502 lines
20 KiB
Python
502 lines
20 KiB
Python
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"""Utilities for patching in cassettes"""
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import functools
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import itertools
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from .compat import contextlib, mock
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from .stubs import VCRHTTPConnection, VCRHTTPSConnection
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from six.moves import http_client as httplib
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import logging
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log = logging.getLogger(__name__)
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# Save some of the original types for the purposes of unpatching
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_HTTPConnection = httplib.HTTPConnection
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_HTTPSConnection = httplib.HTTPSConnection
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# Try to save the original types for boto3
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try:
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from botocore.awsrequest import AWSHTTPSConnection, AWSHTTPConnection
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except ImportError:
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try:
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import botocore.vendored.requests.packages.urllib3.connectionpool as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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_Boto3VerifiedHTTPSConnection = cpool.VerifiedHTTPSConnection
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_cpoolBoto3HTTPConnection = cpool.HTTPConnection
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_cpoolBoto3HTTPSConnection = cpool.HTTPSConnection
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else:
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_Boto3VerifiedHTTPSConnection = AWSHTTPSConnection
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_cpoolBoto3HTTPConnection = AWSHTTPConnection
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_cpoolBoto3HTTPSConnection = AWSHTTPSConnection
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cpool = None
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# Try to save the original types for urllib3
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try:
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import urllib3.connectionpool as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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_VerifiedHTTPSConnection = cpool.VerifiedHTTPSConnection
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_cpoolHTTPConnection = cpool.HTTPConnection
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_cpoolHTTPSConnection = cpool.HTTPSConnection
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# Try to save the original types for requests
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try:
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if not cpool:
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import requests.packages.urllib3.connectionpool as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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_VerifiedHTTPSConnection = cpool.VerifiedHTTPSConnection
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_cpoolHTTPConnection = cpool.HTTPConnection
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_cpoolHTTPSConnection = cpool.HTTPSConnection
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# Try to save the original types for httplib2
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try:
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import httplib2
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except ImportError: # pragma: no cover
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pass
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else:
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_HTTPConnectionWithTimeout = httplib2.HTTPConnectionWithTimeout
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_HTTPSConnectionWithTimeout = httplib2.HTTPSConnectionWithTimeout
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_SCHEME_TO_CONNECTION = httplib2.SCHEME_TO_CONNECTION
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# Try to save the original types for boto
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try:
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import boto.https_connection
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except ImportError: # pragma: no cover
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pass
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else:
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_CertValidatingHTTPSConnection = boto.https_connection.CertValidatingHTTPSConnection
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# Try to save the original types for Tornado
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try:
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import tornado.simple_httpclient
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except ImportError: # pragma: no cover
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pass
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else:
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_SimpleAsyncHTTPClient_fetch_impl = tornado.simple_httpclient.SimpleAsyncHTTPClient.fetch_impl
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try:
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import tornado.curl_httpclient
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except ImportError: # pragma: no cover
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pass
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else:
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_CurlAsyncHTTPClient_fetch_impl = tornado.curl_httpclient.CurlAsyncHTTPClient.fetch_impl
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try:
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import aiohttp.client
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except ImportError: # pragma: no cover
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pass
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else:
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_AiohttpClientSessionRequest = aiohttp.client.ClientSession._request
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class CassettePatcherBuilder(object):
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def _build_patchers_from_mock_triples_decorator(function):
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@functools.wraps(function)
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def wrapped(self, *args, **kwargs):
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return self._build_patchers_from_mock_triples(function(self, *args, **kwargs))
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return wrapped
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def __init__(self, cassette):
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self._cassette = cassette
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self._class_to_cassette_subclass = {}
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def build(self):
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return itertools.chain(
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self._httplib(),
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self._requests(),
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self._boto3(),
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self._urllib3(),
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self._httplib2(),
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self._boto(),
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self._tornado(),
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self._aiohttp(),
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self._build_patchers_from_mock_triples(self._cassette.custom_patches),
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)
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def _build_patchers_from_mock_triples(self, mock_triples):
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for args in mock_triples:
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patcher = self._build_patcher(*args)
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if patcher:
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yield patcher
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def _build_patcher(self, obj, patched_attribute, replacement_class):
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if not hasattr(obj, patched_attribute):
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return
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return mock.patch.object(
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obj, patched_attribute, self._recursively_apply_get_cassette_subclass(replacement_class)
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)
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def _recursively_apply_get_cassette_subclass(self, replacement_dict_or_obj):
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"""One of the subtleties of this class is that it does not directly
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replace HTTPSConnection with `VCRRequestsHTTPSConnection`, but a
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subclass of the aforementioned class that has the `cassette`
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class attribute assigned to `self._cassette`. This behavior is
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necessary to properly support nested cassette contexts.
