Storage driver for: Google Cloud Storage (gcs)
Signed-off-by: Arthur Baars <arthur@semmle.com>
This commit is contained in:
Arthur Baars
parent
b38b98c8a8
commit
98ad17f757
3 changed files with 732 additions and 0 deletions
3
docs/storage/driver/gcs/doc.go
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3
docs/storage/driver/gcs/doc.go
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// Package gcs implements the Google Cloud Storage driver backend. Support can be
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// enabled by including the "include_gcs" build tag.
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package gcs
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623
docs/storage/driver/gcs/gcs.go
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623
docs/storage/driver/gcs/gcs.go
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// Package gcs provides a storagedriver.StorageDriver implementation to
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// store blobs in Google cloud storage.
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//
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// This package leverages the google.golang.org/cloud/storage client library
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//for interfacing with gcs.
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//
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// Because gcs 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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//
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// Keep in mind that gcs guarantees only eventual consistency, so do not assume
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// that a successful write will mean immediate access to the data written (although
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// in most regions a new object put has guaranteed read after write). The only true
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// guarantee is that once you call Stat and receive a certain file size, that much of
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// the file is already accessible.
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//
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// +build include_gcs
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package gcs
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"math/rand"
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"net/http"
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"net/url"
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"sort"
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"strings"
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"time"
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"golang.org/x/net/context"
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"golang.org/x/oauth2"
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"golang.org/x/oauth2/google"
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"google.golang.org/api/googleapi"
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storageapi "google.golang.org/api/storage/v1"
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"google.golang.org/cloud"
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"google.golang.org/cloud/storage"
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ctx "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 = "gcs"
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const dummyProjectID = "<unknown>"
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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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bucket string
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keyfile string
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rootDirectory string
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}
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func init() {
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factory.Register(driverName, &gcsDriverFactory{})
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}
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// gcsDriverFactory implements the factory.StorageDriverFactory interface
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type gcsDriverFactory struct{}
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// Create StorageDriver from parameters
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func (factory *gcsDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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return FromParameters(parameters)
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}
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// driver is a storagedriver.StorageDriver implementation backed by GCS
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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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client *http.Client
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bucket string
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email string
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privateKey []byte
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rootDirectory string
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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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// - bucket
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func FromParameters(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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bucket, ok := parameters["bucket"]
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if !ok || fmt.Sprint(bucket) == "" {
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return nil, fmt.Errorf("No bucket parameter provided")
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}
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keyfile, ok := parameters["keyfile"]
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if !ok {
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keyfile = ""
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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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params := driverParameters{
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fmt.Sprint(bucket),
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fmt.Sprint(keyfile),
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fmt.Sprint(rootDirectory),
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}
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return New(params)
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}
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// New constructs a new driver
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func New(params driverParameters) (storagedriver.StorageDriver, error) {
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var ts oauth2.TokenSource
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var err error
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rootDirectory := strings.Trim(params.rootDirectory, "/")
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if rootDirectory != "" {
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rootDirectory += "/"
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}
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d := &driver{
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bucket: params.bucket,
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rootDirectory: rootDirectory,
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}
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if params.keyfile == "" {
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ts, err = google.DefaultTokenSource(context.Background(), storage.ScopeFullControl)
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if err != nil {
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return nil, err
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}
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} else {
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jsonKey, err := ioutil.ReadFile(params.keyfile)
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if err != nil {
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return nil, err
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}
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conf, err := google.JWTConfigFromJSON(
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jsonKey,
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storage.ScopeFullControl,
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)
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if err != nil {
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return nil, err
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}
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ts = conf.TokenSource(context.Background())
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d.email = conf.Email
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d.privateKey = conf.PrivateKey
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}
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client := oauth2.NewClient(context.Background(), ts)
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d.client = client
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if err != nil {
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return nil, err
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}
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return &base.Base{
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StorageDriver: d,
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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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// This should primarily be used for small objects.
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func (d *driver) GetContent(context ctx.Context, path string) ([]byte, error) {
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rc, err := d.ReadStream(context, path, 0)
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if err != nil {
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return nil, err
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}
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defer rc.Close()
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p, err := ioutil.ReadAll(rc)
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if err != nil {
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return nil, err
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}
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return p, nil
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}
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// PutContent stores the []byte content at a location designated by "path".
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// This should primarily be used for small objects.
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func (d *driver) PutContent(context ctx.Context, path string, contents []byte) error {
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wc := storage.NewWriter(d.context(context), d.bucket, d.pathToKey(path))
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wc.ContentType = "application/octet-stream"
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defer wc.Close()
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_, err := wc.Write(contents)
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return err
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}
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// ReadStream retrieves an io.ReadCloser for the content stored at "path"
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// with a given byte offset.
