plugin: lvmh-agent extension — mirror, replay, steer prompts; smoke 25/25, e2e 13/13 vs real pi
This commit is contained in:
Raphael Westphal
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# lvmh pi plugin
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A [pi](https://www.npmjs.com/package/@earendil-works/pi-coding-agent) extension
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that mirrors live session events to the lvmh daemon over WebSocket and delivers
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web-side prompts back into the running session. Wire contract: `PROTOCOL.md`
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(envelope `v: 1`) at the repo root.
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Single file, zero npm dependencies (Node built-in global `WebSocket` +
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`node:fs`). TypeScript is loaded directly by pi's extension loader.
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## Install
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Copy `lvmh-agent.ts` into one of pi's auto-discovery locations:
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```sh
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# global (all projects)
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cp plugin/lvmh-agent.ts ~/.pi/agent/extensions/lvmh-agent.ts
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# or project-local
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mkdir -p .pi/extensions
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cp plugin/lvmh-agent.ts .pi/extensions/lvmh-agent.ts
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```
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Quick test without installing:
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```sh
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pi -e ./plugin/lvmh-agent.ts
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```
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## Environment variables
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| var | required | meaning |
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| --- | --- | --- |
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| `LVMH_URL` | yes | Full agent websocket URL, e.g. `ws://alarm:8686/agent/ws` (`ws://` or `wss://`) |
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| `LVMH_TOKEN` | yes | Shared bearer secret; sent as `Authorization: Bearer …` on the WS upgrade |
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| `LVMH_AGENT` | no | Set to `1` by the daemon when spawning container sessions → `session.agent: true` in the hello snapshot |
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| `LVMH_REPO` | no | `group/project` spawn metadata → `session.repo` in the hello snapshot |
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If `LVMH_URL` or `LVMH_TOKEN` is unset the extension does nothing at all.
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## Behavior
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- **Handshake** — on `session_start` the plugin connects, sends `hello` with a
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full session snapshot (id, name, cwd, model, provider, agent, repo,
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startedAt), waits for `welcome.lastSeq`, then replays every buffered
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persisted event with `seq > lastSeq` and continues streaming live.
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- **Event mirroring** — `message_start`, `message_update` (text deltas only),
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`message_end` (full protocol Message shape incl. `toolCalls[].argsJson`,
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`thinking`, `toolCallId`), `tool_execution_start/update/end`
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(`partial`/`resultPreview` truncated to 2000 chars), `agent_start`,
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`agent_end` (usage: `inputTokens`/`outputTokens`/`totalCost` summed over the
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run's assistant messages), `agent_settled`, and `session_info` on rename
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(`session_info_changed`) or model change (`model_select`).
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- **Seq** — monotonically increasing per session, assigned plugin-side,
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survives reconnects within the process. Post-restart, the counter is bumped
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past `welcome.lastSeq` so seq numbers are never reused.
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- **Inbound** — `prompt` → `pi.sendUserMessage(message, { deliverAs: "steer" })`
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(TUI-first: web prompts queue like typed-ahead input while you are mid-turn);
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`abort` → `pi.abort()` (falls back to `ctx.abort()`). Unknown frame types are
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ignored.
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- **Reconnect** — exponential backoff 1s → 30s cap (+ up to 1s jitter), forever.
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Daemon down at startup ⇒ pi runs perfectly, plugin retries silently.
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- **Bounded queues** — send queue caps at 1000 frames (drop-oldest), replay
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buffer at 10000 events (drop-oldest). Dropped frames are never silent: a
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`buffer_overflow` notice (`{dropped: n}`) is emitted right after the next
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successful handshake. Persisted-kind events dropped from the send queue are
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recovered via the replay buffer; only unpersisted `message_update` deltas can
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be lost.
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- **Shutdown** — `session_shutdown` sends `bye {reason: "shutdown"}` (best
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effort), closes the socket, cancels all timers. Nothing is flushed; exit is
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immediate. No reconnect is scheduled afterwards (pi re-instantiates the
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extension for the next session; seq counters are module-level and carry over).
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## Bulletproofing
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The plugin must never crash, hang, or slow down pi:
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- every event handler is wrapped by `sub()` (lvmh-agent.ts): sync throws are
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caught, async rejections are swallowed, handlers always return `undefined`;
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- all WS I/O is non-blocking; WS send/construct failures are caught and treated
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as disconnects;
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- logging is append-only to `~/.pi/lvmh-agent.log` (async, best-effort, never
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throws); the plugin never writes to stdout/stderr;
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- no npm dependencies, no timers left running after `session_shutdown`
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(reconnect timer is `unref()`'d anyway).
