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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007 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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"""Ganeti node daemon"""
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# functions in this module need to have a given name structure, so:
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# pylint: disable-msg=C0103
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import os
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import sys
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import traceback
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import SocketServer
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import errno
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import logging
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import signal
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from optparse import OptionParser
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from ganeti import backend
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from ganeti import constants
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from ganeti import objects
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from ganeti import errors
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from ganeti import jstore
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from ganeti import daemon
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from ganeti import http
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from ganeti import utils
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import ganeti.http.server
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queue_lock = None
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def _RequireJobQueueLock(fn):
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  """Decorator for job queue manipulating functions.
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  """
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  QUEUE_LOCK_TIMEOUT = 10
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  def wrapper(*args, **kwargs):
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    # Locking in exclusive, blocking mode because there could be several
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    # children running at the same time. Waiting up to 10 seconds.
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    queue_lock.Exclusive(blocking=True, timeout=QUEUE_LOCK_TIMEOUT)
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    try:
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      return fn(*args, **kwargs)
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    finally:
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      queue_lock.Unlock()
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  return wrapper
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class NodeHttpServer(http.server.HttpServer):
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  """The server implementation.
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  This class holds all methods exposed over the RPC interface.
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  """
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  def __init__(self, *args, **kwargs):
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    http.server.HttpServer.__init__(self, *args, **kwargs)
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    self.noded_pid = os.getpid()
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  def HandleRequest(self, req):
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    """Handle a request.
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    """
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    if req.request_method.upper() != http.HTTP_PUT:
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      raise http.HttpBadRequest()
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    path = req.request_path
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    if path.startswith("/"):
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      path = path[1:]
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    method = getattr(self, "perspective_%s" % path, None)
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    if method is None:
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      raise http.HttpNotFound()
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    try:
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      try:
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        return method(req.request_body)
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      except:
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        logging.exception("Error in RPC call")
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        raise
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    except errors.QuitGanetiException, err:
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      # Tell parent to quit
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      os.kill(self.noded_pid, signal.SIGTERM)
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  # the new block devices  --------------------------
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  @staticmethod
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  def perspective_blockdev_create(params):
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    """Create a block device.
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    """
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    bdev_s, size, owner, on_primary, info = params
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    bdev = objects.Disk.FromDict(bdev_s)
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    if bdev is None:
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      raise ValueError("can't unserialize data!")
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    return backend.CreateBlockDevice(bdev, size, owner, on_primary, info)
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  @staticmethod
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  def perspective_blockdev_remove(params):
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    """Remove a block device.
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    """
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    bdev_s = params[0]
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    bdev = objects.Disk.FromDict(bdev_s)
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    return backend.RemoveBlockDevice(bdev)
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  @staticmethod
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  def perspective_blockdev_rename(params):
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    """Remove a block device.
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    """
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    devlist = [(objects.Disk.FromDict(ds), uid) for ds, uid in params]
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    return backend.RenameBlockDevices(devlist)
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  @staticmethod
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  def perspective_blockdev_assemble(params):
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    """Assemble a block device.
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    """
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    bdev_s, owner, on_primary = params
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    bdev = objects.Disk.FromDict(bdev_s)
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    if bdev is None:
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      raise ValueError("can't unserialize data!")
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    return backend.AssembleBlockDevice(bdev, owner, on_primary)
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  @staticmethod
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  def perspective_blockdev_shutdown(params):
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    """Shutdown a block device.
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    """
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    bdev_s = params[0]
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    bdev = objects.Disk.FromDict(bdev_s)
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    if bdev is None:
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      raise ValueError("can't unserialize data!")
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    return backend.ShutdownBlockDevice(bdev)
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  @staticmethod
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  def perspective_blockdev_addchildren(params):
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    """Add a child to a mirror device.
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    Note: this is only valid for mirror devices. It's the caller's duty
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    to send a correct disk, otherwise we raise an error.
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    """
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    bdev_s, ndev_s = params
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    bdev = objects.Disk.FromDict(bdev_s)
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    ndevs = [objects.Disk.FromDict(disk_s) for disk_s in ndev_s]
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    if bdev is None or ndevs.count(None) > 0:
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      raise ValueError("can't unserialize data!")
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    return backend.MirrorAddChildren(bdev, ndevs)
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  @staticmethod
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  def perspective_blockdev_removechildren(params):
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    """Remove a child from a mirror device.
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    This is only valid for mirror devices, of course. It's the callers
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    duty to send a correct disk, otherwise we raise an error.
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    """
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    bdev_s, ndev_s = params
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    bdev = objects.Disk.FromDict(bdev_s)
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    ndevs = [objects.Disk.FromDict(disk_s) for disk_s in ndev_s]
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    if bdev is None or ndevs.count(None) > 0:
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      raise ValueError("can't unserialize data!")
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    return backend.MirrorRemoveChildren(bdev, ndevs)
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  @staticmethod
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  def perspective_blockdev_getmirrorstatus(params):
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    """Return the mirror status for a list of disks.
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    """
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    disks = [objects.Disk.FromDict(dsk_s)
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            for dsk_s in params]
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    return backend.GetMirrorStatus(disks)
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  @staticmethod
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  def perspective_blockdev_find(params):
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    """Expose the FindBlockDevice functionality for a disk.
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    This will try to find but not activate a disk.
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    """
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    disk = objects.Disk.FromDict(params[0])
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    return backend.FindBlockDevice(disk)
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  @staticmethod
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  def perspective_blockdev_snapshot(params):
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    """Create a snapshot device.
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    Note that this is only valid for LVM disks, if we get passed
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    something else we raise an exception. The snapshot device can be
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    remove by calling the generic block device remove call.
213

