/usr/share/pyshared/cherrypy/_cpwsgiserver.py is in python-cherrypy 2.3.0-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import mimetools # todo: use email
import Queue
import re
quoted_slash = re.compile("(?i)%2F")
import rfc822
import socket
import sys
import threading
import time
import traceback
from urllib import unquote
from urlparse import urlparse
import errno
socket_errors_to_ignore = []
# Not all of these names will be defined for every platform.
for _ in ("EPIPE", "ETIMEDOUT", "ECONNREFUSED", "ECONNRESET",
"EHOSTDOWN", "EHOSTUNREACH",
"WSAECONNABORTED", "WSAECONNREFUSED", "WSAECONNRESET",
"WSAENETRESET", "WSAETIMEDOUT"):
if _ in dir(errno):
socket_errors_to_ignore.append(getattr(errno, _))
# de-dupe the list
socket_errors_to_ignore = dict.fromkeys(socket_errors_to_ignore).keys()
# These are lowercase because mimetools.Message uses lowercase keys.
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 HTTPRequest(object):
stderr = sys.stderr
bufsize = -1
def __init__(self, socket, addr, server):
self.socket = socket
self.addr = addr
self.server = server
self.environ = {}
self.ready = False
self.started_response = False
self.status = ""
self.outheaders = []
self.outheaderkeys = []
self.rfile = self.socket.makefile("r", self.bufsize)
self.wfile = self.socket.makefile("w", self.bufsize)
self.sent_headers = False
def parse_request(self):
self.sent_headers = False
self.environ = {}
self.environ["wsgi.version"] = (1,0)
self.environ["wsgi.url_scheme"] = "http"
self.environ["wsgi.input"] = self.rfile
self.environ["wsgi.errors"] = self.stderr
self.environ["wsgi.multithread"] = True
self.environ["wsgi.multiprocess"] = False
self.environ["wsgi.run_once"] = False
request_line = self.rfile.readline()
if not request_line:
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
method, path, req_protocol = request_line.strip().split(" ", 2)
self.environ["REQUEST_METHOD"] = method
# path may be an abs_path (including "http://host.domain.tld");
scheme, location, path, params, qs, frag = urlparse(path)
if scheme:
self.environ["wsgi.url_scheme"] = scheme
if params:
path = path + ";" + params
# 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)
for mount_point, wsgi_app in self.server.mount_points:
if path == "*":
# This means, of course, that the first wsgi_app will
# always handle a URI of "*".
self.environ["SCRIPT_NAME"] = ""
self.environ["PATH_INFO"] = "*"
self.wsgi_app = wsgi_app
break
# The mount_points list should be sorted by length, descending.
if path.startswith(mount_point):
self.environ["SCRIPT_NAME"] = mount_point
self.environ["PATH_INFO"] = path[len(mount_point):]
self.wsgi_app = wsgi_app
break
else:
self.abort("404 Not Found")
return
# Note that, like wsgiref and most other WSGI servers,
# we unquote the path but not the query string.
self.environ["QUERY_STRING"] = qs
self.environ["SERVER_PROTOCOL"] = req_protocol
# If the Request-URI was an absoluteURI, use its location atom.
self.environ["SERVER_NAME"] = location or self.server.server_name
if isinstance(self.server.bind_addr, basestring):
# AF_UNIX. This isn't really allowed by WSGI, which doesn't
# address unix domain sockets. But it's better than nothing.
self.environ["SERVER_PORT"] = ""
else:
self.environ["SERVER_PORT"] = str(self.server.bind_addr[1])
# optional values
# Until we do DNS lookups, don't include REMOTE_HOST
self.environ["REMOTE_ADDR"] = self.addr[0]
self.environ["REMOTE_PORT"] = str(self.addr[1])
# then all the http headers
headers = mimetools.Message(self.rfile)
self.environ["CONTENT_TYPE"] = headers.getheader("Content-type", "")
cl = headers.getheader("Content-length")
if method in ("POST", "PUT") and cl is None:
# No Content-Length header supplied. This will hang
# cgi.FieldStorage, since it cannot determine when to
# stop reading from the socket. Until we handle chunked
# encoding, always respond with 411 Length Required.
# See http://www.cherrypy.org/ticket/493.
self.abort("411 Length Required")
return
self.environ["CONTENT_LENGTH"] = cl or ""
for k in headers:
envname = "HTTP_" + k.upper().replace("-", "_")
if k in comma_separated_headers:
self.environ[envname] = ", ".join(headers.getheaders(k))
else:
self.environ[envname] = headers[k]
self.ready = True
def abort(self, status, msg=""):
"""Write a simple error message back to the client."""
