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#!/usr/bin/python
#

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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.


"""Burnin program

"""
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import sys
import optparse
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from itertools import izip, islice, cycle
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from cStringIO import StringIO
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from ganeti import opcodes
from ganeti import mcpu
from ganeti import constants
from ganeti import cli
from ganeti import logger
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from ganeti import errors
from ganeti import utils
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USAGE = ("\tburnin -o OS_NAME [options...] instance_name ...")
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def Usage():
  """Shows program usage information and exits the program."""

  print >> sys.stderr, "Usage:"
  print >> sys.stderr, USAGE
  sys.exit(2)

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def Log(msg):
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  """Simple function that prints out its argument.

  """
  print msg
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  sys.stdout.flush()
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class Burner(object):
  """Burner class."""

  def __init__(self):
    """Constructor."""
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    logger.SetupLogging(debug=False, program="ganeti/burnin")
    self._feed_buf = StringIO()
    self.proc = mcpu.Processor(feedback=self.Feedback)
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    self.nodes = []
    self.instances = []
    self.to_rem = []
    self.opts = None
    self.ParseOptions()
    self.GetState()

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  def ClearFeedbackBuf(self):
    """Clear the feedback buffer."""
    self._feed_buf.truncate(0)

  def GetFeedbackBuf(self):
    """Return the contents of the buffer."""
    return self._feed_buf.getvalue()

  def Feedback(self, msg):
    """Acumulate feedback in our buffer."""
    self._feed_buf.write(msg)
    self._feed_buf.write("\n")

  def ExecOp(self, op):
    """Execute an opcode and manage the exec buffer."""
    self.ClearFeedbackBuf()
    return self.proc.ExecOpCode(op)

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  def ParseOptions(self):
    """Parses the command line options.

    In case of command line errors, it will show the usage and exit the
    program.

    """

    parser = optparse.OptionParser(usage="\n%s" % USAGE,
                                   version="%%prog (ganeti) %s" %
                                   constants.RELEASE_VERSION,
                                   option_class=cli.CliOption)

    parser.add_option("-o", "--os", dest="os", default=None,
                      help="OS to use during burnin",
                      metavar="<OS>")
    parser.add_option("--os-size", dest="os_size", help="Disk size",
                      default=4 * 1024, type="unit", metavar="<size>")
    parser.add_option("--swap-size", dest="swap_size", help="Swap size",
                      default=4 * 1024, type="unit", metavar="<size>")
    parser.add_option("-v", "--verbose",
                      action="store_true", dest="verbose", default=False,
                      help="print command execution messages to stdout")
    parser.add_option("--no-replace1", dest="do_replace1",
                      help="Skip disk replacement with the same secondary",
                      action="store_false", default=True)
    parser.add_option("--no-replace2", dest="do_replace2",
                      help="Skip disk replacement with a different secondary",
                      action="store_false", default=True)
    parser.add_option("--no-failover", dest="do_failover",
                      help="Skip instance failovers", action="store_false",
                      default=True)
    parser.add_option("-t", "--disk-template", dest="disk_template",
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                      choices=("remote_raid1", "drbd"),
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                      default="remote_raid1",
                      help="Template type for network mirroring (remote_raid1"
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                      " or drbd) [remote_raid1]")
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    parser.add_option("-n", "--nodes", dest="nodes", default="",
                      help="Comma separated list of nodes to perform"
                      " the burnin on (defaults to all nodes)")

    options, args = parser.parse_args()
    if len(args) < 1 or options.os is None:
      Usage()

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    supported_disk_templates = (constants.DT_PLAIN, constants.DT_REMOTE_RAID1,
                                constants.DT_DRBD8)
    if options.disk_template not in supported_disk_templates:
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      Log("Unknown disk template '%s'" % options.disk_template)
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      sys.exit(1)

    self.opts = options
    self.instances = args

  def GetState(self):
    """Read the cluster state from the config."""
    if self.opts.nodes:
      names = self.opts.nodes.split(",")
    else:
      names = []
    try:
      op = opcodes.OpQueryNodes(output_fields=["name"], names=names)
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      result = self.ExecOp(op)
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    except errors.GenericError, err:
      err_code, msg = cli.FormatError(err)
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      Log(msg)
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      sys.exit(err_code)
    self.nodes = [data[0] for data in result]

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    result = self.ExecOp(opcodes.OpDiagnoseOS())
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    if not result:
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      Log("Can't get the OS list")
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      sys.exit(1)

    # filter non-valid OS-es
    oses = {}
    for node_name in result:
      oses[node_name] = [obj for obj in result[node_name] if obj]

    fnode = oses.keys()[0]
    os_set = set([os_inst.name for os_inst in oses[fnode]])
    del oses[fnode]
    for node in oses:
      os_set &= set([os_inst.name for os_inst in oses[node]])

    if self.opts.os not in os_set:
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      Log("OS '%s' not found" % self.opts.os)
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      sys.exit(1)

  def CreateInstances(self):
    """Create the given instances.

