hgweb: remove dead code handling UnicodeDecodeError

I’m quite confident that the error can’t happen on Python 3, as the main
motivation for separating bytes and str in Python 3 was to avoid this class of
errors.

mercurial/hgweb/server.py

@@ -1,436 +1,418 b''
 # hgweb/server.py - The standalone hg web server.
 #
 # Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
 # Copyright 2005-2007 Olivia Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 
 import errno
-import importlib
 import os
 import socket
 import sys
 import traceback
 import wsgiref.validate
 
 from ..i18n import _
 from ..pycompat import (
     getattr,
     open,
 )
 
 from .. import (
     encoding,
     error,
     pycompat,
     util,
 )
 from ..utils import (
     urlutil,
 )
 
 httpservermod = util.httpserver
 socketserver = util.socketserver
 urlerr = util.urlerr
 urlreq = util.urlreq
 
 from . import common
 
 
 def _splitURI(uri):
     """Return path and query that has been split 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, r''
     return urlreq.unquote(path), query
 
 
 class _error_logger:
     def __init__(self, handler):
         self.handler = handler
 
     def flush(self):
         pass
 
     def write(self, str):
         self.writelines(str.split(b'\n'))
 
     def writelines(self, seq):
         for msg in seq:
             self.handler.log_error("HG error:  %s", encoding.strfromlocal(msg))
 
 
 class _httprequesthandler(httpservermod.basehttprequesthandler):
 
     url_scheme = b'http'
 
     @staticmethod
     def preparehttpserver(httpserver, ui):
         """Prepare .socket of new HTTPServer instance"""
 
     def __init__(self, *args, **kargs):
         self.protocol_version = r'HTTP/1.1'
         httpservermod.basehttprequesthandler.__init__(self, *args, **kargs)
 
     def _log_any(self, fp, format, *args):
         fp.write(
             pycompat.sysbytes(
                 r"%s - - [%s] %s"
                 % (
                     self.client_address[0],
                     self.log_date_time_string(),
                     format % args,
                 )
             )
             + b'\n'
         )
         fp.flush()
 
     def log_error(self, format, *args):
         self._log_any(self.server.errorlog, format, *args)
 
     def log_message(self, format, *args):
         self._log_any(self.server.accesslog, format, *args)
 
     def log_request(self, code='-', size='-'):
         xheaders = []
         if util.safehasattr(self, b'headers'):
             xheaders = [
                 h for h in self.headers.items() if h[0].startswith('x-')
             ]
         self.log_message(
             '"%s" %s %s%s',
             self.requestline,
             str(code),
             str(size),
             ''.join([' %s:%s' % h for h in sorted(xheaders)]),
         )
 
     def do_write(self):
         try:
             self.do_hgweb()
         except socket.error as inst:
             if inst.errno != errno.EPIPE:
                 raise
 
     def do_POST(self):
         try:
             self.do_write()
         except Exception as e:
             # I/O below could raise another exception. So log the original
             # exception first to ensure it is recorded.
             if not (
                 isinstance(e, (OSError, socket.error))
                 and e.errno == errno.ECONNRESET
             ):
                 tb = "".join(traceback.format_exception(*sys.exc_info()))
                 # We need a native-string newline to poke in the log
                 # message, because we won't get a newline when using an
                 # r-string. This is the easy way out.
                 newline = chr(10)
                 self.log_error(
                     r"Exception happened during processing "
                     "request '%s':%s%s",
                     self.path,
                     newline,
                     tb,
                 )
 
             self._start_response("500 Internal Server Error", [])
             self._write(b"Internal Server Error")
             self._done()
 
     def do_PUT(self):
         self.do_POST()
 
     def do_GET(self):
         self.do_POST()
 
     def do_hgweb(self):
         self.sent_headers = False
         path, query = _splitURI(self.path)
 
         # Ensure the slicing of path below is valid
         if path != self.server.prefix and not path.startswith(
             self.server.prefix + b'/'
         ):
             self._start_response(pycompat.strurl(common.statusmessage(404)), [])
             if self.command == 'POST':
                 # Paranoia: tell the client we're going to close the
                 # socket so they don't try and reuse a socket that
                 # might have a POST body waiting to confuse us. We do
                 # this by directly munging self.saved_headers because
                 # self._start_response ignores Connection headers.
                 self.saved_headers = [('Connection', 'Close')]
             self._write(b"Not Found")
             self._done()
             return
 
