Add web game (plan2.md) on the independent runtime, merge-blocking gates
Builds the browser game around the existing Rust runtime: a window into the universe, not a second simulation. Pure std, no external crates. New crates: - protocol: versioned, hashable client/server messages + hand-rolled JSON value and total parser (malformed packet -> Err, never panic). - game_runtime: authoritative match state. Resolves turns through the INDEPENDENT interpreter (runtime_under_test::native_resolve), not the reference engine; filters visibility/knowledge; records and regenerates replays. A match is a pure function of (seed, roster, ordered inputs). - web_assets/web_client: embedded browser client (arena, rune editor, knowledge panels, replay viewer) + static HTTP delivery. - server: std::net HTTP + WebSocket (hand-rolled SHA-1/base64/RFC-6455 framing), turn timer, disconnect handling, panic-proof dispatch, poison-tolerant lock. - web_tests: dependency-free WebSocket test client + Phase H gates. Trust hardening per review: - game_runtime no longer delegates to reference_runtime::execute; it runs the independent interpreter that the runtime-equivalence gate proves correct. - Protocol/socket/replay/visibility/resilience gates are merge-blocking (added to the merge_group-required job in merge-gates.yml): 1k matches/0 drift, 10k fuzz/0 panics, 100 headless socket E2E, 0 hidden-state leaks. - Rendered-browser E2E is marked EXTERNAL-BLOCKED: Playwright runs advisory-only (continue-on-error, artifacts) until CI infrastructure with a browser exists; it is treated as unsatisfied, not green. The headless 100-match gate is labeled protocol-level coverage, not rendered-browser coverage. - README documents the hand-rolled crypto/parser audit risk explicitly. Fixes an integer-overflow panic in observed-volatility inference (i64 sum / abs near i64::MIN) that could poison the server mutex. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude Opus 4.8
@@ -0,0 +1,606 @@
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//! `server` — the authoritative match server (Phase B of `plan2.md`), built on
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//! `std::net` with no external crates.
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//!
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//! Responsibilities the server owns: match state, the turn timer, collecting
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//! submitted actions, driving resolution through [`game_runtime`], visibility
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//! filtering, replay recording, and disconnect handling. The browser is served
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//! the embedded client and then speaks the `protocol` over a WebSocket.
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//!
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//! Authority guarantees enforced here and covered by tests:
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//! * **No panic on bad input** — every client packet is decoded with the total
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//! `protocol` decoder; a failure becomes a `ValidationReport`, never a crash.
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//! * **Late input rejected deterministically** — a `SubmitTurn` for any turn
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//! other than the live one, or after the deadline, is rejected with a stable
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//! reason.
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//! * **Disconnect cannot corrupt a match** — a dropped connection simply stops
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//! submitting; that player's turns default to `Wait` and the match continues.
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//! * **Client cannot mutate hidden state** — only intent is accepted, and the
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//! hidden ground truth is never serialized to a client.
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pub mod http;
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pub mod ws;
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use std::collections::BTreeMap;
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use std::io::{BufReader, Write};
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use std::net::{SocketAddr, TcpListener, TcpStream};
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use std::sync::mpsc::{self, Sender};
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use std::sync::{Arc, Mutex};
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use std::thread;
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use std::time::{Duration, Instant};
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use game_runtime::{duel_roster, solo_roster, Match};
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use protocol::{
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Action, ClientMessage, MatchId, PlayerId, ReplayTurn, RuneDiagnostics, ServerMessage,
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};
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/// How long the timer thread sleeps between ticks.
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const TICK: Duration = Duration::from_millis(40);
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/// Replay turns per `ReplayChunk`.
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const REPLAY_CHUNK: usize = 16;
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/// An outbound item for a single connection's writer thread. Routing every
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/// write through one thread keeps frames from interleaving.
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enum Out {
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Text(String),
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Pong(Vec<u8>),
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Close,
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}
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/// One live match plus its scheduling and connection state.
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struct Session {
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m: Match,
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turn_len: Duration,
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deadline: Instant,
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pending: BTreeMap<u32, Action>,
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conns: BTreeMap<u32, Sender<Out>>,
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/// Entity ids that are human-controlled (vs. a dummy).
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human_slots: Vec<u32>,
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}
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impl Session {
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fn deadline_ms(&self, now: Instant) -> u64 {
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self.deadline.saturating_duration_since(now).as_millis() as u64
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}
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fn snapshot_msg(&self, player: u32) -> ServerMessage {
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ServerMessage::MatchState {
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match_id: self.m.id,
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player_id: PlayerId(player),
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turn: self.m.turn,
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snapshot: self.m.visible_for(player),
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}
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}
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}
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/// The shared manager: all matches, behind one mutex.
