/
__init__.py
1794 lines (1553 loc) · 69.7 KB
/
__init__.py
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"""A high-speed, production ready, thread pooled, generic WSGI server.
Simplest example on how to use this module directly
(without using CherryPy's application machinery):
from cherrypy import wsgiserver
def my_crazy_app(environ, start_response):
status = '200 OK'
response_headers = [('Content-type','text/plain')]
start_response(status, response_headers)
return ['Hello world!\n']
server = wsgiserver.CherryPyWSGIServer(
('0.0.0.0', 8070), my_crazy_app,
server_name='www.cherrypy.example')
The CherryPy WSGI server can serve as many WSGI applications
as you want in one instance by using a WSGIPathInfoDispatcher:
d = WSGIPathInfoDispatcher({'/': my_crazy_app, '/blog': my_blog_app})
server = wsgiserver.CherryPyWSGIServer(('0.0.0.0', 80), d)
Want SSL support? Just set these attributes:
server.ssl_certificate = <filename>
server.ssl_private_key = <filename>
if __name__ == '__main__':
try:
server.start()
except KeyboardInterrupt:
server.stop()
This won't call the CherryPy engine (application side) at all, only the
WSGI server, which is independant from the rest of CherryPy. Don't
let the name "CherryPyWSGIServer" throw you; the name merely reflects
its origin, not its coupling.
For those of you wanting to understand internals of this module, here's the
basic call flow. The server's listening thread runs a very tight loop,
sticking incoming connections onto a Queue:
server = CherryPyWSGIServer(...)
server.start()
while True:
tick()
# This blocks until a request comes in:
child = socket.accept()
conn = HTTPConnection(child, ...)
server.requests.put(conn)
Worker threads are kept in a pool and poll the Queue, popping off and then
handling each connection in turn. Each connection can consist of an arbitrary
number of requests and their responses, so we run a nested loop:
while True:
conn = server.requests.get()
conn.communicate()
-> while True:
req = HTTPRequest(...)
req.parse_request()
-> # Read the Request-Line, e.g. "GET /page HTTP/1.1"
req.rfile.readline()
req.read_headers()
req.respond()
-> response = wsgi_app(...)
try:
for chunk in response:
if chunk:
req.write(chunk)
finally:
if hasattr(response, "close"):
response.close()
if req.close_connection:
return
"""
import base64
import os
import Queue
import re
quoted_slash = re.compile("(?i)%2F")
import rfc822
import socket
try:
import cStringIO as StringIO
except ImportError:
import StringIO
_fileobject_uses_str_type = isinstance(socket._fileobject(None)._rbuf, basestring)
import sys
import threading
import time
import traceback
from urllib import unquote
from urlparse import urlparse
import warnings
try:
from OpenSSL import SSL
from OpenSSL import crypto
except ImportError:
SSL = None
import errno
def plat_specific_errors(*errnames):
"""Return error numbers for all errors in errnames on this platform.
The 'errno' module contains different global constants depending on
the specific platform (OS). This function will return the list of
numeric values for a given list of potential names.
"""
errno_names = dir(errno)
nums = [getattr(errno, k) for k in errnames if k in errno_names]
# de-dupe the list
return dict.fromkeys(nums).keys()
socket_error_eintr = plat_specific_errors("EINTR", "WSAEINTR")
socket_errors_to_ignore = plat_specific_errors(
"EPIPE",
"EBADF", "WSAEBADF",
"ENOTSOCK", "WSAENOTSOCK",
"ETIMEDOUT", "WSAETIMEDOUT",
"ECONNREFUSED", "WSAECONNREFUSED",
"ECONNRESET", "WSAECONNRESET",
"ECONNABORTED", "WSAECONNABORTED",
"ENETRESET", "WSAENETRESET",
"EHOSTDOWN", "EHOSTUNREACH",
)
socket_errors_to_ignore.append("timed out")
socket_errors_nonblocking = plat_specific_errors(
'EAGAIN', 'EWOULDBLOCK', 'WSAEWOULDBLOCK')
comma_separated_headers = ['ACCEPT', 'ACCEPT-CHARSET', 'ACCEPT-ENCODING',
'ACCEPT-LANGUAGE', 'ACCEPT-RANGES', 'ALLOW', 'CACHE-CONTROL',
'CONNECTION', 'CONTENT-ENCODING', 'CONTENT-LANGUAGE', 'EXPECT',
'IF-MATCH', 'IF-NONE-MATCH', 'PRAGMA', 'PROXY-AUTHENTICATE', 'TE',
'TRAILER', 'TRANSFER-ENCODING', 'UPGRADE', 'VARY', 'VIA', 'WARNING',
'WWW-AUTHENTICATE']
class WSGIPathInfoDispatcher(object):
"""A WSGI dispatcher for dispatch based on the PATH_INFO.