         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['SCRIPT_NAME'] = pycompat.sysstr(self.server.prefix)
         env['PATH_INFO'] = pycompat.sysstr(path[len(self.server.prefix) :])
         env['REMOTE_HOST'] = self.client_address[0]
         env['REMOTE_ADDR'] = self.client_address[0]
         env['QUERY_STRING'] = query or ''
 
         if self.headers.get_content_type() is None:
             env['CONTENT_TYPE'] = self.headers.get_default_type()
         else:
             env['CONTENT_TYPE'] = self.headers.get_content_type()
         length = self.headers.get('content-length')
         if length:
             env['CONTENT_LENGTH'] = length
         for header in [
             h
             for h in self.headers.keys()
             if h.lower() not in ('content-type', 'content-length')
         ]:
             hkey = 'HTTP_' + header.replace('-', '_').upper()
             hval = self.headers.get(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'] = pycompat.sysstr(self.url_scheme)
         if env.get('HTTP_EXPECT', b'').lower() == b'100-continue':
             self.rfile = common.continuereader(self.rfile, self.wfile.write)
 
         env['wsgi.input'] = self.rfile
         env['wsgi.errors'] = _error_logger(self)
         env['wsgi.multithread'] = isinstance(
             self.server, socketserver.ThreadingMixIn
         )
         if util.safehasattr(socketserver, b'ForkingMixIn'):
             env['wsgi.multiprocess'] = isinstance(
                 self.server, socketserver.ForkingMixIn
             )
         else:
             env['wsgi.multiprocess'] = False
 
         env['wsgi.run_once'] = 0
 
         wsgiref.validate.check_environ(env)
 
         self.saved_status = None
         self.saved_headers = []
         self.length = None
         self._chunked = None
         for chunk in self.server.application(env, self._start_response):
             self._write(chunk)
         if not self.sent_headers:
             self.send_headers()
         self._done()
 
     def send_headers(self):
         if not self.saved_status:
             raise AssertionError(
                 b"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)
         self.length = None
         self._chunked = False
         for h in self.saved_headers:
             self.send_header(*h)
             if h[0].lower() == 'content-length':
                 self.length = int(h[1])
         if self.length is None and saved_status[0] != common.HTTP_NOT_MODIFIED:
             self._chunked = (
                 not self.close_connection and self.request_version == 'HTTP/1.1'
             )
             if self._chunked:
                 self.send_header('Transfer-Encoding', 'chunked')
             else:
                 self.send_header('Connection', 'close')
         self.end_headers()
         self.sent_headers = True
 
     def _start_response(self, http_status, headers, exc_info=None):
         assert isinstance(http_status, str)
         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(b"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(
                     b"Content-length header sent, but more "
                     b"bytes than specified are being written."
                 )
             self.length = self.length - len(data)
         elif self._chunked and data:
             data = b'%x\r\n%s\r\n' % (len(data), data)
         self.wfile.write(data)
         self.wfile.flush()
 
     def _done(self):
         if self._chunked:
             self.wfile.write(b'0\r\n\r\n')
             self.wfile.flush()
 
     def version_string(self):
         if self.server.serverheader:
             return encoding.strfromlocal(self.server.serverheader)
         return httpservermod.basehttprequesthandler.version_string(self)
 
 
 class _httprequesthandlerssl(_httprequesthandler):
     """HTTPS handler based on Python's ssl module"""
 
     url_scheme = b'https'
 
     @staticmethod
     def preparehttpserver(httpserver, ui):
         try:
             from .. import sslutil
 
             sslutil.wrapserversocket
         except ImportError:
             raise error.Abort(_(b"SSL support is unavailable"))
 
         certfile = ui.config(b'web', b'certificate')
 
         # These config options are currently only meant for testing. Use
         # at your own risk.
         cafile = ui.config(b'devel', b'servercafile')
         reqcert = ui.configbool(b'devel', b'serverrequirecert')
 
         httpserver.socket = sslutil.wrapserversocket(
             httpserver.socket,
             ui,
             certfile=certfile,
             cafile=cafile,
             requireclientcert=reqcert,
         )
 
     def setup(self):
         self.connection = self.request
         self.rfile = self.request.makefile("rb", self.rbufsize)
         self.wfile = self.request.makefile("wb", self.wbufsize)
 
 
 try:
     import threading
 
     threading.active_count()  # silence pyflakes and bypass demandimport
     _mixin = socketserver.ThreadingMixIn
 except ImportError:
     if util.safehasattr(os, b"fork"):
         _mixin = socketserver.ForkingMixIn
     else:
 
         class _mixin:
             pass
 
 
 def openlog(opt, default):
     if opt and opt != b'-':
         return open(opt, b'ab')
     return default
 
 
 class MercurialHTTPServer(_mixin, httpservermod.httpserver, object):
 
