def listen_packets_loop():
"""Initializes the socket used to interface with the C program, and listen
for any incoming packets. When we hear one, parse it with scapy and update
the display to show information about packet.
"""
global packet
global c_socket
print 'Listening for packets...'
while True:
# Receive any packet that the C side has sent over.
print 'Sending request'
c_packet = SEASIDE.request_SEASIDE(c_socket, c_socket_lock,
SEASIDE_FLAGS.GET_PACKET.value)
if c_packet != '':
# Parse packet with scapy so we can pull it apart easier.
packet = scapy.Ether(c_packet)
num_packets_received = SEASIDE.request_SEASIDE(
c_socket, c_socket_lock, SEASIDE_FLAGS.NUM_PACKETS.value)
num_packets_received = struct.unpack('=I', num_packets_received)
update_packet_info(packet, num_packets_received)
time.sleep(2)
def update_statistics_loop():
"""Gets cpu usage and bandwidth and displays it on the LCD.
"""
global c_socket_lock
while True:
d_bytes = SEASIDE.request_SEASIDE(c_socket, c_socket_lock,
SEASIDE_FLAGS.GET_BANDWIDTH.value)
print repr(d_bytes)
d_bytes = struct.unpack('=Q', d_bytes)
d_bytes = d_bytes[0]
bw, bw_unit = conversions.convert_bandwidth_units(d_bytes)
bandwidth_output = 'Bw:%5.1f %s' % (bw, bw_unit)
thread_lcd.lock_and_display_bandwidth_LED(lcd, lcd_lock, bw, bw_unit)
screen_output[Screens.Summary.value][1] = bandwidth_output
avg_cpu_usage, per_core_cpu_usage = computations.read_cpu_usage()
screen_output[Screens.CPU.value][0] = \
'CPU Usage: %4.1f%%' % (avg_cpu_usage)
screen_output[Screens.CPU.value][1] = \
'%2.0f%% %2.0f%% %2.0f%% %2.0f%%' % tuple(per_core_cpu_usage)
time.sleep(1)
def command_and_respond(self, command, size):
"""Sends a command to the C side, and gets the response.
Some flags are used for getting info from the C side, such as getting
bandwidth, or the structure of the current packet.
Args:
command (int): The flag to send to the C side.
size (str): The size of the reponse that you're expecting. See
https://docs.python.org/2/library/struct.html for different
sizes.
Returns:
str: The response that was received, encoded in hex format. The
format looks like this: 12abc4394fa. I.e. there's no dashes or
spaces in between each byte, and no \\x or equivalent. As a
sidenote, that \\x used to have only one slash, but it threw
errors, because apparently it couldn't be parsed...
TODO: What if the value returned isn't an int? Make it more generic.
"""
temp = SEASIDE.request_SEASIDE(c_socket, c_socket_lock, int(command))
temp = struct.unpack('=' + size, temp)[0]
temp = struct.pack('!' + size, temp)
return temp.encode('hex')
def update_statistics_loop():
"""Gets cpu usage and bandwidth and displays it on the LCD.
"""
global c_socket_lock
while True:
d_bytes = SEASIDE.request_SEASIDE(c_socket, c_socket_lock,
SEASIDE_FLAGS.GET_BANDWIDTH.value)
print repr(d_bytes)
d_bytes = struct.unpack('=Q', d_bytes)
d_bytes = d_bytes[0]
bw, bw_unit = conversions.convert_bandwidth_units(d_bytes)
bandwidth_output = 'Bw:%5.1f %s' % (bw, bw_unit)
thread_lcd.lock_and_display_bandwidth_LED(
lcd, lcd_lock, bw, bw_unit)
screen_output[Screens.Summary.value][1] = bandwidth_output
avg_cpu_usage, per_core_cpu_usage = computations.read_cpu_usage()
screen_output[Screens.CPU.value][0] = \
'CPU Usage: %4.1f%%' % (avg_cpu_usage)
screen_output[Screens.CPU.value][1] = \
'%2.0f%% %2.0f%% %2.0f%% %2.0f%%' % tuple(per_core_cpu_usage)
time.sleep(1)
def listen_packets_loop():
"""Initializes the socket used to interface with the C program, and listen
for any incoming packets. When we hear one, parse it with scapy and update
the display to show information about packet.
"""
global packet
global c_socket
print 'Listening for packets...'
while True:
# Receive any packet that the C side has sent over.
print 'Sending request'
c_packet = SEASIDE.request_SEASIDE(c_socket, c_socket_lock, SEASIDE_FLAGS.GET_PACKET.value)
if c_packet != '':
# Parse packet with scapy so we can pull it apart easier.
packet = scapy.Ether(c_packet)
num_packets_received = SEASIDE.request_SEASIDE(c_socket, c_socket_lock, SEASIDE_FLAGS.NUM_PACKETS.value)
num_packets_received = struct.unpack('=I', num_packets_received)
update_packet_info(packet, num_packets_received)
time.sleep(2)
def update_statistics_loop(c_socket, c_socket_lock):
"""Update the values of bandwidth and CPU use.
Calculates bandwidth using change in bytes received over time, which is
provided by the C-side. Calculates CPU using psutil.
"""
while True:
d_bytes = SEASIDE.request_SEASIDE(c_socket, c_socket_lock,
SEASIDE_FLAGS.GET_BANDWIDTH.value)
print "D_bytes:", repr(d_bytes)
d_bytes = struct.unpack('=Q', d_bytes)
d_bytes = d_bytes[0]
bw, bw_unit = conversions.convert_bandwidth_units(d_bytes)
cpu, percore = computations.read_cpu_usage() # percore unused
screen_output[0] = 'Bw:%2.1f %s' % (bw, bw_unit)
screen_output[1] = 'CPU:%2.1f%%' % (cpu)
time.sleep(1)
def update_statistics_loop(c_socket, c_socket_lock):
"""Update the values of bandwidth and CPU use.
Calculates bandwidth using change in bytes received over time.
Calculates CPU using psutil.
"""
while True:
d_bytes = SEASIDE.request_SEASIDE(c_socket, c_socket_lock,
SEASIDE_FLAGS.GET_BANDWIDTH.value)
d_bytes = struct.unpack('=Q', d_bytes)
d_bytes = d_bytes[0]
bw, bw_unit = conversions.convert_bandwidth_units(d_bytes)
cpu, percore = computations.read_cpu_usage() # percore unused
screen_output[0] = 'Bw:%2.1f %s' % (bw, bw_unit)
screen_output[1] = 'CPU:%2.1f%%' % (cpu)
time.sleep(1)