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#!/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.


"""Configuration management for Ganeti

This module provides the interface to the ganeti cluster configuration.


The configuration data is stored on every node but is updated on the
master only. After each update, the master distributes the data to the
other nodes.

Currently the data storage format is pickle as yaml was initially not
available, then we used it but it was a memory-eating slow beast, so
we reverted to pickle using custom Unpicklers.

"""

import os
import socket
import tempfile
import random

from ganeti import errors
from ganeti import logger
from ganeti import utils
from ganeti import constants
from ganeti import rpc
from ganeti import objects


class ConfigWriter:
  """The interface to the cluster configuration"""

  def __init__(self, cfg_file=None, offline=False):
    self._config_data = None
    self._config_time = None
    self._offline = offline
    if cfg_file is None:
      self._cfg_file = constants.CLUSTER_CONF_FILE
    else:
      self._cfg_file = cfg_file

  # this method needs to be static, so that we can call it on the class
  @staticmethod
  def IsCluster():
    """Check if the cluster is configured.

    """
    return os.path.exists(constants.CLUSTER_CONF_FILE)

  def GenerateMAC(self):
    """Generate a MAC for an instance.

    This should check the current instances for duplicates.

    """
    self._OpenConfig()
    self._ReleaseLock()
    prefix = self._config_data.cluster.mac_prefix
    all_macs = self._AllMACs()
    retries = 64
    while retries > 0:
      byte1 = random.randrange(0, 256)
      byte2 = random.randrange(0, 256)
      byte3 = random.randrange(0, 256)
      mac = "%s:%02x:%02x:%02x" % (prefix, byte1, byte2, byte3)
      if mac not in all_macs:
        break
      retries -= 1
    else:
      raise errors.ConfigurationError, ("Can't generate unique MAC")
    return mac

  def _AllMACs(self):
    """Return all MACs present in the config.

    """
    self._OpenConfig()
    self._ReleaseLock()

    result = []
    for instance in self._config_data.instances.values():
      for nic in instance.nics:
        result.append(nic.mac)

    return result

  def VerifyConfig(self):
    """Stub verify function.
    """
    self._OpenConfig()
    self._ReleaseLock()

    result = []
    seen_macs = []
    data = self._config_data
    for instance_name in data.instances:
      instance = data.instances[instance_name]
      if instance.primary_node not in data.nodes:
        result.append("Instance '%s' has invalid primary node '%s'" %
                      (instance_name, instance.primary_node))
      for snode in instance.secondary_nodes:
        if snode not in data.nodes:
          result.append("Instance '%s' has invalid secondary node '%s'" %
                        (instance_name, snode))
      for idx, nic in enumerate(instance.nics):
        if nic.mac in seen_macs:
          result.append("Instance '%s' has NIC %d mac %s duplicate" %
                        (instance_name, idx, nic.mac))
        else:
          seen_macs.append(nic.mac)
    return result


  def SetDiskID(self, disk, node_name):
    """Convert the unique ID to the ID needed on the target nodes.

    This is used only for drbd, which needs ip/port configuration.

    The routine descends down and updates its children also, because
    this helps when the only the top device is passed to the remote
    node.

    """
    if disk.children:
      for child in disk.children:
        self.SetDiskID(child, node_name)

    if disk.logical_id is None and disk.physical_id is not None:
      return
    if disk.dev_type == "drbd":
      pnode, snode, port = disk.logical_id
      if node_name not in (pnode, snode):
        raise errors.ConfigurationError, ("DRBD device not knowing node %s" %
                                          node_name)
      pnode_info = self.GetNodeInfo(pnode)
      snode_info = self.GetNodeInfo(snode)
      if pnode_info is None or snode_info is None:
        raise errors.ConfigurationError("Can't find primary or secondary node"
                                        " for %s" % str(disk))
      if pnode == node_name:
        disk.physical_id = (pnode_info.secondary_ip, port,
                            snode_info.secondary_ip, port)
      else: # it must be secondary, we tested above
        disk.physical_id = (snode_info.secondary_ip, port,
                            pnode_info.secondary_ip, port)
    else:
      disk.physical_id = disk.logical_id
    return

  def AllocatePort(self):
    """Allocate a port.

    The port will be recorded in the cluster config.

