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adding stop functionality for graceful shutdown #59

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adding stop functionality for graceful shutdown #59

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ec55528
add stop logic
odedva Jun 3, 2023
f5413ca
add stop logic
odedva Jun 3, 2023
78232a8
add stop logic
odedva Jun 4, 2023
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12 changes: 11 additions & 1 deletion sqs_listener/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,7 @@ def __init__(self, queue, **kwargs):
self._wait_time = kwargs.get('wait_time', 0)
self._max_number_of_messages = kwargs.get('max_number_of_messages', 1)
self._deserializer = kwargs.get("deserializer", json.loads)
self._should_listen = False

# must come last
if boto3_session:
Expand Down Expand Up @@ -139,7 +140,7 @@ def _initialize_client(self):

def _start_listening(self):
# TODO consider incorporating output processing from here: https://github.com/debrouwere/sqs-antenna/blob/master/antenna/__init__.py
while True:
while self._should_listen:
# calling with WaitTimeSecconds of zero show the same behavior as
# not specifiying a wait time, ie: short polling
messages = self._client.receive_message(
Expand All @@ -154,6 +155,8 @@ def _start_listening(self):
sqs_logger.debug(messages)
sqs_logger.info("{} messages received".format(len(messages['Messages'])))
for m in messages['Messages']:
if not self._should_listen:
break
receipt_handle = m['ReceiptHandle']
m_body = m['Body']
message_attribs = None
Expand Down Expand Up @@ -197,15 +200,22 @@ def _start_listening(self):
)

else:
if not self._should_listen:
break
time.sleep(self._poll_interval)
sqs_logger.info("client is not in listening state, stopping sqs listener")

def listen(self):
self._should_listen = True
sqs_logger.info("Listening to queue " + self._queue_name)
if self._error_queue_name:
sqs_logger.info("Using error queue " + self._error_queue_name)

self._start_listening()

def stop(self):
self._should_listen = False

def _prepare_logger(self):
logger = logging.getLogger('eg_daemon')
logger.setLevel(logging.INFO)
Expand Down