view mercurial/hgweb/server.py @ 6858:8f256bf98219

Add support for multiple possible bisect results (issue1228, issue1182)

The real reason for both issue is that bisect can not handle cases where there
are multiple possibilities for the result.

Example (from issue1228):
rev 0 -> good
rev 1 -> skipped
rev 2 -> skipped
rev 3 -> skipped
rev 4 -> bad

Note that this patch does not only fix the reported Assertion Error but also
the problem of a non converging bisect:

hg init
for i in `seq 3`; do echo $i > $i; hg add $i; hg ci -m$i; done
hg bisect -b 2
hg bisect -g 0
hg bisect -s

From this state on, you can:
 a) mark as bad forever (non converging!)
 b) mark as good to get an inconsistent state
 c) skip for the Assertion Error

Minor description and code edits by pmezard.

# 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, incorporated herein by reference.

import os, sys, errno, urllib, BaseHTTPServer, socket, SocketServer, traceback
from mercurial import hg, util
from mercurial.repo import RepoError
from hgweb_mod import hgweb
from hgwebdir_mod import hgwebdir
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):

    url_scheme = 'http'

    def __init__(self, *args, **kargs):
        self.protocol_version = 'HTTP/1.1'
        BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args, **kargs)

    def _log_any(self, fp, format, *args):
        fp.write("%s - - [%s] %s\n" % (self.client_address[0],
                                       self.log_date_time_string(),
                                       format % args))
        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 do_write(self):
        try:
            self.do_hgweb()
        except socket.error, inst:
            if inst[0] != errno.EPIPE:
                raise

    def do_POST(self):
        try:
            self.do_write()
        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, 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['SCRIPT_NAME'] = self.server.prefix
        env['PATH_INFO'] = path[len(self.server.prefix):]
        env['REMOTE_HOST'] = self.client_address[0]
        env['REMOTE_ADDR'] = self.client_address[0]
        if query:
            env['QUERY_STRING'] = query

        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'] = self.url_scheme
        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
        self.server.application(env, self._start_response)

    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()

class _shgwebhandler(_hgwebhandler):

    url_scheme = 'https'

    def setup(self):
        self.connection = self.request
        self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)
        self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)

    def do_write(self):
        from OpenSSL.SSL import SysCallError
        try:
            super(_shgwebhandler, self).do_write()
        except SysCallError, inst:
            if inst.args[0] != errno.EPIPE:
                raise

    def handle_one_request(self):
        from OpenSSL.SSL import SysCallError, ZeroReturnError
        try:
            super(_shgwebhandler, self).handle_one_request()
        except (SysCallError, ZeroReturnError):
            self.close_connection = True
            pass

def create_server(ui, repo):
    use_threads = True

    def openlog(opt, default):
        if opt and opt != '-':
            return open(opt, 'a')
        return default

    if repo is None:
        myui = ui
    else:
        myui = repo.ui
    address = myui.config("web", "address", "")
    port = int(myui.config("web", "port", 8000))
    prefix = myui.config("web", "prefix", "")
    if prefix:
        prefix = "/" + prefix.strip("/")
    use_ipv6 = myui.configbool("web", "ipv6")
    webdir_conf = myui.config("web", "webdir_conf")
    ssl_cert = myui.config("web", "certificate")
    accesslog = openlog(myui.config("web", "accesslog", "-"), sys.stdout)
    errorlog = openlog(myui.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):

        # SO_REUSEADDR has broken semantics on windows
        if os.name == 'nt':
            allow_reuse_address = 0

        def __init__(self, *args, **kargs):
            BaseHTTPServer.HTTPServer.__init__(self, *args, **kargs)
            self.accesslog = accesslog
            self.errorlog = errorlog
            self.daemon_threads = True
            def make_handler():
                if webdir_conf:
                    hgwebobj = hgwebdir(webdir_conf, ui)
                elif repo is not None:
                    hgwebobj = hgweb(hg.repository(repo.ui, repo.root))
                else:
                    raise RepoError(_("There is no Mercurial repository here"
                                      " (.hg not found)"))
                return hgwebobj
            self.application = make_handler()

            if ssl_cert:
                try:
                    from OpenSSL import SSL
                    ctx = SSL.Context(SSL.SSLv23_METHOD)
                except ImportError:
                    raise util.Abort("SSL support is unavailable")
                ctx.use_privatekey_file(ssl_cert)
                ctx.use_certificate_file(ssl_cert)
                sock = socket.socket(self.address_family, self.socket_type)
                self.socket = SSL.Connection(ctx, sock)
                self.server_bind()
                self.server_activate()

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

            self.fqaddr = socket.getfqdn(address)
            try:
                socket.getaddrbyhost(self.fqaddr)
            except:
                fqaddr = address

    class IPv6HTTPServer(MercurialHTTPServer):
        address_family = getattr(socket, 'AF_INET6', None)

        def __init__(self, *args, **kwargs):
            if self.address_family is None:
                raise RepoError(_('IPv6 not available on this system'))
            super(IPv6HTTPServer, self).__init__(*args, **kwargs)

    if ssl_cert:
        handler = _shgwebhandler
    else:
        handler = _hgwebhandler

    try:
        if use_ipv6:
            return IPv6HTTPServer((address, port), handler)
        else:
            return MercurialHTTPServer((address, port), handler)
    except socket.error, inst:
        raise util.Abort(_("cannot start server at '%s:%d': %s")
                         % (address, port, inst.args[1]))