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pub struct Manager {
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sessions: BTreeMap<u64, Session>,
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next_auto_id: u64,
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turn_ms: u64,
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}
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/// Result of a successful join.
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struct JoinOk {
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match_id: MatchId,
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player_id: u32,
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initial: ServerMessage,
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turn_started: ServerMessage,
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}
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impl Manager {
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fn new(turn_ms: u64) -> Manager {
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Manager { sessions: BTreeMap::new(), next_auto_id: 1, turn_ms }
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}
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fn turn_len(&self) -> Duration {
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Duration::from_millis(self.turn_ms)
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}
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/// Join (or create) a match. `requested = None` creates a fresh solo match
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/// (player + dummy). `requested = Some(id)` joins an existing duel by id, or
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/// creates that duel and takes the first human slot.
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fn join(
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&mut self,
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name: &str,
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requested: Option<MatchId>,
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tx: Sender<Out>,
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) -> Result<JoinOk, String> {
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let now = Instant::now();
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let turn_len = self.turn_len();
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let key = match requested {
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Some(m) => m.0,
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None => {
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let id = self.next_auto_id;
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self.next_auto_id += 1;
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id
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}
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};
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// Create the session if absent.
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if !self.sessions.contains_key(&key) {
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let (roster, human_slots) = if requested.is_some() {
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(duel_roster(name, "opponent"), vec![1u32, 2])
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} else {
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(solo_roster(name), vec![1u32])
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};
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let m = Match::new(MatchId(key), key, roster);
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self.sessions.insert(
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key,
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Session {
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m,
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turn_len,
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deadline: now + turn_len,
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pending: BTreeMap::new(),
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conns: BTreeMap::new(),
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human_slots,
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},
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);
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}
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let session = self.sessions.get_mut(&key).unwrap();
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// Find the first human slot without a live connection.
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let slot = session
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.human_slots
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.iter()
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.copied()
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.find(|s| !session.conns.contains_key(s))
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.ok_or_else(|| "match is full".to_string())?;
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// Adopt the player's chosen name on their entity.
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if let Some(e) = session.m.entity_mut(slot) {
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e.name = name.to_string();
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}
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session.conns.insert(slot, tx);
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Ok(JoinOk {
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match_id: MatchId(key),
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player_id: slot,
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initial: session.snapshot_msg(slot),
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turn_started: ServerMessage::TurnStarted {
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turn: session.m.turn,
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deadline_ms: session.deadline_ms(now),
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},
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})
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}
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/// Queue a turn submission. Rejects late / wrong-turn submissions
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/// deterministically.
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fn submit(
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&mut self,
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match_key: u64,
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player: u32,
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turn: u64,
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action: Action,
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) -> Result<(), String> {
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let now = Instant::now();
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let session = self
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.sessions
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.get_mut(&match_key)
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.ok_or_else(|| "no such match".to_string())?;
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if session.m.finished {
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return Err("match has ended".to_string());
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}
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if turn != session.m.turn {
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return Err(format!(
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"wrong turn: submitted {}, live turn is {}",
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turn, session.m.turn
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));
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}
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if now > session.deadline {
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return Err("late: turn deadline has passed".to_string());
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}
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session.pending.insert(player, action);
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Ok(())
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}
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fn set_program(
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&mut self,
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match_key: u64,
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player: u32,
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tokens: Vec<protocol::RuneTokenWire>,
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) -> Result<RuneDiagnostics, String> {
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let session = self
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.sessions
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.get_mut(&match_key)
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.ok_or_else(|| "no such match".to_string())?;
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session.m.set_program(player, tokens);
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Ok(session.m.diagnostics_for_player(player))
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}
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fn inspect(&self, match_key: u64, target: u32) -> Result<ServerMessage, String> {
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let session = self
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.sessions
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.get(&match_key)
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.ok_or_else(|| "no such match".to_string())?;
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let diagnostics = session.m.diagnostics_for_player(target);
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Ok(ServerMessage::ObservationResult { target, diagnostics })
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}
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fn replay_chunks(&self, match_key: u64) -> Result<Vec<ServerMessage>, String> {
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let session = self
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.sessions
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.get(&match_key)
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.ok_or_else(|| "no such match".to_string())?;
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let m = &session.m;
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let turns: Vec<ReplayTurn> = m
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.replay
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.turns
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.iter()
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.map(|rt| ReplayTurn {
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turn: rt.turn,
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inputs: rt
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.inputs
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.iter()
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.map(|i| (i.player, i.action.clone()))
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.collect(),
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runtime_hash: format!("{}", rt.turn_hash),
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})
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.collect();
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let final_hash = m.final_hash_hex();
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let chunks: Vec<&[ReplayTurn]> = if turns.is_empty() {
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vec![&[]]
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} else {
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turns.chunks(REPLAY_CHUNK).collect()
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};
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let total = chunks.len() as u32;
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Ok(chunks
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.into_iter()
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.enumerate()
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.map(|(i, c)| ServerMessage::ReplayChunk {
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match_id: m.id,
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seed: m.seed,
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index: i as u32,
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total,
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turns: c.to_vec(),
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final_hash: final_hash.clone(),
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})
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.collect())
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}
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/// Advance any match whose deadline has elapsed. Runs under the lock; sends
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/// are non-blocking on unbounded channels.
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fn tick(&mut self, now: Instant) {
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let mut empty: Vec<u64> = Vec::new();
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for (key, session) in self.sessions.iter_mut() {
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if session.conns.is_empty() {
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empty.push(*key);
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continue;
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}
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if session.m.finished || now < session.deadline {
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continue;
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}
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// Resolve the turn from queued submissions.
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let subs: Vec<(u32, Action)> =
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session.pending.iter().map(|(p, a)| (*p, a.clone())).collect();
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let events = session.m.resolve_turn(&subs);
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session.pending.clear();
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let runtime_hash = session.m.last_turn_hash_hex();
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let turn = session.m.turn;
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// Broadcast the resolved state, filtered per player.
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for (pid, tx) in session.conns.iter() {
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let msg = ServerMessage::TurnResolved {
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turn,
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snapshot: session.m.visible_for(*pid),
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runtime_hash: runtime_hash.clone(),
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events: events.clone(),
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};
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let _ = tx.send(Out::Text(msg.encode()));
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}
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// Open the next turn unless the match just ended.
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if !session.m.finished {
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session.deadline = now + session.turn_len;
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let ts = ServerMessage::TurnStarted {
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turn,
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deadline_ms: session.turn_len.as_millis() as u64,
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};
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for tx in session.conns.values() {
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let _ = tx.send(Out::Text(ts.encode()));
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}
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}
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}
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// Drop sessions nobody is connected to (replay no longer reachable).
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for key in empty {
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self.sessions.remove(&key);
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}
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}
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fn disconnect(&mut self, match_key: u64, player: u32) {
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if let Some(session) = self.sessions.get_mut(&match_key) {
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session.conns.remove(&player);
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if session.conns.is_empty() {
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self.sessions.remove(&match_key);
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}
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}
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}
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}
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/// Configuration.
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pub struct Config {
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pub turn_ms: u64,
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}
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impl Config {
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pub fn from_env() -> Config {
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let turn_ms = std::env::var("MAGICKA_TURN_MS")
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.ok()
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.and_then(|v| v.parse().ok())
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.unwrap_or(5000);
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Config { turn_ms }
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}
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}
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/// Start the server on `addr`. Returns the bound address (useful when binding
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/// to port 0 in tests). Spawns the accept loop and the turn-timer thread as
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/// detached background threads.
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pub fn serve(addr: &str, cfg: Config) -> std::io::Result<SocketAddr> {
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let listener = TcpListener::bind(addr)?;
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let local = listener.local_addr()?;
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let manager = Arc::new(Mutex::new(Manager::new(cfg.turn_ms)));
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// Turn timer.
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{
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let mgr = Arc::clone(&manager);
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thread::spawn(move || loop {
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thread::sleep(TICK);
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let now = Instant::now();
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lock(&mgr).tick(now);
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});
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}
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// Accept loop.
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{
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let mgr = Arc::clone(&manager);
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thread::spawn(move || {
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for stream in listener.incoming() {
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if let Ok(stream) = stream {
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let mgr = Arc::clone(&mgr);
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thread::spawn(move || {
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let _ = handle_conn(stream, mgr);
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});
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}
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}
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});
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}
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Ok(local)
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}
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/// Blocking entry point for the binary.
