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retrying.py

## Copyright 2013-2014 Ray Holder
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
## http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.

import random
from pip._vendor import six
import sys
import time
import traceback

# sys.maxint / 2, since Python 3.2 doesn't have a sys.maxint...
MAX_WAIT = 1073741823

def retry(*dargs, **dkw):
    """
    Decorator function that instantiates the Retrying object
    @param *dargs: positional arguments passed to Retrying object
    @param **dkw: keyword arguments passed to the Retrying object
    """
    # support both @retry and @retry() as valid syntax
    if len(dargs) == 1 and callable(dargs[0]):
        def wrap_simple(f):

@six.wraps(f)
            def wrapped_f(*args, **kw):
                return Retrying().call(f, *args, **kw)

return wrapped_f

return wrap_simple(dargs[0])

else:
        def wrap(f):

@six.wraps(f)
            def wrapped_f(*args, **kw):
                return Retrying(*dargs, **dkw).call(f, *args, **kw)

return wrapped_f

return wrap

class Retrying(object):

def __init__(self,
                 stop=None, wait=None,
                 stop_max_attempt_number=None,
                 stop_max_delay=None,
                 wait_fixed=None,
                 wait_random_min=None, wait_random_max=None,
                 wait_incrementing_start=None, wait_incrementing_increment=None,
                 wait_exponential_multiplier=None, wait_exponential_max=None,
                 retry_on_exception=None,
                 retry_on_result=None,
                 wrap_exception=False,
                 stop_func=None,
                 wait_func=None,
                 wait_jitter_max=None):

self._stop_max_attempt_number = 5 if stop_max_attempt_number is None else stop_max_attempt_number
        self._stop_max_delay = 100 if stop_max_delay is None else stop_max_delay
        self._wait_fixed = 1000 if wait_fixed is None else wait_fixed
        self._wait_random_min = 0 if wait_random_min is None else wait_random_min
        self._wait_random_max = 1000 if wait_random_max is None else wait_random_max
        self._wait_incrementing_start = 0 if wait_incrementing_start is None else wait_incrementing_start
        self._wait_incrementing_increment = 100 if wait_incrementing_increment is None else wait_incrementing_increment
        self._wait_exponential_multiplier = 1 if wait_exponential_multiplier is None else wait_exponential_multiplier
        self._wait_exponential_max = MAX_WAIT if wait_exponential_max is None else wait_exponential_max
        self._wait_jitter_max = 0 if wait_jitter_max is None else wait_jitter_max

# TODO add chaining of stop behaviors
        # stop behavior
        stop_funcs = []
        if stop_max_attempt_number is not None:
            stop_funcs.append(self.stop_after_attempt)

if stop_max_delay is not None:
            stop_funcs.append(self.stop_after_delay)

if stop_func is not None:
            self.stop = stop_func

elif stop is None:
            self.stop = lambda attempts, delay: any(f(attempts, delay) for f in stop_funcs)

else:
            self.stop = getattr(self, stop)

# TODO add chaining of wait behaviors
        # wait behavior
        wait_funcs = [lambda *args, **kwargs: 0]
        if wait_fixed is not None:
            wait_funcs.append(self.fixed_sleep)

if wait_random_min is not None or wait_random_max is not None:
            wait_funcs.append(self.random_sleep)

if wait_incrementing_start is not None or wait_incrementing_increment is not None:
            wait_funcs.append(self.incrementing_sleep)

if wait_exponential_multiplier is not None or wait_exponential_max is not None:
            wait_funcs.append(self.exponential_sleep)

if wait_func is not None:
            self.wait = wait_func

elif wait is None:
            self.wait = lambda attempts, delay: max(f(attempts, delay) for f in wait_funcs)

else:
            self.wait = getattr(self, wait)

# retry on exception filter
        if retry_on_exception is None:
            self._retry_on_exception = self.always_reject
        else:
            self._retry_on_exception = retry_on_exception

