117 lines
2.7 KiB
Go
117 lines
2.7 KiB
Go
/*
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Copyright 2021 Alibaba Group Holding Limited.
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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 control
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import (
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"fmt"
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"github.com/go-logr/logr"
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"sigs.k8s.io/controller-runtime/pkg/reconcile"
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)
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type ConditionFunc func(rc ReconcileContext, log logr.Logger) (bool, error)
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type Condition interface {
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Name() string
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Evaluate(rc ReconcileContext, log logr.Logger) (bool, error)
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}
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type stepIf struct {
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cond Condition
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step Step
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}
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func (s *stepIf) Name() string {
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return fmt.Sprintf("StepIf-" + s.cond.Name() + "-" + s.step.Name())
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}
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func (s *stepIf) Execute(rc ReconcileContext, flow Flow) (reconcile.Result, error) {
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return s.executeIf(rc, flow, s.cond)
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}
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func (s *stepIf) executeIf(rc ReconcileContext, flow Flow, cond Condition) (reconcile.Result, error) {
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condVal, err := cond.Evaluate(rc, flow.Logger())
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if err != nil {
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return flow.Error(err, "Evaluate condition failed.")
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}
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if condVal {
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flow.Logger().Info("Condition matches.", "step-if", s.step.Name())
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return s.step.Execute(rc, flow.WithLoggerValues("step-if", s.step.Name()))
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} else {
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return flow.Pass()
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}
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}
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func NewStepIf(cond Condition, step Step) Step {
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return &stepIf{
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cond: cond,
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step: step,
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}
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}
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func NewStepIfBinder(cond Condition, step Step) BindFunc {
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return NewStepBinder(NewStepIf(cond, step))
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}
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type cond struct {
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name string
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f ConditionFunc
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}
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func (c *cond) Name() string {
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return c.name
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}
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func (c *cond) Evaluate(rc ReconcileContext, log logr.Logger) (bool, error) {
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return c.f(rc, log)
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}
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func NewCondition(name string, f ConditionFunc) Condition {
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return &cond{name: name, f: f}
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}
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type cachedCond struct {
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cond Condition
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result *bool
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}
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func (c *cachedCond) Name() string {
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return c.cond.Name()
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}
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func (c *cachedCond) Evaluate(rc ReconcileContext, log logr.Logger) (bool, error) {
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if c.result != nil {
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return *c.result, nil
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}
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result, err := c.cond.Evaluate(rc, log)
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c.result = &result
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return result, err
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}
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// NewCachedCondition returns a condition which evaluates only once and
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// caches the result. Note the error will be returned only when the first time
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// the Evaluate method is invoked. Any sequential calls return the result
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// with a nil error.
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func NewCachedCondition(cond Condition) Condition {
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return &cachedCond{
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cond: cond,
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result: nil,
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}
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}
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