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# server.py - inotify common protocol code
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#
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# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>
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# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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import cStringIO, socket, struct
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"""
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Protocol between inotify clients and server:
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Client sending query:
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1) send protocol version number
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2) send query type (string, 4 letters long)
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3) send query parameters:
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- For STAT, N+1 \0-separated strings:
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1) N different names that need checking
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2) 1 string containing all the status types to match
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- No parameter needed for DBUG
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Server sending query answer:
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1) send protocol version number
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2) send query type
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3) send struct.pack'ed headers describing the length of the content:
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e.g. for STAT, receive 9 integers describing the length of the
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9 \0-separated string lists to be read:
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* one file list for each lmar!?ic status type
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* one list containing the directories visited during lookup
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"""
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version = 3
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resphdrfmts = {
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'STAT': '>lllllllll', # status requests
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'DBUG': '>l' # debugging queries
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}
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resphdrsizes = dict((k, struct.calcsize(v))
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for k, v in resphdrfmts.iteritems())
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def recvcs(sock):
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cs = cStringIO.StringIO()
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s = True
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try:
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while s:
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s = sock.recv(65536)
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cs.write(s)
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finally:
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sock.shutdown(socket.SHUT_RD)
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cs.seek(0)
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return cs
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