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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.
       """Ganeti node daemon"""
       # pylint: disable-msg=C0103,W0142
       # C0103: Functions in this module need to have a given name structure,
       # and the name of the daemon doesn't match
       # W0142: Used * or ** magic, since we do use it extensively in this
       # module
       import os
       import sys
       import logging
       import signal
       from optparse import OptionParser
       from ganeti import backend
       from ganeti import constants
       from ganeti import objects
       from ganeti import errors
       from ganeti import jstore
       from ganeti import daemon
       from ganeti import http
       from ganeti import utils
       from ganeti import storage
       from ganeti import serializer
       import ganeti.http.server # pylint: disable-msg=W0611
       queue_lock = None
       def _PrepareQueueLock():
         """Try to prepare the queue lock.
         @return: None for success, otherwise an exception object
         """
         global queue_lock # pylint: disable-msg=W0603
         if queue_lock is not None:
           return None
         # Prepare job queue
         try:
           queue_lock = jstore.InitAndVerifyQueue(must_lock=False)
           return None
         except EnvironmentError, err:
           return err
       def _RequireJobQueueLock(fn):
         """Decorator for job queue manipulating functions.
         """
         QUEUE_LOCK_TIMEOUT = 10
         def wrapper(*args, **kwargs):
           # Locking in exclusive, blocking mode because there could be several
           # children running at the same time. Waiting up to 10 seconds.
           if _PrepareQueueLock() is not None:
             raise errors.JobQueueError("Job queue failed initialization,"
                                        " cannot update jobs")
           queue_lock.Exclusive(blocking=True, timeout=QUEUE_LOCK_TIMEOUT)
           try:
             return fn(*args, **kwargs)
           finally:
             queue_lock.Unlock()
         return wrapper
       def _DecodeImportExportIO(ieio, ieioargs):
         """Decodes import/export I/O information.
         """
         if ieio == constants.IEIO_RAW_DISK:
           assert len(ieioargs) == 1
           return (objects.Disk.FromDict(ieioargs[0]), )
         if ieio == constants.IEIO_SCRIPT:
           assert len(ieioargs) == 2
           return (objects.Disk.FromDict(ieioargs[0]), ieioargs[1])
         return ieioargs
       class MlockallRequestExecutor(http.server.HttpServerRequestExecutor):
         """Custom Request Executor class that ensures NodeHttpServer children are
         locked in ram.
         """
         def __init__(self, *args, **kwargs):
           utils.Mlockall()
           http.server.HttpServerRequestExecutor.__init__(self, *args, **kwargs)
       class NodeHttpServer(http.server.HttpServer):
         """The server implementation.
         This class holds all methods exposed over the RPC interface.
         """
         # too many public methods, and unused args - all methods get params
         # due to the API
         # pylint: disable-msg=R0904,W0613
         def __init__(self, *args, **kwargs):
           http.server.HttpServer.__init__(self, *args, **kwargs)
           self.noded_pid = os.getpid()
         def HandleRequest(self, req):
           """Handle a request.
           """
           if req.request_method.upper() != http.HTTP_PUT:
             raise http.HttpBadRequest()
           path = req.request_path
           if path.startswith("/"):
             path = path[1:]
           method = getattr(self, "perspective_%s" % path, None)
           if method is None:
             raise http.HttpNotFound()
           try:
             result = (True, method(serializer.LoadJson(req.request_body)))
           except backend.RPCFail, err:
             # our custom failure exception; str(err) works fine if the
             # exception was constructed with a single argument, and in
             # this case, err.message == err.args[0] == str(err)
             result = (False, str(err))
           except errors.QuitGanetiException, err:
             # Tell parent to quit
             logging.info("Shutting down the node daemon, arguments: %s",
                          str(err.args))
             os.kill(self.noded_pid, signal.SIGTERM)
             # And return the error's arguments, which must be already in
             # correct tuple format
             result = err.args
           except Exception, err:
             logging.exception("Error in RPC call")
             result = (False, "Error while executing backend function: %s" % str(err))
           return serializer.DumpJson(result, indent=False)
         # the new block devices  --------------------------
         @staticmethod
         def perspective_blockdev_create(params):
           """Create a block device.
