change to use native sync.Pool

for #98

validator.go

@@ -37,46 +37,16 @@ const (
 	mapIndexFieldName   = "%s[%v]"
 )
 
-var structPool *pool
+var structPool *sync.Pool
 
-// Pool holds a channelStructErrors.
-type pool struct {
-	pool chan *StructErrors
-}
-
-// NewPool creates a new pool of Clients.
-func newPool(max int) *pool {
-	return &pool{
-		pool: make(chan *StructErrors, max),
-	}
-}
-
-// Borrow a StructErrors from the pool.
-func (p *pool) Borrow() *StructErrors {
-	var c *StructErrors
-
-	select {
-	case c = <-p.pool:
-	default:
-		c = &StructErrors{
+// returns new *StructErrors to the pool
+func newStructErrors() interface{} {
+	return &StructErrors{
 		Errors:       map[string]*FieldError{},
 		StructErrors: map[string]*StructErrors{},
 	}
 }
 
-	return c
-}
-
-// Return returns a StructErrors to the pool.
-func (p *pool) Return(c *StructErrors) {
-
-	select {
-	case p.pool <- c:
-	default:
-		// let it go, let it go...
-	}
-}
-
 type cachedTags struct {
 	keyVals [][]string
 	isOrVal bool
@@ -357,7 +327,7 @@ type Validate struct {
 // New creates a new Validate instance for use.
 func New(tagName string, funcs map[string]Func) *Validate {
 
-	structPool = newPool(10)
+	structPool = &sync.Pool{New: newStructErrors}
 
 	return &Validate{
 		tagName:         tagName,
@@ -377,9 +347,8 @@ func (v *Validate) SetTag(tagName string) {
 // nearly all cases. only increase if you have a deeply nested struct structure.
 // NOTE: this method is not thread-safe
 // NOTE: this is only here to keep compatibility with v5, in v6 the method will be removed
-// and the max pool size will be passed into the New function
 func (v *Validate) SetMaxStructPoolSize(max int) {
-	structPool = newPool(max)
+	structPool = &sync.Pool{New: newStructErrors}
 }
 
 // AddFunction adds a validation Func to a Validate's map of validators denoted by the key
@@ -440,7 +409,7 @@ func (v *Validate) structRecursive(top interface{}, current interface{}, s inter
 		cs = &cachedStruct{name: structName, children: numFields}
 	}
 
-	validationErrors := structPool.Borrow()
+	validationErrors := structPool.Get().(*StructErrors)
 	validationErrors.Struct = structName
 
 	for i := 0; i < numFields; i++ {
@@ -617,7 +586,7 @@ func (v *Validate) structRecursive(top interface{}, current interface{}, s inter
 	structCache.Set(structType, cs)
 
 	if len(validationErrors.Errors) == 0 && len(validationErrors.StructErrors) == 0 {
-		structPool.Return(validationErrors)
+		structPool.Put(validationErrors)
 		return nil
 	}