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b2: implement SetModTime #3210

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SetModTime() is implemented by copying an object onto itself and
updating the metadata in the process.
This commit is contained in:
Nick Craig-Wood
2019-05-24 16:07:22 +01:00
parent a5bed67016
commit 22368b997c
2 changed files with 52 additions and 22 deletions
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67
backend/b2/b2.go
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@@ -1206,17 +1206,8 @@ func (o *Object) decodeMetaDataFileInfo(info *api.FileInfo) (err error) {
return o.decodeMetaDataRaw(info.ID, info.SHA1, info.Size, info.UploadTimestamp, info.Info, info.ContentType)
}
// readMetaData gets the metadata if it hasn't already been fetched
//
// Sets
// o.id
// o.modTime
// o.size
// o.sha1
func (o *Object) readMetaData() (err error) {
if o.id != "" {
return nil
}
// getMetaData gets the metadata from the object unconditionally
func (o *Object) getMetaData() (info *api.File, err error) {
maxSearched := 1
var timestamp api.Timestamp
baseRemote := o.remote
@@ -1224,7 +1215,6 @@ func (o *Object) readMetaData() (err error) {
timestamp, baseRemote = api.RemoveVersion(baseRemote)
maxSearched = maxVersions
}
var info *api.File
err = o.fs.list("", true, baseRemote, maxSearched, o.fs.opt.Versions, func(remote string, object *api.File, isDirectory bool) error {
if isDirectory {
return nil
@@ -1239,12 +1229,30 @@ func (o *Object) readMetaData() (err error) {
})
if err != nil {
if err == fs.ErrorDirNotFound {
return fs.ErrorObjectNotFound
return nil, fs.ErrorObjectNotFound
}
return err
return nil, err
}
if info == nil {
return fs.ErrorObjectNotFound
return nil, fs.ErrorObjectNotFound
}
return info, nil
}
// readMetaData gets the metadata if it hasn't already been fetched
//
// Sets
// o.id
// o.modTime
// o.size
// o.sha1
func (o *Object) readMetaData() (err error) {
if o.id != "" {
return nil
}
info, err := o.getMetaData()
if err != nil {
return err
}
return o.decodeMetaData(info)
}
@@ -1283,10 +1291,33 @@ func (o *Object) ModTime() (result time.Time) {
return o.modTime
}
// SetModTime sets the modification time of the local fs object
// SetModTime sets the modification time of the Object
func (o *Object) SetModTime(modTime time.Time) error {
// Not possible with B2
return fs.ErrorCantSetModTime
info, err := o.getMetaData()
if err != nil {
return err
}
info.Info[timeKey] = timeString(modTime)
opts := rest.Opts{
Method: "POST",
Path: "/b2_copy_file",
}
var request = api.CopyFileRequest{
SourceID: o.id,
Name: o.fs.root + o.remote, // copy to same name
MetadataDirective: "REPLACE",
ContentType: info.ContentType,
Info: info.Info,
}
var response api.FileInfo
err = o.fs.pacer.Call(func() (bool, error) {
resp, err := o.fs.srv.CallJSON(&opts, &request, &response)
return o.fs.shouldRetry(resp, err)
})
if err != nil {
return err
}
return o.decodeMetaDataFileInfo(&response)
}
// Storable returns if this object is storable