apps: a dict or list of (path_prefix, app) pairs.
"""
def __init__(self, apps):
try:
apps = apps.items()
except AttributeError:
pass
# Sort the apps by len(path), descending
apps.sort()
apps.reverse()
# The path_prefix strings must start, but not end, with a slash.
# Use "" instead of "/".
self.apps = [(p.rstrip("/"), a) for p, a in apps]
def __call__(self, environ, start_response):
path = environ["PATH_INFO"] or "/"
for p, app in self.apps:
# The apps list should be sorted by length, descending.
if path.startswith(p + "/") or path == p:
environ = environ.copy()
environ["SCRIPT_NAME"] = environ["SCRIPT_NAME"] + p
environ["PATH_INFO"] = path[len(p):]
return app(environ, start_response)
start_response('404 Not Found', [('Content-Type', 'text/plain'),
('Content-Length', '0')])
return ['']
class MaxSizeExceeded(Exception):
pass
class SizeCheckWrapper(object):
"""Wraps a file-like object, raising MaxSizeExceeded if too large."""
def __init__(self, rfile, maxlen):
self.rfile = rfile
self.maxlen = maxlen
self.bytes_read = 0
def _check_length(self):
if self.maxlen and self.bytes_read > self.maxlen:
raise MaxSizeExceeded()
def read(self, size=None):
data = self.rfile.read(size)
self.bytes_read += len(data)
self._check_length()
return data
def readline(self, size=None):
if size is not None:
data = self.rfile.readline(size)
self.bytes_read += len(data)
self._check_length()
return data
# User didn't specify a size ...
# We read the line in chunks to make sure it's not a 100MB line !
res = []
while True:
data = self.rfile.readline(256)
self.bytes_read += len(data)
self._check_length()
res.append(data)
# See http://www.cherrypy.org/ticket/421
if len(data) < 256 or data[-1:] == "\n":
return ''.join(res)
def readlines(self, sizehint=0):
# Shamelessly stolen from StringIO
total = 0
lines = []
line = self.readline()
while line:
lines.append(line)
total += len(line)
if 0 < sizehint <= total:
break
line = self.readline()
return lines
def close(self):
self.rfile.close()
def __iter__(self):
return self
def next(self):
data = self.rfile.next()
self.bytes_read += len(data)
self._check_length()
return data
class HTTPRequest(object):
"""An HTTP Request (and response).
A single HTTP connection may consist of multiple request/response pairs.
send: the 'send' method from the connection's socket object.
wsgi_app: the WSGI application to call.
environ: a partial WSGI environ (server and connection entries).
The caller MUST set the following entries:
* All wsgi.* entries, including .input
* SERVER_NAME and SERVER_PORT
* Any SSL_* entries
* Any custom entries like REMOTE_ADDR and REMOTE_PORT
* SERVER_SOFTWARE: the value to write in the "Server" response header.
* ACTUAL_SERVER_PROTOCOL: the value to write in the Status-Line of
the response. From RFC 2145: "An HTTP server SHOULD send a
response version equal to the highest version for which the
server is at least conditionally compliant, and whose major
version is less than or equal to the one received in the
request. An HTTP server MUST NOT send a version for which
it is not at least conditionally compliant."
outheaders: a list of header tuples to write in the response.
ready: when True, the request has been parsed and is ready to begin
generating the response. When False, signals the calling Connection
that the response should not be generated and the connection should
close.
close_connection: signals the calling Connection that the request
should close. This does not imply an error! The client and/or
server may each request that the connection be closed.
chunked_write: if True, output will be encoded with the "chunked"
transfer-coding. This value is set automatically inside
send_headers.
