Viewing file:  mock_http.py (4.37 KB) -rw-r--r--
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#!/usr/bin/python
#
# Copyright (C) 2008 Google Inc.
#
# 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.
__author__ = 'api.jscudder (Jeff Scudder)'
import atom.http_interface
import atom.url
class Error(Exception):
pass
class NoRecordingFound(Error):
pass
class MockRequest(object):
"""Holds parameters of an HTTP request for matching against future requests.
"""
def __init__(self, operation, url, data=None, headers=None):
self.operation = operation
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
self.url = url
self.data = data
self.headers = headers
class MockResponse(atom.http_interface.HttpResponse):
"""Simulates an httplib.HTTPResponse object."""
def __init__(self, body=None, status=None, reason=None, headers=None):
if body and hasattr(body, 'read'):
self.body = body.read()
else:
self.body = body
if status is not None:
self.status = int(status)
else:
self.status = None
self.reason = reason
self._headers = headers or {}
def read(self):
return self.body
class MockHttpClient(atom.http_interface.GenericHttpClient):
def __init__(self, headers=None, recordings=None, real_client=None):
"""An HttpClient which responds to request with stored data.
The request-response pairs are stored as tuples in a member list named
recordings.
The MockHttpClient can be switched from replay mode to record mode by
setting the real_client member to an instance of an HttpClient which will
make real HTTP requests and store the server's response in list of
recordings.
Args:
headers: dict containing HTTP headers which should be included in all
HTTP requests.
recordings: The initial recordings to be used for responses. This list
contains tuples in the form: (MockRequest, MockResponse)
real_client: An HttpClient which will make a real HTTP request. The
response will be converted into a MockResponse and stored in
recordings.
"""
self.recordings = recordings or []
self.real_client = real_client
self.headers = headers or {}
def add_response(self, response, operation, url, data=None, headers=None):
"""Adds a request-response pair to the recordings list.
After the recording is added, future matching requests will receive the
response.
Args:
response: MockResponse
operation: str
url: str
data: str, Currently the data is ignored when looking for matching
requests.
headers: dict of strings: Currently the headers are ignored when
looking for matching requests.
"""
request = MockRequest(operation, url, data=data, headers=headers)
self.recordings.append((request, response))
def request(self, operation, url, data=None, headers=None):
"""Returns a matching MockResponse from the recordings.
If the real_client is set, the request will be passed along and the
server's response will be added to the recordings and also returned.
If there is no match, a NoRecordingFound error will be raised.
"""
if self.real_client is None:
if isinstance(url, (str, unicode)):
url = atom.url.parse_url(url)
for recording in self.recordings:
if recording[0].operation == operation and recording[0].url == url:
return recording[1]
raise NoRecordingFound('No recodings found for %s %s' % (
operation, url))
else:
# There is a real HTTP client, so make the request, and record the
# response.
response = self.real_client.request(operation, url, data=data,
headers=headers)
# TODO: copy the headers
stored_response = MockResponse(body=response, status=response.status,
reason=response.reason)
self.add_response(stored_response, operation, url, data=data,
headers=headers)
return stored_response
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