etcd.py module improved . added posibility to configure from playbook… (#18580)

* etcd.py module improved . added posibility to configure from playbook etcd server to query

* Update playbooks_lookups.rst

documented etcd lookups

* Update playbooks_lookups.rst

* Update playbooks_lookups.rst

* Update playbooks_lookups.rst

* Update playbooks_lookups.rst

* Update playbooks_lookups.rst

* Fixed errors reported by ansibot

* Update playbooks_lookups.rst

* Update playbooks_lookups.rst

* Copy edits.

lib/ansible/plugins/lookup/etcd.py

@@ -1,4 +1,5 @@
 # (c) 2013, Jan-Piet Mens <jpmens(at)gmail.com>
+# (m) 2016, Mihai Moldovanu <mihaim@tfm.ro>
 # (m) 2017, Juan Manuel Parrilla <jparrill@redhat.com>
 #
 # This file is part of Ansible
@@ -78,6 +79,29 @@ from ansible.plugins.lookup import LookupBase
 from ansible.module_utils.urls import open_url
 
 # this can be made configurable, not should not use ansible.cfg
+#
+# Made module configurable from playbooks:
+# If etcd  v2 running on host 192.168.1.21 on port 2379
+# we can use the following in a playbook to retrieve /tfm/network/config key
+#
+# - debug: msg={{lookup('etcd','/tfm/network/config', url='http://192.168.1.21:2379' , version='v2')}}
+#
+# Example Output:
+#
+# TASK [debug] *******************************************************************
+# ok: [localhost] => {
+#     "msg": {
+#         "Backend": {
+#             "Type": "vxlan"
+#         },
+#         "Network": "172.30.0.0/16",
+#         "SubnetLen": 24
+#     }
+# }
+#
+#
+#
+#
 ANSIBLE_ETCD_URL = 'http://127.0.0.1:4001'
 if os.getenv('ANSIBLE_ETCD_URL') is not None:
     ANSIBLE_ETCD_URL = os.environ['ANSIBLE_ETCD_URL']
@@ -148,8 +172,10 @@ class LookupModule(LookupBase):
     def run(self, terms, variables, **kwargs):
 
         validate_certs = kwargs.get('validate_certs', True)
+        url = kwargs.get('url', '')
+        version = kwargs.get('version', '')
 
-        etcd = Etcd(validate_certs=validate_certs)
+        etcd = Etcd(url=url, version=version, validate_certs=validate_certs)
 
         ret = []
         for term in terms: