Module persistence 

Download file I/O helpers: partial file detection, stream-to-disk writing, cover art fetch.

Constants

DOWNLOAD_RETRY_BASE_DELAY_MS

Base delay in milliseconds for download retry exponential backoff.

MAX_DOWNLOAD_RETRIES

Maximum number of retry attempts on download network errors.

Functions

attempt_download

Performs a single download attempt, optionally resuming from a partial file.

detect_partial_file

Detects whether a partial file exists on disk with non-zero size.

is_retryable_network_error

Checks whether an error is a transient network failure worth retrying.

save_track_to_disk

Saves a streaming response to disk with formatted filename.

write_response_to_file

Writes a streaming HTTP response to a file, optionally appending.