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NimBold
81 lines
4.4 KiB
Markdown
81 lines
4.4 KiB
Markdown
# Firelink Torrent feature matrix
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This is the current product-facing comparison for BitTorrent features exposed
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by Firelink's bundled Aria2 engine. It intentionally excludes Aria2's generic
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HTTP/FTP/Metalink options, shell hooks, and daemon-admin RPC methods that do not
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belong in the download UI. The Aria2 reference is the [1.37.0 manual](https://aria2.github.io/manual/en/html/aria2c.html).
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## Implemented
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- Local `.torrent` files, magnet links, and remote HTTP(S) `.torrent` metadata.
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Remote metadata is bounded, SSRF-checked, redirect-checked, parsed, and
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cached before it enters the normal `addTorrent` path.
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- Bencode validation, canonical info-hash checks, safe output paths, managed
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metadata retention, selected-file preview, `select-file`, and `index-out`.
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- Firelink queue admission, per-queue/global permits, pause/resume, cancel,
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retry/GID replacement, restart recovery, terminal reconciliation, and
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output ownership for Torrent lifecycles.
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- Optional seeding by time and/or ratio, upload progress, upload limits,
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seeders telemetry, per-Torrent maximum peers, and the Aria2
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`bt-request-peer-speed-limit` threshold.
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- Bounded, read-only Torrent peer diagnostics through `aria2.getPeers`.
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Firelink discards peer IPs, ports, IDs, and bitfields at the native boundary;
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the selected-Torrent detail view exposes only operational speeds, seeder,
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and choking flags, with a bounded display count.
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- Global DHT, IPv6 DHT, PEX, and Local Peer Discovery toggles.
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- Optional piece-integrity verification, including the explicit policy that
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disables unverified seeding when verification is requested.
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- Optional stall timeout through `bt-stop-timeout`, persisted with each
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Torrent and re-applied when it starts or retries. A value of zero disables
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the policy; Aria2 stops the Torrent after the configured consecutive
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zero-download-speed interval.
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- Additional per-Torrent tracker URLs through `bt-tracker`, with bounded and
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credential-free HTTP/HTTPS/UDP validation.
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- Per-Torrent tracker exclusion through `bt-exclude-tracker`, including Aria2's
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explicit `*` value for excluding all announce URLs. Exclusions are persisted,
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normalized, reapplied on retries, and do not change DHT or PEX settings.
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- Optional `bt-prioritize-piece` preview policy for the head, tail, or both
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ends of every selected file. The constrained policy is validated, persisted,
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normalized, and reapplied when a Torrent starts or retries.
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- Deterministic local Aria2 smoke coverage for metadata resolution, selected
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output, piece priority, pause/resume, ownership, cancellation/removal,
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unavailable trackers, daemon failure, and `bt-stop-timeout` terminal behavior;
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RPC-boundary coverage is separate.
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## Priority tiers for remaining work
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### Tier 0 — reliability and user-visible control
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No remaining Tier 0 items.
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### Tier 1 — transfer policy and storage behavior
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1. **File priority beyond selection** — Aria2 exposes only the binary
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`selected` file state through its Torrent file API and has no supported
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per-file priority option. Firelink therefore does not pretend that
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`select-file` is file priority; this remains pending an engine capability or
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a safe product-level model.
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2. **Safe removal of unselected files** — expose
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`bt-remove-unselected-file` only as an explicit destructive choice, with
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ownership-aware confirmation and tests for cancellation, retry, and
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reconfiguration.
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3. **Encryption policy** — expose `bt-force-encryption`,
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`bt-require-crypto`, and `bt-min-crypto-level` as one validated policy so
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users cannot accidentally select contradictory combinations.
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4. **Tracker timing controls** — expose tracker connect timeout, request
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timeout, and interval only when their effect on battery/network behavior is
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explained and persisted.
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### Tier 2 — advanced networking and daemon tuning
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1. Configurable TCP/UDP listen ports, external IP, DHT entry points, IPv6 DHT
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listen address, and LPD interface, with platform/firewall warnings.
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2. Global BitTorrent open-file limits and peer identity/agent controls.
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3. Aria2 `follow-torrent`/in-memory follow behavior for generic downloads only
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if the resulting child-GID ownership model can be represented safely; the
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current explicit metadata path intentionally avoids unmapped child jobs.
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The first implementation in this task was remote `.torrent` metadata intake;
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follow-up implementations add stall-timeout control, bounded peer diagnostics,
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persisted tracker exclusion, and piece-preview priority.
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