async def ping_observing_task(address):
logger = logging.getLogger('moler.user.app-code')
# Lowest layer of Moler's usage (you manually glue all elements):
# 1. create observer
net_down_detector = NetworkDownDetector('10.0.2.15')
# 2. ThreadedMolerConnection is a proxy-glue between observer (speaks str)
# and asyncio-connection (speaks bytes)
moler_conn = ThreadedMolerConnection(
decoder=lambda data: data.decode("utf-8"))
# 3a. glue from proxy to observer
moler_conn.subscribe(net_down_detector.data_received)
logger.debug('waiting for data to observe')
async for connection_data in tcp_connection(address):
# 3b. glue to proxy from external-IO (asyncio tcp client connection)
# (client code has to pass it's received data into Moler's connection)
moler_conn.data_received(connection_data)
# 4. Moler's client code must manually check status of observer ...
if net_down_detector.done():
# 5. ... to know when it can ask for result
net_down_time = net_down_detector.result()
timestamp = time.strftime("%H:%M:%S",
time.localtime(net_down_time))
logger.debug('Network is down from {}'.format(timestamp))
break
def ping_observing_task(address, ping_ip):
logger = logging.getLogger('moler.user.app-code')
net_addr = 'tcp://{}:{}'.format(*address)
# Lowest layer of Moler's usage (you manually glue all elements):
# 1. create observers
net_down_detector = NetworkDownDetector(ping_ip)
net_drop_found = False
net_up_detector = NetworkUpDetector(ping_ip)
moler_conn = ObservableConnection(decoder=lambda data: data.decode("utf-8"))
# 2. virtually "start" observer by making it data-listener
moler_conn.subscribe(net_down_detector.data_received)
info = '{} on {} using {}'.format(ping_ip, net_addr, net_down_detector)
logger.debug('observe ' + info)
for _ in tcp_connection(address, moler_conn):
# anytime new data comes it may change status of observer
if not net_drop_found and net_down_detector.done():
net_drop_found = True
net_down_time = net_down_detector.result()
timestamp = time.strftime("%H:%M:%S", time.localtime(net_down_time))
logger.debug('Network {} is down from {}'.format(ping_ip, timestamp))
# 3. virtually "stop" that observer
moler_conn.unsubscribe(net_down_detector.data_received)
# 4. and start subsequent one (to know when net is back "up")
info = '{} on {} using {}'.format(ping_ip, net_addr, net_up_detector)
logger.debug('observe ' + info)
moler_conn.subscribe(net_up_detector.data_received)
if net_up_detector.done():
net_up_time = net_up_detector.result()
timestamp = time.strftime("%H:%M:%S", time.localtime(net_up_time))
logger.debug('Network {} is back "up" from {}'.format(ping_ip, timestamp))
# 5. virtually "stop" that observer
moler_conn.unsubscribe(net_up_detector.data_received)
break
def ping_observing_task(ext_io_connection, ping_ip):
"""
Here external-IO connection is abstract - we don't know its type.
What we know is just that it has .moler_connection attribute.
"""
logger = logging.getLogger('moler.user.app-code')
conn_addr = str(ext_io_connection)
# Layer 2 of Moler's usage (ext_io_connection + runner):
# 3. create observers on Moler's connection
net_down_detector = NetworkDownDetector(
ping_ip,
connection=ext_io_connection.moler_connection,
runner=get_runner(variant="asyncio-in-thread"))
net_up_detector = NetworkUpDetector(
ping_ip,
connection=ext_io_connection.moler_connection,
runner=get_runner(variant="asyncio-in-thread"))
info = '{} on {} using {}'.format(ping_ip, conn_addr, net_down_detector)
logger.debug('observe ' + info)
# 4. start observer (nonblocking, using as future)
net_down_detector.start() # should be started before we open connection
# to not loose first data on connection
with ext_io_connection:
# 5. await that observer to complete
try:
net_down_time = net_down_detector.await_done(
timeout=10) # =2 --> TimeoutError
timestamp = time.strftime("%H:%M:%S",
time.localtime(net_down_time))
logger.debug('Network {} is down from {}'.format(
ping_ip, timestamp))
except ConnectionObserverTimeout:
logger.debug('Network down detector timed out')
# 6. call next observer (blocking till completes)
info = '{} on {} using {}'.format(ping_ip, conn_addr, net_up_detector)
logger.debug('observe ' + info)
# using as synchronous function (so we want verb to express action)
detect_network_up = net_up_detector
net_up_time = detect_network_up(
) # if you want timeout - see code above
timestamp = time.strftime("%H:%M:%S", time.localtime(net_up_time))
logger.debug('Network {} is back "up" from {}'.format(
ping_ip, timestamp))
logger.debug('exiting ping_observing_task({})'.format(ping_ip))
def ping_observing_task(ext_io_connection, ping_ip):
"""
Here external-IO connection is abstract - we don't know its type.
What we know is just that it has .moler_connection attribute.
"""
logger = logging.getLogger('moler.user.app-code')
conn_addr = str(ext_io_connection)
# Layer 2 of Moler's usage (ext_io_connection):
# 1. create observers
net_down_detector = NetworkDownDetector(ping_ip)
net_drop_found = False
net_up_detector = NetworkUpDetector(ping_ip)
moler_conn = ext_io_connection.moler_connection
# 2. virtually "start" observer by making it data-listener
moler_conn.subscribe(net_down_detector.data_received)
info = '{} on {} using {}'.format(ping_ip, conn_addr, net_down_detector)
logger.debug('observe ' + info)
with ext_io_connection.open():
observing_timeout = 10
start_time = time.time()
while time.time() < start_time + observing_timeout:
# anytime new data comes it may change status of observer
if not net_drop_found and net_down_detector.done():
net_drop_found = True
net_down_time = net_down_detector.result()
timestamp = time.strftime("%H:%M:%S",
time.localtime(net_down_time))
logger.debug('Network {} is down from {}'.format(
ping_ip, timestamp))
# 3. virtually "stop" that observer
moler_conn.unsubscribe(net_down_detector.data_received)
# 4. and start subsequent one (to know when net is back "up")
info = '{} on {} using {}'.format(ping_ip, conn_addr,
net_up_detector)
logger.debug('observe ' + info)
moler_conn.subscribe(net_up_detector.data_received)
if net_up_detector.done():
net_up_time = net_up_detector.result()
timestamp = time.strftime("%H:%M:%S",
time.localtime(net_up_time))
logger.debug('Network {} is back "up" from {}'.format(
ping_ip, timestamp))
# 5. virtually "stop" that observer
moler_conn.unsubscribe(net_up_detector.data_received)
break
time.sleep(0.2)
