root / lib / daemon.py @ 14f5f1b6
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# Copyright (C) 2006, 2007, 2008 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module with helper classes and functions for daemons"""
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import asyncore |
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import asynchat |
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import collections |
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import grp |
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import os |
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import pwd |
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import signal |
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import logging |
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import sched |
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import time |
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import socket |
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import select |
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import sys |
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from ganeti import utils |
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from ganeti import constants |
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from ganeti import errors |
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_DEFAULT_RUN_USER = "root"
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_DEFAULT_RUN_GROUP = "root"
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class SchedulerBreakout(Exception): |
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"""Exception used to get out of the scheduler loop
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"""
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def AsyncoreDelayFunction(timeout): |
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"""Asyncore-compatible scheduler delay function.
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This is a delay function for sched that, rather than actually sleeping,
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executes asyncore events happening in the meantime.
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After an event has occurred, rather than returning, it raises a
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SchedulerBreakout exception, which will force the current scheduler.run()
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invocation to terminate, so that we can also check for signals. The main loop
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will then call the scheduler run again, which will allow it to actually
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process any due events.
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This is needed because scheduler.run() doesn't support a count=..., as
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asyncore loop, and the scheduler module documents throwing exceptions from
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inside the delay function as an allowed usage model.
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"""
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asyncore.loop(timeout=timeout, count=1, use_poll=True) |
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raise SchedulerBreakout()
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class AsyncoreScheduler(sched.scheduler): |
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"""Event scheduler integrated with asyncore
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"""
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def __init__(self, timefunc): |
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sched.scheduler.__init__(self, timefunc, AsyncoreDelayFunction)
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class GanetiBaseAsyncoreDispatcher(asyncore.dispatcher): |
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"""Base Ganeti Asyncore Dispacher
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"""
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# this method is overriding an asyncore.dispatcher method
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def handle_error(self): |
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"""Log an error in handling any request, and proceed.
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"""
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logging.exception("Error while handling asyncore request")
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# this method is overriding an asyncore.dispatcher method
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def writable(self): |
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"""Most of the time we don't want to check for writability.
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"""
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return False |
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def FormatAddress(family, address): |
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"""Format a client's address
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@type family: integer
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@param family: socket family (one of socket.AF_*)
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@type address: family specific (usually tuple)
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@param address: address, as reported by this class
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"""
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if family == socket.AF_INET and len(address) == 2: |
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return "%s:%d" % address |
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elif family == socket.AF_UNIX and len(address) == 3: |
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return "pid=%s, uid=%s, gid=%s" % address |
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else:
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return str(address) |
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class AsyncStreamServer(GanetiBaseAsyncoreDispatcher): |
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"""A stream server to use with asyncore.
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Each request is accepted, and then dispatched to a separate asyncore
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dispatcher to handle.
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"""
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_REQUEST_QUEUE_SIZE = 5
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def __init__(self, family, address): |
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"""Constructor for AsyncUnixStreamSocket
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@type family: integer
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@param family: socket family (one of socket.AF_*)
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@type address: address family dependent
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@param address: address to bind the socket to
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"""
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GanetiBaseAsyncoreDispatcher.__init__(self)
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self.family = family
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self.create_socket(self.family, socket.SOCK_STREAM) |
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self.set_reuse_addr()
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self.bind(address)
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self.listen(self._REQUEST_QUEUE_SIZE) |
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# this method is overriding an asyncore.dispatcher method
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def handle_accept(self): |
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"""Accept a new client connection.
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Creates a new instance of the handler class, which will use asyncore to
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serve the client.
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"""
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accept_result = utils.IgnoreSignals(self.accept)
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if accept_result is not None: |
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connected_socket, client_address = accept_result |
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if self.family == socket.AF_UNIX: |
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# override the client address, as for unix sockets nothing meaningful
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# is passed in from accept anyway
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client_address = utils.GetSocketCredentials(connected_socket) |
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logging.info("Accepted connection from %s",
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FormatAddress(self.family, client_address))
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self.handle_connection(connected_socket, client_address)
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def handle_connection(self, connected_socket, client_address): |
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"""Handle an already accepted connection.
