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This commit is contained in:
48
internal/discovery/model.go
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48
internal/discovery/model.go
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@@ -0,0 +1,48 @@
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package discovery
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import "time"
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// Peer 代表一个可达的网络端点 (Network Endpoint)。
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// 注意：一个物理设备 (Device) 可能通过多个网络接口广播，因此会对应多个 Peer 结构体。
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type Peer struct {
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// ID 是物理设备的全局唯一标识 (UUID/MachineID)。
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// 具有相同 ID 的 Peer 属于同一台物理设备。
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ID string `json:"id"`
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// Name 是设备的主机名或用户设置的显示名称 (如 "Nite's Arch")。
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Name string `json:"name"`
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// Routes 记录了设备的 IP 地址和状态。
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// Key: ip, Value: *RouteState
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Routes map[string]*RouteState `json:"routes"`
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// Port 是文件传输服务的监听端口。
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Port int `json:"port"`
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// IsOnline 标记该端点当前是否活跃 (UI 渲染用)。
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IsOnline bool `json:"is_online"`
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OS OS `json:"os"`
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}
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// RouteState 记录单条路径的状态
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type RouteState struct {
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IP string `json:"ip"`
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LastSeen time.Time `json:"last_seen"` // 该特定 IP 最后一次响应的时间
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}
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type OS string
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const (
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OSLinux OS = "linux"
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OSWindows OS = "windows"
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OSMac OS = "darwin"
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)
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// PresencePacket 是 UDP 广播的载荷
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type PresencePacket struct {
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ID string `json:"id"`
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Name string `json:"name"`
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Port int `json:"port"`
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OS OS `json:"os"`
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}
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269
internal/discovery/service.go
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269
internal/discovery/service.go
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@@ -0,0 +1,269 @@
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package discovery
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import (
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"encoding/json"
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"fmt"
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"log/slog"
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"net"
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"os"
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"path/filepath"
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"runtime"
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"sync"
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"time"
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"github.com/google/uuid"
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"github.com/wailsapp/wails/v3/pkg/application"
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)
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const (
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DiscoveryPort = 9988
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HeartbeatRate = 3 * time.Second
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PeerTimeout = 10 * time.Second
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)
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type Service struct {
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app *application.App
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ID string
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Name string
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FileServerPort int
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// key 使用 peer.id 和 peer.ip 组合而成的 hash
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peers map[string]*Peer
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peersMutex sync.RWMutex
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}
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func init() {
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application.RegisterEvent[[]Peer]("peers:update")
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}
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// getOrInitDeviceID 获取或初始化设备 ID
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func getOrInitDeviceID() string {
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configDir, err := os.UserConfigDir()
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if err != nil {
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return uuid.New().String()
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}
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appDir := filepath.Join(configDir, "mesh-drop")
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if err := os.MkdirAll(appDir, 0755); err != nil {
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return uuid.New().String()
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}
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idFile := filepath.Join(appDir, "device_id")
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if data, err := os.ReadFile(idFile); err == nil {
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return string(data)
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}
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id := uuid.New().String()
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_ = os.WriteFile(idFile, []byte(id), 0644)
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return id
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}
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func NewService(app *application.App, name string, port int) *Service {
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return &Service{
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app: app,
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ID: getOrInitDeviceID(),
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Name: name,
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FileServerPort: port,
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peers: make(map[string]*Peer),
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}
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}
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func (s *Service) startBroadcasting() {
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ticker := time.NewTicker(HeartbeatRate)
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for range ticker.C {
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interfaces, err := net.Interfaces()
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if err != nil {
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slog.Error("Failed to get network interfaces", "error", err, "component", "discovery")
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continue
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}
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packet := PresencePacket{
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ID: s.ID,
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Name: s.Name,
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Port: s.FileServerPort,
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OS: OS(runtime.GOOS),
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}
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data, _ := json.Marshal(packet)
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for _, iface := range interfaces {
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// 过滤掉 Down 的接口和 Loopback 接口
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if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
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continue
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}
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// 获取该接口的地址
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addrs, err := iface.Addrs()
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if err != nil {
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continue
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}
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for _, addr := range addrs {
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ip, ipNet, err := net.ParseCIDR(addr.String())
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if err != nil {
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continue
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}
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if ip.To4() == nil {
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continue
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}
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// 计算该网段的广播地址
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// 例如 IP: 192.168.1.5/24 -> 广播地址: 192.168.1.255
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broadcastIPV4 := make(net.IP, len(ip.To4()))
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copy(broadcastIPV4, ip.To4())
