root / lib / cli.py @ 3f75b4f3
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# Copyright (C) 2006, 2007 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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"""Module dealing with command line parsing"""
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import sys |
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import textwrap |
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import os.path |
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import copy |
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import time |
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import logging |
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from cStringIO import StringIO |
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from ganeti import utils |
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from ganeti import errors |
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from ganeti import constants |
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from ganeti import opcodes |
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from ganeti import luxi |
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from ganeti import ssconf |
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from ganeti import rpc |
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from optparse import (OptionParser, TitledHelpFormatter, |
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Option, OptionValueError) |
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__all__ = [ |
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# Command line options
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"CONFIRM_OPT",
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"DEBUG_OPT",
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"DEBUG_SIMERR_OPT",
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"FIELDS_OPT",
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"FORCE_OPT",
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"NOHDR_OPT",
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"NWSYNC_OPT",
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"SEP_OPT",
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"SUBMIT_OPT",
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"SYNC_OPT",
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"TAG_SRC_OPT",
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"USEUNITS_OPT",
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"VERBOSE_OPT",
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# Generic functions for CLI programs
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"GenericMain",
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"GetClient",
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"GetOnlineNodes",
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"JobExecutor",
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"JobSubmittedException",
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"ParseTimespec",
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"SubmitOpCode",
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"SubmitOrSend",
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"UsesRPC",
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# Formatting functions
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"ToStderr", "ToStdout", |
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"FormatError",
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"GenerateTable",
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"AskUser",
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"FormatTimestamp",
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# Tags functions
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"ListTags",
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"AddTags",
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"RemoveTags",
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# command line options support infrastructure
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"ARGS_MANY_INSTANCES",
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"ARGS_MANY_NODES",
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"ARGS_NONE",
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"ARGS_ONE_INSTANCE",
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"ARGS_ONE_NODE",
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"ArgChoice",
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"ArgCommand",
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"ArgFile",
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"ArgHost",
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"ArgInstance",
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"ArgJobId",
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"ArgNode",
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"ArgSuggest",
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"ArgUnknown",
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"OPT_COMPL_INST_ADD_NODES",
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"OPT_COMPL_MANY_NODES",
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"OPT_COMPL_ONE_IALLOCATOR",
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"OPT_COMPL_ONE_INSTANCE",
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"OPT_COMPL_ONE_NODE",
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"OPT_COMPL_ONE_OS",
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"cli_option",
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"SplitNodeOption",
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] |
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NO_PREFIX = "no_"
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UN_PREFIX = "-"
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class _Argument: |
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def __init__(self, min=0, max=None): |
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self.min = min |
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self.max = max |
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def __repr__(self): |
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return ("<%s min=%s max=%s>" % |
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(self.__class__.__name__, self.min, self.max)) |
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class ArgSuggest(_Argument): |
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"""Suggesting argument.
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Value can be any of the ones passed to the constructor.
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"""
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def __init__(self, min=0, max=None, choices=None): |
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_Argument.__init__(self, min=min, max=max) |
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self.choices = choices
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def __repr__(self): |
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return ("<%s min=%s max=%s choices=%r>" % |
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(self.__class__.__name__, self.min, self.max, self.choices)) |
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class ArgChoice(ArgSuggest): |
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"""Choice argument.
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Value can be any of the ones passed to the constructor. Like L{ArgSuggest},
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but value must be one of the choices.
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"""
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class ArgUnknown(_Argument): |
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"""Unknown argument to program (e.g. determined at runtime).
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"""
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class ArgInstance(_Argument): |
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"""Instances argument.
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"""
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class ArgNode(_Argument): |
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"""Node argument.
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"""
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class ArgJobId(_Argument): |
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"""Job ID argument.
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"""
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class ArgFile(_Argument): |
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"""File path argument.
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"""
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class ArgCommand(_Argument): |
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"""Command argument.
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"""
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class ArgHost(_Argument): |
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"""Host argument.
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"""
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ARGS_NONE = [] |
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ARGS_MANY_INSTANCES = [ArgInstance()] |
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ARGS_MANY_NODES = [ArgNode()] |
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ARGS_ONE_INSTANCE = [ArgInstance(min=1, max=1)] |
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ARGS_ONE_NODE = [ArgNode(min=1, max=1)] |
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def _ExtractTagsObject(opts, args): |
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"""Extract the tag type object.
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Note that this function will modify its args parameter.
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"""
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if not hasattr(opts, "tag_type"): |
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raise errors.ProgrammerError("tag_type not passed to _ExtractTagsObject") |
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kind = opts.tag_type |
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if kind == constants.TAG_CLUSTER:
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retval = kind, kind |
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elif kind == constants.TAG_NODE or kind == constants.TAG_INSTANCE: |
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if not args: |
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raise errors.OpPrereqError("no arguments passed to the command") |
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name = args.pop(0)
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retval = kind, name |
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else:
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raise errors.ProgrammerError("Unhandled tag type '%s'" % kind) |
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return retval
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def _ExtendTags(opts, args): |
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"""Extend the args if a source file has been given.
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This function will extend the tags with the contents of the file
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passed in the 'tags_source' attribute of the opts parameter. A file
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named '-' will be replaced by stdin.
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"""
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fname = opts.tags_source |
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if fname is None: |
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return
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if fname == "-": |
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new_fh = sys.stdin |
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else:
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new_fh = open(fname, "r") |
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new_data = [] |
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try:
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# we don't use the nice 'new_data = [line.strip() for line in fh]'
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# because of python bug 1633941
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while True: |
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line = new_fh.readline() |
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if not line: |
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break
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new_data.append(line.strip()) |
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finally:
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new_fh.close() |
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args.extend(new_data) |
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def ListTags(opts, args): |
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"""List the tags on a given object.
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This is a generic implementation that knows how to deal with all
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three cases of tag objects (cluster, node, instance). The opts
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argument is expected to contain a tag_type field denoting what
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object type we work on.