    """
    self.to_rem = []
    mytor = izip(cycle(self.nodes),
                 islice(cycle(self.nodes), 1, None),
                 self.instances)
    for pnode, snode, instance in mytor:
      op = opcodes.OpCreateInstance(instance_name=instance,
                                    mem_size=128,
                                    disk_size=self.opts.os_size,
                                    swap_size=self.opts.swap_size,
                                    disk_template=self.opts.disk_template,
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                                    mode=constants.INSTANCE_CREATE,
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                                    os_type=self.opts.os,
                                    pnode=pnode,
                                    snode=snode,
                                    vcpus=1,
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                                    start=True,
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                                    ip_check=True,
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                                    wait_for_sync=True)
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      Log("- Add instance %s on node %s" % (instance, pnode))
      self.ExecOp(op)
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      self.to_rem.append(instance)

  def ReplaceDisks1R1(self):
    """Replace disks with the same secondary for rr1."""
    # replace all, both disks
    for instance in self.instances:
      op = opcodes.OpReplaceDisks(instance_name=instance,
                                  remote_node=None,
                                  mode=constants.REPLACE_DISK_ALL,
                                  disks=["sda", "sdb"])

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      Log("- Replace disks for instance %s" % (instance))
      self.ExecOp(op)
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  def ReplaceDisks1D8(self):
    """Replace disks on primary and secondary for drbd8."""
    for instance in self.instances:
      for mode in constants.REPLACE_DISK_SEC, constants.REPLACE_DISK_PRI:
        op = opcodes.OpReplaceDisks(instance_name=instance,
                                    mode=mode,
                                    disks=["sda", "sdb"])
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        Log("- Replace disks (%s) for instance %s" % (mode, instance))
        self.ExecOp(op)
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  def ReplaceDisks2(self):
    """Replace secondary node."""
    if self.opts.disk_template == constants.DT_REMOTE_RAID1:
      mode = constants.REPLACE_DISK_ALL
    else:
      mode = constants.REPLACE_DISK_SEC

    mytor = izip(islice(cycle(self.nodes), 2, None),
                 self.instances)
    for tnode, instance in mytor:
      op = opcodes.OpReplaceDisks(instance_name=instance,
                                  mode=mode,
                                  remote_node=tnode,
                                  disks=["sda", "sdb"])
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      Log("- Replace secondary (%s) for instance %s" % (mode, instance))
      self.ExecOp(op)
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  def Failover(self):
    """Failover the instances."""

    for instance in self.instances:
      op = opcodes.OpFailoverInstance(instance_name=instance,
                                      ignore_consistency=False)

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      Log("- Failover instance %s" % (instance))
      self.ExecOp(op)
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  def StopStart(self):
    """Stop/start the instances."""
    for instance in self.instances:
      op = opcodes.OpShutdownInstance(instance_name=instance)
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      Log("- Shutdown instance %s" % instance)
      self.ExecOp(op)
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      op = opcodes.OpStartupInstance(instance_name=instance, force=False)
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      Log("- Start instance %s" % instance)
      self.ExecOp(op)
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  def Remove(self):
    """Remove the instances."""
    for instance in self.to_rem:
      op = opcodes.OpRemoveInstance(instance_name=instance)
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      Log("- Remove instance %s" % instance)
      self.ExecOp(op)
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  def BurninCluster(self):
    """Test a cluster intensively.

    This will create instances and then start/stop/failover them.
    It is safe for existing instances but could impact performance.

    """

    opts = self.opts

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    Log("- Testing global parameters")
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    if len(self.nodes) == 1 and opts.disk_template != constants.DT_PLAIN:
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      Log("When one node is available/selected the disk template must"
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               " be 'plain'")
      sys.exit(1)

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    has_err = True
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    try:
      self.CreateInstances()
      if opts.do_replace1 and opts.disk_template in constants.DTS_NET_MIRROR:
        if opts.disk_template == constants.DT_REMOTE_RAID1:
          self.ReplaceDisks1R1()
        elif opts.disk_template == constants.DT_DRBD8:
          self.ReplaceDisks1D8()
      if (opts.do_replace2 and len(self.nodes) > 2 and
          opts.disk_template in constants.DTS_NET_MIRROR) :
        self.ReplaceDisks2()

      if opts.do_failover and opts.disk_template in constants.DTS_NET_MIRROR:
        self.Failover()

      self.StopStart()
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      has_err = False
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    finally:
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      if has_err:
        Log("Error detected: opcode buffer follows:\n\n")
        Log(self.GetFeedbackBuf())
        Log("\n\n")
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      self.Remove()

    return 0
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def main():
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  """Main function"""

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  burner = Burner()
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  try:
    utils.Lock('cmd', max_retries=15, debug=True)
  except errors.LockError, err:
    logger.ToStderr(str(err))
    return 1
  try:
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    retval = burner.BurninCluster()
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  finally:
    utils.Unlock('cmd')
    utils.LockCleanup()
  return retval
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if __name__ == "__main__":
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  main()