274 lines
11 KiB
Python
274 lines
11 KiB
Python
"""
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xenconfig.py: Implementation of the XenConfigManager class for managing
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configurable items for XenNodes.
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Configuration for a XenNode is available at these three levels:
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Global config: XenConfigManager.configs[0] = (type='xen', values)
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Nodes of this machine type have this config. These are the default values.
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XenConfigManager.default_config comes from defaults + xen.conf
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Node type config: XenConfigManager.configs[0] = (type='mytype', values)
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All nodes of this type have this config.
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Node-specific config: XenConfigManager.configs[nodenumber] = (type, values)
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The node having this specific number has this config.
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"""
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import ConfigParser
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import os
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import string
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from core import constants
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from core.api import coreapi
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from core.conf import Configurable
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from core.conf import ConfigurableManager
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from core.enumerations import ConfigDataTypes
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from core.enumerations import ConfigFlags
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from core.enumerations import ConfigTlvs
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from core.enumerations import RegisterTlvs
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from core.misc import log
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logger = log.get_logger(__name__)
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class XenConfigManager(ConfigurableManager):
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"""
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Xen controller object. Lives in a Session instance and is used for
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building Xen profiles.
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"""
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name = "xen"
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config_type = RegisterTlvs.EMULATION_SERVER.value
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def __init__(self, session):
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"""
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Creates a XenConfigManager instance.
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:param core.session.Session session: session this manager is tied to
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:return: nothing
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"""
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ConfigurableManager.__init__(self)
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self.default_config = XenDefaultConfig(session, object_id=None)
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self.loadconfigfile()
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def setconfig(self, nodenum, conftype, values):
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"""
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add configuration values for a node to a dictionary; values are
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usually received from a Configuration Message, and may refer to a
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node for which no object exists yet
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"""
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if nodenum is None:
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nodenum = 0 # used for storing the global default config
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return ConfigurableManager.setconfig(self, nodenum, conftype, values)
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def getconfig(self, nodenum, conftype, defaultvalues):
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"""
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get configuration values for a node; if the values don't exist in
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our dictionary then return the default values supplied; if conftype
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is None then we return a match on any conftype.
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"""
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if nodenum is None:
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nodenum = 0 # used for storing the global default config
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return ConfigurableManager.getconfig(self, nodenum, conftype, defaultvalues)
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def clearconfig(self, nodenum):
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"""
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remove configuration values for a node
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"""
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ConfigurableManager.clearconfig(self, nodenum)
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if 0 in self.configs:
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self.configs.pop(0)
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def configure(self, session, config_data):
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"""
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Handle configuration messages for global Xen config.
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:param core.conf.ConfigData config_data: configuration data for carrying out a configuration
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"""
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return self.default_config.configure(self, config_data)
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def loadconfigfile(self, filename=None):
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"""
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Load defaults from the /etc/core/xen.conf file into dict object.
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"""
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if filename is None:
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filename = os.path.join(constants.CORE_CONF_DIR, 'xen.conf')
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cfg = ConfigParser.SafeConfigParser()
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if filename not in cfg.read(filename):
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logger.warn("unable to read Xen config file: %s" % filename)
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return
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section = "xen"
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if not cfg.has_section(section):
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logger.warn("%s is missing a xen section!" % filename)
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return
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self.configfile = dict(cfg.items(section))
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# populate default config items from config file entries
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vals = list(self.default_config.getdefaultvalues())
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names = self.default_config.getnames()
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for i in range(len(names)):
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if names[i] in self.configfile:
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vals[i] = self.configfile[names[i]]
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# this sets XenConfigManager.configs[0] = (type='xen', vals)
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self.setconfig(None, self.default_config.name, vals)
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def getconfigitem(self, name, model=None, node=None, value=None):
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"""
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Get a config item of the given name, first looking for node-specific
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configuration, then model specific, and finally global defaults.
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If a value is supplied, it will override any stored config.
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"""
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if value is not None:
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return value
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n = None
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if node:
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n = node.objid
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(t, v) = self.getconfig(nodenum=n, conftype=model, defaultvalues=None)
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if n is not None and v is None:
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# get item from default config for the node type
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(t, v) = self.getconfig(nodenum=None, conftype=model,
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defaultvalues=None)
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if v is None:
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# get item from default config for the machine type
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(t, v) = self.getconfig(nodenum=None,
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conftype=self.default_config.name,
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defaultvalues=None)
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confignames = self.default_config.getnames()
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if v and name in confignames:
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i = confignames.index(name)
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return v[i]
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else:
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# name may only exist in config file
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if name in self.configfile:
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return self.configfile[name]
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else:
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# logger.warn("missing config item '%s'" % name)
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return None
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class XenConfig(Configurable):
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"""
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Manage Xen configuration profiles.
