Added comments

dns_manager.go

@@ -2,6 +2,7 @@ package dns_manager
 
 type RecordType string
 
+// Defining supported record types
 const (
 	None  RecordType = "None essential"
 	A     RecordType = "A"
@@ -11,6 +12,8 @@ const (
 	TXT   RecordType = "TXT"
 )
 
+// This is the DNS record structure.
+// Ready to be marshaled into JSON
 type Record struct {
 	Type    RecordType `json:"type,omitempty"`
 	Name    string     `json:"name,omitempty"`
@@ -18,6 +21,15 @@ type Record struct {
 	TTL     uint       `json:"ttl,omitempty"`
 }
 
+// This is representation of simple API response
+// to driver query
+type Response struct {
+	Error   string `json:"error"`
+	Message string `json:"message"`
+}
+
+// The core of library<->drivers architecture
+// All drivers must implement those methods
 type Actions interface {
 	AddRecord(*Record) (*Response, error)
 	DeleteRecord(*Record) (*Response, error)
@@ -25,15 +37,15 @@ type Actions interface {
 	GetRecords() ([]*Record, error)
 }
 
+// This is local scope interface that defines
+// method New() which must be implemented by all
+// libraries. The New() represents fabric method.
 type manager interface {
 	New() (Actions, error)
 }
 
-type Response struct {
-	Error   string `json:"error"`
-	Message string `json:"message"`
-}
-
+// Naive method that checks if record type is
+// supported by this library.
 func (rt RecordType) Check() bool {
 	switch rt {
 	case None, A, AAAA, MX, CNAME, TXT: