try:
    import io
    import errno
    import websocket
except ImportError:
    print("SKIP")
    raise SystemExit


# put raw data in the stream and do a websocket read
def ws_read(msg, sz):
    ws = websocket.websocket(io.BytesIO(msg))
    return ws.read(sz)


# put raw data in the stream and do a series of websocket read
def ws_readn(msg, *args):
    ws = websocket.websocket(io.BytesIO(msg))
    for sz in args:
        yield ws.read(sz)


# do a websocket write and then return the raw data from the stream
def ws_write(msg, sz):
    s = io.BytesIO()
    ws = websocket.websocket(s)
    ws.write(msg)
    s.seek(0)
    return s.read(sz)


# basic frame
print(ws_read(b"\x81\x04ping", 4))
print(ws_write(b"pong", 6))

# split frames and irregular size reads
for s in ws_readn(b"\x01\x04ping\x00\x04Ping\x80\x04PING", 6, 4, 2, 2):
    print(s)

# extended payloads
print(ws_read(b"\x81~\x00\x80" + b"ping" * 32, 128))
print(ws_write(b"pong" * 32, 132))

# 64-bit payload size, unsupported by MicroPython implementation. Framing is lost.
msg = b"\x81\x7f\x00\x00\x00\x00\x00\x00\x00\x80" + b"ping" * 32
ws = websocket.websocket(io.BytesIO(msg))
try:
    print(ws.read(1))
except OSError as e:
    print("ioctl: EIO:", e.errno == errno.EIO)

# mask (returned data will be 'maskmask' ^ 'maskMASK')
print(ws_read(b"\x81\x88maskmaskMASK", 8))
# mask w/2-byte payload len (returned data will be 'maskmask' ^ 'maskMASK')
print(ws_read(b"\x81\xfe\x00\x08maskmaskMASK", 8))

# close control frame
s = io.BytesIO(b"\x88\x00")  # FRAME_CLOSE
ws = websocket.websocket(s)
print(ws.read(1))
s.seek(2)
print(s.read(4))

# misc control frames
print(ws_read(b"\x89\x00\x81\x04ping", 4))  # FRAME_PING
print(ws_read(b"\x8a\x00\x81\x04pong", 4))  # FRAME_PONG

# close method
ws = websocket.websocket(io.BytesIO())
ws.close()

# ioctl
ws = websocket.websocket(io.BytesIO())
print(ws.ioctl(8))  # GET_DATA_OPTS
print(ws.ioctl(9, 2))  # SET_DATA_OPTS
print(ws.ioctl(9))
try:
    ws.ioctl(-1)
except OSError as e:
    print("ioctl: EINVAL:", e.errno == errno.EINVAL)