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"""
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kind, name = _ExtractTagsObject(opts, args) |
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op = opcodes.OpGetTags(kind=kind, name=name) |
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result = SubmitOpCode(op) |
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result = list(result)
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result.sort() |
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for tag in result: |
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ToStdout(tag) |
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def AddTags(opts, args): |
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"""Add tags on a given object.
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This is a generic implementation that knows how to deal with all
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three cases of tag objects (cluster, node, instance). The opts
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argument is expected to contain a tag_type field denoting what
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object type we work on.
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"""
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kind, name = _ExtractTagsObject(opts, args) |
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_ExtendTags(opts, args) |
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if not args: |
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raise errors.OpPrereqError("No tags to be added") |
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op = opcodes.OpAddTags(kind=kind, name=name, tags=args) |
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SubmitOpCode(op) |
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def RemoveTags(opts, args): |
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"""Remove tags from a given object.
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This is a generic implementation that knows how to deal with all
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three cases of tag objects (cluster, node, instance). The opts
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argument is expected to contain a tag_type field denoting what
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object type we work on.
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"""
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kind, name = _ExtractTagsObject(opts, args) |
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_ExtendTags(opts, args) |
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if not args: |
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raise errors.OpPrereqError("No tags to be removed") |
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op = opcodes.OpDelTags(kind=kind, name=name, tags=args) |
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SubmitOpCode(op) |
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def check_unit(option, opt, value): |
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"""OptParsers custom converter for units.
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"""
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try:
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return utils.ParseUnit(value)
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except errors.UnitParseError, err:
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raise OptionValueError("option %s: %s" % (opt, err)) |
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def _SplitKeyVal(opt, data): |
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"""Convert a KeyVal string into a dict.
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This function will convert a key=val[,...] string into a dict. Empty
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values will be converted specially: keys which have the prefix 'no_'
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will have the value=False and the prefix stripped, the others will
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have value=True.
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@type opt: string
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@param opt: a string holding the option name for which we process the
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data, used in building error messages
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@type data: string
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@param data: a string of the format key=val,key=val,...
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@rtype: dict
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@return: {key=val, key=val}
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@raises errors.ParameterError: if there are duplicate keys
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"""
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kv_dict = {} |
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if data:
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for elem in data.split(","): |
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if "=" in elem: |
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key, val = elem.split("=", 1) |
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else:
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if elem.startswith(NO_PREFIX):
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key, val = elem[len(NO_PREFIX):], False |
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elif elem.startswith(UN_PREFIX):
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key, val = elem[len(UN_PREFIX):], None |
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else:
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key, val = elem, True
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if key in kv_dict: |
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raise errors.ParameterError("Duplicate key '%s' in option %s" % |
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(key, opt)) |
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kv_dict[key] = val |
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return kv_dict
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def check_ident_key_val(option, opt, value): |
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"""Custom parser for ident:key=val,key=val options.
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This will store the parsed values as a tuple (ident, {key: val}). As such,
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multiple uses of this option via action=append is possible.
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"""
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if ":" not in value: |
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ident, rest = value, ''
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else:
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ident, rest = value.split(":", 1) |
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if ident.startswith(NO_PREFIX):
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if rest:
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msg = "Cannot pass options when removing parameter groups: %s" % value
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raise errors.ParameterError(msg)
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retval = (ident[len(NO_PREFIX):], False) |
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elif ident.startswith(UN_PREFIX):
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if rest:
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msg = "Cannot pass options when removing parameter groups: %s" % value
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raise errors.ParameterError(msg)
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retval = (ident[len(UN_PREFIX):], None) |
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else:
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kv_dict = _SplitKeyVal(opt, rest) |
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retval = (ident, kv_dict) |
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return retval
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def check_key_val(option, opt, value): |
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"""Custom parser class for key=val,key=val options.
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This will store the parsed values as a dict {key: val}.
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"""
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return _SplitKeyVal(opt, value)
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# completion_suggestion is normally a list. Using numeric values not evaluating
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# to False for dynamic completion.
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(OPT_COMPL_MANY_NODES, |
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OPT_COMPL_ONE_NODE, |
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OPT_COMPL_ONE_INSTANCE, |
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OPT_COMPL_ONE_OS, |
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OPT_COMPL_ONE_IALLOCATOR, |
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OPT_COMPL_INST_ADD_NODES) = range(100, 106) |
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OPT_COMPL_ALL = frozenset([
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OPT_COMPL_MANY_NODES, |
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OPT_COMPL_ONE_NODE, |
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OPT_COMPL_ONE_INSTANCE, |
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OPT_COMPL_ONE_OS, |
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OPT_COMPL_ONE_IALLOCATOR, |
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OPT_COMPL_INST_ADD_NODES, |
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]) |
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class CliOption(Option): |
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"""Custom option class for optparse.