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pub fn run(addr: &str) -> std::io::Result<()> {
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let local = serve(addr, Config::from_env())?;
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eprintln!("magicka-server listening on http://{local} (open it in a browser)");
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loop {
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thread::sleep(Duration::from_secs(3600));
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}
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}
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fn handle_conn(stream: TcpStream, mgr: Arc<Mutex<Manager>>) -> std::io::Result<()> {
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stream.set_nodelay(true).ok();
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let mut head_reader = BufReader::new(stream.try_clone()?);
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let req = match http::read_request(&mut head_reader)? {
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Some(r) => r,
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None => return Ok(()),
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};
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if !req.is_websocket_upgrade() {
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// Static asset.
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let mut s = stream;
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let resp = web_client::http_response(&req.path).unwrap_or_else(web_client::not_found);
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s.write_all(&resp)?;
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return Ok(());
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}
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// Complete the WebSocket handshake.
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let key = match req.websocket_key() {
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Some(k) => k,
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None => return Ok(()),
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};
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let accept = ws::accept_key(key);
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{
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let mut s = stream.try_clone()?;
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s.write_all(http::handshake_response(&accept).as_bytes())?;
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s.flush()?;
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}
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// Writer thread: the only thing that ever writes to this socket.
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let (tx, rx) = mpsc::channel::<Out>();
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let mut write_stream = stream.try_clone()?;
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let writer = thread::spawn(move || {
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for out in rx {
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let r = match out {
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Out::Text(s) => ws::write_text(&mut write_stream, &s),
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Out::Pong(p) => ws::write_pong(&mut write_stream, &p),
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Out::Close => {
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let _ = ws::write_close(&mut write_stream);
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break;
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}
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};
|
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if r.is_err() {
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break;
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}
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||||
}
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});
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// Reader loop.
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let mut read_stream = stream;
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let mut match_key: Option<u64> = None;
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let mut player_id: Option<u32> = None;
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loop {
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match ws::read_message(&mut read_stream) {
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Ok(Some(ws::Message::Text(raw))) => {
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dispatch(&mgr, &tx, &raw, &mut match_key, &mut player_id);
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}
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Ok(Some(ws::Message::Ping(p))) => {
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let _ = tx.send(Out::Pong(p));
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}
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Ok(Some(ws::Message::Pong)) => {}
|
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Ok(Some(ws::Message::Close)) | Ok(None) => break,
|
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Err(_) => break,
|
||||
}
|
||||
}
|
||||
|
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// Disconnect: deregister so the match continues without corruption.
|
||||
if let (Some(k), Some(p)) = (match_key, player_id) {
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lock(&mgr).disconnect(k, p);
|
