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64 lines
2.0 KiB
Go
64 lines
2.0 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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 rootcoord
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import (
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"context"
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"fmt"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/pkg/log"
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)
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type baseUndoTask struct {
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todoStep []nestedStep // steps to execute
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undoStep []nestedStep // steps to undo
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stepExecutor StepExecutor
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}
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func newBaseUndoTask(stepExecutor StepExecutor) *baseUndoTask {
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return &baseUndoTask{
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todoStep: make([]nestedStep, 0),
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undoStep: make([]nestedStep, 0),
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stepExecutor: stepExecutor,
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}
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}
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func (b *baseUndoTask) AddStep(todoStep, undoStep nestedStep) {
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b.todoStep = append(b.todoStep, todoStep)
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b.undoStep = append(b.undoStep, undoStep)
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}
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func (b *baseUndoTask) Execute(ctx context.Context) error {
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if len(b.todoStep) != len(b.undoStep) {
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return fmt.Errorf("todo step and undo step length not equal")
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}
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for i := 0; i < len(b.todoStep); i++ {
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todoStep := b.todoStep[i]
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// no children step in normal case.
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if _, err := todoStep.Execute(ctx); err != nil {
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log.Warn("failed to execute step, trying to undo", zap.Error(err), zap.String("desc", todoStep.Desc()))
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undoSteps := b.undoStep[:i]
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b.undoStep = nil // let baseUndoTask can be collected.
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go b.stepExecutor.AddSteps(&stepStack{undoSteps})
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return err
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}
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}
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return nil
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}
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