    
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    """
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    cfbd = objects.Disk.FromDict(params[0])
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    return backend.SnapshotBlockDevice(cfbd)
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  @staticmethod
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  def perspective_blockdev_grow(params):
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    """Grow a stack of devices.
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    """
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    cfbd = objects.Disk.FromDict(params[0])
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    amount = params[1]
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    return backend.GrowBlockDevice(cfbd, amount)
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  @staticmethod
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  def perspective_blockdev_close(params):
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    """Closes the given block devices.
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    """
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    disks = [objects.Disk.FromDict(cf) for cf in params]
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    return backend.CloseBlockDevices(disks)
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  # export/import  --------------------------
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  @staticmethod
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  def perspective_snapshot_export(params):
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    """Export a given snapshot.
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    """
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    disk = objects.Disk.FromDict(params[0])
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    dest_node = params[1]
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    instance = objects.Instance.FromDict(params[2])
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    cluster_name = params[3]
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    dev_idx = params[4]
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    return backend.ExportSnapshot(disk, dest_node, instance,
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                                  cluster_name, dev_idx)
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  @staticmethod
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  def perspective_finalize_export(params):
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    """Expose the finalize export functionality.
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    """
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    instance = objects.Instance.FromDict(params[0])
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    snap_disks = [objects.Disk.FromDict(str_data)
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                  for str_data in params[1]]
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    return backend.FinalizeExport(instance, snap_disks)
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  @staticmethod
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  def perspective_export_info(params):
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    """Query information about an existing export on this node.
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    The given path may not contain an export, in which case we return
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    None.
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    """
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    path = params[0]
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    einfo = backend.ExportInfo(path)
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    if einfo is None:
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      return einfo
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    return einfo.Dumps()
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  @staticmethod
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  def perspective_export_list(params):
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    """List the available exports on this node.
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    Note that as opposed to export_info, which may query data about an
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    export in any path, this only queries the standard Ganeti path
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    (constants.EXPORT_DIR).
281

    
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    """
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    return backend.ListExports()
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  @staticmethod
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  def perspective_export_remove(params):
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    """Remove an export.
288

    
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    """
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    export = params[0]
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    return backend.RemoveExport(export)
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  # volume  --------------------------
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  @staticmethod
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  def perspective_volume_list(params):
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    """Query the list of logical volumes in a given volume group.
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    """
300
    vgname = params[0]
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    return backend.GetVolumeList(vgname)
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  @staticmethod
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  def perspective_vg_list(params):
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    """Query the list of volume groups.
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    """
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    return backend.ListVolumeGroups()
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  # bridge  --------------------------
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  @staticmethod
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  def perspective_bridges_exist(params):
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    """Check if all bridges given exist on this node.
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    """
317
    bridges_list = params[0]
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    return backend.BridgesExist(bridges_list)
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  # instance  --------------------------
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  @staticmethod
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  def perspective_instance_os_add(params):
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    """Install an OS on a given instance.
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    """
327
    inst_s = params[0]
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    inst = objects.Instance.FromDict(inst_s)
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    return backend.AddOSToInstance(inst)
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  @staticmethod
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  def perspective_instance_run_rename(params):
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    """Runs the OS rename script for an instance.
334

