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-rwxr-xr-xadapters/dcae/message_router.py100
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diff --git a/adapters/dcae/message_router.py b/adapters/dcae/message_router.py
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+# -------------------------------------------------------------------------
+# 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.
+#
+# -------------------------------------------------------------------------
+#
+
+import requests
+from osdf.utils.data_types import list_like
+from osdf.operation.exceptions import MessageBusConfigurationException
+
+
+class MessageRouterClient(object):
+ def __init__(self,
+ dmaap_url=None,
+ mr_host_base_urls=None,
+ topic=None,
+ consumer_group=None, consumer_id=None,
+ timeout_ms=15000, fetch_limit=1000,
+ userid=None, passwd=None):
+ """
+ :param dmaap_url: protocol, host and port; mostly for UEB
+ (e.g. https://dcae-msrt-ftl.homer.att.com:3905/)
+ :param mr_host_base_urls: for DMaaP, we get a topic URL (base_url + events/topic_name)
+ (e.g. https://dcae-msrt-ftl.homer.att.com:3905/events/com.att.dcae.dmaap.FTL.SNIRO-CM-SCHEDULER-RESPONSE)
+ :param consumer_group: DMaaP/UEB consumer group (unique for each subscriber; required for GET)
+ :param consumer_id: DMaaP/UEB consumer ID (unique for each thread/process for a subscriber; required for GET)
+ :param timeout_ms: (optional, default 15 seconds or 15,000 ms) server-side timeout for GET request
+ :param fetch_limit: (optional, default 1000 messages per request for GET), ignored for "POST"
+ :param userid: (optional, userid for HTTP basic authentication)
+ :param passwd: (optional, password for HTTP basic authentication)
+ """
+ mr_error = MessageBusConfigurationException
+ if dmaap_url is None: # definitely not DMaaP, so use UEB mode
+ self.is_dmaap = False
+ if not (mr_host_base_urls and list_like(mr_host_base_urls)):
+ raise mr_error("Not a DMaaP or UEB configuration")
+ if not topic:
+ raise mr_error("Invalid topic: '{}'",format(topic))
+ self.topic_urls = ["{}/events/{}".format(base_url, topic) for base_url in mr_host_base_urls]
+ else:
+ self.is_dmaap = True
+ self.topic_urls = [dmaap_url]
+
+ self.timeout_ms = timeout_ms
+ self.fetch_limit = fetch_limit
+ self.auth = (userid, passwd) if userid and passwd else None
+ self.consumer_group = consumer_group
+ self.consumer_id = consumer_id
+
+ def get(self, outputjson=True):
+ """Fetch messages from message router (DMaaP or UEB)
+ :param outputjson: (optional, specifies if response is expected to be in json format), ignored for "POST"
+ :return: response as a json object (if outputjson is True) or as a string
+ """
+ url_fmt = "{topic_url}/{cgroup}/{cid}?timeout={timeout_ms}&limit={limit}"
+ urls = [url_fmt.format(topic_url=x, timeout_ms=self.timeout_ms, limit=self.fetch_limit,
+ cgroup=self.consumer_group, cid=self.consumer_id) for x in self.topic_urls]
+ for url in urls[:-1]:
+ try:
+ return self.http_request(method='GET', url=url, outputjson=outputjson)
+ except:
+ pass
+ return self.http_request(method='GET', url=urls[-1], outputjson=outputjson)
+
+ def post(self, msg, inputjson=True):
+ for url in self.topic_urls[:-1]:
+ try:
+ return self.http_request(method='POST', url=url, inputjson=inputjson, msg=msg)
+ except:
+ pass
+ return self.http_request(method='POST', url=self.topic_urls[-1], inputjson=inputjson, msg=msg)
+
+ def http_request(self, url, method, inputjson=True, outputjson=True, msg=None, **kwargs):
+ """
+ Perform the actual URL request (GET or POST), and do error handling
+ :param url: full URL (including topic, limit, timeout, etc.)
+ :param method: GET or POST
+ :param inputjson: Specify whether input is in json format (valid only for POST)
+ :param outputjson: Is response expected in a json format
+ :param msg: content to be posted (valid only for POST)
+ :return: response as a json object (if outputjson or POST) or as a string; None if error
+ """
+ res = requests.request(url=url, method=method, auth=self.auth, **kwargs)
+ if res.status_code == requests.codes.ok:
+ return res.json() if outputjson or method == "POST" else res.content
+ else:
+ raise Exception("HTTP Response Error: code {}; headers:{}, content: {}".format(
+ res.status_code, res.headers, res.content))