def __init__(self):
"""
Initialize main controller
"""
self.running = False
# Create pipes for message passing between spec_proc and net_proc
fds_pass, self.fds = Pipe()
fdn_pass, self.fdn = Pipe()
# Make file descriptors non-blocking
setblocking(self.fds, 0)
setblocking(self.fdn, 0)
# Create and start child processes
self.s = SpecProc(fds_pass)
self.n = NetProc(fdn_pass)
self.s.start()
self.n.start()
# Close unused file descriptors
# The child processes inherits *all* parent descriptors (FIXME)
fds_pass.close()
fdn_pass.close()
class Burn:
def __init__(self):
"""
Initialize main controller
"""
self.running = False
# Create pipes for message passing between spec_proc and net_proc
fds_pass, self.fds = Pipe()
fdn_pass, self.fdn = Pipe()
# Make file descriptors non-blocking
setblocking(self.fds, 0)
setblocking(self.fdn, 0)
# Create and start child processes
self.s = SpecProc(fds_pass)
self.n = NetProc(fdn_pass)
self.s.start()
self.n.start()
# Close unused file descriptors
# The child processes inherits *all* parent descriptors (FIXME)
fds_pass.close()
fdn_pass.close()
def run(self):
"""
Entry point for the main controller
"""
self.running = True
# Prepare file descriptors for selection
inputs = [self.fdn, self.fds]
# Main event loop
while self.running:
readable, _, _ = select.select(inputs, [], [])
# Process readable file descriptors
for s in readable:
msg = s.recv()
if s is self.fdn: # Message received from network
self.dispatch_net_msg(msg) # Handle network message
elif s is self.fds: # Message received from spectrometer
self.dispatch_spec_msg(msg) # Handle spectrometer message
def dispatch_net_msg(self, msg):
"""
Function to handle messages from the network
"""
if not msg:
return
if msg.command == "ping":
msg.command = "ping_ok"
self.fdn.send(msg)
elif msg.command == "close":
# Ground control has requested a close down
self.fds.send(msg) # Notify spectrometer
msg.command = "close_ok" # Convert the message to a response
self.fdn.send(msg) # Notify network process and ground control
self.running = False
elif msg.command == "new_session" or msg.command == "stop_session" or msg.command == "set_gain":
self.fds.send(msg) # No housekeeping necessary, pass directly to spectrometer
else:
# Unknown command received from network
logging.warning("ctrl: unknown command: " + msg.command)
def dispatch_spec_msg(self, msg):
# Message received from spectrometer, pass on to network
self.fdn.send(msg)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
# Main controller destructor, cleaning up
self.fds.close()
self.fdn.close()
self.s.join()
self.n.join()
logging.info("ctrl: terminating")