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Use only one Swift container for both files and manifests

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Signed-off-by: Sylvain Baubeau <sbaubeau@redhat.com>
This commit is contained in:
Sylvain Baubeau 2015-06-19 16:44:55 +02:00
parent a1ae7f7122
commit 9ab55eae39
1 changed files with 81 additions and 69 deletions
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122
docs/storage/driver/swift/swift.go
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@ -156,10 +156,6 @@ func New(params DriverParameters) (*Driver, error) {
return nil, fmt.Errorf("Failed to create container %s (%s)", params.Container, err)
}
if err := ct.ContainerCreate(params.Container+"_segments", nil); err != nil {
return nil, fmt.Errorf("Failed to create container %s (%s)", params.Container+"_segments", err)
}
d := &driver{
Conn: ct,
Container: params.Container,
@ -231,8 +227,8 @@ func (d *driver) ReadStream(ctx context.Context, path string, offset int64) (io.
func (d *driver) WriteStream(ctx context.Context, path string, offset int64, reader io.Reader) (int64, error) {
var (
segments []swift.Object
multi io.Reader
paddingReader io.Reader
bytesRead int64
currentLength int64
cursor int64
)
@ -240,10 +236,9 @@ func (d *driver) WriteStream(ctx context.Context, path string, offset int64, rea
partNumber := 1
chunkSize := int64(d.ChunkSize)
zeroBuf := make([]byte, d.ChunkSize)
segmentsContainer := d.getSegmentsContainer()
getSegment := func() string {
return d.swiftPath(path) + "/" + fmt.Sprintf("%016d", partNumber)
return d.swiftSegmentPath(path) + "/" + fmt.Sprintf("%016d", partNumber)
}
max := func(a int64, b int64) int64 {
@ -258,22 +253,22 @@ func (d *driver) WriteStream(ctx context.Context, path string, offset int64, rea
if swiftErr, ok := err.(*swift.Error); ok && swiftErr.StatusCode == 404 {
// Create a object manifest
if err := d.createParentFolders(path); err != nil {
return bytesRead, err
return 0, err
}
manifest, err := d.createManifest(path)
if err != nil {
return bytesRead, parseError(path, err)
return 0, parseError(path, err)
}
manifest.Close()
} else {
return bytesRead, parseError(path, err)
return 0, parseError(path, err)
}
} else {
// The manifest already exists. Get all the segments
currentLength = info.Bytes
segments, err = d.getAllSegments(segmentsContainer, path)
segments, err = d.getAllSegments(path)
if err != nil {
return bytesRead, parseError(path, err)
return 0, parseError(path, err)
}
}
@ -291,7 +286,7 @@ func (d *driver) WriteStream(ctx context.Context, path string, offset int64, rea
if offset >= currentLength {
for offset-currentLength >= chunkSize {
// Insert a block a zero
d.Conn.ObjectPut(segmentsContainer, getSegment(),
d.Conn.ObjectPut(d.Container, getSegment(),
bytes.NewReader(zeroBuf), false, "",
d.getContentType(), nil)
currentLength += chunkSize
@ -303,26 +298,34 @@ func (d *driver) WriteStream(ctx context.Context, path string, offset int64, rea
} else {
// Offset is inside the current segment : we need to read the
// data from the beginning of the segment to offset
paddingReader, _, err = d.Conn.ObjectOpen(segmentsContainer, getSegment(), false, nil)
file, _, err := d.Conn.ObjectOpen(d.Container, getSegment(), false, nil)
defer file.Close()
paddingReader = file
if err != nil {
return bytesRead, parseError(getSegment(), err)
return 0, parseError(getSegment(), err)
}
}
multi := io.MultiReader(
multi = io.MultiReader(
io.LimitReader(paddingReader, offset-cursor),
io.LimitReader(reader, chunkSize-(offset-cursor)),
)
for {
currentSegment, err := d.Conn.ObjectCreate(segmentsContainer, getSegment(), false, "", d.getContentType(), nil)
writeSegment := func(segment string) (finished bool, bytesRead int64, err error) {
currentSegment, err := d.Conn.ObjectCreate(d.Container, segment, false, "", d.getContentType(), nil)
if err != nil {
return bytesRead, parseError(path, err)
return false, bytesRead, parseError(path, err)
}
n, err := io.Copy(currentSegment, multi)
if err != nil {
return bytesRead, parseError(path, err)
return false, bytesRead, parseError(path, err)
}
if n > 0 {
defer currentSegment.Close()
bytesRead += n - max(0, offset-cursor)
}
if n < chunkSize {
@ -333,25 +336,39 @@ func (d *driver) WriteStream(ctx context.Context, path string, offset int64, rea
