ref: 5e81cc48bdb00a3e7ae3334728659b8f014248da
dir: /sys/src/cmd/hg/hgext/inotify/common.py/
# server.py - inotify common protocol code
#
# Copyright 2006, 2007, 2008 Bryan O'Sullivan <[email protected]>
# Copyright 2007, 2008 Brendan Cully <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
import cStringIO, socket, struct
"""
Protocol between inotify clients and server:
Client sending query:
1) send protocol version number
2) send query type (string, 4 letters long)
3) send query parameters:
- For STAT, N+1 \0-separated strings:
1) N different names that need checking
2) 1 string containing all the status types to match
- No parameter needed for DBUG
Server sending query answer:
1) send protocol version number
2) send query type
3) send struct.pack'ed headers describing the length of the content:
e.g. for STAT, receive 8 integers describing the length of the
8 \0-separated string lists ( one list for each lmar!?ic status type )
"""
version = 2
resphdrfmts = {
'STAT': '>llllllll', # status requests
'DBUG': '>l' # debugging queries
}
resphdrsizes = dict((k, struct.calcsize(v))
for k, v in resphdrfmts.iteritems())
def recvcs(sock):
cs = cStringIO.StringIO()
s = True
try:
while s:
s = sock.recv(65536)
cs.write(s)
finally:
sock.shutdown(socket.SHUT_RD)
cs.seek(0)
return cs