177 lines
4.5 KiB
Python
177 lines
4.5 KiB
Python
#!/usr/bin/env python
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"""USAGE: loopback.py [options]
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Options:
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--bind=S address of server to connect (default: any)
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--port=N serial port, a number or a device name (defualt: 8888)
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--sndbuf=N SO_SNDBUF override (default: no override)
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--rcvbuf=N SO_RCVBUF override (default: no override)
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--nodelay enable TCP_NODELAY
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--msg=S message content (default: 'message')
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--qty=N amount of messsages (default: 10)
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--sleep=F delay between sending messages (default: 1.0)
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--freq=N messages per second (inverse of sleep) (default: 1)
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This is a pseudo-server that sends predefined pattern to any connected client.
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It is used to test transport behaviour and throughput.
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Author: Volodymyr Shymanskyy
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License: The MIT license
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"""
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import select, socket, struct
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import os, sys, time, getopt
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from threading import Thread
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# Configuration options
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# Parse command line options
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try:
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opts, args = getopt.getopt(sys.argv[1:],
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"hb:p:",
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["help", "bind=", "port=", "sndbuf=", "rcvbuf=", "nodelay", "sleep=", "qty=", "freq=", "msg=", "dump"])
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except getopt.GetoptError:
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print >>sys.stderr, __doc__
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sys.exit(2)
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# Default options
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HOST = '' # Bind to all interfaces
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PORT = 8888 # Bind to port 8888
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NODELAY = 0 # No TCP_NODELAY
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SNDBUF = 0 # No SNDBUF override
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RCVBUF = 0 # No RCVBUF override
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MSG_QTY = 10 # Amount of messages
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SLEEP = 1.0 # Wait some time between IO
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MSG = "message" # Message
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DUMP = 0
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for o, v in opts:
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if o in ("-h", "--help"):
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print __doc__
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sys.exit()
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elif o in ("-b", "--bind"):
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HOST = v
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elif o in ("-p", "--port"):
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PORT = int(v)
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elif o in ("--sndbuf",):
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SNDBUF = int(v)
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elif o in ("--rcvbuf",):
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RCVBUF = int(v)
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elif o in ("--nodelay",):
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NODELAY = 1
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elif o in ("--sleep",):
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SLEEP = float(v)
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elif o in ("--freq",):
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SLEEP = 1.0/float(v)
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elif o in ("--qty",):
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MSG_QTY = int(v)
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elif o in ("--msg",):
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MSG = v
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elif o in ("--dump",):
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DUMP = 1
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# Print utilities
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start_time = time.time()
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def log(msg):
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print "[{:7.3f}] {:}".format(float(time.time() - start_time), msg)
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draw_col = 0
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def draw(c):
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global draw_col
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if not DUMP:
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sys.stdout.write(c)
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draw_col = (draw_col + 1) % 120
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if draw_col:
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sys.stdout.flush()
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else:
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sys.stdout.write("\n")
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def dump(msg):
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if DUMP:
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log(msg)
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def receive(sock, length):
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d = []
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l = 0
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while l < length:
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r = sock.recv(length-l)
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if not r:
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return ''
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d.append(r)
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l += len(r)
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return ''.join(d)
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# Threads
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def readthread(conn, addr):
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global msgs_in
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while(msgs_in < MSG_QTY):
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data = receive(conn, len(MSG))
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if data != MSG:
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log("Data is wrong:" + data)
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#break
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draw('v')
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dump("> " + data)
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msgs_in += 1
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def writethread(conn, addr):
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global msgs_out
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while (msgs_out < MSG_QTY):
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conn.sendall(MSG)
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draw('.')
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dump("< " + MSG)
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msgs_out += 1
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time.sleep(SLEEP)
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# Main code
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serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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try:
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# Set SO_REUSEADDR, this is needed to ignore WAIT state on next run
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serv.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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serv.bind((HOST, PORT))
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except socket.error as msg:
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log('Bind failed. Error Code: {0}, Msg: {1}'.format(str(msg[0]), msg[1]))
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sys.exit()
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serv.listen(1)
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log('Listening on port %d' % PORT)
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# Wait for clients
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#while True:
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conn, addr = serv.accept()
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log('Connection from {0}:{1}'.format(addr[0], str(addr[1])))
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if NODELAY != 0:
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conn.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
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if SNDBUF != 0:
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sndbuf = conn.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)
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log('Default SNDBUF %s changed to %s' % (sndbuf, SNDBUF))
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conn.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, SNDBUF)
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if RCVBUF != 0:
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rcvbuf = conn.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
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log('Default RCVBUF %s changed to %s' % (rcvbuf, RCVBUF))
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conn.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, RCVBUF)
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proc_start = time.time()
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msgs_in = 0
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msgs_out = 0
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wt = Thread(target=readthread, args=(conn, addr))
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rt = Thread(target=writethread, args=(conn, addr))
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wt.start()
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rt.start()
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wt.join()
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rt.join()
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draw("\n")
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log("Time %3.4f" % (time.time() - proc_start))
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log("Sent {0} messages".format(msgs_out))
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log("Recv {0} messages".format(msgs_in))
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conn.close()
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