/lib/masterd/instance.py - ganeti-local - Greek Research and Technology Network's projects

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+      #
+      #
       # Copyright (C) 2010 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.
       """Instance-related functions and classes for masterd.
       """
       import logging
       import time
       from ganeti import constants
       from ganeti import errors
       from ganeti import compat
       from ganeti import utils
       from ganeti import objects
       class _ImportExportError(Exception):
         """Local exception to report import/export errors.
         """
       class ImportExportTimeouts(object):
         #: Time until daemon starts writing status file
         DEFAULT_READY_TIMEOUT = 10
         #: Length of time until errors cause hard failure
         DEFAULT_ERROR_TIMEOUT = 10
         #: Time after which daemon must be listening
         DEFAULT_LISTEN_TIMEOUT = 10
         __slots__ = [
           "error",
           "ready",
           "listen",
           "connect",
+          ]
         def __init__(self, connect,
                      listen=DEFAULT_LISTEN_TIMEOUT,
                      error=DEFAULT_ERROR_TIMEOUT,
                      ready=DEFAULT_READY_TIMEOUT):
           """Initializes this class.
           @type connect: number
           @param connect: Timeout for establishing connection
           @type listen: number
           @param listen: Timeout for starting to listen for connections
           @type error: number
           @param error: Length of time until errors cause hard failure
           @type ready: number
           @param ready: Timeout for daemon to become ready
           """
           self.error = error
           self.ready = ready
           self.listen = listen
           self.connect = connect
       class ImportExportCbBase(object):
         """Callbacks for disk import/export.
         """
         def ReportListening(self, ie, private):
           """Called when daemon started listening.
           @type ie: Subclass of L{_DiskImportExportBase}
           @param ie: Import/export object
           @param private: Private data passed to import/export object
           """
         def ReportConnected(self, ie, private):
           """Called when a connection has been established.
           @type ie: Subclass of L{_DiskImportExportBase}
           @param ie: Import/export object
           @param private: Private data passed to import/export object
           """
         def ReportFinished(self, ie, private):
           """Called when a transfer has finished.
           @type ie: Subclass of L{_DiskImportExportBase}
           @param ie: Import/export object
           @param private: Private data passed to import/export object
           """
       def _TimeoutExpired(epoch, timeout, _time_fn=time.time):
         """Checks whether a timeout has expired.
         """
         return _time_fn() > (epoch + timeout)
       class _DiskImportExportBase(object):
         MODE_TEXT = None
         def __init__(self, lu, node_name, x509_key_name, remote_x509_ca,
                      instance, timeouts, cbs, private=None):
           """Initializes this class.
           @param lu: Logical unit instance
           @type node_name: string
           @param node_name: Node name for import
           @type x509_key_name: string
           @param x509_key_name: Name of X509 key (None for node daemon key)
           @type remote_x509_ca: string
           @param remote_x509_ca: Remote peer's CA (None for node daemon certificate)
           @type instance: L{objects.Instance}
           @param instance: Instance object
           @type timeouts: L{ImportExportTimeouts}
           @param timeouts: Timeouts for this import
           @type cbs: L{ImportExportCbBase}
           @param cbs: Callbacks
           @param private: Private data for callback functions
           """
           assert self.MODE_TEXT
           self._lu = lu
           self.node_name = node_name
           self._x509_key_name = x509_key_name
           self._remote_x509_ca = remote_x509_ca
           self._instance = instance
           self._timeouts = timeouts
           self._cbs = cbs
           self._private = private
           # Parent loop
           self._loop = None
           # Timestamps
           self._ts_begin = None
           self._ts_connected = None
           self._ts_finished = None
           self._ts_cleanup = None
           self._ts_last_error = None
           # Transfer status
           self.success = None
           self.final_message = None
           # Daemon status
           self._daemon_name = None
           self._daemon = None
         @property
         def recent_output(self):
           """Returns the most recent output from the daemon.
           """
           if self._daemon:
             return self._daemon.recent_output
           return None
         @property
         def active(self):
           """Determines whether this transport is still active.
           """
           return self.success is None
         @property
         def loop(self):
           """Returns parent loop.
           @rtype: L{ImportExportLoop}
           """
           return self._loop
         def SetLoop(self, loop):
           """Sets the parent loop.
