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Diffstat (limited to 'osdf/optimizers/placementopt/conductor/conductor.py')
| -rw-r--r-- | osdf/optimizers/placementopt/conductor/conductor.py | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/osdf/optimizers/placementopt/conductor/conductor.py b/osdf/optimizers/placementopt/conductor/conductor.py new file mode 100644 index 0000000..bdc7f17 --- /dev/null +++ b/osdf/optimizers/placementopt/conductor/conductor.py @@ -0,0 +1,186 @@ +# ------------------------------------------------------------------------- +# Copyright (c) 2015-2017 AT&T Intellectual Property +# +# 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. +# +# ------------------------------------------------------------------------- +# + +""" +This application generates conductor API calls using the information received from SO and Policy platform. +""" + +import json +import time + +from jinja2 import Template +from requests import RequestException + +from osdf.logging.osdf_logging import debug_log +from osdf.optimizers.placementopt.conductor.api_builder import conductor_api_builder +from osdf.utils.interfaces import RestClient +from osdf.operation.exceptions import BusinessException + + +def request(req_object, osdf_config, grouped_policies, prov_status): + """ + Process a placement request from a Client (build Conductor API call, make the call, return result) + :param req_object: Request parameters from the client + :param osdf_config: Configuration specific to SNIRO application (core + deployment) + :param grouped_policies: policies related to placement (fetched based on request, and grouped by policy type) + :param prov_status: provStatus retrieved from Subscriber policy + :return: response from Conductor (accounting for redirects from Conductor service + """ + config = osdf_config.deployment + local_config = osdf_config.core + uid, passwd = config['conductorUsername'], config['conductorPassword'] + conductor_url = config['conductorUrl'] + req_id = req_object['requestInfo']['requestId'] + transaction_id = req_object['requestInfo']['transactionId'] + headers = dict(transaction_id=transaction_id) + + max_retries = config.get('conductorMaxRetries', 30) + ping_wait_time = config.get('conductorPingWaitTime', 60) + + rc = RestClient(userid=uid, passwd=passwd, method="GET", log_func=debug_log.debug, headers=headers) + conductor_req_json_str = conductor_api_builder(req_object, grouped_policies, local_config, prov_status) + conductor_req_json = json.loads(conductor_req_json_str) + + debug_log.debug("Sending first Conductor request for request_id {}".format(req_id)) + resp, raw_resp = initial_request_to_conductor(rc, conductor_url, conductor_req_json) + # Very crude way of keeping track of time. + # We are not counting initial request time, first call back, or time for HTTP request + total_time, ctr = 0, 2 + client_timeout = req_object['requestInfo']['timeout'] + configured_timeout = max_retries * ping_wait_time + max_timeout = min(client_timeout, configured_timeout) + + while True: # keep requesting conductor till we get a result or we run out of time + if resp is not None: + if resp["plans"][0].get("status") in ["error"]: + raise RequestException(response=raw_resp, request=raw_resp.request) + + if resp["plans"][0].get("status") in ["done", "not found"]: + if resp["plans"][0].get("recommendations"): + return conductor_response_processor(resp, raw_resp, req_id) + else: # "solved" but no solutions found + return conductor_no_solution_processor(resp, raw_resp, req_id) + new_url = resp['plans'][0]['links'][0][0]['href'] # TODO: check why a list of lists + + if total_time >= max_timeout: + raise BusinessException("Conductor could not provide a solution within {} seconds, this transaction is timing out".format(max_timeout)) + time.sleep(ping_wait_time) + ctr += 1 + debug_log.debug("Attempt number {} url {}; prior status={}".format(ctr, new_url, resp['plans'][0]['status'])) + total_time += ping_wait_time + + try: + raw_resp = rc.request(new_url, raw_response=True) + resp = raw_resp.json() + except RequestException as e: + debug_log.debug("Conductor attempt {} for request_id {} has failed because {}".format(ctr, req_id, str(e))) + + +def initial_request_to_conductor(rc, conductor_url, conductor_req_json): + """First