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// May be used to resume reading a stream by providing a nonzero offset.
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func (d *driver) ReadStream(context ctx.Context, path string, offset int64) (io.ReadCloser, error) {
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name := d.pathToKey(path)
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// copied from google.golang.org/cloud/storage#NewReader :
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// to set the additional "Range" header
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u := &url.URL{
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Scheme: "https",
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Host: "storage.googleapis.com",
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Path: fmt.Sprintf("/%s/%s", d.bucket, name),
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}
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req, err := http.NewRequest("GET", u.String(), nil)
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if err != nil {
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return nil, err
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}
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if offset > 0 {
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req.Header.Set("Range", fmt.Sprintf("bytes=%v-", offset))
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}
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res, err := d.client.Do(req)
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if err != nil {
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return nil, err
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}
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if res.StatusCode == http.StatusNotFound {
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res.Body.Close()
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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if res.StatusCode == http.StatusRequestedRangeNotSatisfiable {
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res.Body.Close()
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obj, err := storage.StatObject(d.context(context), d.bucket, name)
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if err != nil {
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return nil, err
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}
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if offset == int64(obj.Size) {
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return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
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}
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return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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}
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if res.StatusCode < 200 || res.StatusCode > 299 {
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res.Body.Close()
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return nil, fmt.Errorf("storage: can't read object %v/%v, status code: %v", d.bucket, name, res.Status)
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}
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return res.Body, nil
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}
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// WriteStream stores the contents of the provided io.ReadCloser at a
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// location designated by the given path.
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// May be used to resume writing a stream by providing a nonzero offset.
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// The offset must be no larger than the CurrentSize for this path.
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func (d *driver) WriteStream(context ctx.Context, path string, offset int64, reader io.Reader) (totalRead int64, err error) {
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if offset < 0 {
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return 0, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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}
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if offset == 0 {
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return d.writeCompletely(context, path, 0, reader)
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}
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service, err := storageapi.New(d.client)
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if err != nil {
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return 0, err
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}
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objService := storageapi.NewObjectsService(service)
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var obj *storageapi.Object
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err = retry(5, func() error {
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o, err := objService.Get(d.bucket, d.pathToKey(path)).Do()
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obj = o
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return err
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})
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// obj, err := retry(5, objService.Get(d.bucket, d.pathToKey(path)).Do)
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if err != nil {
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return 0, err
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}
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// cannot append more chunks, so redo from scratch
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if obj.ComponentCount >= 1023 {
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return d.writeCompletely(context, path, offset, reader)
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}
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// skip from reader
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objSize := int64(obj.Size)
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nn, err := skip(reader, objSize-offset)
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if err != nil {
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return nn, err
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}
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// Size <= offset
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partName := fmt.Sprintf("%v#part-%d#", d.pathToKey(path), obj.ComponentCount)
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gcsContext := d.context(context)
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wc := storage.NewWriter(gcsContext, d.bucket, partName)
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wc.ContentType = "application/octet-stream"
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if objSize < offset {
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err = writeZeros(wc, offset-objSize)
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if err != nil {
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wc.CloseWithError(err)
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return nn, err
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}
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}
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n, err := io.Copy(wc, reader)
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if err != nil {
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wc.CloseWithError(err)
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return nn, err
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}
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err = wc.Close()
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if err != nil {
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return nn, err
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}
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// wc was closed succesfully, so the temporary part exists, schedule it for deletion at the end
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// of the function
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defer storage.DeleteObject(gcsContext, d.bucket, partName)
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req := &storageapi.ComposeRequest{
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Destination: &storageapi.Object{Bucket: obj.Bucket, Name: obj.Name, ContentType: obj.ContentType},
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SourceObjects: []*storageapi.ComposeRequestSourceObjects{
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{
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Name: obj.Name,
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Generation: obj.Generation,
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}, {
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Name: partName,
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Generation: wc.Object().Generation,
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}},
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}
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err = retry(5, func() error { _, err := objService.Compose(d.bucket, obj.Name, req).Do(); return err })
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if err == nil {
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nn = nn + n
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}
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return nn, err
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}
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type request func() error
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func retry(maxTries int, req request) error {
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backoff := time.Second
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var err error
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for i := 0; i < maxTries; i++ {
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err := req()
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if err == nil {