           @type loop: L{ImportExportLoop}
           """
           if self._loop:
             raise errors.ProgrammerError("Loop can only be set once")
           self._loop = loop
         def _StartDaemon(self):
           """Starts the import/export daemon.
           """
           raise NotImplementedError()
         def CheckDaemon(self):
           """Checks whether daemon has been started and if not, starts it.
           @rtype: string
           @return: Daemon name
           """
           assert self._ts_cleanup is None
           if self._daemon_name is None:
             assert self._ts_begin is None
             result = self._StartDaemon()
             if result.fail_msg:
               raise _ImportExportError("Failed to start %s on %s: %s" %
                                        (self.MODE_TEXT, self.node_name,
                                         result.fail_msg))
             daemon_name = result.payload
             logging.info("Started %s %r on %s", self.MODE_TEXT, daemon_name,
                          self.node_name)
             self._ts_begin = time.time()
             self._daemon_name = daemon_name
           return self._daemon_name
         def GetDaemonName(self):
           """Returns the daemon name.
           """
           assert self._daemon_name, "Daemon has not been started"
           assert self._ts_cleanup is None
           return self._daemon_name
         def Abort(self):
           """Sends SIGTERM to import/export daemon (if still active).
           """
           if self._daemon_name:
             self._lu.LogWarning("Aborting %s %r on %s",
                                 self.MODE_TEXT, self._daemon_name, self.node_name)
             result = self._lu.rpc.call_impexp_abort(self.node_name, self._daemon_name)
             if result.fail_msg:
               self._lu.LogWarning("Failed to abort %s %r on %s: %s",
                                   self.MODE_TEXT, self._daemon_name,
                                   self.node_name, result.fail_msg)
               return False
           return True
         def _SetDaemonData(self, data):
           """Internal function for updating status daemon data.
           @type data: L{objects.ImportExportStatus}
           @param data: Daemon status data
           """
           assert self._ts_begin is not None
           if not data:
             if _TimeoutExpired(self._ts_begin, self._timeouts.ready):
               raise _ImportExportError("Didn't become ready after %s seconds" %
                                        self._timeouts.ready)
             return False
           self._daemon = data
           return True
         def SetDaemonData(self, success, data):
           """Updates daemon status data.
           @type success: bool
           @param success: Whether fetching data was successful or not
           @type data: L{objects.ImportExportStatus}
           @param data: Daemon status data
           """
           if not success:
             if self._ts_last_error is None:
               self._ts_last_error = time.time()
             elif _TimeoutExpired(self._ts_last_error, self._timeouts.error):
               raise _ImportExportError("Too many errors while updating data")
             return False
           self._ts_last_error = None
           return self._SetDaemonData(data)
         def CheckListening(self):
           """Checks whether the daemon is listening.
           """
           raise NotImplementedError()
         def _GetConnectedCheckEpoch(self):
           """Returns timeout to calculate connect timeout.
           """
           raise NotImplementedError()
         def CheckConnected(self):
           """Checks whether the daemon is connected.
           @rtype: bool
           @return: Whether the daemon is connected
           """
           assert self._daemon, "Daemon status missing"
           if self._ts_connected is not None:
             return True
           if self._daemon.connected:
             self._ts_connected = time.time()
             # TODO: Log remote peer
             logging.debug("%s %r on %s is now connected",
                           self.MODE_TEXT, self._daemon_name, self.node_name)
             self._cbs.ReportConnected(self, self._private)
             return True
           if _TimeoutExpired(self._GetConnectedCheckEpoch(), self._timeouts.connect):
             raise _ImportExportError("Not connected after %s seconds" %
                                      self._timeouts.connect)
           return False
         def CheckFinished(self):
           """Checks whether the daemon exited.
           @rtype: bool
           @return: Whether the transfer is finished
           """
           assert self._daemon, "Daemon status missing"
           if self._ts_finished:
             return True
           if self._daemon.exit_status is None:
             return False
           self._ts_finished = time.time()
           self._ReportFinished(self._daemon.exit_status == 0,
                                self._daemon.error_message)
           return True
         def _ReportFinished(self, success, message):
           """Transfer is finished or daemon exited.
