[skip ci]Fix golint warnings in funcutil (#9235)

Signed-off-by: Xiangyu Wang <xiangyu.wang@zilliz.com>

internal/util/funcutil/func.go

@@ -102,12 +102,12 @@ func WaitForComponentInitOrHealthy(ctx context.Context, service types.Component,
 	return WaitForComponentStates(ctx, service, serviceName, []internalpb.StateCode{internalpb.StateCode_Initializing, internalpb.StateCode_Healthy}, attempts, sleep)
 }
 
-// WaitForComponentInitOrHealthy wait for component's state to be initializing
+// WaitForComponentInit wait for component's state to be initializing
 func WaitForComponentInit(ctx context.Context, service types.Component, serviceName string, attempts uint, sleep time.Duration) error {
 	return WaitForComponentStates(ctx, service, serviceName, []internalpb.StateCode{internalpb.StateCode_Initializing}, attempts, sleep)
 }
 
-// WaitForComponentInitOrHealthy wait for component's state to be healthy
+// WaitForComponentHealthy wait for component's state to be healthy
 func WaitForComponentHealthy(ctx context.Context, service types.Component, serviceName string, attempts uint, sleep time.Duration) error {
 	return WaitForComponentStates(ctx, service, serviceName, []internalpb.StateCode{internalpb.StateCode_Healthy}, attempts, sleep)
 }
@@ -128,6 +128,7 @@ func ParseIndexParamsMap(mStr string) (map[string]string, error) {
 }
 
 const (
+	// PulsarMaxMessageSizeKey is the key of config item
 	PulsarMaxMessageSizeKey = "maxMessageSize"
 )
 

internal/util/funcutil/parallel.go

@@ -20,12 +20,13 @@ import (
 	"go.uber.org/zap"
 )
 
+// GetFunctionName returns the name of input
 func GetFunctionName(i interface{}) string {
 	return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
 }
 
-// Reference: https://stackoverflow.com/questions/40809504/idiomatic-goroutine-termination-and-error-handling
 // ProcessFuncParallel process function in parallel.
+// Reference: https://stackoverflow.com/questions/40809504/idiomatic-goroutine-termination-and-error-handling
 func ProcessFuncParallel(total, maxParallel int, f func(idx int) error, fname string) error {
 	if maxParallel <= 0 {
 		maxParallel = 1

internal/util/funcutil/random.go

@@ -17,18 +17,19 @@ import (
 	"time"
 )
 
-var Rand *rand.Rand = nil
+var r *rand.Rand = nil
 
 func init() {
-	Rand = rand.New(rand.NewSource(time.Now().UnixNano()))
+	r = rand.New(rand.NewSource(time.Now().UnixNano()))
 }
 
 var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 
+// RandomString returns a batch of random string
 func RandomString(n int) string {
 	b := make([]rune, n)
 	for i := range b {
-		b[i] = letterRunes[Rand.Intn(len(letterRunes))]
+		b[i] = letterRunes[r.Intn(len(letterRunes))]
 	}
 	return string(b)
 }

internal/util/funcutil/slice.go

@@ -29,6 +29,7 @@ func SliceContain(s interface{}, item interface{}) bool {
 	return false
 }
 
+// SliceSetEqual is used to compare two Slice
 func SliceSetEqual(s1 interface{}, s2 interface{}) bool {
 	ss1 := reflect.ValueOf(s1)
 	ss2 := reflect.ValueOf(s2)
@@ -49,6 +50,7 @@ func SliceSetEqual(s1 interface{}, s2 interface{}) bool {
 	return true
 }
 
+// SortedSliceEqual is used to compare two Sorted Slice
 func SortedSliceEqual(s1 interface{}, s2 interface{}) bool {
 	ss1 := reflect.ValueOf(s1)
 	ss2 := reflect.ValueOf(s2)