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"""
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raise NotImplementedError |
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class AsyncTerminatedMessageStream(asynchat.async_chat): |
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"""A terminator separated message stream asyncore module.
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Handles a stream connection receiving messages terminated by a defined
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separator. For each complete message handle_message is called.
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"""
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def __init__(self, connected_socket, peer_address, terminator, family, |
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unhandled_limit): |
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"""AsyncTerminatedMessageStream constructor.
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@type connected_socket: socket.socket
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@param connected_socket: connected stream socket to receive messages from
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@param peer_address: family-specific peer address
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@type terminator: string
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@param terminator: terminator separating messages in the stream
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@type family: integer
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@param family: socket family
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@type unhandled_limit: integer or None
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@param unhandled_limit: maximum unanswered messages
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"""
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# python 2.4/2.5 uses conn=... while 2.6 has sock=... we have to cheat by
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# using a positional argument rather than a keyword one.
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asynchat.async_chat.__init__(self, connected_socket)
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self.connected_socket = connected_socket
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# on python 2.4 there is no "family" attribute for the socket class
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# FIXME: when we move to python 2.5 or above remove the family parameter
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#self.family = self.connected_socket.family
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self.family = family
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self.peer_address = peer_address
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self.terminator = terminator
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self.unhandled_limit = unhandled_limit
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self.set_terminator(terminator)
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self.ibuffer = []
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self.receive_count = 0 |
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self.send_count = 0 |
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self.oqueue = collections.deque()
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self.iqueue = collections.deque()
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# this method is overriding an asynchat.async_chat method
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def collect_incoming_data(self, data): |
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self.ibuffer.append(data)
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def _can_handle_message(self): |
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return (self.unhandled_limit is None or |
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(self.receive_count < self.send_count + self.unhandled_limit) and |
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not self.iqueue) |
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# this method is overriding an asynchat.async_chat method
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def found_terminator(self): |
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message = "".join(self.ibuffer) |
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self.ibuffer = []
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message_id = self.receive_count
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# We need to increase the receive_count after checking if the message can
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# be handled, but before calling handle_message
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can_handle = self._can_handle_message()
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self.receive_count += 1 |
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if can_handle:
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self.handle_message(message, message_id)
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else:
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self.iqueue.append((message, message_id))
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def handle_message(self, message, message_id): |
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"""Handle a terminated message.
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@type message: string
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@param message: message to handle
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@type message_id: integer
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@param message_id: stream's message sequence number
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"""
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pass
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# TODO: move this method to raise NotImplementedError
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# raise NotImplementedError
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def send_message(self, message): |
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"""Send a message to the remote peer. This function is thread-safe.
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@type message: string
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@param message: message to send, without the terminator
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@warning: If calling this function from a thread different than the one
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performing the main asyncore loop, remember that you have to wake that one
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up.
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"""
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# If we just append the message we received to the output queue, this
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# function can be safely called by multiple threads at the same time, and
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# we don't need locking, since deques are thread safe. handle_write in the
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# asyncore thread will handle the next input message if there are any
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# enqueued.
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self.oqueue.append(message)
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# this method is overriding an asyncore.dispatcher method
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def readable(self): |
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# read from the socket if we can handle the next requests
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return self._can_handle_message() and asynchat.async_chat.readable(self) |
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# this method is overriding an asyncore.dispatcher method
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def writable(self): |
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# the output queue may become full just after we called writable. This only
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# works if we know we'll have something else waking us up from the select,
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# in such case, anyway.
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return asynchat.async_chat.writable(self) or self.oqueue |
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# this method is overriding an asyncore.dispatcher method
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def handle_write(self): |
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if self.oqueue: |
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# if we have data in the output queue, then send_message was called.
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# this means we can process one more message from the input queue, if
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# there are any.
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data = self.oqueue.popleft()
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self.push(data + self.terminator) |
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self.send_count += 1 |
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if self.iqueue: |
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self.handle_message(*self.iqueue.popleft()) |
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self.initiate_send()
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def close_log(self): |
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logging.info("Closing connection from %s",
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FormatAddress(self.family, self.peer_address)) |
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self.close()
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# this method is overriding an asyncore.dispatcher method
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def handle_expt(self): |
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self.close_log()
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# this method is overriding an asyncore.dispatcher method
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def handle_error(self): |
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"""Log an error in handling any request, and proceed.
