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# Copyright (c) 2012 Nicira, Inc.
#
# 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 copy
import errno
import os
import sys
import ovs.dirs
import ovs.jsonrpc
import ovs.stream
import ovs.unixctl
import ovs.util
import ovs.version
import ovs.vlog
Message = ovs.jsonrpc.Message
vlog = ovs.vlog.Vlog("unixctl_server")
class UnixctlConnection(object):
def __init__(self, rpc):
assert isinstance(rpc, ovs.jsonrpc.Connection)
self._rpc = rpc
self._request_id = None
def run(self):
self._rpc.run()
error = self._rpc.get_status()
if error or self._rpc.get_backlog():
return error
for _ in range(10):
if error or self._request_id:
break
error, msg = self._rpc.recv()
if msg:
if msg.type == Message.T_REQUEST:
self._process_command(msg)
else:
# XXX: rate-limit
vlog.warn("%s: received unexpected %s message"
% (self._rpc.name,
Message.type_to_string(msg.type)))
error = errno.EINVAL
if not error:
error = self._rpc.get_status()
return error
def reply(self, body):
self._reply_impl(True, body)
def reply_error(self, body):
self._reply_impl(False, body)
# Called only by unixctl classes.
def _close(self):
self._rpc.close()
self._request_id = None
def _wait(self, poller):
self._rpc.wait(poller)
if not self._rpc.get_backlog():
self._rpc.recv_wait(poller)
def _reply_impl(self, success, body):
assert isinstance(success, bool)
assert body is None or isinstance(body, str)
assert self._request_id is not None
if body is None:
body = ""
if body and not body.endswith("\n"):
body += "\n"
if success:
reply = Message.create_reply(body, self._request_id)
else:
reply = Message.create_error(body, self._request_id)
self._rpc.send(reply)
self._request_id = None
def _process_command(self, request):
assert isinstance(request, ovs.jsonrpc.Message)
assert request.type == ovs.jsonrpc.Message.T_REQUEST
self._request_id = request.id
error = None
params = request.params
method = request.method
command = ovs.unixctl.commands.get(method)
if command is None:
error = '"%s" is not a valid command' % method
elif len(params) < command.min_args:
error = '"%s" command requires at least %d arguments' \
% (method, command.min_args)
elif len(params) > command.max_args:
error = '"%s" command takes at most %d arguments' \
% (method, command.max_args)
else:
for param in params:
if not isinstance(param, str):
error = '"%s" command has non-string argument' % method
break
if error is None:
unicode_params = [str(p) for p in params]
command.callback(self, unicode_params, command.aux)
if error:
self.reply_error(error)
def _unixctl_version(conn, unused_argv, version):
assert isinstance(conn, UnixctlConnection)
version = "%s (Open vSwitch) %s" % (ovs.util.PROGRAM_NAME, version)
conn.reply(version)
class UnixctlServer(object):
def __init__(self, listener):
assert isinstance(listener, ovs.stream.PassiveStream)
self._listener = listener
self._conns = []
def run(self):
for _ in range(10):
error, stream = self._listener.accept()
if sys.platform == "win32" and error == errno.WSAEWOULDBLOCK:
# WSAEWOULDBLOCK would be the equivalent on Windows
# for EAGAIN on Unix.
error = errno.EAGAIN
if not error:
rpc = ovs.jsonrpc.Connection(stream)
self._conns.append(UnixctlConnection(rpc))
elif error == errno.EAGAIN:
break
else:
# XXX: rate-limit
vlog.warn("%s: accept failed: %s" % (self._listener.name,
os.strerror(error)))
for conn in copy.copy(self._conns):
error = conn.run()
if error and error != errno.EAGAIN:
conn._close()
self._conns.remove(conn)
def wait(self, poller):
self._listener.wait(poller)
for conn in self._conns:
conn._wait(poller)
def close(self):
for conn in self._conns:
conn._close()
self._conns = None
self._listener.close()
self._listener = None
@staticmethod
def create(path, version=None):
"""Creates a new UnixctlServer which listens on a unixctl socket
created at 'path'. If 'path' is None, the default path is chosen.
'version' contains the version of the server as reported by the unixctl
version command. If None, ovs.version.VERSION is used."""
assert path is None or isinstance(path, str)
if path is not None:
path = "punix:%s" % ovs.util.abs_file_name(ovs.dirs.RUNDIR, path)
else:
if sys.platform == "win32":
path = "punix:%s/%s.ctl" % (ovs.dirs.RUNDIR,
ovs.util.PROGRAM_NAME)
else:
path = "punix:%s/%s.%d.ctl" % (ovs.dirs.RUNDIR,
ovs.util.PROGRAM_NAME,
os.getpid())
if version is None:
version = ovs.version.VERSION
error, listener = ovs.stream.PassiveStream.open(path)
if error:
ovs.util.ovs_error(error, "could not initialize control socket %s"
% path)
return error, None
ovs.unixctl.command_register("version", "", 0, 0, _unixctl_version,
version)
return 0, UnixctlServer(listener)
class UnixctlClient(object):
def __init__(self, conn):
assert isinstance(conn, ovs.jsonrpc.Connection)
self._conn = conn
def transact(self, command, argv):
assert isinstance(command, str)
assert isinstance(argv, list)
for arg in argv:
assert isinstance(arg, str)
request = Message.create_request(command, argv)
error, reply = self._conn.transact_block(request)
if error:
vlog.warn("error communicating with %s: %s"
% (self._conn.name, os.strerror(error)))
return error, None, None
if reply.error is not None:
return 0, str(reply.error), None
else:
assert reply.result is not None
return 0, None, str(reply.result)
def close(self):
self._conn.close()
self.conn = None
@staticmethod
def create(path):
assert isinstance(path, str)
unix = "unix:%s" % ovs.util.abs_file_name(ovs.dirs.RUNDIR, path)
error, stream = ovs.stream.Stream.open_block(
ovs.stream.Stream.open(unix))
if error:
vlog.warn("failed to connect to %s" % path)
return error, None
return 0, UnixctlClient(ovs.jsonrpc.Connection(stream))