headers["Range"] = "bytes=" + strconv.FormatInt(cursor+n, 10) + "-" + strconv.FormatInt(cursor+chunkSize, 10)
file, _, err := d.Conn.ObjectOpen(d.Container, d.swiftPath(path), false, headers)
if err != nil {
return bytesRead, parseError(path, err)
}
if _, err := io.Copy(currentSegment, file); err != nil {
return bytesRead, parseError(path, err)
}
file.Close()
}
if n > 0 {
currentSegment.Close()
bytesRead += n - max(0, offset-cursor)
}
break
return false, bytesRead, parseError(path, err)
}
currentSegment.Close()
bytesRead += n - max(0, offset-cursor)
multi = io.MultiReader(io.LimitReader(reader, chunkSize))
_, copyErr := io.Copy(currentSegment, file)
if err := file.Close(); err != nil {
return false, bytesRead, parseError(path, err)
}
if copyErr != nil {
return false, bytesRead, parseError(path, copyErr)
}
}
return true, bytesRead, nil
}
multi = io.LimitReader(reader, chunkSize)
cursor += chunkSize
partNumber++
return false, bytesRead, nil
}
finished := false
read := int64(0)
bytesRead := int64(0)
for finished == false {
finished, read, err = writeSegment(getSegment())
bytesRead += read
if err != nil {
return bytesRead, err
}
}
return bytesRead, nil
@ -392,7 +409,7 @@ func (d *driver) List(ctx context.Context, path string) ([]string, error) {
objects, err := d.Conn.Objects(d.Container, opts)
for _, obj := range objects {
if !obj.PseudoDirectory {
files = append(files, "/"+strings.TrimSuffix(obj.Name, "/"))
files = append(files, strings.TrimPrefix(strings.TrimSuffix(obj.Name, "/"), d.swiftPath("/")))
}
}
@ -425,23 +442,19 @@ func (d *driver) Delete(ctx context.Context, path string) error {
return storagedriver.PathNotFoundError{Path: path}
}
for index, name := range objects {
objects[index] = name[len(d.Prefix):]
if d.BulkDeleteSupport {
if _, err := d.Conn.BulkDelete(d.Container, objects); err != swift.Forbidden {
return parseError(path, err)
}
}
var multiDelete = true
if d.BulkDeleteSupport {
_, err := d.Conn.BulkDelete(d.Container, objects)
multiDelete = err != nil
}
if multiDelete {
for _, name := range objects {
if _, headers, err := d.Conn.Object(d.Container, name); err == nil {
manifest, ok := headers["X-Object-Manifest"]
if ok {
components := strings.SplitN(manifest, "/", 2)
segContainer := components[0]
segments, err := d.getAllSegments(segContainer, components[1])
segments, err := d.getAllSegments(components[1])
if err != nil {
return parseError(name, err)
}
@ -460,7 +473,6 @@ func (d *driver) Delete(ctx context.Context, path string) error {
return parseError(name, err)
}
}
}
return nil
}
@ -472,14 +484,18 @@ func (d *driver) URLFor(ctx context.Context, path string, options map[string]int
}
func (d *driver) swiftPath(path string) string {
return strings.TrimLeft(strings.TrimRight(d.Prefix, "/")+path, "/")
return strings.TrimLeft(strings.TrimRight(d.Prefix+"/files"+path, "/"), "/")
}
func (d *driver) swiftSegmentPath(path string) string {
return strings.TrimLeft(strings.TrimRight(d.Prefix+"/segments"+path, "/"), "/")
}
func (d *driver) createParentFolders(path string) error {
dir := gopath.Dir(path)
for dir != "/" {
_, _, err := d.Conn.Object(d.Container, d.swiftPath(dir))
if swiftErr, ok := err.(*swift.Error); ok && swiftErr.StatusCode == 404 {
if err == swift.ContainerNotFound || err == swift.ObjectNotFound {
_, err := d.Conn.ObjectPut(d.Container, d.swiftPath(dir), bytes.NewReader(make([]byte, 0)),
false, "", directoryMimeType, nil)
if err != nil {
@ -496,17 +512,13 @@ func (d *driver) getContentType() string {
return "application/octet-stream"
}
func (d *driver) getSegmentsContainer() string {
return d.Container + "_segments"
}
func (d *driver) getAllSegments(container string, path string) ([]swift.Object, error) {
return d.Conn.Objects(container, &swift.ObjectsOpts{Prefix: d.swiftPath(path)})
func (d *driver) getAllSegments(path string) ([]swift.Object, error) {
return d.Conn.Objects(d.Container, &swift.ObjectsOpts{Prefix: d.swiftSegmentPath(path)})
}
func (d *driver) createManifest(path string) (*swift.ObjectCreateFile, error) {
headers := make(swift.Headers)
headers["X-Object-Manifest"] = d.getSegmentsContainer() + "/" + d.swiftPath(path)
headers["X-Object-Manifest"] = d.Container + "/" + d.swiftSegmentPath(path)
return d.Conn.ObjectCreate(d.Container, d.swiftPath(path), false, "",
d.getContentType(), headers)
}