378efb6ef3
This keeps the default intact (8192 is the max request line length) but allows the WSGI Server users to override it.
681 lines
26 KiB
Python
681 lines
26 KiB
Python
import errno
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import os
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import sys
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import time
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import traceback
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import warnings
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from eventlet.green import urllib
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from eventlet.green import socket
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from eventlet.green import BaseHTTPServer
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from eventlet import greenpool
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from eventlet import greenio
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from eventlet.support import get_errno
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DEFAULT_MAX_SIMULTANEOUS_REQUESTS = 1024
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DEFAULT_MAX_HTTP_VERSION = 'HTTP/1.1'
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MAX_REQUEST_LINE = 8192
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MAX_HEADER_LINE = 8192
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MAX_TOTAL_HEADER_SIZE = 65536
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MINIMUM_CHUNK_SIZE = 4096
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DEFAULT_LOG_FORMAT= ('%(client_ip)s - - [%(date_time)s] "%(request_line)s"'
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' %(status_code)s %(body_length)s %(wall_seconds).6f')
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__all__ = ['server', 'format_date_time']
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# Weekday and month names for HTTP date/time formatting; always English!
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_weekdayname = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
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_monthname = [None, # Dummy so we can use 1-based month numbers
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
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def format_date_time(timestamp):
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"""Formats a unix timestamp into an HTTP standard string."""
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year, month, day, hh, mm, ss, wd, _y, _z = time.gmtime(timestamp)
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return "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (
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_weekdayname[wd], day, _monthname[month], year, hh, mm, ss
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)
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# Collections of error codes to compare against. Not all attributes are set
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# on errno module on all platforms, so some are literals :(
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BAD_SOCK = set((errno.EBADF, 10053))
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BROKEN_SOCK = set((errno.EPIPE, errno.ECONNRESET))
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# special flag return value for apps
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class _AlreadyHandled(object):
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def __iter__(self):
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return self
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def next(self):
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raise StopIteration
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ALREADY_HANDLED = _AlreadyHandled()
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class Input(object):
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def __init__(self,
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rfile,
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content_length,
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wfile=None,
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wfile_line=None,
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chunked_input=False):
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self.rfile = rfile
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if content_length is not None:
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content_length = int(content_length)
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self.content_length = content_length
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self.wfile = wfile
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self.wfile_line = wfile_line
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self.position = 0
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self.chunked_input = chunked_input
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self.chunk_length = -1
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def _do_read(self, reader, length=None):
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if self.wfile is not None:
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## 100 Continue
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self.wfile.write(self.wfile_line)
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self.wfile = None
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self.wfile_line = None
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if length is None and self.content_length is not None:
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length = self.content_length - self.position
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if length and length > self.content_length - self.position:
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length = self.content_length - self.position
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if not length:
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return ''
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try:
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read = reader(length)
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except greenio.SSL.ZeroReturnError:
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read = ''
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self.position += len(read)
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return read
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def _chunked_read(self, rfile, length=None, use_readline=False):
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if self.wfile is not None:
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## 100 Continue
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self.wfile.write(self.wfile_line)
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self.wfile = None
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self.wfile_line = None
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try:
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if length == 0:
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return ""
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if length < 0:
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length = None
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if use_readline:
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reader = self.rfile.readline
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else:
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reader = self.rfile.read
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response = []
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while self.chunk_length != 0:
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maxreadlen = self.chunk_length - self.position
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if length is not None and length < maxreadlen:
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maxreadlen = length
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if maxreadlen > 0:
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data = reader(maxreadlen)
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if not data:
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self.chunk_length = 0
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raise IOError("unexpected end of file while parsing chunked data")
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datalen = len(data)
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response.append(data)
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self.position += datalen
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if self.chunk_length == self.position:
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rfile.readline()
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if length is not None:
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length -= datalen
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if length == 0:
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break
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if use_readline and data[-1] == "\n":
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break
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else:
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self.chunk_length = int(rfile.readline().split(";", 1)[0], 16)
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self.position = 0
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if self.chunk_length == 0:
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rfile.readline()
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except greenio.SSL.ZeroReturnError:
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pass
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return ''.join(response)
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def read(self, length=None):
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if self.chunked_input:
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return self._chunked_read(self.rfile, length)
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return self._do_read(self.rfile.read, length)
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def readline(self, size=None):
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if self.chunked_input:
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return self._chunked_read(self.rfile, size, True)
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else:
