# Copied with minimal modifications from curio
# https://github.com/dabeaz/curio


import argparse
import concurrent.futures
import socket
import time


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--msize', default=1000, type=int,
                        help='message size in bytes')
    parser.add_argument('--mpr', default=1, type=int,
                        help='messages per request')
    parser.add_argument('--num', default=200000, type=int,
                        help='number of messages')
    parser.add_argument('--times', default=1, type=int,
                        help='number of times to run the test')
    parser.add_argument('--workers', default=3, type=int,
                        help='number of workers')
    parser.add_argument('--addr', default='127.0.0.1:25000', type=str,
                        help='address:port of echoserver')
    args = parser.parse_args()

    unix = False
    if args.addr.startswith('file:'):
        unix = True
        addr = args.addr[5:]
    else:
        addr = args.addr.split(':')
        addr[1] = int(addr[1])
        addr = tuple(addr)
    print('will connect to: {}'.format(addr))

    MSGSIZE = args.msize
    REQSIZE = MSGSIZE * args.mpr

    msg = b'x'*(MSGSIZE - 1) + b'\n'
    if args.mpr:
        msg *= args.mpr

    def run_test(n):
        print('Sending', NMESSAGES, 'messages')
        if args.mpr:
            n //= args.mpr

        if unix:
            sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        else:
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

        try:
            sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
        except (OSError, NameError):
            pass

        sock.connect(addr)
        while n > 0:
            sock.sendall(msg)
            nrecv = 0
            while nrecv < REQSIZE:
                resp = sock.recv(REQSIZE)
                if not resp:
                    raise SystemExit()
                nrecv += len(resp)
            n -= 1

    TIMES = args.times
    N = args.workers
    NMESSAGES = args.num
    start = time.time()
    for _ in range(TIMES):
        with concurrent.futures.ProcessPoolExecutor(max_workers=N) as e:
            for _ in range(N):
                e.submit(run_test, NMESSAGES)
    end = time.time()
    duration = end-start
    print(NMESSAGES * N * TIMES, 'in', duration)
    print(NMESSAGES * N * TIMES / duration, 'requests/sec')