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import re
import time
import requests
import six
from requests import Request, Response
from requests.auth import HTTPBasicAuth
from requests.exceptions import (InvalidSchema, InvalidURL, MissingSchema,
RequestException)
from six.moves.urllib.parse import urlparse, urlunparse
from . import events
from .exception import CatchResponseError, ResponseError
absolute_http_url_regexp = re.compile(r"^https?://", re.I)
class LocustResponse(Response):
def raise_for_status(self):
if hasattr(self, 'error') and self.error:
raise self.error
Response.raise_for_status(self)
class HttpSession(requests.Session):
"""
Class for performing web requests and holding (session-) cookies between requests (in order
to be able to log in and out of websites). Each request is logged so that locust can display
statistics.
This is a slightly extended version of `python-request <http://python-requests.org>`_'s
:py:class:`requests.Session` class and mostly this class works exactly the same. However
the methods for making requests (get, post, delete, put, head, options, patch, request)
can now take a *url* argument that's only the path part of the URL, in which case the host
part of the URL will be prepended with the HttpSession.base_url which is normally inherited
from a Locust class' host property.
Each of the methods for making requests also takes two additional optional arguments which
are Locust specific and doesn't exist in python-requests. These are:
:param name: (optional) An argument that can be specified to use as label in Locust's statistics instead of the URL path.
This can be used to group different URL's that are requested into a single entry in Locust's statistics.
:param catch_response: (optional) Boolean argument that, if set, can be used to make a request return a context manager
to work as argument to a with statement. This will allow the request to be marked as a fail based on the content of the
response, even if the response code is ok (2xx). The opposite also works, one can use catch_response to catch a request
and then mark it as successful even if the response code was not (i.e 500 or 404).
"""
def __init__(self, base_url, *args, **kwargs):
super(HttpSession, self).__init__(*args, **kwargs)
self.base_url = base_url
# Check for basic authentication
parsed_url = urlparse(self.base_url)
if parsed_url.username and parsed_url.password:
netloc = parsed_url.hostname
if parsed_url.port:
netloc += ":%d" % parsed_url.port
# remove username and password from the base_url
self.base_url = urlunparse((parsed_url.scheme, netloc, parsed_url.path, parsed_url.params, parsed_url.query, parsed_url.fragment))
# configure requests to use basic auth
self.auth = HTTPBasicAuth(parsed_url.username, parsed_url.password)
def _build_url(self, path):
""" prepend url with hostname unless it's already an absolute URL """
if absolute_http_url_regexp.match(path):
return path
else:
return "%s%s" % (self.base_url, path)
def request(self, method, url, name=None, catch_response=False, **kwargs):
"""
Constructs and sends a :py:class:`requests.Request`.
Returns :py:class:`requests.Response` object.
:param method: method for the new :class:`Request` object.
:param url: URL for the new :class:`Request` object.
:param name: (optional) An argument that can be specified to use as label in Locust's statistics instead of the URL path.
This can be used to group different URL's that are requested into a single entry in Locust's statistics.
:param catch_response: (optional) Boolean argument that, if set, can be used to make a request return a context manager
to work as argument to a with statement. This will allow the request to be marked as a fail based on the content of the
response, even if the response code is ok (2xx). The opposite also works, one can use catch_response to catch a request
and then mark it as successful even if the response code was not (i.e 500 or 404).
:param params: (optional) Dictionary or bytes to be sent in the query string for the :class:`Request`.
:param data: (optional) Dictionary or bytes to send in the body of the :class:`Request`.
:param headers: (optional) Dictionary of HTTP Headers to send with the :class:`Request`.
:param cookies: (optional) Dict or CookieJar object to send with the :class:`Request`.
:param files: (optional) Dictionary of ``'filename': file-like-objects`` for multipart encoding upload.
:param auth: (optional) Auth tuple or callable to enable Basic/Digest/Custom HTTP Auth.
:param timeout: (optional) How long in seconds to wait for the server to send data before giving up, as a float,
or a (`connect timeout, read timeout <user/advanced.html#timeouts>`_) tuple.
:type timeout: float or tuple
:param allow_redirects: (optional) Set to True by default.
