refactored large func

pkg/es/ilm_forecast.go

@@ -35,6 +35,7 @@ import (
 
 var (
 	matchDuration = regexp.MustCompile(`(\d+)([dhms])`)
+	IlmPhaseOrder = []string{"hot", "warm", "cold", "frozen", "delete"}
 )
 
 type NextPhase struct {
@@ -161,6 +162,7 @@ func virtualAge(phase *PhaseData) time.Duration {
 	return time.Duration(virtualAge) * time.Second
 }
 
+// Retrieve all index, ilm-explain and ilm-policies in parallel
 func getIlmPhaseData(conf *cfg.Config) ([]PhaseData, error) {
 	responses := make(chan apiResponse, 3)
 	wg := &sync.WaitGroup{}
@@ -254,10 +256,7 @@ func getIlmPhaseData(conf *cfg.Config) ([]PhaseData, error) {
 	return list, nil
 }
 
-func findNextPhase(policy types.IlmPolicy, currentPhase string) *NextPhase {
-	// phase list to determine which comes next
-	order := []string{"hot", "warm", "cold", "frozen", "delete"}
-
+func registerPhases(policy types.IlmPolicy, currentPhase string) (map[string]*types.Phase, int) {
 	// register phases configured in the policy
 	phases := map[string]*types.Phase{
 		"hot":    nil,
@@ -271,7 +270,7 @@ func findNextPhase(policy types.IlmPolicy, currentPhase string) *NextPhase {
 	start := 0
 
 	// register phases
-	for idx, phase := range order {
+	for idx, phase := range IlmPhaseOrder {
 		switch phase {
 		case "hot":
 			if policy.Phases.Hot != nil {
@@ -304,11 +303,18 @@ func findNextPhase(policy types.IlmPolicy, currentPhase string) *NextPhase {
 		}
 	}
 
+	return phases, start
+}
+
+func findNextPhase(policy types.IlmPolicy, currentPhase string) *NextPhase {
+	// phase list to determine which comes next
+	phases, start := registerPhases(policy, currentPhase)
+
 	nextPhase := &NextPhase{}
 
 	// finally determine which phase comes next
 	// exception: hot, where we look for rollover rules
-	for idx, phase := range order {
+	for idx, phase := range IlmPhaseOrder {
 		if idx < start {
 			continue
 		}