     # SO_REUSEADDR has broken semantics on windows
     if pycompat.iswindows:
         allow_reuse_address = 0
 
     def __init__(self, ui, app, addr, handler, **kwargs):
         httpservermod.httpserver.__init__(self, addr, handler, **kwargs)
         self.daemon_threads = True
         self.application = app
 
         handler.preparehttpserver(self, ui)
 
         prefix = ui.config(b'web', b'prefix')
         if prefix:
             prefix = b'/' + prefix.strip(b'/')
         self.prefix = prefix
 
         alog = openlog(ui.config(b'web', b'accesslog'), ui.fout)
         elog = openlog(ui.config(b'web', b'errorlog'), ui.ferr)
         self.accesslog = alog
         self.errorlog = elog
 
         self.addr, self.port = self.socket.getsockname()[0:2]
         self.fqaddr = self.server_name
 
         self.serverheader = ui.config(b'web', b'server-header')
 
 
 class IPv6HTTPServer(MercurialHTTPServer):
     address_family = getattr(socket, 'AF_INET6', None)
 
     def __init__(self, *args, **kwargs):
         if self.address_family is None:
             raise error.RepoError(_(b'IPv6 is not available on this system'))
         super(IPv6HTTPServer, self).__init__(*args, **kwargs)
 
 
 def create_server(ui, app):
 
     if ui.config(b'web', b'certificate'):
         handler = _httprequesthandlerssl
     else:
         handler = _httprequesthandler
 
     if ui.configbool(b'web', b'ipv6'):
         cls = IPv6HTTPServer
     else:
         cls = MercurialHTTPServer
 
     # ugly hack due to python issue5853 (for threaded use)
-    try:
         import mimetypes
 
         mimetypes.init()
-    except UnicodeDecodeError:
-        # Python 2.x's mimetypes module attempts to decode strings
-        # from Windows' ANSI APIs as ascii (fail), then re-encode them
-        # as ascii (clown fail), because the default Python Unicode
-        # codec is hardcoded as ascii.
-
-        sys.argv  # unwrap demand-loader so that reload() works
-        # resurrect sys.setdefaultencoding()
-        try:
-            importlib.reload(sys)
-        except AttributeError:
-            reload(sys)
-        oldenc = sys.getdefaultencoding()
-        sys.setdefaultencoding(b"latin1")  # or any full 8-bit encoding
-        mimetypes.init()
-        sys.setdefaultencoding(oldenc)
 
     address = ui.config(b'web', b'address')
     port = urlutil.getport(ui.config(b'web', b'port'))
     try:
         return cls(ui, app, (address, port), handler)
     except socket.error as inst:
         raise error.Abort(
             _(b"cannot start server at '%s:%d': %s")
             % (address, port, encoding.strtolocal(inst.args[1]))
         )

tests/test-check-pyflakes.t

@@ -1,33 +1,32 b''
 #require test-repo pyflakes hg10
 
   $ . "$TESTDIR/helpers-testrepo.sh"
 
 run pyflakes on all tracked files ending in .py or without a file ending
 (skipping binary file random-seed)
 
   $ cat > test.py <<EOF
   > print(undefinedname)
   > EOF
   $ "$PYTHON" -m pyflakes test.py 2>/dev/null | "$TESTDIR/filterpyflakes.py"
   test.py:1:* undefined name 'undefinedname' (glob)
   
   $ cd "`dirname "$TESTDIR"`"
 
   $ testrepohg locate 'set:**.py or grep("^#!.*python")' \
   > -X hgext/fsmonitor/pywatchman \
   > -X contrib/python-zstandard \
   > -X mercurial/thirdparty \
   > 2>/dev/null \
   > | xargs "$PYTHON" -m pyflakes 2>/dev/null | "$TESTDIR/filterpyflakes.py"
   contrib/perf.py:*:* undefined name 'xrange' (glob) (?)
-  mercurial/hgweb/server.py:*:* undefined name 'reload' (glob) (?)
   mercurial/pycompat.py:*:* 'codecs' imported but unused (glob)
   mercurial/pycompat.py:*:* 'concurrent.futures' imported but unused (glob)
   mercurial/pycompat.py:*:* 'http.client as httplib' imported but unused (glob)
   mercurial/pycompat.py:*:* 'http.cookiejar as cookielib' imported but unused (glob)
   mercurial/pycompat.py:*:* 'io' imported but unused (glob)
   mercurial/pycompat.py:*:* 'queue' imported but unused (glob)
   mercurial/pycompat.py:*:* 'socketserver' imported but unused (glob)
   mercurial/pycompat.py:*:* 'xmlrpc.client as xmlrpclib' imported but unused (glob)
   mercurial/util.py:*:* 'pickle' imported but unused (glob)