def send(self, session, params=None):
"""send(dest)
**Process** - Process for sending outgoing G3Frames. This will query
the out_queue for frames to be sent to lyrebird. This will try to
regulate how fast it sends frames such that the delay between when the
frames are sent, and the timestamp of the frames are fixed.
"""
self._send_running = True
first_frame_time = None
stream_start_time = None
sender = core.G3NetworkSender(hostname='*',
port=params['dest'],
max_queue_size=1000)
sender.Process(self.fp.config_frame())
session.set_status('running')
while session.status in ['starting', 'running']:
f = self.out_queue.get(block=True)
t = f['timestamp'].time / core.G3Units.s
now = time.time()
if first_frame_time is None:
first_frame_time = t
stream_start_time = now
this_frame_time = stream_start_time + (
t - first_frame_time) + self.delay
res = sleep_while_running(this_frame_time - now, session)
sender.Process(f)
return True, "Stopped send process"
def __init__(self, agent, port=4536, num_chans=528):
"""
OCS Agent to simulate data streaming without connection to a smurf.
"""
self.agent = agent
self.log = agent.log
self.port = port
self.writer = core.G3NetworkSender(hostname="*", port=self.port)
self.is_streaming = False
self.channels = [StreamChannel(0, 1) for i in range(num_chans)]
def __init__(self, agent, port=4536):
"""
OCS Agent to simulate data streaming without connection to a smurf.
"""
self.port = port
self.agent = agent
self.log = agent.log
self.is_streaming = False
self.freq = 100 # [Hz]
self.writer = core.G3NetworkSender(hostname="*", port=self.port)
# This does not close the port when streaming stops!
# Only when the agent is quit!
self.keys = ["{}".format(i) for i in range(4096)]
self.channels = {
k: {
'type': 'const',
'val': 0,
'stdev': 0.05,
}
for k in self.keys
}
def start_background_streamer(self, session, params=None):
"""start_background_streamer(params=None)
Process to run streaming process. A data stream is started
automatically. It can be stopped and started by the start and stop
tasks. Either way keep alive flow control frames are being sent.
Parameters
----------
frame_rate : float, optional
Frequency [Hz] at which G3Frames are sent over the network.
Defaults to 1 frame pers sec.
sample_rate : float, optional
Sample rate [Hz] for each channel. Defaults to 10 Hz.
"""
if params is None:
params = {}
self.writer = core.G3NetworkSender(hostname=self.target_host,
port=self.port)
frame_rate = params.get('frame_rate', 1.)
sample_rate = params.get('sample_rate', 10.)
frame_num = 0
self.running_in_background = True
# Control flags FIFO stack to keep Writer single threaded
self.flags = deque([FlowControl.START])
while self.running_in_background:
# Send START frame
if next(iter(self.flags), None) is FlowControl.START:
self._set_stream_on() # sends start flowcontrol
self.is_streaming = True
self.flags.popleft()
print("stream running in background")
self.log.debug("control flags: {f}", f=self.flags)
# Send keep alive flow control frame
f = core.G3Frame(core.G3FrameType.none)
f['sostream_flowcontrol'] = FlowControl.ALIVE.value
self.writer.Process(f)
if self.is_streaming:
frame_start = time.time()
time.sleep(1. / frame_rate)
frame_stop = time.time()
times = np.arange(frame_start, frame_stop, 1. / sample_rate)
f = core.G3Frame(core.G3FrameType.Scan)
f['session_id'] = 0
f['frame_num'] = frame_num
f['sostream_id'] = self.stream_id
f['data'] = core.G3TimestreamMap()
for i, chan in enumerate(self.channels):
ts = core.G3Timestream([chan.read() for t in times])
ts.start = core.G3Time(frame_start * core.G3Units.sec)
ts.stop = core.G3Time(frame_stop * core.G3Units.sec)
f['data'][f"r{i:04}"] = ts
self.writer.Process(f)
self.log.info("Writing frame...")
frame_num += 1
# Send END frame
if next(iter(self.flags), None) is FlowControl.END:
self._send_end_flowcontrol_frame()
self._send_cleanse_flowcontrol_frame()
self.is_streaming = False
self.flags.popleft()
else:
# Don't send keep alive frames too quickly
time.sleep(1)
# Shutdown streamer
if next(iter(self.flags), None) is SHUTDOWN:
self.running_in_background = False
self.flags.popleft()
# Teardown writer
self.writer.Close()
self.writer = None
return True, "Finished streaming"
def networksender():
networksender = core.G3NetworkSender(hostname="*", port=4536)
return networksender
frames = []
for i in range(0, 20):
f = core.G3Frame()
f['Sequence'] = i
f['Data'] = core.G3Timestream(numpy.zeros(100000))
frames.append(f)
print('Port: ', port)
child = os.fork()
if child != 0:
# Parent
print('Parent')
send = core.G3NetworkSender(hostname='*', port=port)
time.sleep(1) # XXX: how to signal that the remote end is ready?
print('Sending')
for f in frames:
send(f)
send(core.G3Frame(core.G3FrameType.EndProcessing))
pid, status = os.wait()
print('Child Status: ', status)
if status == 0:
print('OK')
sys.exit(status)
else:
# Child
print('Child')