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"""
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logging.exception("Error while handling asyncore request")
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self.close_log()
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class AsyncUDPSocket(GanetiBaseAsyncoreDispatcher): |
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"""An improved asyncore udp socket.
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"""
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def __init__(self): |
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"""Constructor for AsyncUDPSocket
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"""
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GanetiBaseAsyncoreDispatcher.__init__(self)
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self._out_queue = []
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self.create_socket(socket.AF_INET, socket.SOCK_DGRAM)
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# this method is overriding an asyncore.dispatcher method
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def handle_connect(self): |
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# Python thinks that the first udp message from a source qualifies as a
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# "connect" and further ones are part of the same connection. We beg to
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# differ and treat all messages equally.
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pass
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# this method is overriding an asyncore.dispatcher method
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def handle_read(self): |
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recv_result = utils.IgnoreSignals(self.recvfrom,
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constants.MAX_UDP_DATA_SIZE) |
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if recv_result is not None: |
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payload, address = recv_result |
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ip, port = address |
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self.handle_datagram(payload, ip, port)
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def handle_datagram(self, payload, ip, port): |
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"""Handle an already read udp datagram
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"""
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raise NotImplementedError |
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# this method is overriding an asyncore.dispatcher method
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def writable(self): |
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# We should check whether we can write to the socket only if we have
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# something scheduled to be written
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return bool(self._out_queue) |
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# this method is overriding an asyncore.dispatcher method
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def handle_write(self): |
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if not self._out_queue: |
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logging.error("handle_write called with empty output queue")
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return
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(ip, port, payload) = self._out_queue[0] |
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utils.IgnoreSignals(self.sendto, payload, 0, (ip, port)) |
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self._out_queue.pop(0) |
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def enqueue_send(self, ip, port, payload): |
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"""Enqueue a datagram to be sent when possible
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"""
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if len(payload) > constants.MAX_UDP_DATA_SIZE: |
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raise errors.UdpDataSizeError('Packet too big: %s > %s' % (len(payload), |
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constants.MAX_UDP_DATA_SIZE)) |
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self._out_queue.append((ip, port, payload))
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def process_next_packet(self, timeout=0): |
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"""Process the next datagram, waiting for it if necessary.
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@type timeout: float
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@param timeout: how long to wait for data
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@rtype: boolean
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@return: True if some data has been handled, False otherwise
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"""
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result = utils.WaitForFdCondition(self, select.POLLIN, timeout)
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if result is not None and result & select.POLLIN: |
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self.handle_read()
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return True |
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else:
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return False |
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class AsyncAwaker(GanetiBaseAsyncoreDispatcher): |
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"""A way to notify the asyncore loop that something is going on.
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If an asyncore daemon is multithreaded when a thread tries to push some data
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to a socket, the main loop handling asynchronous requests might be sleeping
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waiting on a select(). To avoid this it can create an instance of the
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AsyncAwaker, which other threads can use to wake it up.
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"""
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def __init__(self, signal_fn=None): |
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"""Constructor for AsyncAwaker
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@type signal_fn: function
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@param signal_fn: function to call when awaken
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"""
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GanetiBaseAsyncoreDispatcher.__init__(self)
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assert signal_fn == None or callable(signal_fn) |
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(self.in_socket, self.out_socket) = socket.socketpair(socket.AF_UNIX, |
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socket.SOCK_STREAM) |
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self.in_socket.setblocking(0) |
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self.in_socket.shutdown(socket.SHUT_WR)
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self.out_socket.shutdown(socket.SHUT_RD)
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self.set_socket(self.in_socket) |
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self.need_signal = True |
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self.signal_fn = signal_fn
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self.connected = True |
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# this method is overriding an asyncore.dispatcher method
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def handle_read(self): |
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utils.IgnoreSignals(self.recv, 4096) |
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if self.signal_fn: |
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self.signal_fn()
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self.need_signal = True |
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# this method is overriding an asyncore.dispatcher method
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def close(self): |
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asyncore.dispatcher.close(self)
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self.out_socket.close()
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def signal(self): |
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"""Signal the asyncore main loop.
