dropbox: add polling support - fixes #2949
This implements polling support for the Dropbox backend. The Dropbox SDK dependency had to be updated due to an auth issue, which was fixed on Jan 12 2021. A secondary internal Dropbox service was created to handle unauthorized SDK requests, as is necessary when using the ListFolderLongpoll function/endpoint. The config variable was renamed to cfg to avoid potential conflicts with the imported config package.
This commit is contained in:
Robert Thomas
GitHub
parent
f6265fbeff
commit
e5aa92c922
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@ -219,11 +219,11 @@ shared folder.`,
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// as invalid characters.
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// Testing revealed names with trailing spaces and the DEL character don't work.
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// Also encode invalid UTF-8 bytes as json doesn't handle them properly.
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Default: (encoder.Base |
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Default: encoder.Base |
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encoder.EncodeBackSlash |
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encoder.EncodeDel |
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encoder.EncodeRightSpace |
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encoder.EncodeInvalidUtf8),
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encoder.EncodeInvalidUtf8,
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}}...),
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})
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}
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@ -242,8 +242,10 @@ type Fs struct {
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name string // name of this remote
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root string // the path we are working on
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opt Options // parsed options
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ci *fs.ConfigInfo // global config
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features *fs.Features // optional features
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srv files.Client // the connection to the dropbox server
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svc files.Client // the connection to the dropbox server (unauthorized)
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sharing sharing.Client // as above, but for generating sharing links
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users users.Client // as above, but for accessing user information
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team team.Client // for the Teams API
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@ -367,22 +369,29 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
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return nil, errors.Wrap(err, "failed to configure dropbox")
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}
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ci := fs.GetConfig(ctx)
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f := &Fs{
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name: name,
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opt: *opt,
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ci: ci,
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pacer: fs.NewPacer(ctx, pacer.NewDefault(pacer.MinSleep(minSleep), pacer.MaxSleep(maxSleep), pacer.DecayConstant(decayConstant))),
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}
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config := dropbox.Config{
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cfg := dropbox.Config{
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LogLevel: dropbox.LogOff, // logging in the SDK: LogOff, LogDebug, LogInfo
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Client: oAuthClient, // maybe???
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HeaderGenerator: f.headerGenerator,
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}
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// unauthorized config for endpoints that fail with auth
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ucfg := dropbox.Config{
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LogLevel: dropbox.LogOff, // logging in the SDK: LogOff, LogDebug, LogInfo
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}
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// NOTE: needs to be created pre-impersonation so we can look up the impersonated user
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f.team = team.New(config)
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f.team = team.New(cfg)
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if opt.Impersonate != "" {
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user := team.UserSelectorArg{
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Email: opt.Impersonate,
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}
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@ -397,12 +406,13 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
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return nil, errors.Wrapf(err, "invalid dropbox team member: %q", opt.Impersonate)
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}
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config.AsMemberID = memberIds[0].MemberInfo.Profile.MemberProfile.TeamMemberId
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cfg.AsMemberID = memberIds[0].MemberInfo.Profile.MemberProfile.TeamMemberId
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}
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f.srv = files.New(config)
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f.sharing = sharing.New(config)
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f.users = users.New(config)
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f.srv = files.New(cfg)
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f.svc = files.New(ucfg)
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f.sharing = sharing.New(cfg)
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f.users = users.New(cfg)
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f.features = (&fs.Features{
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CaseInsensitive: true,
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ReadMimeType: false,
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@ -661,7 +671,7 @@ func (f *Fs) findSharedFolder(name string) (id string, err error) {
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return "", fs.ErrorDirNotFound
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}
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// mountSharedFolders mount a shared folder to the root namespace
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// mountSharedFolder mount a shared folder to the root namespace
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func (f *Fs) mountSharedFolder(id string) error {
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arg := sharing.MountFolderArg{
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SharedFolderId: id,
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@ -673,7 +683,7 @@ func (f *Fs) mountSharedFolder(id string) error {
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return err
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}
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// listSharedFolders lists shared the user as access to (note this means individual
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// listReceivedFiles lists shared the user as access to (note this means individual
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// files not files contained in shared folders)
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func (f *Fs) listReceivedFiles() (entries fs.DirEntries, err error) {
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started := false
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@ -1191,6 +1201,144 @@ func (f *Fs) About(ctx context.Context) (usage *fs.Usage, err error) {
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return usage, nil
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}
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// ChangeNotify calls the passed function with a path that has had changes.
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// If the implementation uses polling, it should adhere to the given interval.
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//
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// Automatically restarts itself in case of unexpected behavior of the remote.
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//
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// Close the returned channel to stop being notified.