"""
max_request_header_size = 0
max_request_body_size = 0
def __init__(self, wfile, environ, wsgi_app):
self.rfile = environ['wsgi.input']
self.wfile = wfile
self.environ = environ.copy()
self.wsgi_app = wsgi_app
self.ready = False
self.started_response = False
self.status = ""
self.outheaders = []
self.sent_headers = False
self.close_connection = False
self.chunked_write = False
def parse_request(self):
"""Parse the next HTTP request start-line and message-headers."""
self.rfile.maxlen = self.max_request_header_size
self.rfile.bytes_read = 0
try:
self._parse_request()
except MaxSizeExceeded:
self.simple_response("413 Request Entity Too Large")
return
def _parse_request(self):
# HTTP/1.1 connections are persistent by default. If a client
# requests a page, then idles (leaves the connection open),
# then rfile.readline() will raise socket.error("timed out").
# Note that it does this based on the value given to settimeout(),
# and doesn't need the client to request or acknowledge the close
# (although your TCP stack might suffer for it: cf Apache's history
# with FIN_WAIT_2).
request_line = self.rfile.readline()
if not request_line:
# Force self.ready = False so the connection will close.
self.ready = False
return
if request_line == "\r\n":
# RFC 2616 sec 4.1: "...if the server is reading the protocol
# stream at the beginning of a message and receives a CRLF
# first, it should ignore the CRLF."
# But only ignore one leading line! else we enable a DoS.
request_line = self.rfile.readline()
if not request_line:
self.ready = False
return
environ = self.environ
try:
method, path, req_protocol = request_line.strip().split(" ", 2)
except ValueError:
self.simple_response(400, "Malformed Request-Line")
return
environ["REQUEST_METHOD"] = method
# path may be an abs_path (including "http://host.domain.tld");
scheme, location, path, params, qs, frag = urlparse(path)
if frag:
self.simple_response("400 Bad Request",
"Illegal #fragment in Request-URI.")
return
if scheme:
environ["wsgi.url_scheme"] = scheme
if params:
path = path + ";" + params
environ["SCRIPT_NAME"] = ""
# Unquote the path+params (e.g. "/this%20path" -> "this path").
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2
#
# But note that "...a URI must be separated into its components
# before the escaped characters within those components can be
# safely decoded." http://www.ietf.org/rfc/rfc2396.txt, sec 2.4.2
atoms = [unquote(x) for x in quoted_slash.split(path)]
path = "%2F".join(atoms)
environ["PATH_INFO"] = path
# Note that, like wsgiref and most other WSGI servers,
# we unquote the path but not the query string.
environ["QUERY_STRING"] = qs
# Compare request and server HTTP protocol versions, in case our
# server does not support the requested protocol. Limit our output
# to min(req, server). We want the following output:
# request server actual written supported response
# protocol protocol response protocol feature set
# a 1.0 1.0 1.0 1.0
# b 1.0 1.1 1.1 1.0
# c 1.1 1.0 1.0 1.0
# d 1.1 1.1 1.1 1.1
# Notice that, in (b), the response will be "HTTP/1.1" even though
# the client only understands 1.0. RFC 2616 10.5.6 says we should
# only return 505 if the _major_ version is different.
rp = int(req_protocol[5]), int(req_protocol[7])
server_protocol = environ["ACTUAL_SERVER_PROTOCOL"]
sp = int(server_protocol[5]), int(server_protocol[7])
if sp[0] != rp[0]:
self.simple_response("505 HTTP Version Not Supported")
return
# Bah. "SERVER_PROTOCOL" is actually the REQUEST protocol.
environ["SERVER_PROTOCOL"] = req_protocol
self.response_protocol = "HTTP/%s.%s" % min(rp, sp)
