wings/server/backup/backup_s3.go

87 lines
1.9 KiB
Go

package backup
import (
"context"
"fmt"
"github.com/apex/log"
"io"
"net/http"
"os"
"strconv"
)
type S3Backup struct {
Backup
// The pre-signed upload endpoint for the generated backup. This must be
// provided otherwise this request will fail. This allows us to keep all
// of the keys off the daemon instances and the panel can handle generating
// the credentials for us.
PresignedUrl string
}
var _ BackupInterface = (*S3Backup)(nil)
// Generates a new backup on the disk, moves it into the S3 bucket via the provided
// presigned URL, and then deletes the backup from the disk.
func (s *S3Backup) Generate(included *IncludedFiles, prefix string) (*ArchiveDetails, error) {
defer s.Remove()
a := &Archive{
TrimPrefix: prefix,
Files: included,
}
if err := a.Create(s.Path(), context.Background()); err != nil {
return nil, err
}
rc, err := os.Open(s.Path())
if err != nil {
return nil, err
}
defer rc.Close()
if resp, err := s.generateRemoteRequest(rc); err != nil {
return nil, err
} else {
resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("failed to put S3 object, %d:%s", resp.StatusCode, resp.Status)
}
}
return s.Details(), err
}
// Removes a backup from the system.
func (s *S3Backup) Remove() error {
return os.Remove(s.Path())
}
// Generates the remote S3 request and begins the upload.
func (s *S3Backup) generateRemoteRequest(rc io.ReadCloser) (*http.Response, error) {
r, err := http.NewRequest(http.MethodPut, s.PresignedUrl, nil)
if err != nil {
return nil, err
}
if sz, err := s.Size(); err != nil {
return nil, err
} else {
r.ContentLength = sz
r.Header.Add("Content-Length", strconv.Itoa(int(sz)))
r.Header.Add("Content-Type", "application/x-gzip")
}
r.Body = rc
log.WithFields(log.Fields{
"endpoint": s.PresignedUrl,
"headers": r.Header,
}).Debug("uploading backup to remote S3 endpoint")
return http.DefaultClient.Do(r)
}