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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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from cStringIO import StringIO
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"Conventional" is used in the sense described in
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doc/developers/network-protocol.txt: a simple message with arguments and an
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* args: expecting args
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* body: expecting body (terminated by receiving a post-body status)
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* error: expecting post-body error
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* end: expecting end of message
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def __init__(self, request_handler, responder):
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MessageHandler.__init__(self)
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self.request_handler = request_handler
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self.responder = responder
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self.expecting = 'args'
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self._should_finish_body = False
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self._response_sent = False
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self.args_received = False
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def protocol_error(self, exception):
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if self.responder.response_sent:
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self.responder.send_error(exception)
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def byte_part_received(self, byte):
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if self.expecting == 'body':
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# Success. Nothing more to come except the end of message.
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self.expecting = 'end'
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# Error. Expect an error structure.
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self.expecting = 'error'
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raise errors.SmartProtocolError(
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'Non-success status byte in request body: %r' % (byte,))
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raise errors.SmartProtocolError(
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'Unexpected message part: byte(%r)' % (byte,))
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raise errors.SmartProtocolError(
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'Unexpected message part: byte(%r)' % (byte,))
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def structure_part_received(self, structure):
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if self.expecting == 'args':
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self._args_received(structure)
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elif self.expecting == 'error':
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self._error_received(structure)
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if self.args_received:
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raise errors.SmartProtocolError(
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'Unexpected message part: structure(%r)' % (structure,))
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def _args_received(self, args):
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self.expecting = 'body'
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self.request_handler.dispatch_command(args[0], args[1:])
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self.args_received = True
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self.request_handler.dispatch_command(structure[0], structure[1:])
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if self.request_handler.finished_reading:
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self._response_sent = True
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self.responder.send_response(self.request_handler.response)
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self.expecting = 'end'
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def _error_received(self, error_args):
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self.expecting = 'end'
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self.request_handler.post_body_error_received(error_args)
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def bytes_part_received(self, bytes):
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if self.expecting == 'body':
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self._should_finish_body = True
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self.request_handler.accept_body(bytes)
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raise errors.SmartProtocolError(
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'Unexpected message part: bytes(%r)' % (bytes,))
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def end_received(self):
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if self.expecting not in ['body', 'end']:
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raise errors.SmartProtocolError(
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'End of message received prematurely (while expecting %s)'
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self.expecting = 'nothing'
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self.request_handler.end_received()
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# Note that there's no intrinsic way to distinguish a monolithic body
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# from a chunk stream. A request handler knows which it is expecting
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# (once the args have been received), so it should be able to do the
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self.request_handler.accept_body(bytes)
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self.request_handler.end_of_body()
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if not self.request_handler.finished_reading:
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raise errors.SmartProtocolError(
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"Complete conventional request was received, but request "
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"handler has not finished reading.")
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if not self._response_sent:
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self.responder.send_response(self.request_handler.response)
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"Conventional request body was received, but request handler "
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"has not finished reading.")
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self.responder.send_response(self.request_handler.response)
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class ResponseHandler(object):
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self._bytes_parts.append(bytes)
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def structure_part_received(self, structure):
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if type(structure) is not tuple:
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if type(structure) is not list:
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raise errors.SmartProtocolError(
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'Args structure is not a sequence: %r' % (structure,))
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structure = tuple(structure)
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if not self._body_started:
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if self.args is not None:
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raise errors.SmartProtocolError(
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self._protocol_decoder._get_in_buffer()[:10],
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self._protocol_decoder.state_accept.__name__)
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raise errors.ConnectionReset(
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"Unexpected end of message. "
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"Please check connectivity and permissions, and report a bug "
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"if problems persist.")
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"please check connectivity and permissions",
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"(and try -Dhpss if further diagnosis is required)")
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self._protocol_decoder.accept_bytes(bytes)
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def protocol_error(self, exception):