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s3.go
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s3.go
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package blobstore
import (
"bytes"
"io"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/service/s3"
)
type s3Store struct {
svc *s3.S3
bucketName string
}
func NewS3(svc *s3.S3, bucketName string) Client {
return &s3Store{svc, bucketName}
}
func (s *s3Store) Put(key string, blob io.Reader, length int64) error {
// aws SDK can't stream, buffer in memory
var buf bytes.Buffer
_, err := io.CopyN(&buf, blob, length)
if err != nil {
return err
}
_, err = s.svc.PutObject(&s3.PutObjectInput{
Bucket: aws.String(s.bucketName),
Key: aws.String(key),
Body: bytes.NewReader(buf.Bytes()),
ContentType: aws.String("application/octet-stream"),
ContentLength: aws.Int64(length),
})
return err
}
func (s *s3Store) Get(key string) (io.ReadCloser, int64, error) {
resp, err := s.svc.GetObject(&s3.GetObjectInput{
Bucket: aws.String(s.bucketName),
Key: aws.String(key),
})
if err != nil {
return nil, 0, err
}
return resp.Body, *resp.ContentLength, nil
}
func (s *s3Store) Delete(key string) error {
_, err := s.svc.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(s.bucketName),
Key: aws.String(key),
})
return err
}
func (s *s3Store) Contains(key string) (bool, error) {
_, err := s.svc.HeadObject(&s3.HeadObjectInput{
Bucket: aws.String(s.bucketName),
Key: aws.String(key),
})
if err != nil {
if rf, ok := err.(awserr.RequestFailure); ok {
// 404 error code requires ListBucket permission, otherwise you get 403:
// https://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectHEAD.html#RESTObjectHEAD_Description
if rf.StatusCode() == 404 {
return false, nil
}
}
return false, err
}
return true, nil
}