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statemachine.go
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statemachine.go
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/*
Copyright 2023 The Rook Authors. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package multus
import (
"context"
"fmt"
"time"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type validationState interface {
Run(ctx context.Context, vsm *validationStateMachine) (suggestions []string, err error)
}
type validationStateMachine struct {
vt *ValidationTest
state validationState
timer *time.Timer
stateWasChanged bool
resourceOwnerRefs []meta.OwnerReference
testResults *ValidationTestResults
lastSuggestions []string
lastErr error
done bool
}
func (vsm *validationStateMachine) SetNextState(nextState validationState) {
vsm.stateWasChanged = true
vsm.state = nextState
}
func (vsm *validationStateMachine) Exit() {
vsm.done = true
}
func (vsm *validationStateMachine) Run(ctx context.Context) (*ValidationTestResults, error) {
vsm.timer = time.NewTimer(vsm.vt.ResourceTimeout)
defer func() { vsm.timer.Stop() }()
for {
select {
case <-ctx.Done():
return vsm.exitContextCanceled(ctx)
case <-vsm.timer.C:
vsm.testResults.addSuggestions(vsm.lastSuggestions...)
return vsm.testResults, fmt.Errorf("multus validation test timed out: %w", vsm.lastErr)
default:
// give each state the full resource timeout to run successfully
if vsm.stateWasChanged {
vsm.resetTimer()
vsm.stateWasChanged = false
}
// run the state
suggestions, err := vsm.state.Run(ctx, vsm)
// if the context was canceled, the error message won't be as useful as gathered from
// the last context, so exit before updating the latest suggestions and error
if ctx.Err() != nil {
return vsm.exitContextCanceled(ctx)
}
// record the latest suggestions and error
vsm.lastErr = err
vsm.lastSuggestions = suggestions
// exit the state machine, error or not
if vsm.done {
vsm.testResults.addSuggestions(vsm.lastSuggestions...)
if vsm.lastErr != nil {
return vsm.testResults, fmt.Errorf("multus validation test failed: %w", vsm.lastErr)
}
return vsm.testResults, nil
}
if err != nil {
vsm.vt.Logger.Infof("continuing: %s", err)
}
time.Sleep(2 * time.Second)
}
}
}
func (vsm *validationStateMachine) resetTimer() {
if !vsm.timer.Stop() {
<-vsm.timer.C
}
vsm.timer.Reset(vsm.vt.ResourceTimeout)
}
func (vsm *validationStateMachine) exitContextCanceled(ctx context.Context) (*ValidationTestResults, error) {
vsm.testResults.addSuggestions(vsm.lastSuggestions...)
return vsm.testResults, fmt.Errorf("context canceled before multus validation test could complete: %s: %w", ctx.Err().Error(), vsm.lastErr)
}