417 lines
10 KiB
Go
417 lines
10 KiB
Go
package transfer
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import (
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"archive/tar"
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"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log/slog"
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"math"
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"mesh-drop/internal/discovery"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"github.com/google/uuid"
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)
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func (s *Service) SendFile(target *discovery.Peer, targetIP string, filePath string) {
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taskID := uuid.New().String()
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ctx, cancel := context.WithCancel(context.Background())
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s.cancelMap.Store(taskID, cancel)
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// 任务结束后清理 ctx
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defer func() {
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s.cancelMap.Delete(taskID)
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cancel()
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}()
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file, err := os.Open(filePath)
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if err != nil {
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slog.Error("Failed to open file", "path", filePath, "error", err, "component", "transfer-client")
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return
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}
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defer file.Close()
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stat, err := file.Stat()
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if err != nil {
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return
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}
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task := Transfer{
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ID: taskID,
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FileName: filepath.Base(filePath),
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FileSize: stat.Size(),
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Sender: Sender{
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ID: s.discoveryService.GetID(),
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Name: s.discoveryService.GetName(),
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},
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Type: TransferTypeSend,
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Status: TransferStatusPending,
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ContentType: ContentTypeFile,
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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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askResp, err := s.ask(ctx, target, targetIP, task)
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if err != nil {
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if errors.Is(err, context.Canceled) {
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task.Status = TransferStatusCanceled
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} else {
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// 如果请求发送失败，更新状态为 Error
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Sprintf("Failed to connect to receiver: %v", err)
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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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return
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}
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if askResp.Accepted {
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s.processTransfer(ctx, askResp, target, targetIP, task, file)
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} else {
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// 接收方拒绝
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task.Status = TransferStatusRejected
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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}
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func (s *Service) SendFolder(target *discovery.Peer, targetIP string, folderPath string) {
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taskID := uuid.New().String()
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ctx, cancel := context.WithCancel(context.Background())
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s.cancelMap.Store(taskID, cancel)
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// 任务结束后清理 ctx
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defer func() {
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s.cancelMap.Delete(taskID)
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cancel()
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}()
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size, err := calculateTarSize(ctx, folderPath)
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if err != nil {
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slog.Error("Failed to calculate folder size", "path", folderPath, "error", err, "component", "transfer-client")
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return
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}
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task := Transfer{
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ID: taskID,
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FileName: filepath.Base(folderPath),
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FileSize: size,
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Sender: Sender{
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ID: s.discoveryService.GetID(),
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Name: s.discoveryService.GetName(),
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},
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Type: TransferTypeSend,
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Status: TransferStatusPending,
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ContentType: ContentTypeFolder,
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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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askResp, err := s.ask(ctx, target, targetIP, task)
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if err != nil {
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// 如果请求发送失败，更新状态为 Error
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Sprintf("Failed to connect to receiver: %v", err)
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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if askResp.Accepted {
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r, w := io.Pipe()
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go func(ctx context.Context) {
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defer w.Close()
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if err := streamFolderToTar(ctx, w, folderPath); err != nil {
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slog.Error("Failed to stream folder to tar", "error", err, "component", "transfer-client")
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w.CloseWithError(err)
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}
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}(ctx)
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s.processTransfer(ctx, askResp, target, targetIP, task, r)
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} else {
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// 接收方拒绝
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task.Status = TransferStatusRejected
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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}
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func (s *Service) SendText(target *discovery.Peer, targetIP string, text string) {
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taskID := uuid.New().String()
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ctx, cancel := context.WithCancel(context.Background())
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s.cancelMap.Store(taskID, cancel)
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// 任务结束后清理 ctx
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defer func() {
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s.cancelMap.Delete(taskID)
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cancel()
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}()
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r := bytes.NewReader([]byte(text))
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task := Transfer{
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ID: taskID,
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FileName: "",
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FileSize: int64(len(text)),
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Sender: Sender{
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ID: s.discoveryService.GetID(),
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Name: s.discoveryService.GetName(),
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},
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Type: TransferTypeSend,
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Status: TransferStatusPending,
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ContentType: ContentTypeText,
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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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askResp, err := s.ask(ctx, target, targetIP, task)
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if err != nil {
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// 如果请求发送失败，更新状态为 Error
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Sprintf("Failed to connect to receiver: %v", err)
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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if askResp.Accepted {
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s.processTransfer(ctx, askResp, target, targetIP, task, r)
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} else {
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// 接收方拒绝
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task.Status = TransferStatusRejected
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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}
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// ask 向接收端发送传输请求
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func (s *Service) ask(ctx context.Context, target *discovery.Peer, targetIP string, task Transfer) (TransferAskResponse, error) {
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if err := ctx.Err(); err != nil {
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return TransferAskResponse{}, err
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}
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// 发送请求
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askBody, _ := json.Marshal(task)
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askUrl := fmt.Sprintf("http://%s:%d/transfer/ask", targetIP, target.Port)
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req, err := http.NewRequestWithContext(ctx, http.MethodPost, askUrl, bytes.NewReader(askBody))
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req.Header.Set("Content-Type", "application/json")
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if err != nil {