# TODO simplify retrying by Exception types
        # retry on result filter
        if retry_on_result is None:
            self._retry_on_result = self.never_reject
        else:
            self._retry_on_result = retry_on_result

self._wrap_exception = wrap_exception

def stop_after_attempt(self, previous_attempt_number, delay_since_first_attempt_ms):
        """Stop after the previous attempt >= stop_max_attempt_number."""
        return previous_attempt_number >= self._stop_max_attempt_number

def stop_after_delay(self, previous_attempt_number, delay_since_first_attempt_ms):
        """Stop after the time from the first attempt >= stop_max_delay."""
        return delay_since_first_attempt_ms >= self._stop_max_delay

def no_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
        """Don't sleep at all before retrying."""
        return 0

def fixed_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
        """Sleep a fixed amount of time between each retry."""
        return self._wait_fixed

def random_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
        """Sleep a random amount of time between wait_random_min and wait_random_max"""
        return random.randint(self._wait_random_min, self._wait_random_max)

def incrementing_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
        """
        Sleep an incremental amount of time after each attempt, starting at
        wait_incrementing_start and incrementing by wait_incrementing_increment
        """
        result = self._wait_incrementing_start + (self._wait_incrementing_increment * (previous_attempt_number - 1))
        if result < 0:
            result = 0
        return result

def exponential_sleep(self, previous_attempt_number, delay_since_first_attempt_ms):
        exp = 2 ** previous_attempt_number
        result = self._wait_exponential_multiplier * exp
        if result > self._wait_exponential_max:
            result = self._wait_exponential_max
        if result < 0:
            result = 0
        return result

def never_reject(self, result):
        return False

def always_reject(self, result):
        return True

def should_reject(self, attempt):
        reject = False
        if attempt.has_exception:
            reject |= self._retry_on_exception(attempt.value[1])
        else:
            reject |= self._retry_on_result(attempt.value)

return reject

def call(self, fn, *args, **kwargs):
        start_time = int(round(time.time() * 1000))
        attempt_number = 1
        while True:
            try:
                attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
            except:
                tb = sys.exc_info()
                attempt = Attempt(tb, attempt_number, True)

if not self.should_reject(attempt):
                return attempt.get(self._wrap_exception)

delay_since_first_attempt_ms = int(round(time.time() * 1000)) - start_time
            if self.stop(attempt_number, delay_since_first_attempt_ms):
                if not self._wrap_exception and attempt.has_exception:
                    # get() on an attempt with an exception should cause it to be raised, but raise just in case
                    raise attempt.get()
                else:
                    raise RetryError(attempt)
            else:
                sleep = self.wait(attempt_number, delay_since_first_attempt_ms)
                if self._wait_jitter_max:
                    jitter = random.random() * self._wait_jitter_max
                    sleep = sleep + max(0, jitter)
                time.sleep(sleep / 1000.0)

attempt_number += 1

class Attempt(object):
    """
    An Attempt encapsulates a call to a target function that may end as a
    normal return value from the function or an Exception depending on what
    occurred during the execution.
    """

def __init__(self, value, attempt_number, has_exception):
        self.value = value
        self.attempt_number = attempt_number
        self.has_exception = has_exception

def get(self, wrap_exception=False):
        """
        Return the return value of this Attempt instance or raise an Exception.
        If wrap_exception is true, this Attempt is wrapped inside of a
        RetryError before being raised.
        """
        if self.has_exception:
            if wrap_exception:
                raise RetryError(self)
            else:
                six.reraise(self.value[0], self.value[1], self.value[2])
        else:
            return self.value

def __repr__(self):
        if self.has_exception:
            return "Attempts: {0}, Error:\n{1}".format(self.attempt_number, "".join(traceback.format_tb(self.value[2])))
        else:
            return "Attempts: {0}, Value: {1}".format(self.attempt_number, self.value)

class RetryError(Exception):
    """
    A RetryError encapsulates the last Attempt instance right before giving up.
    """

def __init__(self, last_attempt):
        self.last_attempt = last_attempt

def __str__(self):
        return "RetryError[{0}]".format(self.last_attempt)

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__init__.py	text/plain	4.56 KB	root/root	0644	2024-04-06 01:40:45
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retrying.py	text/x-python	9.74 KB	root/root	0644	2024-04-06 01:40:45
six.py	text/plain	29.39 KB	root/root	0644	2024-04-06 01:40:45