root / qa / qa_config.py @ d5af1f95
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# Copyright (C) 2007, 2011, 2012 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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cfg = None
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options = None
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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 cfg # pylint: disable=W0603 |
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cfg = serializer.LoadJson(utils.ReadFile(path)) |
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Validate() |
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def Validate(): |
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if len(cfg["nodes"]) < 1: |
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raise qa_error.Error("Need at least one node") |
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if len(cfg["instances"]) < 1: |
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raise qa_error.Error("Need at least one instance") |
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if len(cfg["disk"]) != len(cfg["disk-growth"]): |
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raise qa_error.Error("Config options 'disk' and 'disk-growth' must have" |
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" the same number of items")
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check = 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(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 get(name, default=None): |
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return cfg.get(name, default) # pylint: disable=E1103 |
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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 = cfg |
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# Get settings for all tests
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cfg_tests = _cfg.get("tests", {}) # pylint: disable=E1103 |
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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(): |
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"""Returns path to instance check script or C{None}.
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"""
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return cfg.get(_INSTANCE_CHECK_KEY, None) # pylint: disable=E1103 |
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def GetEnabledHypervisors(): |
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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 = cfg[_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 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(): |
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"""Returns the default hypervisor to be used.
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"""
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return GetEnabledHypervisors()[0] |
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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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return cfg["nodes"][0] |
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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, cfg["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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return inst
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def ReleaseInstance(inst): |
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inst["_used"] = False |
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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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# 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 ReleaseNode(node): |
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node["_count"] = node.get("_count", 0) - 1 |