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return self._do_read(self.rfile.readline, size)
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def readlines(self, hint=None):
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return self._do_read(self.rfile.readlines, hint)
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def __iter__(self):
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return iter(self.read())
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def get_socket(self):
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return self.rfile._sock
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class HeaderLineTooLong(Exception):
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pass
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class HeadersTooLarge(Exception):
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pass
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class FileObjectForHeaders(object):
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def __init__(self, fp):
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self.fp = fp
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self.total_header_size = 0
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def readline(self, size=-1):
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sz = size
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if size < 0:
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sz = MAX_HEADER_LINE
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rv = self.fp.readline(sz)
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if size < 0 and len(rv) >= MAX_HEADER_LINE:
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raise HeaderLineTooLong()
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self.total_header_size += len(rv)
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if self.total_header_size > MAX_TOTAL_HEADER_SIZE:
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raise HeadersTooLarge()
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return rv
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class HttpProtocol(BaseHTTPServer.BaseHTTPRequestHandler):
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protocol_version = 'HTTP/1.1'
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minimum_chunk_size = MINIMUM_CHUNK_SIZE
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def setup(self):
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# overriding SocketServer.setup to correctly handle SSL.Connection objects
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conn = self.connection = self.request
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try:
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self.rfile = conn.makefile('rb', self.rbufsize)
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self.wfile = conn.makefile('wb', self.wbufsize)
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except (AttributeError, NotImplementedError):
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if hasattr(conn, 'send') and hasattr(conn, 'recv'):
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# it's an SSL.Connection
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self.rfile = socket._fileobject(conn, "rb", self.rbufsize)
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self.wfile = socket._fileobject(conn, "wb", self.wbufsize)
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else:
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# it's a SSLObject, or a martian
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raise NotImplementedError("wsgi.py doesn't support sockets "\
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"of type %s" % type(conn))
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def handle_one_request(self):
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if self.server.max_http_version:
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self.protocol_version = self.server.max_http_version
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if self.rfile.closed:
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self.close_connection = 1
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return
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try:
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self.raw_requestline = self.rfile.readline(self.server.url_length_limit)
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if len(self.raw_requestline) == self.server.url_length_limit:
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self.wfile.write(
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"HTTP/1.0 414 Request URI Too Long\r\n"
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"Connection: close\r\nContent-length: 0\r\n\r\n")
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self.close_connection = 1
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return
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except greenio.SSL.ZeroReturnError:
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self.raw_requestline = ''
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except socket.error, e:
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if get_errno(e) not in BAD_SOCK:
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raise
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self.raw_requestline = ''
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if not self.raw_requestline:
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self.close_connection = 1
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return
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orig_rfile = self.rfile
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try:
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self.rfile = FileObjectForHeaders(self.rfile)
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if not self.parse_request():
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return
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except HeaderLineTooLong:
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self.wfile.write(
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"HTTP/1.0 400 Header Line Too Long\r\n"
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"Connection: close\r\nContent-length: 0\r\n\r\n")
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self.close_connection = 1
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return
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except HeadersTooLarge:
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self.wfile.write(
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"HTTP/1.0 400 Headers Too Large\r\n"
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"Connection: close\r\nContent-length: 0\r\n\r\n")
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self.close_connection = 1
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return
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finally:
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self.rfile = orig_rfile
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content_length = self.headers.getheader('content-length')
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if content_length:
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try:
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int(content_length)
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except ValueError:
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self.wfile.write(
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"HTTP/1.0 400 Bad Request\r\n"
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"Connection: close\r\nContent-length: 0\r\n\r\n")
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self.close_connection = 1
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return
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self.environ = self.get_environ()
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self.application = self.server.app
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try:
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self.server.outstanding_requests += 1
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try:
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self.handle_one_response()
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except socket.error, e:
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# Broken pipe, connection reset by peer
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if get_errno(e) not in BROKEN_SOCK:
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raise
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finally:
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self.server.outstanding_requests -= 1
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def handle_one_response(self):
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start = time.time()
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headers_set = []
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headers_sent = []
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wfile = self.wfile
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result = None
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use_chunked = [False]
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length = [0]
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status_code = [200]
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def write(data, _writelines=wfile.writelines):
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towrite = []
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if not headers_set:
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raise AssertionError("write() before start_response()")
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elif not headers_sent:
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status, response_headers = headers_set
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headers_sent.append(1)
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header_list = [header[0].lower() for header in response_headers]
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towrite.append('%s %s\r\n' % (self.protocol_version, status))
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for header in response_headers:
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towrite.append('%s: %s\r\n' % header)
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# send Date header?
