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#!/usr/bin/env python
"""
fd_client.py
Grabs '/path/to/FDObject' on 'org.example' bus and demonstrates calling
remote methods with UNIX open file descriptors as arguments (type 'h' as
per the dbus spec).
NOTE:
Passing open UNIX filedescriptors accross RPC / ICP mechanisms such as dbus
requires the underlying transport to be a UNIX domain socket.
"""
from __future__ import print_function
from twisted.internet import defer, task
from txdbus import client
@defer.inlineCallbacks
def call_remote_verbose(obj, method, *args, **kwargs):
print('calling %s%s' % (method, args), end=' = ')
result = yield obj.callRemote(method, *args, **kwargs)
print(repr(result))
defer.returnValue(result)
@defer.inlineCallbacks
def main(reactor):
PATH = '/path/to/FDObject'
BUSN = 'org.example'
try:
bus = yield client.connect(reactor)
print('connected to dbus')
object = yield bus.getRemoteObject(BUSN, PATH)
print('obtained remote object')
except Exception as e:
print('failed obtaining remote object: %s' % (e,))
defer.returnValue(None)
# Open this source file. Ask remote to read it and return byte count.
with open(__file__, 'rb') as f:
yield call_remote_verbose(object, 'lenFD', f.fileno())
# Open this source file. Ask remote to read 10 bytes from it.
with open(__file__, 'rb') as f:
yield call_remote_verbose(object, 'readBytesFD', f.fileno(), 10)
# Like before, now exercise passing two open UNIX FDs.
# (will not be available under Twisted < 17.1.0)
with open(__file__, 'rb') as f1, open(__file__, 'rb') as f2:
fd1 = f1.fileno()
fd2 = f2.fileno()
try:
yield call_remote_verbose(object, 'readBytesTwoFDs', fd1, fd2, 5)
except Exception as e:
print('remote call failed: %s' % (e,))
bus.disconnect()
print('disconnected')
if __name__ == '__main__':
task.react(main)
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