mirror of
https://github.com/etcd-io/etcd.git
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3de5e221a8
Returning nil means that raft.Trigger was not called, causing member to wait infinitly for response for response on raft request.
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Copyright 2021 The etcd Authors
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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 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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package version
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import (
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"context"
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"github.com/coreos/go-semver/semver"
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"go.uber.org/zap"
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)
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// Manager contains logic to manage etcd cluster version downgrade process.
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type Manager struct {
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lg *zap.Logger
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s Server
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}
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// NewManager returns a new manager instance
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func NewManager(lg *zap.Logger, s Server) *Manager {
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return &Manager{
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lg: lg,
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s: s,
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}
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}
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// DowngradeValidate validates if cluster is downloadable to provided target version and returns error if not.
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func (m *Manager) DowngradeValidate(ctx context.Context, targetVersion *semver.Version) error {
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// gets leaders commit index and wait for local store to finish applying that index
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// to avoid using stale downgrade information
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err := m.s.LinearizableReadNotify(ctx)
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if err != nil {
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return err
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}
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cv := m.s.GetClusterVersion()
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allowedTargetVersion := allowedDowngradeVersion(cv)
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if !targetVersion.Equal(*allowedTargetVersion) {
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return ErrInvalidDowngradeTargetVersion
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}
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downgradeInfo := m.s.GetDowngradeInfo()
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if downgradeInfo != nil && downgradeInfo.Enabled {
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// Todo: return the downgrade status along with the error msg
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return ErrDowngradeInProcess
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}
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return nil
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}
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// DowngradeEnable initiates etcd cluster version downgrade process.
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func (m *Manager) DowngradeEnable(ctx context.Context, targetVersion *semver.Version) error {
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// validate downgrade capability before starting downgrade
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err := m.DowngradeValidate(ctx, targetVersion)
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if err != nil {
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return err
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}
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return m.s.DowngradeEnable(ctx, targetVersion)
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}
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// DowngradeCancel cancels ongoing downgrade process.
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func (m *Manager) DowngradeCancel(ctx context.Context) error {
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err := m.s.LinearizableReadNotify(ctx)
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if err != nil {
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return err
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}
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downgradeInfo := m.s.GetDowngradeInfo()
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if !downgradeInfo.Enabled {
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return ErrNoInflightDowngrade
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}
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return m.s.DowngradeCancel(ctx)
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}
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