etwist/server.py
author Dimitri Papadopoulos <dimitri.papadopoulos@cea.fr>
Mon, 19 Oct 2015 23:39:30 +0200
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[skel] remove (what looks like) a spurious copy/paste
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""twisted server for CubicWeb web instances"""
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__docformat__ = "restructuredtext en"
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import sys
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import select
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import traceback
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import threading
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from cgi import FieldStorage, parse_header
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from six.moves.urllib.parse import urlsplit, urlunsplit
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from cubicweb.statsd_logger import statsd_timeit
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from twisted.internet import reactor, task, threads
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from twisted.web import http, server
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from twisted.web import resource
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from twisted.web.server import NOT_DONE_YET
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from logilab.mtconverter import xml_escape
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from logilab.common.decorators import monkeypatch
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from cubicweb import ConfigurationError, CW_EVENT_MANAGER
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from cubicweb.utils import json_dumps
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from cubicweb.web import DirectResponse
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from cubicweb.web.application import CubicWebPublisher
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from cubicweb.etwist.request import CubicWebTwistedRequestAdapter
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from cubicweb.etwist.http import HTTPResponse
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def start_task(interval, func):
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    lc = task.LoopingCall(func)
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    # wait until interval has expired to actually start the task, else we have
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    # to wait all tasks to be finished for the server to be actually started
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    lc.start(interval, now=False)
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class CubicWebRootResource(resource.Resource):
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    def __init__(self, config, repo):
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        resource.Resource.__init__(self)
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        self.config = config
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        # instantiate publisher here and not in init_publisher to get some
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        # checks done before daemonization (eg versions consistency)
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        self.appli = CubicWebPublisher(repo, config)
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        self.base_url = config['base-url']
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        self.https_url = config['https-url']
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        global MAX_POST_LENGTH
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        MAX_POST_LENGTH = config['max-post-length']
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    def init_publisher(self):
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        config = self.config
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        # when we have an in-memory repository, clean unused sessions every XX
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        # seconds and properly shutdown the server
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        if config['repository-uri'] == 'inmemory://':
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            if config.mode != 'test':
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                reactor.addSystemEventTrigger('before', 'shutdown',
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                                              self.shutdown_event)
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                self.appli.repo.start_looping_tasks()
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        self.set_url_rewriter()
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        CW_EVENT_MANAGER.bind('after-registry-reload', self.set_url_rewriter)
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    def start_service(self):
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        start_task(self.appli.session_handler.clean_sessions_interval,
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                   self.appli.session_handler.clean_sessions)
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    def set_url_rewriter(self):
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        self.url_rewriter = self.appli.vreg['components'].select_or_none('urlrewriter')
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    def shutdown_event(self):
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        """callback fired when the server is shutting down to properly
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        clean opened sessions
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        """
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        self.appli.repo.shutdown()
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    def getChild(self, path, request):
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        """Indicate which resource to use to process down the URL's path"""
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        return self
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    def render(self, request):
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        """Render a page from the root resource"""
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        # reload modified files in debug mode
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        if self.config.debugmode:
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            self.config.uiprops.reload_if_needed()
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            if self.https_url:
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                self.config.https_uiprops.reload_if_needed()
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            self.appli.vreg.reload_if_needed()
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        if self.config['profile']: # default profiler don't trace threads
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            return self.render_request(request)
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        else:
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            deferred = threads.deferToThread(self.render_request, request)
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            return NOT_DONE_YET
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    @statsd_timeit
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    def render_request(self, request):
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   111
        try:
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   112
            # processing HUGE files (hundred of megabytes) in http.processReceived
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   113
            # blocks other HTTP requests processing
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   114
            # due to the clumsy & slow parsing algorithm of cgi.FieldStorage
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   115
            # so we deferred that part to the cubicweb thread
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   116
            request.process_multipart()
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   117
            return self._render_request(request)
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2a164a9cf81c [exceptions] stop catching any exception in various places (closes #1942716)
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   118
        except Exception:
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Rémi Cardona <remi.cardona@logilab.fr>
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   119
            trace = traceback.format_exc()
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   120
            return HTTPResponse(stream='<pre>%s</pre>' % xml_escape(trace),
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   121
                                code=500, twisted_request=request)
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   122
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   123
    def _render_request(self, request):
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        origpath = request.path
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        host = request.host
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        # dual http/https access handling: expect a rewrite rule to prepend
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        # 'https' to the path to detect https access
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        https = False
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        if origpath.split('/', 2)[1] == 'https':
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            origpath = origpath[6:]
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            request.uri = request.uri[6:]
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            https = True
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        if self.url_rewriter is not None:
