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from __future__ import absolute_import, print_function
import os
import httplib
from httplib import (_CS_REQ_SENT, _CS_REQ_STARTED, CONTINUE, UnknownProtocol,
CannotSendHeader, NO_CONTENT, NOT_MODIFIED, EXPECTATION_FAILED,
HTTPMessage, HTTPException)
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
from .BaseUtils import encode_to_s3
_METHODS_EXPECTING_BODY = ['PATCH', 'POST', 'PUT']
# Fixed python 2.X httplib to be able to support
# Expect: 100-Continue http feature
# Inspired by:
# http://bugs.python.org/file26357/issue1346874-273.patch
def httpresponse_patched_begin(self):
""" Re-implemented httplib begin function
to not loop over "100 CONTINUE" status replies
but to report it to higher level so it can be processed.
"""
if self.msg is not None:
# we've already started reading the response
return
# read only one status even if we get a non-100 response
version, status, reason = self._read_status()
self.status = status
self.reason = reason.strip()
if version == 'HTTP/1.0':
self.version = 10
elif version.startswith('HTTP/1.'):
self.version = 11 # use HTTP/1.1 code for HTTP/1.x where x>=1
elif version == 'HTTP/0.9':
self.version = 9
else:
raise UnknownProtocol(version)
if self.version == 9:
self.length = None
self.chunked = 0
self.will_close = 1
self.msg = HTTPMessage(StringIO())
return
self.msg = HTTPMessage(self.fp, 0)
if self.debuglevel > 0:
for hdr in self.msg.headers:
print("header:", hdr, end=" ")
# don't let the msg keep an fp
self.msg.fp = None
# are we using the chunked-style of transfer encoding?
tr_enc = self.msg.getheader('transfer-encoding')
if tr_enc and tr_enc.lower() == "chunked":
self.chunked = 1
self.chunk_left = None
else:
self.chunked = 0
# will the connection close at the end of the response?
self.will_close = self._check_close()
# do we have a Content-Length?
# NOTE: RFC 2616, S4.4, #3 says we ignore this if tr_enc is "chunked"
length = self.msg.getheader('content-length')
if length and not self.chunked:
try:
self.length = int(length)
except ValueError:
self.length = None
else:
if self.length < 0: # ignore nonsensical negative lengths
self.length = None
else:
self.length = None
# does the body have a fixed length? (of zero)
if (status == NO_CONTENT or status == NOT_MODIFIED or
100 <= status < 200 or # 1xx codes
self._method == 'HEAD'):
self.length = 0
# if the connection remains open, and we aren't using chunked, and
# a content-length was not provided, then assume that the connection
# WILL close.
if not self.will_close and \
not self.chunked and \
self.length is None:
self.will_close = 1
def httpconnection_patched_set_content_length(self, body, method):
## REIMPLEMENTED because new in last httplib but needed by send_request
# Set the content-length based on the body. If the body is "empty", we
# set Content-Length: 0 for methods that expect a body (RFC 7230,
# Section 3.3.2). If the body is set for other methods, we set the
# header provided we can figure out what the length is.
thelen = None
if body is None and method.upper() in _METHODS_EXPECTING_BODY:
thelen = '0'
elif body is not None:
try:
thelen = str(len(body))
except (TypeError, AttributeError):
# If this is a file-like object, try to
# fstat its file descriptor
try:
thelen = str(os.fstat(body.fileno()).st_size)
except (AttributeError, OSError):
# Don't send a length if this failed
if self.debuglevel > 0: print("Cannot stat!!")
if thelen is not None:
self.putheader('Content-Length', thelen)
def httpconnection_patched_send_request(self, method, url, body, headers):
# Honor explicitly requested Host: and Accept-Encoding: headers.
header_names = dict.fromkeys([k.lower() for k in headers])
skips = {}
if 'host' in header_names:
skips['skip_host'] = 1
if 'accept-encoding' in header_names:
skips['skip_accept_encoding'] = 1
expect_continue = False
for hdr, value in headers.iteritems():
if 'expect' == hdr.lower() and '100-continue' in value.lower():
expect_continue = True
url = encode_to_s3(url)
self.putrequest(method, url, **skips)
if 'content-length' not in header_names:
self._set_content_length(body, method)
for hdr, value in headers.iteritems():
self.putheader(encode_to_s3(hdr), encode_to_s3(value))
# If an Expect: 100-continue was sent, we need to check for a 417
# Expectation Failed to avoid unnecessarily sending the body
# See RFC 2616 8.2.3
if not expect_continue:
self.endheaders(body)
else:
if not body:
raise HTTPException("A body is required when expecting "
"100-continue")
self.endheaders()
resp = self.getresponse()
resp.read()
self._HTTPConnection__state = _CS_REQ_SENT
if resp.status == EXPECTATION_FAILED:
raise ExpectationFailed()
elif resp.status == CONTINUE:
self.send(body)
def httpconnection_patched_endheaders(self, message_body=None):
"""Indicate that the last header line has been sent to the server.
This method sends the request to the server. The optional
message_body argument can be used to pass a message body
associated with the request. The message body will be sent in
the same packet as the message headers if it is string, otherwise it is
sent as a separate packet.
"""
if self._HTTPConnection__state == _CS_REQ_STARTED:
self._HTTPConnection__state = _CS_REQ_SENT
else:
raise CannotSendHeader()
self._send_output(message_body)
# TCP Maximum Segment Size (MSS) is determined by the TCP stack on
# a per-connection basis. There is no simple and efficient
# platform independent mechanism for determining the MSS, so
# instead a reasonable estimate is chosen. The getsockopt()
# interface using the TCP_MAXSEG parameter may be a suitable
# approach on some operating systems. A value of 16KiB is chosen
# as a reasonable estimate of the maximum MSS.
mss = 16384
def httpconnection_patched_send_output(self, message_body=None):
"""Send the currently buffered request and clear the buffer.
Appends an extra \\r\\n to the buffer.
A message_body may be specified, to be appended to the request.
"""
self._buffer.extend((b"", b""))
msg = b"\r\n".join(self._buffer)
del self._buffer[:]
msg = encode_to_s3(msg)
# If msg and message_body are sent in a single send() call,
# it will avoid performance problems caused by the interaction
# between delayed ack and the Nagle algorithm.
if isinstance(message_body, str) and len(message_body) < mss:
msg += message_body
message_body = None
self.send(msg)
if message_body is not None:
#message_body was not a string (i.e. it is a file) and
#we must run the risk of Nagle
self.send(message_body)
class ExpectationFailed(HTTPException):
pass
# Wrappers #
def httpconnection_patched_wrapper_send_body(self, message_body):
self.send(message_body)
httplib.HTTPResponse.begin = httpresponse_patched_begin
httplib.HTTPConnection.endheaders = httpconnection_patched_endheaders
httplib.HTTPConnection._send_output = httpconnection_patched_send_output
httplib.HTTPConnection._set_content_length = httpconnection_patched_set_content_length
httplib.HTTPConnection._send_request = httpconnection_patched_send_request
# Interfaces added to httplib.HTTPConnection:
httplib.HTTPConnection.wrapper_send_body = httpconnection_patched_wrapper_send_body