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retrieve from singularity instead of local store closes #111
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package singularity | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
| "io" | ||
|
|
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| singularityclient "github.com/data-preservation-programs/singularity/client/swagger/http" | ||
| "github.com/data-preservation-programs/singularity/client/swagger/http/file" | ||
| "github.com/gotidy/ptr" | ||
| ) | ||
|
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| // io.ReadSeekCloser implementation that reads from remote singularity | ||
| type SingularityReader struct { | ||
| client *singularityclient.SingularityAPI | ||
| fileID uint64 | ||
| offset int64 | ||
| size int64 | ||
| } | ||
|
|
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| func (r *SingularityReader) Read(p []byte) (int, error) { | ||
| logger.Infof("buffer size: %v", len(p)) | ||
|
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| buf := bytes.NewBuffer(p) | ||
| buf.Reset() | ||
|
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| if r.offset >= r.size { | ||
| return 0, io.EOF | ||
| } | ||
|
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| // Figure out how many bytes to read | ||
| readLen := int64(len(p)) | ||
| remainingBytes := r.size - r.offset | ||
| if readLen > remainingBytes { | ||
| readLen = remainingBytes | ||
| } | ||
|
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| _, _, err := r.client.File.RetrieveFile(&file.RetrieveFileParams{ | ||
| Context: context.Background(), | ||
| ID: int64(r.fileID), | ||
| Range: ptr.String(fmt.Sprintf("bytes=%d-%d", r.offset, r.offset+readLen-1)), | ||
| }, buf) | ||
| if err != nil { | ||
| return 0, fmt.Errorf("failed to retrieve file slice: %w", err) | ||
| } | ||
|
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| r.offset += readLen | ||
|
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| return int(readLen), nil | ||
| } | ||
|
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| func (r *SingularityReader) Seek(offset int64, whence int) (int64, error) { | ||
| var newOffset int64 | ||
|
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| switch whence { | ||
| case io.SeekStart: | ||
| newOffset = offset | ||
| case io.SeekCurrent: | ||
| newOffset = r.offset + offset | ||
| case io.SeekEnd: | ||
| newOffset = r.size + offset | ||
| } | ||
|
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| if newOffset > r.size { | ||
| return 0, fmt.Errorf("byte offset would exceed file size") | ||
| } | ||
|
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| r.offset = newOffset | ||
|
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| return r.offset, nil | ||
| } | ||
|
|
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| func (r *SingularityReader) Close() error { | ||
| return nil | ||
| } |
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