PostgreSQL version mismatch?

Hi!

I just tried to use this, but I get the following with PostgreSQL 8.4.2. Also Python 2.6 doesn't have struct._compile anymore, it uses an internal cache.

  File "/Users/fschulze/Zope/jarn/bestform/bestform/buildout/src/pgproxy/pgproxy/protocol.py", line 57, in dataReceived
    done, extra = m.consume(data)
  File "/Users/fschulze/Zope/jarn/bestform/bestform/buildout/src/pgproxy/pgproxy/messages.py", line 52, in consume
    if not self.parse_header():
  File "/Users/fschulze/Zope/jarn/bestform/bestform/buildout/src/pgproxy/pgproxy/messages.py", line 100, in parse_header
    if not self.parse_special_header():
  File "/Users/fschulze/Zope/jarn/bestform/bestform/buildout/src/pgproxy/pgproxy/messages.py", line 193, in parse_special_header
    self.raise_unknown()
  File "/Users/fschulze/Zope/jarn/bestform/bestform/buildout/src/pgproxy/pgproxy/messages.py", line 119, in raise_unknown
    self.buffer.raw_value()[:200]))
exceptions.ValueError: Unknown FrontendMessage packet: '\x00\x00\x00\x08\x04\xd2\x16/'

Start with pgproxy/protocol.py at dataReceived and pgproxy/messages.py at consume, parse_header, and parse_special_header. Reproduce the reported failure with PostgreSQL 8.4.2 and Python 2.6, then inspect the parsing and struct-related behavior. Done means the proxy handles the reported PostgreSQL message without raising Unknown FrontendMessage packet.