Add Openstack Swift storage driver
Signed-off-by: Sylvain Baubeau <sbaubeau@redhat.com>
This commit is contained in:
Sylvain Baubeau
parent
50de6d914c
commit
cce4956131
2 changed files with 660 additions and 0 deletions
519
docs/storage/driver/swift/swift.go
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519
docs/storage/driver/swift/swift.go
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// Package swift provides a storagedriver.StorageDriver implementation to
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// store blobs in Openstack Swift object storage.
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//
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// This package leverages the ncw/swift client library for interfacing with
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// Swift.
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//
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// Because Swift is a key, value store the Stat call does not support last modification
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// time for directories (directories are an abstraction for key, value stores)
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package swift
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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gopath "path"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/lebauce/swift"
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"github.com/docker/distribution/context"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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"github.com/docker/distribution/registry/storage/driver/base"
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"github.com/docker/distribution/registry/storage/driver/factory"
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)
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const driverName = "swift"
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const defaultChunkSize = 5 * 1024 * 1024
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//DriverParameters A struct that encapsulates all of the driver parameters after all values have been set
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type DriverParameters struct {
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Username string
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Password string
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AuthURL string
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Tenant string
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Region string
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Container string
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Prefix string
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ChunkSize int64
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}
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type swiftInfo map[string]interface{}
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func init() {
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factory.Register(driverName, &swiftDriverFactory{})
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}
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// swiftDriverFactory implements the factory.StorageDriverFactory interface
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type swiftDriverFactory struct{}
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func (factory *swiftDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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return FromParameters(parameters)
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}
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type driver struct {
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Conn swift.Connection
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Container string
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Prefix string
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BulkDeleteSupport bool
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ChunkSize int64
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}
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type baseEmbed struct {
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base.Base
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}
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// Driver is a storagedriver.StorageDriver implementation backed by Amazon Swift
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// Objects are stored at absolute keys in the provided bucket.
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type Driver struct {
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baseEmbed
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}
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// FromParameters constructs a new Driver with a given parameters map
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// Required parameters:
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// - username
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// - password
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// - authurl
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// - container
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func FromParameters(parameters map[string]interface{}) (*Driver, error) {
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username, ok := parameters["username"]
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if !ok || fmt.Sprint(username) == "" {
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return nil, fmt.Errorf("No username parameter provided")
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}
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password, ok := parameters["password"]
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if !ok || fmt.Sprint(password) == "" {
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return nil, fmt.Errorf("No password parameter provided")
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}
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authURL, ok := parameters["authurl"]
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if !ok || fmt.Sprint(authURL) == "" {
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return nil, fmt.Errorf("No container parameter provided")
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}
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container, ok := parameters["container"]
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if !ok || fmt.Sprint(container) == "" {
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return nil, fmt.Errorf("No container parameter provided")
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}
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tenant, ok := parameters["tenant"]
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if !ok {
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tenant = ""
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}
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region, ok := parameters["region"]
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if !ok {
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region = ""
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}
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rootDirectory, ok := parameters["rootdirectory"]
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if !ok {
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rootDirectory = ""
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}
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chunkSize := int64(defaultChunkSize)
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chunkSizeParam, ok := parameters["chunksize"]
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if ok {
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chunkSize, ok = chunkSizeParam.(int64)
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if !ok {
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return nil, fmt.Errorf("The chunksize parameter should be a number")
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}
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}
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params := DriverParameters{
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fmt.Sprint(username),
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fmt.Sprint(password),
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fmt.Sprint(authURL),
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fmt.Sprint(tenant),
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fmt.Sprint(region),
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fmt.Sprint(container),
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fmt.Sprint(rootDirectory),
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chunkSize,
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}
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return New(params)
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}
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// New constructs a new Driver with the given Openstack Swift credentials and container name
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func New(params DriverParameters) (*Driver, error) {
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ct := swift.Connection{
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UserName: params.Username,
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ApiKey: params.Password,
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AuthUrl: params.AuthURL,
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Region: params.Region,
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UserAgent: "distribution",
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Tenant: params.Tenant,
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ConnectTimeout: 60 * time.Second,
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Timeout: 15 * 60 * time.Second,
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}
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err := ct.Authenticate()
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if err != nil {
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return nil, fmt.Errorf("Swift authentication failed: %s", err)
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}
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if err := ct.ContainerCreate(params.Container, nil); err != nil {
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return nil, fmt.Errorf("Failed to create container %s (%s)", params.Container, err)
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}
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if err := ct.ContainerCreate(params.Container + "_segments", nil); err != nil {
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return nil, fmt.Errorf("Failed to create container %s (%s)", params.Container + "_segments", err)
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}
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d := &driver{
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Conn: ct,
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Container: params.Container,
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Prefix: params.Prefix,
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BulkDeleteSupport: detectBulkDelete(params.AuthURL),
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ChunkSize: params.ChunkSize,
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}
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return &Driver{
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baseEmbed: baseEmbed{
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Base: base.Base{
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StorageDriver: d,
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},
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},
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}, nil
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}
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// Implement the storagedriver.StorageDriver interface
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func (d *driver) Name() string {
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return driverName
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}
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// GetContent retrieves the content stored at "path" as a []byte.