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"""
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ATTRS = Option.ATTRS + [ |
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"completion_suggest",
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] |
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TYPES = Option.TYPES + ( |
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"identkeyval",
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"keyval",
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"unit",
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) |
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TYPE_CHECKER = Option.TYPE_CHECKER.copy() |
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TYPE_CHECKER["identkeyval"] = check_ident_key_val
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TYPE_CHECKER["keyval"] = check_key_val
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TYPE_CHECKER["unit"] = check_unit
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# optparse.py sets make_option, so we do it for our own option class, too
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cli_option = CliOption |
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DEBUG_OPT = cli_option("-d", "--debug", default=False, |
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action="store_true",
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help="Turn debugging on")
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NOHDR_OPT = cli_option("--no-headers", default=False, |
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action="store_true", dest="no_headers", |
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help="Don't display column headers")
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SEP_OPT = cli_option("--separator", default=None, |
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action="store", dest="separator", |
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help=("Separator between output fields"
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" (defaults to one space)"))
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USEUNITS_OPT = cli_option("--units", default=None, |
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dest="units", choices=('h', 'm', 'g', 't'), |
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help="Specify units for output (one of hmgt)")
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FIELDS_OPT = cli_option("-o", "--output", dest="output", action="store", |
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type="string", metavar="FIELDS", |
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help="Comma separated list of output fields")
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FORCE_OPT = cli_option("-f", "--force", dest="force", action="store_true", |
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default=False, help="Force the operation") |
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CONFIRM_OPT = cli_option("--yes", dest="confirm", action="store_true", |
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default=False, help="Do not require confirmation") |
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TAG_SRC_OPT = cli_option("--from", dest="tags_source", |
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default=None, help="File with tag names") |
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SUBMIT_OPT = cli_option("--submit", dest="submit_only", |
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default=False, action="store_true", |
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help=("Submit the job and return the job ID, but"
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" don't wait for the job to finish"))
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SYNC_OPT = cli_option("--sync", dest="do_locking", |
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default=False, action="store_true", |
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help=("Grab locks while doing the queries"
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" in order to ensure more consistent results"))
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_DRY_RUN_OPT = cli_option("--dry-run", default=False, |
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action="store_true",
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help=("Do not execute the operation, just run the"
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" check steps and verify it it could be"
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" executed"))
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VERBOSE_OPT = cli_option("-v", "--verbose", default=False, |
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action="store_true",
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help="Increase the verbosity of the operation")
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DEBUG_SIMERR_OPT = cli_option("--debug-simulate-errors", default=False, |
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action="store_true", dest="simulate_errors", |
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help="Debugging option that makes the operation"
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" treat most runtime checks as failed")
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NWSYNC_OPT = cli_option("--no-wait-for-sync", dest="wait_for_sync", |
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default=True, action="store_false", |
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help="Don't wait for sync (DANGEROUS!)")
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def _ParseArgs(argv, commands, aliases): |
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"""Parser for the command line arguments.
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This function parses the arguments and returns the function which
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must be executed together with its (modified) arguments.
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@param argv: the command line
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@param commands: dictionary with special contents, see the design
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doc for cmdline handling
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@param aliases: dictionary with command aliases {'alias': 'target, ...}
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"""
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if len(argv) == 0: |
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binary = "<command>"
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else:
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binary = argv[0].split("/")[-1] |
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if len(argv) > 1 and argv[1] == "--version": |
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ToStdout("%s (ganeti) %s", binary, constants.RELEASE_VERSION)
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# Quit right away. That way we don't have to care about this special
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# argument. optparse.py does it the same.
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sys.exit(0)
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if len(argv) < 2 or not (argv[1] in commands or |
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argv[1] in aliases): |
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# let's do a nice thing
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sortedcmds = commands.keys() |
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sortedcmds.sort() |
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ToStdout("Usage: %s {command} [options...] [argument...]", binary)
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ToStdout("%s <command> --help to see details, or man %s", binary, binary)
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ToStdout("")
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# compute the max line length for cmd + usage
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mlen = max([len(" %s" % cmd) for cmd in commands]) |
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mlen = min(60, mlen) # should not get here... |
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# and format a nice command list
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ToStdout("Commands:")
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for cmd in sortedcmds: |
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cmdstr = " %s" % (cmd,)
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help_text = commands[cmd][4]
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help_lines = textwrap.wrap(help_text, 79 - 3 - mlen) |
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ToStdout("%-*s - %s", mlen, cmdstr, help_lines.pop(0)) |
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for line in help_lines: |
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ToStdout("%-*s %s", mlen, "", line) |
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ToStdout("")
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return None, None, None |
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|
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# get command, unalias it, and look it up in commands
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cmd = argv.pop(1)
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if cmd in aliases: |
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if cmd in commands: |
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raise errors.ProgrammerError("Alias '%s' overrides an existing" |
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" command" % cmd)
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|
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if aliases[cmd] not in commands: |
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raise errors.ProgrammerError("Alias '%s' maps to non-existing" |
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" command '%s'" % (cmd, aliases[cmd]))
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cmd = aliases[cmd] |
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func, args_def, parser_opts, usage, description = commands[cmd] |
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parser = OptionParser(option_list=parser_opts + [_DRY_RUN_OPT], |
545 |
description=description, |
546 |
formatter=TitledHelpFormatter(), |
547 |
usage="%%prog %s %s" % (cmd, usage))
|
548 |
parser.disable_interspersed_args() |
549 |
options, args = parser.parse_args() |
550 |
|
551 |
if not _CheckArguments(cmd, args_def, args): |
552 |
return None, None, None |
553 |
|
554 |
return func, options, args
|
555 |
|
556 |
|
557 |
def _CheckArguments(cmd, args_def, args): |
558 |
"""Verifies the arguments using the argument definition.
|
559 |
|
560 |
Algorithm:
|
561 |
|
562 |
1. Abort with error if values specified by user but none expected.
|
563 |
|
564 |
1. For each argument in definition
|
565 |
|
566 |
1. Keep running count of minimum number of values (min_count)
|
567 |
1. Keep running count of maximum number of values (max_count)
|
568 |
1. If it has an unlimited number of values
|
569 |
|
570 |
1. Abort with error if it's not the last argument in the definition
|
571 |
|
572 |
1. If last argument has limited number of values
|
573 |
|
574 |
1. Abort with error if number of values doesn't match or is too large
|
575 |
|
576 |
1. Abort with error if user didn't pass enough values (min_count)
|
577 |
|
578 |
"""
|
579 |
if args and not args_def: |
580 |
ToStderr("Error: Command %s expects no arguments", cmd)
|
581 |
return False |
582 |
|
583 |
min_count = None
|
584 |
max_count = None
|
585 |
check_max = None
|
586 |
|
587 |
last_idx = len(args_def) - 1 |
588 |
|
589 |
for idx, arg in enumerate(args_def): |
590 |
if min_count is None: |
591 |
min_count = arg.min |
592 |
elif arg.min is not None: |
593 |
min_count += arg.min |
594 |
|
595 |
if max_count is None: |
596 |
max_count = arg.max |
597 |
elif arg.max is not None: |
598 |
max_count += arg.max |
599 |
|
600 |
if idx == last_idx:
|
601 |
check_max = (arg.max is not None) |
602 |
|
603 |
elif arg.max is None: |
604 |
raise errors.ProgrammerError("Only the last argument can have max=None") |
605 |
|
606 |
if check_max:
|
607 |
# Command with exact number of arguments
|
608 |
if (min_count is not None and max_count is not None and |
609 |
min_count == max_count and len(args) != min_count): |
610 |
ToStderr("Error: Command %s expects %d argument(s)", cmd, min_count)
|
611 |
return False |
612 |
|
613 |
# Command with limited number of arguments
|
614 |
if max_count is not None and len(args) > max_count: |
615 |
ToStderr("Error: Command %s expects only %d argument(s)",
|
616 |
cmd, max_count) |
617 |
return False |
618 |
|
619 |
# Command with some required arguments
|
620 |
if min_count is not None and len(args) < min_count: |
621 |
ToStderr("Error: Command %s expects at least %d argument(s)",
|
622 |
cmd, min_count) |
623 |
return False |
624 |
|
625 |
return True |
626 |
|
627 |
|
628 |
def SplitNodeOption(value): |
629 |
"""Splits the value of a --node option.
|
630 |
|
631 |
"""
|
632 |
if value and ':' in value: |
633 |
return value.split(':', 1) |
634 |
else:
|
635 |
return (value, None) |
636 |
|
637 |
|
638 |
def UsesRPC(fn): |
639 |
def wrapper(*args, **kwargs): |
640 |
rpc.Init() |
641 |
try:
|
642 |
return fn(*args, **kwargs)
|
643 |
finally:
|
644 |
rpc.Shutdown() |
645 |
return wrapper
|
646 |
|
647 |
|
648 |
def AskUser(text, choices=None): |
649 |
"""Ask the user a question.
|
650 |
|
651 |
@param text: the question to ask
|
652 |
|
653 |
@param choices: list with elements tuples (input_char, return_value,
|
654 |
description); if not given, it will default to: [('y', True,
|
655 |
'Perform the operation'), ('n', False, 'Do no do the operation')];
|
656 |
note that the '?' char is reserved for help
|
657 |
|
658 |
@return: one of the return values from the choices list; if input is
|
659 |
not possible (i.e. not running with a tty, we return the last
|
660 |
entry from the list
|
661 |
|
662 |
"""
|
663 |
if choices is None: |
664 |
choices = [('y', True, 'Perform the operation'), |
665 |
('n', False, 'Do not perform the operation')] |
666 |
if not choices or not isinstance(choices, list): |
667 |
raise errors.ProgrammerError("Invalid choices argument to AskUser") |
668 |
for entry in choices: |
669 |
if not isinstance(entry, tuple) or len(entry) < 3 or entry[0] == '?': |
670 |
raise errors.ProgrammerError("Invalid choices element to AskUser") |
671 |
|
672 |
answer = choices[-1][1] |
673 |
new_text = [] |
674 |
for line in text.splitlines(): |
675 |
new_text.append(textwrap.fill(line, 70, replace_whitespace=False)) |
676 |
text = "\n".join(new_text)
|
677 |
try:
|
678 |
f = file("/dev/tty", "a+") |
679 |
except IOError: |
680 |
return answer
|
681 |
try:
|
682 |
chars = [entry[0] for entry in choices] |
683 |
chars[-1] = "[%s]" % chars[-1] |
684 |
chars.append('?')
|
685 |
maps = dict([(entry[0], entry[1]) for entry in choices]) |
686 |
while True: |
687 |
f.write(text) |
688 |
f.write('\n')
|
689 |
f.write("/".join(chars))
|
690 |
f.write(": ")
|
691 |
line = f.readline(2).strip().lower()
|
692 |
if line in maps: |
693 |
answer = maps[line] |
694 |
break
|
695 |
elif line == '?': |
696 |
for entry in choices: |
697 |
f.write(" %s - %s\n" % (entry[0], entry[2])) |
698 |
f.write("\n")
|
699 |
continue
|
700 |
finally:
|
701 |
f.close() |
702 |
return answer
|
703 |
|
704 |
|
705 |
class JobSubmittedException(Exception): |
706 |
"""Job was submitted, client should exit.
|
707 |
|
708 |
This exception has one argument, the ID of the job that was
|
709 |
submitted. The handler should print this ID.
|
710 |
|
711 |
This is not an error, just a structured way to exit from clients.
|
712 |
|
713 |
"""
|
714 |
|
715 |
|
716 |
def SendJob(ops, cl=None): |
717 |
"""Function to submit an opcode without waiting for the results.
|
718 |
|
719 |
@type ops: list
|
720 |
@param ops: list of opcodes
|
721 |
@type cl: luxi.Client
|
722 |
@param cl: the luxi client to use for communicating with the master;
|
723 |
if None, a new client will be created
|
724 |
|
725 |
"""
|
726 |
if cl is None: |
727 |
cl = GetClient() |
728 |
|
729 |
job_id = cl.SubmitJob(ops) |
730 |
|
731 |
return job_id
|
732 |
|
733 |
|
734 |
def PollJob(job_id, cl=None, feedback_fn=None): |
735 |
"""Function to poll for the result of a job.
