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openvswitch
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python
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ovs
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unixctl
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server.py
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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))