lnwire: add DNSAddress type

lnwire/dns_addr.go

@@ -0,0 +1,31 @@
+package lnwire
+
+import (
+	"net"
+	"strconv"
+)
+
+// DNSAddress is used to represent a DNS address of a node.
+type DNSAddress struct {
+	// Hostname is the DNS hostname of the address. This MUST only contain
+	// ASCII characters as per Bolt #7. The maximum length that this may
+	// be is 255 bytes.
+	Hostname string
+
+	// Port is the port number of the address.
+	Port uint16
+}
+
+// A compile-time check to ensure that DNSAddress implements the net.Addr
+// interface.
+var _ net.Addr = (*DNSAddress)(nil)
+
+// Network returns the network that this address uses, which is "tcp".
+func (d *DNSAddress) Network() string {
+	return "tcp"
+}
+
+// String returns the address in the form "hostname:port".
+func (d *DNSAddress) String() string {
+	return net.JoinHostPort(d.Hostname, strconv.Itoa(int(d.Port)))
+}