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func (d *driver) GetContent(ctx context.Context, path string) ([]byte, error) {
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content, err := d.Conn.ObjectGetBytes(d.Container, d.swiftPath(path))
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if err != nil {
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return nil, parseError(path, err)
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}
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return content, nil
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}
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// PutContent stores the []byte content at a location designated by "path".
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func (d *driver) PutContent(ctx context.Context, path string, contents []byte) error {
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if dir, err := d.createParentFolder(path); err != nil {
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return parseError(dir, err)
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}
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err := d.Conn.ObjectPutBytes(d.Container, d.swiftPath(path),
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contents, d.getContentType())
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return parseError(path, err)
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}
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// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
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// given byte offset.
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func (d *driver) ReadStream(ctx context.Context, path string, offset int64) (io.ReadCloser, error) {
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headers := make(swift.Headers)
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headers["Range"] = "bytes=" + strconv.FormatInt(offset, 10) + "-"
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file, _, err := d.Conn.ObjectOpen(d.Container, d.swiftPath(path), false, headers)
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if err != nil {
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if swiftErr, ok := err.(*swift.Error); ok && swiftErr.StatusCode == 416 {
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return ioutil.NopCloser(bytes.NewReader(nil)), nil
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}
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return nil, parseError(path, err)
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}
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return file, nil
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}
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// WriteStream stores the contents of the provided io.Reader at a
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// location designated by the given path. The driver will know it has
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// received the full contents when the reader returns io.EOF. The number
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// of successfully READ bytes will be returned, even if an error is
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// returned. May be used to resume writing a stream by providing a nonzero
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// offset. Offsets past the current size will write from the position
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// beyond the end of the file.
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func (d *driver) WriteStream(ctx context.Context, path string, offset int64, reader io.Reader) (int64, error) {
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var (
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segments []swift.Object
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paddingReader io.Reader
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)
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partNumber := int64(1)
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bytesRead := int64(0)
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currentLength := int64(0)
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zeroBuf := make([]byte, d.ChunkSize)
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segmentsContainer := d.Container + "_segments"
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cursor := int64(0)
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getSegment := func() string {
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return d.swiftPath(path) + "/" + fmt.Sprintf("%016d", partNumber)
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}
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max := func(a int64, b int64) int64 {
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if a > b {
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return a
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}
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return b
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}
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info, _, err := d.Conn.Object(d.Container, d.swiftPath(path))
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if err != nil {
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if swiftErr, ok := err.(*swift.Error); ok {
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if swiftErr.StatusCode == 404 {
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// Create a object manifest
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if dir, err := d.createParentFolder(path); err != nil {
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return bytesRead, parseError(dir, err)
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}
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headers := make(swift.Headers)
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headers["X-Object-Manifest"] = segmentsContainer + "/" + d.swiftPath(path)
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manifest, err := d.Conn.ObjectCreate(d.Container, d.swiftPath(path), false, "",
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d.getContentType(), headers)
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manifest.Close()
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if err != nil {
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return bytesRead, parseError(path, err)
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}
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} else {
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return bytesRead, parseError(path, err)
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}
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} else {
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return bytesRead, parseError(path, err)
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}
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} else {
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// The manifest already exists. Get all the segments
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currentLength = info.Bytes
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headers := make(swift.Headers)
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headers["Content-Type"] = "application/json"
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opts := &swift.ObjectsOpts{Prefix: d.swiftPath(path), Headers: headers}
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segments, err = d.Conn.Objects(d.Container + "_segments", opts)
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if err != nil {
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return bytesRead, parseError(path, err)
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}
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}
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// First, we skip the existing segments that are not modified by this call
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for i := range segments {
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if offset < cursor + segments[i].Bytes {
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break
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}
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cursor += segments[i].Bytes
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partNumber++
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}
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// We reached the end of the file but we haven't reached 'offset' yet