    
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    """
336
    inst_s, old_name = params
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    inst = objects.Instance.FromDict(inst_s)
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    return backend.RunRenameInstance(inst, old_name)
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  @staticmethod
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  def perspective_instance_os_import(params):
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    """Run the import function of an OS onto a given instance.
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    """
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    inst_s, src_node, src_images, cluster_name = params
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    inst = objects.Instance.FromDict(inst_s)
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    return backend.ImportOSIntoInstance(inst, src_node, src_images,
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                                        cluster_name)
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  @staticmethod
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  def perspective_instance_shutdown(params):
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    """Shutdown an instance.
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    """
355
    instance = objects.Instance.FromDict(params[0])
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    return backend.ShutdownInstance(instance)
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  @staticmethod
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  def perspective_instance_start(params):
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    """Start an instance.
361

    
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    """
363
    instance = objects.Instance.FromDict(params[0])
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    extra_args = params[1]
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    return backend.StartInstance(instance, extra_args)
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  @staticmethod
368
  def perspective_instance_migrate(params):
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    """Migrates an instance.
370

    
371
    """
372
    instance, target, live = params
373
    instance = objects.Instance.FromDict(instance)
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    return backend.MigrateInstance(instance, target, live)
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376
  @staticmethod
377
  def perspective_instance_reboot(params):
378
    """Reboot an instance.
379

    
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    """
381
    instance = objects.Instance.FromDict(params[0])
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    reboot_type = params[1]
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    extra_args = params[2]
384
    return backend.RebootInstance(instance, reboot_type, extra_args)
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  @staticmethod
387
  def perspective_instance_info(params):
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    """Query instance information.
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    """
391
    return backend.GetInstanceInfo(params[0], params[1])
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  @staticmethod
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  def perspective_all_instances_info(params):
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    """Query information about all instances.
396

    
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    """
398
    return backend.GetAllInstancesInfo(params[0])
399

    
400
  @staticmethod
401
  def perspective_instance_list(params):
402
    """Query the list of running instances.
403

    
404
    """
405
    return backend.GetInstanceList(params[0])
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407
  # node --------------------------
408

    
409
  @staticmethod
410
  def perspective_node_tcp_ping(params):
411
    """Do a TcpPing on the remote node.
412

    
413
    """
414
    return utils.TcpPing(params[1], params[2], timeout=params[3],
415
                         live_port_needed=params[4], source=params[0])
416

    
417
  @staticmethod
418
  def perspective_node_has_ip_address(params):
419
    """Checks if a node has the given ip address.
420

    
421
    """
422
    return utils.OwnIpAddress(params[0])
423

    
424
  @staticmethod
425
  def perspective_node_info(params):
426
    """Query node information.
427

    
428
    """
429
    vgname, hypervisor_type = params
430
    return backend.GetNodeInfo(vgname, hypervisor_type)
431

    
432
  @staticmethod
433
  def perspective_node_add(params):
434
    """Complete the registration of this node in the cluster.
435

    
436
    """
437
    return backend.AddNode(params[0], params[1], params[2],
438
                           params[3], params[4], params[5])
439

    
440
  @staticmethod
441
  def perspective_node_verify(params):
442
    """Run a verify sequence on this node.
443

    
444
    """
445
    return backend.VerifyNode(params[0], params[1])
446

    
447
  @staticmethod
448
  def perspective_node_start_master(params):
449
    """Promote this node to master status.
450

    
451
    """
452
    return backend.StartMaster(params[0])
453

    
454
  @staticmethod
455
  def perspective_node_stop_master(params):
456
    """Demote this node from master status.
457

    
458
    """
459
    return backend.StopMaster(params[0])
460

    
461
  @staticmethod
462
  def perspective_node_leave_cluster(params):
463
    """Cleanup after leaving a cluster.
464

    
465
    """
466
    return backend.LeaveCluster()
467

    
468
  @staticmethod
469
  def perspective_node_volumes(params):
470
    """Query the list of all logical volume groups.
471

