def workflow(topic, device, sensors, files=None, channel=None,
replay=None, cache=None, dbus_bus=None):
interval = 1
scheduler = n23.Scheduler(interval)
dlog = None
if files:
fout = h5py.File(next(files), 'w')
dlog = n23.DLog(fout, interval, n_chunk=60, debug=True)
scheduler.debug = dlog
scheduler.add_observer(dlog.notify)
items = sensor_replay(replay, sensors) if replay \
else sensor_tag(dbus_bus, device, sensors)
for name, read in items:
if dlog:
shape = ()
if name == 'accelerometer':
shape += (3,)
dlog.add(name, shape=shape)
@n23.coroutine
def calc(callback):
import math
while True:
item = yield
value = math.sqrt(sum(v ** 2 for v in item.value))
item = item._replace(value=value)
callback(item)
pt = calc(topic.put_nowait) if name == 'accelerometer' else topic.put_nowait
consume = n23.split(pt, dlog)
scheduler.add(name, read, consume)
tasks = [scheduler]
if channel:
p = publish(topic, channel)
tasks.append(p)
logger.info('publish data to redis channel {}'.format(channel))
if cache:
t = cache_data(topic.get, cache)
tasks.append(t)
try:
yield asyncio.gather(*tasks)
finally:
scheduler.close()
dlog.close()
fout.close()
def workflow(topic, device, files=None, channel=None, replay=None):
scheduler = n23.Scheduler(1, timeout=0.25)
fout = next(files) if files else None
if replay:
logger.info('replaying a data file {}'.format(replay))
fin = h5py.File(replay)
# for each sensor
names = ['light', 'humidity']
for name in names:
data_log = n23.data_logger(fout, name, 60) if fout else None
consume = n23.split(topic.put_nowait, data_log)
scheduler.add(name, replay_file(fin, name), consume)
else:
raise ValueError('Reading from a device not supported yet')
tasks = [scheduler()]
if channel:
p = publish(topic, channel)
tasks.append(p)
logger.info('publish data to redis channel {}'.format(channel))
return asyncio.gather(*tasks)
