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import threading
import time
from nose.tools import assert_equal, assert_raises
from mne.realtime import StimServer, StimClient
from mne.externals.six.moves import queue
from mne.utils import requires_good_network
@requires_good_network
def test_connection():
"""Test TCP/IP connection for StimServer <-> StimClient.
"""
# have to start a thread to simulate the effect of two
# different computers since stim_server.start() is designed to
# be a blocking method
# use separate queues because timing matters
trig_queue1 = queue.Queue()
trig_queue2 = queue.Queue()
# start a thread to emulate 1st client
thread1 = threading.Thread(target=connect_client, args=(trig_queue1,))
thread1.daemon = True
# start another thread to emulate 2nd client
thread2 = threading.Thread(target=connect_client, args=(trig_queue2,))
thread2.daemon = True
with StimServer('localhost', port=4218, n_clients=2) as stim_server:
thread1.start()
thread2.start()
stim_server.start(timeout=4.0) # don't allow test to hang
# Add the trigger to the queue for both clients
stim_server.add_trigger(20)
# the assert_equal must be in the test_connection() method
# Hence communication between threads is necessary
trig1 = trig_queue1.get(timeout=4.0)
trig2 = trig_queue2.get(timeout=4.0)
assert_equal(trig1, 20)
# test if both clients receive the same trigger
assert_equal(trig1, trig2)
# test timeout for stim_server
with StimServer('localhost', port=4218) as stim_server:
assert_raises(StopIteration, stim_server.start, 0.1)
@requires_good_network
def connect_client(trig_queue):
"""Helper method that instantiates the StimClient.
"""
# just wait till the main thread reaches stim_server.start()
time.sleep(2.0)
# instantiate StimClient
stim_client = StimClient('localhost', port=4218)
# wait a bit more for script to reach stim_server.add_trigger()
time.sleep(2.0)
trig_queue.put(stim_client.get_trigger())
stim_client.close()
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