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awsPySqsListener-0.1.2
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مشاهده بیشترتوضیحات
A simple Python SQS utility package
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | awsPySqsListener-0.1.2 |
| نام | awsPySqsListener |
| نسخه کتابخانه | 0.1.2 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Umabalan Nagarajan |
| ایمیل نویسنده | umabalan2010@gmail.com |
| آدرس صفحه اصلی | https://github.com/balan2010/python-sqs-listener |
| آدرس اینترنتی | https://pypi.org/project/awsPySqsListener/ |
| مجوز | Apache Software License |
AWS SQS Listener
----------------
This package takes care of the boilerplate involved in listening to an SQS
queue, as well as sending messages to a queue. Thanks to @eligro91, the package now supports python 3.6!
Installation
~~~~~~~~~~~~
``pip install awsPySqsListener``
Listening to a queue
~~~~~~~~~~~~~~~~~~~~
| Using the listener is very straightforward - just inherit from the
``SqsListener`` class and implement the ``handle_message()`` method.
The queue will be created at runtime if it doesn't already exist.
You can also specify an error queue to automatically push any errors to.
Here is a basic code sample:
**Standard Listener**
::
from sqs_listener import SqsListener
class MyListener(SqsListener):
def handle_message(self, body, attributes, messages_attributes):
run_my_function(body['param1'], body['param2'])
listener = MyListener('my-message-queue', error_queue='my-error-queue', region_name='us-east-1')
listener.listen()
**Error Listener**
::
from sqs_listener import SqsListener
class MyErrorListener(SqsListener):
def handle_message(self, body, attributes, messages_attributes):
save_to_log(body['exception_type'], body['error_message']
error_listener = MyErrorListener('my-error-queue')
error_listener.listen()
| The options available as ``kwargs`` are as follows:
- error_queue (str) - name of queue to push errors.
- force_delete (boolean) - delete the message received from the queue, whether or not the handler function is successful. By default the message is deleted only if the handler function returns with no exceptions
- interval (int) - number of seconds in between polls. Set to 60 by default
- visibility_timeout (str) - Number of seconds the message will be invisible ('in flight') after being read. After this time interval it reappear in the queue if it wasn't deleted in the meantime. Set to '600' (10 minutes) by default
- error_visibility_timeout (str) - Same as previous argument, for the error queue. Applicable only if the ``error_queue`` argument is set, and the queue doesn't already exist.
Running as a Daemon
~~~~~~~~~~~~~~~~~~~
| Typically, in a production environment, you'll want to listen to an SQS queue with a daemonized process.
This can be achieved easily by inheriting from the package's ``Daemon`` class and overriding the ``run()`` method.
|
| The sample_daemon.py file in the source root folder provides a clear example for achieving this. Using this example,
you can run the listener as a daemon with the command ``python sample_daemon.py start``. Similarly, the command
``python sample_daemon.py stop`` will stop the process. You'll most likely need to run the start script using ``sudo``.
|
Logging
~~~~~~~
| The listener and launcher instances push all their messages to a ``logger`` instance, called 'sqs_listener'.
In order to view the messages, the logger needs to be redirected to ``stdout`` or to a log file.
|
| For instance:
::
logger = logging.getLogger('sqs_listener')
logger.setLevel(logging.INFO)
sh = logging.StreamHandler(sys.stdout)
sh.setLevel(logging.INFO)
formatstr = '[%(asctime)s - %(name)s - %(levelname)s] %(message)s'
formatter = logging.Formatter(formatstr)
sh.setFormatter(formatter)
logger.addHandler(sh)
|
| Or to a log file:
::
logger = logging.getLogger('sqs_listener')
logger.setLevel(logging.INFO)
sh = logging.FileHandler('mylog.log')
sh.setLevel(logging.INFO)
formatstr = '[%(asctime)s - %(name)s - %(levelname)s] %(message)s'
formatter = logging.Formatter(formatstr)
sh.setFormatter(formatter)
logger.addHandler(sh)
Sending messages
~~~~~~~~~~~~~~~~
| In order to send a message, instantiate an ``SqsLauncher`` with the name of the queue. By default an exception will
be raised if the queue doesn't exist, but it can be created automatically if the ``create_queue`` parameter is
set to true. In such a case, there's also an option to set the newly created queue's ``VisibilityTimeout`` via the
third parameter.
|
| After instantiation, use the ``launch_message()`` method to send the message. The message body should be a ``dict``,
and additional kwargs can be specified as stated in the `SQS docs
<http://boto3.readthedocs.io/en/latest/reference/services/sqs.html#SQS.Client.send_message>`_.
The method returns the response from SQS.
**Launcher Example**
::
from sqs_launcher import SqsLauncher
launcher = SqsLauncher('my-queue')
response = launcher.launch_message({'param1': 'hello', 'param2': 'world'})
Important Notes
~~~~~~~~~~~~~~~
- The environment variable ``AWS_ACCOUNT_ID`` must be set, in addition
to the environment having valid AWS credentials (via environment variables or a credentials file)
- For both the main queue and the error queue, if the queue doesn’t
exist (in the specified region), it will be created at runtime.
- The error queue receives only two values in the message body: ``exception_type`` and ``error_message``. Both are of type ``str``
- If the function that the listener executes involves connecting to a database, you should explicitly close the connection at the end of the function. Otherwise, you're likely to get an error like this: ``OperationalError(2006, 'MySQL server has gone away')``
Contributing
~~~~~~~~~~~~
Fork the repo and make a pull request.
نحوه نصب
نصب پکیج whl awsPySqsListener-0.1.2:
pip install awsPySqsListener-0.1.2.whl
نصب پکیج tar.gz awsPySqsListener-0.1.2:
pip install awsPySqsListener-0.1.2.tar.gz