           @type success: bool
           @param success: Whether the transfer was successful
           @type message: string
           @param message: Error message
           """
           assert self.success is None
           self.success = success
           self.final_message = message
           if success:
             logging.info("%s %r on %s succeeded", self.MODE_TEXT, self._daemon_name,
                          self.node_name)
           elif self._daemon_name:
             self._lu.LogWarning("%s %r on %s failed: %s",
                                 self.MODE_TEXT, self._daemon_name, self.node_name,
                                 message)
           else:
             self._lu.LogWarning("%s on %s failed: %s", self.MODE_TEXT,
                                 self.node_name, message)
           self._cbs.ReportFinished(self, self._private)
         def _Finalize(self):
           """Makes the RPC call to finalize this import/export.
           """
           return self._lu.rpc.call_impexp_cleanup(self.node_name, self._daemon_name)
         def Finalize(self, error=None):
           """Finalizes this import/export.
           """
           assert error or self.success is not None
           if self._daemon_name:
             logging.info("Finalizing %s %r on %s",
                          self.MODE_TEXT, self._daemon_name, self.node_name)
             result = self._Finalize()
             if result.fail_msg:
               self._lu.LogWarning("Failed to finalize %s %r on %s: %s",
                                   self.MODE_TEXT, self._daemon_name,
                                   self.node_name, result.fail_msg)
               return False
             # Daemon is no longer running
             self._daemon_name = None
             self._ts_cleanup = time.time()
           if error:
             self._ReportFinished(False, error)
           return True
       class DiskImport(_DiskImportExportBase):
         MODE_TEXT = "import"
         def __init__(self, lu, node_name, x509_key_name, source_x509_ca, instance,
                      dest, dest_args, timeouts, cbs, private=None):
           """Initializes this class.
           @param lu: Logical unit instance
           @type node_name: string
           @param node_name: Node name for import
           @type x509_key_name: string
           @param x509_key_name: Name of X509 key (None for node daemon key)
           @type source_x509_ca: string
           @param source_x509_ca: Remote peer's CA (None for node daemon certificate)
           @type instance: L{objects.Instance}
           @param instance: Instance object
           @param dest: I/O destination
           @param dest_args: I/O arguments
           @type timeouts: L{ImportExportTimeouts}
           @param timeouts: Timeouts for this import
           @type cbs: L{ImportExportCbBase}
           @param cbs: Callbacks
           @param private: Private data for callback functions
           """
           _DiskImportExportBase.__init__(self, lu, node_name,
                                          x509_key_name, source_x509_ca,
                                          instance, timeouts, cbs, private)
           self._dest = dest
           self._dest_args = dest_args
           # Timestamps
           self._ts_listening = None
         @property
         def listen_port(self):
           """Returns the port the daemon is listening on.
           """
           if self._daemon:
             return self._daemon.listen_port
           return None
         def _StartDaemon(self):
           """Starts the import daemon.
           """
           return self._lu.rpc.call_import_start(self.node_name,
                                                 self._x509_key_name,
                                                 self._remote_x509_ca, self._instance,
                                                 self._dest, self._dest_args)
         def CheckListening(self):
           """Checks whether the daemon is listening.
           @rtype: bool
           @return: Whether the daemon is listening
           """
           assert self._daemon, "Daemon status missing"
           if self._ts_listening is not None:
             return True
           port = self._daemon.listen_port
           if port is not None:
             self._ts_listening = time.time()
             logging.debug("Import %r on %s is now listening on port %s",
                           self._daemon_name, self.node_name, port)
             self._cbs.ReportListening(self, self._private)
             return True
           if _TimeoutExpired(self._ts_begin, self._timeouts.listen):
             raise _ImportExportError("Not listening after %s seconds" %
                                      self._timeouts.listen)
           return False
         def _GetConnectedCheckEpoch(self):
           """Returns the time since we started listening.
           """
           assert self._ts_listening is not None, \
                  ("Checking whether an import is connected is only useful"
                   " once it's been listening")
           return self._ts_listening
       class DiskExport(_DiskImportExportBase):
         MODE_TEXT = "export"
         def __init__(self, lu, node_name, x509_key_name, dest_x509_ca,
                      dest_host, dest_port, instance, source, source_args,
                      timeouts, cbs, private=None):
           """Initializes this class.
