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#!/usr/bin/python
#

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"""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 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)

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

  """
  print msg
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class Burner(object):
  """Burner class."""

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

  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",
                      choices=("remote_raid1", "drbd8"),
                      default="remote_raid1",
                      help="Template type for network mirroring (remote_raid1"
                      " or drbd8) [remote_raid1]")
    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()

    if options.disk_template == "plain":
      disk_template = constants.DT_PLAIN
    elif options.disk_template == "remote_raid1":
      disk_template = constants.DT_REMOTE_RAID1
    elif options.disk_template == "drbd8":
      disk_template = constants.DT_DRBD8
    else:
      Feedback("Unknown disk template '%s'" % options.disk_template)
      sys.exit(1)

    options.disk_template = disk_template
    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)
      result = self.proc.ExecOpCode(op)
    except errors.GenericError, err:
      err_code, msg = cli.FormatError(err)
      Feedback(msg)
      sys.exit(err_code)
    self.nodes = [data[0] for data in result]

    result = self.proc.ExecOpCode(opcodes.OpDiagnoseOS())

    if not result:
      Feedback("Can't get the OS list")
      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:
      Feedback("OS '%s' not found" % self.opts.os)
      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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      Feedback("- Add instance %s on node %s" % (instance, pnode))
      self.proc.ExecOpCode(op)
      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"])

      Feedback("- Replace disks for instance %s" % (instance))
      self.proc.ExecOpCode(op)

  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"])
        Feedback("- Replace disks (%s) for instance %s" % (mode, instance))
        self.proc.ExecOpCode(op)

  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"])
      Feedback("- Replace secondary (%s) for instance %s" % (mode, instance))
      self.proc.ExecOpCode(op)

  def Failover(self):
    """Failover the instances."""

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

      Feedback("- Failover instance %s" % (instance))
      self.proc.ExecOpCode(op)

  def StopStart(self):
    """Stop/start the instances."""
    for instance in self.instances:
      op = opcodes.OpShutdownInstance(instance_name=instance)
      Feedback("- Shutdown instance %s" % instance)
      self.proc.ExecOpCode(op)
      op = opcodes.OpStartupInstance(instance_name=instance, force=False)
      Feedback("- Start instance %s" % instance)
      self.proc.ExecOpCode(op)

  def Remove(self):
    """Remove the instances."""
    for instance in self.to_rem:
      op = opcodes.OpRemoveInstance(instance_name=instance)
      Feedback("- Remove instance %s" % instance)
      self.proc.ExecOpCode(op)

  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

    Feedback("- Testing global parameters")

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

    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()

    finally:
      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()