view mercurial/hgweb/server.py @ 41247:a89b20a49c13

rust-cpython: using MissingAncestors from Python code

As precedently done with LazyAncestors on cpython.rs, we test for the
presence of the 'rustext' module.

incrementalmissingrevs() has two callers within the Mercurial core:
`setdiscovery.partialdiscovery` and the `only()` revset.

This move shows a significant discovery performance improvement
in cases where the baseline is slow: using perfdiscovery on the PyPy
repos, prepared with `contrib/discovery-helper <repo> 50 100`, we
get averaged medians of 403ms with the Rust version vs 742ms without
(about 45% better).

But there are still indications that performance can be worse in cases
the baseline is fast, possibly due to the conversion from Python to
Rust and back becoming the bottleneck. We could measure this on
mozilla-central in cases were the delta is just a few changesets.
This requires confirmation, but if that's the reason, then an
upcoming `partialdiscovery` fully in Rust should solve the problem.

Differential Revision: https://phab.mercurial-scm.org/D5551

# hgweb/server.py - The standalone hg web server.
#
# Copyright 21 May 2005 - (c) 2005 Jake Edge <[e-mail]>
# Copyright 2005-2007 Matt 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.

from __future__ import absolute_import

import errno
import os
import socket
import sys
import traceback
import wsgiref.validate

from ..i18n import _

from .. import (
    encoding,
    error,
    pycompat,
    util,
)

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 r'?' in uri:
        path, query = uri.split(r'?', 1)
    else:
        path, query = uri, r''
    return urlreq.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 _httprequesthandler(httpservermod.basehttprequesthandler):

    url_scheme = '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)) + '\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=r'-', size=r'-'):
        xheaders = []
        if util.safehasattr(self, 'headers'):
            xheaders = [h for h in self.headers.items()
                        if h[0].startswith(r'x-')]
        self.log_message(r'"%s" %s %s%s',
                         self.requestline, str(code), str(size),
                         r''.join([r' %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:
            self._start_response(r"500 Internal Server Error", [])
            self._write(b"Internal Server Error")
            self._done()
            tb = r"".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 "
                           r"request '%s':%s%s", self.path, newline, tb)

    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 = [(r'Connection', r'Close')]
            self._write(b"Not Found")
            self._done()
            return

        env = {}
        env[r'GATEWAY_INTERFACE'] = r'CGI/1.1'
        env[r'REQUEST_METHOD'] = self.command
        env[r'SERVER_NAME'] = self.server.server_name
        env[r'SERVER_PORT'] = str(self.server.server_port)
        env[r'REQUEST_URI'] = self.path
        env[r'SCRIPT_NAME'] = pycompat.sysstr(self.server.prefix)
        env[r'PATH_INFO'] = pycompat.sysstr(path[len(self.server.prefix):])
        env[r'REMOTE_HOST'] = self.client_address[0]
        env[r'REMOTE_ADDR'] = self.client_address[0]
        env[r'QUERY_STRING'] = query or r''

        if pycompat.ispy3:
            if self.headers.get_content_type() is None:
                env[r'CONTENT_TYPE'] = self.headers.get_default_type()
            else:
                env[r'CONTENT_TYPE'] = self.headers.get_content_type()
            length = self.headers.get(r'content-length')
        else:
            if self.headers.typeheader is None:
                env[r'CONTENT_TYPE'] = self.headers.type
            else:
                env[r'CONTENT_TYPE'] = self.headers.typeheader
            length = self.headers.getheader(r'content-length')
        if length:
            env[r'CONTENT_LENGTH'] = length
        for header in [h for h in self.headers.keys()
                       if h not in (r'content-type', r'content-length')]:
            hkey = r'HTTP_' + header.replace(r'-', r'_').upper()
            hval = self.headers.get(header)
            hval = hval.replace(r'\n', r'').strip()
            if hval:
                env[hkey] = hval
        env[r'SERVER_PROTOCOL'] = self.request_version
        env[r'wsgi.version'] = (1, 0)
        env[r'wsgi.url_scheme'] = pycompat.sysstr(self.url_scheme)
        if env.get(r'HTTP_EXPECT', '').lower() == '100-continue':
            self.rfile = common.continuereader(self.rfile, self.wfile.write)

        env[r'wsgi.input'] = self.rfile
        env[r'wsgi.errors'] = _error_logger(self)
        env[r'wsgi.multithread'] = isinstance(self.server,
                                             socketserver.ThreadingMixIn)
        if util.safehasattr(socketserver, 'ForkingMixIn'):
            env[r'wsgi.multiprocess'] = isinstance(self.server,
                                                   socketserver.ForkingMixIn)
        else:
            env[r'wsgi.multiprocess'] = False

        env[r'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("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() == r'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 == r'HTTP/1.1')
            if self._chunked:
                self.send_header(r'Transfer-Encoding', r'chunked')
            else:
                self.send_header(r'Connection', r'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 = (r'connection', r'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)
        elif self._chunked and data:
            data = '%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('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 = 'https'

    @staticmethod
    def preparehttpserver(httpserver, ui):
        try:
            from .. import sslutil
            sslutil.modernssl
        except ImportError:
            raise error.Abort(_("SSL support is unavailable"))

        certfile = ui.config('web', 'certificate')

        # These config options are currently only meant for testing. Use
        # at your own risk.
        cafile = ui.config('devel', 'servercafile')
        reqcert = ui.configbool('devel', '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(r"rb", self.rbufsize)
        self.wfile = self.request.makefile(r"wb", self.wbufsize)

try:
    import threading
    threading.activeCount() # silence pyflakes and bypass demandimport
    _mixin = socketserver.ThreadingMixIn
except ImportError:
    if util.safehasattr(os, "fork"):
        _mixin = socketserver.ForkingMixIn
    else:
        class _mixin(object):
            pass

def openlog(opt, default):
    if opt and opt != '-':
        return open(opt, '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('web', 'prefix')
        if prefix:
            prefix = '/' + prefix.strip('/')
        self.prefix = prefix

        alog = openlog(ui.config('web', 'accesslog'), ui.fout)
        elog = openlog(ui.config('web', 'errorlog'), ui.ferr)
        self.accesslog = alog
        self.errorlog = elog

        self.addr, self.port = self.socket.getsockname()[0:2]
        self.fqaddr = socket.getfqdn(addr[0])

        self.serverheader = ui.config('web', '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(_('IPv6 is not available on this system'))
        super(IPv6HTTPServer, self).__init__(*args, **kwargs)

def create_server(ui, app):

    if ui.config('web', 'certificate'):
        handler = _httprequesthandlerssl
    else:
        handler = _httprequesthandler

    if ui.configbool('web', '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
        reload(sys) # resurrect sys.setdefaultencoding()
        oldenc = sys.getdefaultencoding()
        sys.setdefaultencoding("latin1") # or any full 8-bit encoding
        mimetypes.init()
        sys.setdefaultencoding(oldenc)

    address = ui.config('web', 'address')
    port = util.getport(ui.config('web', 'port'))
    try:
        return cls(ui, app, (address, port), handler)
    except socket.error as inst:
        raise error.Abort(_("cannot start server at '%s:%d': %s")
                          % (address, port, encoding.strtolocal(inst.args[1])))