Synnefo » snf-ganeti » ganeti-local

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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.

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# 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.

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# 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.

"""Script to show add a new node to the cluster

"""

# pylint: disable-msg=C0103

import os

import socket

import httplib

import simplejson

from ganeti import logger

from ganeti import utils

from ganeti import objects

class NodeController:

  """Node-handling class.

  For each node that we speak with, we create an instance of this

  class, so that we have a safe place to store the details of this

  individual call.

  """

  def __init__(self, parent, node):

    self.parent = parent

    self.node = node

    self.failed = False

    self.http_conn = hc = httplib.HTTPConnection(node, self.parent.port)

    try:

      hc.connect()

      hc.putrequest('PUT', "/%s" % self.parent.procedure,

                    skip_accept_encoding=True)

      hc.putheader('Content-Length', str(len(parent.body)))

      hc.endheaders()

      hc.send(parent.body)

    except socket.error, err:

      logger.Error("Error connecting to %s: %s" % (node, str(err)))

      self.failed = True

  def get_response(self):

    """Try to process the response from the node.

    """

    if self.failed:

      # we already failed in connect

      return False

    resp = self.http_conn.getresponse()

    if resp.status != 200:

      return False

    try:

      length = int(resp.getheader('Content-Length', '0'))

    except ValueError:

      return False

    if not length:

      logger.Error("Zero-length reply from %s" % self.node)

      return False

    payload = resp.read(length)

    unload = simplejson.loads(payload)

    return unload

class Client:

  """RPC Client class.

  This class, given a (remote) method name, a list of parameters and a

  list of nodes, will contact (in parallel) all nodes, and return a

  dict of results (key: node name, value: result).

  One current bug is that generic failure is still signalled by

  'False' result, which is not good. This overloading of values can

  cause bugs.

  """

  result_set = False

  result = False

  allresult = []

  def __init__(self, procedure, args):

    self.port = utils.GetNodeDaemonPort()

    self.nodepw = utils.GetNodeDaemonPassword()

    self.nc = {}

    self.results = {}

    self.procedure = procedure

    self.args = args

    self.body = simplejson.dumps(args)

  #--- generic connector -------------

  def connect_list(self, node_list):

    """Add a list of nodes to the target nodes.

    """

    for node in node_list:

      self.connect(node)

  def connect(self, connect_node):

    """Add a node to the target list.

    """

    self.nc[connect_node] = nc = NodeController(self, connect_node)

  def getresult(self):

    """Return the results of the call.

    """

    return self.results

  def run(self):

    """Wrapper over reactor.run().

    This function simply calls reactor.run() if we have any requests

    queued, otherwise it does nothing.

    """

    for node, nc in self.nc.items():

      self.results[node] = nc.get_response()

def call_volume_list(node_list, vg_name):

  """Gets the logical volumes present in a given volume group.

  This is a multi-node call.

  """

  c = Client("volume_list", [vg_name])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_vg_list(node_list):

  """Gets the volume group list.

  This is a multi-node call.

  """

  c = Client("vg_list", [])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_bridges_exist(node, bridges_list):

  """Checks if a node has all the bridges given.

  This method checks if all bridges given in the bridges_list are

  present on the remote node, so that an instance that uses interfaces

  on those bridges can be started.

  This is a single-node call.

  """

  c = Client("bridges_exist", [bridges_list])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_start(node, instance, extra_args):

  """Starts an instance.

  This is a single-node call.

  """

  c = Client("instance_start", [instance.ToDict(), extra_args])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_shutdown(node, instance):

  """Stops an instance.

  This is a single-node call.

  """

  c = Client("instance_shutdown", [instance.ToDict()])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_migrate(node, instance, target, live):

  """Migrate an instance.

  This is a single-node call.

  @type node: string

  @param node: the node on which the instance is currently running

  @type instance: C{objects.Instance}

  @param instance: the instance definition

  @type target: string

  @param target: the target node name

  @type live: boolean

  @param live: whether the migration should be done live or not (the

      interpretation of this parameter is left to the hypervisor)

  """

  c = Client("instance_migrate", [instance.ToDict(), target, live])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_reboot(node, instance, reboot_type, extra_args):

  """Reboots an instance.

  This is a single-node call.

  """

  c = Client("instance_reboot", [instance.ToDict(), reboot_type, extra_args])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_os_add(node, inst, osdev, swapdev):

  """Installs an OS on the given instance.

  This is a single-node call.

  """

  params = [inst.ToDict(), osdev, swapdev]

  c = Client("instance_os_add", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_run_rename(node, inst, old_name, osdev, swapdev):

  """Run the OS rename script for an instance.

  This is a single-node call.