           @param lu: Logical unit instance
           @type node_name: string
           @param node_name: Node name for import
           @type x509_key_name: string
           @param x509_key_name: Name of X509 key (None for node daemon key)
           @type dest_x509_ca: string
           @param dest_x509_ca: Remote peer's CA (None for node daemon certificate)
           @type dest_host: string
           @param dest_host: Destination host name or IP address
           @type dest_port: number
           @param dest_port: Destination port number
           @type instance: L{objects.Instance}
           @param instance: Instance object
           @param source: I/O source
           @param source_args: I/O source
           @type timeouts: L{ImportExportTimeouts}
           @param timeouts: Timeouts for this import
           @type cbs: L{ImportExportCbBase}
           @param cbs: Callbacks
           @param private: Private data for callback functions
           """
           _DiskImportExportBase.__init__(self, lu, node_name,
                                          x509_key_name, dest_x509_ca,
                                          instance, timeouts, cbs, private)
           self._dest_host = dest_host
           self._dest_port = dest_port
           self._source = source
           self._source_args = source_args
         def _StartDaemon(self):
           """Starts the export daemon.
           """
           return self._lu.rpc.call_export_start(self.node_name, self._x509_key_name,
                                                 self._remote_x509_ca,
                                                 self._dest_host, self._dest_port,
                                                 self._instance, self._source,
                                                 self._source_args)
         def CheckListening(self):
           """Checks whether the daemon is listening.
           """
           # Only an import can be listening
           return True
         def _GetConnectedCheckEpoch(self):
           """Returns the time since the daemon started.
           """
           assert self._ts_begin is not None
           return self._ts_begin
       class ImportExportLoop:
         MIN_DELAY = 1.0
         MAX_DELAY = 20.0
         def __init__(self, lu):
           """Initializes this class.
           """
           self._lu = lu
           self._queue = []
           self._pending_add = []
         def Add(self, diskie):
           """Adds an import/export object to the loop.
           @type diskie: Subclass of L{_DiskImportExportBase}
           @param diskie: Import/export object
           """
           assert diskie not in self._pending_add
           assert diskie.loop is None
           diskie.SetLoop(self)
           # Adding new objects to a staging list is necessary, otherwise the main
           # loop gets confused if callbacks modify the queue while the main loop is
           # iterating over it.
           self._pending_add.append(diskie)
         @staticmethod
         def _CollectDaemonStatus(lu, daemons):
           """Collects the status for all import/export daemons.
           """
           daemon_status = {}
           for node_name, names in daemons.iteritems():
             result = lu.rpc.call_impexp_status(node_name, names)
             if result.fail_msg:
               lu.LogWarning("Failed to get daemon status on %s: %s",
                             node_name, result.fail_msg)
               continue
             assert len(names) == len(result.payload)
             daemon_status[node_name] = dict(zip(names, result.payload))
           return daemon_status
         @staticmethod
         def _GetActiveDaemonNames(queue):
           """Gets the names of all active daemons.
           """
           result = {}
           for diskie in queue:
             if not diskie.active:
               continue
             try:
               # Start daemon if necessary
               daemon_name = diskie.CheckDaemon()
             except _ImportExportError, err:
               logging.exception("%s failed", diskie.MODE_TEXT)
               diskie.Finalize(error=str(err))
               continue
             result.setdefault(diskie.node_name, []).append(daemon_name)
           assert len(queue) >= len(result)
           assert len(queue) >= sum([len(names) for names in result.itervalues()])
           logging.debug("daemons=%r", result)
           return result
         def _AddPendingToQueue(self):
           """Adds all pending import/export objects to the internal queue.
           """
           assert compat.all(diskie not in self._queue and diskie.loop == self
                             for diskie in self._pending_add)
           self._queue.extend(self._pending_add)
           del self._pending_add[:]
         def Run(self):
           """Utility main loop.
           """
           while True:
             self._AddPendingToQueue()
             # Collect all active daemon names
             daemons = self._GetActiveDaemonNames(self._queue)
             if not daemons:
               break
             # Collection daemon status data
             data = self._CollectDaemonStatus(self._lu, daemons)
             # Use data
             delay = self.MAX_DELAY
             for diskie in self._queue:
               if not diskie.active:
                 continue
               try:
                 try:
                   all_daemon_data = data[diskie.node_name]
                 except KeyError:
                   result = diskie.SetDaemonData(False, None)
                 else:
                   result = \
                     diskie.SetDaemonData(True,
                                          all_daemon_data[diskie.GetDaemonName()])
                 if not result:
                   # Daemon not yet ready, retry soon
                   delay = min(3.0, delay)
                   continue
                 if diskie.CheckFinished():
                   # Transfer finished
                   diskie.Finalize()
                   continue
                 # Normal case: check again in 5 seconds
                 delay = min(5.0, delay)
                 if not diskie.CheckListening():
                   # Not yet listening, retry soon
                   delay = min(1.0, delay)
                   continue
                 if not diskie.CheckConnected():
                   # Not yet connected, retry soon
                   delay = min(1.0, delay)
                   continue
               except _ImportExportError, err:
                 logging.exception("%s failed", diskie.MODE_TEXT)
                 diskie.Finalize(error=str(err))
             if not compat.any([diskie.active for diskie in self._queue]):
               break
             # Wait a bit
             delay = min(self.MAX_DELAY, max(self.MIN_DELAY, delay))
             logging.debug("Waiting for %ss", delay)
             time.sleep(delay)
         def FinalizeAll(self):
           """Finalizes all pending transfers.