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This function exists to ensure that we use the same class
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object (reference) to patch everything that replaces
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VCRRequestHTTP[S]Connection, but that we can talk about
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patching them with the raw references instead, and without
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worrying about exactly where the subclass with the relevant
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value for `cassette` is first created.
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The function is recursive because it looks in to dictionaries
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and replaces class values at any depth with the subclass
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described in the previous paragraph.
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"""
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if isinstance(replacement_dict_or_obj, dict):
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for key, replacement_obj in replacement_dict_or_obj.items():
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replacement_obj = self._recursively_apply_get_cassette_subclass(replacement_obj)
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replacement_dict_or_obj[key] = replacement_obj
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return replacement_dict_or_obj
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if hasattr(replacement_dict_or_obj, "cassette"):
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replacement_dict_or_obj = self._get_cassette_subclass(replacement_dict_or_obj)
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return replacement_dict_or_obj
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def _get_cassette_subclass(self, klass):
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if klass.cassette is not None:
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return klass
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if klass not in self._class_to_cassette_subclass:
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subclass = self._build_cassette_subclass(klass)
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self._class_to_cassette_subclass[klass] = subclass
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return self._class_to_cassette_subclass[klass]
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def _build_cassette_subclass(self, base_class):
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bases = (base_class,)
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if not issubclass(base_class, object): # Check for old style class
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bases += (object,)
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return type(
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"{}{}".format(base_class.__name__, self._cassette._path), bases, dict(cassette=self._cassette)
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)
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@_build_patchers_from_mock_triples_decorator
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def _httplib(self):
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yield httplib, "HTTPConnection", VCRHTTPConnection
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yield httplib, "HTTPSConnection", VCRHTTPSConnection
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def _requests(self):
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try:
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from .stubs import requests_stubs
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except ImportError: # pragma: no cover
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return ()
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return self._urllib3_patchers(cpool, requests_stubs)
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@_build_patchers_from_mock_triples_decorator
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def _boto3(self):
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try:
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# botocore using awsrequest
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import botocore.awsrequest as cpool
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except ImportError: # pragma: no cover
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try:
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# botocore using vendored requests
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import botocore.vendored.requests.packages.urllib3.connectionpool as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs import boto3_stubs
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yield self._urllib3_patchers(cpool, boto3_stubs)
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else:
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from .stubs import boto3_stubs
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log.debug("Patching boto3 cpool with %s", cpool)
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yield cpool.AWSHTTPConnectionPool, "ConnectionCls", boto3_stubs.VCRRequestsHTTPConnection
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yield cpool.AWSHTTPSConnectionPool, "ConnectionCls", boto3_stubs.VCRRequestsHTTPSConnection
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def _patched_get_conn(self, connection_pool_class, connection_class_getter):
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get_conn = connection_pool_class._get_conn
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@functools.wraps(get_conn)
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def patched_get_conn(pool, timeout=None):
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connection = get_conn(pool, timeout)
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connection_class = (
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pool.ConnectionCls if hasattr(pool, "ConnectionCls") else connection_class_getter()
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)
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# We need to make sure that we are actually providing a
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# patched version of the connection class. This might not
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# always be the case because the pool keeps previously
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# used connections (which might actually be of a different
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# class) around. This while loop will terminate because
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# eventually the pool will run out of connections.