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   134
            # XXX should occur before authentication?
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            path = self.url_rewriter.rewrite(host, origpath, request)
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            request.uri.replace(origpath, path, 1)
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        else:
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            path = origpath
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        req = CubicWebTwistedRequestAdapter(request, self.appli.vreg, https)
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        try:
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   141
            ### Try to generate the actual request content
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   142
            content = self.appli.handle_request(req, path)
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358d8bed9626 [toward-py3k] rewrite to "except AnException as exc:" (part of #2711624)
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   143
        except DirectResponse as ex:
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            return ex.response
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   145
        # at last: create twisted object
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        return HTTPResponse(code    = req.status_out,
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                            headers = req.headers_out,
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   148
                            stream  = content,
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   149
                            twisted_request=req._twreq)
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    # these are overridden by set_log_methods below
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    # only defining here to prevent pylint from complaining
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    @classmethod
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    def debug(cls, msg, *a, **kw):
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        pass
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   156
    info = warning = error = critical = exception = debug
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   157
0
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   159
JSON_PATHS = set(('json',))
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FRAME_POST_PATHS = set(('validateform',))
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orig_gotLength = http.Request.gotLength
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   163
@monkeypatch(http.Request)
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   164
def gotLength(self, length):
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    orig_gotLength(self, length)
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   166
    if length > MAX_POST_LENGTH: # length is 0 on GET
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   167
        path = self.channel._path.split('?', 1)[0].rstrip('/').rsplit('/', 1)[-1]
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   168
        self.clientproto = 'HTTP/1.1' # not yet initialized
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   169
        self.channel.persistent = 0   # force connection close on cleanup
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   170
        self.setResponseCode(http.REQUEST_ENTITY_TOO_LARGE)
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   171
        if path in JSON_PATHS: # XXX better json path detection
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   172
            self.setHeader('content-type',"application/json")
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   173
            body = json_dumps({'reason': 'request max size exceeded'})
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   174
        elif path in FRAME_POST_PATHS: # XXX better frame post path detection
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   175
            self.setHeader('content-type',"text/html")
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   176
            body = ('<script type="text/javascript">'
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   177
                    'window.parent.handleFormValidationResponse(null, null, null, %s, null);'
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   178
                    '</script>' % json_dumps( (False, 'request max size exceeded', None) ))
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   179
        else:
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            self.setHeader('content-type',"text/html")
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   181
            body = ("<html><head><title>Processing Failed</title></head><body>"
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   182
                    "<b>request max size exceeded</b></body></html>")
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   183
        self.setHeader('content-length', str(len(body)))
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   184
        self.write(body)
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   185
        # see request.finish(). Done here since we get error due to not full
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   186
        # initialized request
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   187
        self.finished = 1
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   188
        if not self.queued:
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   189
            self._cleanup()
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   190
        for d in self.notifications:
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   191
            d.callback(None)
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   192
        self.notifications = []
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   194
@monkeypatch(http.Request)
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   195
def requestReceived(self, command, path, version):
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   196
    """Called by channel when all data has been received.
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   197
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   198
    This method is not intended for users.