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// Therefore we add blocks of zeros
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if offset >= currentLength {
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for offset - currentLength >= d.ChunkSize {
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// Insert a block a zero
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d.Conn.ObjectPut(segmentsContainer, getSegment(),
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bytes.NewReader(zeroBuf), false, "",
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d.getContentType(), nil)
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currentLength += d.ChunkSize
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partNumber++
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}
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cursor = currentLength
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paddingReader = bytes.NewReader(zeroBuf)
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} else {
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// Offset is inside the current segment : we need to read the
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// data from the beginning of the segment to offset
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paddingReader, _, err = d.Conn.ObjectOpen(segmentsContainer, getSegment(), false, nil)
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if err != nil {
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return bytesRead, parseError(getSegment(), err)
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}
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}
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multi := io.MultiReader(
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io.LimitReader(paddingReader, offset - cursor),
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io.LimitReader(reader, d.ChunkSize - (offset - cursor)),
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)
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for {
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currentSegment, err := d.Conn.ObjectCreate(segmentsContainer, getSegment(), false, "", d.getContentType(), nil)
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if err != nil {
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return bytesRead, parseError(path, err)
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}
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n, err := io.Copy(currentSegment, multi)
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if err != nil {
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return bytesRead, parseError(path, err)
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}
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if n < d.ChunkSize {
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// We wrote all the data
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if cursor + n < currentLength {
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// Copy the end of the chunk
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headers := make(swift.Headers)
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headers["Range"] = "bytes=" + strconv.FormatInt(cursor + n, 10) + "-" + strconv.FormatInt(cursor + d.ChunkSize, 10)
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file, _, err := d.Conn.ObjectOpen(d.Container, d.swiftPath(path), false, headers)
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if err != nil {
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return bytesRead, parseError(path, err)
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}
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io.Copy(currentSegment, file)
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file.Close()
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}
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if n > 0 {
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currentSegment.Close()
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bytesRead += n - max(0, offset - cursor)
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}
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break
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}
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currentSegment.Close()
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bytesRead += n - max(0, offset - cursor)
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multi = io.MultiReader(io.LimitReader(reader, d.ChunkSize))
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cursor += d.ChunkSize
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partNumber++
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}
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return bytesRead, nil
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}
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// Stat retrieves the FileInfo for the given path, including the current size
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// in bytes and the creation time.
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func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo, error) {
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info, _, err := d.Conn.Object(d.Container, d.swiftPath(path))
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if err != nil {
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return nil, parseError(path, err)
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}
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fi := storagedriver.FileInfoFields{
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Path: path,
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IsDir: info.ContentType == "application/directory",
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Size: info.Bytes,
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ModTime: info.LastModified,
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}
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return storagedriver.FileInfoInternal{FileInfoFields: fi}, nil
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}
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// List returns a list of the objects that are direct descendants of the given path.
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func (d *driver) List(ctx context.Context, path string) ([]string, error) {
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prefix := d.swiftPath(path)
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if prefix != "" {
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prefix += "/"
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}
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opts := &swift.ObjectsOpts{
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Path: prefix,
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Delimiter: '/',
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}
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files, err := d.Conn.ObjectNames(d.Container, opts)
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for index, name := range files {
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files[index] = "/" + strings.TrimSuffix(name, "/")
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}
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return files, parseError(path, err)
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}
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// Move moves an object stored at sourcePath to destPath, removing the original
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// object.
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func (d *driver) Move(ctx context.Context, sourcePath string, destPath string) error {
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err := d.Conn.ObjectMove(d.Container, d.swiftPath(sourcePath),
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d.Container, d.swiftPath(destPath))
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if err != nil {
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return parseError(sourcePath, err)
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}
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return nil
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}
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// Delete recursively deletes all objects stored at "path" and its subpaths.