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for i, b := range ipNet.Mask {
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broadcastIPV4[i] |= ^b
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}
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slog.Debug("Broadcast IP", "ip", broadcastIPV4.String(), "component", "discovery")
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s.sendPacketTo(broadcastIPV4.String(), DiscoveryPort, data)
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}
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}
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}
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}
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func (s *Service) sendPacketTo(ip string, port int, data []byte) {
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addr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", ip, port))
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if err != nil {
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return
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}
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conn, err := net.DialUDP("udp", nil, addr)
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if err != nil {
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return
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}
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defer conn.Close()
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_, err = conn.Write(data)
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if err != nil {
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slog.Error("Failed to send packet", "error", err, "component", "discovery")
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return
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}
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}
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func (s *Service) startListening() {
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addr, _ := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", DiscoveryPort))
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conn, err := net.ListenUDP("udp", addr)
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if err != nil {
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slog.Error("Failed to start listening", "error", err, "component", "discovery")
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return
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}
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defer conn.Close()
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buf := make([]byte, 1024)
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for {
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n, remoteAddr, err := conn.ReadFromUDP(buf)
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if err != nil {
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continue
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}
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var packet PresencePacket
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if err := json.Unmarshal(buf[:n], &packet); err != nil {
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continue
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}
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// 忽略自己发出的包
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if packet.ID == s.ID {
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continue
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}
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s.handleHeartbeat(packet, remoteAddr.IP.String())
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}
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}
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// 处理心跳包
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func (s *Service) handleHeartbeat(pkt PresencePacket, ip string) {
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s.peersMutex.Lock()
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peer, exists := s.peers[pkt.ID]
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if !exists {
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// 发现新节点
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peer = &Peer{
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ID: pkt.ID,
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Name: pkt.Name,
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Routes: map[string]*RouteState{
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ip: {
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IP: ip,
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LastSeen: time.Now(),
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},
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},
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Port: pkt.Port,
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OS: pkt.OS,
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}
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s.peers[peer.ID] = peer
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slog.Info("New device found", "name", pkt.Name, "ip", ip, "component", "discovery")
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} else {
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// 更新节点
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peer.Routes[ip] = &RouteState{
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IP: ip,
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LastSeen: time.Now(),
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}
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}
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peer.IsOnline = true
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s.peersMutex.Unlock()
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// 触发前端更新 (防抖逻辑可以之后加，这里每次变动都推)
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s.app.Event.Emit("peers:update", s.GetPeers())
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}
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// 3. 掉线清理协程
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func (s *Service) startCleanup() {
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ticker := time.NewTicker(2 * time.Second)
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for range ticker.C {
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s.peersMutex.Lock()
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changed := false
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now := time.Now()
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for id, peer := range s.peers {
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for ip, route := range peer.Routes {
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// 超过10秒没心跳，认为下线
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if now.Sub(route.LastSeen) > PeerTimeout {
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delete(peer.Routes, ip)
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changed = true
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slog.Info("Device offline", "name", peer.Name, "component", "discovery")
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}
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}
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if len(peer.Routes) == 0 {
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delete(s.peers, id)
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changed = true
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slog.Info("Device offline", "name", peer.Name, "component", "discovery")
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}
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}
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s.peersMutex.Unlock()
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if changed {
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s.app.Event.Emit("peers:update", s.GetPeers())
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}
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}
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}
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func (s *Service) Start() {
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go s.startBroadcasting()
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go s.startListening()
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go s.startCleanup()
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}
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func (s *Service) GetPeerByIP(ip string) *Peer {
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s.peersMutex.RLock()
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defer s.peersMutex.RUnlock()
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for _, p := range s.peers {
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if p.Routes[ip] != nil {
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return p
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}
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}
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return nil
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}
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func (s *Service) GetPeers() []Peer {
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s.peersMutex.RLock()
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defer s.peersMutex.RUnlock()
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list := make([]Peer, 0)
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for _, p := range s.peers {
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list = append(list, *p)
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}
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return list
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}
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func (s *Service) GetName() string {
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return s.Name
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}
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func (s *Service) GetID() string {
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return s.ID
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}
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