|
736 |
|
737 |
@type job_id: job identified
|
738 |
@param job_id: the job to poll for results
|
739 |
@type cl: luxi.Client
|
740 |
@param cl: the luxi client to use for communicating with the master;
|
741 |
if None, a new client will be created
|
742 |
|
743 |
"""
|
744 |
if cl is None: |
745 |
cl = GetClient() |
746 |
|
747 |
prev_job_info = None
|
748 |
prev_logmsg_serial = None
|
749 |
|
750 |
while True: |
751 |
result = cl.WaitForJobChange(job_id, ["status"], prev_job_info,
|
752 |
prev_logmsg_serial) |
753 |
if not result: |
754 |
# job not found, go away!
|
755 |
raise errors.JobLost("Job with id %s lost" % job_id) |
756 |
|
757 |
# Split result, a tuple of (field values, log entries)
|
758 |
(job_info, log_entries) = result |
759 |
(status, ) = job_info |
760 |
|
761 |
if log_entries:
|
762 |
for log_entry in log_entries: |
763 |
(serial, timestamp, _, message) = log_entry |
764 |
if callable(feedback_fn): |
765 |
feedback_fn(log_entry[1:])
|
766 |
else:
|
767 |
encoded = utils.SafeEncode(message) |
768 |
ToStdout("%s %s", time.ctime(utils.MergeTime(timestamp)), encoded)
|
769 |
prev_logmsg_serial = max(prev_logmsg_serial, serial)
|
770 |
|
771 |
# TODO: Handle canceled and archived jobs
|
772 |
elif status in (constants.JOB_STATUS_SUCCESS, |
773 |
constants.JOB_STATUS_ERROR, |
774 |
constants.JOB_STATUS_CANCELING, |
775 |
constants.JOB_STATUS_CANCELED): |
776 |
break
|
777 |
|
778 |
prev_job_info = job_info |
779 |
|
780 |
jobs = cl.QueryJobs([job_id], ["status", "opstatus", "opresult"]) |
781 |
if not jobs: |
782 |
raise errors.JobLost("Job with id %s lost" % job_id) |
783 |
|
784 |
status, opstatus, result = jobs[0]
|
785 |
if status == constants.JOB_STATUS_SUCCESS:
|
786 |
return result
|
787 |
elif status in (constants.JOB_STATUS_CANCELING, |
788 |
constants.JOB_STATUS_CANCELED): |
789 |
raise errors.OpExecError("Job was canceled") |
790 |
else:
|
791 |
has_ok = False
|
792 |
for idx, (status, msg) in enumerate(zip(opstatus, result)): |
793 |
if status == constants.OP_STATUS_SUCCESS:
|
794 |
has_ok = True
|
795 |
elif status == constants.OP_STATUS_ERROR:
|
796 |
errors.MaybeRaise(msg) |
797 |
if has_ok:
|
798 |
raise errors.OpExecError("partial failure (opcode %d): %s" % |
799 |
(idx, msg)) |
800 |
else:
|
801 |
raise errors.OpExecError(str(msg)) |
802 |
# default failure mode
|
803 |
raise errors.OpExecError(result)
|
804 |
|
805 |
|
806 |
def SubmitOpCode(op, cl=None, feedback_fn=None): |
807 |
"""Legacy function to submit an opcode.
|
808 |
|
809 |
This is just a simple wrapper over the construction of the processor
|
810 |
instance. It should be extended to better handle feedback and
|
811 |
interaction functions.
|
812 |
|
813 |
"""
|
814 |
if cl is None: |
815 |
cl = GetClient() |
816 |
|
817 |
job_id = SendJob([op], cl) |
818 |
|
819 |
op_results = PollJob(job_id, cl=cl, feedback_fn=feedback_fn) |
820 |
|
821 |
return op_results[0] |
822 |
|
823 |
|
824 |
def SubmitOrSend(op, opts, cl=None, feedback_fn=None): |
825 |
"""Wrapper around SubmitOpCode or SendJob.
|
826 |
|
827 |
This function will decide, based on the 'opts' parameter, whether to
|
828 |
submit and wait for the result of the opcode (and return it), or
|
829 |
whether to just send the job and print its identifier. It is used in
|
830 |
order to simplify the implementation of the '--submit' option.
|
831 |
|
832 |
It will also add the dry-run parameter from the options passed, if true.
|
833 |
|
834 |
"""
|
835 |
if opts and opts.dry_run: |
836 |
op.dry_run = opts.dry_run |
837 |
if opts and opts.submit_only: |
838 |
job_id = SendJob([op], cl=cl) |
839 |
raise JobSubmittedException(job_id)
|
840 |
else:
|
841 |
return SubmitOpCode(op, cl=cl, feedback_fn=feedback_fn)
|
842 |
|
843 |
|
844 |
def GetClient(): |
845 |
# TODO: Cache object?
|
846 |
try:
|
847 |
client = luxi.Client() |
848 |
except luxi.NoMasterError:
|
849 |
master, myself = ssconf.GetMasterAndMyself() |
850 |
if master != myself:
|
851 |
raise errors.OpPrereqError("This is not the master node, please connect" |
852 |
" to node '%s' and rerun the command" %
|
853 |
master) |
854 |
else:
|
855 |
raise
|
856 |
return client
|
857 |
|
858 |
|
859 |
def FormatError(err): |
860 |
"""Return a formatted error message for a given error.
|
861 |
|
862 |
This function takes an exception instance and returns a tuple
|
863 |
consisting of two values: first, the recommended exit code, and
|
864 |
second, a string describing the error message (not
|
865 |
newline-terminated).
|
866 |
|
867 |
"""
|
868 |
retcode = 1
|
869 |
obuf = StringIO() |
870 |
msg = str(err)
|
871 |
if isinstance(err, errors.ConfigurationError): |
872 |
txt = "Corrupt configuration file: %s" % msg
|
873 |
logging.error(txt) |
874 |
obuf.write(txt + "\n")
|
875 |
obuf.write("Aborting.")
|
876 |
retcode = 2
|
877 |
elif isinstance(err, errors.HooksAbort): |
878 |
obuf.write("Failure: hooks execution failed:\n")
|
879 |
for node, script, out in err.args[0]: |
880 |
if out:
|
881 |
obuf.write(" node: %s, script: %s, output: %s\n" %
|
882 |
(node, script, out)) |
883 |
else:
|
884 |
obuf.write(" node: %s, script: %s (no output)\n" %
|
885 |
(node, script)) |
886 |
elif isinstance(err, errors.HooksFailure): |
887 |
obuf.write("Failure: hooks general failure: %s" % msg)
|
888 |
elif isinstance(err, errors.ResolverError): |
889 |
this_host = utils.HostInfo.SysName() |
890 |
if err.args[0] == this_host: |
891 |
msg = "Failure: can't resolve my own hostname ('%s')"
|
892 |
else:
|
893 |
msg = "Failure: can't resolve hostname '%s'"
|
894 |
obuf.write(msg % err.args[0])
|
895 |
elif isinstance(err, errors.OpPrereqError): |
896 |
obuf.write("Failure: prerequisites not met for this"
|
897 |
" operation:\n%s" % msg)
|
898 |
elif isinstance(err, errors.OpExecError): |
899 |
obuf.write("Failure: command execution error:\n%s" % msg)
|
900 |
elif isinstance(err, errors.TagError): |
901 |
obuf.write("Failure: invalid tag(s) given:\n%s" % msg)
|
902 |
elif isinstance(err, errors.JobQueueDrainError): |
903 |
obuf.write("Failure: the job queue is marked for drain and doesn't"
|
904 |
" accept new requests\n")
|
905 |
elif isinstance(err, errors.JobQueueFull): |
906 |
obuf.write("Failure: the job queue is full and doesn't accept new"
|
907 |
" job submissions until old jobs are archived\n")
|
908 |
elif isinstance(err, errors.TypeEnforcementError): |
909 |
obuf.write("Parameter Error: %s" % msg)
|
910 |
elif isinstance(err, errors.ParameterError): |
911 |
obuf.write("Failure: unknown/wrong parameter name '%s'" % msg)
|
912 |
elif isinstance(err, errors.GenericError): |
913 |
obuf.write("Unhandled Ganeti error: %s" % msg)
|
914 |
elif isinstance(err, luxi.NoMasterError): |
915 |
obuf.write("Cannot communicate with the master daemon.\nIs it running"
|
916 |
" and listening for connections?")
|
917 |
elif isinstance(err, luxi.TimeoutError): |
918 |
obuf.write("Timeout while talking to the master daemon. Error:\n"
|
919 |
"%s" % msg)
|
920 |
elif isinstance(err, luxi.ProtocolError): |
921 |
obuf.write("Unhandled protocol error while talking to the master daemon:\n"
|
922 |
"%s" % msg)
|
923 |
elif isinstance(err, JobSubmittedException): |
924 |
obuf.write("JobID: %s\n" % err.args[0]) |
925 |
retcode = 0
|
926 |
else:
|
927 |
obuf.write("Unhandled exception: %s" % msg)
|
928 |
return retcode, obuf.getvalue().rstrip('\n') |
929 |
|
930 |
|
931 |
def GenericMain(commands, override=None, aliases=None): |
932 |
"""Generic main function for all the gnt-* commands.
|
933 |
|
934 |
Arguments:
|
935 |
- commands: a dictionary with a special structure, see the design doc
|
936 |
for command line handling.
|
937 |
- override: if not None, we expect a dictionary with keys that will
|
938 |
override command line options; this can be used to pass
|
939 |
options from the scripts to generic functions
|
940 |
- aliases: dictionary with command aliases {'alias': 'target, ...}
|
941 |
|
942 |
"""
|
943 |
# save the program name and the entire command line for later logging
|
944 |
if sys.argv:
|
945 |
binary = os.path.basename(sys.argv[0]) or sys.argv[0] |
946 |
if len(sys.argv) >= 2: |
947 |
binary += " " + sys.argv[1] |
948 |
old_cmdline = " ".join(sys.argv[2:]) |
949 |
else:
|
950 |
old_cmdline = ""
|
951 |
else:
|
952 |
binary = "<unknown program>"
|
953 |
old_cmdline = ""
|
954 |
|
955 |
if aliases is None: |
956 |
aliases = {} |
957 |
|
958 |
try:
|
959 |
func, options, args = _ParseArgs(sys.argv, commands, aliases) |
960 |
except errors.ParameterError, err:
|
961 |
result, err_msg = FormatError(err) |
962 |
ToStderr(err_msg) |
963 |
return 1 |
964 |
|
965 |
if func is None: # parse error |
966 |
return 1 |
967 |
|
968 |
if override is not None: |
969 |
for key, val in override.iteritems(): |
970 |
setattr(options, key, val)
|
971 |
|
972 |
utils.SetupLogging(constants.LOG_COMMANDS, debug=options.debug, |
973 |
stderr_logging=True, program=binary)
|
974 |
|
975 |
if old_cmdline:
|
976 |
logging.info("run with arguments '%s'", old_cmdline)
|
977 |
else:
|
978 |
logging.info("run with no arguments")
|
979 |
|
980 |
try:
|
981 |
result = func(options, args) |
982 |
except (errors.GenericError, luxi.ProtocolError,
|
983 |
JobSubmittedException), err: |
984 |
result, err_msg = FormatError(err) |
985 |
logging.exception("Error during command processing")
|
986 |
ToStderr(err_msg) |
987 |
|
988 |
return result
|
989 |
|
990 |
|
991 |
def GenerateTable(headers, fields, separator, data, |
992 |
numfields=None, unitfields=None, |
993 |
units=None):
|
994 |
"""Prints a table with headers and different fields.