# If the Request-URI was an absoluteURI, use its location atom.
if location:
environ["SERVER_NAME"] = location
# then all the http headers
try:
self.read_headers()
except ValueError, ex:
self.simple_response("400 Bad Request", repr(ex.args))
return
mrbs = self.max_request_body_size
if mrbs and int(environ.get("CONTENT_LENGTH", 0)) > mrbs:
self.simple_response("413 Request Entity Too Large")
return
# Persistent connection support
if self.response_protocol == "HTTP/1.1":
# Both server and client are HTTP/1.1
if environ.get("HTTP_CONNECTION", "") == "close":
self.close_connection = True
else:
# Either the server or client (or both) are HTTP/1.0
if environ.get("HTTP_CONNECTION", "") != "Keep-Alive":
self.close_connection = True
# Transfer-Encoding support
te = None
if self.response_protocol == "HTTP/1.1":
te = environ.get("HTTP_TRANSFER_ENCODING")
if te:
te = [x.strip().lower() for x in te.split(",") if x.strip()]
self.chunked_read = False
if te:
for enc in te:
if enc == "chunked":
self.chunked_read = True
else:
# Note that, even if we see "chunked", we must reject
# if there is an extension we don't recognize.
self.simple_response("501 Unimplemented")
self.close_connection = True
return
# From PEP 333:
# "Servers and gateways that implement HTTP 1.1 must provide
# transparent support for HTTP 1.1's "expect/continue" mechanism.
# This may be done in any of several ways:
# 1. Respond to requests containing an Expect: 100-continue request
# with an immediate "100 Continue" response, and proceed normally.
# 2. Proceed with the request normally, but provide the application
# with a wsgi.input stream that will send the "100 Continue"
# response if/when the application first attempts to read from
# the input stream. The read request must then remain blocked
# until the client responds.
# 3. Wait until the client decides that the server does not support
# expect/continue, and sends the request body on its own.
# (This is suboptimal, and is not recommended.)
#
# We used to do 3, but are now doing 1. Maybe we'll do 2 someday,
# but it seems like it would be a big slowdown for such a rare case.
if environ.get("HTTP_EXPECT", "") == "100-continue":
self.simple_response(100)
self.ready = True
def read_headers(self):
"""Read header lines from the incoming stream."""
environ = self.environ
while True:
line = self.rfile.readline()
if not line:
# No more data--illegal end of headers
raise ValueError("Illegal end of headers.")
if line == '\r\n':
# Normal end of headers
break
if line[0] in ' \t':
# It's a continuation line.
v = line.strip()
else:
k, v = line.split(":", 1)
k, v = k.strip().upper(), v.strip()
envname = "HTTP_" + k.replace("-", "_")
if k in comma_separated_headers:
existing = environ.get(envname)
if existing:
v = ", ".join((existing, v))
environ[envname] = v
ct = environ.pop("HTTP_CONTENT_TYPE", None)
if ct is not None:
environ["CONTENT_TYPE"] = ct
cl = environ.pop("HTTP_CONTENT_LENGTH", None)
if cl is not None:
environ["CONTENT_LENGTH"] = cl
def decode_chunked(self):
"""Decode the 'chunked' transfer coding."""
cl = 0
data = StringIO.StringIO()
while True:
line = self.rfile.readline().strip().split(";", 1)
chunk_size = int(line.pop(0), 16)
if chunk_size <= 0:
break
## if line: chunk_extension = line[0]
cl += chunk_size
data.write(self.rfile.read(chunk_size))
crlf = self.rfile.read(2)
if crlf != "\r\n":
self.simple_response("400 Bad Request",
"Bad chunked transfer coding "
"(expected '\\r\\n', got %r)" % crlf)
return
# Grab any trailer headers
self.read_headers()
data.seek(0)
self.environ["wsgi.input"] = data
self.environ["CONTENT_LENGTH"] = str(cl) or ""
return True
def respond(self):
"""Call the appropriate WSGI app and write its iterable output."""