  """

  params = [inst.ToDict(), old_name, osdev, swapdev]

  c = Client("instance_run_rename", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_instance_info(node, instance, hname):

  """Returns information about a single instance.

  This is a single-node call.

  @type node_list: list

  @param node_list: the list of nodes to query

  @type instance: string

  @param instance: the instance name

  @type hname: string

  @param hname: the hypervisor type of the instance

  """

  c = Client("instance_info", [instance])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_all_instances_info(node_list, hypervisor_list):

  """Returns information about all instances on the given nodes.

  This is a multi-node call.

  @type node_list: list

  @param node_list: the list of nodes to query

  @type hypervisor_list: list

  @param hypervisor_list: the hypervisors to query for instances

  """

  c = Client("all_instances_info", [hypervisor_list])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_instance_list(node_list, hypervisor_list):

  """Returns the list of running instances on a given node.

  This is a multi-node call.

  @type node_list: list

  @param node_list: the list of nodes to query

  @type hypervisor_list: list

  @param hypervisor_list: the hypervisors to query for instances

  """

  c = Client("instance_list", [hypervisor_list])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_node_tcp_ping(node, source, target, port, timeout, live_port_needed):

  """Do a TcpPing on the remote node

  This is a single-node call.

  """

  c = Client("node_tcp_ping", [source, target, port, timeout,

                               live_port_needed])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_node_info(node_list, vg_name, hypervisor_type):

  """Return node information.

  This will return memory information and volume group size and free

  space.

  This is a multi-node call.

  @type node_list: list

  @param node_list: the list of nodes to query

  @type vgname: C{string}

  @param vgname: the name of the volume group to ask for disk space information

  @type hypervisor_type: C{str}

  @param hypervisor_type: the name of the hypervisor to ask for

      memory information

  """

  c = Client("node_info", [vg_name, hypervisor_type])

  c.connect_list(node_list)

  c.run()

  retux = c.getresult()

  for node_name in retux:

    ret = retux.get(node_name, False)

    if type(ret) != dict:

      logger.Error("could not connect to node %s" % (node_name))

      ret = {}

    utils.CheckDict(ret,

                    { 'memory_total' : '-',

                      'memory_dom0' : '-',

                      'memory_free' : '-',

                      'vg_size' : 'node_unreachable',

                      'vg_free' : '-' },

                    "call_node_info",

                    )

  return retux

def call_node_add(node, dsa, dsapub, rsa, rsapub, ssh, sshpub):

  """Add a node to the cluster.

  This is a single-node call.

  """

  params = [dsa, dsapub, rsa, rsapub, ssh, sshpub]

  c = Client("node_add", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_node_verify(node_list, checkdict, cluster_name):

  """Request verification of given parameters.

  This is a multi-node call.

  """

  c = Client("node_verify", [checkdict, cluster_name])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_node_start_master(node, start_daemons):

  """Tells a node to activate itself as a master.

  This is a single-node call.

  """

  c = Client("node_start_master", [start_daemons])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_node_stop_master(node, stop_daemons):

  """Tells a node to demote itself from master status.

  This is a single-node call.

  """

  c = Client("node_stop_master", [stop_daemons])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_master_info(node_list):

  """Query master info.

  This is a multi-node call.

  """

  c = Client("master_info", [])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_version(node_list):

  """Query node version.

  This is a multi-node call.

  """

  c = Client("version", [])

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_blockdev_create(node, bdev, size, owner, on_primary, info):

  """Request creation of a given block device.

  This is a single-node call.

  """

  params = [bdev.ToDict(), size, owner, on_primary, info]

  c = Client("blockdev_create", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_remove(node, bdev):

  """Request removal of a given block device.

  This is a single-node call.

  """

  c = Client("blockdev_remove", [bdev.ToDict()])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_rename(node, devlist):

  """Request rename of the given block devices.

  This is a single-node call.

  """

  params = [(d.ToDict(), uid) for d, uid in devlist]

  c = Client("blockdev_rename", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_assemble(node, disk, owner, on_primary):

  """Request assembling of a given block device.

  This is a single-node call.

  """

  params = [disk.ToDict(), owner, on_primary]

  c = Client("blockdev_assemble", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_shutdown(node, disk):

  """Request shutdown of a given block device.

  This is a single-node call.

  """

  c = Client("blockdev_shutdown", [disk.ToDict()])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_addchildren(node, bdev, ndevs):

  """Request adding a list of children to a (mirroring) device.

  This is a single-node call.

  """

  params = [bdev.ToDict(), [disk.ToDict() for disk in ndevs]]

  c = Client("blockdev_addchildren", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_removechildren(node, bdev, ndevs):

  """Request removing a list of children from a (mirroring) device.

