def __init__(self, on_update=None):
'''
Constructor
@param on_update:()→void Called when a new line is available
'''
def noop():
pass
self.on_update = noop if on_update is None else on_update
(self.master, self.slave) = os.openpty()
self.__reader = LineReader(self.master)
self.__condition = threading.Condition()
self.__queue = []
def background():
try:
while True:
got = self.__reader.next()
if got is None:
return
self.__condition.acquire()
try:
self.__queue.append(got)
finally:
self.__condition.release()
self.on_update()
except:
return
self.__thread = threading.Thread(target=background)
self.__thread.setDaemon(True)
self.__thread.start()
def start(self):
with LineReader(spawn(*command)) as reader:
reader.next()
while True:
line = reader.next()
self.semaphore.acquire()
try:
line = line.replace('=', ' ').split(' ')
icmp_seq = int(line[line.index('icmp_seq') + 1])
ping_time = float(line[line.index('time') + 1])
ping_time *= Ping.UNITS[line[line.index('time') + 2]]
dropped_pkgs = icmp_seq - self.last_icmp_seq - 1
dropped_pkgs = [None] * dropped_pkgs
self.last_icmp_seq = icmp_seq
self.latency_buffer[:] = ([ping_time] + dropped_pkgs + self.latency_buffer)[:buffer_size]
self.last_read = time.monotonic()
except:
pass
finally:
self.semaphore.release()
def start():
with LineReader(spawn(*command)) as reader:
while True:
callback(reader.next())
