0 | display json
+    waitfor:
+      - "result[1].interface-information[0].physical-interface[0].name[0].data
+        eq fxp0"
+"""
+
+RETURN = """
+stdout:
+  description: The output from the commands read from the device
+  returned: always
+  type: list
+  sample: ['...', '...']
+
+stdout_lines:
+  description: The output read from the device split into lines
+  returned: always
+  type: list
+  sample: [['...', '...'], ['...', '...']]
+
+failed_conditionals:
+  description: the conditionals that failed
+  retured: failed
+  type: list
+  sample: ['...', '...']
+"""
+
+import time
+import shlex
+import re
+import json
+import itertools
+
+INDEX_RE = re.compile(r'(\[\d+\])')
+
+class Conditional(object):
+
+    OPERATORS = {
+        'eq': ['eq', '=='],
+        'neq': ['neq', 'ne', '!='],
+        'gt': ['gt', '>'],
+        'ge': ['ge', '>='],
+        'lt': ['lt', '<'],
+        'le': ['le', '<='],
+        'contains': ['contains', 'in']
+    }
+
+    def __init__(self, conditional):
+        self.raw = conditional
+
+        key, op, val = shlex.split(conditional)
+        self.key = key
+        self.func = self.func(op)
+        self.value = self._cast_value(val)
+
+    def __call__(self, data):
+        try:
+            value = self.get_value(dict(result=data))
+            return self.func(value)
+        except Exception:
+            raise
+
+    def _cast_value(self, value):
+        if value in BOOLEANS_TRUE:
+            return True
+        elif value in BOOLEANS_FALSE:
+            return False
+        elif re.match(r'^\d+\.d+$', value):
+            return float(value)
+        elif re.match(r'^\d+$', value):
+            return int(value)
+        else:
+            return unicode(value)
+
+    def func(self, oper):
+        for func, operators in self.OPERATORS.items():
+            if oper in operators:
+                return getattr(self, func)
+        raise AttributeError('unknown operator: %s' % oper)
+
+    def get_value(self, result):
+        for key in self.key.split('.'):
+            match = re.match(r'^(.+)\[(\d+)\]', key)
+            if match:
+                key, index = match.groups()
+                result = result[key][int(index)]
+            else:
+                result = result.get(key)
+        return result
+
+    def number(self, value):
+        if '.' in str(value):
+            return float(value)
+        else:
+            return int(value)
+
+    def eq(self, value):
+        return value == self.value
+
+    def neq(self, value):
+        return value != self.value
+
+    def gt(self, value):
+        return self.number(value) > self.value
+
+    def ge(self, value):
+        return self.number(value) >= self.value
+
+    def lt(self, value):
+        return self.number(value) < self.value
+
+    def le(self, value):
+        return self.number(value) <= self.value
+
+    def contains(self, value):
+        return self.value in value
+
+def parse_response(module, responses):
+    commands = module.params['commands']
+    result = dict(stdout_json=list(), stdout=list(), stdout_lines=list())
+    for cmd, resp in itertools.izip(commands, responses):
+        result['stdout'].append(resp)
+        if cmd.endswith('json'):
+            result['stdout_json'].append(module.jsonify(resp))
+        else:
+            result['stdout_lines'].append(resp.split('\n'))
+    return result
+
+def main():
+    spec = dict(
+        commands=dict(type='list'),
+        waitfor=dict(type='list'),
+        retries=dict(default=10, type='int'),
+        interval=dict(default=1, type='int')
+    )
+
+    module = get_module(argument_spec=spec,
+                        supports_check_mode=True)
+
+
+    commands = module.params['commands']
+
+    retries = module.params['retries']
+    interval = module.params['interval']
+
+    try:
+        queue = set()
+        for entry in (module.params['waitfor'] or list()):
+            queue.add(Conditional(entry))
+    except AttributeError, exc:
+        module.fail_json(msg=exc.message)
+
+    result = dict(changed=False, stdout=list(), stdout_lines=list())
+
+    while retries > 0:
+        try:
+            response = module.execute(commands)
+        except ShellError:
+            module.fail_json(msg='failed to run commands')
+
+        values = list()
+        for index, cmd in enumerate(commands):
+            if cmd.endswith('json'):
+                values.append(module.from_json(response[index]))
+            else:
+                values.append(response[index])
+
+        for item in list(queue):
+            if item(values):
+                queue.remove(item)
+
+        if not queue:
+            break
+
+        time.sleep(interval)
+        retries -= 1
+    else:
+        failed_conditions = [item.raw for item in queue]
+        module.fail_json(msg='timeout waiting for value', failed_conditions=failed_conditions)
+
+    result.update(parse_response(module, response))
+    return module.exit_json(**result)
+
+
+from ansible.module_utils.basic import *
+from ansible.module_utils.shell import *
+from ansible.module_utils.junos import *
+if __name__ == '__main__':
+        main()
+