           """
           bdev_s, size, owner, on_primary, info = params
           bdev = objects.Disk.FromDict(bdev_s)
           if bdev is None:
             raise ValueError("can't unserialize data!")
           return backend.BlockdevCreate(bdev, size, owner, on_primary, info)
         @staticmethod
         def perspective_blockdev_remove(params):
           """Remove a block device.
           """
           bdev_s = params[0]
           bdev = objects.Disk.FromDict(bdev_s)
           return backend.BlockdevRemove(bdev)
         @staticmethod
         def perspective_blockdev_rename(params):
           """Remove a block device.
           """
           devlist = [(objects.Disk.FromDict(ds), uid) for ds, uid in params]
           return backend.BlockdevRename(devlist)
         @staticmethod
         def perspective_blockdev_assemble(params):
           """Assemble a block device.
           """
           bdev_s, owner, on_primary = params
           bdev = objects.Disk.FromDict(bdev_s)
           if bdev is None:
             raise ValueError("can't unserialize data!")
           return backend.BlockdevAssemble(bdev, owner, on_primary)
         @staticmethod
         def perspective_blockdev_shutdown(params):
           """Shutdown a block device.
           """
           bdev_s = params[0]
           bdev = objects.Disk.FromDict(bdev_s)
           if bdev is None:
             raise ValueError("can't unserialize data!")
           return backend.BlockdevShutdown(bdev)
         @staticmethod
         def perspective_blockdev_addchildren(params):
           """Add a child to a mirror device.
           Note: this is only valid for mirror devices. It's the caller's duty
           to send a correct disk, otherwise we raise an error.
           """
           bdev_s, ndev_s = params
           bdev = objects.Disk.FromDict(bdev_s)
           ndevs = [objects.Disk.FromDict(disk_s) for disk_s in ndev_s]
           if bdev is None or ndevs.count(None) > 0:
             raise ValueError("can't unserialize data!")
           return backend.BlockdevAddchildren(bdev, ndevs)
         @staticmethod
         def perspective_blockdev_removechildren(params):
           """Remove a child from a mirror device.
           This is only valid for mirror devices, of course. It's the callers
           duty to send a correct disk, otherwise we raise an error.
           """
           bdev_s, ndev_s = params
           bdev = objects.Disk.FromDict(bdev_s)
           ndevs = [objects.Disk.FromDict(disk_s) for disk_s in ndev_s]
           if bdev is None or ndevs.count(None) > 0:
             raise ValueError("can't unserialize data!")
           return backend.BlockdevRemovechildren(bdev, ndevs)
         @staticmethod
         def perspective_blockdev_getmirrorstatus(params):
           """Return the mirror status for a list of disks.
           """
           disks = [objects.Disk.FromDict(dsk_s)
                    for dsk_s in params]
           return [status.ToDict()
                   for status in backend.BlockdevGetmirrorstatus(disks)]
         @staticmethod
         def perspective_blockdev_find(params):
           """Expose the FindBlockDevice functionality for a disk.
           This will try to find but not activate a disk.
           """
           disk = objects.Disk.FromDict(params[0])
           result = backend.BlockdevFind(disk)
           if result is None:
             return None
           return result.ToDict()
         @staticmethod
         def perspective_blockdev_snapshot(params):
           """Create a snapshot device.
           Note that this is only valid for LVM disks, if we get passed
           something else we raise an exception. The snapshot device can be
           remove by calling the generic block device remove call.
           """
           cfbd = objects.Disk.FromDict(params[0])
           return backend.BlockdevSnapshot(cfbd)
         @staticmethod
         def perspective_blockdev_grow(params):
           """Grow a stack of devices.
           """
           cfbd = objects.Disk.FromDict(params[0])
           amount = params[1]
           return backend.BlockdevGrow(cfbd, amount)
         @staticmethod
         def perspective_blockdev_close(params):
           """Closes the given block devices.
           """
           disks = [objects.Disk.FromDict(cf) for cf in params[1]]
           return backend.BlockdevClose(params[0], disks)
         @staticmethod
         def perspective_blockdev_getsize(params):
           """Compute the sizes of the given block devices.
