If I assign output to variable there is a JSON decode error.

[machoog546]

When running the code below if I don't assign the client.run() to a variable it will print to screen like normal. If I assign to a variable to parse it/print later I get the below error.

import iperf3, time, threading

def client():
    
    print("starting client")
    client = iperf3.Client()
    client.Duration = 4
    client.bind_address="192.168.200.10"
    client.server_hostname='192.168.200.20'
    client.port=6969
    time.sleep(2) #used to make sure server is up and ready
    result = client.run()
    #print(type(result))

    return result

    


def server():
	server = iperf3.Server()
	server.bind_address='192.168.200.20'
	server.port=6969
	print("starting server")
	server.run()
	print("server done")
    #if you see the server stating and ending quickly. the ip/port is already bound?


c = threading.Thread(target=client)
t = threading.Thread(target=server)
t.setDaemon=True

t.start()
c.start()

Error:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.5/threading.py", line 914, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.5/threading.py", line 862, in run
    self._target(*self._args, **self._kwargs)
  File "iperf3Client.py", line 12, in client
    result = client.run()
  File "/usr/local/lib/python3.5/dist-packages/iperf3/iperf3.py", line 617, in run
    return TestResult(data)
  File "/usr/local/lib/python3.5/dist-packages/iperf3/iperf3.py", line 768, in __init__
    self.json = json.loads(result)
  File "/usr/lib/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.5/json/decoder.py", line 342, in decode
    raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 310 column 1 (char 6530)

Could it be it's seeing an extra character at the start of the list when it does the JSON formatting and it errors out? I know just enough about the JSON to get myself in trouble.

I also changed my json_output=False like in #38 but that causes it to hang. Was hoping for the NoneType, or for something different, but it wasn't the different I was expecting.

Linux machoog546-virtual-machine 4.10.0-38-generic #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

[machoog546]

Side thing I just tried. If I run both functions as their own scripts it prints out with no error. Might be threading related?

[machoog546]

After some more tinkering I changed multi threading to multi processing in a test VM and it worked. Still not sure why it had the issue in the first place.

import iperf3, time
import multiprocessing as mp

def client_side(cli, serv, port, YesNo):

if YesNo:
	f = open("port_" + str(port) + ".txt", "w+")

traffic=iperf3.Client()
traffic.duration=90
traffic.bind_address=cli
traffic.server_hostname = serv
traffic.port=port
traffic.bandwidth = 180000000
result = traffic.run()
time.sleep(2)
	
if YesNo:
	result = str(result)
	time.sleep(1)
	
	f.write(result)
	f.close() #Not needed but i want to make sure it saves

clients = [6969, 6970,6971,6971] #not needed. can be put in the args space of the MP call

threads =[]
print("starting")
c1 = mp.Process(target=client_side, args=("192.168.201.10", "192.168.201.20", clients[0], True,))#, daemon = True)
threads.append(c1)
c2 = mp.Process(target=client_side, args=("192.168.202.10", "192.168.202.20", clients[1], True,))#, daemon = True)
threads.append(c2)
c3 = mp.Process(target=client_side, args=("192.168.203.10", "192.168.203.20", clients[2], True,))#, daemon = True)
threads.append(c3)
c4 = mp.Process(target=client_side, args=("192.168.204.10", "192.168.204.20", clients[3], True,))#, daemon = True)
threads.append(c4)

print(threads)
for thread in threads:
print("Starting " + str(thread))
thread.start()
time.sleep(2)

for thread in threads:

thread.join()
time.sleep(1)

print("Complete")