    
472
    """
473
    return backend.NodeVolumes()
474

    
475
  @staticmethod
476
  def perspective_node_demote_from_mc(params):
477
    """Demote a node from the master candidate role.
478

    
479
    """
480
    return backend.DemoteFromMC()
481

    
482

    
483
  # cluster --------------------------
484

    
485
  @staticmethod
486
  def perspective_version(params):
487
    """Query version information.
488

    
489
    """
490
    return constants.PROTOCOL_VERSION
491

    
492
  @staticmethod
493
  def perspective_upload_file(params):
494
    """Upload a file.
495

    
496
    Note that the backend implementation imposes strict rules on which
497
    files are accepted.
498

    
499
    """
500
    return backend.UploadFile(*params)
501

    
502
  @staticmethod
503
  def perspective_master_info(params):
504
    """Query master information.
505

    
506
    """
507
    return backend.GetMasterInfo()
508

    
509
  @staticmethod
510
  def perspective_write_ssconf_files(params):
511
    """Write ssconf files.
512

    
513
    """
514
    (values,) = params
515
    return backend.WriteSsconfFiles(values)
516

    
517
  # os -----------------------
518

    
519
  @staticmethod
520
  def perspective_os_diagnose(params):
521
    """Query detailed information about existing OSes.
522

    
523
    """
524
    return [os.ToDict() for os in backend.DiagnoseOS()]
525

    
526
  @staticmethod
527
  def perspective_os_get(params):
528
    """Query information about a given OS.
529

    
530
    """
531
    name = params[0]
532
    try:
533
      os_obj = backend.OSFromDisk(name)
534
    except errors.InvalidOS, err:
535
      os_obj = objects.OS.FromInvalidOS(err)
536
    return os_obj.ToDict()
537

    
538
  # hooks -----------------------
539

    
540
  @staticmethod
541
  def perspective_hooks_runner(params):
542
    """Run hook scripts.
543

    
544
    """
545
    hpath, phase, env = params
546
    hr = backend.HooksRunner()
547
    return hr.RunHooks(hpath, phase, env)
548

    
549
  # iallocator -----------------
550

    
551
  @staticmethod
552
  def perspective_iallocator_runner(params):
553
    """Run an iallocator script.
554

    
555
    """
556
    name, idata = params
557
    iar = backend.IAllocatorRunner()
558
    return iar.Run(name, idata)
559

    
560
  # test -----------------------
561

    
562
  @staticmethod
563
  def perspective_test_delay(params):
564
    """Run test delay.
565

    
566
    """
567
    duration = params[0]
568
    return utils.TestDelay(duration)
569

    
570
  # file storage ---------------
571

    
572
  @staticmethod
573
  def perspective_file_storage_dir_create(params):
574
    """Create the file storage directory.
575

    
576
    """
577
    file_storage_dir = params[0]
578
    return backend.CreateFileStorageDir(file_storage_dir)
579

    
580
  @staticmethod
581
  def perspective_file_storage_dir_remove(params):
582
    """Remove the file storage directory.
583

    
584
    """
585
    file_storage_dir = params[0]
586
    return backend.RemoveFileStorageDir(file_storage_dir)
587

    
588
  @staticmethod
589
  def perspective_file_storage_dir_rename(params):
590
    """Rename the file storage directory.
591

    
592
    """
593
    old_file_storage_dir = params[0]
594
    new_file_storage_dir = params[1]
595
    return backend.RenameFileStorageDir(old_file_storage_dir,
596
                                        new_file_storage_dir)
597

    
598
  # jobs ------------------------
599

    
600
  @staticmethod
601
  @_RequireJobQueueLock
602
  def perspective_jobqueue_update(params):
603
    """Update job queue.
604

    
605
    """
606
    (file_name, content) = params
607
    return backend.JobQueueUpdate(file_name, content)
608

    
609
  @staticmethod
610
  @_RequireJobQueueLock
611
  def perspective_jobqueue_purge(params):
612
    """Purge job queue.
613

    
614
    """
615
    return backend.JobQueuePurge()
616

    
617
  @staticmethod
618
  @_RequireJobQueueLock
619
  def perspective_jobqueue_rename(params):
620
    """Rename a job queue file.
621

