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9ccf5570f8
This patch fixes a bug where hgweb would send an incomplete HTTP response. If an uncaught exception is raised when hgweb is processing a request, hgweb attempts to send a generic error response and log that exception. The server defaults to chunked transfer coding. If an uncaught exception occurred, it was sending the error response string / chunk properly. However, RFC 7230 Section 4.1 mandates a 0 size last chunk be sent to indicate end of the entity body. hgweb was failing to send this last chunk. As a result, properly written HTTP clients would assume more data was coming and they would likely time out waiting for another chunk to arrive. Mercurial's own test harness was paving over the improper HTTP behavior by not attempting to read the response body if the status code was 500. This incorrect workaround was added in faced8f5c2af and has been removed with this patch.
350 lines
12 KiB
Python
350 lines
12 KiB
Python
# hgweb/server.py - The standalone hg web server.
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#
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# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
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# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import os, sys, errno, urllib, BaseHTTPServer, socket, SocketServer, traceback
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from mercurial import util, error
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from mercurial.hgweb import common
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from mercurial.i18n import _
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def _splitURI(uri):
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"""Return path and query that has been split from uri
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Just like CGI environment, the path is unquoted, the query is
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not.
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"""
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if '?' in uri:
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path, query = uri.split('?', 1)
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else:
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path, query = uri, ''
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return urllib.unquote(path), query
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class _error_logger(object):
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def __init__(self, handler):
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self.handler = handler
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def flush(self):
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pass
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def write(self, str):
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self.writelines(str.split('\n'))
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def writelines(self, seq):
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for msg in seq:
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self.handler.log_error("HG error: %s", msg)
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class _httprequesthandler(BaseHTTPServer.BaseHTTPRequestHandler):
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url_scheme = 'http'
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@staticmethod
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def preparehttpserver(httpserver, ssl_cert):
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"""Prepare .socket of new HTTPServer instance"""
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pass
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def __init__(self, *args, **kargs):
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self.protocol_version = 'HTTP/1.1'
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BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args, **kargs)
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def _log_any(self, fp, format, *args):
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fp.write("%s - - [%s] %s\n" % (self.client_address[0],
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self.log_date_time_string(),
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format % args))
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fp.flush()
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def log_error(self, format, *args):
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self._log_any(self.server.errorlog, format, *args)
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def log_message(self, format, *args):
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self._log_any(self.server.accesslog, format, *args)
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def log_request(self, code='-', size='-'):
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xheaders = []
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if util.safehasattr(self, 'headers'):
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xheaders = [h for h in self.headers.items()
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if h[0].startswith('x-')]
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self.log_message('"%s" %s %s%s',
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self.requestline, str(code), str(size),
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''.join([' %s:%s' % h for h in sorted(xheaders)]))
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def do_write(self):
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try:
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self.do_hgweb()
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except socket.error, inst:
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if inst[0] != errno.EPIPE:
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raise
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def do_POST(self):
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try:
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self.do_write()
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except Exception:
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self._start_response("500 Internal Server Error", [])
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self._write("Internal Server Error")
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self._done()
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tb = "".join(traceback.format_exception(*sys.exc_info()))
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self.log_error("Exception happened during processing "
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"request '%s':\n%s", self.path, tb)
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def do_GET(self):
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self.do_POST()
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def do_hgweb(self):
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path, query = _splitURI(self.path)
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env = {}
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env['GATEWAY_INTERFACE'] = 'CGI/1.1'
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env['REQUEST_METHOD'] = self.command
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env['SERVER_NAME'] = self.server.server_name
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env['SERVER_PORT'] = str(self.server.server_port)
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env['REQUEST_URI'] = self.path
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env['SCRIPT_NAME'] = self.server.prefix
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env['PATH_INFO'] = path[len(self.server.prefix):]
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env['REMOTE_HOST'] = self.client_address[0]
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env['REMOTE_ADDR'] = self.client_address[0]
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if query:
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env['QUERY_STRING'] = query
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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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for header in [h for h in self.headers.keys()
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if h not in ('content-type', 'content-length')]:
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hkey = 'HTTP_' + header.replace('-', '_').upper()
