ganeti-masterd 9.43 KB
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#!/usr/bin/python -u
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#

# Copyright (C) 2006, 2007 Google Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.


"""Master daemon program.

Some classes deviates from the standard style guide since the
inheritance from parent classes requires it.

"""


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import sys
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import SocketServer
import time
import collections
import Queue
import random
import signal
import simplejson
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import logging
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from cStringIO import StringIO
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from optparse import OptionParser
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from ganeti import config
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from ganeti import constants
from ganeti import mcpu
from ganeti import opcodes
from ganeti import jqueue
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from ganeti import locking
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from ganeti import luxi
from ganeti import utils
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from ganeti import errors
from ganeti import ssconf
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from ganeti import logger
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from ganeti import workerpool
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from ganeti import rpc
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CLIENT_REQUEST_WORKERS = 16

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EXIT_NOTMASTER = constants.EXIT_NOTMASTER
EXIT_NODESETUP_ERROR = constants.EXIT_NODESETUP_ERROR
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class ClientRequestWorker(workerpool.BaseWorker):
  def RunTask(self, server, request, client_address):
    """Process the request.

    This is copied from the code in ThreadingMixIn.

    """
    try:
      server.finish_request(request, client_address)
      server.close_request(request)
    except:
      server.handle_error(request, client_address)
      server.close_request(request)


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class IOServer(SocketServer.UnixStreamServer):
  """IO thread class.

  This class takes care of initializing the other threads, setting
  signal handlers (which are processed only in this thread), and doing
  cleanup at shutdown.

  """
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  def __init__(self, address, rqhandler):
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    """IOServer constructor

    Args:
      address: the address to bind this IOServer to
      rqhandler: RequestHandler type object

    """
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    SocketServer.UnixStreamServer.__init__(self, address, rqhandler)
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    # We'll only start threads once we've forked.
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    self.context = None
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    self.request_workers = None
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  def setup_queue(self):
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    self.context = GanetiContext()
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    self.request_workers = workerpool.WorkerPool(CLIENT_REQUEST_WORKERS,
                                                 ClientRequestWorker)
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  def process_request(self, request, client_address):
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    """Add task to workerpool to process request.
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    """
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    self.request_workers.AddTask(self, request, client_address)
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  def serve_forever(self):
    """Handle one request at a time until told to quit."""
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    sighandler = utils.SignalHandler([signal.SIGINT, signal.SIGTERM])
    try:
      while not sighandler.called:
        self.handle_request()
    finally:
      sighandler.Reset()
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  def server_cleanup(self):
    """Cleanup the server.

    This involves shutting down the processor threads and the master
    socket.

    """
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    try:
      self.server_close()
      utils.RemoveFile(constants.MASTER_SOCKET)
    finally:
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      if self.request_workers:
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        self.request_workers.TerminateWorkers()
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      if self.context:
        self.context.jobqueue.Shutdown()
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class ClientRqHandler(SocketServer.BaseRequestHandler):
  """Client handler"""
  EOM = '\3'
  READ_SIZE = 4096

  def setup(self):
    self._buffer = ""
    self._msgs = collections.deque()
    self._ops = ClientOps(self.server)

  def handle(self):
    while True:
      msg = self.read_message()
      if msg is None:
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        logging.info("client closed connection")
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        break
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      request = simplejson.loads(msg)
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      logging.debug("request: %s", request)
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      if not isinstance(request, dict):
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        logging.error("wrong request received: %s", msg)
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        break
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      method = request.get(luxi.KEY_METHOD, None)
      args = request.get(luxi.KEY_ARGS, None)
      if method is None or args is None:
        logging.error("no method or args in request")
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        break
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      success = False
      try:
        result = self._ops.handle_request(method, args)
        success = True
      except:
        logging.error("Unexpected exception", exc_info=True)
        err = sys.exc_info()
        result = "Caught exception: %s" % str(err[1])

      response = {
        luxi.KEY_SUCCESS: success,
        luxi.KEY_RESULT: result,
        }
      logging.debug("response: %s", response)
      self.send_message(simplejson.dumps(response))
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  def read_message(self):
    while not self._msgs:
      data = self.request.recv(self.READ_SIZE)
      if not data:
        return None
      new_msgs = (self._buffer + data).split(self.EOM)
      self._buffer = new_msgs.pop()
      self._msgs.extend(new_msgs)
    return self._msgs.popleft()

  def send_message(self, msg):
    #print "sending", msg
    self.request.sendall(msg + self.EOM)


class ClientOps:
  """Class holding high-level client operations."""
  def __init__(self, server):
    self.server = server

