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package tq
import (
"io"
"os"
"strconv"
"strings"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/lfsapi"
"github.com/git-lfs/git-lfs/v3/tools"
"github.com/git-lfs/git-lfs/v3/tr"
)
const (
TusAdapterName = "tus"
TusVersion = "1.0.0"
)
// Adapter for tus.io protocol resumaable uploads
type tusUploadAdapter struct {
*adapterBase
}
func (a *tusUploadAdapter) WorkerStarting(workerNum int) (interface{}, error) {
return nil, nil
}
func (a *tusUploadAdapter) WorkerEnding(workerNum int, ctx interface{}) {
}
func (a *tusUploadAdapter) DoTransfer(ctx interface{}, t *Transfer, cb ProgressCallback, authOkFunc func()) error {
rel, err := t.Rel("upload")
if err != nil {
return err
}
if rel == nil {
return errors.Errorf(tr.Tr.Get("No upload action for object: %s", t.Oid))
}
// Note not supporting the Creation extension since the batch API generates URLs
// Also not supporting Concatenation to support parallel uploads of chunks; forward only
// 1. Send HEAD request to determine upload start point
// Request must include Tus-Resumable header (version)
a.Trace("xfer: sending tus.io HEAD request for %q", t.Oid)
req, err := a.newHTTPRequest("HEAD", rel)
if err != nil {
return err
}
req.Header.Set("Tus-Resumable", TusVersion)
res, err := a.doHTTP(t, req)
if err != nil {
return errors.NewRetriableError(err)
}
// Response will contain Upload-Offset if supported
offHdr := res.Header.Get("Upload-Offset")
if len(offHdr) == 0 {
return errors.New(tr.Tr.Get("missing Upload-Offset header from tus.io HEAD response at %q, contact server admin", rel.Href))
}
offset, err := strconv.ParseInt(offHdr, 10, 64)
if err != nil || offset < 0 {
return errors.New(tr.Tr.Get("invalid Upload-Offset value %q in response from tus.io HEAD at %q, contact server admin", offHdr, rel.Href))
}
// Upload-Offset=size means already completed (skip)
// Batch API will probably already detect this, but handle just in case
if offset >= t.Size {
a.Trace("xfer: tus.io HEAD offset %d indicates %q is already fully uploaded, skipping", offset, t.Oid)
advanceCallbackProgress(cb, t, t.Size)
return nil
}
// Open file for uploading
f, err := os.OpenFile(t.Path, os.O_RDONLY, 0644)
if err != nil {
return errors.Wrap(err, tr.Tr.Get("tus.io upload"))
}
defer f.Close()
// Upload-Offset=0 means start from scratch, but still send PATCH
if offset == 0 {
a.Trace("xfer: tus.io uploading %q from start", t.Oid)
} else {
a.Trace("xfer: tus.io resuming upload %q from %d", t.Oid, offset)
advanceCallbackProgress(cb, t, offset)
}
// 2. Send PATCH request with byte start point (even if 0) in Upload-Offset
// Response status must be 204
// Response Upload-Offset must be request Upload-Offset plus sent bytes
// Response may include Upload-Expires header in which case check not passed
a.Trace("xfer: sending tus.io PATCH request for %q", t.Oid)
req, err = a.newHTTPRequest("PATCH", rel)
if err != nil {
return err
}
req.Header.Set("Tus-Resumable", TusVersion)
req.Header.Set("Upload-Offset", strconv.FormatInt(offset, 10))
req.Header.Set("Content-Type", "application/offset+octet-stream")
req.Header.Set("Content-Length", strconv.FormatInt(t.Size-offset, 10))
req.ContentLength = t.Size - offset
// Ensure progress callbacks made while uploading
// Wrap callback to give name context
ccb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
if cb != nil {
return cb(t.Name, totalSize, readSoFar, readSinceLast)
}
return nil
}
var reader lfsapi.ReadSeekCloser = tools.NewBodyWithCallback(f, t.Size, ccb)
reader = newStartCallbackReader(reader, func() error {
// seek to the offset since lfsapi.Client rewinds the body
if _, err := f.Seek(offset, io.SeekCurrent); err != nil {
return err
}
// Signal auth was ok on first read; this frees up other workers to start
if authOkFunc != nil {
authOkFunc()
}
return nil
})
req.Body = reader
req = a.apiClient.LogRequest(req, "lfs.data.upload")
res, err = a.doHTTP(t, req)
if err != nil {
return errors.NewRetriableError(err)
}
// A status code of 403 likely means that an authentication token for the
// upload has expired. This can be safely retried.
if res.StatusCode == 403 {
err = errors.New(tr.Tr.Get("Received status %d", res.StatusCode))
return errors.NewRetriableError(err)
}
if res.StatusCode > 299 {
return errors.Wrapf(nil, tr.Tr.Get("Invalid status for %s %s: %d",
req.Method,
strings.SplitN(req.URL.String(), "?", 2)[0],
res.StatusCode,
))
}
io.Copy(io.Discard, res.Body)
res.Body.Close()
return verifyUpload(a.apiClient, a.remote, t)
}
func configureTusAdapter(m *concreteManifest) {
m.RegisterNewAdapterFunc(TusAdapterName, Upload, func(name string, dir Direction) Adapter {
switch dir {
case Upload:
bu := &tusUploadAdapter{newAdapterBase(m.fs, name, dir, nil)}
// self implements impl
bu.transferImpl = bu
return bu
case Download:
panic(tr.Tr.Get("Should never ask this function to download"))
}
return nil
})
}
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