coroflow

Coroflow: Easy and Fast Pipelines

Coroflow makes it easy to run pipelines with coroutines and also support mixing in blocking functions and generators.

Coroflow does a lot of heavy-lifting for you:

• Manage all tasks in the pipelinen concurently in one thread using coroutines
• Pass data between tasks with queues
• Easily specify concurrency limits
• Connect stages of the pipeline with fan-out/fan-in patterns or load-balancer patterns
• Define tasks as coroutines, normal (blocking) functions, async generators or normal generators; coroflow will run it appropriately in either the event-loop, a thread pool, or optionally in a processes pool
• Provides an apache-ariflow-like api for connecting tasks

Getting Started

Coroflow makes it easy to run pipelines with coroutines and also support mixing in blocking functions and generators

    from coroflow import Node, Pipeline
    import asyncio
    import time


    class GenNode(Node):
        async def execute():
            """
            The execute method of the first/root Node has to be a generator,
            either async or synchronous.
            """
            for url in ['img_url_1', 'img_url_2', 'img_url_3']:
                print(f"Yielding {url}")
                await asyncio.sleep(1)
                yield url
            print("Generator is exhausted")
            return


    class DoSomething(Node):
        async def execute(inpt, param=None):
            """
            The execute method of all non-root Nodes should be a async
            or synchronous method.
            """
            # do your async pipelined work
            await asyncio.sleep(1)  # simulated IO delay
            outp = inpt
            print(f"func1: T1 sending {inpt}")
            return outp


    p = Pipeline()
    t0 = GenNode('gen', p)
    t1 = DoSomething('func1', p, kwargs={'param': 'param_t1'})
    t2 = DoSomething('func2', p, kwargs={'param': 'param_t2'})
    t0.set_downstream(t1)
    t1.set_downstream(t2)


    start_time = time.time()
    p.run()
    print(f"Asynchronous duration: {time.time() - start_time}s.")

Tests

Run like so:

$ pytest