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# Simple test of a UDP server and client transferring data
import socket
NUM_NEW_SOCKETS = 4
NUM_TRANSFERS = 10
TOTAL_PACKETS = NUM_NEW_SOCKETS * NUM_TRANSFERS
# If more than 75% of packets are lost, the test fails.
PACKET_LOSS_THRESH = 0.75 * TOTAL_PACKETS
PORT = 8000
def print_stats(seq):
if (TOTAL_PACKETS - seq) > PACKET_LOSS_THRESH:
print(
"packet loss %.1f%% %d/%d"
% (((TOTAL_PACKETS - seq) / TOTAL_PACKETS * 100), seq, TOTAL_PACKETS)
)
else:
print("pass")
# Server
def instance0():
seq = 0
multitest.globals(IP=multitest.get_network_ip())
multitest.next()
for i in range(NUM_NEW_SOCKETS):
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(socket.getaddrinfo("0.0.0.0", PORT + i)[0][-1])
s.settimeout(0.250)
multitest.broadcast("server ready")
for j in range(NUM_TRANSFERS):
try:
data, addr = s.recvfrom(1000)
except:
continue
if int(data) == seq:
if seq < (TOTAL_PACKETS - PACKET_LOSS_THRESH):
print(seq)
seq += 1
s.sendto(b"%d" % (seq), addr)
s.close()
print_stats(seq)
# Client
def instance1():
seq = 0
multitest.next()
for i in range(NUM_NEW_SOCKETS):
ai = socket.getaddrinfo(IP, PORT + i)[0][-1]
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.settimeout(0.250)
multitest.wait("server ready")
for j in range(NUM_TRANSFERS):
s.sendto(b"%d" % (seq), ai)
try:
data, addr = s.recvfrom(1000)
except:
continue
if int(data) == seq + 1:
if seq < (TOTAL_PACKETS - PACKET_LOSS_THRESH):
print(seq)
seq += 1
s.close()
print_stats(seq)
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