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Port tools/discover.py to py3 and lint

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Brennan Ashton 2021-04-04 16:54:09 -07:00 committed by Xiang Xiao
parent d2f922dc4d
commit 7386cc3665
1 changed files with 21 additions and 15 deletions
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36
tools/discover.py
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@ -26,58 +26,64 @@ from socket import *
PORT = 96 PORT = 96
DISCOVER_PROTO_ID = 0x99 DISCOVER_PROTO_ID = 0x99
DISCOVER_ALL = 0xff # 0xff means all devices DISCOVER_ALL = 0xFF # 0xff means all devices
DISCOVER_REQUEST = 0x01 DISCOVER_REQUEST = 0x01
DISCOVER_RESPONSE = 0x02 DISCOVER_RESPONSE = 0x02
DISCOVER_REQUEST_SIZE = 4 DISCOVER_REQUEST_SIZE = 4
DISCOVER_RESPONSE_SIZE = 35 DISCOVER_RESPONSE_SIZE = 35
def check_sum(data): def check_sum(data):
chksum = 0 chksum = 0
for c in data[:-1]: for c in data[:-1]:
chksum -= c chksum -= c
return (chksum & 0xff) == data[-1] return (chksum & 0xFF) == data[-1]
def send_discover(socket): def send_discover(socket):
cmd = array.array('B', [0] * DISCOVER_REQUEST_SIZE) cmd = array.array("B", [0] * DISCOVER_REQUEST_SIZE)
cmd[0] = DISCOVER_PROTO_ID # Tag for identification of the protocol cmd[0] = DISCOVER_PROTO_ID # Tag for identification of the protocol
cmd[1] = DISCOVER_REQUEST # Request command cmd[1] = DISCOVER_REQUEST # Request command
cmd[2] = DISCOVER_ALL cmd[2] = DISCOVER_ALL
chksum = 0 chksum = 0
for c in cmd[:3]: for c in cmd[:3]:
chksum -= c chksum -= c
cmd[3] = chksum & 0xff cmd[3] = chksum & 0xFF
socket.sendto(cmd, ("<broadcast>", PORT))
socket.sendto(cmd, ('<broadcast>', PORT))
def read_responses(socket): def read_responses(socket):
res = [] res = []
response = array.array('B', [0] * DISCOVER_RESPONSE_SIZE) response = array.array("B", [0] * DISCOVER_RESPONSE_SIZE)
try: try:
while 1: while 1:
size, src = socket.recvfrom_into(response) size, src = socket.recvfrom_into(response)
if (size == DISCOVER_RESPONSE_SIZE if (
size == DISCOVER_RESPONSE_SIZE
and response[0] == DISCOVER_PROTO_ID and response[0] == DISCOVER_PROTO_ID
and response[1] == DISCOVER_RESPONSE and response[1] == DISCOVER_RESPONSE
and check_sum(response)): and check_sum(response)
):
dev = {} dev = {}
dev['addr'] = src[0] dev["addr"] = src[0]
dev['descr'] = response[2:-1].tostring().rstrip('\0') dev["descr"] = response[2:-1].tostring().rstrip("\0")
res.append(dev) res.append(dev)
except timeout: except timeout:
return res return res
if __name__ == '__main__':
print 'Sending discover...' if __name__ == "__main__":
print("Sending discover...")
s = socket(AF_INET, SOCK_DGRAM) s = socket(AF_INET, SOCK_DGRAM)
s.bind(('0.0.0.0', PORT)) s.bind(("0.0.0.0", PORT))
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1) s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
s.settimeout(1.0) s.settimeout(1.0)
send_discover(s) send_discover(s)
devices = read_responses(s) devices = read_responses(s)
socket.close(s) socket.close(s)
print devices print(devices)