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return nil
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}
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status := err.(*googleapi.Error)
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if status == nil || (status.Code != 429 && status.Code < http.StatusInternalServerError) {
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return err
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}
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time.Sleep(backoff - time.Second + (time.Duration(rand.Int31n(1000)) * time.Millisecond))
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if i <= 4 {
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backoff = backoff * 2
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}
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}
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return err
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}
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func (d *driver) writeCompletely(context ctx.Context, path string, offset int64, reader io.Reader) (totalRead int64, err error) {
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wc := storage.NewWriter(d.context(context), d.bucket, d.pathToKey(path))
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wc.ContentType = "application/octet-stream"
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defer wc.Close()
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// Copy the first offset bytes of the existing contents
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// (padded with zeros if needed) into the writer
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if offset > 0 {
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existing, err := d.ReadStream(context, path, 0)
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if err != nil {
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return 0, err
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}
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defer existing.Close()
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n, err := io.CopyN(wc, existing, offset)
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if err == io.EOF {
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err = writeZeros(wc, offset-n)
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}
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if err != nil {
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return 0, err
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}
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}
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return io.Copy(wc, reader)
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}
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func skip(reader io.Reader, count int64) (int64, error) {
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if count <= 0 {
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return 0, nil
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}
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return io.CopyN(ioutil.Discard, reader, count)
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}
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func writeZeros(wc io.Writer, count int64) error {
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buf := make([]byte, 32*1024)
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for count > 0 {
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size := cap(buf)
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if int64(size) > count {
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size = int(count)
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}
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n, err := wc.Write(buf[0:size])
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if err != nil {
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return err
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}
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count = count - int64(n)
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}
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return nil
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}
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// Stat retrieves the FileInfo for the given path, including the current
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// size in bytes and the creation time.
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func (d *driver) Stat(context ctx.Context, path string) (storagedriver.FileInfo, error) {
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var fi storagedriver.FileInfoFields
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//try to get as file
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gcsContext := d.context(context)
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obj, err := storage.StatObject(gcsContext, d.bucket, d.pathToKey(path))
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if err == nil {
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fi = storagedriver.FileInfoFields{
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Path: path,
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Size: obj.Size,
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ModTime: obj.Updated,
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IsDir: false,
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}
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return storagedriver.FileInfoInternal{FileInfoFields: fi}, nil
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}
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//try to get as folder
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dirpath := d.pathToDirKey(path)
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var query *storage.Query
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query = &storage.Query{}
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query.Prefix = dirpath
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query.MaxResults = 1
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objects, err := storage.ListObjects(gcsContext, d.bucket, query)
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if err != nil {
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return nil, err
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}
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if len(objects.Results) < 1 {
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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fi = storagedriver.FileInfoFields{
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Path: path,
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IsDir: true,
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}
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obj = objects.Results[0]
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if obj.Name == dirpath {
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fi.Size = obj.Size
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fi.ModTime = obj.Updated
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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
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//given path.
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func (d *driver) List(context ctx.Context, path string) ([]string, error) {
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var query *storage.Query
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query = &storage.Query{}
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query.Delimiter = "/"
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query.Prefix = d.pathToDirKey(path)
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list := make([]string, 0, 64)
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for {
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objects, err := storage.ListObjects(d.context(context), d.bucket, query)
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if err != nil {
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return nil, err
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}
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for _, object := range objects.Results {
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// GCS does not guarantee strong consistency between
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// DELETE and LIST operationsCheck that the object is not deleted,
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// so filter out any objects with a non-zero time-deleted
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if object.Deleted.IsZero() {
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name := object.Name
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// Ignore objects with names that end with '#' (these are uploaded parts)
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if name[len(name)-1] != '#' {
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name = d.keyToPath(name)
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list = append(list, name)
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}
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}
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}
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for _, subpath := range objects.Prefixes {
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subpath = d.keyToPath(subpath)
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list = append(list, subpath)
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}
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query = objects.Next
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if query == nil {
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break
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}
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}
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return list, nil
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}
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// Move moves an object stored at sourcePath to destPath, removing the
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// original object.
