def resize(self, manifest: LocalFileManifest,
size: int) -> LocalFileManifest:
# No-op
if size == manifest.size:
return manifest
# Resize
new_manifest, write_operations, removed_ids = prepare_resize(
manifest, size)
for chunk, offset in write_operations:
self.write_chunk(chunk, b"", offset)
for removed_id in removed_ids:
self.clear_chunk_data(removed_id)
return new_manifest
async def _manifest_resize(self, manifest: LocalFileManifest, length: int) -> None:
"""This internal helper does not perform any locking."""
# No-op
if manifest.size == length:
return
# Prepare
manifest, write_operations, removed_ids = prepare_resize(manifest, length)
# Writing
for chunk, offset in write_operations:
await self._write_chunk(chunk, b"", offset)
# Atomic change
await self.local_storage.set_manifest(manifest.id, manifest, removed_ids=removed_ids)
async def _manifest_resize(self,
manifest: LocalFileManifest,
length: int,
cache_only: bool = False) -> None:
"""This internal helper does not perform any locking."""
# No-op
if manifest.size == length:
return
# Prepare
updated = self.device.timestamp()
manifest, write_operations, removed_ids = prepare_resize(
manifest, length, updated)
# Writing
for chunk, offset in write_operations:
await self._write_chunk(chunk, b"", offset)
# Atomic change
await self.local_storage.set_manifest(manifest.id,
manifest,
removed_ids=removed_ids,
cache_only=cache_only)