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gcs.go
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gcs.go
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package gcs
import (
"context"
"io"
"mime"
"path/filepath"
"cloud.google.com/go/storage"
"github.com/pkg/errors"
"google.golang.org/api/option"
gostorage "github.com/datumforge/datum/pkg/utils/storage"
)
// Storage is a Google Cloud Storage interface
type Storage struct {
bucket *storage.BucketHandle
}
// Config is the configuration for Storage - need to blow this out but initial focus was on s3
type Config struct {
// Enabled is a flag to enable or disable the storage
Enabled bool `json:"enabled" koanf:"enabled" default:"false"`
// CredentialsFile is the path to the credentials file
CredentialsFile string `json:"credentialsFile" koanf:"credentialsFile" default:"./credentials.json"`
// Bucket is the name of the bucket
Bucket string `json:"bucket" koanf:"bucket" default:"yourbucketname"`
}
// NewStorage returns a new GCP Storage with the provided configuration
func NewStorage(ctx context.Context, credentialsFile, bucket string) (*Storage, error) {
client, err := storage.NewClient(ctx, option.WithCredentialsFile(credentialsFile))
if err != nil {
return nil, errors.WithStack(err)
}
return &Storage{bucket: client.Bucket(bucket)}, nil
}
// Save saves content to path
func (g *Storage) Save(ctx context.Context, content io.Reader, path string) (rerr error) {
w := g.bucket.Object(path).NewWriter(ctx)
w.ContentType = mime.TypeByExtension(filepath.Ext(path))
// Close the writer on return
defer func() {
if err := w.Close(); err != nil {
rerr = err
}
}()
if _, err := io.Copy(w, content); err != nil {
return errors.WithStack(err)
}
return errors.WithStack(rerr)
}
// Stat returns path metadata
func (g *Storage) Stat(ctx context.Context, path string) (*gostorage.Stat, error) {
attrs, err := g.bucket.Object(path).Attrs(ctx)
if err != nil {
if errors.Is(err, storage.ErrObjectNotExist) {
return nil, gostorage.ErrNotExist
}
return nil, err
}
return &gostorage.Stat{
ModifiedTime: attrs.Updated,
Size: attrs.Size,
}, nil
}
// Open opens path for reading
func (g *Storage) Open(ctx context.Context, path string) (io.ReadCloser, error) {
r, err := g.bucket.Object(path).NewReader(ctx)
if err != nil {
if errors.Is(err, storage.ErrObjectNotExist) {
return nil, gostorage.ErrNotExist
}
return nil, errors.WithStack(err)
}
return r, errors.WithStack(err)
}
// Delete deletes path
func (g *Storage) Delete(ctx context.Context, path string) error {
return errors.WithStack(g.bucket.Object(path).Delete(ctx))
}
// OpenWithStat opens path for reading with file stats
func (g *Storage) OpenWithStat(ctx context.Context, path string) (io.ReadCloser, *gostorage.Stat, error) {
r, err := g.bucket.Object(path).NewReader(ctx)
if err != nil {
if errors.Is(err, storage.ErrObjectNotExist) {
return nil, nil, gostorage.ErrNotExist
}
}
return r, &gostorage.Stat{
ModifiedTime: r.Attrs.LastModified,
Size: r.Attrs.Size,
}, errors.WithStack(err)
}