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Simplify digest.FromBytes calling convention

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The current implementation of digest.FromBytes returns an error. This
error can never be non-nil, but its presence in the function signature
means each call site needs error handling code for an error that is
always nil.

I verified that none of the hash.Hash implementations in the standard
library can return an error on Write. Nor can any of the hash.Hash
implementations vendored in distribution.

This commit changes digest.FromBytes not to return an error. If Write
returns an error, it will panic, but as discussed above, this should
never happen.

This commit also avoids using a bytes.Reader to feed data into the hash
function in FromBytes. This makes the hypothetical case that would panic
a bit more explicit, and should also be more performant.

Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
This commit is contained in:
Aaron Lehmann 2015-12-14 14:30:51 -08:00
parent e6363e8a20
commit 58232e50cf
10 changed files with 14 additions and 58 deletions
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7
docs/storage/blobstore.go
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@ -56,12 +56,7 @@ func (bs *blobStore) Open(ctx context.Context, dgst digest.Digest) (distribution
// content is already present, only the digest will be returned. This should
// only be used for small objects, such as manifests. This implemented as a convenience for other Put implementations
func (bs *blobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
dgst, err := digest.FromBytes(p)
if err != nil {
context.GetLogger(ctx).Errorf("blobStore: error digesting content: %v, %s", err, string(p))
return distribution.Descriptor{}, err
}
dgst := digest.FromBytes(p)
desc, err := bs.statter.Stat(ctx, dgst)
if err == nil {
// content already present