Bittorrent downloader written by rust

This project is relevant bittorrent protocol.

Current support a tui program to use the downloader.

I will support the win/linux/android platform by using yew + tauri, that is, the application will be wholly written by rust program language(with some js code for wasm-bingen).

Now only supporting basic BtTorrent protocol, not including DHT, Fast extension

Create Entity Entity:

graph TB
engine_spawn--> EngineHandle
engine_spawn--> AlertReceiver
EngineHandle-->|new|Engine
Engine-->|joinhandle + engine_tx|EngineHandle
Engine-->|new|Disk
Disk-->|jonhandle + disk_tx|Engine

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Create a Torrent file instance:

graph TB 
torrent_params-->|pass|Engine
Engine---engine_tx
engine_tx-->|create_torrent|Torrent
engine_tx-->|NewTorrent|Disk
Torrent-->|insert TorrentEntity|Engine

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Components channels:

graph TB
Conf-->Engine
Engine==>|create|Alert_rx
Engine-->|create|Disk
Engine-->|create|TorrentA
Engine-->|create|TorrentB
Engine-->|Command Send|Disk
TorrentA-->|Command Send|Disk
TorrentB-->|Command Send|Disk
Engine-->|Command Send|TorrentA
Engine-->|Command Send|TorrentB
Disk==>|TorrentComplete or TorrentStats or Error|Alert_rx
Engine==>|TorrentComplete or TorrentStats or Error|Alert_rx
TorrentA==>|TorrentComplete or TorrentStats or Error|Alert_rx
TorrentB==>|TorrentComplete or TorrentStats or Error|Alert_rx

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Shutdown() the engine and wait their joinhandle:

graph TB
EngineHandle-->|engine_tx|Engine
Engine-->|torrent_tx|TorrentA
Engine-->|torrent_tx|TorrentB
Engine-->|disk_tx|Disk

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