    """
    self._OpenConfig()

    self._config_data.cluster.highest_used_port += 1
    if self._config_data.cluster.highest_used_port >= constants.LAST_DRBD_PORT:
      raise errors.ConfigurationError, ("The highest used port is greater"
                                        " than %s. Aborting." %
                                        constants.LAST_DRBD_PORT)
    port = self._config_data.cluster.highest_used_port

    self._WriteConfig()
    return port

  def GetHostKey(self):
    """Return the rsa hostkey from the config.

    Args: None

    Returns: rsa hostkey
    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.cluster.rsahostkeypub

  def AddInstance(self, instance):
    """Add an instance to the config.

    This should be used after creating a new instance.

    Args:
      instance: the instance object
    """
    if not isinstance(instance, objects.Instance):
      raise errors.ProgrammerError("Invalid type passed to AddInstance")

    self._OpenConfig()
    self._config_data.instances[instance.name] = instance
    self._WriteConfig()

  def MarkInstanceUp(self, instance_name):
    """Mark the instance status to up in the config.

    """
    self._OpenConfig()

    if instance_name not in self._config_data.instances:
      raise errors.ConfigurationError, ("Unknown instance '%s'" %
                                        instance_name)
    instance = self._config_data.instances[instance_name]
    instance.status = "up"
    self._WriteConfig()

  def RemoveInstance(self, instance_name):
    """Remove the instance from the configuration.

    """
    self._OpenConfig()

    if instance_name not in self._config_data.instances:
      raise errors.ConfigurationError, ("Unknown instance '%s'" %
                                        instance_name)
    del self._config_data.instances[instance_name]
    self._WriteConfig()

  def MarkInstanceDown(self, instance_name):
    """Mark the status of an instance to down in the configuration.

    """

    self._OpenConfig()

    if instance_name not in self._config_data.instances:
      raise errors.ConfigurationError, ("Unknown instance '%s'" %
                                        instance_name)
    instance = self._config_data.instances[instance_name]
    instance.status = "down"
    self._WriteConfig()

  def GetInstanceList(self):
    """Get the list of instances.

    Returns:
      array of instances, ex. ['instance2.example.com','instance1.example.com']
      these contains all the instances, also the ones in Admin_down state

    """
    self._OpenConfig()
    self._ReleaseLock()

    return self._config_data.instances.keys()

  def ExpandInstanceName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    self._OpenConfig()
    self._ReleaseLock()

    return utils.MatchNameComponent(short_name,
                                    self._config_data.instances.keys())

  def GetInstanceInfo(self, instance_name):
    """Returns informations about an instance.

    It takes the information from the configuration file. Other informations of
    an instance are taken from the live systems.

    Args:
      instance: name of the instance, ex instance1.example.com

    Returns:
      the instance object

    """
    self._OpenConfig()
    self._ReleaseLock()

    if instance_name not in self._config_data.instances:
      return None

    return self._config_data.instances[instance_name]

  def AddNode(self, node):
    """Add a node to the configuration.

    Args:
      node: an object.Node instance

    """
    self._OpenConfig()
    self._config_data.nodes[node.name] = node
    self._WriteConfig()

  def RemoveNode(self, node_name):
    """Remove a node from the configuration.

    """
    self._OpenConfig()
    if node_name not in self._config_data.nodes:
      raise errors.ConfigurationError, ("Unknown node '%s'" % node_name)

    del self._config_data.nodes[node_name]
    self._WriteConfig()

  def ExpandNodeName(self, short_name):
    """Attempt to expand an incomplete instance name.

    """
    self._OpenConfig()
    self._ReleaseLock()

    return utils.MatchNameComponent(short_name,
                                    self._config_data.nodes.keys())

  def GetNodeInfo(self, node_name):
    """Get the configuration of a node, as stored in the config.

    Args: node: nodename (tuple) of the node

    Returns: the node object

    """
    self._OpenConfig()
    self._ReleaseLock()

    if node_name not in self._config_data.nodes:
      return None

    return self._config_data.nodes[node_name]

  def GetNodeList(self):
    """Return the list of nodes which are in the configuration.

    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.nodes.keys()

  def DumpConfig(self):
    """Return the entire configuration of the cluster.
    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data

  def _BumpSerialNo(self):
    """Bump up the serial number of the config.

    """
    self._config_data.cluster.serial_no += 1

  def _OpenConfig(self):
    """Read the config data from disk.