           """
           success = True
           for diskie in self._queue:
             success = diskie.Finalize() and success
           return success
       class _TransferInstCbBase(ImportExportCbBase):
         def __init__(self, lu, feedback_fn, instance, timeouts, src_node, src_cbs,
                      dest_node, dest_ip):
           """Initializes this class.
           """
           ImportExportCbBase.__init__(self)
           self.lu = lu
           self.feedback_fn = feedback_fn
           self.instance = instance
           self.timeouts = timeouts
           self.src_node = src_node
           self.src_cbs = src_cbs
           self.dest_node = dest_node
           self.dest_ip = dest_ip
       class _TransferInstSourceCb(_TransferInstCbBase):
         def ReportConnected(self, ie, dtp):
           """Called when a connection has been established.
           """
           assert self.src_cbs is None
           assert dtp.src_export == ie
           assert dtp.dest_import
           self.feedback_fn("%s is sending data on %s" %
                            (dtp.data.name, ie.node_name))
         def ReportFinished(self, ie, dtp):
           """Called when a transfer has finished.
           """
           assert self.src_cbs is None
           assert dtp.src_export == ie
           assert dtp.dest_import
           if ie.success:
             self.feedback_fn("%s finished sending data" % dtp.data.name)
           else:
             self.feedback_fn("%s failed to send data: %s (recent output: %r)" %
                              (dtp.data.name, ie.final_message, ie.recent_output))
           dtp.RecordResult(ie.success)
           cb = dtp.data.finished_fn
           if cb:
             cb()
           # TODO: Check whether sending SIGTERM right away is okay, maybe we should
           # give the daemon a moment to sort things out
           if dtp.dest_import and not ie.success:
             dtp.dest_import.Abort()
       class _TransferInstDestCb(_TransferInstCbBase):
         def ReportListening(self, ie, dtp):
           """Called when daemon started listening.
           """
           assert self.src_cbs
           assert dtp.src_export is None
           assert dtp.dest_import
           self.feedback_fn("%s is now listening, starting export" % dtp.data.name)
           # Start export on source node
           de = DiskExport(self.lu, self.src_node, None, None, self.dest_ip,
                           ie.listen_port, self.instance,
                           dtp.data.src_io, dtp.data.src_ioargs,
                           self.timeouts, self.src_cbs, private=dtp)
           ie.loop.Add(de)
           dtp.src_export = de
         def ReportConnected(self, ie, dtp):
           """Called when a connection has been established.
           """
           self.feedback_fn("%s is receiving data on %s" %
                            (dtp.data.name, self.dest_node))
         def ReportFinished(self, ie, dtp):
           """Called when a transfer has finished.
           """
           if ie.success:
             self.feedback_fn("%s finished receiving data" % dtp.data.name)
           else:
             self.feedback_fn("%s failed to receive data: %s (recent output: %r)" %
                              (dtp.data.name, ie.final_message, ie.recent_output))
           dtp.RecordResult(ie.success)
           # TODO: Check whether sending SIGTERM right away is okay, maybe we should
           # give the daemon a moment to sort things out
           if dtp.src_export and not ie.success:
             dtp.src_export.Abort()
       class DiskTransfer(object):
         def __init__(self, name, src_io, src_ioargs, dest_io, dest_ioargs,
                      finished_fn):
           """Initializes this class.
