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# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import atexit
import logging
import os
import pty
import tty
from bumble.transport.common import StreamPacketSink, StreamPacketSource, Transport
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_pty_transport(spec: str | None) -> Transport:
'''
Open a PTY transport.
The parameter string may be empty, or a path name where a symbolic link
to the PTY will be created (the link will be removed when the transport
is closed or when the process exits)
'''
primary, replica = pty.openpty()
replica_path = os.ttyname(replica)
logger.debug(f'pty open at {replica_path}')
tty.setraw(primary)
tty.setraw(replica)
read_transport, packet_source = await asyncio.get_running_loop().connect_read_pipe(
StreamPacketSource, open(primary, 'rb', closefd=False)
)
write_transport, _ = await asyncio.get_running_loop().connect_write_pipe(
asyncio.BaseProtocol, open(primary, 'wb', closefd=False)
)
packet_sink = StreamPacketSink(write_transport)
def cleanup():
if spec:
try:
os.unlink(spec)
except FileNotFoundError:
pass
# If required, create a symbolic link to the replica
# NOTE: the link will be removed when this process exits
if spec:
os.symlink(replica_path, spec)
logger.debug(f'linked pty at {spec}')
atexit.register(cleanup)
class PtyTransport(Transport):
async def close(self):
write_transport.close()
read_transport.close()
os.close(primary)
os.close(replica)
cleanup()
return PtyTransport(packet_source, packet_sink)
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