def post(self):
"""
Add subscription
"""
data = request.get_json()
app_name = request.headers["x-leek-app-name"]
subscription = SubscriptionSchema.validate(data)
subscription.update({
"org_name": g.org_name,
"app_name": app_name,
"app_key": settings.LEEK_AGENT_API_SECRET,
"api_url": settings.LEEK_API_URL
})
name = subscription.pop("name")
# Check if there is already a subscription with the same name
with open(SUBSCRIPTIONS_FILE) as s:
subscriptions = json.load(s)
s = subscriptions.get(name)
if s:
return responses.subscription_already_exist
# Ensure connection
try:
connection = Connection(subscription["broker"])
connection.ensure_connection(max_retries=2)
connection.release()
except AccessRefused:
return responses.wrong_access_refused
except Exception:
return responses.broker_not_reachable
# Add subscription
subscriptions[name] = subscription
with open(SUBSCRIPTIONS_FILE, 'w') as f:
json.dump(subscriptions, f, indent=4, sort_keys=False)
return {"name": name, **subscription}, 200
def post(self):
"""
Add subscription
"""
data = request.get_json()
subscription = SubscriptionSchema.validate(data)
if subscription["batch_max_number_of_messages"] > subscription[
"prefetch_count"]:
raise SchemaError(
"Batch max number of messages should be <= prefetch count!")
subscription.update({
"org_name": g.org_name,
"app_name": g.app_name,
"app_key": settings.LEEK_AGENT_API_SECRET,
"api_url": settings.LEEK_API_URL
})
# Check subscription already exist
exist, _ = utils.lookup_subscription(subscription["app_name"],
subscription["app_env"])
if exist:
return responses.subscription_already_exist
# Ensure connection
try:
connection = Connection(subscription["broker"])
connection.ensure_connection(max_retries=2)
connection.release()
except AccessRefused:
return responses.wrong_access_refused
except Exception:
return responses.broker_not_reachable
# Add subscription
with open(SUBSCRIPTIONS_FILE, "r+") as subscriptions_file:
subscriptions = json.load(subscriptions_file)
subscriptions.append(subscription)
subscriptions_file.seek(0)
json.dump(subscriptions, subscriptions_file)
return {
"name": utils.infer_subscription_name(subscription),
**subscription
}, 200
class RPCListener(threading.Thread):
"""
RPC Listener
"""
def __init__(self, host, port, user_id, password, virt_host, exchange_name,
routing_key, consumer_queue_name):
super(RPCListener, self).__init__()
self._exit = threading.Event()
self._exchange_name = exchange_name
self._routing_key = routing_key
self._consumer_queue_name = consumer_queue_name
self._exchange = Exchange(self._exchange_name,
type='topic',
durable=False)
self._connection = Connection(host, user_id, password, virt_host, port)
self._rpc_receive_queue = Queue(self._consumer_queue_name,
durable=True,
exchange=self._exchange,
routing_key=self._routing_key)
self._consumer = Consumer(self._connection, self._rpc_receive_queue)
self._consumer.register_callback(self._callback)
self._message_queue = selectable.ThreadQueue(consumer_queue_name)
self._message_filters_lock = threading.RLock()
self._message_filters = dict()
self._message_handlers = dict()
selobj.selobj_add_read_obj(self._message_queue.selobj,
self._dispatch_messages)
@coroutine
def _dispatch_messages(self):
"""
Dispatch messages from the message queue
"""
while True:
select_obj = (yield)
if select_obj == self._message_queue.selobj:
msg = self._message_queue.get_nowait()
if msg is not None:
msg_type = msg.get('type', None)
if msg_type is not None:
msg_handler = self._message_handlers.get(
msg_type, None)
if msg_handler is not None:
msg_handler(msg['data'])
def add_message_handler(self, msg_type, msg_filter, msg_handler):
"""
Add message handler
"""
self._message_filters_lock.acquire()
try:
self._message_filters[msg_type] = msg_filter
finally:
self._message_filters_lock.release()
self._message_handlers[msg_type] = msg_handler
def del_message_handler(self, msg_type):
"""
Delete message handler
"""
self._message_filters_lock.acquire()
try:
if msg_type in self._message_filters:
del self._message_filters[msg_type]
finally:
self._message_filters_lock.release()
if msg_type in self._message_handlers:
del self._message_handlers[msg_type]
def _callback(self, body, message):
"""
RPC Listener callback
"""
self._message_filters_lock.acquire()
try:
for msg_type, msg_filter in self._message_filters.iteritems():
msg_data = msg_filter(body)
if msg_data is not None:
msg = dict()
msg['type'] = msg_type
msg['data'] = msg_data
self._message_queue.put(msg)
else:
import pprint
pp_msg = pprint.pformat(body)
DLOG.verbose("Ignoring message: %s" % pp_msg)
finally:
self._message_filters_lock.release()
message.ack()
def run(self):
"""
RPC Listener main
"""
def _connection_error(exc, interval):
DLOG.info("Connection error, exception=%s" % exc)
while not self._exit.is_set():
try:
if not self._connection.connected:
DLOG.info(
"RPC-Listener not connected to exchange %s, queue=%s."
% (self._exchange_name, self._consumer_queue_name))
self._connection.ensure_connection(
errback=_connection_error,
interval_start=2,
interval_step=0,
interval_max=2)
self._consumer.revive(self._connection)
DLOG.info(
"RPC-Listener connected to exchange %s, queue=%s." %
(self._exchange_name, self._consumer_queue_name))
self._consumer.consume()
self._connection.drain_events(timeout=1)
except exceptions.TimeoutError as e:
DLOG.verbose("Timeout exception, exception=%s" % e)
except Exception as e:
DLOG.error("Exception received, exception=%s." % e)
time.sleep(2)
def stop(self):
"""
Stop RPC Listener
"""
self._exit.set()