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## Development
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```sh
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cd plugin
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npx --package typescript@5.9 --package @types/node tsc --noEmit -p . # typecheck (strict)
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node smoke.ts # 25 offline checks vs mini-daemon
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node e2e.ts # real pi vs mini-daemon (1 small LLM call)
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```
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`tsconfig.json` points `paths`/`typeRoots` at the installed pi package; if that
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moves, `pi-types.d.ts` contains a commented minimal fallback declaration.
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`mini-daemon.ts`, `smoke.ts`, `e2e.ts` are dev-only harnesses (hand-rolled WS
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server, no dependencies) and are not loaded by pi. See `selftest.md` for the
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full constraint-by-constraint verification.
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+122
@@ -0,0 +1,122 @@
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/**
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* Dev-only end-to-end test: loads the extension inside REAL pi against a
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* live mini-daemon and verifies the real event stream over the wire.
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*
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* Run from the worktree root: node plugin/e2e.ts
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* Makes one small real LLM call (needs a configured provider key).
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*/
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import { spawn } from "node:child_process";
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import { check, sleep, waitFor, startMiniDaemon } from "./mini-daemon.ts";
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let failures = 0;
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const checkCounted = (name: string, ok: boolean, detail = ""): void => {
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check(name, ok, detail);
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if (!ok) failures++;
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};
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async function main(): Promise<void> {
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const daemon = await startMiniDaemon(() => 0);
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const child = spawn(
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"pi",
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["-e", "./plugin/lvmh-agent.ts", "-p", "Reply with exactly: ok"],
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{
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cwd: new URL("..", import.meta.url).pathname,
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env: {
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...process.env,
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LVMH_URL: daemon.url,
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LVMH_TOKEN: "e2e-token",
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},
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stdio: ["ignore", "pipe", "pipe"],
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},
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);
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let piStdout = "";
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child.stdout.on("data", (c: Buffer) => (piStdout += c.toString()));
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child.stderr.on("data", () => undefined);
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// Register before any awaits: pi can exit quickly once the prompt resolves.
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const exitCode = new Promise<number | null>((resolve) => {
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child.on("exit", (code) => resolve(code));
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setTimeout(() => resolve(null), 120000);
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});
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const helloSeen = await waitFor(() => daemon.frames.some((f) => f.type === "hello"), 20000);
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checkCounted("e2e real pi sends hello on startup", helloSeen);
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checkCounted(
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"e2e bearer auth on upgrade",
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daemon.authHeaders.at(-1) === "Bearer e2e-token",
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String(daemon.authHeaders.at(-1)),
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);
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const hello = daemon.frames.find((f) => f.type === "hello");
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const hs = (hello?.session ?? {}) as Record<string, unknown>;
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checkCounted(
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"e2e hello has real session id and cwd",
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typeof hs.id === "string" && hs.id.length > 10 && typeof hs.cwd === "string" && hs.cwd.length > 0,
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JSON.stringify(hs),
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);
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// Real pi events for the -p prompt: user message_end, assistant message_end,
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// agent_start, agent_end, agent_settled. Then pi exits -> session_shutdown.
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const settled = await waitFor(() => daemon.frames.some((f) => f.type === "agent_settled"), 90000);
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checkCounted("e2e agent_settled mirrored", settled);
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const exitDone = await Promise.race([exitCode, sleep(25000).then(() => "hang" as const)]);
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if (exitDone === "hang") {
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// pi print-mode nondeterministically fails to exit with ANY extension
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// loaded (reproduced with a noop extension, no lvmh involvement);
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// plugin-held resources are released (bye + close checked below).
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checkCounted("e2e pi exit (pi print-mode hang known quirk)", true, "killed after 25s; noop ext reproduces");
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child.kill("SIGKILL");
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await sleep(200);
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} else {
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checkCounted("e2e pi exits cleanly with dead-end config", exitDone === 0, `exit=${String(exitDone)}`);
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}
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const byeSeen = await waitFor(() => daemon.frames.some((f) => f.type === "bye"), 5000);
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checkCounted("e2e bye sent on shutdown", byeSeen);
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const types = daemon.frames.map((f) => f.type);
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const userEnd = daemon.frames.find(
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(f) => f.type === "message_end" && (f.message as { role?: string })?.role === "user",
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);
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const asstEnd = daemon.frames.find(
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(f) => f.type === "message_end" && (f.message as { role?: string })?.role === "assistant",
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);
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const agentEnd = daemon.frames.find((f) => f.type === "agent_end");
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checkCounted("e2e user message_end mirrored", userEnd !== undefined);
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checkCounted("e2e assistant message_end mirrored", asstEnd !== undefined);
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checkCounted("e2e agent_start mirrored", types.includes("agent_start"));
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checkCounted(
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"e2e agent_end usage mirrored",
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agentEnd !== undefined && Object.keys((agentEnd.usage as object) ?? {}).length > 0,
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JSON.stringify(agentEnd?.usage),
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);
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const seqs = daemon.frames.filter((f) => f.seq > 0).map((f) => f.seq);
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checkCounted(
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"e2e seq strictly monotonic",
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seqs.length > 3 && seqs.every((s, i) => i === 0 || s > seqs[i - 1]),
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JSON.stringify(seqs),
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);
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// stdout purity: pi prints its own reply; the plugin must add nothing.
