etwist/http.py
author Anthony Truchet <anthony.truchet@logilab.fr>
Mon, 27 Feb 2012 09:43:15 +0100
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permissions -rw-r--r--
[repo, undo] Finish repository-side implementation of the undo feature (closes #893940) 1) Changes API for undo_transaction in order to raise an exception: the previous API returned a sequence of error, the user of the API needed to be careful to check explicitly. We change this for it to raise an UndoException with the list of errors as an attribute. 2) The server-side support for undoing update actions is finished 3) The configuration for `undo-support` is now a simple boolean Beware of the costs, both in DB space and in number of requests on the RDBMS backend, once this feture is activated. 4) Adds a txuuid param/attribute to the existing NoSuchTransaction exception.
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"""twisted server for CubicWeb web instances
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:organization: Logilab
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:copyright: 2001-2011 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb.web.http_headers import Headers
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class HTTPResponse(object):
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    """An object representing an HTTP Response to be sent to the client.
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    """
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    def __init__(self, twisted_request, code=None, headers=None, stream=None):
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        self._headers_out = headers
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        self._twreq = twisted_request
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        self._stream = stream
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        self._code = code
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        self._init_headers()
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        self._finalize()
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    def _init_headers(self):
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        if self._headers_out is None:
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            return
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        # initialize headers
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        for k, values in self._headers_out.getAllRawHeaders():
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            self._twreq.responseHeaders.setRawHeaders(k, values)
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        # add content-length if not present
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        if (self._headers_out.getHeader('content-length') is None
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            and self._stream is not None):
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           self._twreq.setHeader('content-length', len(self._stream))
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    def _finalize(self):
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        # we must set code before writing anything, else it's too late
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        if self._code is not None:
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            self._twreq.setResponseCode(self._code)
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        if self._stream is not None:
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            self._twreq.write(str(self._stream))
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        self._twreq.finish()
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    def __repr__(self):
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        return "<%s.%s code=%d>" % (self.__module__, self.__class__.__name__, self._code)
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def not_modified_response(twisted_request, headers_in):
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    headers_out = Headers()
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    for header in (
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        # Required from sec 10.3.5:
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        'date', 'etag', 'content-location', 'expires',
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        'cache-control', 'vary',
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        # Others:
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        'server', 'proxy-authenticate', 'www-authenticate', 'warning'):
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        value = headers_in.getRawHeaders(header)
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        if value is not None:
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            headers_out.setRawHeaders(header, value)
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    return HTTPResponse(twisted_request=twisted_request,
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                        headers=headers_out)