feat: Refactor output format

pkg/resolvers/resolver.go

@@ -4,20 +4,58 @@ import (
 	"time"
 
 	"github.com/miekg/dns"
+	"github.com/sirupsen/logrus"
 )
 
+// Options represent a set of common options
+// to configure a Resolver.
+type Options struct {
+	SearchList []string
+	Ndots      int
+	Timeout    time.Duration
+	Logger     *logrus.Logger
+}
+
 // Resolver implements the configuration for a DNS
 // Client. Different types of providers can load
 // a DNS Resolver satisfying this interface.
 type Resolver interface {
-	Lookup([]dns.Question) ([]Response, error)
+	Lookup(dns.Question) (Response, error)
 }
 
 // Response represents a custom output format
 // for DNS queries. It wraps metadata about the DNS query
 // and the DNS Answer as well.
 type Response struct {
-	Message    dns.Msg
-	RTT        time.Duration
-	Nameserver string
+	Answers     []Answer    `json:"answers"`
+	Authorities []Authority `json:"authorities"`
+	Questions   []Question  `json:"questions"`
+}
+
+type Question struct {
+	Name  string `json:"name"`
+	Type  string `json:"type"`
+	Class string `json:"class"`
+}
+
+type Answer struct {
+	Name       string `json:"name"`
+	Type       string `json:"type"`
+	Class      string `json:"class"`
+	TTL        string `json:"ttl"`
+	Address    string `json:"address"`
+	Status     string `json:"status"`
+	RTT        string `json:"rtt"`
+	Nameserver string `json:"nameserver"`
+}
+
+type Authority struct {
+	Name       string `json:"name"`
+	Type       string `json:"type"`
+	Class      string `json:"class"`
+	TTL        string `json:"ttl"`
+	MName      string `json:"mname"`
+	Status     string `json:"status"`
+	RTT        string `json:"rtt"`
+	Nameserver string `json:"nameserver"`
 }