Golint (#548)

* linter fixes

* Golint and format code

* fmt

middleware/rewrite/class.go

@@ -12,7 +12,7 @@ type ClassRule struct {
 	fromClass, toClass uint16
 }
 
-// Initializer
+// New initializes rule.
 func (rule ClassRule) New(args ...string) Rule {
 	from, to := args[0], strings.Join(args[1:], " ")
 	return &ClassRule{dns.StringToClass[from], dns.StringToClass[to]}

middleware/rewrite/field.go

@@ -1,11 +1,9 @@
 // Package rewrite is middleware for rewriting requests internally to something different.
 package rewrite
 
-/*
-Additional FIELD keywords may be implemented to support more rewrite use-cases.
-New Rule types must be added to the Fields map.
-The type must implement `New` and `Rewrite` functions.
-*/
+// Fields defines additional FIELD keywords may be implemented to support more rewrite use-cases.
+// New Rule types must be added to the Fields map.
+// The type must implement `New` and `Rewrite` functions.
 var Fields = map[string]Rule{
 	"name":  NameRule{},
 	"type":  TypeRule{},

middleware/rewrite/name.go

@@ -13,7 +13,7 @@ type NameRule struct {
 	From, To string
 }
 
-// Initializer
+// New initializes a new rule.
 func (rule NameRule) New(args ...string) Rule {
 	from, to := args[0], strings.Join(args[1:], " ")
 	return &NameRule{middleware.Name(from).Normalize(), middleware.Name(to).Normalize()}

middleware/rewrite/type.go

@@ -12,7 +12,7 @@ type TypeRule struct {
 	fromType, toType uint16
 }
 
-// Initializer
+// New initializes a rule.
 func (rule TypeRule) New(args ...string) Rule {
 	from, to := args[0], strings.Join(args[1:], " ")
 	return &TypeRule{dns.StringToType[from], dns.StringToType[to]}