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googlestorage.go
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googlestorage.go
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package googlestorage
import (
"context"
"fmt"
"io"
"os"
"time"
"cloud.google.com/go/storage"
"github.com/betas-in/logger"
)
// GCStorage ...
type GCStorage interface {
Upload(path, object string) error
Download(object, path string) (string, error)
Exists(object string) (bool, error)
Close() error
}
type gcStorage struct {
bucket string
timeout time.Duration
client *storage.Client
log *logger.Logger
}
// NewGCStorage ...
func NewGCStorage(bucket string, timeout time.Duration, log *logger.Logger) (GCStorage, error) {
up := gcStorage{}
up.bucket = bucket
up.timeout = timeout
up.log = log
ctx, cancel := context.WithTimeout(context.Background(), up.timeout)
defer cancel()
gac := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
if gac == "" {
return nil, fmt.Errorf("GOOGLE_APPLICATION_CREDENTIALS were not found in the environment")
}
client, err := storage.NewClient(ctx)
if err != nil {
return nil, err
}
up.client = client
return &up, nil
}
func (u *gcStorage) Upload(path, object string) error {
if path == "" {
err := fmt.Errorf("path cannot be empty")
return err
}
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
ctx, cancel := context.WithTimeout(context.Background(), u.timeout)
defer cancel()
bucket := u.client.Bucket(u.bucket)
obj := bucket.Object(object)
writer := obj.NewWriter(ctx)
_, err = io.Copy(writer, file)
if err != nil {
return err
}
err = writer.Close()
if err != nil {
return err
}
return nil
}
func (u *gcStorage) Download(object, path string) (string, error) {
if object == "" || path == "" {
err := fmt.Errorf("object or path cannot be empty")
return "", err
}
file, err := os.CreateTemp("", path)
if err != nil {
return "", err
}
defer file.Close()
ctx, cancel := context.WithTimeout(context.Background(), u.timeout)
defer cancel()
bucket := u.client.Bucket(u.bucket)
obj := bucket.Object(object)
reader, err := obj.NewReader(ctx)
if err == storage.ErrObjectNotExist {
return "", nil
}
if err != nil {
_ = os.Remove(path)
return "", err
}
if _, err = io.Copy(file, reader); err != nil {
_ = os.Remove(path)
return "", err
}
if err := reader.Close(); err != nil {
return "", err
}
return file.Name(), nil
}
func (u *gcStorage) Exists(object string) (bool, error) {
ctx, cancel := context.WithTimeout(context.Background(), u.timeout)
defer cancel()
bucket := u.client.Bucket(u.bucket)
obj := bucket.Object(object)
_, err := obj.NewReader(ctx)
if err == storage.ErrObjectNotExist {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
}
func (u *gcStorage) GetSignedURL() {
// opts := storage.SignedURLOptions{}
// storage.SignedURL("bucket-name", "object-name", &opts)
}
func (u *gcStorage) Close() error {
return u.client.Close()
}