def derivative_calculator(in_q, out_q, out_topic, nskip):
logger = Logger(out_q)
try:
logger.log(__name__ + ' started')
result = 0.0
in_msg = in_q.get()
last_value, last_t = in_msg.data, time()
logger.log(__name__ + ' entering main loop')
while True:
in_msg = in_q.get()
new_value, new_t = in_msg.data, time()
result = (new_value - last_value) / (new_t - last_t)
last_value, last_t = new_value, new_t
out_msg = Message(out_topic, round(result, 2))
out_q.put(out_msg)
for n in range(nskip):
in_q.get()
out_q.put(out_msg)
except:
logger.log(format_current_exception(__name__))
def linreg_calculator(in_q, out_q, out_topic, buffer_size):
logger = Logger(out_q)
try:
logger.log(__name__ + ' started')
X = np.zeros(shape=(buffer_size, 1), dtype=np.double)
y = np.zeros(shape=(buffer_size, 1), dtype=np.double)
linregr = LinearRegression()
for i in range(buffer_size):
in_msg = in_q.get()
X[i, 0] = in_msg.timestamp
y[i, 0] = in_msg.data
logger.log(__name__ + ' entering main loop')
while True:
X = np.roll(X, -1)
y = np.roll(y, -1)
in_msg = in_q.get()
X[buffer_size - 1, 0] = in_msg.timestamp
y[buffer_size - 1, 0] = in_msg.data
linregr.fit(X, y)
out_msg = Message(out_topic, round(linregr.coef_[0, 0], 2))
out_q.put(out_msg)
except:
logger.log(format_current_exception(__name__))
def file_reader(out_q, out_topic, filename, sep, field, interval):
logger = Logger(out_q)
try:
logger.log(__name__ + ' started')
with open(filename, 'r') as f:
logger.log(__name__ + ' entering main loop')
while True:
for line in f:
tokens = line.split(sep)
out_msg = Message(out_topic, float(tokens[field]))
out_q.put(out_msg)
sleep(interval)
except:
logger.log(format_current_exception(__name__))
def MPL3115A2_reader(initial_altitude, out_q, out_topic, interval):
logger = Logger(out_q)
try:
logger.log(__name__ + ' started')
sensor = MPL3115A2()
sensor.set_altitude(initial_altitude)
logger.log(__name__ + ' entering main loop')
while True:
altitude = sensor.read_altitude()
msg = Message(out_topic, altitude)
out_q.put(msg)
sleep(interval)
except:
logger.log(format_current_exception(__name__))
def pubsub_manager(in_q, topics, out_q):
logger = Logger(out_q)
try:
logger.log(__name__ + ' started')
indexes = {}
for t in topics:
indexes[t] = 0
logger.log(__name__ + ' entering main loop')
while True:
in_msg = in_q.get()
t, data, timestamp = in_msg.topic, in_msg.data, in_msg.timestamp
if t in topics:
tag = '{0}.{1}'.format(topics[t].tag, indexes[t])
out_msg = Message(t, data, tag, timestamp)
indexes[t] += 1
for q in topics[t].subscriptions:
q.put(out_msg)
except:
logger.log(format_current_exception(__name__))
def log(self, s):
self.__q.put(Message(LOGS_TOPIC, s))