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Postgres-based distributed task processing library

Project description

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Procrastinate is an open-source Python 3.6+ distributed task processing library, leveraging PostgreSQL to store task definitions, manage locks and dispatch tasks.

In other words, from your main code, you call specific functions (tasks) in a special way and instead of being run on the spot, they’re scheduled to be run elsewhere, now or in the future.

Here’s an example

# mycode.py

# Make a app in your code
app = procrastinate.App(job_store=procrastinate.PostgresJobStore())

# Then define tasks
@app.task(queue="sums")
def sum(a, b):
    with open("myfile", "w") as f:
        f.write(str(a + b))

# Launch a job
sum.defer(a=3, b=5)

# Somewhere in your program, run a worker
worker = procrastinate.Worker(
    app=app,
    queues=["sums"]
)
worker.run()

The worker will run the job, which will create a text file named myfile with the result of the sum 3 + 5 (that’s 8).

Similarly, from the command line:

export PROCRASTINATE_APP="mycode.app"

# Launch a job
procrastinate defer mycode.sum '{"a": 3, "b": 5}'

# Run a worker
procrastinate worker sums

There are quite a few interesting features that Procrastinate adds to the mix. You can head to the Quickstart section for a general tour or to the How-To sections for specific features. The Discussion section should hopefully answer your questions. Otherwise, feel free to open an issue.

The project is still quite early-stage and will probably evolve.

Note to my future self: add a quick note here on why this project is namedProcrastinate”.

Where to go from here

The complete docs is probably the best place to learn about the project.

If you encounter a bug, or want to get in touch, you’re always welcome to open a ticket.

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