|
995 |
|
996 |
@type headers: dict
|
997 |
@param headers: dictionary mapping field names to headers for
|
998 |
the table
|
999 |
@type fields: list
|
1000 |
@param fields: the field names corresponding to each row in
|
1001 |
the data field
|
1002 |
@param separator: the separator to be used; if this is None,
|
1003 |
the default 'smart' algorithm is used which computes optimal
|
1004 |
field width, otherwise just the separator is used between
|
1005 |
each field
|
1006 |
@type data: list
|
1007 |
@param data: a list of lists, each sublist being one row to be output
|
1008 |
@type numfields: list
|
1009 |
@param numfields: a list with the fields that hold numeric
|
1010 |
values and thus should be right-aligned
|
1011 |
@type unitfields: list
|
1012 |
@param unitfields: a list with the fields that hold numeric
|
1013 |
values that should be formatted with the units field
|
1014 |
@type units: string or None
|
1015 |
@param units: the units we should use for formatting, or None for
|
1016 |
automatic choice (human-readable for non-separator usage, otherwise
|
1017 |
megabytes); this is a one-letter string
|
1018 |
|
1019 |
"""
|
1020 |
if units is None: |
1021 |
if separator:
|
1022 |
units = "m"
|
1023 |
else:
|
1024 |
units = "h"
|
1025 |
|
1026 |
if numfields is None: |
1027 |
numfields = [] |
1028 |
if unitfields is None: |
1029 |
unitfields = [] |
1030 |
|
1031 |
numfields = utils.FieldSet(*numfields) |
1032 |
unitfields = utils.FieldSet(*unitfields) |
1033 |
|
1034 |
format_fields = [] |
1035 |
for field in fields: |
1036 |
if headers and field not in headers: |
1037 |
# TODO: handle better unknown fields (either revert to old
|
1038 |
# style of raising exception, or deal more intelligently with
|
1039 |
# variable fields)
|
1040 |
headers[field] = field |
1041 |
if separator is not None: |
1042 |
format_fields.append("%s")
|
1043 |
elif numfields.Matches(field):
|
1044 |
format_fields.append("%*s")
|
1045 |
else:
|
1046 |
format_fields.append("%-*s")
|
1047 |
|
1048 |
if separator is None: |
1049 |
mlens = [0 for name in fields] |
1050 |
format = ' '.join(format_fields)
|
1051 |
else:
|
1052 |
format = separator.replace("%", "%%").join(format_fields) |
1053 |
|
1054 |
for row in data: |
1055 |
if row is None: |
1056 |
continue
|
1057 |
for idx, val in enumerate(row): |
1058 |
if unitfields.Matches(fields[idx]):
|
1059 |
try:
|
1060 |
val = int(val)
|
1061 |
except ValueError: |
1062 |
pass
|
1063 |
else:
|
1064 |
val = row[idx] = utils.FormatUnit(val, units) |
1065 |
val = row[idx] = str(val)
|
1066 |
if separator is None: |
1067 |
mlens[idx] = max(mlens[idx], len(val)) |
1068 |
|
1069 |
result = [] |
1070 |
if headers:
|
1071 |
args = [] |
1072 |
for idx, name in enumerate(fields): |
1073 |
hdr = headers[name] |
1074 |
if separator is None: |
1075 |
mlens[idx] = max(mlens[idx], len(hdr)) |
1076 |
args.append(mlens[idx]) |
1077 |
args.append(hdr) |
1078 |
result.append(format % tuple(args))
|
1079 |
|
1080 |
for line in data: |
1081 |
args = [] |
1082 |
if line is None: |
1083 |
line = ['-' for _ in fields] |
1084 |
for idx in xrange(len(fields)): |
1085 |
if separator is None: |
1086 |
args.append(mlens[idx]) |
1087 |
args.append(line[idx]) |
1088 |
result.append(format % tuple(args))
|
1089 |
|
1090 |
return result
|
1091 |
|
1092 |
|
1093 |
def FormatTimestamp(ts): |
1094 |
"""Formats a given timestamp.
|
1095 |
|
1096 |
@type ts: timestamp
|
1097 |
@param ts: a timeval-type timestamp, a tuple of seconds and microseconds
|
1098 |
|
1099 |
@rtype: string
|
1100 |
@return: a string with the formatted timestamp
|
1101 |
|
1102 |
"""
|
1103 |
if not isinstance (ts, (tuple, list)) or len(ts) != 2: |
1104 |
return '?' |
1105 |
sec, usec = ts |
1106 |
return time.strftime("%F %T", time.localtime(sec)) + ".%06d" % usec |
1107 |
|
1108 |
|
1109 |
def ParseTimespec(value): |
1110 |
"""Parse a time specification.
|
1111 |
|
1112 |
The following suffixed will be recognized:
|
1113 |
|
1114 |
- s: seconds
|
1115 |
- m: minutes
|
1116 |
- h: hours
|
1117 |
- d: day
|
1118 |
- w: weeks
|
1119 |
|
1120 |
Without any suffix, the value will be taken to be in seconds.
|
1121 |
|
1122 |
"""
|
1123 |
value = str(value)
|
1124 |
if not value: |
1125 |
raise errors.OpPrereqError("Empty time specification passed") |
1126 |
suffix_map = { |
1127 |
's': 1, |
1128 |
'm': 60, |
1129 |
'h': 3600, |
1130 |
'd': 86400, |
1131 |
'w': 604800, |
1132 |
} |
1133 |
if value[-1] not in suffix_map: |
1134 |
try:
|
1135 |
value = int(value)
|
1136 |
except ValueError: |
1137 |
raise errors.OpPrereqError("Invalid time specification '%s'" % value) |
1138 |
else:
|
1139 |
multiplier = suffix_map[value[-1]]
|
1140 |
value = value[:-1]
|
1141 |
if not value: # no data left after stripping the suffix |
1142 |
raise errors.OpPrereqError("Invalid time specification (only" |
1143 |
" suffix passed)")
|
1144 |
try:
|
1145 |
value = int(value) * multiplier
|
1146 |
except ValueError: |
1147 |
raise errors.OpPrereqError("Invalid time specification '%s'" % value) |
1148 |
return value
|
1149 |
|
1150 |
|
1151 |
def GetOnlineNodes(nodes, cl=None, nowarn=False): |
1152 |
"""Returns the names of online nodes.
|
1153 |
|
1154 |
This function will also log a warning on stderr with the names of
|
1155 |
the online nodes.
