X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/02f99608dd26b7e91953630870585cd1a431d20b..5ef699a0e7696222e92e653b1e0028043efd9876:/lib/ssconf.py?ds=sidebyside diff --git a/lib/ssconf.py b/lib/ssconf.py index b800f25..c29d63c 100644 --- a/lib/ssconf.py +++ b/lib/ssconf.py @@ -26,13 +26,21 @@ configuration data, which is mostly static and available to all nodes. """ -import socket import sys +import re +import os from ganeti import errors from ganeti import constants from ganeti import utils from ganeti import serializer +from ganeti import objects +from ganeti import netutils + + +SSCONF_LOCK_TIMEOUT = 10 + +RE_VALID_SSCONF_NAME = re.compile(r'^[-_a-z0-9]+$') class SimpleConfigReader(object): @@ -47,8 +55,86 @@ class SimpleConfigReader(object): """ self._file_name = file_name - self._config_data = serializer.Load(utils.ReadFile(file_name)) - # TODO: Error handling + self._last_inode = None + self._last_mtime = None + self._last_size = None + + self._config_data = None + self._inst_ips_by_link = None + self._ip_to_inst_by_link = None + self._instances_ips = None + self._mc_primary_ips = None + self._nodes_primary_ips = None + + # we need a forced reload at class init time, to initialize _last_* + self._Load(force=True) + + def _Load(self, force=False): + """Loads (or reloads) the config file. + + @type force: boolean + @param force: whether to force the reload without checking the mtime + @rtype: boolean + @return: boolean value that says whether we reloaded the configuration or + not (because we decided it was already up-to-date) + + """ + try: + cfg_stat = os.stat(self._file_name) + except EnvironmentError, err: + raise errors.ConfigurationError("Cannot stat config file %s: %s" % + (self._file_name, err)) + inode = cfg_stat.st_ino + mtime = cfg_stat.st_mtime + size = cfg_stat.st_size + + if (force or inode != self._last_inode or + mtime > self._last_mtime or + size != self._last_size): + self._last_inode = inode + self._last_mtime = mtime + self._last_size = size + else: + # Don't reload + return False + + try: + self._config_data = serializer.Load(utils.ReadFile(self._file_name)) + except EnvironmentError, err: + raise errors.ConfigurationError("Cannot read config file %s: %s" % + (self._file_name, err)) + except ValueError, err: + raise errors.ConfigurationError("Cannot load config file %s: %s" % + (self._file_name, err)) + + self._ip_to_inst_by_link = {} + self._instances_ips = [] + self._inst_ips_by_link = {} + c_nparams = self._config_data['cluster']['nicparams'][constants.PP_DEFAULT] + for iname in self._config_data['instances']: + instance = self._config_data['instances'][iname] + for nic in instance['nics']: + if 'ip' in nic and nic['ip']: + params = objects.FillDict(c_nparams, nic['nicparams']) + if not params['link'] in self._inst_ips_by_link: + self._inst_ips_by_link[params['link']] = [] + self._ip_to_inst_by_link[params['link']] = {} + self._ip_to_inst_by_link[params['link']][nic['ip']] = iname + self._inst_ips_by_link[params['link']].append(nic['ip']) + + self._nodes_primary_ips = [] + self._mc_primary_ips = [] + for node_name in self._config_data["nodes"]: + node = self._config_data["nodes"][node_name] + self._nodes_primary_ips.append(node["primary_ip"]) + if node["master_candidate"]: + self._mc_primary_ips.append(node["primary_ip"]) + + return True + + # Clients can request a reload of the config file, so we export our internal + # _Load function as Reload. + Reload = _Load def GetClusterName(self): return self._config_data["cluster"]["cluster_name"] @@ -68,43 +154,311 @@ class SimpleConfigReader(object): def GetFileStorageDir(self): return self._config_data["cluster"]["file_storage_dir"] - def GetHypervisorType(self): - return self._config_data["cluster"]["hypervisor"] - def GetNodeList(self): return self._config_data["nodes"].keys() - @classmethod - def FromDict(cls, val, cfg_file=constants.CLUSTER_CONF_FILE): - """Alternative construction from a dictionary. + def GetConfigSerialNo(self): + return self._config_data["serial_no"] + + def GetClusterSerialNo(self): + return self._config_data["cluster"]["serial_no"] + + def GetDefaultNicParams(self): + return self._config_data["cluster"]["nicparams"][constants.PP_DEFAULT] + + def GetDefaultNicLink(self): + return