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hval = self.headers.getheader(header)
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hval = hval.replace('\n', '').strip()
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if hval:
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env[hkey] = hval
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env['SERVER_PROTOCOL'] = self.request_version
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env['wsgi.version'] = (1, 0)
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env['wsgi.url_scheme'] = self.url_scheme
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if env.get('HTTP_EXPECT', '').lower() == '100-continue':
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self.rfile = common.continuereader(self.rfile, self.wfile.write)
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env['wsgi.input'] = self.rfile
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env['wsgi.errors'] = _error_logger(self)
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env['wsgi.multithread'] = isinstance(self.server,
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SocketServer.ThreadingMixIn)
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env['wsgi.multiprocess'] = isinstance(self.server,
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SocketServer.ForkingMixIn)
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env['wsgi.run_once'] = 0
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self.saved_status = None
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self.saved_headers = []
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self.sent_headers = False
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self.length = None
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self._chunked = None
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for chunk in self.server.application(env, self._start_response):
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self._write(chunk)
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if not self.sent_headers:
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self.send_headers()
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self._done()
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def send_headers(self):
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if not self.saved_status:
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raise AssertionError("Sending headers before "
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"start_response() called")
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saved_status = self.saved_status.split(None, 1)
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saved_status[0] = int(saved_status[0])
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self.send_response(*saved_status)
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self.length = None
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self._chunked = False
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for h in self.saved_headers:
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self.send_header(*h)
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if h[0].lower() == 'content-length':
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self.length = int(h[1])
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if (self.length is None and
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saved_status[0] != common.HTTP_NOT_MODIFIED):
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self._chunked = (not self.close_connection and
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self.request_version == "HTTP/1.1")
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if self._chunked:
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self.send_header('Transfer-Encoding', 'chunked')
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else:
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self.send_header('Connection', 'close')
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self.end_headers()
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self.sent_headers = True
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def _start_response(self, http_status, headers, exc_info=None):
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code, msg = http_status.split(None, 1)
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code = int(code)
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self.saved_status = http_status
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bad_headers = ('connection', 'transfer-encoding')
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self.saved_headers = [h for h in headers
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if h[0].lower() not in bad_headers]
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return self._write
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def _write(self, data):
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if not self.saved_status:
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raise AssertionError("data written before start_response() called")
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elif not self.sent_headers:
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self.send_headers()
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if self.length is not None:
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if len(data) > self.length:
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raise AssertionError("Content-length header sent, but more "
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"bytes than specified are being written.")
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self.length = self.length - len(data)
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elif self._chunked and data:
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data = '%x\r\n%s\r\n' % (len(data), data)
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self.wfile.write(data)
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self.wfile.flush()
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def _done(self):
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if self._chunked:
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self.wfile.write('0\r\n\r\n')
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self.wfile.flush()
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class _httprequesthandleropenssl(_httprequesthandler):
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"""HTTPS handler based on pyOpenSSL"""
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url_scheme = 'https'
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@staticmethod
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def preparehttpserver(httpserver, ssl_cert):
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try:
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import OpenSSL
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OpenSSL.SSL.Context
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except ImportError:
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raise util.Abort(_("SSL support is unavailable"))
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ctx = OpenSSL.SSL.Context(OpenSSL.SSL.TLSv1_METHOD)
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ctx.use_privatekey_file(ssl_cert)
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ctx.use_certificate_file(ssl_cert)
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sock = socket.socket(httpserver.address_family, httpserver.socket_type)
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httpserver.socket = OpenSSL.SSL.Connection(ctx, sock)
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httpserver.server_bind()
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httpserver.server_activate()
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def setup(self):
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self.connection = self.request
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self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)
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self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)
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def do_write(self):
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import OpenSSL
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try:
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_httprequesthandler.do_write(self)
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except OpenSSL.SSL.SysCallError, inst:
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if inst.args[0] != errno.EPIPE:
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raise
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def handle_one_request(self):
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import OpenSSL
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try:
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_httprequesthandler.handle_one_request(self)
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except (OpenSSL.SSL.SysCallError, OpenSSL.SSL.ZeroReturnError):
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self.close_connection = True
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pass
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class _httprequesthandlerssl(_httprequesthandler):
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"""HTTPS handler based on Pythons ssl module (introduced in 2.6)"""
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url_scheme = 'https'
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@staticmethod
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def preparehttpserver(httpserver, ssl_cert):
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try:
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import ssl
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ssl.wrap_socket
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except ImportError:
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raise util.Abort(_("SSL support is unavailable"))
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httpserver.socket = ssl.wrap_socket(
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httpserver.socket, server_side=True,
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certfile=ssl_cert, ssl_version=ssl.PROTOCOL_TLSv1)
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def setup(self):
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self.connection = self.request
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self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)
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self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)
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try:
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from threading import activeCount
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activeCount() # silence pyflakes
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_mixin = SocketServer.ThreadingMixIn
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except ImportError:
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if util.safehasattr(os, "fork"):
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_mixin = SocketServer.ForkingMixIn
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else:
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class _mixin(object):
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pass
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def openlog(opt, default):
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if opt and opt != '-':
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return open(opt, 'a')
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return default
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class MercurialHTTPServer(object, _mixin, BaseHTTPServer.HTTPServer):
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# SO_REUSEADDR has broken semantics on windows
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if os.name == 'nt':
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allow_reuse_address = 0
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def __init__(self, ui, app, addr, handler, **kwargs):
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BaseHTTPServer.HTTPServer.__init__(self, addr, handler, **kwargs)
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self.daemon_threads = True
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self.application = app
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handler.preparehttpserver(self, ui.config('web', 'certificate'))
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prefix = ui.config('web', 'prefix', '')
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if prefix:
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prefix = '/' + prefix.strip('/')
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self.prefix = prefix
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alog = openlog(ui.config('web', 'accesslog', '-'), sys.stdout)
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elog = openlog(ui.config('web', 'errorlog', '-'), sys.stderr)
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self.accesslog = alog
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self.errorlog = elog
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self.addr, self.port = self.socket.getsockname()[0:2]
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self.fqaddr = socket.getfqdn(addr[0])
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class IPv6HTTPServer(MercurialHTTPServer):
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address_family = getattr(socket, 'AF_INET6', None)
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def __init__(self, *args, **kwargs):
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if self.address_family is None:
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raise error.RepoError(_('IPv6 is not available on this system'))
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super(IPv6HTTPServer, self).__init__(*args, **kwargs)
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def create_server(ui, app):
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if ui.config('web', 'certificate'):
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if sys.version_info >= (2, 6):
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handler = _httprequesthandlerssl
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else:
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handler = _httprequesthandleropenssl
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else:
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handler = _httprequesthandler
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if ui.configbool('web', 'ipv6'):
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cls = IPv6HTTPServer
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else:
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cls = MercurialHTTPServer
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# ugly hack due to python issue5853 (for threaded use)
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try:
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import mimetypes
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mimetypes.init()
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except UnicodeDecodeError:
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# Python 2.x's mimetypes module attempts to decode strings
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# from Windows' ANSI APIs as ascii (fail), then re-encode them
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# as ascii (clown fail), because the default Python Unicode
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# codec is hardcoded as ascii.
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sys.argv # unwrap demand-loader so that reload() works
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reload(sys) # resurrect sys.setdefaultencoding()
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oldenc = sys.getdefaultencoding()
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sys.setdefaultencoding("latin1") # or any full 8-bit encoding
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mimetypes.init()
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sys.setdefaultencoding(oldenc)
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address = ui.config('web', 'address', '')
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port = util.getport(ui.config('web', 'port', 8000))
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try:
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return cls(ui, app, (address, port), handler)
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except socket.error, inst:
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raise util.Abort(_("cannot start server at '%s:%d': %s")
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% (address, port, inst.args[1]))
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