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func (d *driver) Delete(ctx context.Context, path string) error {
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opts := swift.ObjectsOpts{
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Prefix: d.swiftPath(path),
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}
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objects, err := d.Conn.ObjectNamesAll(d.Container, &opts)
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if err != nil {
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return parseError(path, err)
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}
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if len(objects) == 0 {
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return storagedriver.PathNotFoundError{Path: path}
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}
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for index, name := range objects {
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objects[index] = name[len(d.Prefix):]
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}
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var multiDelete = true
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if d.BulkDeleteSupport {
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_, err := d.Conn.BulkDelete(d.Container, objects)
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multiDelete = err != nil
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}
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if multiDelete {
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for _, name := range objects {
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if _, headers, err := d.Conn.Object(d.Container, name); err == nil {
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manifest, ok := headers["X-Object-Manifest"]
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if ok {
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components := strings.SplitN(manifest, "/", 2)
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segContainer := components[0]
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segments, err := d.Conn.ObjectNamesAll(segContainer, &swift.ObjectsOpts{ Prefix: components[1] })
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if err != nil {
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return parseError(name, err)
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}
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for _, s := range segments {
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if err := d.Conn.ObjectDelete(segContainer, s); err != nil {
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return parseError(s, err)
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}
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}
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}
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} else {
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return parseError(name, err)
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}
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if err := d.Conn.ObjectDelete(d.Container, name); err != nil {
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return parseError(name, err)
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}
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}
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}
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return nil
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}
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// URLFor returns a URL which may be used to retrieve the content stored at the given path.
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// May return an UnsupportedMethodErr in certain StorageDriver implementations.
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func (d *driver) URLFor(ctx context.Context, path string, options map[string]interface{}) (string, error) {
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return "", storagedriver.ErrUnsupportedMethod
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}
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func (d *driver) swiftPath(path string) string {
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return strings.TrimLeft(strings.TrimRight(d.Prefix, "/")+path, "/")
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}
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func (d *driver) createParentFolder(path string) (string, error) {
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dir := gopath.Dir(path)
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if dir != "/" {
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_, _, err := d.Conn.Object(d.Container, d.swiftPath(dir))
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if swiftErr, ok := err.(*swift.Error); ok && swiftErr.StatusCode == 404 {
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_, err := d.Conn.ObjectPut(d.Container, d.swiftPath(dir), bytes.NewReader(make([]byte, 0)),
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false, "", "application/directory", nil)
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if err != nil {
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return dir, err
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}
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}
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}
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return dir, nil
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}
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func (d *driver) getContentType() string {
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return "application/octet-stream"
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}
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func detectBulkDelete(authURL string) (bulkDelete bool) {
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resp, err := http.Get(filepath.Join(authURL, "..", "..") + "/info")
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if err == nil {
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defer resp.Body.Close()
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||||
decoder := json.NewDecoder(resp.Body)
|
||||
var infos swiftInfo
|
||||
if decoder.Decode(&infos) == nil {
|
||||
_, bulkDelete = infos["bulk_delete"]
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
func parseError(path string, err error) error {
|
||||
if swiftErr, ok := err.(*swift.Error); ok && swiftErr.StatusCode == 404 {
|
||||
return storagedriver.PathNotFoundError{Path: path}
|
||||
}
|
||||
|
||||
return err
|
||||
}
|
||||
141
docs/storage/driver/swift/swift_test.go
Normal file
141
docs/storage/driver/swift/swift_test.go
Normal file
|
|
@ -0,0 +1,141 @@
|
|||
package swift
|
||||
|
||||
import (
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"testing"
|
||||
|
||||
"github.com/lebauce/swift/swifttest"
|
||||
|
||||
"github.com/docker/distribution/context"
|
||||
storagedriver "github.com/docker/distribution/registry/storage/driver"
|
||||
"github.com/docker/distribution/registry/storage/driver/testsuites"
|
||||
|
||||
"gopkg.in/check.v1"
|
||||
)
|
||||
|
||||
// Hook up gocheck into the "go test" runner.