           """
           disks = [objects.Disk.FromDict(cf) for cf in params[0]]
           return backend.BlockdevGetsize(disks)
         @staticmethod
         def perspective_blockdev_export(params):
           """Compute the sizes of the given block devices.
           """
           disk = objects.Disk.FromDict(params[0])
           dest_node, dest_path, cluster_name = params[1:]
           return backend.BlockdevExport(disk, dest_node, dest_path, cluster_name)
         # blockdev/drbd specific methods ----------
         @staticmethod
         def perspective_drbd_disconnect_net(params):
           """Disconnects the network connection of drbd disks.
           Note that this is only valid for drbd disks, so the members of the
           disk list must all be drbd devices.
           """
           nodes_ip, disks = params
           disks = [objects.Disk.FromDict(cf) for cf in disks]
           return backend.DrbdDisconnectNet(nodes_ip, disks)
         @staticmethod
         def perspective_drbd_attach_net(params):
           """Attaches the network connection of drbd disks.
           Note that this is only valid for drbd disks, so the members of the
           disk list must all be drbd devices.
           """
           nodes_ip, disks, instance_name, multimaster = params
           disks = [objects.Disk.FromDict(cf) for cf in disks]
           return backend.DrbdAttachNet(nodes_ip, disks,
                                            instance_name, multimaster)
         @staticmethod
         def perspective_drbd_wait_sync(params):
           """Wait until DRBD disks are synched.
           Note that this is only valid for drbd disks, so the members of the
           disk list must all be drbd devices.
           """
           nodes_ip, disks = params
           disks = [objects.Disk.FromDict(cf) for cf in disks]
           return backend.DrbdWaitSync(nodes_ip, disks)
         # export/import  --------------------------
         @staticmethod
         def perspective_finalize_export(params):
           """Expose the finalize export functionality.
           """
           instance = objects.Instance.FromDict(params[0])
           snap_disks = []
           for disk in params[1]:
             if isinstance(disk, bool):
               snap_disks.append(disk)
             else:
               snap_disks.append(objects.Disk.FromDict(disk))
           return backend.FinalizeExport(instance, snap_disks)
         @staticmethod
         def perspective_export_info(params):
           """Query information about an existing export on this node.
           The given path may not contain an export, in which case we return
           None.
           """
           path = params[0]
           return backend.ExportInfo(path)
         @staticmethod
         def perspective_export_list(params):
           """List the available exports on this node.
           Note that as opposed to export_info, which may query data about an
           export in any path, this only queries the standard Ganeti path
           (constants.EXPORT_DIR).
           """
           return backend.ListExports()
         @staticmethod
         def perspective_export_remove(params):
           """Remove an export.
           """
           export = params[0]
           return backend.RemoveExport(export)
         # volume  --------------------------
         @staticmethod
         def perspective_lv_list(params):
           """Query the list of logical volumes in a given volume group.
           """
           vgname = params[0]
           return backend.GetVolumeList(vgname)
         @staticmethod
         def perspective_vg_list(params):
           """Query the list of volume groups.
           """
           return backend.ListVolumeGroups()
         # Storage --------------------------
         @staticmethod
         def perspective_storage_list(params):
           """Get list of storage units.
           """
           (su_name, su_args, name, fields) = params
           return storage.GetStorage(su_name, *su_args).List(name, fields)
         @staticmethod
         def perspective_storage_modify(params):
           """Modify a storage unit.
           """
           (su_name, su_args, name, changes) = params
           return storage.GetStorage(su_name, *su_args).Modify(name, changes)
         @staticmethod
         def perspective_storage_execute(params):
           """Execute an operation on a storage unit.
           """
           (su_name, su_args, name, op) = params
           return storage.GetStorage(su_name, *su_args).Execute(name, op)
         # bridge  --------------------------
         @staticmethod
         def perspective_bridges_exist(params):
           """Check if all bridges given exist on this node.
           """
           bridges_list = params[0]
           return backend.BridgesExist(bridges_list)
         # instance  --------------------------
         @staticmethod
         def perspective_instance_os_add(params):
           """Install an OS on a given instance.
