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webdav: nextcloud: implement backoff and retry for 423 LOCKED errors 

When uploading chunked files to nextcloud, it gives a 423 error while
it is merging files.

This waits for an exponentially increasing amount of time for it to
clear.

If after we have received a 423 error we receive a 404 error then we
assume all is good as this is what appears to happen in practice.

Fixes #7109
This commit is contained in:
Nick Craig-Wood 2023-09-27 17:48:40 +01:00
parent 23ab6fa3a0
commit 8ffe3e462c
1 changed files with 14 additions and 3 deletions
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17
backend/webdav/chunking.go
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@ -14,21 +14,30 @@ import (
"io"
"net/http"
"path"
"time"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/lib/readers"
"github.com/rclone/rclone/lib/rest"
)
func (f *Fs) shouldRetryChunkMerge(ctx context.Context, resp *http.Response, err error) (bool, error) {
func (f *Fs) shouldRetryChunkMerge(ctx context.Context, resp *http.Response, err error, sleepTime *time.Duration, wasLocked *bool) (bool, error) {
// Not found. Can be returned by NextCloud when merging chunks of an upload.
if resp != nil && resp.StatusCode == 404 {
if *wasLocked {
// Assume a 404 error after we've received a 423 error is actually a success
return false, nil
}
return true, err
}
// 423 LOCKED
if resp != nil && resp.StatusCode == 423 {
return false, fmt.Errorf("merging the uploaded chunks failed with 423 LOCKED. This usually happens when the chunks merging is still in progress on NextCloud, but it may also indicate a failed transfer: %w", err)
*wasLocked = true
fs.Logf(f, "Sleeping for %v to wait for chunks to be merged after 423 error", *sleepTime)
time.Sleep(*sleepTime)
*sleepTime *= 2
return true, fmt.Errorf("merging the uploaded chunks failed with 423 LOCKED. This usually happens when the chunks merging is still in progress on NextCloud, but it may also indicate a failed transfer: %w", err)
}
return f.shouldRetry(ctx, resp, err)
@ -180,9 +189,11 @@ func (o *Object) mergeChunks(ctx context.Context, uploadDir string, options []fs
}
opts.ExtraHeaders = o.extraHeaders(ctx, src)
opts.ExtraHeaders["Destination"] = destinationURL.String()
sleepTime := 5 * time.Second
wasLocked := false
err = o.fs.pacer.Call(func() (bool, error) {
resp, err = o.fs.srv.Call(ctx, &opts)
return o.fs.shouldRetryChunkMerge(ctx, resp, err)
return o.fs.shouldRetryChunkMerge(ctx, resp, err, &sleepTime, &wasLocked)
})
if err != nil {
return fmt.Errorf("finalize chunked upload failed, destinationURL: \"%s\": %w", destinationURL, err)