new module nxos_system (#21627)

* provides declarative config support for nxos system attributes
* adds unit test cases for new module

lib/ansible/modules/network/nxos/nxos_system.py

@@ -0,0 +1,359 @@
+#!/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/>.
+#
+
+ANSIBLE_METADATA = {
+    'status': ['preview'],
+    'supported_by': 'core',
+    'version': '1.0'
+}
+
+DOCUMENTATION = """
+---
+module: nxos_system
+version_added: "2.3"
+author: "Peter Sprygada (@privateip)"
+short_description: Manage the system attributes on Cisco NXOS devices
+description:
+  - This module provides declarative management of node system attributes
+    on Cisco NXOS devices.  It provides an option to configure host system
+    parameters or remove those parameters from the device active
+    configuration.
+options:
+  hostname:
+    description:
+      - The C(hostname) argument will configure the device hostname
+        parameter on Cisco NXOS devices.  The C(hostname) value is an
+        ASCII string value.
+    required: false
+    default: null
+  domain_lookup:
+    description:
+      - The C(domain_lookup) argument enables or disables the DNS
+        lookup feature in Cisco NXOS.  This argument accepts boolean
+        values.  When enabled, the system will try to resolve hostnames
+        using DNS and when disabled, hostnames will not be resolved.
+    required: false
+    default: null
+  domain_search:
+    description:
+      - The C(domain_search) argument configures a list of domain
+        name suffixes to search when performing DNS name resolution.
+        This argument accepts either a list of domain names or
+        a list of dicts that configure the domain name and VRF name.  See
+        examples.
+    required: false
+    default: null
+  domain_name:
+    description:
+      - The C(domain_name) argument configures the default domain
+        name suffix to be used when referencing this node by its
+        FQDN.  This argument accepts either a list of domain names or
+        a list of dicts that configure the domain name and VRF name.  See
+        examples.
+    required: false
+    default: null
+  name_servers:
+    description:
+      - The C(name_servers) argument accepts a list of DNS name servers by
+        way of either FQDN or IP address to use to perform name resolution
+        lookups.  This argument accepts wither a list of DNS servers or
+        a list of hashes that configure the name server and VRF name.  See
+        examples.
+    required: false
+    default: null
+  state:
+    description:
+      - The C(state) argument configures the state of the configuration
+        values in the device's current active configuration.  When set
+        to I(present), the values should be configured in the device active
+        configuration and when set to I(absent) the values should not be
+        in the device active configuration
+    required: false
+    default: present
+    choices: ['present', 'absent']
+"""
+
+EXAMPLES = """
+- name: configure hostname and domain-name
+  nxos_system:
+    hostname: nxos01
+    domain_name: eng.ansible.com
+
+- name: remove configuration
+  nxos_system:
+    state: absent
+
+- name: configure DNS lookup sources
+  nxos_system:
+    lookup_source: Management1
+
+- name: configure name servers
+  nxos_system:
+    name_servers:
+      - 8.8.8.8
+      - 8.8.4.4
+
+- name: configure name servers with VRF support
+  nxos_system:
+    name_servers:
+      - { server: 8.8.8.8, vrf: mgmt }
+      - { server: 8.8.4.4, vrf: mgmt }
+"""
+
+RETURN = """
+commands:
+  description: The list of configuration mode commands to send to the device
+  returned: always
+  type: list
+  sample:
+    - hostname nxos01
+    - ip domain-name eng.ansible.com
+"""
+import re
+
+from ansible.module_utils.nxos import get_config, load_config
+from ansible.module_utils.nxos import nxos_argument_spec, check_args
+from ansible.module_utils.basic import AnsibleModule
+from ansible.module_utils.six import iteritems
+from ansible.module_utils.netcfg import NetworkConfig
+from ansible.module_utils.network_common import ComplexList
+
+_CONFIGURED_VRFS = None
+
+def has_vrf(module, vrf):
+    global _CONFIGURED_VRFS
+    if _CONFIGURED_VRFS is not None:
+        return vrf in _CONFIGURED_VRFS
+    config = get_config(module)
+    _CONFIGURED_VRFS = re.findall('vrf context (\S+)', config)
+    return vrf in _CONFIGURED_VRFS
+
+def map_obj_to_commands(want, have, module):
+    commands = list()
+    state = module.params['state']
+
+    needs_update = lambda x: want.get(x) and (want.get(x) != have.get(x))
+    difference = lambda x,y,z: [item for item in x[z] if item not in y[z]]
+
+    def remove(cmd, commands, vrf=None):
+        if vrf:
+            commands.append('vrf context %s' % vrf)
+        commands.append(cmd)
+        if vrf:
+            commands.append('exit')
+
+    def add(cmd, commands, vrf=None):
+        if vrf:
+            if not has_vrf(module, vrf):
+                module.fail_json(msg='invalid vrf name %s' % vrf)
+        return remove(cmd, commands, vrf)
+
+    if state == 'absent':
+        if have['hostname']:
+            commands.append('no hostname')
+
+        for item in have['domain_name']:
+            cmd = 'no ip domain-name %s' % item['name']
+            remove(cmd, commands, item['vrf'])
+
+        for item in have['domain_search']:
+            cmd = 'no ip domain-list %s' % item['name']
+            remove(cmd, commands, item['vrf'])
+
+        for item in have['name_servers']:
+            cmd = 'no ip name-server %s' % item['server']
