71 lines
3.1 KiB
Go
71 lines
3.1 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 implied.
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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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*/
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package store
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import (
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"fmt"
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"time"
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kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
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"k8s.io/kubernetes/pkg/kubelet/kubeletconfig/checkpoint"
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)
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// Store saves checkpoints and information about which is the assigned and last-known-good checkpoint to a storage layer
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type Store interface {
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// Initialize sets up the storage layer
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Initialize() error
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// Exists returns true if the object referenced by `source` has been checkpointed.
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// The source must be unambiguous - e.g. if referencing an API object it must specify both uid and resourceVersion.
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Exists(source checkpoint.RemoteConfigSource) (bool, error)
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// Save Kubelet config payloads to the storage layer. It must be possible to unmarshal the payload to a KubeletConfiguration.
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// The following payload types are supported:
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// - k8s.io/api/core/v1.ConfigMap
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Save(c checkpoint.Payload) error
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// Load loads the KubeletConfiguration from the checkpoint referenced by `source`.
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Load(source checkpoint.RemoteConfigSource) (*kubeletconfig.KubeletConfiguration, error)
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// AssignedModified returns the last time that the assigned checkpoint was set
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AssignedModified() (time.Time, error)
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// Assigned returns the source that points to the checkpoint currently assigned to the Kubelet, or nil if no assigned checkpoint is set
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Assigned() (checkpoint.RemoteConfigSource, error)
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// LastKnownGood returns the source that points to the last-known-good checkpoint, or nil if no last-known-good checkpoint is set
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LastKnownGood() (checkpoint.RemoteConfigSource, error)
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// SetAssigned saves the source that points to the assigned checkpoint, set to nil to unset
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SetAssigned(source checkpoint.RemoteConfigSource) error
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// SetLastKnownGood saves the source that points to the last-known-good checkpoint, set to nil to unset
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SetLastKnownGood(source checkpoint.RemoteConfigSource) error
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// Reset unsets the assigned and last-known-good checkpoints and returns whether the assigned checkpoint was unset as a result of the reset
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Reset() (bool, error)
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}
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// reset is a helper for implementing Reset, which can be implemented in terms of Store methods
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func reset(s Store) (bool, error) {
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assigned, err := s.Assigned()
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if err != nil {
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return false, err
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}
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if err := s.SetLastKnownGood(nil); err != nil {
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return false, fmt.Errorf("failed to reset last-known-good UID in checkpoint store, error: %v", err)
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}
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if err := s.SetAssigned(nil); err != nil {
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return false, fmt.Errorf("failed to reset assigned UID in checkpoint store, error: %v", err)
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}
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return assigned != nil, nil
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}
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