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# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See LICENSE in the project root
# for license information.
"""Imported from test code that runs under debugpy, and allows that code
to communcate back to the test. Works in conjunction with debug_session
fixture and its backchannel method."""
__all__ = ["port", "receive", "send"]
import atexit
import os
import socket
import debuggee
from debugpy.common import log, messaging
def send(value):
_stream.write_json(value)
def receive():
return _stream.read_json()
def close():
global _socket, _stream
if _socket is None:
return
log.info("Shutting down {0}...", name)
try:
_socket.shutdown(socket.SHUT_RDWR)
except Exception:
pass
finally:
_socket = None
try:
_stream.close()
except Exception:
pass
finally:
_stream = None
class _stream:
def _error(*_):
raise AssertionError("Backchannel is not set up for this process")
read_json = write_json = _error
close = lambda: None
name = f"backchannel-{debuggee.session_id}"
port = os.environ.pop("DEBUGPY_TEST_BACKCHANNEL_PORT", None)
if port is not None:
port = int(port)
log.info("Connecting {0} to port {1}...", name, port)
_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
_socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
_socket.connect(("localhost", port))
except Exception:
_socket.close()
raise
else:
_stream = messaging.JsonIOStream.from_socket( # noqa
_socket, name="backchannel"
)
atexit.register(close)
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