proto = self.environ.get("SERVER_PROTOCOL", "HTTP/1.0")
self.wfile.write("%s %s\r\n" % (proto, status))
self.wfile.write("Content-Length: %s\r\n\r\n" % len(msg))
if msg:
self.wfile.write(msg)
self.wfile.flush()
self.ready = False
def start_response(self, status, headers, exc_info = None):
if self.started_response:
if not exc_info:
assert False, "Already started response"
else:
try:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
self.started_response = True
self.status = status
self.outheaders = headers
self.outheaderkeys = [key.lower() for (key,value) in self.outheaders]
return self.write
def write(self, d):
if not self.sent_headers:
self.sent_headers = True
self.send_headers()
self.wfile.write(d)
self.wfile.flush()
def send_headers(self):
if "content-length" not in self.outheaderkeys:
self.close_at_end = True
if "date" not in self.outheaderkeys:
self.outheaders.append(("Date", rfc822.formatdate()))
if "server" not in self.outheaderkeys:
self.outheaders.append(("Server", self.server.version))
if (self.environ["SERVER_PROTOCOL"] == "HTTP/1.1"
and "connection" not in self.outheaderkeys):
self.outheaders.append(("Connection", "close"))
self.wfile.write(self.environ["SERVER_PROTOCOL"] + " " + self.status + "\r\n")
for (k,v) in self.outheaders:
self.wfile.write(k + ": " + v + "\r\n")
self.wfile.write("\r\n")
self.wfile.flush()
def terminate(self):
if self.ready and not self.sent_headers and not self.server.interrupt:
self.sent_headers = True
self.send_headers()
self.rfile.close()
self.wfile.close()
self.socket.close()
_SHUTDOWNREQUEST = None
class WorkerThread(threading.Thread):
def __init__(self, server):
self.ready = False
self.server = server
threading.Thread.__init__(self)
def run(self):
try:
self.ready = True
while True:
request = self.server.requests.get()
if request is _SHUTDOWNREQUEST:
return
try:
try:
request.parse_request()
if request.ready:
response = request.wsgi_app(request.environ,
request.start_response)
try:
for line in response:
request.write(line)
finally:
if hasattr(response, "close"):
response.close()
except socket.error, e:
errno = e.args[0]
if errno not in socket_errors_to_ignore:
traceback.print_exc()
except (KeyboardInterrupt, SystemExit), exc:
self.server.interrupt = exc
except:
traceback.print_exc()
finally:
request.terminate()
except (KeyboardInterrupt, SystemExit), exc:
self.server.interrupt = exc
class CherryPyWSGIServer(object):
"""An HTTP server for WSGI.
bind_addr: a (host, port) tuple if TCP sockets are desired;
for UNIX sockets, supply the filename as a string.
wsgi_app: the WSGI 'application callable'; multiple WSGI applications
may be passed as (script_name, callable) pairs.
numthreads: the number of worker threads to create (default 10).
server_name: the string to set for WSGI's SERVER_NAME environ entry.
Defaults to socket.gethostname().
max: the maximum number of queued requests (defaults to -1 = no limit).
request_queue_size: the 'backlog' argument to socket.listen();
specifies the maximum number of queued connections (default 5).
timeout: the timeout in seconds for accepted connections (default 10).