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while not isinstance(connection, connection_class):
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connection = get_conn(pool, timeout)
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return connection
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return patched_get_conn
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def _patched_new_conn(self, connection_pool_class, connection_remover):
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new_conn = connection_pool_class._new_conn
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@functools.wraps(new_conn)
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def patched_new_conn(pool):
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new_connection = new_conn(pool)
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connection_remover.add_connection_to_pool_entry(pool, new_connection)
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return new_connection
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return patched_new_conn
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def _urllib3(self):
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try:
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import urllib3.connectionpool as cpool
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except ImportError: # pragma: no cover
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return ()
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from .stubs import urllib3_stubs
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return self._urllib3_patchers(cpool, urllib3_stubs)
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@_build_patchers_from_mock_triples_decorator
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def _httplib2(self):
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try:
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import httplib2 as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs.httplib2_stubs import VCRHTTPConnectionWithTimeout
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from .stubs.httplib2_stubs import VCRHTTPSConnectionWithTimeout
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yield cpool, "HTTPConnectionWithTimeout", VCRHTTPConnectionWithTimeout
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yield cpool, "HTTPSConnectionWithTimeout", VCRHTTPSConnectionWithTimeout
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yield cpool, "SCHEME_TO_CONNECTION", {
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"http": VCRHTTPConnectionWithTimeout,
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"https": VCRHTTPSConnectionWithTimeout,
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}
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@_build_patchers_from_mock_triples_decorator
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def _boto(self):
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try:
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import boto.https_connection as cpool
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs.boto_stubs import VCRCertValidatingHTTPSConnection
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yield cpool, "CertValidatingHTTPSConnection", VCRCertValidatingHTTPSConnection
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@_build_patchers_from_mock_triples_decorator
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def _tornado(self):
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try:
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import tornado.simple_httpclient as simple
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs.tornado_stubs import vcr_fetch_impl
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new_fetch_impl = vcr_fetch_impl(self._cassette, _SimpleAsyncHTTPClient_fetch_impl)
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yield simple.SimpleAsyncHTTPClient, "fetch_impl", new_fetch_impl
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try:
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import tornado.curl_httpclient as curl
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs.tornado_stubs import vcr_fetch_impl
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new_fetch_impl = vcr_fetch_impl(self._cassette, _CurlAsyncHTTPClient_fetch_impl)
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yield curl.CurlAsyncHTTPClient, "fetch_impl", new_fetch_impl
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@_build_patchers_from_mock_triples_decorator
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def _aiohttp(self):
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try:
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import aiohttp.client as client
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except ImportError: # pragma: no cover
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pass
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else:
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from .stubs.aiohttp_stubs import vcr_request
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new_request = vcr_request(self._cassette, _AiohttpClientSessionRequest)
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yield client.ClientSession, "_request", new_request
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def _urllib3_patchers(self, cpool, stubs):
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http_connection_remover = ConnectionRemover(
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self._get_cassette_subclass(stubs.VCRRequestsHTTPConnection)
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)
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https_connection_remover = ConnectionRemover(
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self._get_cassette_subclass(stubs.VCRRequestsHTTPSConnection)
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)
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mock_triples = (
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(cpool, "VerifiedHTTPSConnection", stubs.VCRRequestsHTTPSConnection),
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(cpool, "HTTPConnection", stubs.VCRRequestsHTTPConnection),
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(cpool, "HTTPSConnection", stubs.VCRRequestsHTTPSConnection),
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(cpool, "is_connection_dropped", mock.Mock(return_value=False)), # Needed on Windows only
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(cpool.HTTPConnectionPool, "ConnectionCls", stubs.VCRRequestsHTTPConnection),
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(cpool.HTTPSConnectionPool, "ConnectionCls", stubs.VCRRequestsHTTPSConnection),
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)
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# These handle making sure that sessions only use the
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# connections of the appropriate type.
