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s3.go
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s3.go
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package mawsgo
import (
"bytes"
"os"
"path/filepath"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
// ---------------------------------------------------------------------------
// Datovy model pristupu do jednoho bucket
// ---------------------------------------------------------------------------
// API:
// - MAWSMakeBucket - vytvoreni struktury pro pristup na bucket
// - Download(key, local) - stazeni souboru
// - Uploadfile
// - ListObjectKeys
// - DeleteKey
type Bucket struct {
//
BucketName string
Handle *s3.S3
// handle na spojeni AWS (kopiruje se)
AWS *session.Session
//
Downloader *s3manager.Downloader
Uploader *s3manager.Uploader
}
// ---------------------------------------------------------------------------
// vytvoreni Handle na S3:bucket
func (maws *MAWS) MakeBucket(name string) *Bucket {
//
return &Bucket{
BucketName: name,
Handle: s3.New(maws.AWS),
AWS: maws.AWS,
Downloader: s3manager.NewDownloader(maws.AWS),
Uploader: s3manager.NewUploader(maws.AWS),
}
}
// ---------------------------------------------------------------------------
// Predstavuje jeden S3-objekt (soubor) ulozeny v bucket na nejakem prefixu
type BucketKey struct {
// nazev objektu
FileName string
// prefix
Prefix string
// handle na prislusny S3-bucket
Bucket *Bucket
}
// ---------------------------------------------------------------------------
// Konstrukce handle na S3 objekt nadd zadanym S3-bucket
func (b *Bucket) MakeKey(prefix, name string) *BucketKey {
//
return &BucketKey{
FileName: name,
Prefix: prefix,
Bucket: b,
}
}
// ---------------------------------------------------------------------------
// prefix+name
func (bk *BucketKey) Key() string {
//
return filepath.Join(bk.Prefix, bk.FileName)
}
// ---------------------------------------------------------------------------
// Download souboru S3
func (bk *BucketKey) Download(locFile *LocFile) error {
// obsluha lokalniho souboru
f, err := os.Create(locFile.FilePath)
if err != nil {
//
return err
}
// ...
defer f.Close()
// ...
_, err2 := bk.Bucket.Downloader.Download(f, &s3.GetObjectInput{
Bucket: aws.String(bk.Bucket.BucketName),
Key: aws.String(bk.Key()),
})
//
return err2
}
// ---------------------------------------------------------------------------
// Upload of S3 file
func (bk *BucketKey) Upload(locFile *LocFile) error {
// obsluha lokalniho souboru
cont, err := locFile.Read()
//
if err != nil {
return err
}
//
return bk.UploadContent(bytes.NewReader(cont))
}
// ---------------------------------------------------------------------------
// Upload of S3 file
func (bk *BucketKey) UploadContent(readStream *bytes.Reader) error {
//
_, errUp := bk.Bucket.Uploader.Upload(&s3manager.UploadInput{
// identifikace
Bucket: aws.String(bk.Bucket.BucketName),
Key: aws.String(bk.Key()),
// obsah
Body: readStream,
})
//
return errUp
}
// ---------------------------------------------------------------------------
// List content of bucket
func (b *Bucket) ListObjects() (*s3.ListObjectsV2Output, error) {
//
resp, err := b.Handle.ListObjectsV2(&s3.ListObjectsV2Input{
Bucket: aws.String(b.BucketName),
})
//
return resp, err
}
// ---------------------------------------------------------------------------
// List content of bucket
func (b *Bucket) ListObjectKeys() ([]string, error) {
//
resp, err := b.ListObjects()
//
if err != nil {
//
return []string{}, err
}
var _out []string
//
for _, i := range resp.Contents {
//
_out = append(_out, *i.Key)
}
//
return _out, nil
}
// ---------------------------------------------------------------------------
// List content of bucket
func (b *Bucket) DeleteKey(key string) error {
//
_, err := b.Handle.DeleteObject(&s3.DeleteObjectInput{
Bucket: aws.String(b.BucketName),
Key: aws.String(key),
})
//
return err
}