simple server relay with clients
This commit is contained in:
juancwu
parent
91b369ff53
commit
9984583dd2
6 changed files with 358 additions and 7 deletions
183
cmd/client/main.go
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183
cmd/client/main.go
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@ -0,0 +1,183 @@
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package main
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import (
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"crypto/rand"
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"encoding/base64"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"log"
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"strings"
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"gossip/pkg/protocol"
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"github.com/charmbracelet/bubbles/textarea"
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"github.com/charmbracelet/bubbles/viewport"
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tea "github.com/charmbracelet/bubbletea"
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"github.com/gorilla/websocket"
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"golang.org/x/crypto/nacl/box"
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)
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type KeyPair struct {
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Public *[32]byte
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Private *[32]byte
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PubHex string
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}
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type model struct {
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conn *websocket.Conn
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keys KeyPair
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targetHex string
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targetPub *[32]byte
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viewport viewport.Model
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textarea textarea.Model
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messages []string
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err error
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}
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type wsMsg protocol.Message
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func main() {
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pub, priv, err := box.GenerateKey(rand.Reader)
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if err != nil {
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log.Fatal(err)
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}
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keys := KeyPair{Public: pub, Private: priv, PubHex: hex.EncodeToString(pub[:])}
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c, _, err := websocket.DefaultDialer.Dial("ws://localhost:8080/ws", nil)
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if err != nil {
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log.Fatal("Could not connect to server:", err)
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}
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defer c.Close()
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loginMsg := protocol.Message{Type: "login", Sender: keys.PubHex}
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c.WriteJSON(loginMsg)
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ta := textarea.New()
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ta.Placeholder = "Type a message (or /connect <PUBKEY>)..."
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ta.Focus()
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ta.SetHeight(2)
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ta.ShowLineNumbers = false
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vp := viewport.New(80, 20)
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vp.SetContent(fmt.Sprintf("Your ID: %s\nTo start, type: /connect <FRIEND_ID>", keys.PubHex))
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m := model{
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conn: c,
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keys: keys,
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textarea: ta,
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viewport: vp,
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}
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p := tea.NewProgram(m)
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go func() {
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for {
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_, data, err := c.ReadMessage()
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if err != nil {
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return
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}
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var msg protocol.Message
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json.Unmarshal(data, &msg)
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p.Send(wsMsg(msg))
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}
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}()
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if _, err := p.Run(); err != nil {
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log.Fatal(err)
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}
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}
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func (m model) Init() tea.Cmd {
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return textarea.Blink
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}
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func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
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var (
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tiCmd tea.Cmd
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vpCmd tea.Cmd
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)
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switch msg := msg.(type) {
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case tea.KeyMsg:
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switch msg.Type {
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case tea.KeyCtrlC, tea.KeyEsc:
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return m, tea.Quit
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case tea.KeyEnter:
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input := m.textarea.Value()
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if input == "" {
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return m, nil
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}
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if dest, ok := strings.CutPrefix(input, "/connect "); ok {
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m.targetHex = dest
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decoded, _ := hex.DecodeString(dest)
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var keyArr [32]byte
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copy(keyArr[:], decoded)
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m.targetPub = &keyArr
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m.messages = append(m.messages, "System: Target set to "+dest[:8]+"...")
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m.viewport.SetContent(strings.Join(m.messages, "\n"))
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m.textarea.Reset()
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m.viewport.GotoBottom()
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return m, nil
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}
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if m.targetPub == nil {
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m.messages = append(m.messages, "System: No target set! Use /connect first.")
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} else {
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var nonce [24]byte
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rand.Read(nonce[:])
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encrypted := box.Seal(nonce[:], []byte(input), &nonce, m.targetPub, m.keys.Private)
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b64Content := base64.StdEncoding.EncodeToString(encrypted)
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outMsg := protocol.Message{
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Type: "msg",
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Sender: m.keys.PubHex,
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Target: m.targetHex,
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Content: b64Content,
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}
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m.conn.WriteJSON(outMsg)
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m.messages = append(m.messages, "Me: "+input)
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}
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m.textarea.Reset()
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m.viewport.SetContent(strings.Join(m.messages, "\n"))
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m.viewport.GotoBottom()
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}
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case wsMsg:
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encBytes, _ := base64.StdEncoding.DecodeString(msg.Content)
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senderBytes, _ := hex.DecodeString(msg.Sender)
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var senderKey [32]byte
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copy(senderKey[:], senderBytes)
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var nonce [24]byte
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copy(nonce[:], encBytes[:24])
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decrypted, ok := box.Open(nil, encBytes[24:], &nonce, &senderKey, m.keys.Private)
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if !ok {
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m.messages = append(m.messages, "System: Failed to decrypt message from "+msg.Sender[:8])
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} else {
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m.messages = append(m.messages, fmt.Sprintf("Friend (%s): %s", msg.Sender[:8], string(decrypted)))
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}
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m.viewport.SetContent(strings.Join(m.messages, "\n"))
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m.viewport.GotoBottom()
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}
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m.textarea, tiCmd = m.textarea.Update(msg)
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m.viewport, vpCmd = m.viewport.Update(msg)
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return m, tea.Batch(tiCmd, vpCmd)
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}
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func (m model) View() string {
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return fmt.Sprintf(
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"%s\n\n%s",
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m.viewport.View(),
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m.textarea.View(),
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) + "\n\nPress Esc to quit."
