def recv_server(number, bind, shape, verbosity, attrs):
'''
A simple server to catch some TENS messages from flow and dump them.
'''
import zmq
from zio import Port, Message, Node
from zio.flow import Flow
log.level = getattr(logging, verbosity.upper(), "INFO")
msg_attr = attrify(attrs)
snode = Node("server")
sport = snode.port("sport", zmq.SERVER)
sport.bind(bind)
snode.online()
sflow = Flow(sport)
bot = sflow.recv_bot()
assert (bot)
lobj = bot.label_object
lobj["direction"] = "inject"
bot.label_object = lobj
sflow.send_bot(bot)
log.debug('flow-recv-server: BOT handshake done')
sflow.flush_pay()
log.debug('flow-recv-server: looping')
while True:
msg = sflow.get(1000)
log.info(f'flow-recv-server: {msg}')
if not msg or 'EOT' == msg.label_object['flow']:
log.debug('flow-recv-server: got EOT')
sflow.send_eot() # answer
break
snode.offline()
log.debug(f'flow-recv-server: end')
class TestFlow(unittest.TestCase):
origin = 42
def setUp(self):
self.snode = Node("server", self.origin)
sport = self.snode.port("sport", zmq.SERVER)
sport.bind()
self.snode.online()
self.sflow = Flow(sport)
self.cnode = Node("client")
cport = self.cnode.port("cport", zmq.CLIENT)
cport.connect("server", "sport")
self.cnode.online()
self.cflow = Flow(cport)
def test_conversation(self):
# cflow is recver
bot = Message(label='{"credit":2,"direction":"inject"}')
self.cflow.send_bot(bot)
bot = self.sflow.recv_bot(1000)
assert (bot)
assert (self.sflow.credit == 0)
assert (self.sflow.total_credit == 2)
# sflow is sender
bot = Message(label='{"credit":2,"direction":"extract"}')
self.sflow.send_bot(bot)
bot = self.cflow.recv_bot(1000)
assert (bot)
assert (self.cflow.credit == 2)
assert (self.cflow.total_credit == 2)
self.cflow.flush_pay()
assert (self.cflow.credit == 0)
c = self.sflow.slurp_pay()
assert (c == 2)
assert (self.sflow.credit == 2)
for count in range(10):
# note, seqno normally should sequential
self.sflow.put(Message(coord=CoordHeader(seqno=100 + count)))
self.sflow.put(Message(coord=CoordHeader(seqno=200 + count)))
dat = self.cflow.get()
assert (dat.seqno == 100 + count)
dat = self.cflow.get()
assert (dat.seqno == 200 + count)
# normally, when a flow explicitly sends EOT the other end
# will recv the EOT when its trying to recv another message
# (PAY or DAT). In this test things are synchronous and so we
# explicitly recv_eot().
self.cflow.send_eot(Message())
surprise = self.sflow.recv_eot(1000)
assert (surprise)
self.sflow.send_eot(Message())
expected = self.cflow.recv_eot(1000)
assert (expected)
def test_flow_string(self):
msg = Message(label='{"extra":42}')
msg.label = stringify('DAT', **objectify(msg))
fobj = objectify(msg)
assert (fobj["extra"] == 42)
assert (fobj["flow"] == "DAT")
def tearDown(self):
self.cnode.offline()
self.snode.offline()
pass
def client_handler(ctx, pipe, bot, rule_object, writer_addr, broker_addr):
'''Connect to and marshall messages between broker and writer sockets.
Parameters
----------
bot : zio.Message
The BOT message
rule_object: dicionary
A ruleset rule object.
writer_addr :: string
The address of the writer's PULL socket to connect.
broker_addr : string
The address of the broker's SERVER socket to connect.
'''
# An HDF path to be added to every message we send to writer.
mattr = message_to_dict(bot)
rattr = dict(rule_object["attr"], **mattr)
base_path = rule_object["grouppat"].format(**rattr)
log.debug(f'client_handler(msg, "{base_path}", "{broker_addr}", "{writer_addr}")')
log.debug(bot)
pipe.signal()
push = ctx.socket(PUSH)
push.connect(writer_addr)
sock = ctx.socket(CLIENT)
port = Port("write-handler", sock)
port.connect(broker_addr)
port.online(None)
flow = Flow(port)
log.debug (f'writer({base_path}) send BOT to {broker_addr}')
flow.send_bot(bot) # this introduces us to the server
bot = flow.recv_bot()
log.debug (f'writer({base_path}) got response:\n{bot}')
flow.flush_pay()
def push_message(m):
log.debug (f'write_handler({base_path}) push {m}')
attr = message_to_dict(m)
attr['hdfgroup'] = base_path
m.label = json.dumps(attr)
push.send(m.encode())
push_message(bot)
poller = Poller()
poller.register(pipe, POLLIN)
poller.register(sock, POLLIN)
while True:
for which,_ in poller.poll():
if not which:
return
if which == pipe: # signal exit
log.debug ('write_handler pipe hit')
return
# o.w. we have flow
try:
msg = flow.get()
except Exception as err:
log.warning('flow.get error: %s %s' % (type(err),err))
continue
if not msg:
log.debug("write_handler: got EOT")
flow.send_eot()
# fixme: send an EOT also to push socket?.
break
push_message(msg)
continue
log.debug ('write_handler exiting')
pipe.signal()