from queue import Queue
from io import StringIO
from threading import Lock

# read/write with a threadsafe Queue
def write_queue(q, text):
    q.put(text)

def read_queue(q):
    buf = []
    while not q.empty():
        buf.append(q.get())
    return ''.join(buf)

# read/write with StringIO

def write_io(buf, text):
    buf.write(text)

def read_io(buf):
    return buf.getvalue()

# read/write with StringIO and locking
def write_io_lock(buf, text, lock):
    with lock:
        buf.write(text)

def read_io_lock(buf, lock):
    with lock:
        return buf.getvalue()

def run_test(write, read, n_writes, msg_size):
    """Run a test with a given read/write pair
    
    n_writes of size msg_size are performed.
    """
    msg = 'x' * msg_size
    for i in range(n_writes):
        write(msg)
    return read()

from functools import partial

def test_queue(n_writes, msg_size):
    q = Queue()
    write = partial(write_queue, q)
    read = partial(read_queue, q)
    return run_test(write, read, n_writes, msg_size)

def test_io(n_writes, msg_size):
    buf = StringIO()
    write = partial(write_io, buf)
    read = partial(read_io, buf)
    return run_test(write, read, n_writes, msg_size)

def test_io_lock(n_writes, msg_size):
    buf = StringIO()
    lock = Lock()
    write = partial(write_io_lock, buf, lock=lock)
    read = partial(read_io_lock, buf, lock=lock)
    return run_test(write, read, n_writes, msg_size)