/
main.go
218 lines (174 loc) · 4.97 KB
/
main.go
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package main
import (
"context"
"errors"
"flag"
"fmt"
"io"
"log"
"net/http"
"net/http/httptrace"
"net/textproto"
"os"
"strconv"
"strings"
)
const InteropVersion = "5"
var endpoint string
var filepath string
var stateFile string
func main() {
flag.StringVar(&endpoint, "endpoint", "http://localhost:8080/", "")
flag.StringVar(&filepath, "file", "", "")
flag.StringVar(&stateFile, "state", "./upload-state.txt", "")
flag.Parse()
if filepath == "" {
log.Fatalln("Please specify an input file using the --file option")
}
file, err := os.Open(filepath)
if err != nil {
log.Fatalf("failed to open input file: %s", err)
}
fileInfo, err := file.Stat()
if err != nil {
log.Fatalf("failed to get file info: %s", err)
}
uploadUrl, ok, err := loadUploadState()
if err != nil {
log.Fatalf("failed to load upload state: %s", err)
}
var response string
if !ok {
// No upload state found, so we start a fresh upload with the
response, err = uploadCreationProcedure(file)
if err != nil {
log.Fatalf("upload creation procedure failed: %s", err)
}
} else {
offset, err := offsetRetrievingProcedure(uploadUrl)
if err != nil {
log.Fatalf("offset retrieving procedure failed: %s", err)
}
log.Printf("Upload offset is: %d", offset)
if offset == fileInfo.Size() {
log.Printf("File is completely uploaded at: %s\n", uploadUrl)
return
}
if _, err := file.Seek(offset, os.SEEK_SET); err != nil {
log.Fatalf("failed to seek to offset: %s", err)
}
response, err = uploadAppendingProcedure(uploadUrl, file, offset)
if err != nil {
log.Fatalf("upload creation procedure failed: %s", err)
}
}
log.Println("Response from server is:")
fmt.Println(response)
}
func loadUploadState() (uploadUrl string, ok bool, err error) {
content, err := os.ReadFile(stateFile)
if errors.Is(err, os.ErrNotExist) {
ok = false
err = nil
return
}
if err != nil {
return "", false, err
}
uploadUrl = strings.TrimSpace(string(content))
ok = uploadUrl != ""
return
}
func saveUploadState(uploadUrl string) error {
return os.WriteFile(stateFile, []byte(uploadUrl), 0o644)
}
func uploadCreationProcedure(file *os.File) (string, error) {
ctx := context.Background()
ctx = httptrace.WithClientTrace(ctx, &httptrace.ClientTrace{
Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
if code != 104 {
return nil
}
if header.Get("Upload-Draft-Interop-Version") != InteropVersion {
log.Printf("Received mismatching interop version for 1xx response. Ignoring it.")
return nil
}
uploadOffset := header.Get("Upload-Offset")
if uploadOffset != "" {
log.Printf("Received 104 response. Server reported to have saved %s bytes\n", uploadOffset)
}
uploadUrl := header.Get("Location")
if uploadUrl != "" {
log.Printf("Received 104 response. Location is: %s\n", uploadUrl)
if err := saveUploadState(uploadUrl); err != nil {
log.Printf("failed to write upload state file: %s", err)
}
}
return nil
},
})
req, err := http.NewRequestWithContext(ctx, "POST", endpoint, file)
req.Header.Set("Upload-Draft-Interop-Version", InteropVersion)
req.Header.Set("Upload-Complete", "?1")
if err != nil {
return "", err
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer res.Body.Close()
if res.StatusCode < 200 || res.StatusCode > 299 {
return "", fmt.Errorf("unexpected status code: %d", res.StatusCode)
}
uploadUrl := res.Header.Get("Location")
log.Printf("File is completely uploaded at: %s\n", uploadUrl)
response, err := io.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(response), nil
}
func offsetRetrievingProcedure(uploadUrl string) (offset int64, err error) {
req, err := http.NewRequest("HEAD", uploadUrl, nil)
req.Header.Set("Upload-Draft-Interop-Version", InteropVersion)
if err != nil {
return 0, err
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return 0, err
}
defer res.Body.Close()
if res.StatusCode < 200 || res.StatusCode > 299 {
return 0, fmt.Errorf("unexpected status code: %d", res.StatusCode)
}
offset, err = strconv.ParseInt(res.Header.Get("Upload-Offset"), 10, 64)
if err != nil {
return 0, fmt.Errorf("failed to parse upload-offset header: %s", err)
}
return
}
func uploadAppendingProcedure(uploadUrl string, file *os.File, offset int64) (string, error) {
req, err := http.NewRequest("PATCH", uploadUrl, file)
req.Header.Set("Upload-Draft-Interop-Version", InteropVersion)
req.Header.Set("Upload-Offset", strconv.FormatInt(offset, 10))
req.Header.Set("Upload-Complete", "?1")
if err != nil {
return "", err
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return "", err
}
defer res.Body.Close()
if res.StatusCode < 200 || res.StatusCode > 299 {
return "", fmt.Errorf("unexpected status code: %d", res.StatusCode)
}
log.Printf("File is completely uploaded at: %s\n", uploadUrl)
response, err := io.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(response), nil
}