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Fix listPathRaw/WalkDir cancelation (#11905)

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In #11888 we observe a lot of running, WalkDir calls.

There doesn't appear to be any listerners for these calls, so they should be aborted.

Ensure that WalkDir aborts when upstream cancels the request.

Fixes #11888
This commit is contained in:
Klaus Post 2021-03-26 19:18:30 +01:00 committed by GitHub
parent 8d5456c15a
commit 9efcb9e15c
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 28 additions and 1 deletions
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10
cmd/common-main.go
View File

@ -428,3 +428,13 @@ func getTLSConfig() (x509Certs []*x509.Certificate, manager *certs.Manager, secu
secureConn = true
return x509Certs, manager, secureConn, nil
}
// contextCanceled returns whether a context is canceled.
func contextCanceled(ctx context.Context) bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}

10
cmd/metacache-set.go
View File

@ -811,6 +811,9 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
if len(disks) == 0 {
return fmt.Errorf("listPathRaw: 0 drives provided")
}
// Cancel upstream if we finish before we expect.
ctx, cancel := context.WithCancel(ctx)
defer cancel()
askDisks := len(disks)
readers := make([]*metacacheReader, askDisks)
@ -821,6 +824,8 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
if err != nil {
return err
}
// Make sure we close the pipe so blocked writes doesn't stay around.
defer r.CloseWithError(context.Canceled)
// Send request to each disk.
go func() {
werr := d.WalkDir(ctx, WalkDirOptions{
@ -832,7 +837,10 @@ func listPathRaw(ctx context.Context, opts listPathRawOptions) (err error) {
ForwardTo: opts.forwardTo,
}, w)
w.CloseWithError(werr)
if werr != io.EOF && werr != nil && werr.Error() != errFileNotFound.Error() && werr.Error() != errVolumeNotFound.Error() {
if werr != io.EOF && werr != nil &&
werr.Error() != errFileNotFound.Error() &&
werr.Error() != errVolumeNotFound.Error() &&
!errors.Is(werr, context.Canceled) {
logger.LogIf(ctx, werr)
}
}()

9
cmd/metacache-walk.go
View File

@ -107,6 +107,9 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
forward := opts.ForwardTo
var scanDir func(path string) error
scanDir = func(current string) error {
if contextCanceled(ctx) {
return ctx.Err()
}
entries, err := s.ListDir(ctx, opts.Bucket, current, -1)
if err != nil {
// Folder could have gone away in-between
@ -142,6 +145,9 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
// Do do not retain the file.
entries[i] = ""
if contextCanceled(ctx) {
return ctx.Err()
}
// If root was an object return it as such.
if HasSuffix(entry, xlStorageFormatFile) {
var meta metaCacheEntry
@ -183,6 +189,9 @@ func (s *xlStorage) WalkDir(ctx context.Context, opts WalkDirOptions, wr io.Writ
if entry == "" {
continue
}
if contextCanceled(ctx) {
return ctx.Err()
}
meta := metaCacheEntry{name: PathJoin(current, entry)}
// If directory entry on stack before this, pop it now.