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Python retry utility

Project description

Travis Test Status

A simple way to auto retry a funciton that has the possibility of raising an error. You can either call retry directly or decorate a function to get it to retry. Intelligent matching logic allows you to retry certain exception while raising other exceptions.

Using retry as a function:

from retrypy import retry, check
def dummy_func():
    print "dummy_func called..."
    raise Exception("House")

retry.call(
    dummy_func,
    times=2
)

dummy_func called...
dummy_func called...
Exception: House

# usign a check method
retry.call(
    dummy_func,
    check = check.message_equals("foobar")
)
dummy_func called...
Exception: House

Params:

func: The function you want to call.
args: Positional args to be passed to func
kwargs: keywords args to be passed to func
exceptions: an array of Exception types you want to retry on.
check: A function that excepts Exception and Count and
    returns true if the function should be retried.
times: number of times to try the function (default=5)
wait: number of seconds to wait between tries (default=0) or a function
    that accepts try_count and returns a number of seconds to wait

Or you can use it as a decorator:

@retry.decorate(Exception, times=2)
def dummy_func():
    print "dummy_func called..."
    raise Exception("House")
dummy_func()

dummy_func called...
dummy_func called...
Exception: House

# custom wait function
@retry.decorate(Exception, times=2, wait=lambda n: 2*n)
def dummy_func():
    print "dummy_func called..."
    raise Exception("House")
dummy_func()

dummy_func called...
dummy_func called...
Exception: House

Params:

positional_args: All position arguments must be Exception types, these
    are the only types of exceptions we will retry.
check: see retrypy.call
times: see retrypy.call
wait: see retrypy.call

Or you can use it to wrap a function and return a new callable

def dummy_func():
    print "dummy_func called..."
    raise Exception("House")

func = retry.wrap(
    dummy_func,
    times=2
)
func()

dummy_func called...
dummy_func called...
Exception: House

Params: See Docs for retry.call

Installation

>> pip install retrypy

License:

See LICENSE

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