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package s3_backend
import (
"fmt"
"os"
"strings"
"time"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/service/s3/s3iface"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/storage/backend"
"github.com/chrislusf/seaweedfs/weed/util"
)
func init() {
backend.BackendStorageFactories["s3"] = &S3BackendFactory{}
}
type S3BackendFactory struct {
}
func (factory *S3BackendFactory) StorageType() backend.StorageType {
return backend.StorageType("s3")
}
func (factory *S3BackendFactory) BuildStorage(configuration util.Configuration, id string) (backend.BackendStorage, error) {
return newS3BackendStorage(configuration, id)
}
type S3BackendStorage struct {
id string
conn s3iface.S3API
region string
bucket string
}
func newS3BackendStorage(configuration util.Configuration, id string) (s *S3BackendStorage, err error) {
s = &S3BackendStorage{}
s.id = id
s.conn, err = createSession(
configuration.GetString("aws_access_key_id"),
configuration.GetString("aws_secret_access_key"),
configuration.GetString("region"))
s.region = configuration.GetString("region")
s.bucket = configuration.GetString("bucket")
glog.V(0).Infof("created s3 backend storage %s for region %s bucket %s", s.Name(), s.region, s.bucket)
return
}
func (s *S3BackendStorage) Name() string {
return "s3." + s.id
}
func (s *S3BackendStorage) NewStorageFile(key string) backend.BackendStorageFile {
if strings.HasPrefix(key, "/") {
key = key[1:]
}
f := &S3BackendStorageFile{
backendStorage: s,
key: key,
}
return f
}
type S3BackendStorageFile struct {
backendStorage *S3BackendStorage
key string
}
func (s3backendStorageFile S3BackendStorageFile) ReadAt(p []byte, off int64) (n int, err error) {
bytesRange := fmt.Sprintf("bytes=%d-%d", off, off+int64(len(p))-1)
getObjectOutput, getObjectErr := s3backendStorageFile.backendStorage.conn.GetObject(&s3.GetObjectInput{
Bucket: &s3backendStorageFile.backendStorage.bucket,
Key: &s3backendStorageFile.key,
Range: &bytesRange,
})
if getObjectErr != nil {
return 0, fmt.Errorf("bucket %s GetObject %s: %v",
s3backendStorageFile.backendStorage.bucket, s3backendStorageFile.key, getObjectErr)
}
defer getObjectOutput.Body.Close()
return getObjectOutput.Body.Read(p)
}
func (s3backendStorageFile S3BackendStorageFile) WriteAt(p []byte, off int64) (n int, err error) {
panic("implement me")
}
func (s3backendStorageFile S3BackendStorageFile) Truncate(off int64) error {
panic("implement me")
}
func (s3backendStorageFile S3BackendStorageFile) Close() error {
return nil
}
func (s3backendStorageFile S3BackendStorageFile) GetStat() (datSize int64, modTime time.Time, err error) {
headObjectOutput, headObjectErr := s3backendStorageFile.backendStorage.conn.HeadObject(&s3.HeadObjectInput{
Bucket: &s3backendStorageFile.backendStorage.bucket,
Key: &s3backendStorageFile.key,
})
if headObjectErr != nil {
return 0, time.Now(), fmt.Errorf("bucket %s HeadObject %s: %v",
s3backendStorageFile.backendStorage.bucket, s3backendStorageFile.key, headObjectErr)
}
datSize = int64(*headObjectOutput.ContentLength)
modTime = *headObjectOutput.LastModified
return
}
func (s3backendStorageFile S3BackendStorageFile) String() string {
return s3backendStorageFile.key
}
func (s3backendStorageFile *S3BackendStorageFile) GetName() string {
return "s3"
}
func (s3backendStorageFile S3BackendStorageFile) Instantiate(src *os.File) error {
panic("implement me")
}
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