from contextlib import contextmanager from datetime import datetime from os.path import join from .classes import SpecificEtcdEntryBase class VMStatus: stopped = "STOPPED" # After requested_shutdown killed = "KILLED" # either host died or vm died itself running = "RUNNING" error = "ERROR" # An error occurred that cannot be resolved automatically def declare_stopped(vm): vm['hostname'] = '' vm['in_migration'] = False vm['status'] = VMStatus.stopped class VMEntry(SpecificEtcdEntryBase): def __init__(self, e): self.owner = None # type: str self.specs = None # type: dict self.hostname = None # type: str self.status = None # type: str self.image_uuid = None # type: str self.log = None # type: list self.in_migration = None # type: bool super().__init__(e) @property def uuid(self): return self.key.split("/")[-1] def declare_killed(self): self.hostname = "" self.in_migration = False if self.status == VMStatus.running: self.status = VMStatus.killed def declare_stopped(self): self.hostname = "" self.in_migration = False self.status = VMStatus.stopped def add_log(self, msg): self.log = self.log[:5] self.log.append("{} - {}".format(datetime.now().isoformat(), msg)) class VmPool: def __init__(self, etcd_client, vm_prefix): self.client = etcd_client self.prefix = vm_prefix @property def vms(self): _vms = self.client.get_prefix(self.prefix, value_in_json=True) return [VMEntry(vm) for vm in _vms] def by_host(self, host, _vms=None): if _vms is None: _vms = self.vms return list(filter(lambda x: x.hostname == host, _vms)) def by_status(self, status, _vms=None): if _vms is None: _vms = self.vms return list(filter(lambda x: x.status == status, _vms)) def by_owner(self, owner, _vms=None): if _vms is None: _vms = self.vms return list(filter(lambda x: x.owner == owner, _vms)) def except_status(self, status, _vms=None): if _vms is None: _vms = self.vms return list(filter(lambda x: x.status != status, _vms)) def get(self, key): if not key.startswith(self.prefix): key = join(self.prefix, key) v = self.client.get(key, value_in_json=True) if v: return VMEntry(v) return None def put(self, obj: VMEntry): self.client.put(obj.key, obj.value, value_in_json=True) @contextmanager def get_put(self, key) -> VMEntry: # Updates object at key on exit obj = self.get(key) yield obj if obj: self.put(obj)