272 lines
6.6 KiB
Go
272 lines
6.6 KiB
Go
package transfer
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import (
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"bytes"
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"fmt"
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"io"
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"log/slog"
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"mesh-drop/internal/discovery"
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"net/http"
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"os"
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"path/filepath"
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"sync"
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"github.com/gin-gonic/gin"
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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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type Service struct {
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app *application.App
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port int
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savePath string // 默认下载目录
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// pendingRequests 存储等待用户确认的通道
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// Key: TransferID, Value: Transfer
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transferList sync.Map
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discoveryService *discovery.Service
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}
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func NewService(app *application.App, port int, defaultSavePath string, discoveryService *discovery.Service) *Service {
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gin.SetMode(gin.ReleaseMode)
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return &Service{
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app: app,
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port: port,
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savePath: defaultSavePath,
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discoveryService: discoveryService,
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}
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}
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func init() {
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application.RegisterEvent[application.Void]("transfer:refreshList")
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}
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func (s *Service) GetPort() int {
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return s.port
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}
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func (s *Service) Start() {
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r := gin.Default()
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transfer := r.Group("/transfer")
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{
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transfer.POST("/ask", s.handleAsk)
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transfer.PUT("/upload/:id", s.handleUpload)
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}
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go func() {
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addr := fmt.Sprintf(":%d", s.port)
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slog.Info("Transfer service listening", "address", addr, "component", "transfer")
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if err := r.Run(addr); err != nil {
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slog.Error("Transfer service error", "error", err, "component", "transfer")
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}
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}()
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}
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// handleAsk 处理接收文件请求
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func (s *Service) handleAsk(c *gin.Context) {
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var task Transfer
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// Gin 的 BindJSON 自动处理 JSON 解析
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if err := c.ShouldBindJSON(&task); err != nil {
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c.JSON(http.StatusBadRequest, TransferAskResponse{
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ID: task.ID,
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Message: "Invalid request",
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})
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return
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}
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// 检查是否已经存在
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if _, exists := s.transferList.Load(task.ID); exists {
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// 如果已经存在，说明是网络重试，直接忽略
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return
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}
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// 存储请求
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task.Type = TransferTypeReceive
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task.Status = TransferStatusPending
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task.DecisionChan = make(chan Decision)
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s.transferList.Store(task.ID, task)
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// 通知 Wails 前端
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s.app.Event.Emit("transfer:refreshList")
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// 等待用户决策或发送端放弃
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select {
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case decision := <-task.DecisionChan:
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// 用户决策
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if decision.Accepted {
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task.Status = TransferStatusAccepted
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task.SavePath = decision.SavePath
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token := uuid.New().String()
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task.Token = token
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s.transferList.Store(task.ID, task)
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} else {
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task.Status = TransferStatusRejected
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s.transferList.Store(task.ID, task)
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}
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c.JSON(http.StatusOK, TransferAskResponse{
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ID: task.ID,
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Accepted: decision.Accepted,
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Token: task.Token,
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})
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case <-c.Done():
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// 发送端放弃
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task.Status = TransferStatusCanceled
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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}
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}
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// ResolvePendingRequest 外部调用，解决待处理的传输请求
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// 返回 true 表示成功处理，false 表示未找到该 ID 的请求
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func (s *Service) ResolvePendingRequest(id string, accept bool, savePath string) bool {
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val, ok := s.transferList.Load(id)
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if !ok {
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return false
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}
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task := val.(Transfer)
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task.DecisionChan <- Decision{
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ID: id,
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Accepted: accept,
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SavePath: savePath,
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}
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return true
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}
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// handleUpload 处理接收文件请求
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func (s *Service) handleUpload(c *gin.Context) {
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id := c.Param("id")
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token := c.Query("token")
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if id == "" || token == "" {
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c.JSON(http.StatusBadRequest, TransferUploadResponse{
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ID: id,
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Message: "Invalid request: missing id or token",
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})
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return
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}
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// 获取传输任务
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val, ok := s.transferList.Load(id)
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if !ok {
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c.JSON(http.StatusUnauthorized, TransferUploadResponse{
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ID: id,
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Message: "Invalid request: task not found",
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})
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return
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}
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task := val.(Transfer)
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// 校验 token
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if task.Token != token {
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c.JSON(http.StatusUnauthorized, TransferUploadResponse{
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ID: id,
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Message: "Token mismatch",
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})
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return
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}
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// 校验状态
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if task.Status != TransferStatusAccepted {
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c.JSON(http.StatusForbidden, TransferUploadResponse{
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ID: id,
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Message: "Invalid task status",
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})
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return
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}
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// 更新状态为 active
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task.Status = TransferStatusActive
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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savePath := task.SavePath
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if savePath == "" {
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savePath = s.savePath
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}
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switch task.ContentType {
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case ContentTypeFile:
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destPath := filepath.Join(savePath, task.FileName)
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file, err := os.Create(destPath)
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if err != nil {
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// 接收方无法创建文件，直接报错，任务结束
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c.JSON(http.StatusInternalServerError, TransferUploadResponse{
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ID: task.ID,
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Message: "Receiver failed to create file",
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})
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slog.Error("Failed to create file", "error", err, "component", "transfer")
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Errorf("receiver failed to create file: %v", err).Error()
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s.transferList.Store(task.ID, task)
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// 通知前端传输失败
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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defer file.Close()
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s.receive(c, &task, file)
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case ContentTypeText:
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var buf bytes.Buffer
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s.receive(c, &task, &buf)
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task.Text = buf.String()
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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case ContentTypeFolder:
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// s.receiveFolder(c, savePath, task)
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}
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}
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func (s *Service) receive(c *gin.Context, task *Transfer, writer io.Writer) {
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// 包装 reader，用于计算进度
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reader := &PassThroughReader{
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Reader: c.Request.Body,
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total: task.FileSize,
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callback: func(current, total int64, speed float64) {
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task.Progress = Progress{
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Current: current,
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Total: total,
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Speed: speed,
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}
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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},
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}
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_, err := io.Copy(writer, reader)
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if err != nil {
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// 文件写入失败，直接报错，任务结束
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c.JSON(http.StatusInternalServerError, TransferUploadResponse{
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ID: task.ID,
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Message: "Failed to write file",
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})
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slog.Error("Failed to write file", "error", err, "component", "transfer")
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Errorf("failed to write file: %v", err).Error()
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s.transferList.Store(task.ID, task)
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// 通知前端传输失败
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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c.JSON(http.StatusOK, TransferUploadResponse{
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ID: task.ID,
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Message: "File received successfully",
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})
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// 传输成功，任务结束
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task.Status = TransferStatusCompleted
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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}
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func (s *Service) GetTransferList() []Transfer {
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var requests []Transfer
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s.transferList.Range(func(key, value any) bool {
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requests = append(requests, value.(Transfer))
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return true
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})
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return requests
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}
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