           """
           inst_s = params[0]
           inst = objects.Instance.FromDict(inst_s)
           reinstall = params[1]
           debug = params[2]
           return backend.InstanceOsAdd(inst, reinstall, debug)
         @staticmethod
         def perspective_instance_run_rename(params):
           """Runs the OS rename script for an instance.
           """
           inst_s, old_name, debug = params
           inst = objects.Instance.FromDict(inst_s)
           return backend.RunRenameInstance(inst, old_name, debug)
         @staticmethod
         def perspective_instance_shutdown(params):
           """Shutdown an instance.
           """
           instance = objects.Instance.FromDict(params[0])
           timeout = params[1]
           return backend.InstanceShutdown(instance, timeout)
         @staticmethod
         def perspective_instance_start(params):
           """Start an instance.
           """
           instance = objects.Instance.FromDict(params[0])
           return backend.StartInstance(instance)
         @staticmethod
         def perspective_migration_info(params):
           """Gather information about an instance to be migrated.
           """
           instance = objects.Instance.FromDict(params[0])
           return backend.MigrationInfo(instance)
         @staticmethod
         def perspective_accept_instance(params):
           """Prepare the node to accept an instance.
           """
           instance, info, target = params
           instance = objects.Instance.FromDict(instance)
           return backend.AcceptInstance(instance, info, target)
         @staticmethod
         def perspective_finalize_migration(params):
           """Finalize the instance migration.
           """
           instance, info, success = params
           instance = objects.Instance.FromDict(instance)
           return backend.FinalizeMigration(instance, info, success)
         @staticmethod
         def perspective_instance_migrate(params):
           """Migrates an instance.
           """
           instance, target, live = params
           instance = objects.Instance.FromDict(instance)
           return backend.MigrateInstance(instance, target, live)
         @staticmethod
         def perspective_instance_reboot(params):
           """Reboot an instance.
           """
           instance = objects.Instance.FromDict(params[0])
           reboot_type = params[1]
           shutdown_timeout = params[2]
           return backend.InstanceReboot(instance, reboot_type, shutdown_timeout)
         @staticmethod
         def perspective_instance_info(params):
           """Query instance information.
           """
           return backend.GetInstanceInfo(params[0], params[1])
         @staticmethod
         def perspective_instance_migratable(params):
           """Query whether the specified instance can be migrated.
           """
           instance = objects.Instance.FromDict(params[0])
           return backend.GetInstanceMigratable(instance)
         @staticmethod
         def perspective_all_instances_info(params):
           """Query information about all instances.
           """
           return backend.GetAllInstancesInfo(params[0])
         @staticmethod
         def perspective_instance_list(params):
           """Query the list of running instances.
           """
           return backend.GetInstanceList(params[0])
         # node --------------------------
         @staticmethod
         def perspective_node_tcp_ping(params):
           """Do a TcpPing on the remote node.
           """
           return utils.TcpPing(params[1], params[2], timeout=params[3],
                                live_port_needed=params[4], source=params[0])
         @staticmethod
         def perspective_node_has_ip_address(params):
           """Checks if a node has the given ip address.
           """
           return utils.OwnIpAddress(params[0])
         @staticmethod
         def perspective_node_info(params):
           """Query node information.
           """
           vgname, hypervisor_type = params
           return backend.GetNodeInfo(vgname, hypervisor_type)
         @staticmethod
         def perspective_node_add(params):
           """Complete the registration of this node in the cluster.
           """
           return backend.AddNode(params[0], params[1], params[2],
                                  params[3], params[4], params[5])
         @staticmethod
         def perspective_node_verify(params):
           """Run a verify sequence on this node.
           """
           return backend.VerifyNode(params[0], params[1])
         @staticmethod
         def perspective_node_start_master(params):
           """Promote this node to master status.
           """
           return backend.StartMaster(params[0], params[1])
         @staticmethod
         def perspective_node_stop_master(params):
           """Demote this node from master status.
           """
           return backend.StopMaster(params[0])
         @staticmethod
         def perspective_node_leave_cluster(params):
           """Cleanup after leaving a cluster.