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}
|
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let _ = tx.send(Out::Close);
|
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drop(tx);
|
||||
let _ = writer.join();
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Dispatch one decoded client message. Never panics: a decode failure or any
|
||||
/// rejected operation becomes a `ValidationReport`/`ErrorEvent`.
|
||||
fn dispatch(
|
||||
mgr: &Arc<Mutex<Manager>>,
|
||||
tx: &Sender<Out>,
|
||||
raw: &str,
|
||||
match_key: &mut Option<u64>,
|
||||
player_id: &mut Option<u32>,
|
||||
) {
|
||||
let msg = match ClientMessage::decode(raw) {
|
||||
Ok(m) => m,
|
||||
Err(e) => {
|
||||
send(tx, ServerMessage::ValidationReport {
|
||||
accepted: false,
|
||||
detail: format!("malformed packet: {e}"),
|
||||
diagnostics: RuneDiagnostics::default(),
|
||||
});
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
match msg {
|
||||
ClientMessage::JoinMatch { name, match_id } => {
|
||||
if player_id.is_some() {
|
||||
send(tx, err_event("already_joined", "this connection already joined a match"));
|
||||
return;
|
||||
}
|
||||
let mut m = lock(mgr);
|
||||
match m.join(&name, match_id, tx.clone()) {
|
||||
Ok(ok) => {
|
||||
*match_key = Some(ok.match_id.0);
|
||||
*player_id = Some(ok.player_id);
|
||||
send(tx, ok.initial);
|
||||
send(tx, ok.turn_started);
|
||||
}
|
||||
Err(detail) => send(tx, err_event("join_failed", &detail)),
|
||||
}
|
||||
}
|
||||
ClientMessage::SubmitTurn { turn, action } => {
|
||||
let (Some(k), Some(p)) = (*match_key, *player_id) else {
|
||||
send(tx, err_event("not_joined", "join a match first"));
|
||||
return;
|
||||
};
|
||||
let res = lock(mgr).submit(k, p, turn, action);
|
||||
match res {
|
||||
Ok(()) => send(tx, ServerMessage::ValidationReport {
|
||||
accepted: true,
|
||||
detail: format!("action queued for turn {turn}"),
|
||||
diagnostics: RuneDiagnostics::default(),
|
||||
}),
|
||||
Err(detail) => send(tx, ServerMessage::ValidationReport {
|
||||
accepted: false,
|
||||
detail,
|
||||
diagnostics: RuneDiagnostics::default(),
|
||||
}),
|
||||
}
|
||||
}
|
||||
ClientMessage::EditRuneProgram { tokens } => {
|
||||
let (Some(k), Some(p)) = (*match_key, *player_id) else {
|
||||
send(tx, err_event("not_joined", "join a match first"));
|
||||
return;
|
||||
};
|
||||
match lock(mgr).set_program(k, p, tokens) {
|
||||
Ok(diagnostics) => send(tx, ServerMessage::ValidationReport {
|
||||
accepted: true,
|
||||
detail: "program updated".to_string(),
|
||||
diagnostics,
|
||||
}),
|
||||
Err(detail) => send(tx, err_event("edit_failed", &detail)),
|
||||
}
|
||||
}
|
||||
ClientMessage::InspectTarget { target } => {
|
||||
let Some(k) = *match_key else {
|
||||
send(tx, err_event("not_joined", "join a match first"));
|
||||
return;
|
||||
};
|
||||
match lock(mgr).inspect(k, target) {
|
||||
Ok(m) => send(tx, m),
|
||||
Err(detail) => send(tx, err_event("inspect_failed", &detail)),
|
||||
}
|
||||
}
|
||||
ClientMessage::RequestReplay { match_id } => {
|
||||
match lock(mgr).replay_chunks(match_id.0) {
|
||||
Ok(chunks) => {
|
||||
for c in chunks {
|
||||
send(tx, c);
|
||||
}
|
||||
}
|
||||
Err(detail) => send(tx, err_event("replay_failed", &detail)),
|
||||
}
|
||||
}
|
||||
ClientMessage::Ping { .. } => {
|
||||
// Liveness only; the WebSocket layer already handles control pings.
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn send(tx: &Sender<Out>, msg: ServerMessage) {
|
||||
let _ = tx.send(Out::Text(msg.encode()));
|
||||
}
|
||||
|
||||
/// Acquire the manager lock, recovering a poisoned guard. A panic in any single
|
||||
/// connection or tick must not permanently brick the server for everyone else.
|
||||
fn lock(mgr: &Arc<Mutex<Manager>>) -> std::sync::MutexGuard<'_, Manager> {
|
||||
mgr.lock().unwrap_or_else(|p| p.into_inner())
|
||||
}
|
||||
|
||||
fn err_event(code: &str, detail: &str) -> ServerMessage {
|
||||
ServerMessage::ErrorEvent { code: code.to_string(), detail: detail.to_string() }
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn manager_join_and_resolve_is_authoritative() {
|
||||
let mut m = Manager::new(10);
|
||||
let (tx, _rx) = mpsc::channel();
|
||||
let ok = m.join("dev", None, tx).unwrap();
|
||||
assert_eq!(ok.player_id, 1);
|
||||
let key = ok.match_id.0;
|
||||
// Submit a cast for the live turn.
|
||||
assert!(m.submit(key, 1, 0, Action::Cast).is_ok());
|
||||
// Wrong turn is rejected deterministically.
|
||||
let e = m.submit(key, 1, 99, Action::Cast).unwrap_err();
|
||||
assert!(e.contains("wrong turn"), "{e}");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn disconnect_drops_session_when_last_leaves() {
|
||||
let mut m = Manager::new(10);
|
||||
let (tx, _rx) = mpsc::channel();
|
||||
let ok = m.join("dev", None, tx).unwrap();
|
||||
let key = ok.match_id.0;
|
||||
assert!(m.sessions.contains_key(&key));
|
||||
m.disconnect(key, 1);
|
||||
assert!(!m.sessions.contains_key(&key));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn duel_assigns_two_human_slots() {
|
||||
let mut m = Manager::new(10);
|
||||
let (tx1, _r1) = mpsc::channel();
|
||||
let (tx2, _r2) = mpsc::channel();
|
||||
let a = m.join("a", Some(MatchId(42)), tx1).unwrap();
|
||||
let b = m.join("b", Some(MatchId(42)), tx2).unwrap();
|
||||
assert_eq!(a.player_id, 1);
|
||||
assert_eq!(b.player_id, 2);
|
||||
// Third join to a full duel is rejected.
|
||||
let (tx3, _r3) = mpsc::channel();
|
||||
assert!(m.join("c", Some(MatchId(42)), tx3).is_err());
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user