mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-15 17:35:04 +00:00
314 lines
11 KiB
Python
314 lines
11 KiB
Python
"""
|
|
This module provides a pool manager that uses Google App Engine's
|
|
`URLFetch Service <https://cloud.google.com/appengine/docs/python/urlfetch>`_.
|
|
|
|
Example usage::
|
|
|
|
from urllib3 import PoolManager
|
|
from urllib3.contrib.appengine import AppEngineManager, is_appengine_sandbox
|
|
|
|
if is_appengine_sandbox():
|
|
# AppEngineManager uses AppEngine's URLFetch API behind the scenes
|
|
http = AppEngineManager()
|
|
else:
|
|
# PoolManager uses a socket-level API behind the scenes
|
|
http = PoolManager()
|
|
|
|
r = http.request('GET', 'https://google.com/')
|
|
|
|
There are `limitations <https://cloud.google.com/appengine/docs/python/\
|
|
urlfetch/#Python_Quotas_and_limits>`_ to the URLFetch service and it may not be
|
|
the best choice for your application. There are three options for using
|
|
urllib3 on Google App Engine:
|
|
|
|
1. You can use :class:`AppEngineManager` with URLFetch. URLFetch is
|
|
cost-effective in many circumstances as long as your usage is within the
|
|
limitations.
|
|
2. You can use a normal :class:`~urllib3.PoolManager` by enabling sockets.
|
|
Sockets also have `limitations and restrictions
|
|
<https://cloud.google.com/appengine/docs/python/sockets/\
|
|
#limitations-and-restrictions>`_ and have a lower free quota than URLFetch.
|
|
To use sockets, be sure to specify the following in your ``app.yaml``::
|
|
|
|
env_variables:
|
|
GAE_USE_SOCKETS_HTTPLIB : 'true'
|
|
|
|
3. If you are using `App Engine Flexible
|
|
<https://cloud.google.com/appengine/docs/flexible/>`_, you can use the standard
|
|
:class:`PoolManager` without any configuration or special environment variables.
|
|
"""
|
|
|
|
from __future__ import absolute_import
|
|
|
|
import io
|
|
import logging
|
|
import warnings
|
|
|
|
from ..exceptions import (
|
|
HTTPError,
|
|
HTTPWarning,
|
|
MaxRetryError,
|
|
ProtocolError,
|
|
SSLError,
|
|
TimeoutError,
|
|
)
|
|
from ..packages.six.moves.urllib.parse import urljoin
|
|
from ..request import RequestMethods
|
|
from ..response import HTTPResponse
|
|
from ..util.retry import Retry
|
|
from ..util.timeout import Timeout
|
|
from . import _appengine_environ
|
|
|
|
try:
|
|
from google.appengine.api import urlfetch
|
|
except ImportError:
|
|
urlfetch = None
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class AppEnginePlatformWarning(HTTPWarning):
|
|
pass
|
|
|
|
|
|
class AppEnginePlatformError(HTTPError):
|
|
pass
|
|
|
|
|
|
class AppEngineManager(RequestMethods):
|
|
"""
|
|
Connection manager for Google App Engine sandbox applications.
|
|
|
|
This manager uses the URLFetch service directly instead of using the
|
|
emulated httplib, and is subject to URLFetch limitations as described in
|
|
the App Engine documentation `here
|
|
<https://cloud.google.com/appengine/docs/python/urlfetch>`_.
|
|
|
|
Notably it will raise an :class:`AppEnginePlatformError` if:
|
|
* URLFetch is not available.
|
|
* If you attempt to use this on App Engine Flexible, as full socket
|
|
support is available.
|
|
* If a request size is more than 10 megabytes.
|
|
* If a response size is more than 32 megabytes.
|
|
* If you use an unsupported request method such as OPTIONS.
|
|
|
|
Beyond those cases, it will raise normal urllib3 errors.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
headers=None,
|
|
retries=None,
|
|
validate_certificate=True,
|
|
urlfetch_retries=True,
|
|
):
|
|
if not urlfetch:
|
|
raise AppEnginePlatformError(
|
|
"URLFetch is not available in this environment."
