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232 lines
7.8 KiB
Python
232 lines
7.8 KiB
Python
from __future__ import absolute_import
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import logging
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import os
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import warnings
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from ..exceptions import (
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HTTPError,
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HTTPWarning,
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MaxRetryError,
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ProtocolError,
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TimeoutError,
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SSLError
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)
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from ..packages.six import BytesIO
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from ..request import RequestMethods
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from ..response import HTTPResponse
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from ..util.timeout import Timeout
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from ..util.retry import Retry
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try:
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from google.appengine.api import urlfetch
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except ImportError:
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urlfetch = None
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log = logging.getLogger(__name__)
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class AppEnginePlatformWarning(HTTPWarning):
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pass
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class AppEnginePlatformError(HTTPError):
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pass
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class AppEngineManager(RequestMethods):
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"""
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Connection manager for Google App Engine sandbox applications.
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This manager uses the URLFetch service directly instead of using the
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emulated httplib, and is subject to URLFetch limitations as described in
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the App Engine documentation here:
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https://cloud.google.com/appengine/docs/python/urlfetch
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Notably it will raise an AppEnginePlatformError if:
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* URLFetch is not available.
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* If you attempt to use this on GAEv2 (Managed VMs), as full socket
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support is available.
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* If a request size is more than 10 megabytes.
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* If a response size is more than 32 megabtyes.
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* If you use an unsupported request method such as OPTIONS.
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Beyond those cases, it will raise normal urllib3 errors.
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"""
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def __init__(self, headers=None, retries=None, validate_certificate=True):
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if not urlfetch:
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raise AppEnginePlatformError(
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"URLFetch is not available in this environment.")
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if is_prod_appengine_mvms():
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raise AppEnginePlatformError(
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"Use normal urllib3.PoolManager instead of AppEngineManager"
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"on Managed VMs, as using URLFetch is not necessary in "
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"this environment.")
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warnings.warn(
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"urllib3 is using URLFetch on Google App Engine sandbox instead "
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"of sockets. To use sockets directly instead of URLFetch see "
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"https://urllib3.readthedocs.io/en/latest/contrib.html.",
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AppEnginePlatformWarning)
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RequestMethods.__init__(self, headers)
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self.validate_certificate = validate_certificate
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self.retries = retries or Retry.DEFAULT
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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# Return False to re-raise any potential exceptions
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return False
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def urlopen(self, method, url, body=None, headers=None,
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retries=None, redirect=True, timeout=Timeout.DEFAULT_TIMEOUT,
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**response_kw):
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retries = self._get_retries(retries, redirect)
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try:
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response = urlfetch.fetch(
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url,
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payload=body,
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method=method,
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headers=headers or {},
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allow_truncated=False,
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follow_redirects=(
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redirect and
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retries.redirect != 0 and
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retries.total),
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deadline=self._get_absolute_timeout(timeout),
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validate_certificate=self.validate_certificate,
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)
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except urlfetch.DeadlineExceededError as e:
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raise TimeoutError(self, e)
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except urlfetch.InvalidURLError as e:
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if 'too large' in str(e):
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raise AppEnginePlatformError(
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"URLFetch request too large, URLFetch only "
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"supports requests up to 10mb in size.", e)
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raise ProtocolError(e)
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except urlfetch.DownloadError as e:
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if 'Too many redirects' in str(e):
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raise MaxRetryError(self, url, reason=e)
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raise ProtocolError(e)
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except urlfetch.ResponseTooLargeError as e:
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raise AppEnginePlatformError(
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"URLFetch response too large, URLFetch only supports"
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"responses up to 32mb in size.", e)
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except urlfetch.SSLCertificateError as e:
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raise SSLError(e)
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except urlfetch.InvalidMethodError as e:
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raise AppEnginePlatformError(
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"URLFetch does not support method: %s" % method, e)
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http_response = self._urlfetch_response_to_http_response(
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response, **response_kw)
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# Check for redirect response
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if (http_response.get_redirect_location() and
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retries.raise_on_redirect and redirect):
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raise MaxRetryError(self, url, "too many redirects")
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# Check if we should retry the HTTP response.
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if retries.is_forced_retry(method, status_code=http_response.status):
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retries = retries.increment(
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method, url, response=http_response, _pool=self)
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log.info("Forced retry: %s", url)
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retries.sleep()
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return self.urlopen(
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method, url,
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body=body, headers=headers,
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retries=retries, redirect=redirect,
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timeout=timeout, **response_kw)
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return http_response
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def _urlfetch_response_to_http_response(self, urlfetch_resp, **response_kw):
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if is_prod_appengine():
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# Production GAE handles deflate encoding automatically, but does
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# not remove the encoding header.
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content_encoding = urlfetch_resp.headers.get('content-encoding')
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if content_encoding == 'deflate':
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del urlfetch_resp.headers['content-encoding']
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transfer_encoding = urlfetch_resp.headers.get('transfer-encoding')
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# We have a full response's content,
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# so let's make sure we don't report ourselves as chunked data.
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if transfer_encoding == 'chunked':
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encodings = transfer_encoding.split(",")
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encodings.remove('chunked')
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urlfetch_resp.headers['transfer-encoding'] = ','.join(encodings)
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return HTTPResponse(
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# In order for decoding to work, we must present the content as
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# a file-like object.
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body=BytesIO(urlfetch_resp.content),
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headers=urlfetch_resp.headers,
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status=urlfetch_resp.status_code,
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**response_kw
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)
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def _get_absolute_timeout(self, timeout):
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if timeout is Timeout.DEFAULT_TIMEOUT:
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return 5 # 5s is the default timeout for URLFetch.
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if isinstance(timeout, Timeout):
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if timeout._read is not timeout._connect:
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warnings.warn(
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"URLFetch does not support granular timeout settings, "
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"reverting to total timeout.", AppEnginePlatformWarning)
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return timeout.total
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return timeout
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def _get_retries(self, retries, redirect):
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if not isinstance(retries, Retry):
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retries = Retry.from_int(
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retries, redirect=redirect, default=self.retries)
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if retries.connect or retries.read or retries.redirect:
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warnings.warn(
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"URLFetch only supports total retries and does not "
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"recognize connect, read, or redirect retry parameters.",
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AppEnginePlatformWarning)
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return retries
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def is_appengine():
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return (is_local_appengine() or
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is_prod_appengine() or
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is_prod_appengine_mvms())
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def is_appengine_sandbox():
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return is_appengine() and not is_prod_appengine_mvms()
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def is_local_appengine():
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return ('APPENGINE_RUNTIME' in os.environ and
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'Development/' in os.environ['SERVER_SOFTWARE'])
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def is_prod_appengine():
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return ('APPENGINE_RUNTIME' in os.environ and
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'Google App Engine/' in os.environ['SERVER_SOFTWARE'] and
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not is_prod_appengine_mvms())
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def is_prod_appengine_mvms():
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return os.environ.get('GAE_VM', False) == 'true'
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