root / lib / daemon.py @ f13973c4
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# Copyright (C) 2006, 2007, 2008, 2010 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 os |
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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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from ganeti import netutils |
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from ganeti import ssconf |
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from ganeti import runtime |
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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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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 = netutils.GetSocketCredentials(connected_socket) |
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logging.info("Accepted connection from %s",
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netutils.FormatAddress(client_address, family=self.family))
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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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netutils.FormatAddress(self.peer_address, family=self.family)) |
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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, family): |
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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._family = family
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self.create_socket(family, 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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if self._family == socket.AF_INET6: |
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# we ignore 'flow info' and 'scope id' as we don't need them
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ip, port, _, _ = address |
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else:
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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 _VerifyDaemonUser(daemon_name): |
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"""Verifies the process uid matches the configured uid.
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This method verifies that a daemon is started as the user it is
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intended to be run
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@param daemon_name: The name of daemon to be started
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@return: A tuple with the first item indicating success or not,
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the second item current uid and third with expected uid
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"""
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getents = runtime.GetEnts() |
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running_uid = os.getuid() |
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daemon_uids = { |
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constants.MASTERD: getents.masterd_uid, |
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constants.RAPI: getents.rapi_uid, |
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constants.NODED: getents.noded_uid, |
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constants.CONFD: getents.confd_uid, |
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} |
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return (daemon_uids[daemon_name] == running_uid, running_uid,
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daemon_uids[daemon_name]) |
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def _BeautifyError(err): |
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"""Try to format an error better.
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Since we're dealing with daemon startup errors, in many cases this
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will be due to socket error and such, so we try to format these cases better.
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@param err: an exception object
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@rtype: string
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@return: the formatted error description
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"""
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try:
|
527 |
if isinstance(err, socket.error): |
528 |
return "Socket-related error: %s (errno=%s)" % (err.args[1], err.args[0]) |
529 |
elif isinstance(err, EnvironmentError): |
530 |
if err.filename is None: |
531 |
return "%s (errno=%s)" % (err.strerror, err.errno) |
532 |
else:
|
533 |
return "%s (file %s) (errno=%s)" % (err.strerror, err.filename, |
534 |
err.errno) |
535 |
else:
|
536 |
return str(err) |
537 |
except Exception: # pylint: disable-msg=W0703 |
538 |
logging.exception("Error while handling existing error %s", err)
|
539 |
return "%s" % str(err) |
540 |
|
541 |
|
542 |
def GenericMain(daemon_name, optionparser, |
543 |
check_fn, prepare_fn, exec_fn, |
544 |
multithreaded=False, console_logging=False, |
545 |
default_ssl_cert=None, default_ssl_key=None): |
546 |
"""Shared main function for daemons.
|
547 |
|
548 |
@type daemon_name: string
|
549 |
@param daemon_name: daemon name
|
550 |
@type optionparser: optparse.OptionParser
|
551 |
@param optionparser: initialized optionparser with daemon-specific options
|
552 |
(common -f -d options will be handled by this module)
|
553 |
@type check_fn: function which accepts (options, args)
|
554 |
@param check_fn: function that checks start conditions and exits if they're
|
555 |
not met
|
556 |
@type prepare_fn: function which accepts (options, args)
|
557 |
@param prepare_fn: function that is run before forking, or None;
|
558 |
it's result will be passed as the third parameter to exec_fn, or
|
559 |
if None was passed in, we will just pass None to exec_fn
|
560 |
@type exec_fn: function which accepts (options, args, prepare_results)
|
561 |
@param exec_fn: function that's executed with the daemon's pid file held, and
|
562 |
runs the daemon itself.