    
622
    """
623
    (old, new) = params
624

    
625
    return backend.JobQueueRename(old, new)
626

    
627
  @staticmethod
628
  def perspective_jobqueue_set_drain(params):
629
    """Set/unset the queue drain flag.
630

    
631
    """
632
    drain_flag = params[0]
633
    return backend.JobQueueSetDrainFlag(drain_flag)
634

    
635

    
636
  # hypervisor ---------------
637

    
638
  @staticmethod
639
  def perspective_hypervisor_validate_params(params):
640
    """Validate the hypervisor parameters.
641

    
642
    """
643
    (hvname, hvparams) = params
644
    return backend.ValidateHVParams(hvname, hvparams)
645

    
646

    
647
def ParseOptions():
648
  """Parse the command line options.
649

    
650
  Returns:
651
    (options, args) as from OptionParser.parse_args()
652

    
653
  """
654
  parser = OptionParser(description="Ganeti node daemon",
655
                        usage="%prog [-f] [-d]",
656
                        version="%%prog (ganeti) %s" %
657
                        constants.RELEASE_VERSION)
658

    
659
  parser.add_option("-f", "--foreground", dest="fork",
660
                    help="Don't detach from the current terminal",
661
                    default=True, action="store_false")
662
  parser.add_option("-d", "--debug", dest="debug",
663
                    help="Enable some debug messages",
664
                    default=False, action="store_true")
665
  options, args = parser.parse_args()
666
  return options, args
667

    
668

    
669
def EnsureRuntimeEnvironment():
670
  """Ensure our run-time environment is complete.
671

    
672
  Currently this creates directories which could be missing, either
673
  due to directories being on a tmpfs mount, or due to incomplete
674
  packaging.
675

    
676
  """
677
  dirs = [(val, constants.RUN_DIRS_MODE) for val in constants.SUB_RUN_DIRS]
678
  dirs.append((constants.LOG_OS_DIR, 0750))
679
  for dir_name, dir_mode in dirs:
680
    if not os.path.exists(dir_name):
681
      try:
682
        os.mkdir(dir_name, dir_mode)
683
      except EnvironmentError, err:
684
        if err.errno != errno.EEXIST:
685
          print ("Node setup wrong, cannot create directory '%s': %s" %
686
                 (dir_name, err))
687
          sys.exit(5)
688
    if not os.path.isdir(dir_name):
689
      print ("Node setup wrong, '%s' is not a directory" % dir_name)
690
      sys.exit(5)
691

    
692

    
693
def main():
694
  """Main function for the node daemon.
695

    
696
  """
697
  global queue_lock
698

    
699
  options, args = ParseOptions()
700
  utils.debug = options.debug
701
  for fname in (constants.SSL_CERT_FILE,):
702
    if not os.path.isfile(fname):
703
      print "config %s not there, will not run." % fname
704
      sys.exit(5)
705

    
706
  try:
707
    port = utils.GetNodeDaemonPort()
708
  except errors.ConfigurationError, err:
709
    print "Cluster configuration incomplete: '%s'" % str(err)
710
    sys.exit(5)
711

    
712
  EnsureRuntimeEnvironment()
713

    
714
  # become a daemon
715
  if options.fork:
716
    utils.Daemonize(logfile=constants.LOG_NODESERVER)
717

    
718
  utils.WritePidFile(constants.NODED_PID)
719
  try:
720
    utils.SetupLogging(logfile=constants.LOG_NODESERVER, debug=options.debug,
721
                       stderr_logging=not options.fork)
722
    logging.info("ganeti node daemon startup")
723

    
724
    # Read SSL certificate
725
    ssl_params = http.HttpSslParams(ssl_key_path=constants.SSL_CERT_FILE,
726
                                    ssl_cert_path=constants.SSL_CERT_FILE)
727

    
728
    # Prepare job queue
729
    queue_lock = jstore.InitAndVerifyQueue(must_lock=False)
730

    
731
    mainloop = daemon.Mainloop()
732
    server = NodeHttpServer(mainloop, "", port,
733
                            ssl_params=ssl_params, ssl_verify_peer=True)
734
    server.Start()
735
    try:
736
      mainloop.Run()
737
    finally:
738
      server.Stop()
739
  finally:
740
    utils.RemovePidFile(constants.NODED_PID)
741

    
742

    
743
if __name__ == '__main__':
744
  main()