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if 'date' not in header_list:
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towrite.append('Date: %s\r\n' % (format_date_time(time.time()),))
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client_conn = self.headers.get('Connection', '').lower()
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send_keep_alive = False
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if self.close_connection == 0 and \
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self.server.keepalive and (client_conn == 'keep-alive' or \
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(self.request_version == 'HTTP/1.1' and
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not client_conn == 'close')):
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# only send keep-alives back to clients that sent them,
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# it's redundant for 1.1 connections
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send_keep_alive = (client_conn == 'keep-alive')
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self.close_connection = 0
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else:
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self.close_connection = 1
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if 'content-length' not in header_list:
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if self.request_version == 'HTTP/1.1':
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use_chunked[0] = True
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towrite.append('Transfer-Encoding: chunked\r\n')
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elif 'content-length' not in header_list:
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# client is 1.0 and therefore must read to EOF
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self.close_connection = 1
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if self.close_connection:
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towrite.append('Connection: close\r\n')
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elif send_keep_alive:
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towrite.append('Connection: keep-alive\r\n')
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towrite.append('\r\n')
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# end of header writing
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if use_chunked[0]:
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## Write the chunked encoding
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towrite.append("%x\r\n%s\r\n" % (len(data), data))
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else:
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towrite.append(data)
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try:
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_writelines(towrite)
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length[0] = length[0] + sum(map(len, towrite))
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except UnicodeEncodeError:
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self.server.log_message("Encountered non-ascii unicode while attempting to write wsgi response: %r" % [x for x in towrite if isinstance(x, unicode)])
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self.server.log_message(traceback.format_exc())
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_writelines(
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["HTTP/1.1 500 Internal Server Error\r\n",
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"Connection: close\r\n",
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"Content-type: text/plain\r\n",
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"Content-length: 98\r\n",
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"Date: %s\r\n" % format_date_time(time.time()),
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"\r\n",
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("Internal Server Error: wsgi application passed "
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"a unicode object to the server instead of a string.")])
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def start_response(status, response_headers, exc_info=None):
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status_code[0] = status.split()[0]
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if exc_info:
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try:
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if headers_sent:
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# Re-raise original exception if headers sent
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raise exc_info[0], exc_info[1], exc_info[2]
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finally:
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# Avoid dangling circular ref
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exc_info = None
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capitalized_headers = [('-'.join([x.capitalize()
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for x in key.split('-')]), value)
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for key, value in response_headers]
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headers_set[:] = [status, capitalized_headers]
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return write
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try:
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try:
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result = self.application(self.environ, start_response)
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if (isinstance(result, _AlreadyHandled)
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or isinstance(getattr(result, '_obj', None), _AlreadyHandled)):
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self.close_connection = 1
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return
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if not headers_sent and hasattr(result, '__len__') and \
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'Content-Length' not in [h for h, _v in headers_set[1]]:
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headers_set[1].append(('Content-Length', str(sum(map(len, result)))))
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towrite = []
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towrite_size = 0
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just_written_size = 0
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for data in result:
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towrite.append(data)
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towrite_size += len(data)
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if towrite_size >= self.minimum_chunk_size:
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write(''.join(towrite))
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towrite = []
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just_written_size = towrite_size
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towrite_size = 0
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if towrite:
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just_written_size = towrite_size
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write(''.join(towrite))
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if not headers_sent or (use_chunked[0] and just_written_size):
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write('')
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except Exception:
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self.close_connection = 1
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tb = traceback.format_exc()
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self.server.log_message(tb)
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if not headers_set:
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err_body = ""
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if(self.server.debug):
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err_body = tb
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start_response("500 Internal Server Error",
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[('Content-type', 'text/plain'),
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('Content-length', len(err_body))])
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write(err_body)
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finally:
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if hasattr(result, 'close'):
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result.close()
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if (self.environ['eventlet.input'].chunked_input or
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self.environ['eventlet.input'].position \
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< self.environ['eventlet.input'].content_length):
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## Read and discard body if there was no pending 100-continue
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if not self.environ['eventlet.input'].wfile:
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while self.environ['eventlet.input'].read(MINIMUM_CHUNK_SIZE):
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pass
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finish = time.time()
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for hook, args, kwargs in self.environ['eventlet.posthooks']:
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hook(self.environ, *args, **kwargs)
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if self.server.log_output:
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self.server.log_message(self.server.log_format % dict(
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client_ip=self.get_client_ip(),
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date_time=self.log_date_time_string(),
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request_line=self.requestline,
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status_code=status_code[0],
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body_length=length[0],
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wall_seconds=finish - start))
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def get_client_ip(self):
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client_ip = self.client_address[0]
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if self.server.log_x_forwarded_for:
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forward = self.headers.get('X-Forwarded-For', '').replace(' ', '')
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if forward:
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client_ip = "%s,%s" % (forward, client_ip)
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return client_ip
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def get_environ(self):
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env = self.server.get_environ()
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env['REQUEST_METHOD'] = self.command
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env['SCRIPT_NAME'] = ''
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pq = self.path.split('?', 1)
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env['RAW_PATH_INFO'] = pq[0]
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env['PATH_INFO'] = urllib.unquote(pq[0])
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if len(pq) > 1:
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env['QUERY_STRING'] = pq[1]
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if self.headers.typeheader is None:
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env['CONTENT_TYPE'] = self.headers.type
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else:
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env['CONTENT_TYPE'] = self.headers.typeheader
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length = self.headers.getheader('content-length')
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if length:
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env['CONTENT_LENGTH'] = length
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env['SERVER_PROTOCOL'] = 'HTTP/1.0'
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host, port = self.request.getsockname()[:2]
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env['SERVER_NAME'] = host
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env['SERVER_PORT'] = str(port)
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env['REMOTE_ADDR'] = self.client_address[0]
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env['GATEWAY_INTERFACE'] = 'CGI/1.1'
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for h in self.headers.headers:
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k, v = h.split(':', 1)
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k = k.replace('-', '_').upper()
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v = v.strip()
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if k in env:
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continue
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envk = 'HTTP_' + k
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if envk in env:
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env[envk] += ',' + v
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else:
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env[envk] = v
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if env.get('HTTP_EXPECT') == '100-continue':
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wfile = self.wfile
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wfile_line = 'HTTP/1.1 100 Continue\r\n\r\n'
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else:
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wfile = None
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wfile_line = None
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chunked = env.get('HTTP_TRANSFER_ENCODING', '').lower() == 'chunked'
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env['wsgi.input'] = env['eventlet.input'] = Input(
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self.rfile, length, wfile=wfile, wfile_line=wfile_line,
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chunked_input=chunked)
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env['eventlet.posthooks'] = []
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return env
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def finish(self):
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BaseHTTPServer.BaseHTTPRequestHandler.finish(self)
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greenio.shutdown_safe(self.connection)
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self.connection.close()
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class Server(BaseHTTPServer.HTTPServer):
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def __init__(self,
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socket,
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address,
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app,
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log=None,
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environ=None,
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max_http_version=None,
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protocol=HttpProtocol,
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minimum_chunk_size=None,
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log_x_forwarded_for=True,
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keepalive=True,
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log_output=True,
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log_format=DEFAULT_LOG_FORMAT,
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url_length_limit=MAX_REQUEST_LINE,
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debug=True):
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self.outstanding_requests = 0
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self.socket = socket
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self.address = address
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if log:
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self.log = log
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else:
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self.log = sys.stderr
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self.app = app
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self.keepalive = keepalive
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self.environ = environ
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self.max_http_version = max_http_version
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self.protocol = protocol
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self.pid = os.getpid()
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if minimum_chunk_size is not None:
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protocol.minimum_chunk_size = minimum_chunk_size
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self.log_x_forwarded_for = log_x_forwarded_for
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self.log_output = log_output
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self.log_format = log_format
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self.url_length_limit = url_length_limit
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self.debug = debug
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def get_environ(self):
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d = {
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'wsgi.errors': sys.stderr,
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'wsgi.version': (1, 0),
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'wsgi.multithread': True,
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'wsgi.multiprocess': False,
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'wsgi.run_once': False,
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'wsgi.url_scheme': 'http',
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}
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# detect secure socket
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if hasattr(self.socket, 'do_handshake'):
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d['wsgi.url_scheme'] = 'https'
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d['HTTPS'] = 'on'
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if self.environ is not None:
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d.update(self.environ)
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return d
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def process_request(self, (socket, address)):
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proto = self.protocol(socket, address, self)
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proto.handle()
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def log_message(self, message):
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self.log.write(message + '\n')
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try:
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import ssl
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ACCEPT_EXCEPTIONS = (socket.error, ssl.SSLError)
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ACCEPT_ERRNO = set((errno.EPIPE, errno.EBADF, errno.ECONNRESET,
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ssl.SSL_ERROR_EOF, ssl.SSL_ERROR_SSL))
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except ImportError:
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ACCEPT_EXCEPTIONS = (socket.error,)
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ACCEPT_ERRNO = set((errno.EPIPE, errno.EBADF, errno.ECONNRESET))
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def server(sock, site,
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log=None,
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environ=None,
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max_size=None,
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max_http_version=DEFAULT_MAX_HTTP_VERSION,
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protocol=HttpProtocol,
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server_event=None,
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minimum_chunk_size=None,
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log_x_forwarded_for=True,
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custom_pool=None,
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keepalive=True,
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log_output=True,
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log_format=DEFAULT_LOG_FORMAT,
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url_length_limit=MAX_REQUEST_LINE,
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debug=True):
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""" Start up a wsgi server handling requests from the supplied server
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socket. This function loops forever. The *sock* object will be closed after server exits,
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but the underlying file descriptor will remain open, so if you have a dup() of *sock*,
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it will remain usable.
