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#
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# Copyright (C) 2010 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Instance-related functions and classes for masterd.
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"""
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import logging
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import time
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from ganeti import constants
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from ganeti import errors
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from ganeti import compat
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class _ImportExportError(Exception):
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"""Local exception to report import/export errors.
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"""
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class ImportExportTimeouts(object):
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#: Time until daemon starts writing status file
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DEFAULT_READY_TIMEOUT = 10
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#: Length of time until errors cause hard failure
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DEFAULT_ERROR_TIMEOUT = 10
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#: Time after which daemon must be listening
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DEFAULT_LISTEN_TIMEOUT = 10
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__slots__ = [
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"error",
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"ready",
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"listen",
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"connect",
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]
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def __init__(self, connect,
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listen=DEFAULT_LISTEN_TIMEOUT,
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error=DEFAULT_ERROR_TIMEOUT,
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ready=DEFAULT_READY_TIMEOUT):
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"""Initializes this class.
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@type connect: number
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@param connect: Timeout for establishing connection
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@type listen: number
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@param listen: Timeout for starting to listen for connections
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@type error: number
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@param error: Length of time until errors cause hard failure
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@type ready: number
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@param ready: Timeout for daemon to become ready
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"""
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self.error = error
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self.ready = ready
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self.listen = listen
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self.connect = connect
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class ImportExportCbBase(object):
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"""Callbacks for disk import/export.
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"""
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def ReportListening(self, ie, private):
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"""Called when daemon started listening.
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@type ie: Subclass of L{_DiskImportExportBase}
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@param ie: Import/export object
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@param private: Private data passed to import/export object
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"""
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def ReportConnected(self, ie, private):
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"""Called when a connection has been established.
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@type ie: Subclass of L{_DiskImportExportBase}
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@param ie: Import/export object
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@param private: Private data passed to import/export object
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"""
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def ReportFinished(self, ie, private):
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"""Called when a transfer has finished.
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@type ie: Subclass of L{_DiskImportExportBase}
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@param ie: Import/export object
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@param private: Private data passed to import/export object
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"""
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def _TimeoutExpired(epoch, timeout, _time_fn=time.time):
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"""Checks whether a timeout has expired.
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"""
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return _time_fn() > (epoch + timeout)
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class _DiskImportExportBase(object):
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MODE_TEXT = None
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def __init__(self, lu, node_name, x509_key_name, remote_x509_ca,
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instance, timeouts, cbs, private=None):
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"""Initializes this class.
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@param lu: Logical unit instance
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@type node_name: string
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@param node_name: Node name for import
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@type x509_key_name: string
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@param x509_key_name: Name of X509 key (None for node daemon key)
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@type remote_x509_ca: string
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@param remote_x509_ca: Remote peer's CA (None for node daemon certificate)
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@type instance: L{objects.Instance}
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@param instance: Instance object
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@type timeouts: L{ImportExportTimeouts}
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@param timeouts: Timeouts for this import
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@type cbs: L{ImportExportCbBase}
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@param cbs: Callbacks
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@param private: Private data for callback functions
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"""
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assert self.MODE_TEXT
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self._lu = lu
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self.node_name = node_name
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self._x509_key_name = x509_key_name
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self._remote_x509_ca = remote_x509_ca
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self._instance = instance
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self._timeouts = timeouts
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self._cbs = cbs
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self._private = private
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# Parent loop
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self._loop = None
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# Timestamps
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self._ts_begin = None
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self._ts_connected = None
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self._ts_finished = None
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self._ts_cleanup = None
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self._ts_last_error = None
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# Transfer status
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self.success = None
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self.final_message = None
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# Daemon status
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self._daemon_name = None
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self._daemon = None
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@property
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def recent_output(self):
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"""Returns the most recent output from the daemon.
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"""
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if self._daemon:
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return self._daemon.recent_output
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return None
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@property
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def active(self):
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"""Determines whether this transport is still active.