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   199
    """
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   200
    self.content.seek(0, 0)
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   201
    self.args = {}
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   202
    self.files = {}
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diff changeset
   203
    self.stack = []
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   204
    self.method, self.uri = command, path
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   205
    self.clientproto = version
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   206
    x = self.uri.split('?', 1)
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   207
    if len(x) == 1:
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   208
        self.path = self.uri
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    else:
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   210
        self.path, argstring = x
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   211
        self.args = http.parse_qs(argstring, 1)
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   212
    # cache the client and server information, we'll need this later to be
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   213
    # serialized and sent with the request so CGIs will work remotely
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    self.client = self.channel.transport.getPeer()
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    self.host = self.channel.transport.getHost()
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    # Argument processing
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    ctype = self.getHeader('content-type')
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    self._do_process_multipart = False
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    if self.method == "POST" and ctype:
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        key, pdict = parse_header(ctype)
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        if key == 'application/x-www-form-urlencoded':
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            self.args.update(http.parse_qs(self.content.read(), 1))
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            self.content.seek(0)
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        elif key == 'multipart/form-data':
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            # defer this as it can be extremely time consumming
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            # with big files
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            self._do_process_multipart = True
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    self.process()
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@monkeypatch(http.Request)
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def process_multipart(self):
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    if not self._do_process_multipart:
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        return
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    form = FieldStorage(self.content, self.received_headers,
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                        environ={'REQUEST_METHOD': 'POST'},
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                        keep_blank_values=1,
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                        strict_parsing=1)
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    for key in form:
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        values = form[key]
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        if not isinstance(values, list):
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            values = [values]
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        for value in values:
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            if value.filename:
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                if value.done != -1: # -1 is transfer has been interrupted
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                    self.files.setdefault(key, []).append((value.filename, value.file))
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                else:
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                    self.files.setdefault(key, []).append((None, None))
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            else:
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                self.args.setdefault(key, []).append(value.value)
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from logging import getLogger
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from cubicweb import set_log_methods
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LOGGER = getLogger('cubicweb.twisted')
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set_log_methods(CubicWebRootResource, LOGGER)
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def run(config, debug=None, repo=None):
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    # repo may by passed during test.
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    #
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    # Test has already created a repo object so we should not create a new one.
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    # Explicitly passing the repo object avoid relying on the fragile
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    # config.repository() cache. We could imagine making repo a mandatory
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    # argument and receives it from the starting command directly.
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    if debug is not None:
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        config.debugmode = debug
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    config.check_writeable_uid_directory(config.appdatahome)
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    # create the site
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    if repo is None:
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        repo = config.repository()
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    root_resource = CubicWebRootResource(config, repo)
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    website = server.Site(root_resource)
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    # serve it via standard HTTP on port set in the configuration
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    port = config['port'] or 8080
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    interface = config['interface']
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    reactor.suggestThreadPoolSize(config['webserver-threadpool-size'])
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    reactor.listenTCP(port, website, interface=interface)
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    if not config.debugmode:
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        if sys.platform == 'win32':
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            raise ConfigurationError("Under windows, you must use the service management "
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                                     "commands (e.g : 'net start my_instance)'")
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        from logilab.common.daemon import daemonize
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        LOGGER.info('instance started in the background on %s', root_resource.base_url)
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        whichproc = daemonize(config['pid-file'], umask=config['umask'])
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        if whichproc: # 1 = orig process, 2 = first fork, None = second fork (eg daemon process)
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            return whichproc # parent process
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    root_resource.init_publisher() # before changing uid
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    if config['uid'] is not None:
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        from logilab.common.daemon import setugid
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        setugid(config['uid'])
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    root_resource.start_service()
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    LOGGER.info('instance started on %s', root_resource.base_url)
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    # avoid annoying warnign if not in Main Thread
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    signals = threading.currentThread().getName() == 'MainThread'
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    if config['profile']:
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        import cProfile
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        cProfile.runctx('reactor.run(installSignalHandlers=%s)' % signals,
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                        globals(), locals(), config['profile'])
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    else:
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        reactor.run(installSignalHandlers=signals)