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}
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83
cmd/server/main.go
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83
cmd/server/main.go
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package main
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import (
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"encoding/json"
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"log"
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"net/http"
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"sync"
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"gossip/pkg/protocol"
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"github.com/gorilla/websocket"
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)
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type Server struct {
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clients map[string]*websocket.Conn
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mu sync.Mutex
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upgrader websocket.Upgrader
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}
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func main() {
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srv := &Server{
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clients: make(map[string]*websocket.Conn),
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upgrader: websocket.Upgrader{
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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CheckOrigin: func(r *http.Request) bool { return true },
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},
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}
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http.HandleFunc("/ws", srv.handleWS)
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log.Println("Relay Server listening on :8080")
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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func (s *Server) handleWS(w http.ResponseWriter, r *http.Request) {
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conn, err := s.upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Println("Upgrade error:", err)
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return
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}
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defer conn.Close()
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var myPubKey string
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for {
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_, data, err := conn.ReadMessage()
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if err != nil {
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break
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}
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var msg protocol.Message
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if err := json.Unmarshal(data, &msg); err != nil {
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continue
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}
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switch msg.Type {
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case "login":
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s.mu.Lock()
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s.clients[msg.Sender] = conn
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s.mu.Unlock()
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myPubKey = msg.Sender
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log.Printf("Client connected: %s...", myPubKey[:8])
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case "msg":
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s.mu.Lock()
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targetConn, ok := s.clients[msg.Target]
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s.mu.Unlock()
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if ok {
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err = targetConn.WriteMessage(websocket.TextMessage, data)
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if err != nil {
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log.Printf("Failed to relay to %s", msg.Target[:8])
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}
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}
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}
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}
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if myPubKey != "" {
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s.mu.Lock()
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delete(s.clients, myPubKey)
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s.mu.Unlock()
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log.Printf("Client disconnected: %s...", myPubKey[:8])
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}
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}
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29
go.mod
29
go.mod
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module gossip
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module gossip
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go 1.25.1
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go 1.25.1
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require (
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github.com/charmbracelet/bubbles v0.21.0
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github.com/charmbracelet/bubbletea v1.3.10
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github.com/gorilla/websocket v1.5.3
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golang.org/x/crypto v0.45.0
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)
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require (
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github.com/atotto/clipboard v0.1.4 // indirect
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github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
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github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc // indirect
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github.com/charmbracelet/lipgloss v1.1.0 // indirect
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github.com/charmbracelet/x/ansi v0.10.1 // indirect
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github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
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github.com/charmbracelet/x/term v0.2.1 // indirect
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github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
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github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
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github.com/mattn/go-isatty v0.0.20 // indirect
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github.com/mattn/go-localereader v0.0.1 // indirect
