Module transfers 

Transfer registry and domain types for file downloads and uploads.

Architecture

• Transfer — per-transfer state record.
• TransferKind — discriminates Download vs Upload.
• TransferState — lifecycle state machine (Queued → Running → terminal).
• TransferRegistry — in-memory registry with cancellation tokens.
• TransferRegistryHandle— Arc<RwLock<TransferRegistry>> for Tauri state.
• TransferSpec — discriminated union describing what to enqueue.
• TransferFilter — filter enum for transfer_list.
• TransferQueue — concurrency-capped scheduling layer over TransferRegistry.
• TransferQueueHandle — Arc<TransferQueue> for Tauri state.

OCP contract

• Transfer gains checksum, priority, retries as optional fields later with no breaking change to existing call sites.
• TransferRegistry is decoupled from transfer logic — upload (task 32) reuses the same registry without modification.
• TransferState uses 5 variants as per design.md events line 397.
• TransferSpec is an open enum — new kinds (Move, Copy) are additive.
• TransferFilter is extensible without breaking existing call sites.
• The concurrency cap is a single Arc<Semaphore> — rebuilding on settings changes is one rebuild_semaphore call.

Modules

download

Streaming download implementation.

notify

Terminal-state notification helper for transfers.

progress

Progress event emission helpers for transfers.

upload

Single-part and multipart upload implementation.

Structs

CancelToken

Sender side of a cancellation signal for one transfer.

Transfer

Full state record for one download or upload transfer.

TransferQueue

Concurrency-capped transfer queue wrapping TransferRegistry.

TransferQueueHandle

Tauri managed-state handle for the transfer queue.

TransferRegistry

In-memory registry of active and recently-completed transfers.

TransferRegistryHandle

Tauri managed state handle for the transfer registry.

Enums

TransferFilter

Filter applied by transfer_list to narrow the returned set.

TransferKind

Discriminates between download and upload transfers.

TransferSpec

Discriminated union describing a transfer that can be enqueued into TransferQueue.

TransferState

Lifecycle state of a transfer.

Functions

new_transfer_id