services/obs: Service test failed for content mismatch

[Xuanwo]

• Related PR: #957
• Test Case: https://github.com/beyondstorage/go-storage/runs/3982686814?check_suite_focus=true

     When Read a file with offset or size 
      When Read with offset 
        The error should be nil ✔✔
        The content should be match ✔✘✔
      When Read with size 
        The error should be nil ✔✔
        The content should be match ✔✘✔
      When Read with offset and size 
        The error should be nil ✔✔
        The content should be match ✔✘✔

 Failures:

  * /data/actions/beta/go-storage/go-storage/services/obs/tests/storage_test.go 
  Line 14:
  Expected: '138112'
  Actual:   '451281'
  (Should be equal)

  * /data/actions/beta/go-storage/go-storage/services/obs/tests/storage_test.go 
  Line 14:
  Expected: '1288953'
  Actual:   '2688928'
  (Should be equal)

  * /data/actions/beta/go-storage/go-storage/services/obs/tests/storage_test.go 
  Line 14:
  Expected: '49793'
  Actual:   '291284'
  (Should be equal)

Obs implementation must be buggy, let's fix it before release.

[Xuanwo]

obs doesn't support offset and size now:

go-storage/services/obs/storage.go

Lines 185 to 202 in 9aa9a15

 func (s *Storage) read(ctx context.Context, path string, w io.Writer, opt pairStorageRead) (n int64, err error) { 
 	rp := s.getAbsPath(path) 
  
 	input := &obs.GetObjectInput{} 
 	input.Bucket = s.bucket 
 	input.Key = rp 
  
 	output, err := s.client.GetObject(input) 
 	if err != nil { 
 		return 0, err 
 	} 
  
 	rc := output.Body 
 	if opt.HasIoCallback { 
 		rc = iowrap.CallbackReadCloser(rc, opt.IoCallback) 
 	} 
  
 	return io.Copy(w, rc) 

this can be fixed by like:

go-storage/services/bos/storage.go

Lines 181 to 193 in 9aa9a15

 func (s *Storage) read(ctx context.Context, path string, w io.Writer, opt pairStorageRead) (n int64, err error) { 
 	rp := s.getAbsPath(path) 
  
 	output := &api.GetObjectResult{} 
 	if opt.HasOffset && !opt.HasSize { 
 		output, err = s.client.GetObject(s.bucket, rp, nil, opt.Offset) 
 	} else if !opt.HasOffset && opt.HasSize { 
 		output, err = s.client.GetObject(s.bucket, rp, nil, 0, opt.Size-1) 
 	} else if opt.HasSize && opt.HasOffset { 
 		output, err = s.client.GetObject(s.bucket, rp, nil, opt.Offset, opt.Offset+opt.Size-1) 
 	} else { 
 		output, err = s.client.GetObject(s.bucket, rp, nil) 
 	} 

[Xuanwo]

Wait for huaweicloud/huaweicloud-sdk-go-obs#10