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:param sock: Server socket, must be already bound to a port and listening.
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:param site: WSGI application function.
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:param log: File-like object that logs should be written to. If not specified, sys.stderr is used.
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:param environ: Additional parameters that go into the environ dictionary of every request.
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:param max_size: Maximum number of client connections opened at any time by this server.
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:param max_http_version: Set to "HTTP/1.0" to make the server pretend it only supports HTTP 1.0. This can help with applications or clients that don't behave properly using HTTP 1.1.
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:param protocol: Protocol class. Deprecated.
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:param server_event: Used to collect the Server object. Deprecated.
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:param minimum_chunk_size: Minimum size in bytes for http chunks. This can be used to improve performance of applications which yield many small strings, though using it technically violates the WSGI spec.
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:param log_x_forwarded_for: If True (the default), logs the contents of the x-forwarded-for header in addition to the actual client ip address in the 'client_ip' field of the log line.
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:param custom_pool: A custom GreenPool instance which is used to spawn client green threads. If this is supplied, max_size is ignored.
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:param keepalive: If set to False, disables keepalives on the server; all connections will be closed after serving one request.
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:param log_output: A Boolean indicating if the server will log data or not.
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:param log_format: A python format string that is used as the template to generate log lines. The following values can be formatted into it: client_ip, date_time, request_line, status_code, body_length, wall_seconds. The default is a good example of how to use it.
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:param url_length_limit: A maximum allowed length of the request url. If exceeded, 414 error is returned.
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:param debug: True if the server should send exception tracebacks to the clients on 500 errors. If False, the server will respond with empty bodies.
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"""
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serv = Server(sock, sock.getsockname(),
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site, log,
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environ=environ,
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max_http_version=max_http_version,
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protocol=protocol,
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minimum_chunk_size=minimum_chunk_size,
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log_x_forwarded_for=log_x_forwarded_for,
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keepalive=keepalive,
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log_output=log_output,
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log_format=log_format,
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url_length_limit=url_length_limit,
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debug=debug)
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if server_event is not None:
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server_event.send(serv)
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if max_size is None:
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max_size = DEFAULT_MAX_SIMULTANEOUS_REQUESTS
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if custom_pool is not None:
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pool = custom_pool
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else:
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pool = greenpool.GreenPool(max_size)
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try:
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host, port = sock.getsockname()[:2]
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port = ':%s' % (port, )
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if hasattr(sock, 'do_handshake'):
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scheme = 'https'
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if port == ':443':
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port = ''
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else:
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scheme = 'http'
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if port == ':80':
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port = ''
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serv.log.write("(%s) wsgi starting up on %s://%s%s/\n" % (
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os.getpid(), scheme, host, port))
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while True:
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try:
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client_socket = sock.accept()
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try:
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pool.spawn_n(serv.process_request, client_socket)
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except AttributeError:
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warnings.warn("wsgi's pool should be an instance of " \
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"eventlet.greenpool.GreenPool, is %s. Please convert your"\
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" call site to use GreenPool instead" % type(pool),
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DeprecationWarning, stacklevel=2)
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pool.execute_async(serv.process_request, client_socket)
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except ACCEPT_EXCEPTIONS, e:
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if get_errno(e) not in ACCEPT_ERRNO:
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raise
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except (KeyboardInterrupt, SystemExit):
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serv.log.write("wsgi exiting\n")
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break
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finally:
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try:
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# NOTE: It's not clear whether we want this to leave the
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# socket open or close it. Use cases like Spawning want
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# the underlying fd to remain open, but if we're going
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# that far we might as well not bother closing sock at
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# all.
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sock.close()
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except socket.error, e:
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if get_errno(e) not in BROKEN_SOCK:
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traceback.print_exc()
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