# Set rfile.maxlen to ensure we don't read past Content-Length.
# This will also be used to read the entire request body if errors
# are raised before the app can read the body.
if self.chunked_read:
# If chunked, Content-Length will be 0.
self.rfile.maxlen = self.max_request_body_size
else:
cl = int(self.environ.get("CONTENT_LENGTH", 0))
if self.max_request_body_size:
self.rfile.maxlen = min(cl, self.max_request_body_size)
else:
self.rfile.maxlen = cl
self.rfile.bytes_read = 0
try:
self._respond()
except MaxSizeExceeded:
if not self.sent_headers:
self.simple_response("413 Request Entity Too Large")
return
def _respond(self):
if self.chunked_read:
if not self.decode_chunked():
self.close_connection = True
return
response = self.wsgi_app(self.environ, self.start_response)
try:
for chunk in response:
# "The start_response callable must not actually transmit
# the response headers. Instead, it must store them for the
# server or gateway to transmit only after the first
# iteration of the application return value that yields
# a NON-EMPTY string, or upon the application's first
# invocation of the write() callable." (PEP 333)
if chunk:
self.write(chunk)
finally:
if hasattr(response, "close"):
response.close()
if (self.ready and not self.sent_headers):
self.sent_headers = True
self.send_headers()
if self.chunked_write:
self.wfile.sendall("0\r\n\r\n")
def simple_response(self, status, msg=""):
"""Write a simple response back to the client."""
status = str(status)
buf = ["%s %s\r\n" % (self.environ['ACTUAL_SERVER_PROTOCOL'], status),
"Content-Length: %s\r\n" % len(msg),
"Content-Type: text/plain\r\n"]
if status[:3] == "413" and self.response_protocol == 'HTTP/1.1':
# Request Entity Too Large
self.close_connection = True
buf.append("Connection: close\r\n")
buf.append("\r\n")
if msg:
buf.append(msg)
try:
self.wfile.sendall("".join(buf))
except socket.error, x:
if x.args[0] not in socket_errors_to_ignore:
raise
def start_response(self, status, headers, exc_info = None):
"""WSGI callable to begin the HTTP response."""
# "The application may call start_response more than once,
# if and only if the exc_info argument is provided."
if self.started_response and not exc_info:
raise AssertionError("WSGI start_response called a second "
"time with no exc_info.")
# "if exc_info is provided, and the HTTP headers have already been
# sent, start_response must raise an error, and should raise the
# exc_info tuple."
if self.sent_headers:
try:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
self.started_response = True
self.status = status
self.outheaders.extend(headers)
return self.write
def write(self, chunk):
"""WSGI callable to write unbuffered data to the client.
This method is also used internally by start_response (to write
data from the iterable returned by the WSGI application).
"""
if not self.started_response:
raise AssertionError("WSGI write called before start_response.")
if not self.sent_headers:
self.sent_headers = True
self.send_headers()
if self.chunked_write and chunk:
buf = [hex(len(chunk))[2:], "\r\n", chunk, "\r\n"]
self.wfile.sendall("".join(buf))
else:
self.wfile.sendall(chunk)
def send_headers(self):
"""Assert, process, and send the HTTP response message-headers."""
hkeys = [key.lower() for key, value in self.outheaders]
status = int(self.status[:3])
if status == 413:
# Request Entity Too Large. Close conn to avoid garbage.
self.close_connection = True
elif "content-length" not in hkeys:
# "All 1xx (informational), 204 (no content),
# and 304 (not modified) responses MUST NOT
# include a message-body." So no point chunking.
if status < 200 or status in (204, 205, 304):
pass
else:
if (self.response_protocol == 'HTTP/1.1'
and self.environ["REQUEST_METHOD"] != 'HEAD'):
# Use the chunked transfer-coding
self.chunked_write = True
self.outheaders.append(("Transfer-Encoding", "chunked"))
else:
# Closing the conn is the only way to determine len.
self.close_connection = True
if "connection" not in hkeys:
if self.response_protocol == 'HTTP/1.1':
# Both server and client are HTTP/1.1 or better
if self.close_connection:
self.outheaders.append(("Connection", "close"))
else:
# Server and/or client are HTTP/1.0
if not self.close_connection:
self.outheaders.append(("Connection", "Keep-Alive"))
if (not self.close_connection) and (not self.chunked_read):
