This is a pre-production deployment of Warehouse, however changes made here WILL affect the production instance of PyPI.
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Project Description

This is forked from FreshPlanet’s improved App Engine Deferred module. and has the added functionality of having a Django View along with the webapp2 handler so that it can be used in either project type.

The AppEngine Python SDK has a great module when it comes to easily run some code “later”: the deferred library (if you are unfamiliar with this library, please have a look at its documentation first).

However the library has a few drawbacks that we solve here:

  • No asynchronous method (issue 9530)
  • The internal request handler inherits from webapp instead of webapp2 which can be an issue when using some webapp2 features (like webapp2.get_request)
  • It uses pickle instead of leveraging cPickle available with the Python 2.7 runtime.
  • The Route it uses is internal and will skip your middlewares unless you define them in a special appengine_config.py module.
  • Task could fail to properly execute when hitting a fresh instance which did not had all code loaded
  • Logging is a bit verbose: it uses the INFO level to show task headers that are redundant with what we can see by default in the AppEngine logs

We also added a couple of features to it:

  • Explicit URLs for tasks: instead of just seeing /_ah/queue/deferred in your logs you will see something like /_cb/deferred/app.module.name/funcName
  • Possibility to spread tasks over several queues in case of high throughput
  • Improved logging in case of error
  • Possibility to tie it to a background module to optimize serving requests

And some helpers: - is_from_task_queue(): Check if we are currently running from a task queue - get_retry_count(): Returns the current number of times the current task is being retried - log_as_retried(): Depending on # of times the task is being retried, we will increase the logging level.

Our module still makes use of the deferred exceptions types `SingularTaskFailure` and `PermanentTaskFailure` to be compatible with existing code.

Installation

  1. pip install fh-django-gae-tasks
  2. Load the app in your Django project’s settings.py
INSTALLED_APPS = (
    'gae_tasks'
)
  1. Load the URL for the app
urlpatterns = [
    url(r'^', include('gae_tasks.urls')),
]
  1. Optionally, better integrate with your application by updating the tasks settings:
GAE_TASKS_DISABLE: False
GAE_TASKS_WARMUP_MODULE: None
GAE_TASKS_DEFAULT_QUEUES: ['default']
GAE_TASKS_BACKGROUND_MODULE: None

(See the tasks module for more details)

Release History

Release History

0.2.4

This version

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0.2.3

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0.2.2

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0.2.1

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0.2.0

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0.1.1

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0.1.0

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
fh-django-gae-tasks-0.2.4.tar.gz (6.8 kB) Copy SHA256 Checksum SHA256 Source Mar 11, 2016

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