|
||||
func Test(t *testing.T) { check.TestingT(t) }
|
||||
|
||||
type SwiftDriverConstructor func(rootDirectory string) (*Driver, error)
|
||||
|
||||
func init() {
|
||||
var (
|
||||
username string
|
||||
password string
|
||||
authURL string
|
||||
tenant string
|
||||
container string
|
||||
region string
|
||||
prefix string
|
||||
swiftServer *swifttest.SwiftServer
|
||||
err error
|
||||
)
|
||||
if username = os.Getenv("OS_USERNAME"); username == "" {
|
||||
username = os.Getenv("ST_USER")
|
||||
}
|
||||
if password = os.Getenv("OS_PASSWORD"); password == "" {
|
||||
password = os.Getenv("ST_KEY")
|
||||
}
|
||||
if authURL = os.Getenv("OS_AUTH_URL"); authURL == "" {
|
||||
authURL = os.Getenv("ST_AUTH")
|
||||
}
|
||||
tenant = os.Getenv("OS_TENANT_NAME")
|
||||
container = os.Getenv("OS_CONTAINER_NAME")
|
||||
region = os.Getenv("OS_REGION_NAME")
|
||||
prefix = os.Getenv("OS_CONTAINER_PREFIX")
|
||||
|
||||
if username == "" || password == "" || authURL == "" || container == "" {
|
||||
if swiftServer, err = swifttest.NewSwiftServer("localhost"); err != nil {
|
||||
panic(err)
|
||||
}
|
||||
username = "swifttest"
|
||||
password = "swifttest"
|
||||
authURL = swiftServer.AuthURL
|
||||
container = "test"
|
||||
}
|
||||
|
||||
root, err := ioutil.TempDir("", "driver-")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer os.Remove(root)
|
||||
|
||||
swiftDriverConstructor := func(rootDirectory string) (*Driver, error) {
|
||||
parameters := DriverParameters{
|
||||
username,
|
||||
password,
|
||||
authURL,
|
||||
tenant,
|
||||
region,
|
||||
container,
|
||||
prefix,
|
||||
defaultChunkSize,
|
||||
}
|
||||
|
||||
return New(parameters)
|
||||
}
|
||||
|
||||
skipCheck := func() string {
|
||||
return ""
|
||||
}
|
||||
|
||||
driverConstructor := func() (storagedriver.StorageDriver, error) {
|
||||
return swiftDriverConstructor(root)
|
||||
}
|
||||
|
||||
testsuites.RegisterInProcessSuite(driverConstructor, skipCheck)
|
||||
|
||||
RegisterSwiftDriverSuite(swiftDriverConstructor, skipCheck, swiftServer)
|
||||
}
|
||||
|
||||
func RegisterSwiftDriverSuite(swiftDriverConstructor SwiftDriverConstructor, skipCheck testsuites.SkipCheck,
|
||||
swiftServer *swifttest.SwiftServer) {
|
||||
check.Suite(&SwiftDriverSuite{
|
||||
Constructor: swiftDriverConstructor,
|
||||
SkipCheck: skipCheck,
|
||||
SwiftServer: swiftServer,
|
||||
})
|
||||
}
|
||||
|
||||
type SwiftDriverSuite struct {
|
||||
Constructor SwiftDriverConstructor
|
||||
SwiftServer *swifttest.SwiftServer
|
||||
testsuites.SkipCheck
|
||||
}
|
||||
|
||||
func (suite *SwiftDriverSuite) SetUpSuite(c *check.C) {
|
||||
if reason := suite.SkipCheck(); reason != "" {
|
||||
c.Skip(reason)
|
||||
}
|
||||
}
|
||||
|
||||
func (suite *SwiftDriverSuite) TestEmptyRootList(c *check.C) {
|
||||
validRoot, err := ioutil.TempDir("", "driver-")
|
||||
c.Assert(err, check.IsNil)
|
||||
defer os.Remove(validRoot)
|
||||
|
||||
rootedDriver, err := suite.Constructor(validRoot)
|
||||
c.Assert(err, check.IsNil)
|
||||
emptyRootDriver, err := suite.Constructor("")
|
||||
c.Assert(err, check.IsNil)
|
||||
slashRootDriver, err := suite.Constructor("/")
|
||||
c.Assert(err, check.IsNil)
|
||||
|
||||
filename := "/test"
|
||||
contents := []byte("contents")
|
||||
ctx := context.Background()
|
||||
err = rootedDriver.PutContent(ctx, filename, contents)
|
||||
c.Assert(err, check.IsNil)
|
||||
defer rootedDriver.Delete(ctx, filename)
|
||||
|
||||
keys, err := emptyRootDriver.List(ctx, "/")
|
||||
for _, path := range keys {
|
||||
c.Assert(storagedriver.PathRegexp.MatchString(path), check.Equals, true)
|
||||
}
|
||||
|
||||
keys, err = slashRootDriver.List(ctx, "/")
|
||||
for _, path := range keys {
|
||||
c.Assert(storagedriver.PathRegexp.MatchString(path), check.Equals, true)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue