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file_transfer_default.go
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file_transfer_default.go
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package filetransfer
import (
"fmt"
"io"
"math"
"net/http"
"os"
"path"
"strings"
"github.com/hashicorp/go-retryablehttp"
"github.com/wandb/wandb/core/pkg/observability"
)
// DefaultFileTransfer uploads or downloads files to/from the server
type DefaultFileTransfer struct {
// client is the HTTP client for the file transfer
client *retryablehttp.Client
// logger is the logger for the file transfer
logger *observability.CoreLogger
// fileTransferStats is used to track upload/download progress
fileTransferStats FileTransferStats
}
// NewDefaultFileTransfer creates a new fileTransfer
func NewDefaultFileTransfer(
client *retryablehttp.Client,
logger *observability.CoreLogger,
fileTransferStats FileTransferStats,
) *DefaultFileTransfer {
fileTransfer := &DefaultFileTransfer{
logger: logger,
client: client,
fileTransferStats: fileTransferStats,
}
return fileTransfer
}
// Upload uploads a file to the server
func (ft *DefaultFileTransfer) Upload(task *Task) error {
ft.logger.Debug("default file transfer: uploading file", "path", task.Path, "url", task.Url)
// open the file for reading and defer closing it
file, err := os.Open(task.Path)
if err != nil {
return err
}
defer func(file *os.File) {
err := file.Close()
if err != nil {
ft.logger.CaptureError("file transfer: upload: error closing file", err, "path", task.Path)
}
}(file)
stat, err := file.Stat()
if err != nil {
ft.logger.CaptureError("file transfer: upload: error getting file size", err, "path", task.Path)
return err
}
// Don't try to upload directories.
if stat.IsDir() {
return fmt.Errorf(
"file transfer: upload: cannot upload directory %v",
task.Path,
)
}
task.Size = stat.Size()
progressReader, err := NewProgressReader(
file,
task.Size,
func(processed int, total int) {
if task.ProgressCallback != nil {
task.ProgressCallback(processed, total)
}
ft.fileTransferStats.UpdateUploadStats(FileUploadInfo{
FileKind: task.FileKind,
Path: task.Path,
UploadedBytes: int64(processed),
TotalBytes: int64(total),
})
},
)
if err != nil {
return err
}
req, err := retryablehttp.NewRequest(http.MethodPut, task.Url, progressReader)
if err != nil {
return err
}
for _, header := range task.Headers {
parts := strings.SplitN(header, ":", 2)
if len(parts) != 2 {
ft.logger.Error("file transfer: upload: invalid header", "header", header)
continue
}
req.Header.Set(parts[0], parts[1])
}
if task.Context != nil {
req = req.WithContext(task.Context)
}
resp, err := ft.client.Do(req)
if err != nil {
return err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return fmt.Errorf("file transfer: upload: failed to upload: %s", resp.Status)
}
return nil
}
// Download downloads a file from the server
func (ft *DefaultFileTransfer) Download(task *Task) error {
ft.logger.Debug("default file transfer: downloading file", "path", task.Path, "url", task.Url)
dir := path.Dir(task.Path)
// Check if the directory already exists
if _, err := os.Stat(dir); os.IsNotExist(err) {
// Directory doesn't exist, create it
if err := os.MkdirAll(dir, os.ModePerm); err != nil {
// Handle the error if it occurs
return err
}
} else if err != nil {
// Handle other errors that may occur while checking directory existence
return err
}
// TODO: redo it to use the progress writer, to track the download progress
resp, err := ft.client.Get(task.Url)
if err != nil {
return err
}
// open the file for writing and defer closing it
file, err := os.Create(task.Path)
if err != nil {
return err
}
defer func(file *os.File) {
if err := file.Close(); err != nil {
ft.logger.CaptureError("file transfer: download: error closing file", err, "path", task.Path)
}
}(file)
defer func(file io.ReadCloser) {
if err := file.Close(); err != nil {
ft.logger.CaptureError("file transfer: download: error closing response reader", err, "path", task.Path)
}
}(resp.Body)
_, err = io.Copy(file, resp.Body)
if err != nil {
return err
}
return nil
}
type ProgressReader struct {
// Note: this turns ProgressReader into a ReadSeeker, not just a Reader!
// The retryablehttp client will seek to 0 on every retry.
*os.File
len int
read int
callback func(processed, total int)
}
func NewProgressReader(file *os.File, size int64, callback func(processed, total int)) (*ProgressReader, error) {
if size > math.MaxInt {
return &ProgressReader{}, fmt.Errorf("file larger than %v", math.MaxInt)
}
return &ProgressReader{
File: file,
len: int(size),
callback: callback,
}, nil
}
func (pr *ProgressReader) Read(p []byte) (int, error) {
n, err := pr.File.Read(p)
if err != nil {
return n, err // Return early if there's an error
}
pr.read += n
if pr.callback != nil {
pr.callback(pr.read, pr.len)
}
return n, err
}
func (pr *ProgressReader) Len() int {
return pr.len
}