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func (d *driver) Move(context ctx.Context, sourcePath string, destPath string) error {
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prefix := d.pathToDirKey(sourcePath)
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gcsContext := d.context(context)
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keys, err := d.listAll(gcsContext, prefix)
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if err != nil {
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return err
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}
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if len(keys) > 0 {
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destPrefix := d.pathToDirKey(destPath)
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copies := make([]string, 0, len(keys))
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sort.Strings(keys)
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var err error
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for _, key := range keys {
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dest := destPrefix + key[len(prefix):]
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_, err = storage.CopyObject(gcsContext, d.bucket, key, d.bucket, dest, nil)
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if err == nil {
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copies = append(copies, dest)
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} else {
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break
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}
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}
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// if an error occurred, attempt to cleanup the copies made
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if err != nil {
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for i := len(copies) - 1; i >= 0; i-- {
|
||||
_ = storage.DeleteObject(gcsContext, d.bucket, copies[i])
|
||||
}
|
||||
return err
|
||||
}
|
||||
// delete originals
|
||||
for i := len(keys) - 1; i >= 0; i-- {
|
||||
err2 := storage.DeleteObject(gcsContext, d.bucket, keys[i])
|
||||
if err2 != nil {
|
||||
err = err2
|
||||
}
|
||||
}
|
||||
return err
|
||||
}
|
||||
_, err = storage.CopyObject(gcsContext, d.bucket, d.pathToKey(sourcePath), d.bucket, d.pathToKey(destPath), nil)
|
||||
if err != nil {
|
||||
if status := err.(*googleapi.Error); status != nil {
|
||||
if status.Code == http.StatusNotFound {
|
||||
return storagedriver.PathNotFoundError{Path: sourcePath}
|
||||
}
|
||||
}
|
||||
return err
|
||||
}
|
||||
return storage.DeleteObject(gcsContext, d.bucket, d.pathToKey(sourcePath))
|
||||
}
|
||||
|
||||
// listAll recursively lists all names of objects stored at "prefix" and its subpaths.
|
||||
func (d *driver) listAll(context context.Context, prefix string) ([]string, error) {
|
||||
list := make([]string, 0, 64)
|
||||
query := &storage.Query{}
|
||||
query.Prefix = prefix
|
||||
query.Versions = false
|
||||
for {
|
||||
objects, err := storage.ListObjects(d.context(context), d.bucket, query)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
for _, obj := range objects.Results {
|
||||
// GCS does not guarantee strong consistency between
|
||||
// DELETE and LIST operationsCheck that the object is not deleted,
|
||||
// so filter out any objects with a non-zero time-deleted
|
||||
if obj.Deleted.IsZero() {
|
||||
list = append(list, obj.Name)
|
||||
}
|
||||
}
|
||||
query = objects.Next
|
||||
if query == nil {
|
||||
break
|
||||
}
|
||||
}
|
||||
return list, nil
|
||||
}
|
||||
|
||||
// Delete recursively deletes all objects stored at "path" and its subpaths.
|
||||
func (d *driver) Delete(context ctx.Context, path string) error {
|
||||
prefix := d.pathToDirKey(path)
|
||||
gcsContext := d.context(context)
|
||||
keys, err := d.listAll(gcsContext, prefix)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if len(keys) > 0 {
|
||||
sort.Sort(sort.Reverse(sort.StringSlice(keys)))
|
||||
for _, key := range keys {
|
||||
if err := storage.DeleteObject(gcsContext, d.bucket, key); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
err = storage.DeleteObject(gcsContext, d.bucket, d.pathToKey(path))
|
||||
if err != nil {
|
||||
if status := err.(*googleapi.Error); status != nil {
|
||||
if status.Code == http.StatusNotFound {
|
||||
return storagedriver.PathNotFoundError{Path: path}
|
||||
}
|
||||
}
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// URLFor returns a URL which may be used to retrieve the content stored at
|
||||
// the given path, possibly using the given options.
