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Only Delete LoadBalancerMachine after a grace period (#267)
* WIP * fix setCondition * Add more tests than is probably needed * unfocus * iterate over required conditions first * configure yawollet exponential backoff * feedbackc omments * rewrite condition helper to mimic apimachinery/meta * cap and document yawollet backoff * final PR feedback * cleanup * Build images on all branches * Use status subresource client where necessary * Bump chart version in preparation for release * Deflake test --------- Co-authored-by: Tim Ebert <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| package loadbalancerset | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| yawolv1beta1 "github.com/stackitcloud/yawol/api/v1beta1" | ||
| "github.com/stackitcloud/yawol/internal/helper" | ||
| corev1 "k8s.io/api/core/v1" | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| ) | ||
|
|
||
| var relevantLBMConditionslForLBS = []helper.LoadbalancerCondition{ | ||
| helper.ConfigReady, | ||
| helper.EnvoyReady, | ||
| helper.EnvoyUpToDate, | ||
| } | ||
|
|
||
| // areRelevantConditionsMet checks if all required conditions (from the | ||
| // perspective of the LoadBalancerSet) are both `True` and up-to-date, according | ||
| // to the passed expiration time. If `stableConditions` is set, a condition is | ||
| // only considered `False` if it has been in that state since the expiration | ||
| // time. | ||
| func areRelevantConditionsMet( | ||
| machine *yawolv1beta1.LoadBalancerMachine, | ||
| expiration metav1.Time, | ||
| stableConditions bool, | ||
| ) (ok bool, reason string) { | ||
| if machine.Status.Conditions == nil { | ||
| return false, "no conditions set" | ||
| } | ||
|
|
||
| // constuct lookup map | ||
| conditions := *machine.Status.Conditions | ||
| condMap := make(map[helper.LoadbalancerCondition]corev1.NodeCondition, len(conditions)) | ||
| for i := range conditions { | ||
| condMap[helper.LoadbalancerCondition(conditions[i].Type)] = conditions[i] | ||
| } | ||
|
|
||
| for _, typ := range relevantLBMConditionslForLBS { | ||
| condition, found := condMap[typ] | ||
| if !found { | ||
| return false, fmt.Sprintf("required condition %s not present on machine", typ) | ||
| } | ||
|
|
||
| conditionIsStable := true | ||
| if stableConditions { | ||
| conditionIsStable = condition.LastTransitionTime.Before(&expiration) | ||
| } | ||
| if conditionIsStable && condition.Status != corev1.ConditionTrue { | ||
| return false, fmt.Sprintf( | ||
| "condition %s is in status %s with reason: %v, message: %v, lastTransitionTime: %v", | ||
| condition.Type, condition.Status, condition.Reason, condition.Message, condition.LastTransitionTime, | ||
| ) | ||
| } | ||
| if condition.LastHeartbeatTime.Before(&expiration) { | ||
| return false, fmt.Sprintf("condition %s heartbeat is stale", condition.Type) | ||
| } | ||
| } | ||
|
|
||
| return true, "" | ||
| } | ||
|
|
||
| func findDeletionCondition(machine *yawolv1beta1.LoadBalancerMachine) *corev1.NodeCondition { | ||
| if machine.Status.Conditions == nil { | ||
| return nil | ||
| } | ||
| conditions := *machine.Status.Conditions | ||
| for i := range conditions { | ||
| if conditions[i].Type == helper.DeletionMarkerCondition { | ||
| return &conditions[i] | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func setDeletionCondition(machine *yawolv1beta1.LoadBalancerMachine, newCondition corev1.NodeCondition) { | ||
| if machine.Status.Conditions == nil { | ||
| machine.Status.Conditions = &[]corev1.NodeCondition{} | ||
| } | ||
|
|
||
| newCondition.Type = helper.DeletionMarkerCondition | ||
|
|
||
| existingCondition := findDeletionCondition(machine) | ||
| if existingCondition == nil { | ||
| if newCondition.LastTransitionTime.IsZero() { | ||
| newCondition.LastTransitionTime = metav1.Now() | ||
| } | ||
| *machine.Status.Conditions = append(*machine.Status.Conditions, newCondition) | ||
| return | ||
| } | ||
|
|
||
| if existingCondition.Status != newCondition.Status { | ||
| existingCondition.Status = newCondition.Status | ||
| if !newCondition.LastTransitionTime.IsZero() { | ||
| existingCondition.LastTransitionTime = newCondition.LastTransitionTime | ||
| } else { | ||
| existingCondition.LastTransitionTime = metav1.Now() | ||
| } | ||
| } | ||
|
|
||
| existingCondition.Reason = newCondition.Reason | ||
| existingCondition.Message = newCondition.Message | ||
| existingCondition.LastHeartbeatTime = newCondition.LastHeartbeatTime | ||
| } | ||
|
|
||
| func removeDeletionCondition(machine *yawolv1beta1.LoadBalancerMachine) { | ||
| if machine.Status.Conditions == nil || len(*machine.Status.Conditions) == 0 { | ||
| return | ||
| } | ||
| newConditions := make([]corev1.NodeCondition, 0, len(*machine.Status.Conditions)-1) | ||
| for _, condition := range *machine.Status.Conditions { | ||
| if condition.Type != helper.DeletionMarkerCondition { | ||
| newConditions = append(newConditions, condition) | ||
| } | ||
| } | ||
|
|
||
| *machine.Status.Conditions = newConditions | ||
| } |
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