+            remove(cmd, commands, item['vrf'])
+
+    if state == 'present':
+        if needs_update('hostname'):
+            commands.append('hostname %s' % want['hostname'])
+
+        if needs_update('domain_lookup'):
+            cmd = 'ip domain-lookup'
+            if want['domain_lookup'] is False:
+                cmd = 'no %s' % cmd
+            commands.append(cmd)
+
+        if want['domain_name']:
+            for item in difference(have, want, 'domain_name'):
+                cmd = 'no ip domain-name %s' % item['name']
+                remove(cmd, commands, item['vrf'])
+            for item in difference(want, have, 'domain_name'):
+                cmd = 'ip domain-name %s' % item['name']
+                add(cmd, commands, item['vrf'])
+
+        if want['domain_search']:
+            for item in difference(have, want, 'domain_search'):
+                cmd = 'no ip domain-list %s' % item['name']
+                remove(cmd, commands, item['vrf'])
+            for item in difference(want, have, 'domain_search'):
+                cmd = 'ip domain-list %s' % item['name']
+                add(cmd, commands, item['vrf'])
+
+        if want['name_servers']:
+            for item in difference(have, want, 'name_servers'):
+                cmd = 'no ip name-server %s' %  item['server']
+                remove(cmd, commands, item['vrf'])
+            for item in difference(want, have, 'name_servers'):
+                cmd = 'ip name-server %s' % item['server']
+                add(cmd, commands, item['vrf'])
+
+    return commands
+
+def parse_hostname(config):
+    match = re.search('^hostname (\S+)', config, re.M)
+    if match:
+        return match.group(1)
+
+def parse_domain_name(config, vrf_config):
+    objects = list()
+    regex = re.compile('ip domain-name (\S+)')
+
+    match = regex.search(config, re.M)
+    if match:
+        objects.append({'name': match.group(1), 'vrf': None})
+
+    for vrf, cfg in iteritems(vrf_config):
+        match = regex.search(cfg, re.M)
+        if match:
+            objects.append({'name': match.group(1), 'vrf': vrf})
+
+    return objects
+
+def parse_domain_search(config, vrf_config):
+    objects = list()
+
+    for item in re.findall('^ip domain-list (\S+)', config, re.M):
+        objects.append({'name': item, 'vrf': None})
+
+    for vrf, cfg in iteritems(vrf_config):
+        for item in re.findall('ip domain-list (\S+)', cfg, re.M):
+            objects.append({'name': item, 'vrf': vrf})
+
+    return objects
+
+def parse_name_servers(config, vrf_config):
+    objects = list()
+
+    match = re.search('^ip name-server (.+)$', config, re.M)
+    if match:
+        for addr in match.group(1).split(' '):
+            objects.append({'server': addr, 'vrf': None})
+
+    for vrf, cfg in iteritems(vrf_config):
+        for item in re.findall('ip name-server (\S+)', cfg, re.M):
+            for addr in match.group(1).split(' '):
+                objects.append({'server': addr, 'vrf': vrf})
+
+    return objects
+
+def map_config_to_obj(module):
+    config = get_config(module)
+    configobj = NetworkConfig(indent=2, contents=config)
+
+    vrf_config = {}
+
+    vrfs = re.findall('^vrf context (\S+)$', config, re.M)
+    for vrf in vrfs:
+        config_data = configobj.get_block_config(path=['vrf context %s' % vrf])
+        vrf_config[vrf] = config_data
+
+    return {
+        'hostname': parse_hostname(config),
+        'domain_lookup': 'no ip domain-lookup' not in config,
+        'domain_name': parse_domain_name(config, vrf_config),
+        'domain_search': parse_domain_search(config, vrf_config),
+        'name_servers': parse_name_servers(config, vrf_config)
+    }
+
+def map_params_to_obj(module):
+    obj = {
+        'hostname': module.params['hostname'],
+        'domain_lookup': module.params['domain_lookup'],
+    }
+
+    domain_name = ComplexList(dict(
+        name=dict(key=True),
+        vrf=dict()
+    ), module)
+
+    domain_search = ComplexList(dict(
+        name=dict(key=True),
+        vrf=dict()
+    ), module)
+
+    name_servers = ComplexList(dict(
+        server=dict(key=True),
+        vrf=dict()
+    ), module)
+
+    for arg, cast in [('domain_name', domain_name), ('domain_search', domain_search),
+                      ('name_servers', name_servers)]:
+        if module.params[arg] is not None:
+            obj[arg] = cast(module.params[arg])
+        else:
+            obj[arg] = None
+
+    return obj
+
+def main():
+    """ main entry point for module execution
+    """
+    argument_spec = dict(
+        hostname=dict(),
+        domain_lookup=dict(type='bool'),
+
+        # { name: <str>, vrf: <str> }
+        domain_name=dict(type='list'),
+
+        # {name: <str>, vrf: <str> }
+        domain_search=dict(type='list'),
+
+        # { server: <str>; vrf: <str> }
+        name_servers=dict(type='list'),
+
+        state=dict(default='present', choices=['present', 'absent'])
+    )
+
+    argument_spec.update(nxos_argument_spec)
+
+    module = AnsibleModule(argument_spec=argument_spec,
+                           supports_check_mode=True)
+
+    warnings = list()
+    check_args(module, warnings)
+
+    result = {'changed': False}
+    if warnings:
+        result['warnings'] = warnings
+
+    want = map_params_to_obj(module)
+    have = map_config_to_obj(module)
+
+    commands = map_obj_to_commands(want, have, module)
+    result['commands'] = commands
+
+    if commands:
+        if not module.check_mode:
+            load_config(module, commands)
+        result['changed'] = True
+
+    module.exit_json(**result)
+
+if __name__ == '__main__':
+    main()