:type allow_redirects: bool
:param proxies: (optional) Dictionary mapping protocol to the URL of the proxy.
:param stream: (optional) whether to immediately download the response content. Defaults to ``False``.
:param verify: (optional) if ``True``, the SSL cert will be verified. A CA_BUNDLE path can also be provided.
:param cert: (optional) if String, path to ssl client cert file (.pem). If Tuple, ('cert', 'key') pair.
"""
# prepend url with hostname unless it's already an absolute URL
url = self._build_url(url)
# store meta data that is used when reporting the request to locust's statistics
request_meta = {}
# set up pre_request hook for attaching meta data to the request object
request_meta["method"] = method
request_meta["start_time"] = time.time()
response = self._send_request_safe_mode(method, url, **kwargs)
# record the consumed time
request_meta["response_time"] = (time.time() - request_meta["start_time"]) * 1000
request_meta["name"] = name or (response.history and response.history[0] or response).request.path_url
# get the length of the content, but if the argument stream is set to True, we take
# the size from the content-length header, in order to not trigger fetching of the body
if kwargs.get("stream", False):
request_meta["content_size"] = int(response.headers.get("content-length") or 0)
else:
request_meta["content_size"] = len(response.content or b"")
if catch_response:
response.locust_request_meta = request_meta
return ResponseContextManager(response)
else:
try:
response.raise_for_status()
except RequestException as e:
events.request_failure.fire(
request_type=request_meta["method"],
name=request_meta["name"],
response_time=request_meta["response_time"],
exception=e,
)
else:
events.request_success.fire(
request_type=request_meta["method"],
name=request_meta["name"],
response_time=request_meta["response_time"],
response_length=request_meta["content_size"],
)
return response
def _send_request_safe_mode(self, method, url, **kwargs):
"""
Send an HTTP request, and catch any exception that might occur due to connection problems.
Safe mode has been removed from requests 1.x.
"""
try:
return requests.Session.request(self, method, url, **kwargs)
except (MissingSchema, InvalidSchema, InvalidURL):
raise
except RequestException as e:
r = LocustResponse()
r.error = e
r.status_code = 0 # with this status_code, content returns None
r.request = Request(method, url).prepare()
return r
class ResponseContextManager(LocustResponse):
"""
A Response class that also acts as a context manager that provides the ability to manually
control if an HTTP request should be marked as successful or a failure in Locust's statistics
This class is a subclass of :py:class:`Response <requests.Response>` with two additional
methods: :py:meth:`success <locust.clients.ResponseContextManager.success>` and
:py:meth:`failure <locust.clients.ResponseContextManager.failure>`.
"""
_is_reported = False
def __init__(self, response):
# copy data from response to this object
self.__dict__ = response.__dict__
def __enter__(self):
return self
def __exit__(self, exc, value, traceback):
if self._is_reported:
# if the user has already manually marked this response as failure or success
# we can ignore the default haviour of letting the response code determine the outcome
return exc is None
if exc:
if isinstance(value, ResponseError):
self.failure(value)
else:
return False
else:
try:
self.raise_for_status()
except requests.exceptions.RequestException as e:
self.failure(e)
else:
self.success()
return True
def success(self):
"""
Report the response as successful
Example::
with self.client.get("/does/not/exist", catch_response=True) as response:
if response.status_code == 404:
response.success()
"""
events.request_success.fire(
request_type=self.locust_request_meta["method"],
name=self.locust_request_meta["name"],
response_time=self.locust_request_meta["response_time"],
response_length=self.locust_request_meta["content_size"],
)
self._is_reported = True
def failure(self, exc):
"""
Report the response as a failure.
exc can be either a python exception, or a string in which case it will
be wrapped inside a CatchResponseError.
Example::
with self.client.get("/", catch_response=True) as response:
if response.content == b"":
response.failure("No data")
"""
if isinstance(exc, six.string_types):
exc = CatchResponseError(exc)
events.request_failure.fire(
request_type=self.locust_request_meta["method"],
name=self.locust_request_meta["name"],
response_time=self.locust_request_meta["response_time"],
exception=exc,
)
self._is_reported = True
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