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return TransferAskResponse{}, err
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return TransferAskResponse{}, err
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}
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defer resp.Body.Close()
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var askResp TransferAskResponse
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if err := json.NewDecoder(resp.Body).Decode(&askResp); err != nil {
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return TransferAskResponse{}, err
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}
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if resp.StatusCode != http.StatusOK {
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return TransferAskResponse{}, errors.New(askResp.Message)
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}
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return askResp, nil
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}
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// processTransfer 传输数据
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func (s *Service) processTransfer(ctx context.Context, askResp TransferAskResponse, target *discovery.Peer, targetIP string, task Transfer, payload io.Reader) {
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if err := ctx.Err(); err != nil {
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return
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}
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uploadUrl, _ := url.Parse(fmt.Sprintf("http://%s:%d/transfer/upload/%s", targetIP, target.Port, task.ID))
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query := uploadUrl.Query()
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query.Add("token", askResp.Token)
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uploadUrl.RawQuery = query.Encode()
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reader := &PassThroughReader{
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Reader: payload,
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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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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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},
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}
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req, err := http.NewRequestWithContext(ctx, http.MethodPut, uploadUrl.String(), reader)
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if err != nil {
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return
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}
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req.ContentLength = task.FileSize
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req.Header.Set("Content-Type", "application/octet-stream")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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if errors.Is(err, context.Canceled) {
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task.Status = TransferStatusCanceled
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} else {
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task.Status = TransferStatusError
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task.ErrorMsg = fmt.Sprintf("Failed to upload file: %v", err)
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slog.Error("Failed to upload file", "url", uploadUrl.String(), "error", err, "component", "transfer-client")
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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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return
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}
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defer resp.Body.Close()
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var uploadResp TransferUploadResponse
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if err := json.NewDecoder(resp.Body).Decode(&uploadResp); err != nil {
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return
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}
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if resp.StatusCode != http.StatusOK {
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task.Status = TransferStatusError
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task.ErrorMsg = uploadResp.Message
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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}
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// 判断任务完成还是被接收端取消
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if uploadResp.Status == TransferStatusCanceled {
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task.Status = TransferStatusCanceled
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task.ErrorMsg = uploadResp.Message
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s.transferList.Store(task.ID, task)
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s.app.Event.Emit("transfer:refreshList")
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return
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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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type countWriter struct {
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n int64
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}
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func (w *countWriter) Write(p []byte) (int, error) {
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w.n += int64(len(p))
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return len(p), nil
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}
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func calculateTarSize(ctx context.Context, srcPath string) (int64, error) {
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var size int64
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err := filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if ctx.Err() != nil {
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return ctx.Err()
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}
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// 计算相对路径
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relPath, err := filepath.Rel(srcPath, path)
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if err != nil {
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return err
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}
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if relPath == "." {
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return nil
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}
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// 使用 tar.FileInfoHeader 计算 header
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header, err := tar.FileInfoHeader(info, "")
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if err != nil {
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return err
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}
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// 保持与 streamFolderToTar 一致
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header.Name = filepath.ToSlash(relPath)
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if info.IsDir() {
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header.Name += "/"
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}
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cw := &countWriter{}
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tw := tar.NewWriter(cw)
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if err := tw.WriteHeader(header); err != nil {
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return err
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}
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// tw.WriteHeader 写入 header blocks（包括扩展头）
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size += cw.n
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if !info.IsDir() {
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// 文件内容大小 + 填充
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fileSize := info.Size()
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blocks := math.Ceil(float64(fileSize) / 512)
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size += int64(blocks) * 512
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}
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return nil
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})
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// 两个 512 字节的空块作为结束标记
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size += 1024
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return size, err
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}
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func streamFolderToTar(ctx context.Context, w io.Writer, srcPath string) error {
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tw := tar.NewWriter(w)
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defer tw.Close()
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return filepath.Walk(srcPath, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if ctx.Err() != nil {
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return ctx.Err()
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}
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relPath, err := filepath.Rel(srcPath, path)
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if err != nil {
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return err
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}
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if relPath == "." {
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return nil
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}
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slog.Debug("Processing file", "path", path, "relPath", relPath, "component", "transfer-client")
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header, err := tar.FileInfoHeader(info, "")
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if err != nil {
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return err
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}
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// tar 文件名使用正斜杠
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header.Name = filepath.ToSlash(relPath)
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if info.IsDir() {
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header.Name += "/"
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}
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if err := tw.WriteHeader(header); err != nil {
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return err
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}
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if !info.IsDir() {
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file, err := os.Open(path)
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if err != nil {
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return err
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}
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defer file.Close()
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if _, err := io.Copy(tw, file); err != nil {
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return err
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}
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}
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return nil
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})
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}
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