# Read any remaining request body data on the socket.
# "If an origin server receives a request that does not include an
# Expect request-header field with the "100-continue" expectation,
# the request includes a request body, and the server responds
# with a final status code before reading the entire request body
# from the transport connection, then the server SHOULD NOT close
# the transport connection until it has read the entire request,
# or until the client closes the connection. Otherwise, the client
# might not reliably receive the response message. However, this
# requirement is not be construed as preventing a server from
# defending itself against denial-of-service attacks, or from
# badly broken client implementations."
size = self.rfile.maxlen - self.rfile.bytes_read
if size > 0:
self.rfile.read(size)
if "date" not in hkeys:
self.outheaders.append(("Date", rfc822.formatdate()))
if "server" not in hkeys:
self.outheaders.append(("Server", self.environ['SERVER_SOFTWARE']))
buf = [self.environ['ACTUAL_SERVER_PROTOCOL'], " ", self.status, "\r\n"]
try:
buf += [k + ": " + v + "\r\n" for k, v in self.outheaders]
except TypeError:
if not isinstance(k, str):
raise TypeError("WSGI response header key %r is not a string.")
if not isinstance(v, str):
raise TypeError("WSGI response header value %r is not a string.")
else:
raise
buf.append("\r\n")
self.wfile.sendall("".join(buf))
class NoSSLError(Exception):
"""Exception raised when a client speaks HTTP to an HTTPS socket."""
pass
class FatalSSLAlert(Exception):
"""Exception raised when the SSL implementation signals a fatal alert."""
pass
if not _fileobject_uses_str_type:
class CP_fileobject(socket._fileobject):
"""Faux file object attached to a socket object."""
def sendall(self, data):
"""Sendall for non-blocking sockets."""
while data:
try:
bytes_sent = self.send(data)
data = data[bytes_sent:]
except socket.error, e:
if e.args[0] not in socket_errors_nonblocking:
raise
def send(self, data):
return self._sock.send(data)
def flush(self):
if self._wbuf:
buffer = "".join(self._wbuf)
self._wbuf = []
self.sendall(buffer)
def recv(self, size):
while True:
try:
return self._sock.recv(size)
except socket.error, e:
if (e.args[0] not in socket_errors_nonblocking
and e.args[0] not in socket_error_eintr):
raise
def read(self, size=-1):
# Use max, disallow tiny reads in a loop as they are very inefficient.
# We never leave read() with any leftover data from a new recv() call
# in our internal buffer.
rbufsize = max(self._rbufsize, self.default_bufsize)
# Our use of StringIO rather than lists of string objects returned by
# recv() minimizes memory usage and fragmentation that occurs when
# rbufsize is large compared to the typical return value of recv().
buf = self._rbuf
buf.seek(0, 2) # seek end
if size < 0:
# Read until EOF
self._rbuf = StringIO.StringIO() # reset _rbuf. we consume it via buf.
while True:
data = self.recv(rbufsize)
if not data:
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or EOF seen, whichever comes first
buf_len = buf.tell()
if buf_len >= size:
# Already have size bytes in our buffer? Extract and return.
buf.seek(0)
rv = buf.read(size)
self._rbuf = StringIO.StringIO()
self._rbuf.write(buf.read())
return rv
self._rbuf = StringIO.StringIO() # reset _rbuf. we consume it via buf.
while True:
left = size - buf_len
# recv() will malloc the amount of memory given as its
# parameter even though it often returns much less data
# than that. The returned data string is short lived
# as we copy it into a StringIO and free it. This avoids
# fragmentation issues on many platforms.
data = self.recv(left)
if not data:
break
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid buffer data copies when:
# - We have no data in our buffer.
# AND
# - Our call to recv returned exactly the
# number of bytes we were asked to read.
return data
if n == left:
buf.write(data)
del data # explicit free
break
assert n <= left, "recv(%d) returned %d bytes" % (left, n)
buf.write(data)
buf_len += n
del data # explicit free
#assert buf_len == buf.tell()
return buf.getvalue()
def readline(self, size=-1):
buf = self._rbuf
buf.seek(0, 2) # seek end
if buf.tell() > 0:
# check if we already have it in our buffer
buf.seek(0)
bline = buf.readline(size)
if bline.endswith('\n') or len(bline) == size:
self._rbuf = StringIO.StringIO()
self._rbuf.write(buf.read())
return bline
del bline
if size < 0:
# Read until \n or EOF, whichever comes first
if self._rbufsize <= 1:
# Speed up unbuffered case
buf.seek(0)
buffers = [buf.read()]
self._rbuf = StringIO.StringIO() # reset _rbuf. we consume it via buf.