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Any data we send here will be ignored, but it will cause the select() call
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to return.
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"""
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# Yes, there is a race condition here. No, we don't care, at worst we're
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# sending more than one wakeup token, which doesn't harm at all.
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if self.need_signal: |
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self.need_signal = False |
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self.out_socket.send("\0") |
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class Mainloop(object): |
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"""Generic mainloop for daemons
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@ivar scheduler: A sched.scheduler object, which can be used to register
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timed events
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"""
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def __init__(self): |
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"""Constructs a new Mainloop instance.
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"""
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self._signal_wait = []
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self.scheduler = AsyncoreScheduler(time.time)
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@utils.SignalHandled([signal.SIGCHLD])
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@utils.SignalHandled([signal.SIGTERM])
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@utils.SignalHandled([signal.SIGINT])
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def Run(self, signal_handlers=None): |
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"""Runs the mainloop.
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@type signal_handlers: dict
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@param signal_handlers: signal->L{utils.SignalHandler} passed by decorator
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"""
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assert isinstance(signal_handlers, dict) and \ |
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len(signal_handlers) > 0, \ |
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"Broken SignalHandled decorator"
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running = True
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# Start actual main loop
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while running:
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if not self.scheduler.empty(): |
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try:
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self.scheduler.run()
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except SchedulerBreakout:
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pass
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else:
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asyncore.loop(count=1, use_poll=True) |
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# Check whether a signal was raised
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for sig in signal_handlers: |
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handler = signal_handlers[sig] |
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if handler.called:
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self._CallSignalWaiters(sig)
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running = sig not in (signal.SIGTERM, signal.SIGINT) |
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handler.Clear() |
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def _CallSignalWaiters(self, signum): |
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"""Calls all signal waiters for a certain signal.
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@type signum: int
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@param signum: Signal number
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"""
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for owner in self._signal_wait: |
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owner.OnSignal(signum) |
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def RegisterSignal(self, owner): |
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"""Registers a receiver for signal notifications
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The receiver must support a "OnSignal(self, signum)" function.
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@type owner: instance
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@param owner: Receiver
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"""
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self._signal_wait.append(owner)
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def GenericMain(daemon_name, optionparser, dirs, check_fn, exec_fn, |
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multithreaded=False, console_logging=False, |
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default_ssl_cert=None, default_ssl_key=None, |
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user=_DEFAULT_RUN_USER, group=_DEFAULT_RUN_GROUP): |
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"""Shared main function for daemons.
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@type daemon_name: string
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@param daemon_name: daemon name
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@type optionparser: optparse.OptionParser
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@param optionparser: initialized optionparser with daemon-specific options
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(common -f -d options will be handled by this module)
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@type dirs: list of (string, integer)
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@param dirs: list of directories that must be created if they don't exist,
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and the permissions to be used to create them
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@type check_fn: function which accepts (options, args)
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@param check_fn: function that checks start conditions and exits if they're
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not met
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@type exec_fn: function which accepts (options, args)
|
523 |
@param exec_fn: function that's executed with the daemon's pid file held, and
|
524 |
runs the daemon itself.