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  def handle_request(self, method, args):
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    queue = self.server.context.jobqueue
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    # TODO: Parameter validation

    if method == luxi.REQ_SUBMIT_JOB:
      ops = [opcodes.OpCode.LoadOpCode(state) for state in args]
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      # we need to compute the node list here, since from now on all
      # operations require locks on the queue or the storage, and we
      # shouldn't get another lock
      node_list = self.server.context.cfg.GetNodeList()
      return queue.SubmitJob(ops, node_list)
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    elif method == luxi.REQ_CANCEL_JOB:
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      job_id = args
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      return queue.CancelJob(job_id)
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    elif method == luxi.REQ_ARCHIVE_JOB:
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      job_id = args
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      return queue.ArchiveJob(job_id)

    elif method == luxi.REQ_QUERY_JOBS:
      (job_ids, fields) = args
      return queue.QueryJobs(job_ids, fields)

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    elif method == luxi.REQ_QUERY_INSTANCES:
      (names, fields) = args
      op = opcodes.OpQueryInstances(names=names, output_fields=fields)
      return self._Query(op)

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    elif method == luxi.REQ_QUERY_NODES:
      (names, fields) = args
      op = opcodes.OpQueryNodes(names=names, output_fields=fields)
      return self._Query(op)

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    else:
      raise ValueError("Invalid operation")
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  def _DummyLog(self, *args):
    pass

  def _Query(self, op):
    """Runs the specified opcode and returns the result.

    """
    proc = mcpu.Processor(self.server.context)
    # TODO: Where should log messages go?
    return proc.ExecOpCode(op, self._DummyLog)

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class GanetiContext(object):
  """Context common to all ganeti threads.

  This class creates and holds common objects shared by all threads.

  """
  _instance = None

  def __init__(self):
    """Constructs a new GanetiContext object.

    There should be only a GanetiContext object at any time, so this
    function raises an error if this is not the case.

    """
    assert self.__class__._instance is None, "double GanetiContext instance"

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    # Create global configuration object
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    self.cfg = config.ConfigWriter()
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    # Locking manager
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    self.glm = locking.GanetiLockManager(
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                self.cfg.GetNodeList(),
                self.cfg.GetInstanceList())

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    # Job queue
    self.jobqueue = jqueue.JobQueue(self)

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    # setting this also locks the class against attribute modifications
    self.__class__._instance = self

  def __setattr__(self, name, value):
    """Setting GanetiContext attributes is forbidden after initialization.

    """
    assert self.__class__._instance is None, "Attempt to modify Ganeti Context"
    object.__setattr__(self, name, value)


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def ParseOptions():
  """Parse the command line options.

  Returns:
    (options, args) as from OptionParser.parse_args()

  """
  parser = OptionParser(description="Ganeti master daemon",
                        usage="%prog [-f] [-d]",
                        version="%%prog (ganeti) %s" %
                        constants.RELEASE_VERSION)

  parser.add_option("-f", "--foreground", dest="fork",
                    help="Don't detach from the current terminal",
                    default=True, action="store_false")
  parser.add_option("-d", "--debug", dest="debug",
                    help="Enable some debug messages",
                    default=False, action="store_true")
  options, args = parser.parse_args()
  return options, args


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def main():
  """Main function"""

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  options, args = ParseOptions()
  utils.debug = options.debug
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  utils.no_fork = True
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  ssconf.CheckMaster(options.debug)
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  master = IOServer(constants.MASTER_SOCKET, ClientRqHandler)
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  # become a daemon
  if options.fork:
    utils.Daemonize(logfile=constants.LOG_MASTERDAEMON,
                    noclose_fds=[master.fileno()])

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  utils.WritePidFile(constants.MASTERD_PID)
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  logger.SetupLogging(constants.LOG_MASTERDAEMON, debug=options.debug,
                      stderr_logging=not options.fork)
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  logging.info("ganeti master daemon startup")
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  # activate ip
  master_node = ssconf.SimpleStore().GetMasterNode()
  if not rpc.call_node_start_master(master_node, False):
    logging.error("Can't activate master IP address")

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  master.setup_queue()
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  try:
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    master.serve_forever()
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  finally:
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    master.server_cleanup()
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    utils.RemovePidFile(constants.MASTERD_PID)
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if __name__ == "__main__":
  main()