#!/usr/bin/python # # (c) 2018, Jean-Philippe Evrard <jean-philippe@evrard.me> # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt) from __future__ import absolute_import, division, print_function __metaclass__ = type DOCUMENTATION = ''' --- module: etcd3 short_description: "Set or delete key value pairs from an etcd3 cluster" requirements: - etcd3 description: - Sets or deletes values in etcd3 cluster using its v3 api. - Needs python etcd3 lib to work options: key: description: - the key where the information is stored in the cluster required: true value: description: - the information stored required: true host: description: - the IP address of the cluster default: 'localhost' port: description: - the port number used to connect to the cluster default: 2379 state: description: - the state of the value for the key. - can be present or absent required: true choices: [ present, absent ] user: description: - The etcd user to authenticate with. password: description: - The password to use for authentication. - Required if I(user) is defined. ca_cert: description: - The Certificate Authority to use to verify the etcd host. - Required if I(client_cert) and I(client_key) are defined. client_cert: description: - PEM formatted certificate chain file to be used for SSL client authentication. - Required if I(client_key) is defined. client_key: description: - PEM formatted file that contains your private key to be used for SSL client authentication. - Required if I(client_cert) is defined. timeout: description: - The socket level timeout in seconds. author: - Jean-Philippe Evrard (@evrardjp) - Victor Fauth (@vfauth) ''' EXAMPLES = """ - name: Store a value "bar" under the key "foo" for a cluster located "http://localhost:2379" community.general.etcd3: key: "foo" value: "baz3" host: "localhost" port: 2379 state: "present" - name: Authenticate using user/password combination with a timeout of 10 seconds community.general.etcd3: key: "foo" value: "baz3" state: "present" user: "someone" password: "password123" timeout: 10 - name: Authenticate using TLS certificates community.general.etcd3: key: "foo" value: "baz3" state: "present" ca_cert: "/etc/ssl/certs/CA_CERT.pem" client_cert: "/etc/ssl/certs/cert.crt" client_key: "/etc/ssl/private/key.pem" """ RETURN = ''' key: description: The key that was queried returned: always type: str old_value: description: The previous value in the cluster returned: always type: str ''' import traceback from ansible.module_utils.basic import AnsibleModule, missing_required_lib from ansible.module_utils._text import to_native try: import etcd3 HAS_ETCD = True except ImportError: ETCD_IMP_ERR = traceback.format_exc() HAS_ETCD = False def run_module(): # define the available arguments/parameters that a user can pass to # the module module_args = dict( key=dict(type='str', required=True), value=dict(type='str', required=True), host=dict(type='str', default='localhost'), port=dict(type='int', default=2379), state=dict(type='str', required=True, choices=['present', 'absent']), user=dict(type='str'), password=dict(type='str', no_log=True), ca_cert=dict(type='path'), client_cert=dict(type='path'), client_key=dict(type='path'), timeout=dict(type='int'), ) # seed the result dict in the object # we primarily care about changed and state # change is if this module effectively modified the target # state will include any data that you want your module to pass back # for consumption, for example, in a subsequent task result = dict( changed=False, ) # the AnsibleModule object will be our abstraction working with Ansible # this includes instantiation, a couple of common attr would be the # args/params passed to the execution, as well as if the module # supports check mode module = AnsibleModule( argument_spec=module_args, supports_check_mode=True, required_together=[['client_cert', 'client_key'], ['user', 'password']], ) # It is possible to set `ca_cert` to verify the server identity without # setting `client_cert` or `client_key` to authenticate the client # so required_together is enough # Due to `required_together=[['client_cert', 'client_key']]`, checking the presence # of either `client_cert` or `client_key` is enough if module.params['ca_cert'] is None and module.params['client_cert'] is not None: module.fail_json(msg="The 'ca_cert' parameter must be defined when 'client_cert' and 'client_key' are present.") result['key'] = module.params.get('key') module.params['cert_cert'] = module.params.pop('client_cert') module.params['cert_key'] = module.params.pop('client_key') if not HAS_ETCD: module.fail_json(msg=missing_required_lib('etcd3'), exception=ETCD_IMP_ERR) allowed_keys = ['host', 'port', 'ca_cert', 'cert_cert', 'cert_key', 'timeout', 'user', 'password'] # TODO(evrardjp): Move this back to a dict comprehension when python 2.7 is # the minimum supported version # client_params = {key: value for key, value in module.params.items() if key in allowed_keys} client_params = dict() for key, value in module.params.items(): if key in allowed_keys: client_params[key] = value try: etcd = etcd3.client(**client_params) except Exception as exp: module.fail_json(msg='Cannot connect to etcd cluster: %s' % (to_native(exp)), exception=traceback.format_exc()) try: cluster_value = etcd.get(module.params['key']) except Exception as exp: module.fail_json(msg='Cannot reach data: %s' % (to_native(exp)), exception=traceback.format_exc()) # Make the cluster_value[0] a string for string comparisons result['old_value'] = to_native(cluster_value[0]) if module.params['state'] == 'absent': if cluster_value[0] is not None: if module.check_mode: result['changed'] = True else: try: etcd.delete(module.params['key']) except Exception as exp: module.fail_json(msg='Cannot delete %s: %s' % (module.params['key'], to_native(exp)), exception=traceback.format_exc()) else: result['changed'] = True elif module.params['state'] == 'present': if result['old_value'] != module.params['value']: if module.check_mode: result['changed'] = True else: try: etcd.put(module.params['key'], module.params['value']) except Exception as exp: module.fail_json(msg='Cannot add or edit key %s: %s' % (module.params['key'], to_native(exp)), exception=traceback.format_exc()) else: result['changed'] = True else: module.fail_json(msg="State not recognized") # manipulate or modify the state as needed (this is going to be the # part where your module will do what it needs to do) # during the execution of the module, if there is an exception or a # conditional state that effectively causes a failure, run # AnsibleModule.fail_json() to pass in the message and the result # in the event of a successful module execution, you will want to # simple AnsibleModule.exit_json(), passing the key/value results module.exit_json(**result) def main(): run_module() if __name__ == '__main__': main()