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github.com/mattn/go-runewidth v0.0.16 // indirect
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github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
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github.com/muesli/cancelreader v0.2.2 // indirect
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github.com/muesli/termenv v0.16.0 // indirect
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github.com/rivo/uniseg v0.4.7 // indirect
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github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
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golang.org/x/sys v0.38.0 // indirect
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golang.org/x/text v0.31.0 // indirect
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)
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55
go.sum
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55
go.sum
Normal file
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@ -0,0 +1,55 @@
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github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ=
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github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE=
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github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
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github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
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github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
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github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
|
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github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
|
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github.com/aymanbagabas/go-udiff v0.2.0/go.mod h1:RE4Ex0qsGkTAJoQdQQCA0uG+nAzJO/pI/QwceO5fgrA=
|
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|
github.com/charmbracelet/bubbles v0.21.0 h1:9TdC97SdRVg/1aaXNVWfFH3nnLAwOXr8Fn6u6mfQdFs=
|
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github.com/charmbracelet/bubbles v0.21.0/go.mod h1:HF+v6QUR4HkEpz62dx7ym2xc71/KBHg+zKwJtMw+qtg=
|
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|
github.com/charmbracelet/bubbletea v1.3.10 h1:otUDHWMMzQSB0Pkc87rm691KZ3SWa4KUlvF9nRvCICw=
|
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|
github.com/charmbracelet/bubbletea v1.3.10/go.mod h1:ORQfo0fk8U+po9VaNvnV95UPWA1BitP1E0N6xJPlHr4=
|
||||||
|
github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc h1:4pZI35227imm7yK2bGPcfpFEmuY1gc2YSTShr4iJBfs=
|
||||||
|
github.com/charmbracelet/colorprofile v0.2.3-0.20250311203215-f60798e515dc/go.mod h1:X4/0JoqgTIPSFcRA/P6INZzIuyqdFY5rm8tb41s9okk=
|
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|
github.com/charmbracelet/lipgloss v1.1.0 h1:vYXsiLHVkK7fp74RkV7b2kq9+zDLoEU4MZoFqR/noCY=
|
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|
github.com/charmbracelet/lipgloss v1.1.0/go.mod h1:/6Q8FR2o+kj8rz4Dq0zQc3vYf7X+B0binUUBwA0aL30=
|
||||||
|
github.com/charmbracelet/x/ansi v0.10.1 h1:rL3Koar5XvX0pHGfovN03f5cxLbCF2YvLeyz7D2jVDQ=
|
||||||
|
github.com/charmbracelet/x/ansi v0.10.1/go.mod h1:3RQDQ6lDnROptfpWuUVIUG64bD2g2BgntdxH0Ya5TeE=
|
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|
github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd h1:vy0GVL4jeHEwG5YOXDmi86oYw2yuYUGqz6a8sLwg0X8=
|
||||||
|
github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
|
||||||
|
github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
|
||||||
|
github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
|
||||||
|
github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
|
||||||
|
github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
|
||||||
|
github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
|
||||||
|
github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
|
||||||
|
github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
|
||||||
|
github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
|
||||||
|
github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
|
||||||
|
github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
|
||||||
|
github.com/mattn/go-localereader v0.0.1 h1:ygSAOl7ZXTx4RdPYinUpg6W99U8jWvWi9Ye2JC/oIi4=
|
||||||
|
github.com/mattn/go-localereader v0.0.1/go.mod h1:8fBrzywKY7BI3czFoHkuzRoWE9C+EiG4R1k4Cjx5p88=
|
||||||
|
github.com/mattn/go-runewidth v0.0.16 h1:E5ScNMtiwvlvB5paMFdw9p4kSQzbXFikJ5SQO6TULQc=
|
||||||
|
github.com/mattn/go-runewidth v0.0.16/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
|
||||||
|
github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 h1:ZK8zHtRHOkbHy6Mmr5D264iyp3TiX5OmNcI5cIARiQI=
|
||||||
|
github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6/go.mod h1:CJlz5H+gyd6CUWT45Oy4q24RdLyn7Md9Vj2/ldJBSIo=
|
||||||
|
github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELUXHmA=
|
||||||
|
github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
|
||||||
|
github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
|
||||||
|
github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
|
||||||
|
github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
|
||||||
|
github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
|
||||||
|
github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
|
||||||
|
github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavMF/ppJZNG9ZpyihvCd0w101no=
|
||||||
|
github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
|
||||||
|
golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q=
|
||||||
|
golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4=
|
||||||
|
golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561 h1:MDc5xs78ZrZr3HMQugiXOAkSZtfTpbJLDr/lwfgO53E=
|
||||||
|
golang.org/x/exp v0.0.0-20220909182711-5c715a9e8561/go.mod h1:cyybsKvd6eL0RnXn6p/Grxp8F5bW7iYuBgsNCOHpMYE=
|
||||||
|
golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||||
|
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
|
||||||
|
golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
|
||||||
|
golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
|
||||||
|
golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
|
||||||
|
golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
|
||||||
7
main.go
7
main.go
|
|
@ -1,7 +0,0 @@
|
||||||
package main
|
|
||||||
|
|
||||||
import "fmt"
|
|
||||||
|
|
||||||
func main() {
|
|
||||||
fmt.Println("Let the gossip start")
|
|
||||||
}
|
|
||||||
8
pkg/protocol/types.go
Normal file
8
pkg/protocol/types.go
Normal file
|
|
@ -0,0 +1,8 @@
|
||||||
|
package protocol
|
||||||
|
|
||||||
|
type Message struct {
|
||||||
|
Type string `json:"type"`
|
||||||
|
Sender string `json:"sender"`
|
||||||
|
Target string `json:"target"`
|
||||||
|
Content string `json:"content"`
|
||||||
|
}
|
||||||
Loading…
Add table
Add a link
Reference in a new issue