"""
version = "CherryPy/2.3.0"
protocol = "HTTP/1.0"
ready = False
interrupt = None
RequestHandlerClass = HTTPRequest
def __init__(self, bind_addr, wsgi_app, numthreads=10, server_name=None,
max=-1, request_queue_size=5, timeout=10):
self.requests = Queue.Queue(max)
if callable(wsgi_app):
# We've been handed a single wsgi_app, in CP-2.1 style.
# Assume it's mounted at "".
self.mount_points = [("", wsgi_app)]
else:
# We've been handed a list of (mount_point, wsgi_app) tuples,
# so that the server can call different wsgi_apps, and also
# correctly set SCRIPT_NAME.
self.mount_points = wsgi_app
self.mount_points.sort()
self.mount_points.reverse()
self.bind_addr = bind_addr
self.numthreads = numthreads or 1
if not server_name:
server_name = socket.gethostname()
self.server_name = server_name
self.request_queue_size = request_queue_size
self._workerThreads = []
self.timeout = timeout
def start(self):
"""Run the server forever."""
# We don't have to trap KeyboardInterrupt or SystemExit here,
# because cherrpy.server already does so, calling self.stop() for us.
# If you're using this server with another framework, you should
# trap those exceptions in whatever code block calls start().
def bind(family, type, proto=0):
"""Create (or recreate) the actual socket object."""
self.socket = socket.socket(family, type, proto)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind(self.bind_addr)
# Select the appropriate socket
if isinstance(self.bind_addr, basestring):
# AF_UNIX socket
# So we can reuse the socket...
try: os.unlink(self.bind_addr)
except: pass
# So everyone can access the socket...
try: os.chmod(self.bind_addr, 0777)
except: pass
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind(self.bind_addr)
else:
# AF_INET or AF_INET6 socket
# Get the correct address family for our host (allows IPv6 addresses)
host, port = self.bind_addr
flags = 0
if host == '':
# Despite the socket module docs, using '' does not
# allow AI_PASSIVE to work. Passing None instead
# returns '0.0.0.0' like we want.
host = None
flags = socket.AI_PASSIVE
try:
info = socket.getaddrinfo(host, port, socket.AF_UNSPEC,
socket.SOCK_STREAM, 0, flags)
except socket.gaierror:
# Probably a DNS issue. Assume IPv4.
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind(self.bind_addr)
else:
self.socket = None
msg = "No socket could be created"
for res in info:
af, socktype, proto, canonname, sa = res
try:
self.socket = socket.socket(af, socktype, proto)
self.socket.setsockopt(socket.SOL_SOCKET,
socket.SO_REUSEADDR, 1)
self.socket.bind(self.bind_addr)
except socket.error, msg:
if self.socket:
self.socket.close()
self.socket = None
continue
break
if not self.socket:
raise socket.error, msg
# Timeout so KeyboardInterrupt can be caught on Win32
self.socket.settimeout(1)
self.socket.listen(self.request_queue_size)
# Create worker threads
for i in xrange(self.numthreads):
self._workerThreads.append(WorkerThread(self))
for worker in self._workerThreads:
worker.setName("CP WSGIServer " + worker.getName())
worker.start()
for worker in self._workerThreads:
while not worker.ready:
time.sleep(.1)
self.ready = True
while self.ready:
self.tick()
if self.interrupt:
raise self.interrupt
def tick(self):
try:
s, addr = self.socket.accept()
if not self.ready:
return
if hasattr(s, 'settimeout'):
s.settimeout(self.timeout)
request = self.RequestHandlerClass(s, addr, self)
self.requests.put(request)
except socket.timeout:
# The only reason for the timeout in start() is so we can
# notice keyboard interrupts on Win32, which don't interrupt
# accept() by default
return
except socket.error, x:
msg = x.args[1]
if msg == "Bad file descriptor":
# Our socket was closed
return
if msg == "Resource temporarily unavailable":
# Just try again. See http://www.cherrypy.org/ticket/479.
return
raise
def stop(self):
"""Gracefully shutdown a server that is serving forever."""
self.ready = False
s = getattr(self, "socket", None)
if s and hasattr(s, "close"):
s.close()
# Must shut down threads here so the code that calls
# this method can know when all threads are stopped.
for worker in self._workerThreads:
self.requests.put(_SHUTDOWNREQUEST)
# Don't join currentThread (when stop is called inside a request).
current = threading.currentThread()
while self._workerThreads:
worker = self._workerThreads.pop()
if worker is not current and worker.isAlive:
try:
worker.join()
except AssertionError:
pass
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