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mock_triples += (
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(
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cpool.HTTPConnectionPool,
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"_get_conn",
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self._patched_get_conn(cpool.HTTPConnectionPool, lambda: cpool.HTTPConnection),
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),
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(
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cpool.HTTPSConnectionPool,
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"_get_conn",
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self._patched_get_conn(cpool.HTTPSConnectionPool, lambda: cpool.HTTPSConnection),
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),
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(
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cpool.HTTPConnectionPool,
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"_new_conn",
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self._patched_new_conn(cpool.HTTPConnectionPool, http_connection_remover),
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),
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(
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cpool.HTTPSConnectionPool,
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"_new_conn",
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self._patched_new_conn(cpool.HTTPSConnectionPool, https_connection_remover),
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),
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)
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return itertools.chain(
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self._build_patchers_from_mock_triples(mock_triples),
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(http_connection_remover, https_connection_remover),
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)
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class ConnectionRemover(object):
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def __init__(self, connection_class):
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self._connection_class = connection_class
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self._connection_pool_to_connections = {}
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def add_connection_to_pool_entry(self, pool, connection):
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if isinstance(connection, self._connection_class):
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self._connection_pool_to_connections.setdefault(pool, set()).add(connection)
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def remove_connection_to_pool_entry(self, pool, connection):
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if isinstance(connection, self._connection_class):
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self._connection_pool_to_connections[self._connection_class].remove(connection)
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def __enter__(self):
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return self
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def __exit__(self, *args):
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for pool, connections in self._connection_pool_to_connections.items():
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readd_connections = []
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while pool.pool and not pool.pool.empty() and connections:
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connection = pool.pool.get()
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if isinstance(connection, self._connection_class):
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connections.remove(connection)
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else:
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readd_connections.append(connection)
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for connection in readd_connections:
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pool._put_conn(connection)
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def reset_patchers():
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yield mock.patch.object(httplib, "HTTPConnection", _HTTPConnection)
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yield mock.patch.object(httplib, "HTTPSConnection", _HTTPSConnection)
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try:
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import requests
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if requests.__build__ < 0x021603:
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# Avoid double unmock if requests 2.16.3
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# First, this is pointless, requests.packages.urllib3 *IS* urllib3 (see packages.py)
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# Second, this is unmocking twice the same classes with different namespaces
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# and is creating weird issues and bugs:
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# > AssertionError: assert <class 'urllib3.connection.HTTPConnection'>
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# > is <class 'requests.packages.urllib3.connection.HTTPConnection'>
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# This assert should work!!!
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# Note that this also means that now, requests.packages is never imported
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# if requests 2.16.3 or greater is used with VCRPy.
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import requests.packages.urllib3.connectionpool as cpool
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else:
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raise ImportError("Skip requests not vendored anymore")
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except ImportError: # pragma: no cover
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pass
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else:
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# unpatch requests v1.x
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|
yield mock.patch.object(cpool, "VerifiedHTTPSConnection", _VerifiedHTTPSConnection)
|
||
|
yield mock.patch.object(cpool, "HTTPConnection", _cpoolHTTPConnection)
|
||
|
# unpatch requests v2.x
|
||
|
if hasattr(cpool.HTTPConnectionPool, "ConnectionCls"):
|
||
|
yield mock.patch.object(cpool.HTTPConnectionPool, "ConnectionCls", _cpoolHTTPConnection)
|
||
|
yield mock.patch.object(cpool.HTTPSConnectionPool, "ConnectionCls", _cpoolHTTPSConnection)
|
||
|
|
||
|
if hasattr(cpool, "HTTPSConnection"):
|
||
|
yield mock.patch.object(cpool, "HTTPSConnection", _cpoolHTTPSConnection)
|
||
|
|
||
|
try:
|
||
|
import urllib3.connectionpool as cpool
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
yield mock.patch.object(cpool, "VerifiedHTTPSConnection", _VerifiedHTTPSConnection)
|
||
|
yield mock.patch.object(cpool, "HTTPConnection", _cpoolHTTPConnection)
|
||
|
yield mock.patch.object(cpool, "HTTPSConnection", _cpoolHTTPSConnection)
|
||
|
if hasattr(cpool.HTTPConnectionPool, "ConnectionCls"):
|
||
|
yield mock.patch.object(cpool.HTTPConnectionPool, "ConnectionCls", _cpoolHTTPConnection)
|
||
|
yield mock.patch.object(cpool.HTTPSConnectionPool, "ConnectionCls", _cpoolHTTPSConnection)
|
||
|
|
||
|
try:
|
||
|
# unpatch botocore with awsrequest
|
||
|
import botocore.awsrequest as cpool
|
||
|
except ImportError: # pragma: no cover
|
||
|
try:
|
||
|
# unpatch botocore with vendored requests
|
||
|
import botocore.vendored.requests.packages.urllib3.connectionpool as cpool
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
# unpatch requests v1.x
|
||
|
yield mock.patch.object(cpool, "VerifiedHTTPSConnection", _Boto3VerifiedHTTPSConnection)
|
||
|
yield mock.patch.object(cpool, "HTTPConnection", _cpoolBoto3HTTPConnection)
|
||
|
# unpatch requests v2.x
|
||
|
if hasattr(cpool.HTTPConnectionPool, "ConnectionCls"):
|
||
|
yield mock.patch.object(cpool.HTTPConnectionPool, "ConnectionCls", _cpoolBoto3HTTPConnection)
|
||
|
yield mock.patch.object(
|
||
|
cpool.HTTPSConnectionPool, "ConnectionCls", _cpoolBoto3HTTPSConnection
|
||
|
)
|
||
|
|
||
|
if hasattr(cpool, "HTTPSConnection"):
|
||
|
yield mock.patch.object(cpool, "HTTPSConnection", _cpoolBoto3HTTPSConnection)
|
||
|
else:
|
||
|
if hasattr(cpool.AWSHTTPConnectionPool, "ConnectionCls"):
|
||
|
yield mock.patch.object(cpool.AWSHTTPConnectionPool, "ConnectionCls", _cpoolBoto3HTTPConnection)
|
||
|
yield mock.patch.object(cpool.AWSHTTPSConnectionPool, "ConnectionCls", _cpoolBoto3HTTPSConnection)
|
||
|
|
||
|
if hasattr(cpool, "AWSHTTPSConnection"):
|
||
|
yield mock.patch.object(cpool, "AWSHTTPSConnection", _cpoolBoto3HTTPSConnection)
|
||
|
|
||
|
try:
|
||
|
import httplib2 as cpool
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
yield mock.patch.object(cpool, "HTTPConnectionWithTimeout", _HTTPConnectionWithTimeout)
|
||
|
yield mock.patch.object(cpool, "HTTPSConnectionWithTimeout", _HTTPSConnectionWithTimeout)
|
||
|
yield mock.patch.object(cpool, "SCHEME_TO_CONNECTION", _SCHEME_TO_CONNECTION)
|
||
|
|
||
|
try:
|
||
|
import boto.https_connection as cpool
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
yield mock.patch.object(cpool, "CertValidatingHTTPSConnection", _CertValidatingHTTPSConnection)
|
||
|
|
||
|
try:
|
||
|
import tornado.simple_httpclient as simple
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
yield mock.patch.object(simple.SimpleAsyncHTTPClient, "fetch_impl", _SimpleAsyncHTTPClient_fetch_impl)
|
||
|
try:
|
||
|
import tornado.curl_httpclient as curl
|
||
|
except ImportError: # pragma: no cover
|
||
|
pass
|
||
|
else:
|
||
|
yield mock.patch.object(curl.CurlAsyncHTTPClient, "fetch_impl", _CurlAsyncHTTPClient_fetch_impl)
|
||
|
|
||
|
|
||
|
@contextlib.contextmanager
|
||
|
def force_reset():
|
||
|
with contextlib.ExitStack() as exit_stack:
|
||
|
for patcher in reset_patchers():
|
||
|
exit_stack.enter_context(patcher)
|
||
|
yield
|