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func (f *Fs) ChangeNotify(ctx context.Context, notifyFunc func(string, fs.EntryType), pollIntervalChan <-chan time.Duration) {
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go func() {
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// get the StartCursor early so all changes from now on get processed
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startCursor, err := f.changeNotifyCursor()
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if err != nil {
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fs.Infof(f, "Failed to get StartCursor: %s", err)
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}
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var ticker *time.Ticker
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var tickerC <-chan time.Time
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for {
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select {
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case pollInterval, ok := <-pollIntervalChan:
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if !ok {
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if ticker != nil {
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ticker.Stop()
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}
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return
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}
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if ticker != nil {
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ticker.Stop()
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ticker, tickerC = nil, nil
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}
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if pollInterval != 0 {
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ticker = time.NewTicker(pollInterval)
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tickerC = ticker.C
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}
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case <-tickerC:
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if startCursor == "" {
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startCursor, err = f.changeNotifyCursor()
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if err != nil {
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fs.Infof(f, "Failed to get StartCursor: %s", err)
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continue
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}
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}
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fs.Debugf(f, "Checking for changes on remote")
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startCursor, err = f.changeNotifyRunner(ctx, notifyFunc, startCursor)
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if err != nil {
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fs.Infof(f, "Change notify listener failure: %s", err)
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}
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}
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}
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}()
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}
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func (f *Fs) changeNotifyCursor() (cursor string, err error) {
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var startCursor *files.ListFolderGetLatestCursorResult
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err = f.pacer.Call(func() (bool, error) {
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startCursor, err = f.srv.ListFolderGetLatestCursor(&files.ListFolderArg{Path: f.opt.Enc.FromStandardPath(f.slashRoot), Recursive: true})
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return shouldRetry(err)
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})
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if err != nil {
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return
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}
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return startCursor.Cursor, nil
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}
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func (f *Fs) changeNotifyRunner(ctx context.Context, notifyFunc func(string, fs.EntryType), startCursor string) (newCursor string, err error) {
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cursor := startCursor
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var res *files.ListFolderLongpollResult
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// Dropbox sets a timeout range of 30 - 480
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timeout := uint64(f.ci.Timeout / time.Second)
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if timeout > 480 {
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timeout = 480
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}
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err = f.pacer.Call(func() (bool, error) {
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args := files.ListFolderLongpollArg{
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Cursor: cursor,
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Timeout: timeout,
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}
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res, err = f.svc.ListFolderLongpoll(&args)
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return shouldRetry(err)
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})
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if err != nil {
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return
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}
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if !res.Changes {
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return cursor, nil
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}
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if res.Backoff != 0 {
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fs.Debugf(f, "Waiting to poll for %d seconds", res.Backoff)
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time.Sleep(time.Duration(res.Backoff) * time.Second)
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}
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for {
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var changeList *files.ListFolderResult
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arg := files.ListFolderContinueArg{
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Cursor: cursor,
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}
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err = f.pacer.Call(func() (bool, error) {
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changeList, err = f.srv.ListFolderContinue(&arg)
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return shouldRetry(err)
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})
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if err != nil {
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return "", errors.Wrap(err, "list continue")
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}
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cursor = changeList.Cursor
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var entryType fs.EntryType
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for _, entry := range changeList.Entries {
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entryPath := ""
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switch info := entry.(type) {
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case *files.FolderMetadata:
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entryType = fs.EntryDirectory
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entryPath = strings.TrimLeft(info.PathDisplay, f.slashRootSlash)
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case *files.FileMetadata:
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entryType = fs.EntryObject
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entryPath = strings.TrimLeft(info.PathDisplay, f.slashRootSlash)
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case *files.DeletedMetadata:
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entryType = fs.EntryObject
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entryPath = strings.TrimLeft(info.PathDisplay, f.slashRootSlash)
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default:
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fs.Errorf(entry, "dropbox ChangeNotify: ignoring unknown EntryType %T", entry)
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continue
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}
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if entryPath != "" {
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notifyFunc(entryPath, entryType)
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}
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}
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if !changeList.HasMore {
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break
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}
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}
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return cursor, nil
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}
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// Hashes returns the supported hash sets.
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func (f *Fs) Hashes() hash.Set {
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return hash.Set(DbHashType)
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2
go.mod
2
go.mod
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@ -23,7 +23,7 @@ require (
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github.com/colinmarc/hdfs/v2 v2.2.0
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github.com/coreos/go-semver v0.3.0
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github.com/dop251/scsu v0.0.0-20200422003335-8fadfb689669
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github.com/dropbox/dropbox-sdk-go-unofficial v5.6.0+incompatible
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github.com/dropbox/dropbox-sdk-go-unofficial v1.0.1-0.20210114204226-41fdcdae8a53
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github.com/gabriel-vasile/mimetype v1.1.2
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github.com/gogo/protobuf v1.3.2 // indirect
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github.com/google/go-querystring v1.0.0 // indirect
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5
go.sum
5
go.sum
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@ -175,8 +175,8 @@ github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8
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github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
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github.com/dop251/scsu v0.0.0-20200422003335-8fadfb689669 h1:e28M2/odOZjMc1J2ZZwgex6NM9+aqr1nMlTqPLayxbk=
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github.com/dop251/scsu v0.0.0-20200422003335-8fadfb689669/go.mod h1:Gth7Xev0h28tuTayG4HlTZy90IXhiDgV2+MLtJzjpP0=
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github.com/dropbox/dropbox-sdk-go-unofficial v5.6.0+incompatible h1:DtumzkLk2zZ2SeElEr+VNz+zV7l+BTe509cV4sKPXbM=
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github.com/dropbox/dropbox-sdk-go-unofficial v5.6.0+incompatible/go.mod h1:lr+LhMM3F6Y3lW1T9j2U5l7QeuWm87N9+PPXo3yH4qY=
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github.com/dropbox/dropbox-sdk-go-unofficial v1.0.1-0.20210114204226-41fdcdae8a53 h1:HQ0F1AdtiOOtx4fv1bYYOBTrwQwxJh2tCWouwmvUjyo=
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github.com/dropbox/dropbox-sdk-go-unofficial v1.0.1-0.20210114204226-41fdcdae8a53/go.mod h1:6zG+Yst2Q7BA8rp69tmHlCnt7BxeCyj3rno0B7hYq8k=
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github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
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github.com/dustin/go-humanize v0.0.0-20180421182945-02af3965c54e/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
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github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
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@ -816,6 +816,7 @@ golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwY
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golang.org/x/net v0.0.0-20201031054903-ff519b6c9102/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
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golang.org/x/net v0.0.0-20201209123823-ac852fbbde11/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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golang.org/x/net v0.0.0-20210119194325-5f4716e94777 h1:003p0dJM77cxMSyCPFphvZf/Y5/NXf5fzg6ufd1/Oew=
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golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
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