Handle exceptions in do_hgweb: Send "Internal Server Error", log traceback

mercurial/hgweb/server.py

@@ -1,239 +1,246 b''
 # hgweb/server.py - The standalone hg web server.
 #
 # Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 from mercurial.demandload import demandload
 import os, sys, errno
-demandload(globals(), "urllib BaseHTTPServer socket SocketServer")
+demandload(globals(), "urllib BaseHTTPServer socket SocketServer traceback")
 demandload(globals(), "mercurial:ui,hg,util,templater")
 demandload(globals(), "hgweb_mod:hgweb hgwebdir_mod:hgwebdir request:wsgiapplication")
 from mercurial.i18n import gettext as _
 
 def _splitURI(uri):
     """ Return path and query splited from uri
 
     Just like CGI environment, the path is unquoted, the query is
     not.
     """
     if '?' in uri:
         path, query = uri.split('?', 1)
     else:
         path, query = uri, ''
     return urllib.unquote(path), query
 
 class _error_logger(object):
     def __init__(self, handler):
         self.handler = handler
     def flush(self):
         pass
     def write(self, str):
         self.writelines(str.split('\n'))
     def writelines(self, seq):
         for msg in seq:
             self.handler.log_error("HG error:  %s", msg)
 
 class _hgwebhandler(object, BaseHTTPServer.BaseHTTPRequestHandler):
     def __init__(self, *args, **kargs):
         self.protocol_version = 'HTTP/1.1'
         BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args, **kargs)
 
     def log_error(self, format, *args):
         errorlog = self.server.errorlog
         errorlog.write("%s - - [%s] %s\n" % (self.address_string(),
                                              self.log_date_time_string(),
                                              format % args))
 
     def log_message(self, format, *args):
         accesslog = self.server.accesslog
         accesslog.write("%s - - [%s] %s\n" % (self.address_string(),
                                               self.log_date_time_string(),
                                               format % args))
 
     def do_POST(self):
         try:
-            self.do_hgweb()
-        except socket.error, inst:
-            if inst[0] != errno.EPIPE:
-                raise
+            try:
+                self.do_hgweb()
+            except socket.error, inst:
+                if inst[0] != errno.EPIPE:
+                    raise
+        except StandardError, inst:
+            self._start_response("500 Internal Server Error", [])
+            self._write("Internal Server Error")
+            tb = "".join(traceback.format_exception(*sys.exc_info()))
+            self.log_error("Exception happened during processing request '%s':\n%s",
+                           self.path, tb)
 
     def do_GET(self):
         self.do_POST()
 
     def do_hgweb(self):
         path_info, query = _splitURI(self.path)
 
         env = {}
         env['GATEWAY_INTERFACE'] = 'CGI/1.1'
         env['REQUEST_METHOD'] = self.command
         env['SERVER_NAME'] = self.server.server_name
         env['SERVER_PORT'] = str(self.server.server_port)
         env['REQUEST_URI'] = self.path
         env['PATH_INFO'] = path_info
         if query:
             env['QUERY_STRING'] = query
         host = self.address_string()
         if host != self.client_address[0]:
             env['REMOTE_HOST'] = host
             env['REMOTE_ADDR'] = self.client_address[0]
 
         if self.headers.typeheader is None:
             env['CONTENT_TYPE'] = self.headers.type
         else:
             env['CONTENT_TYPE'] = self.headers.typeheader
         length = self.headers.getheader('content-length')
         if length:
             env['CONTENT_LENGTH'] = length
         for header in [h for h in self.headers.keys() \
                        if h not in ('content-type', 'content-length')]:
             hkey = 'HTTP_' + header.replace('-', '_').upper()
             hval = self.headers.getheader(header)
             hval = hval.replace('\n', '').strip()
             if hval:
                 env[hkey] = hval
         env['SERVER_PROTOCOL'] = self.request_version
         env['wsgi.version'] = (1, 0)
         env['wsgi.url_scheme'] = 'http'
         env['wsgi.input'] = self.rfile
         env['wsgi.errors'] = _error_logger(self)
         env['wsgi.multithread'] = isinstance(self.server,
                                              SocketServer.ThreadingMixIn)
         env['wsgi.multiprocess'] = isinstance(self.server,
                                               SocketServer.ForkingMixIn)
         env['wsgi.run_once'] = 0
 