|
525 |
@type multithreaded: bool
|
526 |
@param multithreaded: Whether the daemon uses threads
|
527 |
@type console_logging: boolean
|
528 |
@param console_logging: if True, the daemon will fall back to the system
|
529 |
console if logging fails
|
530 |
@type default_ssl_cert: string
|
531 |
@param default_ssl_cert: Default SSL certificate path
|
532 |
@type default_ssl_key: string
|
533 |
@param default_ssl_key: Default SSL key path
|
534 |
@param user: Default user to run as
|
535 |
@type user: string
|
536 |
@param group: Default group to run as
|
537 |
@type group: string
|
538 |
|
539 |
"""
|
540 |
optionparser.add_option("-f", "--foreground", dest="fork", |
541 |
help="Don't detach from the current terminal",
|
542 |
default=True, action="store_false") |
543 |
optionparser.add_option("-d", "--debug", dest="debug", |
544 |
help="Enable some debug messages",
|
545 |
default=False, action="store_true") |
546 |
optionparser.add_option("--syslog", dest="syslog", |
547 |
help="Enable logging to syslog (except debug"
|
548 |
" messages); one of 'no', 'yes' or 'only' [%s]" %
|
549 |
constants.SYSLOG_USAGE, |
550 |
default=constants.SYSLOG_USAGE, |
551 |
choices=["no", "yes", "only"]) |
552 |
|
553 |
if daemon_name in constants.DAEMONS_PORTS: |
554 |
default_bind_address = constants.IP4_ADDRESS_ANY |
555 |
default_port = utils.GetDaemonPort(daemon_name) |
556 |
|
557 |
# For networked daemons we allow choosing the port and bind address
|
558 |
optionparser.add_option("-p", "--port", dest="port", |
559 |
help="Network port (default: %s)" % default_port,
|
560 |
default=default_port, type="int")
|
561 |
optionparser.add_option("-b", "--bind", dest="bind_address", |
562 |
help=("Bind address (default: %s)" %
|
563 |
default_bind_address), |
564 |
default=default_bind_address, metavar="ADDRESS")
|
565 |
|
566 |
if default_ssl_key is not None and default_ssl_cert is not None: |
567 |
optionparser.add_option("--no-ssl", dest="ssl", |
568 |
help="Do not secure HTTP protocol with SSL",
|
569 |
default=True, action="store_false") |
570 |
optionparser.add_option("-K", "--ssl-key", dest="ssl_key", |
571 |
help=("SSL key path (default: %s)" %
|
572 |
default_ssl_key), |
573 |
default=default_ssl_key, type="string",
|
574 |
metavar="SSL_KEY_PATH")
|
575 |
optionparser.add_option("-C", "--ssl-cert", dest="ssl_cert", |
576 |
help=("SSL certificate path (default: %s)" %
|
577 |
default_ssl_cert), |
578 |
default=default_ssl_cert, type="string",
|
579 |
metavar="SSL_CERT_PATH")
|
580 |
|
581 |
# Disable the use of fork(2) if the daemon uses threads
|
582 |
utils.no_fork = multithreaded |
583 |
|
584 |
options, args = optionparser.parse_args() |
585 |
|
586 |
if getattr(options, "ssl", False): |
587 |
ssl_paths = { |
588 |
"certificate": options.ssl_cert,
|
589 |
"key": options.ssl_key,
|
590 |
} |
591 |
|
592 |
for name, path in ssl_paths.iteritems(): |
593 |
if not os.path.isfile(path): |
594 |
print >> sys.stderr, "SSL %s file '%s' was not found" % (name, path) |
595 |
sys.exit(constants.EXIT_FAILURE) |
596 |
|
597 |
# TODO: By initiating http.HttpSslParams here we would only read the files
|
598 |
# once and have a proper validation (isfile returns False on directories)
|
599 |
# at the same time.
|
600 |
|
601 |
if check_fn is not None: |
602 |
check_fn(options, args) |
603 |
|
604 |
utils.EnsureDirs(dirs) |
605 |
|
606 |
if options.fork:
|
607 |
try:
|
608 |
uid = pwd.getpwnam(user).pw_uid |
609 |
gid = grp.getgrnam(group).gr_gid |
610 |
except KeyError: |
611 |
raise errors.ConfigurationError("User or group not existing on system:" |
612 |
" %s:%s" % (user, group))
|
613 |
utils.CloseFDs() |
614 |
utils.Daemonize(constants.DAEMONS_LOGFILES[daemon_name], uid, gid) |
615 |
|
616 |
utils.WritePidFile(daemon_name) |
617 |
try:
|
618 |
utils.SetupLogging(logfile=constants.DAEMONS_LOGFILES[daemon_name], |
619 |
debug=options.debug, |
620 |
stderr_logging=not options.fork,
|
621 |
multithreaded=multithreaded, |
622 |
program=daemon_name, |
623 |
syslog=options.syslog, |
624 |
console_logging=console_logging) |
625 |
logging.info("%s daemon startup", daemon_name)
|
626 |
exec_fn(options, args) |
627 |
finally:
|
628 |
utils.RemovePidFile(daemon_name) |