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swift: ignore directory marker objects where appropriate - fixes #190

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* When creating a LimitedFs
  * When calling List() to list files
  * In the Storable() method
  * Add a Purge() method to delete the directory marker objects too

This is a partial fix for #172
This commit is contained in:
Nick Craig-Wood 2015-11-07 15:17:46 +00:00
parent ef54167a4a
commit 5df04cb763
1 changed files with 45 additions and 13 deletions
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56
swift/swift.go
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@ -17,6 +17,12 @@ import (
"github.com/spf13/pflag"
)
// Constants
const (
directoryMarkerContentType = "application/directory" // content type of directory marker objects
directoryMarkerMaxSize = 1 // max size that directory marker objects can be
)
// Globals
var (
chunkSize = fs.SizeSuffix(5 * 1024 * 1024 * 1024)
@ -173,9 +179,9 @@ func NewFs(name, root string) (fs.Fs, error) {
}
if f.root != "" {
f.root += "/"
// Check to see if the object exists
_, _, err = f.c.Object(container, directory)
if err == nil {
// Check to see if the object exists - ignore directory markers
_, headers, err := f.c.Object(container, directory)
if err == nil && headers["Content-Type"] != directoryMarkerContentType {
remote := path.Base(directory)
f.root = path.Dir(directory)
if f.root == "." {
@ -274,8 +280,10 @@ func (f *Fs) list(directories bool, fn listFn) {
}
}
// List walks the path returning a channel of FsObjects
func (f *Fs) List() fs.ObjectsChan {
// listFiles walks the path returning a channel of FsObjects
//
// if ignoreStorable is set then it outputs the file even if Storable() is false
func (f *Fs) listFiles(ignoreStorable bool) fs.ObjectsChan {
out := make(fs.ObjectsChan, fs.Config.Checkers)
if f.container == "" {
// Return no objects at top level list
@ -288,15 +296,12 @@ func (f *Fs) List() fs.ObjectsChan {
defer close(out)
f.list(false, func(remote string, object *swift.Object) error {
if o := f.newFsObjectWithInfo(remote, object); o != nil {
// Do full metadata read on 0 size objects which might be manifest files
if o.Size() == 0 {
err := o.(*Object).readMetaData()
if err != nil {
fs.Debug(o, "Failed to read metadata: %v", err)
}
}
// Storable does a full metadata read on 0 size objects which might be manifest files
storable := o.Storable()
if storable || ignoreStorable {
out <- o
}
}
return nil
})
}()
@ -304,6 +309,11 @@ func (f *Fs) List() fs.ObjectsChan {
return out
}
// List walks the path returning a channel of FsObjects
func (f *Fs) List() fs.ObjectsChan {
return f.listFiles(false)
}
// ListDir lists the containers
func (f *Fs) ListDir() fs.DirChan {
out := make(fs.DirChan, fs.Config.Checkers)
@ -373,6 +383,14 @@ func (f *Fs) Precision() time.Duration {
return time.Nanosecond
}
// Purge deletes all the files and directories
//
// Implemented here so we can make sure we delete directory markers
func (f *Fs) Purge() error {
fs.DeleteFiles(f.listFiles(true))
return f.Rmdir()
}
// Copy src to this remote using server side copy operations.
//
// This is stored with the remote path given
@ -504,9 +522,22 @@ func (o *Object) SetModTime(modTime time.Time) {
}
// Storable returns if this object is storable
//
// It reads the metadata for <= directoryMarkerMaxSize byte objects then compares the
// Content-Type to directoryMarkerContentType - that makes it a
// directory marker which is not storable.
func (o *Object) Storable() bool {
if o.info.Bytes > directoryMarkerMaxSize {
return true
}
err := o.readMetaData()
if err != nil {
fs.Debug(o, "Failed to read metadata: %s", err)
return true
}
contentType := (*o.headers)["Content-Type"]
return contentType != directoryMarkerContentType
}
// Open an object for read
func (o *Object) Open() (in io.ReadCloser, err error) {
@ -647,6 +678,7 @@ func (o *Object) Remove() error {
// Check the interfaces are satisfied
var (
_ fs.Fs = &Fs{}
_ fs.Purger = &Fs{}
_ fs.Copier = &Fs{}
_ fs.Object = &Object{}
)