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"""
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return self.success is None
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@property
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def loop(self):
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"""Returns parent loop.
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@rtype: L{ImportExportLoop}
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"""
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return self._loop
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def SetLoop(self, loop):
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"""Sets the parent loop.
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@type loop: L{ImportExportLoop}
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"""
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if self._loop:
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raise errors.ProgrammerError("Loop can only be set once")
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self._loop = loop
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def _StartDaemon(self):
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"""Starts the import/export daemon.
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"""
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raise NotImplementedError()
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def CheckDaemon(self):
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"""Checks whether daemon has been started and if not, starts it.
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@rtype: string
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@return: Daemon name
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"""
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assert self._ts_cleanup is None
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if self._daemon_name is None:
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assert self._ts_begin is None
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result = self._StartDaemon()
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if result.fail_msg:
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raise _ImportExportError("Failed to start %s on %s: %s" %
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(self.MODE_TEXT, self.node_name,
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result.fail_msg))
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daemon_name = result.payload
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logging.info("Started %s %r on %s", self.MODE_TEXT, daemon_name,
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self.node_name)
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self._ts_begin = time.time()
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self._daemon_name = daemon_name
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return self._daemon_name
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def GetDaemonName(self):
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"""Returns the daemon name.
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"""
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assert self._daemon_name, "Daemon has not been started"
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assert self._ts_cleanup is None
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return self._daemon_name
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def Abort(self):
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"""Sends SIGTERM to import/export daemon (if still active).
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"""
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if self._daemon_name:
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self._lu.LogWarning("Aborting %s %r on %s",
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self.MODE_TEXT, self._daemon_name, self.node_name)
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result = self._lu.rpc.call_impexp_abort(self.node_name, self._daemon_name)
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if result.fail_msg:
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self._lu.LogWarning("Failed to abort %s %r on %s: %s",
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self.MODE_TEXT, self._daemon_name,
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self.node_name, result.fail_msg)
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return False
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return True
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def _SetDaemonData(self, data):
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"""Internal function for updating status daemon data.
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@type data: L{objects.ImportExportStatus}
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@param data: Daemon status data
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"""
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assert self._ts_begin is not None
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if not data:
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if _TimeoutExpired(self._ts_begin, self._timeouts.ready):
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raise _ImportExportError("Didn't become ready after %s seconds" %
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self._timeouts.ready)
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return False
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self._daemon = data
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return True
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def SetDaemonData(self, success, data):
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"""Updates daemon status data.
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@type success: bool
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@param success: Whether fetching data was successful or not
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@type data: L{objects.ImportExportStatus}
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@param data: Daemon status data
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"""
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if not success:
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if self._ts_last_error is None:
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self._ts_last_error = time.time()
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elif _TimeoutExpired(self._ts_last_error, self._timeouts.error):
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raise _ImportExportError("Too many errors while updating data")
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return False
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self._ts_last_error = None
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return self._SetDaemonData(data)
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def CheckListening(self):
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"""Checks whether the daemon is listening.
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"""
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raise NotImplementedError()
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def _GetConnectedCheckEpoch(self):
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"""Returns timeout to calculate connect timeout.
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"""
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raise NotImplementedError()
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def CheckConnected(self):
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"""Checks whether the daemon is connected.
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@rtype: bool
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@return: Whether the daemon is connected
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"""
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assert self._daemon, "Daemon status missing"
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if self._ts_connected is not None:
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return True
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if self._daemon.connected:
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self._ts_connected = time.time()
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# TODO: Log remote peer
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logging.debug("%s %r on %s is now connected",
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self.MODE_TEXT, self._daemon_name, self.node_name)
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self._cbs.ReportConnected(self, self._private)
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return True
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if _TimeoutExpired(self._GetConnectedCheckEpoch(), self._timeouts.connect):
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raise _ImportExportError("Not connected after %s seconds" %
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self._timeouts.connect)
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return False
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def CheckFinished(self):
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"""Checks whether the daemon exited.
