root / qa / qa_config.py @ 8a96c5a6
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# Copyright (C) 2007, 2011, 2012, 2013 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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"""QA configuration.
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"""
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import os |
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from ganeti import constants |
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from ganeti import utils |
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from ganeti import serializer |
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from ganeti import compat |
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import qa_error |
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_INSTANCE_CHECK_KEY = "instance-check"
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_ENABLED_HV_KEY = "enabled-hypervisors"
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#: Cluster-wide run-time value of the exclusive storage flag
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_exclusive_storage = None
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#: QA configuration (L{_QaConfig})
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_config = None
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class _QaConfig(object): |
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def __init__(self, data): |
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"""Initializes instances of this class.
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"""
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self._data = data
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@classmethod
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def Load(cls, filename): |
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"""Loads a configuration file and produces a configuration object.
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@type filename: string
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@param filename: Path to configuration file
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@rtype: L{_QaConfig}
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"""
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data = serializer.LoadJson(utils.ReadFile(filename)) |
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result = cls(data) |
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result.Validate() |
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return result
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def Validate(self): |
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"""Validates loaded configuration data.
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"""
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if not self.get("nodes"): |
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raise qa_error.Error("Need at least one node") |
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if not self.get("instances"): |
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raise qa_error.Error("Need at least one instance") |
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if (self.get("disk") is None or |
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self.get("disk-growth") is None or |
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len(self.get("disk")) != len(self.get("disk-growth"))): |
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raise qa_error.Error("Config options 'disk' and 'disk-growth' must exist" |
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" and have the same number of items")
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check = self.GetInstanceCheckScript()
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if check:
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try:
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os.stat(check) |
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except EnvironmentError, err: |
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raise qa_error.Error("Can't find instance check script '%s': %s" % |
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(check, err)) |
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enabled_hv = frozenset(self.GetEnabledHypervisors()) |
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if not enabled_hv: |
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raise qa_error.Error("No hypervisor is enabled") |
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difference = enabled_hv - constants.HYPER_TYPES |
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if difference:
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raise qa_error.Error("Unknown hypervisor(s) enabled: %s" % |
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utils.CommaJoin(difference)) |
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def __getitem__(self, name): |
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"""Returns configuration value.
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@type name: string
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@param name: Name of configuration entry
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"""
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return self._data[name] |
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def get(self, name, default=None): |
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"""Returns configuration value.
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@type name: string
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@param name: Name of configuration entry
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@param default: Default value
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"""
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return self._data.get(name, default) |
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def GetMasterNode(self): |
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"""Returns the default master node for the cluster.
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"""
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return self["nodes"][0] |
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def GetInstanceCheckScript(self): |
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"""Returns path to instance check script or C{None}.
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"""
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return self._data.get(_INSTANCE_CHECK_KEY, None) |
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def GetEnabledHypervisors(self): |
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"""Returns list of enabled hypervisors.
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@rtype: list
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"""
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try:
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value = self._data[_ENABLED_HV_KEY]
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except KeyError: |
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return [constants.DEFAULT_ENABLED_HYPERVISOR]
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else:
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if value is None: |
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return []
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elif isinstance(value, basestring): |
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# The configuration key ("enabled-hypervisors") implies there can be
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# multiple values. Multiple hypervisors are comma-separated on the
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# command line option to "gnt-cluster init", so we need to handle them
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# equally here.
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return value.split(",") |
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else:
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return value
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def GetDefaultHypervisor(self): |
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"""Returns the default hypervisor to be used.
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"""
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return self.GetEnabledHypervisors()[0] |
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def Load(path): |
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"""Loads the passed configuration file.
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"""
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global _config # pylint: disable=W0603 |
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_config = _QaConfig.Load(path) |
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def GetConfig(): |
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"""Returns the configuration object.
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"""
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if _config is None: |
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raise RuntimeError("Configuration not yet loaded") |
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return _config
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def get(name, default=None): |
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"""Wrapper for L{_QaConfig.get}.
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"""
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return GetConfig().get(name, default=default)
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class Either: |
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def __init__(self, tests): |
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"""Initializes this class.
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@type tests: list or string
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@param tests: List of test names
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@see: L{TestEnabled} for details
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"""
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self.tests = tests
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def _MakeSequence(value): |
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"""Make sequence of single argument.
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If the single argument is not already a list or tuple, a list with the
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argument as a single item is returned.
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"""
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if isinstance(value, (list, tuple)): |
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return value
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else:
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return [value]
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def _TestEnabledInner(check_fn, names, fn): |
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"""Evaluate test conditions.
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@type check_fn: callable
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@param check_fn: Callback to check whether a test is enabled
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@type names: sequence or string
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@param names: Test name(s)
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@type fn: callable
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@param fn: Aggregation function
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@rtype: bool
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@return: Whether test is enabled
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"""
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names = _MakeSequence(names) |
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result = [] |
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for name in names: |
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if isinstance(name, Either): |
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value = _TestEnabledInner(check_fn, name.tests, compat.any) |
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elif isinstance(name, (list, tuple)): |
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value = _TestEnabledInner(check_fn, name, compat.all) |
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else:
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value = check_fn(name) |
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result.append(value) |
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return fn(result)
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def TestEnabled(tests, _cfg=None): |
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"""Returns True if the given tests are enabled.
