Initial commit.

Commands.go

@@ -0,0 +1,73 @@
+/*
+File Name:  Commands.go
+Copyright:  2021 Peernet Foundation s.r.o.
+Author:     Peter Kleissner
+*/
+
+package core
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/btcsuite/btcd/btcec"
+)
+
+// packet2 is a high-level message between peers
+type packet2 struct {
+	packetRaw
+	SenderPublicKey *btcec.PublicKey // Sender Public Key, ECDSA (secp256k1) 257-bit
+	network         *Network         // network which received the packet
+	address         *net.UDPAddr     // address of the sender or receiver
+}
+
+// announcement handles an incoming announcement
+func (peer *PeerInfo) announcement(msg *packet2) {
+	if peer == nil {
+		peer, added := PeerlistAdd(msg.SenderPublicKey, &Connection{Network: msg.network, Address: msg.address})
+		fmt.Printf("Incoming initial announcement from %s\n", msg.address.String())
+
+		// send the Response
+		if added {
+			peer.send(&packetRaw{Command: 1})
+		}
+
+		return
+	}
+	fmt.Printf("Incoming secondary announcement from %s\n", msg.address.String())
+
+	// Announcement from existing peer means the peer most likely restarted
+	peer.send(&packetRaw{Command: 1})
+}
+
+// response handles the response to the announcement
+func (peer *PeerInfo) response(msg *packet2) {
+	if peer == nil {
+		peer, _ = PeerlistAdd(msg.SenderPublicKey, &Connection{Network: msg.network, Address: msg.address})
+		fmt.Printf("Incoming initial response from %s\n", msg.address.String())
+
+		return
+	}
+
+	fmt.Printf("Incoming response from %s on %s\n", msg.address.String(), msg.network.address.String())
+}
+
+// chat handles a chat message [debug]
+func (peer *PeerInfo) chat(msg *packet2) {
+	fmt.Printf("Chat from '%s': %s\n", msg.address.String(), string(msg.packetRaw.Payload))
+}
+
+// autoPingAll automatically pings all peers. This has multiple important reasons:
+// * Keeping the UDP port open at NAT, if applicable
+// * Making sure to recognize invalid connections and drop them.
+func autoPingAll() {
+
+	// TODO: If peer was previously unresponsive for X times, start pinging on all available ports.
+}
+
+// SendChatAll sends a text message to all peers
+func SendChatAll(text string) {
+	for _, peer := range PeerlistGet() {
+		peer.send(&packetRaw{Command: 10, Payload: []byte(text)})
+	}
+}