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import unittest
import time, threading, random, functools
if __name__ == '__main__':
import sys, os
sys.path.insert(0, os.getcwd())
import sleekxmpp.xmlstream.statemachine as sm
class testStateMachine(unittest.TestCase):
def setUp(self): pass
def testDefaults(self):
"Test ensure transitions occur correctly in a single thread"
s = sm.StateMachine(('one','two','three'))
# self.assertTrue(s.one)
self.assertTrue(s['one'])
# self.failIf(s.two)
self.failIf(s['two'])
try:
s.booga
self.fail('s.booga is an invalid state and should throw an exception!')
except: pass #expected exception
def testTransitions(self):
"Test ensure transitions occur correctly in a single thread"
s = sm.StateMachine(('one','two','three'))
# self.assertTrue(s.one)
self.assertTrue( s.transition('one', 'two') )
# self.assertTrue( s.two )
self.assertTrue( s['two'] )
# self.failIf( s.one )
self.failIf( s['one'] )
self.assertTrue( s.transition('two', 'three') )
self.assertTrue( s['three'] )
self.failIf( s['two'] )
self.assertTrue( s.transition('three', 'one') )
self.assertTrue( s['one'] )
self.failIf( s['three'] )
# should return False immediately w/ no wait:
self.failIf( s.transition('three', 'one') )
self.assertTrue( s['one'] )
self.failIf( s['three'] )
# test fail condition w/ a short delay:
self.failIf( s.transition('two', 'three') )
# Ensure bad states are weeded out:
try:
s.transition('blah', 'three')
s.fail('Exception expected')
except: pass
try:
s.transition('one', 'blahblah')
s.fail('Exception expected')
except: pass
def testTransitionsBlocking(self):
"Test that transitions block from more than one thread"
s = sm.StateMachine(('one','two','three'))
self.assertTrue(s['one'])
now = time.time()
self.failIf( s.transition('two', 'one', wait=5.0) )
self.assertTrue( time.time() > now + 4 )
self.assertTrue( time.time() < now + 7 )
def testThreadedTransitions(self):
"Test that transitions are atomic in > one thread"
s = sm.StateMachine(('one','two','three'))
self.assertTrue(s['one'])
thread_state = {'ready': False, 'transitioned': False}
def t1():
if s['two']:
print 'thread has already transitioned!'
self.fail()
thread_state['ready'] = True
print 'Thread is ready'
# this will block until the main thread transitions to 'two'
self.assertTrue( s.transition('two','three', wait=20) )
print 'transitioned to three!'
thread_state['transitioned'] = True
thread = threading.Thread(target=t1)
thread.daemon = True
thread.start()
start = time.time()
while not thread_state['ready']:
print 'not ready'
if time.time() > start+10: self.fail('Timeout waiting for thread to init!')
time.sleep(0.1)
time.sleep(0.2) # the thread should be blocking on the 'transition' call at this point.
self.failIf( thread_state['transitioned'] ) # ensure it didn't 'go' yet.
print 'transitioning to two!'
self.assertTrue( s.transition('one','two') )
time.sleep(0.2) # second thread should have transitioned now:
self.assertTrue( thread_state['transitioned'] )
def testForRaceCondition(self):
"""Attempt to allow two threads to perform the same transition;
only one should ever make it."""
s = sm.StateMachine(('one','two','three'))
def t1(num):
while True:
if not trigger['go'] or thread_state[num] in (True,False):
time.sleep( random.random()/100 ) # < .01s
if thread_state[num] == 'quit': break
continue
thread_state[num] = s.transition('one','two' )
# print '-',
thread_count = 20
threads = []
thread_state = {}
def reset():
for c in range(thread_count): thread_state[c] = "reset"
trigger = {'go':False} # use of a plain boolean seems to be non-volatile between threads.
for c in range(thread_count):
thread_state[c] = "reset"
thread = threading.Thread( target= functools.partial(t1,c) )
threads.append( thread )
thread.daemon = True
thread.start()
for x in range(100): # this will take 10s to execute
# print "+",
trigger['go'] = True
time.sleep(.1)
trigger['go'] = False
winners = 0
for (num, state) in thread_state.items():
if state == True: winners = winners +1
elif state != False: raise Exception( "!%d!%s!" % (num,state) )
self.assertEqual( 1, winners, "Expected one winner! %d" % winners )
self.assertTrue( s.ensure('two') )
self.assertTrue( s.transition('two','one') ) # return to the first state.
reset()
# now let the threads quit gracefully:
for c in range(thread_count): thread_state[c] = 'quit'
time.sleep(2)
def testTransitionFunctions(self):
"test that a `func` argument allows or blocks the transition correctly."
s = sm.StateMachine(('one','two','three'))
def alwaysFalse(): return False
def alwaysTrue(): return True
self.failIf( s.transition('one','two', func=alwaysFalse) )
self.assertTrue(s['one'])
self.failIf(s['two'])
self.assertTrue( s.transition('one','two', func=alwaysTrue) )
self.failIf(s['one'])
self.assertTrue(s['two'])
def testTransitionFuncException(self):
"if a transition function throws an exeption, ensure we're in a sane state"
s = sm.StateMachine(('one','two','three'))
def alwaysException(): raise Exception('whups!')
try:
self.failIf( s.transition('one','two', func=alwaysException) )
self.fail("exception should have been thrown")
except: pass #expected exception
self.assertTrue(s['one'])
self.failIf(s['two'])
# ensure a subsequent attempt completes normally:
self.assertTrue( s.transition('one','two') )
self.failIf(s['one'])
self.assertTrue(s['two'])
def testContextManager(self):
s = sm.StateMachine(('one','two','three'))
with s.transition_ctx('one','two'):
self.assertTrue( s['one'] )
self.failIf( s['two'] )
#successful transition b/c no exception was thrown
self.assertTrue( s['two'] )
self.failIf( s['one'] )
# failed transition because exception is thrown:
try:
with s.transition_ctx('two','three'):
raise Exception("boom!")
self.fail('exception expected')
except: pass
self.failIf( s.current_state() in ('one','three') )
self.assertTrue( s['two'] )
def testCtxManagerTransitionFailure(self):
s = sm.StateMachine(('one','two','three'))
with s.transition_ctx('two','three') as _s:
self.assertTrue( _s['one'] )
self.failIf( _s.current_state in ('two','three') )
self.assertTrue( _s['one'] )
def r1():
print 'thread 1 started'
self.assertTrue( s.transition('one','two') )
print 'thread 1 transitioned'
def r2():
print 'thread 2 started'
self.failIf( s['two'] )
with s.transition_ctx('two','three', 10) as _s:
self.assertTrue( _s['two'] )
print 'thread 2 will transition on exit from the context manager...'
self.assertTrue( s['three'] )
t1 = threading.Thread(target=r1)
t2 = threading.Thread(target=r2)
t2.start() # this should block until r1 goes
time.sleep(1)
t1.start()
t1.join()
t2.join()
self.assertTrue( s['three'] )
suite = unittest.TestLoader().loadTestsFromTestCase(testStateMachine)
if __name__ == '__main__': unittest.main()
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