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@rtype: bool
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@return: Whether the transfer is finished
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"""
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assert self._daemon, "Daemon status missing"
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if self._ts_finished:
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return True
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if self._daemon.exit_status is None:
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return False
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self._ts_finished = time.time()
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self._ReportFinished(self._daemon.exit_status == 0,
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self._daemon.error_message)
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return True
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def _ReportFinished(self, success, message):
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"""Transfer is finished or daemon exited.
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@type success: bool
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@param success: Whether the transfer was successful
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@type message: string
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@param message: Error message
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"""
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assert self.success is None
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self.success = success
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self.final_message = message
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if success:
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logging.info("%s %r on %s succeeded", self.MODE_TEXT, self._daemon_name,
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self.node_name)
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elif self._daemon_name:
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self._lu.LogWarning("%s %r on %s failed: %s",
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self.MODE_TEXT, self._daemon_name, self.node_name,
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message)
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else:
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self._lu.LogWarning("%s on %s failed: %s", self.MODE_TEXT,
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self.node_name, message)
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self._cbs.ReportFinished(self, self._private)
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def _Finalize(self):
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"""Makes the RPC call to finalize this import/export.
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"""
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return self._lu.rpc.call_impexp_cleanup(self.node_name, self._daemon_name)
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def Finalize(self, error=None):
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"""Finalizes this import/export.
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"""
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assert error or self.success is not None
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if self._daemon_name:
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logging.info("Finalizing %s %r on %s",
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self.MODE_TEXT, self._daemon_name, self.node_name)
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result = self._Finalize()
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if result.fail_msg:
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self._lu.LogWarning("Failed to finalize %s %r on %s: %s",
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self.MODE_TEXT, self._daemon_name,
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self.node_name, result.fail_msg)
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return False
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# Daemon is no longer running
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self._daemon_name = None
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self._ts_cleanup = time.time()
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if error:
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self._ReportFinished(False, error)
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return True
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class DiskImport(_DiskImportExportBase):
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MODE_TEXT = "import"
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def __init__(self, lu, node_name, x509_key_name, source_x509_ca, instance,
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dest, dest_args, timeouts, cbs, private=None):
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"""Initializes this class.
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@param lu: Logical unit instance
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@type node_name: string
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@param node_name: Node name for import
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@type x509_key_name: string
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@param x509_key_name: Name of X509 key (None for node daemon key)
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@type source_x509_ca: string
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@param source_x509_ca: Remote peer's CA (None for node daemon certificate)
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@type instance: L{objects.Instance}
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@param instance: Instance object
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@param dest: I/O destination
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@param dest_args: I/O arguments
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@type timeouts: L{ImportExportTimeouts}
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@param timeouts: Timeouts for this import
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@type cbs: L{ImportExportCbBase}
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@param cbs: Callbacks
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@param private: Private data for callback functions
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"""
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_DiskImportExportBase.__init__(self, lu, node_name,
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x509_key_name, source_x509_ca,
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instance, timeouts, cbs, private)
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self._dest = dest
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self._dest_args = dest_args
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# Timestamps
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self._ts_listening = None
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@property
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|
465 |
def listen_port(self):
|
|
466 |
"""Returns the port the daemon is listening on.
|
|
467 |
|
|
468 |
"""
|
|
469 |
if self._daemon:
|
|
470 |
return self._daemon.listen_port
|
|
471 |
|
|
472 |
return None
|
|
473 |
|
|
474 |
def _StartDaemon(self):
|
|
475 |
"""Starts the import daemon.
|
|
476 |
|
|
477 |
"""
|
|
478 |
return self._lu.rpc.call_import_start(self.node_name,
|
|
479 |
self._x509_key_name,
|
|
480 |
self._remote_x509_ca, self._instance,
|
|
481 |
self._dest, self._dest_args)
|
|
482 |
|
|
483 |
def CheckListening(self):
|
|
484 |
"""Checks whether the daemon is listening.