|
563 |
@type multithreaded: bool
|
564 |
@param multithreaded: Whether the daemon uses threads
|
565 |
@type console_logging: boolean
|
566 |
@param console_logging: if True, the daemon will fall back to the system
|
567 |
console if logging fails
|
568 |
@type default_ssl_cert: string
|
569 |
@param default_ssl_cert: Default SSL certificate path
|
570 |
@type default_ssl_key: string
|
571 |
@param default_ssl_key: Default SSL key path
|
572 |
|
573 |
"""
|
574 |
optionparser.add_option("-f", "--foreground", dest="fork", |
575 |
help="Don't detach from the current terminal",
|
576 |
default=True, action="store_false") |
577 |
optionparser.add_option("-d", "--debug", dest="debug", |
578 |
help="Enable some debug messages",
|
579 |
default=False, action="store_true") |
580 |
optionparser.add_option("--syslog", dest="syslog", |
581 |
help="Enable logging to syslog (except debug"
|
582 |
" messages); one of 'no', 'yes' or 'only' [%s]" %
|
583 |
constants.SYSLOG_USAGE, |
584 |
default=constants.SYSLOG_USAGE, |
585 |
choices=["no", "yes", "only"]) |
586 |
|
587 |
if daemon_name in constants.DAEMONS_PORTS: |
588 |
default_bind_address = constants.IP4_ADDRESS_ANY |
589 |
family = ssconf.SimpleStore().GetPrimaryIPFamily() |
590 |
# family will default to AF_INET if there is no ssconf file (e.g. when
|
591 |
# upgrading a cluster from 2.2 -> 2.3. This is intended, as Ganeti clusters
|
592 |
# <= 2.2 can not be AF_INET6
|
593 |
if family == netutils.IP6Address.family:
|
594 |
default_bind_address = constants.IP6_ADDRESS_ANY |
595 |
|
596 |
default_port = netutils.GetDaemonPort(daemon_name) |
597 |
|
598 |
# For networked daemons we allow choosing the port and bind address
|
599 |
optionparser.add_option("-p", "--port", dest="port", |
600 |
help="Network port (default: %s)" % default_port,
|
601 |
default=default_port, type="int")
|
602 |
optionparser.add_option("-b", "--bind", dest="bind_address", |
603 |
help=("Bind address (default: '%s')" %
|
604 |
default_bind_address), |
605 |
default=default_bind_address, metavar="ADDRESS")
|
606 |
|
607 |
if default_ssl_key is not None and default_ssl_cert is not None: |
608 |
optionparser.add_option("--no-ssl", dest="ssl", |
609 |
help="Do not secure HTTP protocol with SSL",
|
610 |
default=True, action="store_false") |
611 |
optionparser.add_option("-K", "--ssl-key", dest="ssl_key", |
612 |
help=("SSL key path (default: %s)" %
|
613 |
default_ssl_key), |
614 |
default=default_ssl_key, type="string",
|
615 |
metavar="SSL_KEY_PATH")
|
616 |
optionparser.add_option("-C", "--ssl-cert", dest="ssl_cert", |
617 |
help=("SSL certificate path (default: %s)" %
|
618 |
default_ssl_cert), |
619 |
default=default_ssl_cert, type="string",
|
620 |
metavar="SSL_CERT_PATH")
|
621 |
|
622 |
# Disable the use of fork(2) if the daemon uses threads
|
623 |
if multithreaded:
|
624 |
utils.DisableFork() |
625 |
|
626 |
options, args = optionparser.parse_args() |
627 |
|
628 |
if getattr(options, "ssl", False): |
629 |
ssl_paths = { |
630 |
"certificate": options.ssl_cert,
|
631 |
"key": options.ssl_key,
|
632 |
} |
633 |
|
634 |
for name, path in ssl_paths.iteritems(): |
635 |
if not os.path.isfile(path): |
636 |
print >> sys.stderr, "SSL %s file '%s' was not found" % (name, path) |
637 |
sys.exit(constants.EXIT_FAILURE) |
638 |
|
639 |
# TODO: By initiating http.HttpSslParams here we would only read the files
|
640 |
# once and have a proper validation (isfile returns False on directories)
|
641 |
# at the same time.
|
642 |
|
643 |
result, running_uid, expected_uid = _VerifyDaemonUser(daemon_name) |
644 |
if not result: |
645 |
msg = ("%s started using wrong user ID (%d), expected %d" %
|
646 |
(daemon_name, running_uid, expected_uid)) |
647 |
print >> sys.stderr, msg
|
648 |
sys.exit(constants.EXIT_FAILURE) |
649 |
|
650 |
if check_fn is not None: |
651 |
check_fn(options, args) |
652 |
|
653 |
if options.fork:
|
654 |
utils.CloseFDs() |
655 |
wpipe = utils.Daemonize(logfile=constants.DAEMONS_LOGFILES[daemon_name]) |
656 |
else:
|
657 |
wpipe = None
|
658 |
|
659 |
utils.WritePidFile(utils.DaemonPidFileName(daemon_name)) |
660 |
try:
|
661 |
try:
|
662 |
utils.SetupLogging(logfile=constants.DAEMONS_LOGFILES[daemon_name], |
663 |
debug=options.debug, |
664 |
stderr_logging=not options.fork,
|
665 |
multithreaded=multithreaded, |
666 |
program=daemon_name, |
667 |
syslog=options.syslog, |
668 |
console_logging=console_logging) |
669 |
if callable(prepare_fn): |
670 |
prep_results = prepare_fn(options, args) |
671 |
else:
|
672 |
prep_results = None
|
673 |
logging.info("%s daemon startup", daemon_name)
|
674 |
except Exception, err: |
675 |
utils.WriteErrorToFD(wpipe, _BeautifyError(err)) |
676 |
raise
|
677 |
|
678 |
if wpipe is not None: |
679 |
# we're done with the preparation phase, we close the pipe to
|
680 |
# let the parent know it's safe to exit
|
681 |
os.close(wpipe) |
682 |
|
683 |
exec_fn(options, args, prep_results) |
684 |
finally:
|
685 |
utils.RemoveFile(utils.DaemonPidFileName(daemon_name)) |