tusgo

Full-featured Go client for TUS, a protocol for resumable uploads built on HTTP.

Documentation is available at pkg.go.dev

Features

• Resumable Upload writer with chunked and streamed mode support. Conforms the io.Writer/io.ReaderFrom, which allows to use the standard utils such as io.Copy
• Client for Upload manipulation such as creation, deletion, concatenation, etc.
• Intermediate data store (for chunked Uploads) now is only in-memory
• Server extensions are supported:
  • creation extension -- upload creation
  • creation-defer-length -- upload creation without size. Its size is set on the first data transfer
  • creation-with-upload -- upload creation and data transferring in one HTTP request
  • expiration -- parsing the upload expiration info
  • checksum -- data integrity verification for chunked uploads. Many checksum algorithms from Go stdlib are supported
  • checksum-trailer -- data integrity verification for streamed uploads. Checksum hash is calculated for all data in stream and is put to HTTP trailer
  • termination -- deleting uploads from server
  • concatenation -- merge finished uploads into one
  • concatenation-unfinished -- merge unfinished uploads (data streams) into one upload

Installation

go get github.com/bdragon300/tusgo

Go v1.18 or newer is required

Examples

Minimal file transfer example

package main

import (
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"
)
import "github.com/bdragon300/tusgo"

func main() {
	baseURL, _ := url.Parse("http://example.com/files")
	cl := tusgo.NewClient(http.DefaultClient, baseURL)

	// Assume that the Upload has been created on server earlier with size 1KiB
	u := tusgo.Upload{Location: "http://example.com/files/foo/bar", RemoteSize: 1024 * 1024}
	// Open a file we want to upload
	f, err := os.Open("/tmp/file.txt")
	if err != nil {
		panic(err)
	}
	defer f.Close()

	s := tusgo.NewUploadStream(cl, &u)
	// Set stream and file pointers to be equal to the remote pointer
	if _, err = s.Sync(); err != nil {
		panic(err)
	}
	if _, err = f.Seek(s.Tell(), io.SeekStart); err != nil {
		panic(err)
	}
	
	written, err := io.Copy(s, f)
	if err != nil {
		panic(fmt.Sprintf("Written %d bytes, error: %s, last response: %v", written, err, s.LastResponse))
	}
	fmt.Printf("Written %d bytes\n", written)
}

Create an Upload and transfer the file with retrying on error

package main

import (
	"errors"
	"io"
	"net"
	"net/http"
	"net/url"
	"os"
	"time"
)
import "github.com/bdragon300/tusgo"

func UploadWithRetry(dst *tusgo.UploadStream, src *os.File) error {
	// Set stream and file pointer to be equal to the remote pointer
	// (if we resume the upload that was interrupted earlier)
	if _, err := dst.Sync(); err != nil {
		return err
	}
	if _, err := src.Seek(dst.Tell(), io.SeekStart); err != nil {
		return err
	}

	_, err := io.Copy(dst, src)
	attempts := 10
	for err != nil && attempts > 0 {
		if _, ok := err.(net.Error); !ok && !errors.Is(err, tusgo.ErrChecksumMismatch) {
			return err // Permanent error, no luck
		}
		time.Sleep(5 * time.Second)
		attempts--
		_, err = io.Copy(dst, src) // Try to resume the transfer again
	}
	if attempts == 0 {
		return errors.New("too many attempts to upload the data")
	}
	return nil
}

func CreateUploadFromFile(f *os.File, cl *tusgo.Client) *tusgo.Upload {
	finfo, err := f.Stat()
	if err != nil {
		panic(err)
	}

	u := tusgo.Upload{}
	if _, err = cl.CreateUpload(&u, finfo.Size(), false, nil); err != nil {
		panic(err)
	}
	return &u
}

func main() {
	baseURL, _ := url.Parse("http://example.com/files")
	cl := tusgo.NewClient(http.DefaultClient, baseURL)

	f, err := os.Open("/tmp/file.txt")
	if err != nil {
		panic(err)
	}
	defer f.Close()
	u := CreateUploadFromFile(f, cl)

	stream := tusgo.NewUploadStream(cl, u)
	if err = UploadWithRetry(stream, f); err != nil {
		panic(err)
	}
}