self.GetDefaultNicParams()[constants.NIC_LINK] + + def GetNodeStatusFlags(self, node): + """Get a node's status flags + + @type node: string + @param node: node name + @rtype: (bool, bool, bool) + @return: (master_candidate, drained, offline) (or None if no such node) + + """ + if node not in self._config_data["nodes"]: + return None + + master_candidate = self._config_data["nodes"][node]["master_candidate"] + drained = self._config_data["nodes"][node]["drained"] + offline = self._config_data["nodes"][node]["offline"] + return master_candidate, drained, offline + + def GetInstanceByLinkIp(self, ip, link): + """Get instance name from its link and ip address. + + @type ip: string + @param ip: ip address + @type link: string + @param link: nic link + @rtype: string + @return: instance name + + """ + if not link: + link = self.GetDefaultNicLink() + if not link in self._ip_to_inst_by_link: + return None + if not ip in self._ip_to_inst_by_link[link]: + return None + return self._ip_to_inst_by_link[link][ip] + + def GetNodePrimaryIp(self, node): + """Get a node's primary ip + + @type node: string + @param node: node name + @rtype: string, or None + @return: node's primary ip, or None if no such node """ - obj = SimpleConfigReader.__new__(cls) - obj._config_data = val - obj._file_name = cfg_file - return obj + if node not in self._config_data["nodes"]: + return None + return self._config_data["nodes"][node]["primary_ip"] + + def GetInstancePrimaryNode(self, instance): + """Get an instance's primary node + @type instance: string + @param instance: instance name + @rtype: string, or None + @return: primary node, or None if no such instance -class SimpleConfigWriter(SimpleConfigReader): - """Simple class to write configuration file. + """ + if instance not in self._config_data["instances"]: + return None + return self._config_data["instances"][instance]["primary_node"] + + def GetNodesPrimaryIps(self): + return self._nodes_primary_ips + + def GetMasterCandidatesPrimaryIps(self): + return self._mc_primary_ips + + def GetInstancesIps(self, link): + """Get list of nic ips connected to a certain link. + + @type link: string + @param link: nic link + @rtype: list + @return: list of ips connected to that link + + """ + if not link: + link = self.GetDefaultNicLink() + + if link in self._inst_ips_by_link: + return self._inst_ips_by_link[link] + else: + return [] + + +class SimpleStore(object): + """Interface to static cluster data. + + This is different that the config.ConfigWriter and + SimpleConfigReader classes in that it holds data that will always be + present, even on nodes which don't have all the cluster data. + + Other particularities of the datastore: + - keys are restricted to predefined values """ - def SetMasterNode(self, node): - """Change master node. + _SS_FILEPREFIX = "ssconf_" + _VALID_KEYS = ( + constants.SS_CLUSTER_NAME, + constants.SS_CLUSTER_TAGS, + constants.SS_FILE_STORAGE_DIR, + constants.SS_MASTER_CANDIDATES, + constants.SS_MASTER_CANDIDATES_IPS, + constants.SS_MASTER_IP, + constants.SS_MASTER_NETDEV, + constants.SS_MASTER_NODE, + constants.SS_NODE_LIST, + constants.SS_NODE_PRIMARY_IPS, + constants.SS_NODE_SECONDARY_IPS, + constants.SS_OFFLINE_NODES, + constants.SS_ONLINE_NODES, + constants.SS_INSTANCE_LIST, + constants.SS_RELEASE_VERSION, + constants.SS_HYPERVISOR_LIST, + constants.SS_MAINTAIN_NODE_HEALTH, + constants.SS_UID_POOL, + ) + _MAX_SIZE = 131072 + + def __init__(self, cfg_location=None): + if cfg_location is None: + self._cfg_dir = constants.DATA_DIR + else: + self._cfg_dir = cfg_location + + def KeyToFilename(self, key): + """Convert a given key into filename. + + """ + if key not in self._VALID_KEYS: + raise errors.ProgrammerError("Invalid key requested from SSConf: '%s'" + % str(key)) + + filename = self._cfg_dir + '/' + self._SS_FILEPREFIX + key + return filename + + def _ReadFile(self, key): + """Generic routine to read keys. + + This will read the file which holds the value requested. Errors + will be changed into ConfigurationErrors. + + """ + filename = self.KeyToFilename(key) + try: + data = utils.ReadFile(filename, size=self._MAX_SIZE) + except EnvironmentError, err: + raise errors.ConfigurationError("Can't read from the ssconf file:" + " '%s'" % str(err)) + data = data.rstrip('\n') + return data + + def WriteFiles(self, values): + """Writes ssconf files used by external scripts. + + @type values: dict + @param values: Dictionary of (name, value) + + """ + ssconf_lock = utils.FileLock.Open(constants.SSCONF_LOCK_FILE) + + # Get lock while writing files + ssconf_lock.Exclusive(blocking=True, timeout=SSCONF_LOCK_TIMEOUT) + try: + for name, value in values.iteritems(): + if value and not value.endswith("\n"): + value += "\n" + if len(value) > self._MAX_SIZE: + raise errors.ConfigurationError("ssconf file %s above maximum size" % + name) + utils.WriteFile(self.KeyToFilename(name), data=value, mode=0444) + finally: + ssconf_lock.Unlock() + + def GetFileList(self): + """Return the list of all config files. + + This is used for computing node replication data. + + """ + return [self.KeyToFilename(key) for key in self._VALID_KEYS] + + def GetClusterName(self): + """Get the cluster name. + + """ + return self._ReadFile(constants.SS_CLUSTER_NAME) + + def GetFileStorageDir(self): + """Get the file storage dir. + + """ + return self._ReadFile(constants.SS_FILE_STORAGE_DIR) + + def GetMasterCandidates(self): + """Return the list of master candidates. + + """ + data = self._ReadFile(constants.SS_MASTER_CANDIDATES) + nl = data.splitlines(False) + return nl + + def GetMasterCandidatesIPList(self): + """Return the list of master candidates' primary IP. + + """ + data = self._ReadFile(constants.SS_MASTER_CANDIDATES_IPS) + nl = data.splitlines(False) + return nl + + def GetMasterIP(self): + """Get the IP of the master node for this cluster. """ - self._config_data["cluster"]["master_node"] = node + return self._ReadFile(constants.SS_MASTER_IP) + + def GetMasterNetdev(self): + """Get the netdev to which we'll add the master ip. - def Save(self): - """Writes configuration file. + """ + return self._ReadFile(constants.SS_MASTER_NETDEV) - Warning: Doesn't take care of locking or synchronizing with other - processes. + def GetMasterNode(self): + """Get the hostname of the master node for this cluster. """ - utils.WriteFile(self._file_name, - data=serializer.Dump(self._config_data), - mode=0600) + return self._ReadFile(constants.SS_MASTER_NODE) + + def GetNodeList(self): + """Return the list of cluster nodes. + + """ + data = self._ReadFile(constants.SS_NODE_LIST) + nl = data.splitlines(False) + return nl + + def GetNodePrimaryIPList(self): + """Return the list of cluster nodes' primary IP. + + """ + data = self._ReadFile(constants.SS_NODE_PRIMARY_IPS) + nl = data.splitlines(False) + return nl + + def GetNodeSecondaryIPList(self): + """Return the list of cluster nodes' secondary IP. + + """ + data = self._ReadFile(constants.SS_NODE_SECONDARY_IPS) + nl = data.splitlines(False) + return nl + + def GetClusterTags(self): + """Return the cluster tags. + + """ + data = self._ReadFile(constants.SS_CLUSTER_TAGS) + nl = data.splitlines(False) + return nl + + def GetHypervisorList(self): + """Return the list of enabled hypervisors. + + """ + data = self._ReadFile(constants.SS_HYPERVISOR_LIST) + nl = data.splitlines(False) + return nl + + def GetMaintainNodeHealth(self): + """Return the value of the maintain_node_health option. + + """ + data = self._ReadFile(constants.SS_MAINTAIN_NODE_HEALTH) + # we rely on the bool serialization here + return data == "True" + + def GetUidPool(self): + """Return the user-id pool definition string. + + The separator character is a newline. + + The return value can be parsed using uidpool.ParseUidPool():: + + ss = ssconf.SimpleStore() + uid_pool = uidpool.ParseUidPool(ss.GetUidPool(), separator="\\n") + + """ + data = self._ReadFile(constants.SS_UID_POOL) + return data def GetMasterAndMyself(ss=None): @@ -116,10 +470,15 @@ def GetMasterAndMyself(ss=None): The function does not handle any errors, these should be handled in the caller (errors.ConfigurationError, errors.ResolverError). + @param ss: either a sstore.SimpleConfigReader or a + sstore.SimpleStore instance + @rtype: tuple + @return: a tuple (master node name, my own name) + """ if ss is None: - ss = SimpleConfigReader() - return ss.GetMasterNode(), utils.HostInfo().name + ss = SimpleStore() + return ss.GetMasterNode(), netutils.HostInfo().name def CheckMaster(debug, ss=None):