           @type name: string
           @param name: User-visible name for this transfer (e.g. "disk/0")
           @param src_io: Source I/O type
           @param src_ioargs: Source I/O arguments
           @param dest_io: Destination I/O type
           @param dest_ioargs: Destination I/O arguments
           @type finished_fn: callable
           @param finished_fn: Function called once transfer has finished
           """
           self.name = name
           self.src_io = src_io
           self.src_ioargs = src_ioargs
           self.dest_io = dest_io
           self.dest_ioargs = dest_ioargs
           self.finished_fn = finished_fn
       class _DiskTransferPrivate(object):
         def __init__(self, data, success):
           """Initializes this class.
           @type data: L{DiskTransfer}
           @type success: bool
           """
           self.data = data
           self.src_export = None
           self.dest_import = None
           self.success = success
         def RecordResult(self, success):
           """Updates the status.
           One failed part will cause the whole transfer to fail.
           """
           self.success = self.success and success
       def TransferInstanceData(lu, feedback_fn, src_node, dest_node, dest_ip,
                                instance, all_transfers):
         """Transfers an instance's data from one node to another.
         @param lu: Logical unit instance
         @param feedback_fn: Feedback function
         @type src_node: string
         @param src_node: Source node name
         @type dest_node: string
         @param dest_node: Destination node name
         @type dest_ip: string
         @param dest_ip: IP address of destination node
         @type instance: L{objects.Instance}
         @param instance: Instance object
         @type all_transfers: list of L{DiskTransfer} instances
         @param all_transfers: List of all disk transfers to be made
         @rtype: list
         @return: List with a boolean (True=successful, False=failed) for success for
                  each transfer
         """
         timeouts = ImportExportTimeouts(constants.DISK_TRANSFER_CONNECT_TIMEOUT)
         src_cbs = _TransferInstSourceCb(lu, feedback_fn, instance, timeouts,
                                         src_node, None, dest_node, dest_ip)
         dest_cbs = _TransferInstDestCb(lu, feedback_fn, instance, timeouts,
                                        src_node, src_cbs, dest_node, dest_ip)
         all_dtp = []
         ieloop = ImportExportLoop(lu)
         try:
           for transfer in all_transfers:
             if transfer:
               feedback_fn("Exporting %s from %s to %s" %
                           (transfer.name, src_node, dest_node))
               dtp = _DiskTransferPrivate(transfer, True)
               di = DiskImport(lu, dest_node, None, None, instance,
                               transfer.dest_io, transfer.dest_ioargs,
                               timeouts, dest_cbs, private=dtp)
               ieloop.Add(di)
               dtp.dest_import = di
             else:
               dtp = _DiskTransferPrivate(None, False)
             all_dtp.append(dtp)
           ieloop.Run()
         finally:
           ieloop.FinalizeAll()
         assert len(all_dtp) == len(all_transfers)
         assert compat.all([(dtp.src_export is None or
                             dtp.src_export.success is not None) and
                            (dtp.dest_import is None or
                             dtp.dest_import.success is not None)
                            for dtp in all_dtp]), \
                "Not all imports/exports are finalized"
         return [bool(dtp.success) for dtp in all_dtp]
       class ExportInstanceHelper:
         def __init__(self, lu, feedback_fn, instance):
           """Initializes this class.
           @param lu: Logical unit instance
           @param feedback_fn: Feedback function
           @type instance: L{objects.Instance}
           @param instance: Instance object
           """
           self._lu = lu
           self._feedback_fn = feedback_fn
           self._instance = instance
           self._snap_disks = []
           self._removed_snaps = [False] * len(instance.disks)
         def CreateSnapshots(self):
           """Creates an LVM snapshot for every disk of the instance.
           """
           assert not self._snap_disks
           instance = self._instance
           src_node = instance.primary_node
           vgname = self._lu.cfg.GetVGName()
           for idx, disk in enumerate(instance.disks):
             self._feedback_fn("Creating a snapshot of disk/%s on node %s" %
                               (idx, src_node))
             # result.payload will be a snapshot of an lvm leaf of the one we
             # passed
             result = self._lu.rpc.call_blockdev_snapshot(src_node, disk)
             msg = result.fail_msg
             if msg:
               self._lu.LogWarning("Could not snapshot disk/%s on node %s: %s",
                                   idx, src_node, msg)
               new_dev = False
             else:
               disk_id = (vgname, result.payload)
               new_dev = objects.Disk(dev_type=constants.LD_LV, size=disk.size,
                                      logical_id=disk_id, physical_id=disk_id,
                                      iv_name=disk.iv_name)
             self._snap_disks.append(new_dev)
           assert len(self._snap_disks) == len(instance.disks)
           assert len(self._removed_snaps) == len(instance.disks)
         def _RemoveSnapshot(self, disk_index):
           """Removes an LVM snapshot.