           """
           return backend.LeaveCluster(params[0])
         @staticmethod
         def perspective_node_volumes(params):
           """Query the list of all logical volume groups.
           """
           return backend.NodeVolumes()
         @staticmethod
         def perspective_node_demote_from_mc(params):
           """Demote a node from the master candidate role.
           """
           return backend.DemoteFromMC()
         @staticmethod
         def perspective_node_powercycle(params):
           """Tries to powercycle the nod.
           """
           hypervisor_type = params[0]
           return backend.PowercycleNode(hypervisor_type)
         # cluster --------------------------
         @staticmethod
         def perspective_version(params):
           """Query version information.
           """
           return constants.PROTOCOL_VERSION
         @staticmethod
         def perspective_upload_file(params):
           """Upload a file.
           Note that the backend implementation imposes strict rules on which
           files are accepted.
           """
           return backend.UploadFile(*params)
         @staticmethod
         def perspective_master_info(params):
           """Query master information.
           """
           return backend.GetMasterInfo()
         @staticmethod
         def perspective_write_ssconf_files(params):
           """Write ssconf files.
           """
           (values,) = params
           return backend.WriteSsconfFiles(values)
         # os -----------------------
         @staticmethod
         def perspective_os_diagnose(params):
           """Query detailed information about existing OSes.
           """
           return backend.DiagnoseOS()
         @staticmethod
         def perspective_os_get(params):
           """Query information about a given OS.
           """
           name = params[0]
           os_obj = backend.OSFromDisk(name)
           return os_obj.ToDict()
         # hooks -----------------------
         @staticmethod
         def perspective_hooks_runner(params):
           """Run hook scripts.
           """
           hpath, phase, env = params
           hr = backend.HooksRunner()
           return hr.RunHooks(hpath, phase, env)
         # iallocator -----------------
         @staticmethod
         def perspective_iallocator_runner(params):
           """Run an iallocator script.
           """
           name, idata = params
           iar = backend.IAllocatorRunner()
           return iar.Run(name, idata)
         # test -----------------------
         @staticmethod
         def perspective_test_delay(params):
           """Run test delay.
           """
           duration = params[0]
           status, rval = utils.TestDelay(duration)
           if not status:
             raise backend.RPCFail(rval)
           return rval
         # file storage ---------------
         @staticmethod
         def perspective_file_storage_dir_create(params):
           """Create the file storage directory.
           """
           file_storage_dir = params[0]
           return backend.CreateFileStorageDir(file_storage_dir)
         @staticmethod
         def perspective_file_storage_dir_remove(params):
           """Remove the file storage directory.
           """
           file_storage_dir = params[0]
           return backend.RemoveFileStorageDir(file_storage_dir)
         @staticmethod
         def perspective_file_storage_dir_rename(params):
           """Rename the file storage directory.
           """
           old_file_storage_dir = params[0]
           new_file_storage_dir = params[1]
           return backend.RenameFileStorageDir(old_file_storage_dir,
                                               new_file_storage_dir)
         # jobs ------------------------
         @staticmethod
         @_RequireJobQueueLock
         def perspective_jobqueue_update(params):
           """Update job queue.
           """
           (file_name, content) = params
           return backend.JobQueueUpdate(file_name, content)
         @staticmethod
         @_RequireJobQueueLock
         def perspective_jobqueue_purge(params):
           """Purge job queue.
           """
           return backend.JobQueuePurge()
         @staticmethod
         @_RequireJobQueueLock
         def perspective_jobqueue_rename(params):
           """Rename a job queue file.
           """
           # TODO: What if a file fails to rename?
           return [backend.JobQueueRename(old, new) for old, new in params]
         # hypervisor ---------------
         @staticmethod
         def perspective_hypervisor_validate_params(params):
           """Validate the hypervisor parameters.
           """
           (hvname, hvparams) = params
           return backend.ValidateHVParams(hvname, hvparams)
         # Crypto
         @staticmethod
         def perspective_x509_cert_create(params):
           """Creates a new X509 certificate for SSL/TLS.
           """
           (validity, ) = params
           return backend.CreateX509Certificate(validity)
         @staticmethod
         def perspective_x509_cert_remove(params):
           """Removes a X509 certificate.