|
|
)
|
|
|
|
warnings.warn(
|
|
"urllib3 is using URLFetch on Google App Engine sandbox instead "
|
|
"of sockets. To use sockets directly instead of URLFetch see "
|
|
"https://urllib3.readthedocs.io/en/1.26.x/reference/urllib3.contrib.html.",
|
|
AppEnginePlatformWarning,
|
|
)
|
|
|
|
RequestMethods.__init__(self, headers)
|
|
self.validate_certificate = validate_certificate
|
|
self.urlfetch_retries = urlfetch_retries
|
|
|
|
self.retries = retries or Retry.DEFAULT
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_val, exc_tb):
|
|
# Return False to re-raise any potential exceptions
|
|
return False
|
|
|
|
def urlopen(
|
|
self,
|
|
method,
|
|
url,
|
|
body=None,
|
|
headers=None,
|
|
retries=None,
|
|
redirect=True,
|
|
timeout=Timeout.DEFAULT_TIMEOUT,
|
|
**response_kw
|
|
):
|
|
|
|
retries = self._get_retries(retries, redirect)
|
|
|
|
try:
|
|
follow_redirects = redirect and retries.redirect != 0 and retries.total
|
|
response = urlfetch.fetch(
|
|
url,
|
|
payload=body,
|
|
method=method,
|
|
headers=headers or {},
|
|
allow_truncated=False,
|
|
follow_redirects=self.urlfetch_retries and follow_redirects,
|
|
deadline=self._get_absolute_timeout(timeout),
|
|
validate_certificate=self.validate_certificate,
|
|
)
|
|
except urlfetch.DeadlineExceededError as e:
|
|
raise TimeoutError(self, e)
|
|
|
|
except urlfetch.InvalidURLError as e:
|
|
if "too large" in str(e):
|
|
raise AppEnginePlatformError(
|
|
"URLFetch request too large, URLFetch only "
|
|
"supports requests up to 10mb in size.",
|
|
e,
|
|
)
|
|
raise ProtocolError(e)
|
|
|
|
except urlfetch.DownloadError as e:
|
|
if "Too many redirects" in str(e):
|
|
raise MaxRetryError(self, url, reason=e)
|
|
raise ProtocolError(e)
|
|
|
|
except urlfetch.ResponseTooLargeError as e:
|
|
raise AppEnginePlatformError(
|
|
"URLFetch response too large, URLFetch only supports"
|
|
"responses up to 32mb in size.",
|
|
e,
|
|
)
|
|
|
|
except urlfetch.SSLCertificateError as e:
|
|
raise SSLError(e)
|
|
|
|
except urlfetch.InvalidMethodError as e:
|
|
raise AppEnginePlatformError(
|
|
"URLFetch does not support method: %s" % method, e
|
|
)
|
|
|
|
http_response = self._urlfetch_response_to_http_response(
|
|
response, retries=retries, **response_kw
|
|
)
|
|
|
|
# Handle redirect?
|
|
redirect_location = redirect and http_response.get_redirect_location()
|
|
if redirect_location:
|
|
# Check for redirect response
|
|
if self.urlfetch_retries and retries.raise_on_redirect:
|
|
raise MaxRetryError(self, url, "too many redirects")
|
|
else:
|
|
if http_response.status == 303:
|
|
method = "GET"
|
|
|
|
try:
|
|
retries = retries.increment(
|
|
method, url, response=http_response, _pool=self
|
|
)
|
|
except MaxRetryError:
|
|
if retries.raise_on_redirect:
|
|
raise MaxRetryError(self, url, "too many redirects")
|
|
return http_response
|
|
|
|
retries.sleep_for_retry(http_response)
|
|
log.debug("Redirecting %s -> %s", url, redirect_location)
|
|
redirect_url = urljoin(url, redirect_location)
|
|
return self.urlopen(
|
|
method,
|
|
redirect_url,
|
|
body,
|
|
headers,
|
|
retries=retries,
|
|
redirect=redirect,
|
|
timeout=timeout,
|
|
**response_kw
|
|
)
