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# ============LICENSE_START====================================================
# org.onap.dcaegen2
# =============================================================================
# Copyright (c) 2017-2020 AT&T Intellectual Property. All rights reserved.
# Copyright (c) 2020 Pantheon.tech. All rights reserved.
# =============================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END======================================================
import requests
### "Constants"
FEEDS_PATH = '/feeds'
PUBS_PATH = '/dr_pubs'
SUBS_PATH = '/dr_subs'
TOPICS_PATH = '/topics'
CLIENTS_PATH = '/mr_clients'
LOCATIONS_PATH = '/dcaeLocations'
class DMaaPControllerHandle(object):
'''
A simple wrapper class to map DMaaP bus controller API calls into operations supported by the requests module
'''
def __init__(self, api_url, user, password, logger,
feeds_path = FEEDS_PATH,
pubs_path = PUBS_PATH,
subs_path = SUBS_PATH,
topics_path = TOPICS_PATH,
clients_path = CLIENTS_PATH):
'''
Constructor
'''
self.api_url = api_url # URL for the root of the Controller resource tree, no trailing "/"
self.auth = (user, password) # user name and password for HTTP basic auth
self.logger = logger
self.feeds_path = feeds_path
self.pubs_path = pubs_path
self.subs_path = subs_path
self.topics_path = topics_path
self.clients_path = clients_path
### INTERNAL FUNCTIONS ###
def _make_url(self, path):
'''
Make a full URL given the path relative to the root
'''
if not path.startswith('/'):
path = '/' + path
return self.api_url + path
def _get_resource(self, path):
'''
Get the DMaaP resource at path, where path is relative to the root.
'''
url = self._make_url(path)
self.logger.info("Querying URL: {0}".format(url))
return requests.get(url, auth=self.auth)
def _create_resource(self, path, resource_content):
'''
Create a DMaaP resource by POSTing to the resource collection
identified by path (relative to root), using resource_content as the body of the post
'''
url = self._make_url(path)
self.logger.info("Posting to URL: {0} with body: {1}".format(url, resource_content))
return requests.post(url, auth=self.auth, json=resource_content)
def _delete_resource(self, path):
'''
Delete the DMaaP resource at path, where path is relative to the root.
'''
url = self._make_url(path)
self.logger.info("Deleting URL: {0}".format(url))
return requests.delete(url, auth=self.auth)
### PUBLIC API ###
# Data Router Feeds
def create_feed(self, name, version=None, description=None, aspr_class=None, owner=None, useExisting=None):
'''
Create a DMaaP data router feed with the given feed name
and (optionally) feed version, feed description, ASPR classification,
owner, and useExisting flag
'''
feed_definition = {'feedName' : name}
if version:
feed_definition['feedVersion'] = version
if description:
feed_definition['feedDescription'] = description
if aspr_class:
feed_definition['asprClassification'] = aspr_class
if owner:
feed_definition['owner'] = owner
feeds_path_query = self.feeds_path
if useExisting == True: # It's a boolean!
feeds_path_query += "?useExisting=true"
return self._create_resource(feeds_path_query, feed_definition)
def get_feed_info(self, feed_id):
'''
Get the representation of the DMaaP data router feed whose feed id is feed_id.
'''
return self._get_resource("{0}/{1}".format(self.feeds_path, feed_id))
def get_feed_info_by_name(self, feed_name):
'''
Get the representation of the DMaaP data router feed whose feed name is feed_name.
'''
feeds = self._get_resource("{0}".format(self.feeds_path))
feed_list = feeds.json()
for feed in feed_list:
if feed["feedName"] == feed_name:
self.logger.info("Found feed with {0}".format(feed_name))
feed_id = feed["feedId"]
return self._get_resource("{0}/{1}".format(self.feeds_path, feed_id))
self.logger.info("feed_name {0} not found".format(feed_name))
return None
def delete_feed(self, feed_id):
'''
Delete the DMaaP data router feed whose feed id is feed_id.
'''
return self._delete_resource("{0}/{1}".format(self.feeds_path, feed_id))
# Data Router Publishers
def add_publisher(self, feed_id, location, username, password, status=None):
'''
Add a publisher to feed feed_id at location location with user, pass, and status
'''
publisher_definition = {
'feedId' : feed_id,
'dcaeLocationName' : location,
'username' : username,
'userpwd' : password
}
if status:
publisher_definition['status'] = status
return self._create_resource(self.pubs_path, publisher_definition)
def get_publisher_info(self, pub_id):
'''
Get the representation of the DMaaP data router publisher whose publisher id is pub_id
'''
return self._get_resource("{0}/{1}".format(self.pubs_path, pub_id))
def delete_publisher(self, pub_id):
'''
Delete the DMaaP data router publisher whose publisher id is id.
