[ZODB-Dev] zeo database specific network protocol?
Jeremy Hylton
jeremy@zope.com (Jeremy Hylton)
Wed, 11 Dec 2002 23:37:22 -0500
To add it what Shane already said, the ZEO protocol has two layers on
top of TCP. The lower layer just does record marking: The next
record is 28 bytes long. The layer above that sends a message with
four fields:
- msgid -- a sequence number incremented seperately for each side
of a connection
- flags -- a bit mask, currently used only to mark asynchronous
calls
- name -- the name of the method to invoke on the server
- args -- a tuple of arguments to call the named method with
The fields are represented as a pickled 4-tuple. A pickle is a very
simple and relatively fast way to turn a python object into a
byte-string. I expect it's faster than doing any kind of XDR stuff in
pure Python.
Jeremy