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# Copyright 2016 Cloudbase Solutions Srl
# All Rights Reserved.
#
# 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
#
# http://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.
import functools
import socket
from eventlet import patcher
from nova import exception
from nova.i18n import _
from nova.virt.hyperv import constants
# Note(lpetrut): Eventlet greenpipes are not supported on Windows. The named
# pipe handlers implemented in os-win use Windows API calls which can block
# the whole thread. In order to avoid this, those workers run in separate
# 'native' threads.
#
# As this proxy communicates with those workers via queues, the serial console
# proxy workers have to run in 'native' threads as well.
threading = patcher.original('threading')
def handle_socket_errors(func):
@functools.wraps(func)
def wrapper(self, *args, **kwargs):
try:
return func(self, *args, **kwargs)
except socket.error:
self._client_connected.clear()
return wrapper
class SerialProxy(threading.Thread):
def __init__(self, instance_name, addr, port, input_queue,
output_queue, client_connected):
super(SerialProxy, self).__init__()
self.setDaemon(True)
self._instance_name = instance_name
self._addr = addr
self._port = port
self._conn = None
self._input_queue = input_queue
self._output_queue = output_queue
self._client_connected = client_connected
self._stopped = threading.Event()
def _setup_socket(self):
try:
self._sock = socket.socket(socket.AF_INET,
socket.SOCK_STREAM)
self._sock.setsockopt(socket.SOL_SOCKET,
socket.SO_REUSEADDR,
1)
self._sock.bind((self._addr, self._port))
self._sock.listen(1)
except socket.error as err:
self._sock.close()
msg = (_('Failed to initialize serial proxy on '
'%(addr)s:%(port)s, handling connections '
'to instance %(instance_name)s. Error: %(error)s') %
{'addr': self._addr,
'port': self._port,
'instance_name': self._instance_name,
'error': err})
raise exception.NovaException(msg)
def stop(self):
self._stopped.set()
self._client_connected.clear()
if self._conn:
self._conn.shutdown(socket.SHUT_RDWR)
self._conn.close()
self._sock.close()
def run(self):
self._setup_socket()
while not self._stopped.isSet():
self._accept_conn()
@handle_socket_errors
def _accept_conn(self):
self._conn, client_addr = self._sock.accept()
self._client_connected.set()
workers = []
for job in [self._get_data, self._send_data]:
worker = threading.Thread(target=job)
worker.setDaemon(True)
worker.start()
workers.append(worker)
for worker in workers:
worker_running = (worker.is_alive() and
worker is not threading.current_thread())
if worker_running:
worker.join()
self._conn.close()
self._conn = None
@handle_socket_errors
def _get_data(self):
while self._client_connected.isSet():
data = self._conn.recv(constants.SERIAL_CONSOLE_BUFFER_SIZE)
if not data:
self._client_connected.clear()
return
self._input_queue.put(data)
@handle_socket_errors
def _send_data(self):
while self._client_connected.isSet():
data = self._output_queue.get_burst()
if data:
self._conn.sendall(data)
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