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  • Committer: Facundo Batista
  • Date: 2013-12-08 23:36:06 UTC
  • mfrom: (192.1.1 remove-twisted)
  • Revision ID: facundo@taniquetil.com.ar-20131208233606-tq1yvw2bm6cbdtz6
Removed twisted (kept deferreds through a new dependency).

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encuentro/utils.py
 
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# Copyright 2013 Facundo Batista
 
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#
 
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# This program is free software: you can redistribute it and/or modify it
 
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# under the terms of the GNU General Public License version 3, as published
 
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# by the Free Software Foundation.
 
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#
 
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# This program is distributed in the hope that it will be useful, but
 
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# WITHOUT ANY WARRANTY; without even the implied warranties of
 
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# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
 
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# PURPOSE.  See the GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License along
 
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# with this program.  If not, see <http://www.gnu.org/licenses/>.
 
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#
 
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# For further info, check  https://launchpad.net/encuentro
 
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"""Some useful functions."""
 
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import defer
 
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from PyQt4 import QtNetwork, QtCore
 
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_qt_network_manager = QtNetwork.QNetworkAccessManager()
 
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def download(url):
 
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    """Deferredly download an URL, non blocking."""
 
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    deferred = defer.Deferred()
 
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    def end():
 
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        """Send data through the deferred, if wasn't fired before."""
 
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        data = req.read(req.bytesAvailable())
 
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        if not deferred.called:
 
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            deferred.callback(data)
 
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    request = QtNetwork.QNetworkRequest()
 
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    request.setUrl(QtCore.QUrl(url))
 
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    req = _qt_network_manager.get(request)
 
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    req.error.connect(deferred.errback)
 
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    req.finished.connect(end)
 
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    return deferred
 
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if __name__ == "__main__":
 
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    import sys
 
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    app = QtCore.QCoreApplication(sys.argv)
 
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    url = "http://www.taniquetil.com.ar/facundo/imgs/felu-camagrande.jpg"
 
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    @defer.inline_callbacks
 
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    def _download():
 
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        """Download."""
 
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        data = yield download(url)
 
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        print "All done!", len(data), type(data)
 
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    _download()
 
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    sys.exit(app.exec_())