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# Python modules
import time
import sys
PY_MAJOR_VERSION = sys.version_info[0]
# hashlib is only available in Python >= 2.5. I still want to support
# older Pythons so I import md5 if hashlib is not available. Fortunately
# md5 can masquerade as hashlib for my purposes.
try:
import hashlib
except ImportError:
import md5 as hashlib
# 3rd party modules
import sysv_ipc
# Utils for this demo
import utils
if PY_MAJOR_VERSION > 2:
import utils_for_3 as flex_utils
else:
import utils_for_2 as flex_utils
params = utils.read_params()
# Mrs. Premise has already created the message queue. I just need a handle
# to it.
mq = sysv_ipc.MessageQueue(params["KEY"])
what_i_sent = ""
for i in range(0, params["ITERATIONS"]):
utils.say("iteration %d" % i)
s, _ = mq.receive()
s = s.decode()
utils.say("Received %s" % s)
while s == what_i_sent:
# Nothing new; give Mrs. Premise another chance to respond.
mq.send(s)
s, _ = mq.receive()
s = s.decode()
utils.say("Received %s" % s)
if what_i_sent:
if PY_MAJOR_VERSION > 2:
what_i_sent = what_i_sent.encode()
try:
assert(s == hashlib.md5(what_i_sent).hexdigest())
except:
flex_utils.raise_error(AssertionError,
"Message corruption after %d iterations." % i)
#else:
# When what_i_sent is blank, this is the first message which
# I always accept without question.
# MD5 the reply and write back to Mrs. Premise.
s = hashlib.md5(s.encode()).hexdigest()
utils.say("Sending %s" % s)
mq.send(s)
what_i_sent = s
utils.say("")
utils.say("%d iterations complete" % (i + 1))
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