A storage provider which passes requests to other storage providers based on the size of the blob being requested.

class*args, **kwargs)

Bases: dict

max_size: int
storage: StorageABC
class List[SizeLimitedStorageType], fallback: StorageABC)

Bases: StorageABC

has_blob(digest: Digest) bool

Return True if the blob with the given instance/digest exists.

get_blob(digest: Digest) IO[bytes] | None

Return a file-like object containing the blob. Most implementations will read the entire file into memory and return a BytesIO object. Eventually this should be corrected to handle files which cannot fit into memory.

The file-like object must be readable and seekable.

If the blob isn’t present in storage, return None.

delete_blob(digest: Digest)

Delete the blob from storage if it’s present.

begin_write(digest: Digest) IO[bytes]

Return a file-like object to which a blob’s contents could be written.

commit_write(digest: Digest, write_session: IOBase)

Commit the write operation. write_session must be an object returned by begin_write.

The storage object is not responsible for verifying that the data written to the write_session actually matches the digest. The caller must do that.