Add nso_show module for Cisco NSO (#34142)

* update version parsing and move requirements to nso_* modules

prepare for introduction of nso_show module that has other version
requirements than the existing nso_* modules.

* Add nso_show module for retreiving config from Cisco NSO

New module that supports getting configuration and operational data
from Cisco NSO.

lib/ansible/module_utils/network/nso/nso.py

@@ -159,6 +159,17 @@ class JsonRpc(object):
         resp, resp_json = self._write_call(payload)
         return resp_json['result']
 
+    def show_config(self, path, operational=False):
+        payload = {
+            'method': 'show_config',
+            'params': {
+                'path': path,
+                'result_as': 'json',
+                'with_oper': operational}
+        }
+        resp, resp_json = self._read_call(payload)
+        return resp_json['result']
+
     def run_action(self, th, path, params=None):
         if params is None:
             params = {}
@@ -481,16 +492,40 @@ def connect(params):
     return client
 
 
-def verify_version(client):
+def verify_version(client, required_versions=None):
+    if required_versions is None:
+        required_versions = [(4, 5), (4, 4, 3)]
+
     version_str = client.get_system_setting('version')
+    if not verify_version_str(version_str, required_versions):
+        supported_versions = ', '.join(
+            ['.'.join([str(p) for p in required_version])
+             for required_version in required_versions])
+        raise ModuleFailException(
+            'unsupported NSO version {0}. {1} or later supported'.format(
+                version_str, supported_versions))
+
+
+def verify_version_str(version_str, required_versions):
     version = [int(p) for p in version_str.split('.')]
     if len(version) < 2:
         raise ModuleFailException(
             'unsupported NSO version format {0}'.format(version_str))
-    if (version[0] < 4 or version[1] < 4 or
-            (version[1] == 4 and (len(version) < 3 or version[2] < 3))):
-        raise ModuleFailException(
-            'unsupported NSO version {0}, only 4.4.3 or later is supported'.format(version_str))
+
+    def check_version(required_version, version):
+        for pos in range(len(required_version)):
+            if pos >= len(version):
+                return False
+            if version[pos] > required_version[pos]:
+                return True
+            if version[pos] < required_version[pos]:
+                return False
+        return True
+
+    for required_version in required_versions:
+        if check_version(required_version, version):
+            return True
+    return False
 
 
 def normalize_value(expected_value, value, key):

lib/ansible/modules/network/nso/nso_action.py

@@ -36,6 +36,8 @@ short_description: Executes Cisco NSO actions and verifies output.
 description:
   - This module provices support for executing Cisco NSO actions and then
     verifying that the output is as expected.
+requirements:
+  - Cisco NSO version 4.4.3 or higher.
 author: "Claes Nästén (@cnasten)"
 options:
   path:

lib/ansible/modules/network/nso/nso_config.py

@@ -36,6 +36,8 @@ short_description: Manage Cisco NSO configuration and service synchronization.
 description:
   - This module provides support for managing configuration in Cisco NSO and
     can also ensure services are in sync.
+requirements:
+  - Cisco NSO version 4.4.3 or higher.
 author: "Claes Nästén (@cnasten)"
 options:
   data:

lib/ansible/modules/network/nso/nso_show.py

@@ -0,0 +1,129 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Copyright (c) 2017 Cisco and/or its affiliates.
+#
+# 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/>.
+#
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+ANSIBLE_METADATA = {
+    'metadata_version': '1.1',
+    'status': ['preview'],
+    'supported_by': 'community'
+}
+
+DOCUMENTATION = '''
+---
+module: nso_show
+extends_documentation_fragment: nso
+short_description: Displays data from Cisco NSO.
+description:
+  - This module provides support for displaying data from Cisco NSO.
+requirements:
+  - Cisco NSO version 3.4.12 or higher, 4.1.9 or higher, 4.2.6 or higher,
+    4.3.7 or higher, 4.4.5 or higher, 4.5 or higher.
+author: "Claes Nästén (@cnasten)"
+options:
+  path:
+    description: Path to NSO data.
+    required: true
+  operational:
+    description: >
+      Controls wheter or not operational data is included in the result.
+version_added: "2.5"
+'''
+
+EXAMPLES = '''
+- name: Show devices including operational data
+  nso_show:
+    url: http://localhost:8080/jsonrpc
+    username: username
+    password: password
+    path: /ncs:devices/device
+    operational: true
+'''
+
+RETURN = '''
+output:
+  description: Configuration
+  returned: success
+  type: dict
+'''
+
+from ansible.module_utils.network.nso.nso import connect, verify_version, nso_argument_spec
+from ansible.module_utils.network.nso.nso import ModuleFailException, NsoException
+from ansible.module_utils.basic import AnsibleModule
+
+
+class NsoShow(object):
+    REQUIRED_VERSIONS = [
+        (4, 5),
+        (4, 4, 5),
+        (4, 3, 7),
+        (4, 2, 6),
+        (4, 1, 9),
+        (3, 4, 12)
+    ]
+
+    def __init__(self, check_mode, client, path, operational):
+        self._check_mode = check_mode
+        self._client = client
+        self._path = path
+        self._operational = operational
+
+    def main(self):
+        if self._check_mode:
+            return {}
+        else:
+            return self._client.show_config(self._path, self._operational)
+
+
+def main():
+    argument_spec = dict(
+        path=dict(required=True, type='str'),
+        operational=dict(required=False, type='bool', default=False)
+    )
+    argument_spec.update(nso_argument_spec)
+
+    module = AnsibleModule(
+        argument_spec=argument_spec,
+        supports_check_mode=True
+    )
+    p = module.params
+
+    client = connect(p)
+    nso_show = NsoShow(
+        module.check_mode, client,
+        p['path'], p['operational'])
+    try:
+        verify_version(client, NsoShow.REQUIRED_VERSIONS)
+
+        output = nso_show.main()
+        client.logout()
+        module.exit_json(changed=False, output=output)
+    except NsoException as ex:
+        client.logout()
+        module.fail_json(msg=ex.message)
+    except ModuleFailException as ex:
+        client.logout()
+        module.fail_json(msg=ex.message)
+
+
+if __name__ == '__main__':
+    main()

lib/ansible/modules/network/nso/nso_verify.py

@@ -36,6 +36,8 @@ short_description: Verifies Cisco NSO configuration.
 description:
   - This module provides support for verifying Cisco NSO configuration is in
     compliance with specified values.
+requirements:
+  - Cisco NSO version 4.4.3 or higher.
 author: "Claes Nästén (@cnasten)"
 options:
   data:

lib/ansible/utils/module_docs_fragments/nso.py

@@ -22,8 +22,6 @@
 class ModuleDocFragment(object):
 
     DOCUMENTATION = '''
-notes:
-  - Cisco NSO version 4.4.3 or higher required.
 options:
   url:
     description: NSO JSON-RPC URL, http://localhost:8080/jsonrpc
@@ -34,6 +32,4 @@ options:
   password:
     description: NSO password
     required: true
-requirements:
-  - Cisco NSO version 4.4.3 or higher
 '''