  This is a single-node call.

  """

  params = [bdev.ToDict(), [disk.ToDict() for disk in ndevs]]

  c = Client("blockdev_removechildren", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_getmirrorstatus(node, disks):

  """Request status of a (mirroring) device.

  This is a single-node call.

  """

  params = [dsk.ToDict() for dsk in disks]

  c = Client("blockdev_getmirrorstatus", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_find(node, disk):

  """Request identification of a given block device.

  This is a single-node call.

  """

  c = Client("blockdev_find", [disk.ToDict()])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_close(node, disks):

  """Closes the given block devices.

  This is a single-node call.

  """

  params = [cf.ToDict() for cf in disks]

  c = Client("blockdev_close", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_upload_file(node_list, file_name):

  """Upload a file.

  The node will refuse the operation in case the file is not on the

  approved file list.

  This is a multi-node call.

  """

  fh = file(file_name)

  try:

    data = fh.read()

  finally:

    fh.close()

  st = os.stat(file_name)

  params = [file_name, data, st.st_mode, st.st_uid, st.st_gid,

            st.st_atime, st.st_mtime]

  c = Client("upload_file", params)

  c.connect_list(node_list)

  c.run()

  return c.getresult()

def call_os_diagnose(node_list):

  """Request a diagnose of OS definitions.

  This is a multi-node call.

  """

  c = Client("os_diagnose", [])

  c.connect_list(node_list)

  c.run()

  result = c.getresult()

  new_result = {}

  for node_name in result:

    if result[node_name]:

      nr = [objects.OS.FromDict(oss) for oss in result[node_name]]

    else:

      nr = []

    new_result[node_name] = nr

  return new_result

def call_os_get(node, name):

  """Returns an OS definition.

  This is a single-node call.

  """

  c = Client("os_get", [name])

  c.connect(node)

  c.run()

  result = c.getresult().get(node, False)

  if isinstance(result, dict):

    return objects.OS.FromDict(result)

  else:

    return result

def call_hooks_runner(node_list, hpath, phase, env):

  """Call the hooks runner.

  Args:

    - op: the OpCode instance

    - env: a dictionary with the environment

  This is a multi-node call.

  """

  params = [hpath, phase, env]

  c = Client("hooks_runner", params)

  c.connect_list(node_list)

  c.run()

  result = c.getresult()

  return result

def call_iallocator_runner(node, name, idata):

  """Call an iallocator on a remote node

  Args:

    - name: the iallocator name

    - input: the json-encoded input string

  This is a single-node call.

  """

  params = [name, idata]

  c = Client("iallocator_runner", params)

  c.connect(node)

  c.run()

  result = c.getresult().get(node, False)

  return result

def call_blockdev_grow(node, cf_bdev, amount):

  """Request a snapshot of the given block device.

  This is a single-node call.

  """

  c = Client("blockdev_grow", [cf_bdev.ToDict(), amount])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_blockdev_snapshot(node, cf_bdev):

  """Request a snapshot of the given block device.

  This is a single-node call.

  """

  c = Client("blockdev_snapshot", [cf_bdev.ToDict()])

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_snapshot_export(node, snap_bdev, dest_node, instance, cluster_name):

  """Request the export of a given snapshot.

  This is a single-node call.

  """

  params = [snap_bdev.ToDict(), dest_node, instance.ToDict(), cluster_name]

  c = Client("snapshot_export", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_finalize_export(node, instance, snap_disks):

  """Request the completion of an export operation.

  This writes the export config file, etc.

  This is a single-node call.

  """

  flat_disks = []

  for disk in snap_disks:

    flat_disks.append(disk.ToDict())

  params = [instance.ToDict(), flat_disks]

  c = Client("finalize_export", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_export_info(node, path):

  """Queries the export information in a given path.

  This is a single-node call.

  """

  c = Client("export_info", [path])

  c.connect(node)

  c.run()

  result = c.getresult().get(node, False)

  if not result:

    return result

  return objects.SerializableConfigParser.Loads(str(result))

def call_instance_os_import(node, inst, osdev, swapdev,

                            src_node, src_image, cluster_name):

  """Request the import of a backup into an instance.

  This is a single-node call.

  """

  params = [inst.ToDict(), osdev, swapdev, src_node, src_image, cluster_name]

  c = Client("instance_os_import", params)

  c.connect(node)

  c.run()

  return c.getresult().get(node, False)

def call_export_list(node_list):

  """Gets the stored exports list.

  This is a multi-node call.

  """

  c = Client("export_list", [])

  c.connect_list(node_list)

  c.run()

  result = c.getresult()

  return result

def call_export_remove(node, export):