|
|
485 |
|
|
486 |
@rtype: bool
|
|
487 |
@return: Whether the daemon is listening
|
|
488 |
|
|
489 |
"""
|
|
490 |
assert self._daemon, "Daemon status missing"
|
|
491 |
|
|
492 |
if self._ts_listening is not None:
|
|
493 |
return True
|
|
494 |
|
|
495 |
port = self._daemon.listen_port
|
|
496 |
if port is not None:
|
|
497 |
self._ts_listening = time.time()
|
|
498 |
|
|
499 |
logging.debug("Import %r on %s is now listening on port %s",
|
|
500 |
self._daemon_name, self.node_name, port)
|
|
501 |
|
|
502 |
self._cbs.ReportListening(self, self._private)
|
|
503 |
|
|
504 |
return True
|
|
505 |
|
|
506 |
if _TimeoutExpired(self._ts_begin, self._timeouts.listen):
|
|
507 |
raise _ImportExportError("Not listening after %s seconds" %
|
|
508 |
self._timeouts.listen)
|
|
509 |
|
|
510 |
return False
|
|
511 |
|
|
512 |
def _GetConnectedCheckEpoch(self):
|
|
513 |
"""Returns the time since we started listening.
|
|
514 |
|
|
515 |
"""
|
|
516 |
assert self._ts_listening is not None, \
|
|
517 |
("Checking whether an import is connected is only useful"
|
|
518 |
" once it's been listening")
|
|
519 |
|
|
520 |
return self._ts_listening
|
|
521 |
|
|
522 |
|
|
523 |
class DiskExport(_DiskImportExportBase):
|
|
524 |
MODE_TEXT = "export"
|
|
525 |
|
|
526 |
def __init__(self, lu, node_name, x509_key_name, dest_x509_ca,
|
|
527 |
dest_host, dest_port, instance, source, source_args,
|
|
528 |
timeouts, cbs, private=None):
|
|
529 |
"""Initializes this class.
|
|
530 |
|
|
531 |
@param lu: Logical unit instance
|
|
532 |
@type node_name: string
|
|
533 |
@param node_name: Node name for import
|
|
534 |
@type x509_key_name: string
|
|
535 |
@param x509_key_name: Name of X509 key (None for node daemon key)
|
|
536 |
@type dest_x509_ca: string
|
|
537 |
@param dest_x509_ca: Remote peer's CA (None for node daemon certificate)
|
|
538 |
@type dest_host: string
|
|
539 |
@param dest_host: Destination host name or IP address
|
|
540 |
@type dest_port: number
|
|
541 |
@param dest_port: Destination port number
|
|
542 |
@type instance: L{objects.Instance}
|
|
543 |
@param instance: Instance object
|
|
544 |
@param source: I/O source
|
|
545 |
@param source_args: I/O source
|
|
546 |
@type timeouts: L{ImportExportTimeouts}
|
|
547 |
@param timeouts: Timeouts for this import
|
|
548 |
@type cbs: L{ImportExportCbBase}
|
|
549 |
@param cbs: Callbacks
|
|
550 |
@param private: Private data for callback functions
|
|
551 |
|
|
552 |
"""
|
|
553 |
_DiskImportExportBase.__init__(self, lu, node_name,
|
|
554 |
x509_key_name, dest_x509_ca,
|
|
555 |
instance, timeouts, cbs, private)
|
|
556 |
self._dest_host = dest_host
|
|
557 |
self._dest_port = dest_port
|
|
558 |
self._source = source
|
|
559 |
self._source_args = source_args
|
|
560 |
|
|
561 |
def _StartDaemon(self):
|
|
562 |
"""Starts the export daemon.