|
|
|
|
# Check if we should retry the HTTP response.
|
|
has_retry_after = bool(http_response.headers.get("Retry-After"))
|
|
if retries.is_retry(method, http_response.status, has_retry_after):
|
|
retries = retries.increment(method, url, response=http_response, _pool=self)
|
|
log.debug("Retry: %s", url)
|
|
retries.sleep(http_response)
|
|
return self.urlopen(
|
|
method,
|
|
url,
|
|
body=body,
|
|
headers=headers,
|
|
retries=retries,
|
|
redirect=redirect,
|
|
timeout=timeout,
|
|
**response_kw
|
|
)
|
|
|
|
return http_response
|
|
|
|
def _urlfetch_response_to_http_response(self, urlfetch_resp, **response_kw):
|
|
|
|
if is_prod_appengine():
|
|
# Production GAE handles deflate encoding automatically, but does
|
|
# not remove the encoding header.
|
|
content_encoding = urlfetch_resp.headers.get("content-encoding")
|
|
|
|
if content_encoding == "deflate":
|
|
del urlfetch_resp.headers["content-encoding"]
|
|
|
|
transfer_encoding = urlfetch_resp.headers.get("transfer-encoding")
|
|
# We have a full response's content,
|
|
# so let's make sure we don't report ourselves as chunked data.
|
|
if transfer_encoding == "chunked":
|
|
encodings = transfer_encoding.split(",")
|
|
encodings.remove("chunked")
|
|
urlfetch_resp.headers["transfer-encoding"] = ",".join(encodings)
|
|
|
|
original_response = HTTPResponse(
|
|
# In order for decoding to work, we must present the content as
|
|
# a file-like object.
|
|
body=io.BytesIO(urlfetch_resp.content),
|
|
msg=urlfetch_resp.header_msg,
|
|
headers=urlfetch_resp.headers,
|
|
status=urlfetch_resp.status_code,
|
|
**response_kw
|
|
)
|
|
|
|
return HTTPResponse(
|
|
body=io.BytesIO(urlfetch_resp.content),
|
|
headers=urlfetch_resp.headers,
|
|
status=urlfetch_resp.status_code,
|
|
original_response=original_response,
|
|
**response_kw
|
|
)
|
|
|
|
def _get_absolute_timeout(self, timeout):
|
|
if timeout is Timeout.DEFAULT_TIMEOUT:
|
|
return None # Defer to URLFetch's default.
|
|
if isinstance(timeout, Timeout):
|
|
if timeout._read is not None or timeout._connect is not None:
|
|
warnings.warn(
|
|
"URLFetch does not support granular timeout settings, "
|
|
"reverting to total or default URLFetch timeout.",
|
|
AppEnginePlatformWarning,
|
|
)
|
|
return timeout.total
|
|
return timeout
|
|
|
|
def _get_retries(self, retries, redirect):
|
|
if not isinstance(retries, Retry):
|
|
retries = Retry.from_int(retries, redirect=redirect, default=self.retries)
|
|
|
|
if retries.connect or retries.read or retries.redirect:
|
|
warnings.warn(
|
|
"URLFetch only supports total retries and does not "
|
|
"recognize connect, read, or redirect retry parameters.",
|
|
AppEnginePlatformWarning,
|
|
)
|
|
|
|
return retries
|
|
|
|
|
|
# Alias methods from _appengine_environ to maintain public API interface.
|
|
|
|
is_appengine = _appengine_environ.is_appengine
|
|
is_appengine_sandbox = _appengine_environ.is_appengine_sandbox
|
|
is_local_appengine = _appengine_environ.is_local_appengine
|
|
is_prod_appengine = _appengine_environ.is_prod_appengine
|
|
is_prod_appengine_mvms = _appengine_environ.is_prod_appengine_mvms
|