pymachinery 0.1.3

Python workers for RichardKnop/machinery

Machinery Python SDK

PyPI

This is a subset Python implementation of a worker for RichardKnop/machinery.

Limitations

• Broker is strictly only for Redis
• BackendResult is strictly only for MongoDB

Development Environment

Use venv with python 3.

# ---- Setup
$ sudo apt install python3 python3-venv
$ python3 -m venv ~/.venv/simcel
# ---- Activate venv
$ source ~/.venv/simcel/bin/activate
(simcel) $ pip3 install -r requirements.txt
# ---- Running
(simcel) $ python3 main.py

Usage

To start up machinery instance for Python:

from machinery import Value, Machinery

def add(a: Value, b: Value):
    return (Value("int64", a.value() + b.value()))

def multiply(a: Value, b: Value):
    return (Value("int64", a.value() * b.value()))

def worker(name: Value, delayms: Value):
    return (
        Value("string", f"hello {name.value()}"),
        Value("int64", delayms),
    )

machinery = Machinery(
    broker_uri="redis://:helloworld@localhost:6379",
    backend_uri="mongodb://mongo:moonbucks@localhost:27017/?authSource=admin",
    queue="machinery_tasks",
)
machinery.register_callback("add", add)
machinery.register_callback("multiply", multiply)
machinery.register_callback("hello", worker)
# Note that start() is a blocking function.
machinery.start()

To send a machinery task and receive its results:

task = machinery.send_task(queue, "add", [
    Value("int64", 30),
    Value("int64", 50)
])
# Note that wait_for_results() is a blocking function.
results = machinery.wait_for_results(task)
print(results)      # [ Value("int64", 80) ]

Creating a Worker

Workers have these restrictions:

• Inputs should be of type pymachinery.Value
• Outputs should be of type pymachinery.Value, or a tuple of pymachinery.Value