         self.close_connection = True
         self.saved_status = None
         self.saved_headers = []
         self.sent_headers = False
         self.length = None
         req = self.server.reqmaker(env, self._start_response)
         for data in req:
             if data:
                 self._write(data)
 
     def send_headers(self):
         if not self.saved_status:
             raise AssertionError("Sending headers before start_response() called")
         saved_status = self.saved_status.split(None, 1)
         saved_status[0] = int(saved_status[0])
         self.send_response(*saved_status)
         should_close = True
         for h in self.saved_headers:
             self.send_header(*h)
             if h[0].lower() == 'content-length':
                 should_close = False
                 self.length = int(h[1])
         # The value of the Connection header is a list of case-insensitive
         # tokens separated by commas and optional whitespace.
         if 'close' in [token.strip().lower() for token in
                        self.headers.get('connection', '').split(',')]:
             should_close = True
         if should_close:
             self.send_header('Connection', 'close')
         self.close_connection = should_close
         self.end_headers()
         self.sent_headers = True
 
     def _start_response(self, http_status, headers, exc_info=None):
         code, msg = http_status.split(None, 1)
         code = int(code)
         self.saved_status = http_status
         bad_headers = ('connection', 'transfer-encoding')
         self.saved_headers = [ h for h in headers \
                                if h[0].lower() not in bad_headers ]
         return self._write
 
     def _write(self, data):
         if not self.saved_status:
             raise AssertionError("data written before start_response() called")
         elif not self.sent_headers:
             self.send_headers()
         if self.length is not None:
             if len(data) > self.length:
                 raise AssertionError("Content-length header sent, but more bytes than specified are being written.")
             self.length = self.length - len(data)
         self.wfile.write(data)
         self.wfile.flush()
 
 def create_server(ui, repo):
     use_threads = True
 
     def openlog(opt, default):
         if opt and opt != '-':
             return open(opt, 'w')
         return default
 
     address = ui.config("web", "address", "")
     port = int(ui.config("web", "port", 8000))
     use_ipv6 = ui.configbool("web", "ipv6")
     webdir_conf = ui.config("web", "webdir_conf")
     accesslog = openlog(ui.config("web", "accesslog", "-"), sys.stdout)
     errorlog = openlog(ui.config("web", "errorlog", "-"), sys.stderr)
 
     if use_threads:
         try:
             from threading import activeCount
         except ImportError:
             use_threads = False
 
     if use_threads:
         _mixin = SocketServer.ThreadingMixIn
     else:
         if hasattr(os, "fork"):
             _mixin = SocketServer.ForkingMixIn
         else:
             class _mixin:
                 pass
 
     class MercurialHTTPServer(object, _mixin, BaseHTTPServer.HTTPServer):
         def __init__(self, *args, **kargs):
             BaseHTTPServer.HTTPServer.__init__(self, *args, **kargs)
             self.accesslog = accesslog
             self.errorlog = errorlog
             self.repo = repo
             self.webdir_conf = webdir_conf
             self.webdirmaker = hgwebdir
             self.repoviewmaker = hgweb
             self.reqmaker = wsgiapplication(self.make_handler)
             self.daemon_threads = True
 
             addr, port = self.socket.getsockname()[:2]
             if addr in ('0.0.0.0', '::'):
                 addr = socket.gethostname()
             else:
                 try:
                     addr = socket.gethostbyaddr(addr)[0]
                 except socket.error:
                     pass
             self.addr, self.port = addr, port
 
         def make_handler(self):
             if self.webdir_conf:
                 hgwebobj = self.webdirmaker(self.webdir_conf)
             elif self.repo is not None:
                 hgwebobj = self.repoviewmaker(repo.__class__(repo.ui,
                                                              repo.origroot))
             else:
                 raise hg.RepoError(_("There is no Mercurial repository here"
                                      " (.hg not found)"))
             return hgwebobj
 
     class IPv6HTTPServer(MercurialHTTPServer):
         address_family = getattr(socket, 'AF_INET6', None)
 
         def __init__(self, *args, **kwargs):
             if self.address_family is None:
                 raise hg.RepoError(_('IPv6 not available on this system'))
             super(IPv6HTTPServer, self).__init__(*args, **kwargs)
 
     try:
         if use_ipv6:
             return IPv6HTTPServer((address, port), _hgwebhandler)
         else:
             return MercurialHTTPServer((address, port), _hgwebhandler)
     except socket.error, inst:
         raise util.Abort(_('cannot start server: %s') % inst.args[1])