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@param tests: A single test as a string, or a list of tests to check; can
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contain L{Either} for OR conditions, AND is default
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"""
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if _cfg is None: |
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cfg = GetConfig() |
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else:
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cfg = _cfg |
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# Get settings for all tests
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cfg_tests = cfg.get("tests", {})
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# Get default setting
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default = cfg_tests.get("default", True) |
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return _TestEnabledInner(lambda name: cfg_tests.get(name, default), |
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tests, compat.all) |
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def GetInstanceCheckScript(*args): |
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"""Wrapper for L{_QaConfig.GetInstanceCheckScript}.
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"""
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return GetConfig().GetInstanceCheckScript(*args)
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def GetEnabledHypervisors(*args): |
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"""Wrapper for L{_QaConfig.GetEnabledHypervisors}.
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"""
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return GetConfig().GetEnabledHypervisors(*args)
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def GetDefaultHypervisor(*args): |
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"""Wrapper for L{_QaConfig.GetDefaultHypervisor}.
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"""
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return GetConfig().GetDefaultHypervisor(*args)
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def GetInstanceNicMac(inst, default=None): |
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"""Returns MAC address for instance's network interface.
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"""
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return inst.get("nic.mac/0", default) |
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def GetMasterNode(): |
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"""Wrapper for L{_QaConfig.GetMasterNode}.
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"""
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return GetConfig().GetMasterNode()
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def AcquireInstance(): |
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"""Returns an instance which isn't in use.
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"""
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# Filter out unwanted instances
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tmp_flt = lambda inst: not inst.get("_used", False) |
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instances = filter(tmp_flt, GetConfig()["instances"]) |
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del tmp_flt
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if len(instances) == 0: |
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raise qa_error.OutOfInstancesError("No instances left") |
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inst = instances[0]
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inst["_used"] = True |
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inst["_template"] = None |
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return inst
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def ReleaseInstance(inst): |
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inst["_used"] = False |
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def GetInstanceTemplate(inst): |
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"""Return the disk template of an instance.
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"""
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templ = inst["_template"]
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assert templ is not None |
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return templ
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def SetInstanceTemplate(inst, template): |
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"""Set the disk template for an instance.
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"""
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inst["_template"] = template
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def SetExclusiveStorage(value): |
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"""Set the expected value of the exclusive_storage flag for the cluster.
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"""
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global _exclusive_storage # pylint: disable=W0603 |
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_exclusive_storage = bool(value)
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def GetExclusiveStorage(): |
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"""Get the expected value of the exclusive_storage flag for the cluster.
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"""
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val = _exclusive_storage |
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assert val is not None |
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return val
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def IsTemplateSupported(templ): |
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"""Is the given disk template supported by the current configuration?
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"""
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if GetExclusiveStorage():
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return templ in constants.DTS_EXCL_STORAGE |
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else:
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return True |
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def AcquireNode(exclude=None): |
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"""Returns the least used node.
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"""
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master = GetMasterNode() |
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cfg = GetConfig() |
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# Filter out unwanted nodes
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# TODO: Maybe combine filters
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if exclude is None: |
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nodes = cfg["nodes"][:]
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elif isinstance(exclude, (list, tuple)): |
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nodes = filter(lambda node: node not in exclude, cfg["nodes"]) |
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else:
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nodes = filter(lambda node: node != exclude, cfg["nodes"]) |
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tmp_flt = lambda node: node.get("_added", False) or node == master |
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nodes = filter(tmp_flt, nodes)
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del tmp_flt
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if len(nodes) == 0: |
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raise qa_error.OutOfNodesError("No nodes left") |
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# Get node with least number of uses
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def compare(a, b): |
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result = cmp(a.get("_count", 0), b.get("_count", 0)) |
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if result == 0: |
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result = cmp(a["primary"], b["primary"]) |
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return result
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nodes.sort(cmp=compare) |
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node = nodes[0]
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node["_count"] = node.get("_count", 0) + 1 |
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return node
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def AcquireManyNodes(num, exclude=None): |
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"""Return the least used nodes.
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@type num: int
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@param num: Number of nodes; can be 0.
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@type exclude: list of nodes or C{None}
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@param exclude: nodes to be excluded from the choice
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@rtype: list of nodes
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@return: C{num} different nodes
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"""
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nodes = [] |
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if exclude is None: |
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exclude = [] |
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elif isinstance(exclude, (list, tuple)): |
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# Don't modify the incoming argument
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exclude = list(exclude)
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else:
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exclude = [exclude] |
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try:
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for _ in range(0, num): |
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n = AcquireNode(exclude=exclude) |
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nodes.append(n) |
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exclude.append(n) |
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except qa_error.OutOfNodesError:
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ReleaseManyNodes(nodes) |
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raise
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return nodes
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def ReleaseNode(node): |
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node["_count"] = node.get("_count", 0) - 1 |
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def ReleaseManyNodes(nodes): |
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for n in nodes: |
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ReleaseNode(n) |