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https://github.com/openvswitch/ovs
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58de9fc30e
This code asserted that the callback argument was of type types.FunctionType. It's more pythonic to just check that the argument is callable, and not specifically that it's a function. There are other ways to implement a callback than types.FunctionType. Signed-off-by: Russell Bryant <russell@ovn.org> Acked-by: Ben Pfaff <blp@ovn.org>
85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
# Copyright (c) 2011, 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 six
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import ovs.util
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commands = {}
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strtypes = six.string_types
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class _UnixctlCommand(object):
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def __init__(self, usage, min_args, max_args, callback, aux):
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self.usage = usage
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self.min_args = min_args
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self.max_args = max_args
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self.callback = callback
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self.aux = aux
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def _unixctl_help(conn, unused_argv, unused_aux):
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reply = "The available commands are:\n"
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command_names = sorted(commands.keys())
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for name in command_names:
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reply += " "
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usage = commands[name].usage
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if usage:
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reply += "%-23s %s" % (name, usage)
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else:
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reply += name
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reply += "\n"
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conn.reply(reply)
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def command_register(name, usage, min_args, max_args, callback, aux):
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""" Registers a command with the given 'name' to be exposed by the
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UnixctlServer. 'usage' describes the arguments to the command; it is used
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only for presentation to the user in "help" output.
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'callback' is called when the command is received. It is passed a
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UnixctlConnection object, the list of arguments as unicode strings, and
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'aux'. Normally 'callback' should reply by calling
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UnixctlConnection.reply() or UnixctlConnection.reply_error() before it
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returns, but if the command cannot be handled immediately, then it can
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defer the reply until later. A given connection can only process a single
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request at a time, so a reply must be made eventually to avoid blocking
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that connection."""
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assert isinstance(name, strtypes)
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assert isinstance(usage, strtypes)
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assert isinstance(min_args, int)
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assert isinstance(max_args, int)
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assert callable(callback)
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if name not in commands:
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commands[name] = _UnixctlCommand(usage, min_args, max_args, callback,
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aux)
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def socket_name_from_target(target):
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assert isinstance(target, strtypes)
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if target.startswith("/"):
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return 0, target
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pidfile_name = "%s/%s.pid" % (ovs.dirs.RUNDIR, target)
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pid = ovs.daemon.read_pidfile(pidfile_name)
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if pid < 0:
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return -pid, "cannot read pidfile \"%s\"" % pidfile_name
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return 0, "%s/%s.%d.ctl" % (ovs.dirs.RUNDIR, target, pid)
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command_register("help", "", 0, 0, _unixctl_help, None)
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