'''
return self._delete_resource("{0}/{1}".format(self.pubs_path, pub_id))
# Data Router SUbscrihers
def add_subscriber(self, feed_id, location, delivery_url, username, password, decompress, privileged, status=None):
'''
Add a publisher to feed feed_id at location location with user, pass, and status
'''
subscriber_definition = {
'feedId' : feed_id,
'dcaeLocationName' : location,
'deliveryURL' : delivery_url,
'username' : username,
'userpwd' : password,
'decompress': decompress,
'privilegedSubscriber': privileged
}
if status:
subscriber_definition['status'] = status
return self._create_resource(self.subs_path, subscriber_definition)
def get_subscriber_info(self, sub_id):
'''
Get the representation of the DMaaP data router subscriber whose subscriber id is sub_id
'''
return self._get_resource("{0}/{1}".format(self.subs_path, sub_id))
def delete_subscriber(self, sub_id):
'''
Delete the DMaaP data router subscriber whose subscriber id is sub_id.
'''
return self._delete_resource("{0}/{1}".format(self.subs_path, sub_id))
# Message router topics
def create_topic(self, name, description = None, txenable = None, owner = None, replication_case = None, global_mr_url = None, useExisting = None):
'''
Create a message router topic with the topic name 'name' and optionally the topic_description
'description', the 'txenable' flag, the 'useExisting' flag and the topic owner 'owner'.
'''
topic_definition = {'topicName' : name}
if description:
topic_definition['topicDescription'] = description
if owner:
topic_definition['owner'] = owner
if txenable != None: # It's a boolean!
topic_definition['txenable'] = txenable
if replication_case:
topic_definition['replicationCase'] = replication_case
if global_mr_url:
topic_definition['globalMrURL'] = global_mr_url
topics_path_query = self.topics_path
if useExisting == True: # It's a boolean!
topics_path_query += "?useExisting=true"
return self._create_resource(topics_path_query, topic_definition)
def get_topic_info(self, fqtn):
'''
Get information about the topic whose fully-qualified name is 'fqtn'
'''
return self._get_resource("{0}/{1}".format(self.topics_path, fqtn))
def get_topic_fqtn_by_name(self, topic_name):
'''
Get the representation of the DMaaP message router topic fqtn whose topic name is topic_name.
'''
topics = self._get_resource("{0}".format(self.topics_path))
topic_list = topics.json()
for topic in topic_list:
if topic["topicName"] == topic_name:
self.logger.info("Found existing topic with name {0}".format(topic_name))
fqtn = topic["fqtn"]
return fqtn
self.logger.info("topic_name {0} not found".format(topic_name))
return None
def delete_topic(self, fqtn):
'''
Delete the topic whose fully qualified name is 'fqtn'
'''
return self._delete_resource("{0}/{1}".format(self.topics_path, fqtn))
# Message route clients (publishers and subscribers
def create_client(self, fqtn, location, client_role, actions):
'''
Creates a client authorized to access the topic with fully-qualified name 'fqtn',
from the location 'location', using the AAF client role 'client_role'. The
client is authorized to perform actions in the list 'actions'. (Valid
values are 'pub', 'sub', and 'view'
'''
client_definition = {
'fqtn' : fqtn,
'dcaeLocationName' : location,
'clientRole' : client_role,
'action' : actions
}
return self._create_resource(self.clients_path, client_definition)
def get_client_info(self, client_id):
'''
Get client information for the client whose client ID is 'client_id'
'''
return self._get_resource("{0}/{1}".format(self.clients_path, client_id))
def delete_client(self, client_id):
'''
Delete the client whose client ID is 'client_id'
'''
return self._delete_resource("{0}/{1}".format(self.clients_path, client_id))
def get_dcae_locations(self, dcae_layer):
'''
Get the list of location names known to the DMaaP bus controller
whose "dcaeLayer" property matches dcae_layer and whose status is "VALID".
'''
# Do these as a separate step so things like 404 get reported precisely
locations = self._get_resource(LOCATIONS_PATH)
locations.raise_for_status()
# pull out location names for VALID locations with matching dcae_layer
return [location["dcaeLocationName"] for location in locations.json()
if location['dcaeLayer'] == dcae_layer
and location['status'] == 'VALID']
def get_dcae_central_locations(self):
'''
Get the list of location names known to the DMaaP bus controller
whose "dcaeLayer" property contains "central" (ignoring case)
and whose status is "VALID".
"dcaeLayer" contains "central" for central sites.
'''
# Do these as a separate step so things like 404 get reported precisely
locations = self._get_resource(LOCATIONS_PATH)
locations.raise_for_status()
# pull out location names for VALID central locations
return [location["dcaeLocationName"] for location in locations.json()
if 'central' in location['dcaeLayer'].lower()
and location['status'] == 'VALID']
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