Synnefo » snf-ganeti

#!/usr/bin/python

#

# 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.

""" Ganeti Remote API master script.

"""

import glob

import logging

import optparse

import sys

import os

import signal

from ganeti import constants

from ganeti import errors

from ganeti import http

from ganeti import daemon

from ganeti import ssconf

from ganeti import utils

from ganeti.rapi import connector

import ganeti.http.server

class RemoteApiRequestContext(object):

  """Data structure for Remote API requests.

  """

  def __init__(self):

    self.handler = None

    self.handler_fn = None

class RemoteApiHttpServer(http.server.HttpServer):

  """REST Request Handler Class.

  """

  def __init__(self, *args, **kwargs):

    http.server.HttpServer.__init__(self, *args, **kwargs)

    self._resmap = connector.Mapper()

  def _GetRequestContext(self, req):

    """Returns the context for a request.

    The context is cached in the req.private variable.

    """

    if req.private is None:

      (HandlerClass, items, args) = self._resmap.getController(req.request_path)

      ctx = RemoteApiRequestContext()

      ctx.handler = HandlerClass(items, args, req)

      method = req.request_method.upper()

      try:

        ctx.handler_fn = getattr(ctx.handler, method)

      except AttributeError, err:

        raise http.HttpBadRequest()

      req.private = ctx

    return req.private

  def HandleRequest(self, req):

    """Handles a request.

    """

    ctx = self._GetRequestContext(req)

    try:

      result = ctx.handler_fn()

      sn = ctx.handler.getSerialNumber()

      if sn:

        req.response_headers[http.HTTP_ETAG] = str(sn)

    except:

      logging.exception("Error while handling the %s request", method)

      raise

    return result

def ParseOptions():

  """Parse the command line options.

  @return: (options, args) as from OptionParser.parse_args()

  """

  parser = optparse.OptionParser(description="Ganeti Remote API",

                    usage="%prog [-d] [-p port]",

                    version="%%prog (ganeti) %s" %

                                 constants.RAPI_VERSION)

  parser.add_option("-d", "--debug", dest="debug",

                    help="Enable some debug messages",

                    default=False, action="store_true")

  parser.add_option("-p", "--port", dest="port",

                    help="Port to run API (%s default)." %

                                 constants.RAPI_PORT,

                    default=constants.RAPI_PORT, type="int")

  parser.add_option("-S", "--https", dest="ssl",

                    help="Secure HTTP protocol with SSL",

                    default=False, action="store_true")

  parser.add_option("-K", "--ssl-key", dest="ssl_key",

                    help="SSL key",

                    default=None, type="string")

  parser.add_option("-C", "--ssl-cert", dest="ssl_cert",

                    help="SSL certificate",

                    default=None, type="string")

  parser.add_option("-f", "--foreground", dest="fork",

                    help="Don't detach from the current terminal",

                    default=True, action="store_false")

  options, args = parser.parse_args()

  if len(args) != 0:

    print >> sys.stderr, "Usage: %s [-d] [-p port]" % sys.argv[0]

    sys.exit(1)

  if options.ssl and not (options.ssl_cert and options.ssl_key):

    print >> sys.stderr, ("For secure mode please provide "

                         "--ssl-key and --ssl-cert arguments")

    sys.exit(1)

  return options, args

def main():

  """Main function.

  """

  options, args = ParseOptions()

  ssconf.CheckMaster(options.debug)

  if options.fork:

    utils.Daemonize(logfile=constants.LOG_RAPISERVER)

  utils.SetupLogging(constants.LOG_RAPISERVER, debug=options.debug,

                     stderr_logging=not options.fork)

  utils.WritePidFile(constants.RAPI_PID)

  try:

    mainloop = daemon.Mainloop()

    server = RemoteApiHttpServer(mainloop, "", options.port)

    server.Start()

    try:

      mainloop.Run()

    finally:

      server.Stop()

  finally:

    utils.RemovePidFile(constants.RAPI_PID)

if __name__ == '__main__':

  main()