|
||||
// Returns ErrUnsupportedMethod if this driver has no privateKey
|
||||
func (d *driver) URLFor(context ctx.Context, path string, options map[string]interface{}) (string, error) {
|
||||
if d.privateKey == nil {
|
||||
return "", storagedriver.ErrUnsupportedMethod
|
||||
}
|
||||
|
||||
name := d.pathToKey(path)
|
||||
methodString := "GET"
|
||||
method, ok := options["method"]
|
||||
if ok {
|
||||
methodString, ok = method.(string)
|
||||
if !ok || (methodString != "GET" && methodString != "HEAD") {
|
||||
return "", storagedriver.ErrUnsupportedMethod
|
||||
}
|
||||
}
|
||||
|
||||
expiresTime := time.Now().Add(20 * time.Minute)
|
||||
expires, ok := options["expiry"]
|
||||
if ok {
|
||||
et, ok := expires.(time.Time)
|
||||
if ok {
|
||||
expiresTime = et
|
||||
}
|
||||
}
|
||||
|
||||
opts := &storage.SignedURLOptions{
|
||||
GoogleAccessID: d.email,
|
||||
PrivateKey: d.privateKey,
|
||||
Method: methodString,
|
||||
Expires: expiresTime,
|
||||
}
|
||||
return storage.SignedURL(d.bucket, name, opts)
|
||||
}
|
||||
|
||||
func (d *driver) context(context ctx.Context) context.Context {
|
||||
return cloud.WithContext(context, dummyProjectID, d.client)
|
||||
}
|
||||
|
||||
func (d *driver) pathToKey(path string) string {
|
||||
return strings.TrimRight(d.rootDirectory+strings.TrimLeft(path, "/"), "/")
|
||||
}
|
||||
|
||||
func (d *driver) pathToDirKey(path string) string {
|
||||
return d.pathToKey(path) + "/"
|
||||
}
|
||||
|
||||
func (d *driver) keyToPath(key string) string {
|
||||
return "/" + strings.Trim(strings.TrimPrefix(key, d.rootDirectory), "/")
|
||||
}
|
||||
106
docs/storage/driver/gcs/gcs_test.go
Normal file
106
docs/storage/driver/gcs/gcs_test.go
Normal file
|
|
@ -0,0 +1,106 @@
|
|||
// +build include_gcs
|
||||
|
||||
package gcs
|
||||
|
||||
import (
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"testing"
|
||||
|
||||
ctx "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) }
|
||||
|
||||
var gcsDriverConstructor func(rootDirectory string) (storagedriver.StorageDriver, error)
|
||||
var skipGCS func() string
|
||||
|
||||
func init() {
|
||||
bucket := os.Getenv("REGISTRY_STORAGE_GCS_BUCKET")
|
||||
keyfile := os.Getenv("REGISTRY_STORAGE_GCS_KEYFILE")
|
||||
credentials := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
|
||||
|
||||
root, err := ioutil.TempDir("", "driver-")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer os.Remove(root)
|
||||
|
||||
gcsDriverConstructor = func(rootDirectory string) (storagedriver.StorageDriver, error) {
|
||||
|
||||
parameters := driverParameters{
|
||||
bucket,
|
||||
keyfile,
|
||||
rootDirectory,
|
||||
}
|
||||
|
||||
return New(parameters)
|
||||
}
|
||||
|
||||
// Skip GCS storage driver tests if environment variable parameters are not provided
|
||||
skipGCS = func() string {
|
||||
if bucket == "" || (credentials == "" && keyfile == "") {
|
||||
return "Must set REGISTRY_STORAGE_GCS_BUCKET and (GOOGLE_APPLICATION_CREDENTIALS or REGISTRY_STORAGE_GCS_KEYFILE) to run GCS tests"
|
||||
}
|
||||
return ""
|
||||
}
|
||||
|
||||
testsuites.RegisterSuite(func() (storagedriver.StorageDriver, error) {
|
||||
return gcsDriverConstructor(root)
|
||||
}, skipGCS)
|
||||
}
|
||||
|
||||
func TestEmptyRootList(t *testing.T) {
|
||||
if skipGCS() != "" {
|
||||
t.Skip(skipGCS())
|
||||
}
|
||||
|
||||
validRoot, err := ioutil.TempDir("", "driver-")
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error creating temporary directory: %v", err)
|
||||
}
|
||||
defer os.Remove(validRoot)
|
||||
|
||||
rootedDriver, err := gcsDriverConstructor(validRoot)
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error creating rooted driver: %v", err)
|
||||
}
|
||||
|
||||
emptyRootDriver, err := gcsDriverConstructor("")
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error creating empty root driver: %v", err)
|
||||
}
|
||||
|
||||
slashRootDriver, err := gcsDriverConstructor("/")
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error creating slash root driver: %v", err)
|
||||
}
|
||||
|
||||
filename := "/test"
|
||||
contents := []byte("contents")
|
||||
ctx := ctx.Background()
|
||||
err = rootedDriver.PutContent(ctx, filename, contents)
|
||||
if err != nil {
|
||||
t.Fatalf("unexpected error creating content: %v", err)
|
||||
}
|
||||
defer rootedDriver.Delete(ctx, filename)
|
||||
|
||||
keys, err := emptyRootDriver.List(ctx, "/")
|
||||
for _, path := range keys {
|
||||
if !storagedriver.PathRegexp.MatchString(path) {
|
||||
t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
|
||||
}
|
||||
}
|
||||
|
||||
keys, err = slashRootDriver.List(ctx, "/")
|
||||
for _, path := range keys {
|
||||
if !storagedriver.PathRegexp.MatchString(path) {
|
||||
t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue