feat: refactor resolver in separate package

pkg/models/models.go

@@ -0,0 +1,40 @@
+package models
+
+import "time"
+
+const (
+	// DefaultTLSPort specifies the default port for a DNS server connecting over TCP over TLS
+	DefaultTLSPort = "853"
+	// DefaultUDPPort specifies the default port for a DNS server connecting over UDP
+	DefaultUDPPort = "53"
+	// DefaultTCPPort specifies the default port for a DNS server connecting over TCP
+	DefaultTCPPort = "53"
+	UDPResolver    = "udp"
+	DOHResolver    = "doh"
+	TCPResolver    = "tcp"
+	DOTResolver    = "dot"
+)
+
+// QueryFlags is used store the query params
+// supplied by the user.
+type QueryFlags struct {
+	QNames           []string      `koanf:"query"`
+	QTypes           []string      `koanf:"type"`
+	QClasses         []string      `koanf:"class"`
+	Nameservers      []string      `koanf:"nameserver"`
+	UseIPv4          bool          `koanf:"ipv4"`
+	UseIPv6          bool          `koanf:"ipv6"`
+	DisplayTimeTaken bool          `koanf:"time"`
+	ShowJSON         bool          `koanf:"json"`
+	UseSearchList    bool          `koanf:"search"`
+	Ndots            int           `koanf:"ndots"`
+	Color            bool          `koanf:"color"`
+	Timeout          time.Duration `koanf:"timeout"`
+}
+
+// Nameserver represents the type of Nameserver
+// along with the server address.
+type Nameserver struct {
+	Address string
+	Type    string
+}