/**
* Writes a compressed layer {@link Blob}.
*
* <p>The {@code compressedLayerBlob} is written to the layer directory under the layers directory
* corresponding to the layer blob.
*
* @param compressedLayerBlob the compressed layer {@link Blob} to write out
* @return the {@link CachedLayer} representing the written entry
* @throws IOException if an I/O exception occurs
*/
public async Task <CachedLayer> WriteCompressedAsync(IBlob compressedLayerBlob)
{
compressedLayerBlob = compressedLayerBlob ?? throw new ArgumentNullException(nameof(compressedLayerBlob));
// Creates the layers directory if it doesn't exist.
Files.CreateDirectories(cacheStorageFiles.GetLayersDirectory());
// Creates the temporary directory.
Files.CreateDirectories(cacheStorageFiles.GetTemporaryDirectory());
using (TemporaryDirectory temporaryDirectory =
new TemporaryDirectory(cacheStorageFiles.GetTemporaryDirectory()))
{
SystemPath temporaryLayerDirectory = temporaryDirectory.GetDirectory();
// Writes the layer file to the temporary directory.
WrittenLayer writtenLayer =
await WriteCompressedLayerBlobToDirectoryAsync(compressedLayerBlob, temporaryLayerDirectory).ConfigureAwait(false);
// Moves the temporary directory to the final location.
temporaryDirectory.MoveIfDoesNotExist(cacheStorageFiles.GetLayerDirectory(writtenLayer.LayerDigest));
// Updates cachedLayer with the blob information.
SystemPath layerFile =
cacheStorageFiles.GetLayerFile(writtenLayer.LayerDigest, writtenLayer.LayerDiffId);
return(CachedLayer.CreateBuilder()
.SetLayerDigest(writtenLayer.LayerDigest)
.SetLayerDiffId(writtenLayer.LayerDiffId)
.SetLayerSize(writtenLayer.LayerSize)
.SetLayerBlob(Blobs.From(layerFile))
.Build());
}
}
/**
* Writes an uncompressed {@link Blob} out to the cache directory in the form:
*
* <ul>
* <li>The {@code uncompressedLayerBlob} is written to the layer directory under the layers
* directory corresponding to the layer blob.
* <li>The {@code selector} is written to the selector file under the selectors directory.
* </ul>
*
* @param uncompressedLayerBlob the {@link Blob} containing the uncompressed layer contents to
* write out
* @param selector the optional selector digest to also reference this layer data. A selector
* digest may be a secondary identifier for a layer that is distinct from the default layer
* digest.
* @return the {@link CachedLayer} representing the written entry
* @throws IOException if an I/O exception occurs
*/
public async Task <CachedLayer> WriteUncompressedAsync(IBlob uncompressedLayerBlob, DescriptorDigest selector)
{
uncompressedLayerBlob = uncompressedLayerBlob ?? throw new ArgumentNullException(nameof(uncompressedLayerBlob));
// Creates the layers directory if it doesn't exist.
Files.CreateDirectories(cacheStorageFiles.GetLayersDirectory());
// Creates the temporary directory. The temporary directory must be in the same FileStore as the
// final location for Files.move to work.
Files.CreateDirectories(cacheStorageFiles.GetTemporaryDirectory());
using (TemporaryDirectory temporaryDirectory =
new TemporaryDirectory(cacheStorageFiles.GetTemporaryDirectory()))
{
SystemPath temporaryLayerDirectory = temporaryDirectory.GetDirectory();
// Writes the layer file to the temporary directory.
WrittenLayer writtenLayer =
await WriteUncompressedLayerBlobToDirectoryAsync(uncompressedLayerBlob, temporaryLayerDirectory).ConfigureAwait(false);
// Moves the temporary directory to the final location.
temporaryDirectory.MoveIfDoesNotExist(cacheStorageFiles.GetLayerDirectory(writtenLayer.LayerDigest));
// Updates cachedLayer with the blob information.
SystemPath layerFile =
cacheStorageFiles.GetLayerFile(writtenLayer.LayerDigest, writtenLayer.LayerDiffId);
CachedLayer.Builder cachedLayerBuilder =
CachedLayer.CreateBuilder()
.SetLayerDigest(writtenLayer.LayerDigest)
.SetLayerDiffId(writtenLayer.LayerDiffId)
.SetLayerSize(writtenLayer.LayerSize)
.SetLayerBlob(Blobs.From(layerFile));
// Write the selector file.
if (selector != null)
{
WriteSelector(selector, writtenLayer.LayerDigest);
}
return(cachedLayerBuilder.Build());
}
}
