Repository: LMCache/LMCache
File: lmcache/v1/storage_backend/__init__.py (Python)

Code before:
        # TODO(Serapheim): there's a chance we don't want the local
        # CPU cache in front of ours. Let's experiment and potentially
        # change that in the future.
        storage_backends[str(weka_backend)] = weka_backend
    if config.gds_path is not None:
        gds_backend = GdsBackend(config, loop, memory_allocator, dst_device)
        storage_backends[str(gds_backend)] = gds_backend
    if config.remote_url is not None:
        remote_backend = RemoteBackend(
            config, metadata, loop, local_cpu_backend, dst_device, lookup_server
        )
        backend_name = str(remote_backend)
        storage_backends[backend_name] = remote_backend

    # Only wrap if audit is enabled in config
    if config.extra_config is not None and config.extra_config.get(
        "audit_backend_enabled", False
    ):
        # First Party
        from lmcache.v1.storage_backend.audit_backend import AuditBackend

        # Conditionally wrap backends with audit logging if enabled in config
        audited_backends = OrderedDict()
        for name, backend in storage_backends.items():
            # Wrap each normal backend with AuditBackend
            if backend.is_normal_backend():
                audited_backend = AuditBackend(backend)
                audited_backends[name] = audited_backend
                logger.info(f"Wrapped {name} with AuditBackend")
            else:
                audited_backends[name] = backend
                logger.info(f"Do not wrap {name} as it is not a normal backend")
        return audited_backends
    else:
        # If audit is not enabled, use the original backends
        return storage_backends


Review comment (suggestion):
`is_normal_backend` sounds a bit weird. why not use `isinstance` instead, such as
```
if isinstance(backend, LocalCPUBackend):
    ...
else:
   ...
```

Code after:
        # TODO(Serapheim): there's a chance we don't want the local
        # CPU cache in front of ours. Let's experiment and potentially
        # change that in the future.
        storage_backends[str(weka_backend)] = weka_backend
    if config.gds_path is not None:
        gds_backend = GdsBackend(config, loop, memory_allocator, dst_device)
        storage_backends[str(gds_backend)] = gds_backend
    if config.remote_url is not None:
        remote_backend = RemoteBackend(
            config, metadata, loop, local_cpu_backend, dst_device, lookup_server
        )
        backend_name = str(remote_backend)
        storage_backends[backend_name] = remote_backend

    # Only wrap if audit is enabled in config
    if config.extra_config is not None and config.extra_config.get(
        "audit_backend_enabled", False
    ):
        # First Party
        from lmcache.v1.storage_backend.audit_backend import AuditBackend

        # Conditionally wrap backends with audit logging if enabled in config
        audited_backends = OrderedDict()
        for name, backend in storage_backends.items():
            # Wrap each normal backend with AuditBackend
            if not isinstance(backend, LocalCPUBackend):
                audited_backend = AuditBackend(backend)
                audited_backends[name] = audited_backend
                logger.info(f"Wrapped {name} with AuditBackend")
            else:
                audited_backends[name] = backend
                logger.info(f"Do not wrap {name} as it is a LocalCPUBackend")
        return audited_backends
    else:
        # If audit is not enabled, use the original backends
        return storage_backends