|
|
563 |
|
|
564 |
"""
|
|
565 |
return self._lu.rpc.call_export_start(self.node_name, self._x509_key_name,
|
|
566 |
self._remote_x509_ca,
|
|
567 |
self._dest_host, self._dest_port,
|
|
568 |
self._instance, self._source,
|
|
569 |
self._source_args)
|
|
570 |
|
|
571 |
def CheckListening(self):
|
|
572 |
"""Checks whether the daemon is listening.
|
|
573 |
|
|
574 |
"""
|
|
575 |
# Only an import can be listening
|
|
576 |
return True
|
|
577 |
|
|
578 |
def _GetConnectedCheckEpoch(self):
|
|
579 |
"""Returns the time since the daemon started.
|
|
580 |
|
|
581 |
"""
|
|
582 |
assert self._ts_begin is not None
|
|
583 |
|
|
584 |
return self._ts_begin
|
|
585 |
|
|
586 |
|
|
587 |
class ImportExportLoop:
|
|
588 |
MIN_DELAY = 1.0
|
|
589 |
MAX_DELAY = 20.0
|
|
590 |
|
|
591 |
def __init__(self, lu):
|
|
592 |
"""Initializes this class.
|
|
593 |
|
|
594 |
"""
|
|
595 |
self._lu = lu
|
|
596 |
self._queue = []
|
|
597 |
self._pending_add = []
|
|
598 |
|
|
599 |
def Add(self, diskie):
|
|
600 |
"""Adds an import/export object to the loop.
|
|
601 |
|
|
602 |
@type diskie: Subclass of L{_DiskImportExportBase}
|
|
603 |
@param diskie: Import/export object
|
|
604 |
|
|
605 |
"""
|
|
606 |
assert diskie not in self._pending_add
|
|
607 |
assert diskie.loop is None
|
|
608 |
|
|
609 |
diskie.SetLoop(self)
|
|
610 |
|
|
611 |
# Adding new objects to a staging list is necessary, otherwise the main
|
|
612 |
# loop gets confused if callbacks modify the queue while the main loop is
|
|
613 |
# iterating over it.
|
|
614 |
self._pending_add.append(diskie)
|
|
615 |
|
|
616 |
@staticmethod
|
|
617 |
def _CollectDaemonStatus(lu, daemons):
|
|
618 |
"""Collects the status for all import/export daemons.
|
|
619 |
|
|
620 |
"""
|
|
621 |
daemon_status = {}
|
|
622 |
|
|
623 |
for node_name, names in daemons.iteritems():
|
|
624 |
result = lu.rpc.call_impexp_status(node_name, names)
|
|
625 |
if result.fail_msg:
|
|
626 |
lu.LogWarning("Failed to get daemon status on %s: %s",
|
|
627 |
node_name, result.fail_msg)
|
|
628 |
continue
|
|
629 |
|
|
630 |
assert len(names) == len(result.payload)
|
|
631 |
|
|
632 |
daemon_status[node_name] = dict(zip(names, result.payload))
|
|
633 |
|
|
634 |
return daemon_status
|
|
635 |
|
|
636 |
@staticmethod
|
|
637 |
def _GetActiveDaemonNames(queue):
|
|
638 |
"""Gets the names of all active daemons.
|
|
639 |
|
|
640 |
"""
|
|
641 |
result = {}
|
|
642 |
for diskie in queue:
|
|
643 |
if not diskie.active:
|
|
644 |
continue
|
|
645 |
|
|
646 |
try:
|
|
647 |
# Start daemon if necessary
|
|
648 |
daemon_name = diskie.CheckDaemon()
|
|
649 |
except _ImportExportError, err:
|
|
650 |
logging.exception("%s failed", diskie.MODE_TEXT)
|
|
651 |
diskie.Finalize(error=str(err))
|
|
652 |
continue
|
|
653 |
|
|
654 |
result.setdefault(diskie.node_name, []).append(daemon_name)
|
|
655 |
|
|
656 |
assert len(queue) >= len(result)
|
|
657 |
assert len(queue) >= sum([len(names) for names in result.itervalues()])
|
|
658 |
|
|
659 |
logging.debug("daemons=%r", result)
|
|
660 |
|
|
661 |
return result
|
|
662 |
|
|
663 |
def _AddPendingToQueue(self):
|
|
664 |
"""Adds all pending import/export objects to the internal queue.
