248 lines
7.5 KiB
Python
248 lines
7.5 KiB
Python
# Copyright (c) 2012 Nicira, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import copy
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import errno
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import os
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import types
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import ovs.dirs
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import ovs.jsonrpc
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import ovs.stream
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import ovs.unixctl
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import ovs.util
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import ovs.version
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import ovs.vlog
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Message = ovs.jsonrpc.Message
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vlog = ovs.vlog.Vlog("unixctl_server")
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strtypes = types.StringTypes
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class UnixctlConnection(object):
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def __init__(self, rpc):
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assert isinstance(rpc, ovs.jsonrpc.Connection)
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self._rpc = rpc
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self._request_id = None
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def run(self):
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self._rpc.run()
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error = self._rpc.get_status()
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if error or self._rpc.get_backlog():
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return error
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for _ in range(10):
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if error or self._request_id:
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break
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error, msg = self._rpc.recv()
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if msg:
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if msg.type == Message.T_REQUEST:
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self._process_command(msg)
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else:
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# XXX: rate-limit
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vlog.warn("%s: received unexpected %s message"
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% (self._rpc.name,
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Message.type_to_string(msg.type)))
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error = errno.EINVAL
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if not error:
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error = self._rpc.get_status()
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return error
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def reply(self, body):
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self._reply_impl(True, body)
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def reply_error(self, body):
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self._reply_impl(False, body)
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# Called only by unixctl classes.
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def _close(self):
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self._rpc.close()
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self._request_id = None
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def _wait(self, poller):
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self._rpc.wait(poller)
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if not self._rpc.get_backlog():
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self._rpc.recv_wait(poller)
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def _reply_impl(self, success, body):
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assert isinstance(success, bool)
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assert body is None or isinstance(body, strtypes)
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assert self._request_id is not None
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if body is None:
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body = ""
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if body and not body.endswith("\n"):
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body += "\n"
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if success:
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reply = Message.create_reply(body, self._request_id)
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else:
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reply = Message.create_error(body, self._request_id)
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self._rpc.send(reply)
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self._request_id = None
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def _process_command(self, request):
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assert isinstance(request, ovs.jsonrpc.Message)
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assert request.type == ovs.jsonrpc.Message.T_REQUEST
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self._request_id = request.id
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error = None
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params = request.params
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method = request.method
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command = ovs.unixctl.commands.get(method)
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if command is None:
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error = '"%s" is not a valid command' % method
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elif len(params) < command.min_args:
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error = '"%s" command requires at least %d arguments' \
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% (method, command.min_args)
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elif len(params) > command.max_args:
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error = '"%s" command takes at most %d arguments' \
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% (method, command.max_args)
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else:
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for param in params:
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if not isinstance(param, strtypes):
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error = '"%s" command has non-string argument' % method
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break
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if error is None:
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unicode_params = [unicode(p) for p in params]
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command.callback(self, unicode_params, command.aux)
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if error:
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self.reply_error(error)
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def _unixctl_version(conn, unused_argv, version):
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assert isinstance(conn, UnixctlConnection)
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version = "%s (Open vSwitch) %s" % (ovs.util.PROGRAM_NAME, version)
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conn.reply(version)
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class UnixctlServer(object):
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def __init__(self, listener):
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assert isinstance(listener, ovs.stream.PassiveStream)
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self._listener = listener
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self._conns = []
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def run(self):
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for _ in range(10):
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error, stream = self._listener.accept()
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if not error:
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rpc = ovs.jsonrpc.Connection(stream)
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self._conns.append(UnixctlConnection(rpc))
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elif error == errno.EAGAIN:
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break
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else:
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# XXX: rate-limit
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vlog.warn("%s: accept failed: %s" % (self._listener.name,
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os.strerror(error)))
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for conn in copy.copy(self._conns):
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error = conn.run()
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if error and error != errno.EAGAIN:
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conn._close()
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self._conns.remove(conn)
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def wait(self, poller):
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self._listener.wait(poller)
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for conn in self._conns:
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conn._wait(poller)
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def close(self):
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for conn in self._conns:
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conn._close()
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self._conns = None
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self._listener.close()
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self._listener = None
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@staticmethod
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def create(path, version=None):
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"""Creates a new UnixctlServer which listens on a unixctl socket
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created at 'path'. If 'path' is None, the default path is chosen.
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'version' contains the version of the server as reported by the unixctl
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version command. If None, ovs.version.VERSION is used."""
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assert path is None or isinstance(path, strtypes)
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if path is not None:
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path = "punix:%s" % ovs.util.abs_file_name(ovs.dirs.RUNDIR, path)
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else:
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path = "punix:%s/%s.%d.ctl" % (ovs.dirs.RUNDIR,
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ovs.util.PROGRAM_NAME, os.getpid())
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if version is None:
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version = ovs.version.VERSION
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error, listener = ovs.stream.PassiveStream.open(path)
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if error:
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ovs.util.ovs_error(error, "could not initialize control socket %s"
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% path)
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return error, None
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ovs.unixctl.command_register("version", "", 0, 0, _unixctl_version,
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version)
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return 0, UnixctlServer(listener)
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class UnixctlClient(object):
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def __init__(self, conn):
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assert isinstance(conn, ovs.jsonrpc.Connection)
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self._conn = conn
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def transact(self, command, argv):
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assert isinstance(command, strtypes)
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assert isinstance(argv, list)
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for arg in argv:
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assert isinstance(arg, strtypes)
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request = Message.create_request(command, argv)
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error, reply = self._conn.transact_block(request)
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if error:
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vlog.warn("error communicating with %s: %s"
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% (self._conn.name, os.strerror(error)))
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return error, None, None
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if reply.error is not None:
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return 0, str(reply.error), None
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else:
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assert reply.result is not None
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return 0, None, str(reply.result)
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def close(self):
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self._conn.close()
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self.conn = None
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@staticmethod
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def create(path):
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assert isinstance(path, str)
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unix = "unix:%s" % ovs.util.abs_file_name(ovs.dirs.RUNDIR, path)
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error, stream = ovs.stream.Stream.open_block(
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ovs.stream.Stream.open(unix))
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if error:
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vlog.warn("failed to connect to %s" % path)
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return error, None
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return 0, UnixctlClient(ovs.jsonrpc.Connection(stream))
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