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"""
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@classmethod
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def configure(cls, xen, config_data):
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"""
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Handle configuration messages for setting up a model.
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Similar to Configurable.configure(), but considers opaque data
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for indicating node types.
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:param xen: xen instance to configure
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:param core.conf.ConfigData config_data: configuration data for carrying out a configuration
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"""
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reply = None
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node_id = config_data.node
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object_name = config_data.object
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config_type = config_data.type
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opaque = config_data.opaque
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values_str = config_data.data_values
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nodetype = object_name
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if opaque is not None:
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opaque_items = opaque.split(':')
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if len(opaque_items) != 2:
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logger.warn("xen config: invalid opaque data in conf message")
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return None
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nodetype = opaque_items[1]
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logger.info("received configure message for %s", nodetype)
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if config_type == ConfigFlags.REQUEST.value:
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logger.info("replying to configure request for %s " % nodetype)
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# when object name is "all", the reply to this request may be None
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# if this node has not been configured for this model; otherwise we
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# reply with the defaults for this model
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if object_name == "all":
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typeflags = ConfigFlags.UPDATE.value
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else:
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typeflags = ConfigFlags.NONE.value
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values = xen.getconfig(node_id, nodetype, defaultvalues=None)[1]
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if values is None:
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# get defaults from default "xen" config which includes
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# settings from both cls._confdefaultvalues and xen.conf
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defaults = cls.getdefaultvalues()
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values = xen.getconfig(node_id, cls.name, defaults)[1]
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if values is None:
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return None
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# reply with config options
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if node_id is None:
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node_id = 0
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reply = cls.config_data(0, node_id, typeflags, nodetype, values)
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elif config_type == ConfigFlags.RESET.value:
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if object_name == "all":
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xen.clearconfig(node_id)
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# elif conftype == coreapi.CONF_TYPE_FLAGS_UPDATE:
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else:
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# store the configuration values for later use, when the XenNode
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# object has been created
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if object_name is None:
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logger.info("no configuration object for node %s" % node_id)
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return None
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if values_str is None:
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# use default or preconfigured values
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defaults = cls.getdefaultvalues()
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values = xen.getconfig(node_id, cls.name, defaults)[1]
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else:
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# use new values supplied from the conf message
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values = values_str.split('|')
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xen.setconfig(node_id, nodetype, values)
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return reply
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@classmethod
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def config_data(cls, flags, node_id, type_flags, nodetype, values):
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"""
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Convert this class to a Config API message. Some TLVs are defined
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by the class, but node number, conf type flags, and values must
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be passed in.
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"""
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values_str = string.join(values, '|')
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tlvdata = ""
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.NODE.value, node_id)
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.OBJECT.value, cls.name)
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.TYPE.value, type_flags)
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datatypes = tuple(map(lambda x: x[1], cls.config_matrix))
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.DATA_TYPES.value, datatypes)
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.VALUES.value, values_str)
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captions = reduce(lambda a, b: a + '|' + b, map(lambda x: x[4], cls.config_matrix))
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.CAPTIONS, captions)
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possiblevals = reduce(lambda a, b: a + '|' + b, map(lambda x: x[3], cls.config_matrix))
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.POSSIBLE_VALUES.value, possiblevals)
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if cls.bitmap is not None:
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.BITMAP.value, cls.bitmap)
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if cls.config_groups is not None:
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.GROUPS.value, cls.config_groups)
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opaque = "%s:%s" % (cls.name, nodetype)
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tlvdata += coreapi.CoreConfigTlv.pack(ConfigTlvs.OPAQUE.value, opaque)
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msg = coreapi.CoreConfMessage.pack(flags, tlvdata)
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return msg
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class XenDefaultConfig(XenConfig):
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"""
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Global default Xen configuration options.
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"""
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name = "xen"
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# Configuration items:
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# ('name', 'type', 'default', 'possible-value-list', 'caption')
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config_matrix = [
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('ram_size', ConfigDataTypes.STRING.value, '256', '',
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'ram size (MB)'),
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('disk_size', ConfigDataTypes.STRING.value, '256M', '',
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'disk size (use K/M/G suffix)'),
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('iso_file', ConfigDataTypes.STRING.value, '', '',
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'iso file'),
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('mount_path', ConfigDataTypes.STRING.value, '', '',
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'mount path'),
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('etc_path', ConfigDataTypes.STRING.value, '', '',
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'etc path'),
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('persist_tar_iso', ConfigDataTypes.STRING.value, '', '',
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'iso persist tar file'),
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('persist_tar', ConfigDataTypes.STRING.value, '', '',
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'persist tar file'),
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('root_password', ConfigDataTypes.STRING.value, 'password', '',
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'root password'),
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]
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config_groups = "domU properties:1-%d" % len(config_matrix)
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