|
1156 |
|
1157 |
@param nodes: if not empty, use only this subset of nodes (minus the
|
1158 |
offline ones)
|
1159 |
@param cl: if not None, luxi client to use
|
1160 |
@type nowarn: boolean
|
1161 |
@param nowarn: by default, this function will output a note with the
|
1162 |
offline nodes that are skipped; if this parameter is True the
|
1163 |
note is not displayed
|
1164 |
|
1165 |
"""
|
1166 |
if cl is None: |
1167 |
cl = GetClient() |
1168 |
|
1169 |
result = cl.QueryNodes(names=nodes, fields=["name", "offline"], |
1170 |
use_locking=False)
|
1171 |
offline = [row[0] for row in result if row[1]] |
1172 |
if offline and not nowarn: |
1173 |
ToStderr("Note: skipping offline node(s): %s" % ", ".join(offline)) |
1174 |
return [row[0] for row in result if not row[1]] |
1175 |
|
1176 |
|
1177 |
def _ToStream(stream, txt, *args): |
1178 |
"""Write a message to a stream, bypassing the logging system
|
1179 |
|
1180 |
@type stream: file object
|
1181 |
@param stream: the file to which we should write
|
1182 |
@type txt: str
|
1183 |
@param txt: the message
|
1184 |
|
1185 |
"""
|
1186 |
if args:
|
1187 |
args = tuple(args)
|
1188 |
stream.write(txt % args) |
1189 |
else:
|
1190 |
stream.write(txt) |
1191 |
stream.write('\n')
|
1192 |
stream.flush() |
1193 |
|
1194 |
|
1195 |
def ToStdout(txt, *args): |
1196 |
"""Write a message to stdout only, bypassing the logging system
|
1197 |
|
1198 |
This is just a wrapper over _ToStream.
|
1199 |
|
1200 |
@type txt: str
|
1201 |
@param txt: the message
|
1202 |
|
1203 |
"""
|
1204 |
_ToStream(sys.stdout, txt, *args) |
1205 |
|
1206 |
|
1207 |
def ToStderr(txt, *args): |
1208 |
"""Write a message to stderr only, bypassing the logging system
|
1209 |
|
1210 |
This is just a wrapper over _ToStream.
|
1211 |
|
1212 |
@type txt: str
|
1213 |
@param txt: the message
|
1214 |
|
1215 |
"""
|
1216 |
_ToStream(sys.stderr, txt, *args) |
1217 |
|
1218 |
|
1219 |
class JobExecutor(object): |
1220 |
"""Class which manages the submission and execution of multiple jobs.
|
1221 |
|
1222 |
Note that instances of this class should not be reused between
|
1223 |
GetResults() calls.
|
1224 |
|
1225 |
"""
|
1226 |
def __init__(self, cl=None, verbose=True): |
1227 |
self.queue = []
|
1228 |
if cl is None: |
1229 |
cl = GetClient() |
1230 |
self.cl = cl
|
1231 |
self.verbose = verbose
|
1232 |
self.jobs = []
|
1233 |
|
1234 |
def QueueJob(self, name, *ops): |
1235 |
"""Record a job for later submit.
|
1236 |
|
1237 |
@type name: string
|
1238 |
@param name: a description of the job, will be used in WaitJobSet
|
1239 |
"""
|
1240 |
self.queue.append((name, ops))
|
1241 |
|
1242 |
def SubmitPending(self): |
1243 |
"""Submit all pending jobs.
|
1244 |
|
1245 |
"""
|
1246 |
results = self.cl.SubmitManyJobs([row[1] for row in self.queue]) |
1247 |
for ((status, data), (name, _)) in zip(results, self.queue): |
1248 |
self.jobs.append((status, data, name))
|
1249 |
|
1250 |
def GetResults(self): |
1251 |
"""Wait for and return the results of all jobs.
|
1252 |
|
1253 |
@rtype: list
|
1254 |
@return: list of tuples (success, job results), in the same order
|
1255 |
as the submitted jobs; if a job has failed, instead of the result
|
1256 |
there will be the error message
|
1257 |
|
1258 |
"""
|
1259 |
if not self.jobs: |
1260 |
self.SubmitPending()
|
1261 |
results = [] |
1262 |
if self.verbose: |
1263 |
ok_jobs = [row[1] for row in self.jobs if row[0]] |
1264 |
if ok_jobs:
|
1265 |
ToStdout("Submitted jobs %s", ", ".join(ok_jobs)) |
1266 |
for submit_status, jid, name in self.jobs: |
1267 |
if not submit_status: |
1268 |
ToStderr("Failed to submit job for %s: %s", name, jid)
|
1269 |
results.append((False, jid))
|
1270 |
continue
|
1271 |
if self.verbose: |
1272 |
ToStdout("Waiting for job %s for %s...", jid, name)
|
1273 |
try:
|
1274 |
job_result = PollJob(jid, cl=self.cl)
|
1275 |
success = True
|
1276 |
except (errors.GenericError, luxi.ProtocolError), err:
|
1277 |
_, job_result = FormatError(err) |
1278 |
success = False
|
1279 |
# the error message will always be shown, verbose or not
|
1280 |
ToStderr("Job %s for %s has failed: %s", jid, name, job_result)
|
1281 |
|
1282 |
results.append((success, job_result)) |
1283 |
return results
|
1284 |
|
1285 |
def WaitOrShow(self, wait): |
1286 |
"""Wait for job results or only print the job IDs.
|
1287 |
|
1288 |
@type wait: boolean
|
1289 |
@param wait: whether to wait or not
|
1290 |
|
1291 |
"""
|
1292 |
if wait:
|
1293 |
return self.GetResults() |
1294 |
else:
|
1295 |
if not self.jobs: |
1296 |
self.SubmitPending()
|
1297 |
for status, result, name in self.jobs: |
1298 |
if status:
|
1299 |
ToStdout("%s: %s", result, name)
|
1300 |
else:
|
1301 |
ToStderr("Failure for %s: %s", name, result)
|