78 lines
3.9 KiB
Markdown
78 lines
3.9 KiB
Markdown
# ARCHITECTURE
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One binary, three modes. `packages/server` (Relic) is embedded, not a separate product.
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- **Client**: GUI Join, sync WS client (`web_socket_channel` in `packages/core`) + mpv. No server code runs.
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- **Server+Client (Host)**: GUI Host starts `packages/server` in-process, binds port, self-connects via loopback. Host opens ports, runs traffic. Clients open nothing outbound-only.
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- **Headless**: `--headless`, same server package, no window/player init.
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Server side: **Relic** (HTTP + built-in WS). Client side WS: **`web_socket_channel`**
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(Relic has no client; server WS handling stays in Relic).
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Media order (locked): links first (shared http(s) URL, Syncplay-style sync),
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file relay after (server-proxied bytes for the whitelist case).
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## Media paths (links vs file relay)
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Two ways to watch, same sync engine, same Range endpoint:
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1. **Links (primary, shipped):** host shares an http(s) media URL
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(e.g. a Jellyfin Download URL). Viewers stream it directly; the
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server is sync-authority only (`media.url`, no `mediaUrl`). This
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covers most sessions — proxying is usually unnecessary.
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2. **File relay (secondary, local-file half shipped):** host serves
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bytes from their own machine through the server's token-gated
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Range endpoint `GET /m/<sid>/<token>/<name>`. Viewers (and the
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host via loopback) play the server URL. This is the fallback for
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the whitelist case: viewers cannot reach the source, but the
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server/host can (e.g. Jellyfin allowlists the host, not the
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viewers). No server storage — bytes stream file→socket, config +
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logs only, never to disk.
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Backends behind `MediaSource` (`packages/core/lib/src/media_source.dart`):
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`FileMediaSource` (local file — SHIPPED, wired into
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`mountSessionMediaRoute`); `HttpSource` (server fetches a remote URL
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and re-serves it — DEFERRED, Phase 8). `resolveMediaRequest` stays
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framework-agnostic so both ride the same tested Range table.
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## Deferred: remote-host upload tunnel (NOT active protocol)
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If a VPS tier ever needs a *remote* host to push bytes to a server
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it cannot serve from disk, the reserved design is the brief's WSS
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tunnel: host dials out, JSON control frames
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(`hello`/`welcome`+mediaUrl, `open`{id,start,end}, `ack`, `cancel`,
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`eof`/`err`) plus binary `[u32 BE reqId][payload]` chunks —
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chunk 256 KiB, credit window 8 (≈2 MiB in flight), max 16 concurrent
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`open`, relay acks only after socket flush (real backpressure).
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`RelayConstants.chunkBytes/creditWindowChunks/maxConcurrentOpen`
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are reserved for this. No code exists; direct-serve covers v1
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(host IS the server, opens ports itself).
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Host playback goes through loopback like everyone else's
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(`http://127.0.0.1:<port>/…`) — same code path as remote viewers, so
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server bugs surface on the host screen first. Deployment ladder,
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cheapest first: host's own PC (LAN, or internet with port-forward) →
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same binary `--headless` on a friend's always-on box → cheap VPS
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(CGNAT escape; TLS/Caddy deferred with this tier).
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Sync: heavily Syncplay-inspired + original readiness design, NOT 1:1
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(audit done; deviations: clock never moves from reports, no
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pause-on-leave, force-for-all, quorum gate — see HANDOFF §2).
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Additive namespaced extensions only, `proto` bump + `PROTOCOL.md` same-commit.
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No server storage: config + logs only. Media never touches disk.
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## Health reporting (standing rule)
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Every failure must display. Nothing stalls silently.
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- Server `/health` returns machine-readable status: ok, room, viewer
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count, uptime, media, bytes served, version. The app reads it.
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- App surfaces all failure states in UI with cause + what-to-do:
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connecting/reconnecting, wrong secret (401), kicked (403), session
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gone (410), host offline / buffering (503), starvation
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("waiting for X — N.N s buffered"). Backed by a structured status
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signal (severity + message), not bare strings.
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- Errors log via `debugPrint` + stack trace at the boundary, then
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convert to a displayable state. No swallowed exceptions.
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