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- from __future__ import annotations
-
- import argparse
- import os
- import signal
- import sys
- import threading
-
-
- try:
- import readline # noqa: F401
- except ImportError: # Windows has no `readline` normally
- pass
-
- from .sync.client import ClientConnection, connect
- from .version import version as websockets_version
-
-
- if sys.platform == "win32":
-
- def win_enable_vt100() -> None:
- """
- Enable VT-100 for console output on Windows.
-
- See also https://bugs.python.org/issue29059.
-
- """
- import ctypes
-
- STD_OUTPUT_HANDLE = ctypes.c_uint(-11)
- INVALID_HANDLE_VALUE = ctypes.c_uint(-1)
- ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x004
-
- handle = ctypes.windll.kernel32.GetStdHandle(STD_OUTPUT_HANDLE)
- if handle == INVALID_HANDLE_VALUE:
- raise RuntimeError("unable to obtain stdout handle")
-
- cur_mode = ctypes.c_uint()
- if ctypes.windll.kernel32.GetConsoleMode(handle, ctypes.byref(cur_mode)) == 0:
- raise RuntimeError("unable to query current console mode")
-
- # ctypes ints lack support for the required bit-OR operation.
- # Temporarily convert to Py int, do the OR and convert back.
- py_int_mode = int.from_bytes(cur_mode, sys.byteorder)
- new_mode = ctypes.c_uint(py_int_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
-
- if ctypes.windll.kernel32.SetConsoleMode(handle, new_mode) == 0:
- raise RuntimeError("unable to set console mode")
-
-
- def print_during_input(string: str) -> None:
- sys.stdout.write(
- # Save cursor position
- "\N{ESC}7"
- # Add a new line
- "\N{LINE FEED}"
- # Move cursor up
- "\N{ESC}[A"
- # Insert blank line, scroll last line down
- "\N{ESC}[L"
- # Print string in the inserted blank line
- f"{string}\N{LINE FEED}"
- # Restore cursor position
- "\N{ESC}8"
- # Move cursor down
- "\N{ESC}[B"
- )
- sys.stdout.flush()
-
-
- def print_over_input(string: str) -> None:
- sys.stdout.write(
- # Move cursor to beginning of line
- "\N{CARRIAGE RETURN}"
- # Delete current line
- "\N{ESC}[K"
- # Print string
- f"{string}\N{LINE FEED}"
- )
- sys.stdout.flush()
-
-
- def print_incoming_messages(websocket: ClientConnection, stop: threading.Event) -> None:
- for message in websocket:
- if isinstance(message, str):
- print_during_input("< " + message)
- else:
- print_during_input("< (binary) " + message.hex())
- if not stop.is_set():
- # When the server closes the connection, raise KeyboardInterrupt
- # in the main thread to exit the program.
- if sys.platform == "win32":
- ctrl_c = signal.CTRL_C_EVENT
- else:
- ctrl_c = signal.SIGINT
- os.kill(os.getpid(), ctrl_c)
-
-
- def main() -> None:
- # Parse command line arguments.
- parser = argparse.ArgumentParser(
- prog="python -m websockets",
- description="Interactive WebSocket client.",
- add_help=False,
- )
- group = parser.add_mutually_exclusive_group()
- group.add_argument("--version", action="store_true")
- group.add_argument("uri", metavar="<uri>", nargs="?")
- args = parser.parse_args()
-
- if args.version:
- print(f"websockets {websockets_version}")
- return
-
- if args.uri is None:
- parser.error("the following arguments are required: <uri>")
-
- # If we're on Windows, enable VT100 terminal support.
- if sys.platform == "win32":
- try:
- win_enable_vt100()
- except RuntimeError as exc:
- sys.stderr.write(
- f"Unable to set terminal to VT100 mode. This is only "
- f"supported since Win10 anniversary update. Expect "
- f"weird symbols on the terminal.\nError: {exc}\n"
- )
- sys.stderr.flush()
-
- try:
- websocket = connect(args.uri)
- except Exception as exc:
- print(f"Failed to connect to {args.uri}: {exc}.")
- sys.exit(1)
- else:
- print(f"Connected to {args.uri}.")
-
- stop = threading.Event()
-
- # Start the thread that reads messages from the connection.
- thread = threading.Thread(target=print_incoming_messages, args=(websocket, stop))
- thread.start()
-
- # Read from stdin in the main thread in order to receive signals.
- try:
- while True:
- # Since there's no size limit, put_nowait is identical to put.
- message = input("> ")
- websocket.send(message)
- except (KeyboardInterrupt, EOFError): # ^C, ^D
- stop.set()
- websocket.close()
- print_over_input("Connection closed.")
-
- thread.join()
-
-
- if __name__ == "__main__":
- main()
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