760 lines
26 KiB
Python
760 lines
26 KiB
Python
# Copyright (C) 2011-2014 OpenStack Foundation
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# Copyright (C) 2017 Red Hat
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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#
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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import collections
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import inspect
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import importlib
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import logging
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import math
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import os
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import time
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import threading
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from kazoo import exceptions as kze
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from nodepool import zk
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from nodepool import exceptions
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from nodepool import stats
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class Drivers:
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"""The Drivers plugin interface"""
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log = logging.getLogger("nodepool.driver.Drivers")
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drivers = {}
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drivers_paths = None
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@staticmethod
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def _load_class(driver_name, path, parent_class):
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"""Return a driver class that implements the parent_class"""
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spec = importlib.util.spec_from_file_location(driver_name, path)
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module = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(module)
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obj = inspect.getmembers(
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module,
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lambda x: inspect.isclass(x) and issubclass(x, parent_class) and
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x.__module__ == driver_name)
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error = None
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if len(obj) > 1:
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error = "multiple %s implementation" % parent_class
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if not obj:
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error = "no %s implementation found" % parent_class
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if error:
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Drivers.log.error("%s: %s" % (path, error))
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return False
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return obj[0][1]
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@staticmethod
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def load(drivers_paths=[]):
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"""Load drivers"""
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if drivers_paths == Drivers.drivers_paths:
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# Already loaded
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return
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Drivers.drivers.clear()
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for drivers_path in drivers_paths + [os.path.dirname(__file__)]:
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drivers = os.listdir(drivers_path)
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for driver in drivers:
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driver_path = os.path.join(drivers_path, driver)
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if driver in Drivers.drivers:
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Drivers.log.warning("%s: duplicate driver" % driver_path)
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continue
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if not os.path.isdir(driver_path) or \
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"__init__.py" not in os.listdir(driver_path):
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continue
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Drivers.log.debug("%s: loading driver" % driver_path)
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driver_obj = {}
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for name, parent_class in (
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("config", ProviderConfig),
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("handler", NodeRequestHandler),
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("provider", Provider),
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):
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driver_obj[name] = Drivers._load_class(
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driver, os.path.join(driver_path, "%s.py" % name),
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parent_class)
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if not driver_obj[name]:
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break
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if not driver_obj[name]:
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Drivers.log.error("%s: skipping incorrect driver" %
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driver_path)
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continue
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Drivers.drivers[driver] = driver_obj
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Drivers.drivers_paths = drivers_paths
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@staticmethod
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def get(name):
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if not Drivers.drivers:
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Drivers.load()
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try:
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return Drivers.drivers[name]
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except KeyError:
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raise RuntimeError("%s: unknown driver" % name)
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class Provider(object, metaclass=abc.ABCMeta):
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"""The Provider interface
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The class or instance attribute **name** must be provided as a string.
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"""
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@abc.abstractmethod
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def start(self):
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pass
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@abc.abstractmethod
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def stop(self):
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pass
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@abc.abstractmethod
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def join(self):
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pass
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@abc.abstractmethod
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def labelReady(self, name):
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pass
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@abc.abstractmethod
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def cleanupNode(self, node_id):
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pass
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@abc.abstractmethod
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def waitForNodeCleanup(self, node_id):
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pass
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@abc.abstractmethod
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def cleanupLeakedResources(self):
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pass
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@abc.abstractmethod
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def listNodes(self):
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pass
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class NodeRequestHandler(object, metaclass=abc.ABCMeta):
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'''
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Class to process a single nodeset request.
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The PoolWorker thread will instantiate a class of this type for each
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node request that it pulls from ZooKeeper.
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Subclasses are required to implement the launch method.
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'''
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def __init__(self, pw, request):
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'''
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:param PoolWorker pw: The parent PoolWorker object.
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:param NodeRequest request: The request to handle.
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'''
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self.pw = pw
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self.request = request
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self.nodeset = []
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self.done = False
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self.paused = False
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self.launcher_id = self.pw.launcher_id
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self._failed_nodes = []
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self._ready_nodes = []
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self._threads = []
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def _setFromPoolWorker(self):
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'''
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Set values that we pull from the parent PoolWorker.
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We don't do this in __init__ because this class is re-entrant and we
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want the updated values.
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'''
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self.provider = self.pw.getProviderConfig()
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self.pool = self.pw.getPoolConfig()
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self.zk = self.pw.getZK()
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self.manager = self.pw.getProviderManager()
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@property
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def alive_thread_count(self):
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count = 0
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for t in self._threads:
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if t.isAlive():
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count += 1
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return count
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@property
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def failed_nodes(self):
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return self._failed_nodes
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@property
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def ready_nodes(self):
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return self._ready_nodes
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def _imagesAvailable(self):
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'''
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Determines if the requested images are available for this provider.
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ZooKeeper is queried for an image uploaded to the provider that is
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in the READY state.
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:returns: True if it is available, False otherwise.
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'''
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if self.provider.manage_images:
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for label in self.request.node_types:
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if self.pool.labels[label].cloud_image:
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if not self.manager.labelReady(self.pool.labels[label]):
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return False
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else:
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if not self.zk.getMostRecentImageUpload(
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self.pool.labels[label].diskimage.name,
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self.provider.name):
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return False
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return True
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def _invalidNodeTypes(self):
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'''
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Return any node types that are invalid for this provider.
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:returns: A list of node type names that are invalid, or an empty
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list if all are valid.
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'''
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invalid = []
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for ntype in self.request.node_types:
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if ntype not in self.pool.labels:
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invalid.append(ntype)
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return invalid
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def _waitForNodeSet(self):
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'''
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Fill node set for the request.
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Obtain nodes for the request, pausing all new request handling for
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this provider until the node set can be filled.
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note:: This code is a bit racey in its calculation of the number of
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nodes in use for quota purposes. It is possible for multiple
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launchers to be doing this calculation at the same time. Since we
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currently have no locking mechanism around the "in use"
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calculation, if we are at the edge of the quota, one of the
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launchers could attempt to launch a new node after the other
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launcher has already started doing so. This would cause an
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expected failure from the underlying library, which is ok for now.
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'''
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# Since this code can be called more than once for the same request,
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# we need to calculate the difference between our current node set
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# and what was requested. We cannot use set operations here since a
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# node type can appear more than once in the requested types.
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saved_types = collections.Counter([n.type for n in self.nodeset])
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requested_types = collections.Counter(self.request.node_types)
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diff = requested_types - saved_types
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needed_types = list(diff.elements())
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ready_nodes = self.zk.getReadyNodesOfTypes(needed_types)
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for ntype in needed_types:
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# First try to grab from the list of already available nodes.
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got_a_node = False
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if self.request.reuse and ntype in ready_nodes:
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for node in ready_nodes[ntype]:
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# Only interested in nodes from this provider and pool
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if node.provider != self.provider.name:
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continue
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if node.pool != self.pool.name:
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continue
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# Check this driver reuse requirements
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if not self.checkReusableNode(node):
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continue
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try:
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self.zk.lockNode(node, blocking=False)
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except exceptions.ZKLockException:
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# It's already locked so skip it.
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continue
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else:
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if self.paused:
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self.log.debug("Unpaused request %s", self.request)
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self.paused = False
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self.log.debug(
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"Locked existing node %s for request %s",
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node.id, self.request.id)
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got_a_node = True
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node.allocated_to = self.request.id
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self.zk.storeNode(node)
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self.nodeset.append(node)
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# Notify driver handler about node re-use
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self.nodeReused(node)
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break
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# Could not grab an existing node, so launch a new one.
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if not got_a_node:
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# If we calculate that we're at capacity, pause until nodes
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# are released by Zuul and removed by the DeletedNodeWorker.
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if not self.hasRemainingQuota(ntype):
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if not self.paused:
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self.log.debug(
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"Pausing request handling to satisfy request %s",
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self.request)
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self.paused = True
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self.zk.deleteOldestUnusedNode(self.provider.name,
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self.pool.name)
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return
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if self.paused:
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self.log.debug("Unpaused request %s", self.request)
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self.paused = False
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node = zk.Node()
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node.state = zk.INIT
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node.type = ntype
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node.provider = self.provider.name
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node.pool = self.pool.name
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node.launcher = self.launcher_id
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node.allocated_to = self.request.id
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self.setNodeMetadata(node)
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# Note: It should be safe (i.e., no race) to lock the node
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# *after* it is stored since nodes in INIT state are not
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# locked anywhere.
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self.zk.storeNode(node)
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self.zk.lockNode(node, blocking=False)
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self.log.debug("Locked building node %s for request %s",
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node.id, self.request.id)
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# Set state AFTER lock so that it isn't accidentally cleaned
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# up (unlocked BUILDING nodes will be deleted).
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node.state = zk.BUILDING
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self.zk.storeNode(node)
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self.nodeset.append(node)
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thread = self.launch(node)
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if thread:
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thread.start()
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self._threads.append(thread)
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def _runHandler(self):
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'''
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Main body for the node request handling.
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'''
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self._setFromPoolWorker()
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if self.provider is None or self.pool is None:
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# If the config changed out from underneath us, we could now be
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# an invalid provider and should stop handling this request.
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raise Exception("Provider configuration missing")
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# We have the launcher_id attr after _setFromPoolWorker() is called.
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self.log = logging.getLogger(
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"nodepool.driver.NodeRequestHandler[%s]" % self.launcher_id)
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declined_reasons = []
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invalid_types = self._invalidNodeTypes()
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if invalid_types:
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declined_reasons.append('node type(s) [%s] not available' %
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','.join(invalid_types))
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elif not self._imagesAvailable():
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declined_reasons.append('images are not available')
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elif (self.pool.max_servers <= 0 or
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not self.hasProviderQuota(self.request.node_types)):
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declined_reasons.append('it would exceed quota')
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# TODO(tobiash): Maybe also calculate the quota prediction here and
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# backoff for some seconds if the used quota would be exceeded?
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# This way we could give another (free) provider the chance to take
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# this request earlier.
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# For min-ready requests, which do not re-use READY nodes, let's
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# decline if this provider is already at capacity. Otherwise, we
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# could end up wedged until another request frees up a node.
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if self.pool.max_servers is not None and \
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self.request.requestor == "NodePool:min-ready":
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current_count = self.zk.countPoolNodes(self.provider.name,
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self.pool.name)
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# Use >= because dynamic config changes to max-servers can leave
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# us with more than max-servers.
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# TODO: handle this with the quota code
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if current_count >= self.pool.max_servers:
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declined_reasons.append("provider cannot satisify min-ready")
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if declined_reasons:
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self.log.debug("Declining node request %s because %s",
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self.request.id, ', '.join(declined_reasons))
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self.decline_request()
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self.unlockNodeSet(clear_allocation=True)
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# If conditions have changed for a paused request to now cause us
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# to decline it, we need to unpause so we don't keep trying it
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if self.paused:
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self.paused = False
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self.zk.storeNodeRequest(self.request)
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self.zk.unlockNodeRequest(self.request)
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self.done = True
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return
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if self.paused:
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self.log.debug("Retrying node request %s", self.request.id)
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else:
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self.log.debug("Accepting node request %s", self.request.id)
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self.request.state = zk.PENDING
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self.zk.storeNodeRequest(self.request)
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self._waitForNodeSet()
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# ---------------------------------------------------------------
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# Public methods
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# ---------------------------------------------------------------
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def unlockNodeSet(self, clear_allocation=False):
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'''
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Attempt unlocking all Nodes in the node set.
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:param bool clear_allocation: If true, clears the node allocated_to
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attribute.
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'''
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for node in self.nodeset:
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if not node.lock:
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continue
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if clear_allocation:
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node.allocated_to = None
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self.zk.storeNode(node)
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try:
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self.zk.unlockNode(node)
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except Exception:
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self.log.exception("Error unlocking node:")
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self.log.debug("Unlocked node %s for request %s",
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node.id, self.request.id)
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self.nodeset = []
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def decline_request(self):
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# Technically, this check to see if we've already declined it should
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# not be necessary. But if there is a bug (and there has been), we
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# want to make sure we don't continuously grow this array.
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if self.launcher_id not in self.request.declined_by:
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self.request.declined_by.append(self.launcher_id)
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launchers = set([x.id for x in self.zk.getRegisteredLaunchers()])
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if launchers.issubset(set(self.request.declined_by)):
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# All launchers have declined it
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self.log.debug("Failing declined node request %s",
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self.request.id)
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self.request.state = zk.FAILED
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else:
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self.request.state = zk.REQUESTED
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def run(self):
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'''
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Execute node request handling.
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This code is designed to be re-entrant. Because we can't always
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satisfy a request immediately (due to lack of provider resources), we
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need to be able to call run() repeatedly until the request can be
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fulfilled. The node set is saved and added to between calls.
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'''
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try:
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self._runHandler()
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except Exception:
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self.log.exception(
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"Declining node request %s due to exception in "
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"NodeRequestHandler:", self.request.id)
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self.decline_request()
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self.unlockNodeSet(clear_allocation=True)
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try:
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self.zk.storeNodeRequest(self.request)
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self.zk.unlockNodeRequest(self.request)
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except Exception:
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# If the request is gone for some reason, we need to make
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# sure that self.done still gets set.
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self.log.exception("Unable to decline missing request %s",
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self.request.id)
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self.done = True
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def poll(self):
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'''
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Check if the request has been handled.
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Once the request has been handled, the 'nodeset' attribute will be
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filled with the list of nodes assigned to the request, or it will be
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empty if the request could not be fulfilled.
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:returns: True if we are done with the request, False otherwise.
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'''
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if self.paused:
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return False
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if self.done:
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return True
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if not self.pollLauncher():
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return False
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# If the request has been pulled, unallocate the node set so other
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# requests can use them.
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if not self.zk.getNodeRequest(self.request.id):
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self.log.info("Node request %s disappeared", self.request.id)
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for node in self.nodeset:
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node.allocated_to = None
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self.zk.storeNode(node)
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self.unlockNodeSet()
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try:
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self.zk.unlockNodeRequest(self.request)
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except exceptions.ZKLockException:
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# If the lock object is invalid that is "ok" since we no
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# longer have a request either. Just do our best, log and
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# move on.
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self.log.debug("Request lock invalid for node request %s "
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"when attempting to clean up the lock",
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self.request.id)
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return True
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if self.failed_nodes:
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self.log.debug("Declining node request %s because nodes failed",
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self.request.id)
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self.decline_request()
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else:
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# The assigned nodes must be added to the request in the order
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# in which they were requested.
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assigned = []
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for requested_type in self.request.node_types:
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for node in self.nodeset:
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if node.id in assigned:
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continue
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if node.type == requested_type:
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# Record node ID in the request
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self.request.nodes.append(node.id)
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assigned.append(node.id)
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self.log.debug("Fulfilled node request %s",
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self.request.id)
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self.request.state = zk.FULFILLED
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self.unlockNodeSet()
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self.zk.storeNodeRequest(self.request)
|
|
self.zk.unlockNodeRequest(self.request)
|
|
return True
|
|
|
|
# ---------------------------------------------------------------
|
|
# Driver Implementation
|
|
# ---------------------------------------------------------------
|
|
def pollLauncher(self):
|
|
'''
|
|
Check if all launch requests have completed.
|
|
|
|
When all of the Node objects have reached a final state (READY or
|
|
FAILED), we'll know all threads have finished the launch process.
|
|
'''
|
|
if not self._threads:
|
|
return True
|
|
|
|
# Give the NodeLaunch threads time to finish.
|
|
if self.alive_thread_count:
|
|
return False
|
|
|
|
node_states = [node.state for node in self.nodeset]
|
|
|
|
# NOTE: It very important that NodeLauncher always sets one of
|
|
# these states, no matter what.
|
|
if not all(s in (zk.READY, zk.FAILED) for s in node_states):
|
|
return False
|
|
|
|
for node in self.nodeset:
|
|
if node.state == zk.READY:
|
|
self._ready_nodes.append(node)
|
|
else:
|
|
self._failed_nodes.append(node)
|
|
|
|
return True
|
|
|
|
def hasProviderQuota(self, node_types):
|
|
'''
|
|
Checks if a provider has enough quota to handle a list of nodes.
|
|
This does not take our currently existing nodes into account.
|
|
|
|
:param node_types: list of node types to check
|
|
:return: True if the node list fits into the provider, False otherwise
|
|
'''
|
|
return True
|
|
|
|
def hasRemainingQuota(self, ntype):
|
|
'''
|
|
Checks if the predicted quota is enough for an additional node of type
|
|
ntype.
|
|
|
|
:param ntype: node type for the quota check
|
|
:return: True if there is enough quota, False otherwise
|
|
'''
|
|
return True
|
|
|
|
def nodeReused(self, node):
|
|
'''
|
|
Handler may implement this to be notified when a node is re-used.
|
|
The OpenStack handler uses this to set the choozen_az.
|
|
'''
|
|
pass
|
|
|
|
def checkReusableNode(self, node):
|
|
'''
|
|
Handler may implement this to verify a node can be re-used.
|
|
The OpenStack handler uses this to verify the node az is correct.
|
|
'''
|
|
return True
|
|
|
|
def setNodeMetadata(self, node):
|
|
'''
|
|
Handler may implement this to store metadata before building the node.
|
|
The OpenStack handler uses this to set az, cloud and region.
|
|
'''
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def launch(self, node):
|
|
'''
|
|
Handler needs to implement this to launch the node.
|
|
'''
|
|
pass
|
|
|
|
|
|
class NodeLauncher(threading.Thread, stats.StatsReporter):
|
|
'''
|
|
Class to launch a single node.
|
|
|
|
The NodeRequestHandler may return such object to manage asynchronous
|
|
node creation.
|
|
|
|
Subclasses are required to implement the launch method
|
|
'''
|
|
|
|
def __init__(self, handler, node):
|
|
threading.Thread.__init__(self, name="NodeLauncher-%s" % node.id)
|
|
stats.StatsReporter.__init__(self)
|
|
self.log = logging.getLogger("nodepool.NodeLauncher-%s" % node.id)
|
|
self.handler = handler
|
|
self.node = node
|
|
self.label = handler.pool.labels[node.type]
|
|
self.pool = self.label.pool
|
|
self.provider_config = self.pool.provider
|
|
|
|
def storeNode(self):
|
|
"""Store the node state in Zookeeper"""
|
|
self.handler.zk.storeNode(self.node)
|
|
|
|
def run(self):
|
|
start_time = time.monotonic()
|
|
statsd_key = 'ready'
|
|
|
|
try:
|
|
self.launch()
|
|
except kze.SessionExpiredError:
|
|
# Our node lock is gone, leaving the node state as BUILDING.
|
|
# This will get cleaned up in ZooKeeper automatically, but we
|
|
# must still set our cached node state to FAILED for the
|
|
# NodeLaunchManager's poll() method.
|
|
self.log.error(
|
|
"Lost ZooKeeper session trying to launch for node %s",
|
|
self.node.id)
|
|
self.node.state = zk.FAILED
|
|
statsd_key = 'error.zksession'
|
|
except Exception as e:
|
|
self.log.exception("Launch failed for node %s:",
|
|
self.node.id)
|
|
self.node.state = zk.FAILED
|
|
self.handler.zk.storeNode(self.node)
|
|
|
|
if hasattr(e, 'statsd_key'):
|
|
statsd_key = e.statsd_key
|
|
else:
|
|
statsd_key = 'error.unknown'
|
|
|
|
try:
|
|
dt = int((time.monotonic() - start_time) * 1000)
|
|
self.recordLaunchStats(statsd_key, dt)
|
|
self.updateNodeStats(self.handler.zk, self.provider_config)
|
|
except Exception:
|
|
self.log.exception("Exception while reporting stats:")
|
|
|
|
|
|
class ConfigValue(object):
|
|
def __eq__(self, other):
|
|
if isinstance(other, ConfigValue):
|
|
if other.__dict__ == self.__dict__:
|
|
return True
|
|
return False
|
|
|
|
def __ne__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
|
|
class ConfigPool(ConfigValue):
|
|
def __init__(self):
|
|
self.labels = []
|
|
self.max_servers = math.inf
|
|
|
|
|
|
class Driver(ConfigValue):
|
|
pass
|
|
|
|
|
|
class ProviderConfig(ConfigValue, metaclass=abc.ABCMeta):
|
|
"""The Provider config interface
|
|
|
|
The class or instance attribute **name** must be provided as a string.
|
|
|
|
"""
|
|
def __init__(self, provider):
|
|
self.name = provider['name']
|
|
self.provider = provider
|
|
self.driver = Driver()
|
|
self.driver.name = provider.get('driver', 'openstack')
|
|
self.max_concurrency = provider.get('max-concurrency', -1)
|
|
|
|
def __repr__(self):
|
|
return "<Provider %s>" % self.name
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def pools(self):
|
|
'''
|
|
Return a dict of ConfigPool-based objects, indexed by pool name.
|
|
'''
|
|
pass
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def manage_images(self):
|
|
'''
|
|
Return True if provider manages external images, False otherwise.
|
|
'''
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def __eq__(self, other):
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def reset():
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def load(self, newconfig):
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def getSchema(self):
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def getSupportedLabels(self):
|
|
'''
|
|
Return a set of label names supported by this provider.
|
|
'''
|
|
pass
|