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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package taildrop
import (
"context"
"errors"
"io"
"io/fs"
"os"
"runtime"
"sort"
"time"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/util/backoff"
"tailscale.com/util/set"
)
// HasFilesWaiting reports whether any files are buffered in [Handler.Dir].
// This always returns false when [Handler.DirectFileMode] is false.
func (m *manager) HasFilesWaiting() bool {
if m == nil || m.opts.fileOps == nil || m.opts.DirectFileMode {
return false
}
// Optimization: this is usually empty, so avoid opening
// the directory and checking. We can't cache the actual
// has-files-or-not values as the macOS/iOS client might
// in the future use+delete the files directly. So only
// keep this negative cache.
total := m.totalReceived.Load()
if total == m.emptySince.Load() {
return false
}
files, err := m.opts.fileOps.ListFiles()
if err != nil {
return false
}
// Build a set of filenames present in Dir
fileSet := set.Of(files...)
for _, filename := range files {
if isPartialOrDeleted(filename) {
continue
}
if fileSet.Contains(filename + deletedSuffix) {
continue // already handled
}
// Found at least one downloadable file
return true
}
// No waiting files → update negative‑result cache
m.emptySince.Store(total)
return false
}
// WaitingFiles returns the list of files that have been sent by a
// peer that are waiting in [Handler.Dir].
// This always returns nil when [Handler.DirectFileMode] is false.
func (m *manager) WaitingFiles() ([]apitype.WaitingFile, error) {
if m == nil || m.opts.fileOps == nil {
return nil, ErrNoTaildrop
}
if m.opts.DirectFileMode {
return nil, nil
}
names, err := m.opts.fileOps.ListFiles()
if err != nil {
return nil, redactError(err)
}
var ret []apitype.WaitingFile
for _, name := range names {
if isPartialOrDeleted(name) {
continue
}
// A corresponding .deleted marker means the file was already handled.
if _, err := m.opts.fileOps.Stat(name + deletedSuffix); err == nil {
continue
}
fi, err := m.opts.fileOps.Stat(name)
if err != nil {
continue
}
ret = append(ret, apitype.WaitingFile{
Name: name,
Size: fi.Size(),
})
}
sort.Slice(ret, func(i, j int) bool { return ret[i].Name < ret[j].Name })
return ret, nil
}
// DeleteFile deletes a file of the given baseName from [Handler.Dir].
// This method is only allowed when [Handler.DirectFileMode] is false.
func (m *manager) DeleteFile(baseName string) error {
if m == nil || m.opts.fileOps == nil {
return ErrNoTaildrop
}
if m.opts.DirectFileMode {
return errors.New("deletes not allowed in direct mode")
}
var bo *backoff.Backoff
logf := m.opts.Logf
t0 := m.opts.Clock.Now()
for {
err := m.opts.fileOps.Remove(baseName)
if err != nil && !os.IsNotExist(err) {
err = redactError(err)
// Put a retry loop around deletes on Windows.
//
// Windows file descriptor closes are effectively asynchronous,
// as a bunch of hooks run on/after close,
// and we can't necessarily delete the file for a while after close,
// as we need to wait for everybody to be done with it.
// On Windows, unlike Unix, a file can't be deleted if it's open anywhere.
// So try a few times but ultimately just leave a "foo.jpg.deleted"
// marker file to note that it's deleted and we clean it up later.
if runtime.GOOS == "windows" {
if bo == nil {
bo = backoff.NewBackoff("delete-retry", logf, 1*time.Second)
}
if m.opts.Clock.Since(t0) < 5*time.Second {
bo.BackOff(context.Background(), err)
continue
}
if err := m.touchFile(baseName + deletedSuffix); err != nil {
logf("peerapi: failed to leave deleted marker: %v", err)
}
m.deleter.Insert(baseName + deletedSuffix)
}
logf("peerapi: failed to DeleteFile: %v", err)
return err
}
return nil
}
}
func (m *manager) touchFile(name string) error {
wc, _, err := m.opts.fileOps.OpenWriter(name /* offset= */, 0, 0666)
if err != nil {
return redactError(err)
}
return wc.Close()
}
// OpenFile opens a file of the given baseName from [Handler.Dir].
// This method is only allowed when [Handler.DirectFileMode] is false.
func (m *manager) OpenFile(baseName string) (rc io.ReadCloser, size int64, err error) {
if m == nil || m.opts.fileOps == nil {
return nil, 0, ErrNoTaildrop
}
if m.opts.DirectFileMode {
return nil, 0, errors.New("opens not allowed in direct mode")
}
if _, err := m.opts.fileOps.Stat(baseName + deletedSuffix); err == nil {
return nil, 0, redactError(&fs.PathError{Op: "open", Path: baseName, Err: fs.ErrNotExist})
}
f, err := m.opts.fileOps.OpenReader(baseName)
if err != nil {
return nil, 0, redactError(err)
}
fi, err := m.opts.fileOps.Stat(baseName)
if err != nil {
f.Close()
return nil, 0, redactError(err)
}
return f, fi.Size(), nil
}
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