data = None
recv = self.recv
while data != "\n":
data = recv(1)
if not data:
break
buffers.append(data)
return "".join(buffers)
buf.seek(0, 2) # seek end
self._rbuf = StringIO.StringIO() # reset _rbuf. we consume it via buf.
while True:
data = self.recv(self._rbufsize)
if not data:
break
nl = data.find('\n')
if nl >= 0:
nl += 1
buf.write(data[:nl])
self._rbuf.write(data[nl:])
del data
break
buf.write(data)
return buf.getvalue()
else:
# Read until size bytes or \n or EOF seen, whichever comes first
buf.seek(0, 2) # seek end
buf_len = buf.tell()
if buf_len >= size:
buf.seek(0)
rv = buf.read(size)
self._rbuf = StringIO.StringIO()
self._rbuf.write(buf.read())
return rv
self._rbuf = StringIO.StringIO() # reset _rbuf. we consume it via buf.
while True:
data = self.recv(self._rbufsize)
if not data:
break
left = size - buf_len
# did we just receive a newline?
nl = data.find('\n', 0, left)
if nl >= 0:
nl += 1
# save the excess data to _rbuf
self._rbuf.write(data[nl:])
if buf_len:
buf.write(data[:nl])
break
else:
# Shortcut. Avoid data copy through buf when returning
# a substring of our first recv().
return data[:nl]
n = len(data)
if n == size and not buf_len:
# Shortcut. Avoid data copy through buf when
# returning exactly all of our first recv().
return data
if n >= left:
buf.write(data[:left])
self._rbuf.write(data[left:])
break
buf.write(data)
buf_len += n
#assert buf_len == buf.tell()
return buf.getvalue()
else:
class CP_fileobject(socket._fileobject):
"""Faux file object attached to a socket object."""
def sendall(self, data):
"""Sendall for non-blocking sockets."""
while data:
try:
bytes_sent = self.send(data)
data = data[bytes_sent:]
except socket.error, e:
if e.args[0] not in socket_errors_nonblocking:
raise
def send(self, data):
return self._sock.send(data)
def flush(self):
if self._wbuf:
buffer = "".join(self._wbuf)
self._wbuf = []
self.sendall(buffer)
def recv(self, size):
while True:
try:
return self._sock.recv(size)
except socket.error, e:
if (e.args[0] not in socket_errors_nonblocking
and e.args[0] not in socket_error_eintr):
raise
def read(self, size=-1):
if size < 0:
# Read until EOF
buffers = [self._rbuf]
self._rbuf = ""
if self._rbufsize <= 1:
recv_size = self.default_bufsize
else:
recv_size = self._rbufsize
while True:
data = self.recv(recv_size)
if not data:
break
buffers.append(data)
return "".join(buffers)
else:
# Read until size bytes or EOF seen, whichever comes first
data = self._rbuf
buf_len = len(data)
if buf_len >= size:
self._rbuf = data[size:]
return data[:size]
buffers = []
if data:
buffers.append(data)
self._rbuf = ""
while True:
left = size - buf_len
recv_size = max(self._rbufsize, left)
data = self.recv(recv_size)
if not data:
break
buffers.append(data)
n = len(data)
if n >= left:
self._rbuf = data[left:]
buffers[-1] = data[:left]
break
buf_len += n
return "".join(buffers)
def readline(self, size=-1):
data = self._rbuf
if size < 0:
# Read until \n or EOF, whichever comes first
if self._rbufsize <= 1:
# Speed up unbuffered case
assert data == ""
buffers = []
while data != "\n":
data = self.recv(1)
if not data:
break
buffers.append(data)
return "".join(buffers)
nl = data.find('\n')
if nl >= 0:
nl += 1
self._rbuf = data[nl:]
return data[:nl]
buffers = []
if data:
buffers.append(data)
self._rbuf = ""
while True:
data = self.recv(self._rbufsize)
if not data:
break
buffers.append(data)