import riprova

@riprova.retry
def task():
    """Retry operation if it fails with constant backoff (default)"""

@riprova.retry(backoff=riprova.ConstantBackoff(retries=5))
def task():
    """Retry operation if it fails with custom max number of retry attempts"""

@riprova.retry(backoff=riprova.ExponentialBackOff(factor=0.5))
def task():
    """Retry operation if it fails using exponential backoff"""

@riprova.retry(timeout=10)
def task():
    """Raises a TimeoutError if the retry loop exceeds from 10 seconds"""

def on_retry(err, next_try):
    print('Operation error: {}'.format(err))
    print('Next try in: {}ms'.format(next_try))

@riprova.retry(on_retry=on_retry)
def task():
    """Subscribe via function callback to every retry attempt"""

def evaluator(response):
    # Force retry operation if not a valid response
    if response.status >= 400:
        raise RuntimeError('invalid response status')  # or simple return True
    # Otherwise return False, meaning no retry
    return False

@riprova.retry(evaluator=evaluator)
def task():
    """Use a custom evaluator function to determine if the operation failed or not"""

@riprova.retry
async def task():
    """Asynchronous coroutines are also supported :)"""

import pook
import requests
from riprova import retry

# Define HTTP mocks to simulate failed requests
pook.get('server.com').times(3).reply(503)
pook.get('server.com').times(1).reply(200).json({'hello': 'world'})


# Retry evaluator function used to determine if the operated failed or not
def evaluator(response):
    if response != 200:
        return Exception('failed request')  # you can also simply return True
    return False


# On retry even subscriptor
def on_retry(err, next_try):
    print('Operation error {}'.format(err))
    print('Next try in {}ms'.format(next_try))


# Register retriable operation
@retry(evaluator=evaluator, on_retry=on_retry)
def fetch(url):
    return requests.get(url)


# Run task that might fail
fetch('http://server.com')