Migrating Twisted code to Tornado code " threads.deferToThread"

[Hector Fernandez]

Hi everybody,

I am trying to migrate Twisted code of my app to Tornado equivalents. In particular, I am experiencing some problems when trying to find equivalents to the following Twisted code:

threads.deferToThread(try_func_call, func_call, *args, **kwargs)


def return_value(value):
    defer.returnValue(value)

def function(func_call, *args, **kwards):
    try:
        result = yield threads.deferToThread(try_func_call, func_call, *args, **kwargs)
    except:
        print traceback.format_exc()
    if isinstance(result, Exception):
        raise result

    return_value(result)

Could you give a solution ? I don't want to keep Twisted code in my Tornado app.

Thanks in advance.

Best,
Hector

[A. Jesse Jiryu Davis]

You'll want a ThreadPoolExecutor from the "concurrent.futures" package, which is included in Python 3's standard library. In Python 2, install the "futures" package.

# Do this at global scope.

executor = ThreadPoolExecutor(4)  # number of threads

@gen.coroutine

def caller():

    # Yields to IOLoop. Resumes after callee completes on worker thread.

    yield executor.submit(callee)

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