           @type disk_index: number
           @param disk_index: Index of the snapshot to be removed
           """
           disk = self._snap_disks[disk_index]
           if disk and not self._removed_snaps[disk_index]:
             src_node = self._instance.primary_node
             self._feedback_fn("Removing snapshot of disk/%s on node %s" %
                               (disk_index, src_node))
             result = self._lu.rpc.call_blockdev_remove(src_node, disk)
             if result.fail_msg:
               self._lu.LogWarning("Could not remove snapshot for disk/%d from node"
                                   " %s: %s", disk_index, src_node, result.fail_msg)
             else:
               self._removed_snaps[disk_index] = True
         def LocalExport(self, dest_node):
           """Intra-cluster instance export.
           @type dest_node: L{objects.Node}
           @param dest_node: Destination node
           """
           instance = self._instance
           src_node = instance.primary_node
           assert len(self._snap_disks) == len(instance.disks)
           transfers = []
           for idx, dev in enumerate(self._snap_disks):
             if not dev:
               transfers.append(None)
               continue
             path = utils.PathJoin(constants.EXPORT_DIR, "%s.new" % instance.name,
                                   dev.physical_id[1])
             finished_fn = compat.partial(self._TransferFinished, idx)
             # FIXME: pass debug option from opcode to backend
             dt = DiskTransfer("snapshot/%s" % idx,
                               constants.IEIO_SCRIPT, (dev, idx),
                               constants.IEIO_FILE, (path, ),
                               finished_fn)
             transfers.append(dt)
           # Actually export data
           dresults = TransferInstanceData(self._lu, self._feedback_fn,
                                           src_node, dest_node.name,
                                           dest_node.secondary_ip,
                                           instance, transfers)
           assert len(dresults) == len(instance.disks)
           self._feedback_fn("Finalizing export on %s" % dest_node.name)
           result = self._lu.rpc.call_finalize_export(dest_node.name, instance,
                                                      self._snap_disks)
           msg = result.fail_msg
           fin_resu = not msg
           if msg:
             self._lu.LogWarning("Could not finalize export for instance %s"
                                 " on node %s: %s", instance.name, dest_node.name, msg)
           return (fin_resu, dresults)
         def _TransferFinished(self, idx):
           """Called once a transfer has finished.
           @type idx: number
           @param idx: Disk index
           """
           logging.debug("Transfer %s finished", idx)
           self._RemoveSnapshot(idx)
         def Cleanup(self):
           """Remove all snapshots.
           """
           assert len(self._removed_snaps) == len(self._instance.disks)
           for idx in range(len(self._instance.disks)):
             self._RemoveSnapshot(idx)
       def _GetImportExportHandshakeMessage(version):
         """Returns the handshake message for a RIE protocol version.
         @type version: number
         """
         return "%s:%s" % (version, constants.RIE_HANDSHAKE)
       def ComputeRemoteExportHandshake(cds):
         """Computes the remote import/export handshake.
         @type cds: string
         @param cds: Cluster domain secret
         """
         salt = utils.GenerateSecret(8)
         msg = _GetImportExportHandshakeMessage(constants.RIE_VERSION)
         return (constants.RIE_VERSION, utils.Sha1Hmac(cds, msg, salt=salt), salt)
       def CheckRemoteExportHandshake(cds, handshake):
         """Checks the handshake of a remote import/export.
         @type cds: string
         @param cds: Cluster domain secret
         @type handshake: sequence
         @param handshake: Handshake sent by remote peer
         """
         try:
           (version, hmac_digest, hmac_salt) = handshake
         except (TypeError, ValueError), err:
           return "Invalid data: %s" % err
         if not utils.VerifySha1Hmac(cds, _GetImportExportHandshakeMessage(version),
                                     hmac_digest, salt=hmac_salt):
           return "Hash didn't match, clusters don't share the same domain secret"
         if version != constants.RIE_VERSION:
           return ("Clusters don't have the same remote import/export protocol"
                   " (local=%s, remote=%s)" %
                   (constants.RIE_VERSION, version))
         return None

Synnefo » snf-ganeti » ganeti-local

root / lib / masterd / instance.py @ 1410fa8d