|
|
665 |
|
|
666 |
"""
|
|
667 |
assert compat.all(diskie not in self._queue and diskie.loop == self
|
|
668 |
for diskie in self._pending_add)
|
|
669 |
|
|
670 |
self._queue.extend(self._pending_add)
|
|
671 |
|
|
672 |
del self._pending_add[:]
|
|
673 |
|
|
674 |
def Run(self):
|
|
675 |
"""Utility main loop.
|
|
676 |
|
|
677 |
"""
|
|
678 |
while True:
|
|
679 |
self._AddPendingToQueue()
|
|
680 |
|
|
681 |
# Collect all active daemon names
|
|
682 |
daemons = self._GetActiveDaemonNames(self._queue)
|
|
683 |
if not daemons:
|
|
684 |
break
|
|
685 |
|
|
686 |
# Collection daemon status data
|
|
687 |
data = self._CollectDaemonStatus(self._lu, daemons)
|
|
688 |
|
|
689 |
# Use data
|
|
690 |
delay = self.MAX_DELAY
|
|
691 |
for diskie in self._queue:
|
|
692 |
if not diskie.active:
|
|
693 |
continue
|
|
694 |
|
|
695 |
try:
|
|
696 |
try:
|
|
697 |
all_daemon_data = data[diskie.node_name]
|
|
698 |
except KeyError:
|
|
699 |
result = diskie.SetDaemonData(False, None)
|
|
700 |
else:
|
|
701 |
result = \
|
|
702 |
diskie.SetDaemonData(True,
|
|
703 |
all_daemon_data[diskie.GetDaemonName()])
|
|
704 |
|
|
705 |
if not result:
|
|
706 |
# Daemon not yet ready, retry soon
|
|
707 |
delay = min(3.0, delay)
|
|
708 |
continue
|
|
709 |
|
|
710 |
if diskie.CheckFinished():
|
|
711 |
# Transfer finished
|
|
712 |
diskie.Finalize()
|
|
713 |
continue
|
|
714 |
|
|
715 |
# Normal case: check again in 5 seconds
|
|
716 |
delay = min(5.0, delay)
|
|
717 |
|
|
718 |
if not diskie.CheckListening():
|
|
719 |
# Not yet listening, retry soon
|
|
720 |
delay = min(1.0, delay)
|
|
721 |
continue
|
|
722 |
|
|
723 |
if not diskie.CheckConnected():
|
|
724 |
# Not yet connected, retry soon
|
|
725 |
delay = min(1.0, delay)
|
|
726 |
continue
|
|
727 |
|
|
728 |
except _ImportExportError, err:
|
|
729 |
logging.exception("%s failed", diskie.MODE_TEXT)
|
|
730 |
diskie.Finalize(error=str(err))
|
|
731 |
|
|
732 |
if not compat.any([diskie.active for diskie in self._queue]):
|
|
733 |
break
|
|
734 |
|
|
735 |
# Wait a bit
|
|
736 |
delay = min(self.MAX_DELAY, max(self.MIN_DELAY, delay))
|
|
737 |
logging.debug("Waiting for %ss", delay)
|
|
738 |
time.sleep(delay)
|
|
739 |
|
|
740 |
def FinalizeAll(self):
|
|
741 |
"""Finalizes all pending transfers.
|
|
742 |
|
|
743 |
"""
|
|
744 |
success = True
|
|
745 |
|
|
746 |
for diskie in self._queue:
|
|
747 |
success = diskie.Finalize() and success
|
|
748 |
|
|
749 |
return success
|