           """
           (name, ) = params
           return backend.RemoveX509Certificate(name)
         # Import and export
         @staticmethod
         def perspective_import_start(params):
           """Starts an import daemon.
           """
           (opts_s, instance, dest, dest_args) = params
           opts = objects.ImportExportOptions.FromDict(opts_s)
           return backend.StartImportExportDaemon(constants.IEM_IMPORT, opts,
                                                  None, None,
                                                  objects.Instance.FromDict(instance),
                                                  dest,
                                                  _DecodeImportExportIO(dest,
                                                                        dest_args))
         @staticmethod
         def perspective_export_start(params):
           """Starts an export daemon.
           """
           (opts_s, host, port, instance, source, source_args) = params
           opts = objects.ImportExportOptions.FromDict(opts_s)
           return backend.StartImportExportDaemon(constants.IEM_EXPORT, opts,
                                                  host, port,
                                                  objects.Instance.FromDict(instance),
                                                  source,
                                                  _DecodeImportExportIO(source,
                                                                        source_args))
         @staticmethod
         def perspective_impexp_status(params):
           """Retrieves the status of an import or export daemon.
           """
           return backend.GetImportExportStatus(params[0])
         @staticmethod
         def perspective_impexp_abort(params):
           """Aborts an import or export.
           """
           return backend.AbortImportExport(params[0])
         @staticmethod
         def perspective_impexp_cleanup(params):
           """Cleans up after an import or export.
           """
           return backend.CleanupImportExport(params[0])
       def CheckNoded(_, args):
         """Initial checks whether to run or exit with a failure.
         """
         if args: # noded doesn't take any arguments
           print >> sys.stderr, ("Usage: %s [-f] [-d] [-p port] [-b ADDRESS]" %
                                 sys.argv[0])
           sys.exit(constants.EXIT_FAILURE)
       def ExecNoded(options, _):
         """Main node daemon function, executed with the PID file held.
         """
         if options.mlock:
           utils.Mlockall()
           request_executor_class = MlockallRequestExecutor
         else:
           request_executor_class = http.server.HttpServerRequestExecutor
         # Read SSL certificate
         if options.ssl:
           ssl_params = http.HttpSslParams(ssl_key_path=options.ssl_key,
                                           ssl_cert_path=options.ssl_cert)
         else:
           ssl_params = None
         err = _PrepareQueueLock()
         if err is not None:
           # this might be some kind of file-system/permission error; while
           # this breaks the job queue functionality, we shouldn't prevent
           # startup of the whole node daemon because of this
           logging.critical("Can't init/verify the queue, proceeding anyway: %s", err)
         mainloop = daemon.Mainloop()
         server = NodeHttpServer(mainloop, options.bind_address, options.port,
                                 ssl_params=ssl_params, ssl_verify_peer=True,
                                 request_executor_class=request_executor_class)
         server.Start()
         try:
           mainloop.Run()
         finally:
           server.Stop()
       def main():
         """Main function for the node daemon.
         """
         parser = OptionParser(description="Ganeti node daemon",
                               usage="%prog [-f] [-d] [-p port] [-b ADDRESS]",
                               version="%%prog (ganeti) %s" %
                               constants.RELEASE_VERSION)
         parser.add_option("--no-mlock", dest="mlock",
                           help="Do not mlock the node memory in ram",
                           default=True, action="store_false")
         dirs = [(val, constants.RUN_DIRS_MODE) for val in constants.SUB_RUN_DIRS]
         dirs.append((constants.LOG_OS_DIR, 0750))
         dirs.append((constants.LOCK_DIR, 1777))
         dirs.append((constants.CRYPTO_KEYS_DIR, constants.CRYPTO_KEYS_DIR_MODE))
         dirs.append((constants.IMPORT_EXPORT_DIR, constants.IMPORT_EXPORT_DIR_MODE))
         daemon.GenericMain(constants.NODED, parser, dirs, CheckNoded, ExecNoded,
                            default_ssl_cert=constants.NODED_CERT_FILE,
                            default_ssl_key=constants.NODED_CERT_FILE,
                            console_logging=True)
       if __name__ == '__main__':
         main()

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