steps in the request-redirect chain in making a call to Conductor + :param rc: REST client object for calling conductor + :param conductor_url: conductor's base URL to submit a placement request + :param conductor_req_json: request json object to send to Conductor + :return: URL to check for follow up (similar to redirects); we keep checking these till we get a result/error + """ + debug_log.debug("Payload to Conductor: {}".format(json.dumps(conductor_req_json))) + raw_resp = rc.request(url=conductor_url, raw_response=True, method="POST", json=conductor_req_json) + resp = raw_resp.json() + if resp["status"] != "template": + raise RequestException(response=raw_resp, request=raw_resp.request) + time.sleep(10) # 10 seconds wait time to avoid being too quick! + plan_url = resp["links"][0][0]["href"] + debug_log.debug("Attemping to read the plan from the conductor provided url {}".format(plan_url)) + raw_resp = rc.request(raw_response=True, url=plan_url) # TODO: check why a list of lists for links + resp = raw_resp.json() + + if resp["plans"][0]["status"] in ["error"]: + raise RequestException(response=raw_resp, request=raw_resp.request) + return resp, raw_resp # now the caller of this will handle further follow-ups + + +def conductor_response_processor(conductor_response, raw_response, req_id): + """Build a response object to be sent to client's callback URL from Conductor's response + This includes Conductor's placement optimization response, and required ASDC license artifacts + + :param conductor_response: JSON response from Conductor + :param raw_response: Raw HTTP response corresponding to above + :param req_id: Id of a request + :return: JSON object that can be sent to the client's callback URL + """ + composite_solutions = [] + name_map = {"physical-location-id": "cloudClli", "host_id": "vnfHostName", + "cloud_version": "cloudVersion", "cloud_owner": "cloudOwner"} + for reco in conductor_response['plans'][0]['recommendations']: + for resource in reco.keys(): + c = reco[resource]['candidate'] + solution = { + 'resourceModuleName': resource, + 'serviceResourceId': reco[resource]['service_resource_id'], + 'inventoryType': c['inventory_type'], + 'serviceInstanceId': c['candidate_id'] if c['inventory_type'] == "service" else "", + 'cloudRegionId': c['location_id'], + 'assignmentInfo': [] + } + + for key, value in reco[resource]['attributes'].items(): + try: + solution['assignmentInfo'].append({"variableName": name_map[key], "variableValue": value}) + except KeyError: + debug_log.debug("The key[{}] is not mapped and will not be returned in assignment info".format(key)) + + if c.get('host_id'): + solution['assignmentInfo'].append({'variableName': name_map['host_id'], 'variableValue': c['host_id']}) + composite_solutions.append(solution) + + request_state = conductor_response['plans'][0]['status'] + transaction_id = raw_response.headers.get('transaction_id', "") + status_message = conductor_response.get('plans')[0].get('message', "") + + solution_info = {} + if composite_solutions: + solution_info['placementInfo'] = composite_solutions + + resp = { + "transactionId": transaction_id, + "requestId": req_id, + "requestState": request_state, + "statusMessage": status_message, + "solutionInfo": solution_info + } + return resp + + +def conductor_no_solution_processor(conductor_response, raw_response, request_id, + template_placement_response="templates/plc_opt_response.jsont"): + """Build a response object to be sent to client's callback URL from Conductor's response + This is for case where no solution is found + + :param conductor_response: JSON response from Conductor + :param raw_response: Raw HTTP response corresponding to above + :param request_id: request Id associated with the client request (same as conductor response's "name") + :param template_placement_response: the template for generating response to client (plc_opt_response.jsont) + :return: JSON object that can be sent to the client's callback URL + """ + status_message = conductor_response["plans"][0].get("message") + templ = Template(open(template_placement_response).read()) + return json.loads(templ.render(composite_solutions=[], requestId=request_id, + transactionId=raw_response.headers.get('transaction_id', ""), + statusMessage=status_message, json=json)) + + |