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options to content writers, including pre-providing the input and out…
…put hashes (oras-project#192) Signed-off-by: Avi Deitcher <[email protected]>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,56 @@ | ||
package content | ||
|
||
import ( | ||
"github.com/opencontainers/go-digest" | ||
) | ||
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type WriterOpts struct { | ||
InputHash *digest.Digest | ||
OutputHash *digest.Digest | ||
Blocksize int | ||
} | ||
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type WriterOpt func(*WriterOpts) error | ||
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func DefaultWriterOpts() WriterOpts { | ||
return WriterOpts{ | ||
InputHash: nil, | ||
OutputHash: nil, | ||
Blocksize: DefaultBlocksize, | ||
} | ||
} | ||
|
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// WithInputHash provide the expected input hash to a writer. Writers | ||
// may suppress their own calculation of a hash on the stream, taking this | ||
// hash instead. If the Writer processes the data before passing it on to another | ||
// Writer layer, this is the hash of the *input* stream. | ||
// | ||
// To have a blank hash, use WithInputHash(BlankHash). | ||
func WithInputHash(hash digest.Digest) WriterOpt { | ||
return func(w *WriterOpts) error { | ||
w.InputHash = &hash | ||
return nil | ||
} | ||
} | ||
|
||
// WithOutputHash provide the expected output hash to a writer. Writers | ||
// may suppress their own calculation of a hash on the stream, taking this | ||
// hash instead. If the Writer processes the data before passing it on to another | ||
// Writer layer, this is the hash of the *output* stream. | ||
// | ||
// To have a blank hash, use WithInputHash(BlankHash). | ||
func WithOutputHash(hash digest.Digest) WriterOpt { | ||
return func(w *WriterOpts) error { | ||
w.OutputHash = &hash | ||
return nil | ||
} | ||
} | ||
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// WithBlocksize set the blocksize used by the processor of data. | ||
// The default is DefaultBlocksize, which is the same as that used by io.Copy | ||
func WithBlocksize(blocksize int) WriterOpt { | ||
return func(w *WriterOpts) error { | ||
w.Blocksize = blocksize | ||
return nil | ||
} | ||
} |
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