public async Task TestRetrieveAsync()
{
CacheStorageFiles cacheStorageFiles =
new CacheStorageFiles(temporaryFolder.NewFolder().ToPath());
CacheStorageReader cacheStorageReader = new CacheStorageReader(cacheStorageFiles);
// Creates the test layer directory.
DescriptorDigest layerDigest = layerDigest1;
DescriptorDigest layerDiffId = layerDigest2;
Files.CreateDirectories(cacheStorageFiles.GetLayerDirectory(layerDigest));
using (Stream @out =
Files.NewOutputStream(cacheStorageFiles.GetLayerFile(layerDigest, layerDiffId)))
{
byte[] bytes = Encoding.UTF8.GetBytes("layerBlob");
await @out.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
// Checks that the CachedLayer is retrieved correctly.
Maybe <CachedLayer> optionalCachedLayer = cacheStorageReader.Retrieve(layerDigest);
Assert.IsTrue(optionalCachedLayer.IsPresent());
Assert.AreEqual(layerDigest, optionalCachedLayer.Get().GetDigest());
Assert.AreEqual(layerDiffId, optionalCachedLayer.Get().GetDiffId());
Assert.AreEqual("layerBlob".Length, optionalCachedLayer.Get().GetSize());
Assert.AreEqual("layerBlob", await Blobs.WriteToStringAsync(optionalCachedLayer.Get().GetBlob()).ConfigureAwait(false));
// Checks that multiple .layer files means the cache is corrupted.
Files.CreateFile(cacheStorageFiles.GetLayerFile(layerDigest, layerDigest));
try
{
cacheStorageReader.Retrieve(layerDigest);
Assert.Fail("Should have thrown CacheCorruptedException");
}
catch (CacheCorruptedException ex)
{
Assert.That(
ex.Message, Does.StartWith(
"Multiple layer files found for layer with digest "
+ layerDigest.GetHash()
+ " in directory: "
+ cacheStorageFiles.GetLayerDirectory(layerDigest)));
}
}