    In case we already have configuration data and the config file has
    the same mtime as when we read it, we skip the parsing of the
    file, since de-serialisation could be slow.

    """
    try:
      st = os.stat(self._cfg_file)
    except OSError, err:
      raise errors.ConfigurationError, "Can't stat config file: %s" % err
    if (self._config_data is not None and
        self._config_time is not None and
        self._config_time == st.st_mtime):
      # data is current, so skip loading of config file
      return
    f = open(self._cfg_file, 'r')
    try:
      try:
        data = objects.ConfigObject.Load(f)
      except Exception, err:
        raise errors.ConfigurationError, err
    finally:
      f.close()
    if (not hasattr(data, 'cluster') or
        not hasattr(data.cluster, 'config_version')):
      raise errors.ConfigurationError, ("Incomplete configuration"
                                        " (missing cluster.config_version)")
    if data.cluster.config_version != constants.CONFIG_VERSION:
      raise errors.ConfigurationError, ("Cluster configuration version"
                                        " mismatch, got %s instead of %s" %
                                        (data.cluster.config_version,
                                         constants.CONFIG_VERSION))
    self._config_data = data
    self._config_time = st.st_mtime

  def _ReleaseLock(self):
    """xxxx
    """

  def _DistributeConfig(self):
    """Distribute the configuration to the other nodes.

    Currently, this only copies the configuration file. In the future,
    it could be used to encapsulate the 2/3-phase update mechanism.

    """
    if self._offline:
      return True
    bad = False
    nodelist = self.GetNodeList()
    myhostname = socket.gethostname()

    tgt_list = []
    for node in nodelist:
      nodeinfo = self.GetNodeInfo(node)
      if nodeinfo.name == myhostname:
        continue
      tgt_list.append(node)

    result = rpc.call_upload_file(tgt_list, self._cfg_file)
    for node in tgt_list:
      if not result[node]:
        logger.Error("copy of file %s to node %s failed" %
                     (self._cfg_file, node))
        bad = True
    return not bad

  def _WriteConfig(self, destination=None):
    """Write the configuration data to persistent storage.

    """
    if destination is None:
      destination = self._cfg_file
    self._BumpSerialNo()
    dir_name, file_name = os.path.split(destination)
    fd, name = tempfile.mkstemp('.newconfig', file_name, dir_name)
    f = os.fdopen(fd, 'w')
    try:
      self._config_data.Dump(f)
      os.fsync(f.fileno())
    finally:
      f.close()
    # we don't need to do os.close(fd) as f.close() did it
    os.rename(name, destination)
    self._DistributeConfig()

  def InitConfig(self, node, primary_ip, secondary_ip,
                 clustername, hostkeypub, mac_prefix, vg_name, def_bridge):
    """Create the initial cluster configuration.

    It will contain the current node, which will also be the master
    node, and no instances or operating systmes.

    Args:
      node: the nodename of the initial node
      primary_ip: the IP address of the current host
      secondary_ip: the secondary IP of the current host or None
      clustername: the name of the cluster
      hostkeypub: the public hostkey of this host
    """

    hu_port = constants.FIRST_DRBD_PORT - 1
    globalconfig = objects.Cluster(config_version=constants.CONFIG_VERSION,
                                   serial_no=1, master_node=node,
                                   name=clustername,
                                   rsahostkeypub=hostkeypub,
                                   highest_used_port=hu_port,
                                   mac_prefix=mac_prefix,
                                   volume_group_name=vg_name,
                                   default_bridge=def_bridge)
    if secondary_ip is None:
      secondary_ip = primary_ip
    nodeconfig = objects.Node(name=node, primary_ip=primary_ip,
                              secondary_ip=secondary_ip)

    self._config_data = objects.ConfigData(nodes={node: nodeconfig},
                                           instances={},
                                           cluster=globalconfig)
    self._WriteConfig()

  def GetClusterName(self):
    """Return the cluster name.

    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.cluster.name

  def GetVGName(self):
    """Return the volume group name.

    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.cluster.volume_group_name

  def GetDefBridge(self):
    """Return the default bridge.

    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.cluster.default_bridge

  def GetMACPrefix(self):
    """Return the mac prefix.

    """
    self._OpenConfig()
    self._ReleaseLock()
    return self._config_data.cluster.mac_prefix