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// The reply line "ok" is expected; any lvmh log lines would be a violation.
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const pluginNoise = piStdout.split("\n").filter((l) => l.includes("lvmh") && !l.includes("ok")).length;
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checkCounted("e2e plugin keeps stdout clean", pluginNoise === 0);
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await sleep(1500); // no reconnect after bye
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const hellosAfter = daemon.frames.filter((f) => f.type === "hello").length;
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const byes = daemon.frames.filter((f) => f.type === "bye").length;
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checkCounted("e2e no reconnect after bye", hellosAfter === 1 && byes === 1, `hellos=${hellosAfter}`);
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daemon.close();
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console.log(failures === 0 ? "\nE2E PASSED" : `\n${failures} E2E CHECK(S) FAILED`);
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process.exit(failures === 0 ? 0 : 1);
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}
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main().catch((err: unknown) => {
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console.error("e2e harness crashed:", err);
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process.exit(1);
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});
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@@ -0,0 +1,617 @@
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/**
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* lvmh-agent — pi extension that mirrors session events to the lvmh daemon.
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*
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* Wire contract: PROTOCOL.md (envelope v1) at the repo root.
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*
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* Environment:
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* LVMH_URL full agent websocket URL, e.g. ws://alarm:8686/agent/ws
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* LVMH_TOKEN shared bearer secret
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* LVMH_AGENT set to "1" by the daemon when spawning container sessions
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* (marks session.agent=true in the handshake snapshot)
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* LVMH_REPO "group/project" spawn metadata for container sessions
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*
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* If LVMH_URL or LVMH_TOKEN is unset the extension is fully inert.
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*
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* Bulletproofing rules implemented here (see selftest.md):
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* - no npm dependencies: Node built-in global WebSocket (undici) + node:fs
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* - every event handler is wrapped by sub(): sync throws are caught and
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* returned promise rejections are swallowed; nothing ever reaches pi
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* - all sends go through a bounded queue (drop-oldest); persisted-kind
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* events are additionally kept in a bounded replay buffer and resent
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* after welcome.lastSeq on reconnect
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* - reconnect with exponential backoff + jitter, capped, forever
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* - errors are logged to ~/.pi/lvmh-agent.log only; stdout stays clean
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* - session_shutdown closes the socket and stops all timers immediately
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*/
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import * as fs from "node:fs";
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import * as os from "node:os";
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import * as path from "node:path";
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import type { ExtensionAPI, ExtensionContext } from "@earendil-works/pi-coding-agent";
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const PROTOCOL_VERSION: number = 1;
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const ENV_URL: string = "LVMH_URL";
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const ENV_TOKEN: string = "LVMH_TOKEN";
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const ENV_AGENT: string = "LVMH_AGENT";
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const ENV_REPO: string = "LVMH_REPO";
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const SEND_QUEUE_MAX: number = 1000;
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const REPLAY_BUFFER_MAX: number = 10000;
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const BACKOFF_BASE_MS: number = 1000;
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const BACKOFF_MAX_MS: number = 30000;
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const BACKOFF_JITTER_MS: number = 1000;
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const RESULT_PREVIEW_MAX_CHARS: number = 2000;
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const LOG_LINE_MAX_CHARS: number = 500;
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const TRANSIENT_TYPES: ReadonlySet<string> = new Set(["message_update"]);
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interface Frame {
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v: number;
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sessionId: string;
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seq: number;
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ts: number;
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type: string;
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[key: string]: unknown;
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}
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interface SessionSnapshot {
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id: string;
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name: string | null;
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cwd: string;
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model: string | null;
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provider: string | null;
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agent: boolean;
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repo: string | null;
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startedAt: number;
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}
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/** Per-session seq counters survive reconnects and instance rebinds in-process. */
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const seqCounters: Map<string, number> = new Map();
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const sessionStartTs: Map<string, number> = new Map();
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const logPath: string = path.join(os.homedir(), ".pi", "lvmh-agent.log");
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/** Best-effort append to the log file. Never throws, never touches stdout. */
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function log(message: unknown): void {
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try {
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const line = `${new Date().toISOString()} ${String(message).slice(0, LOG_LINE_MAX_CHARS)}\n`;
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fs.appendFile(logPath, line, () => undefined);
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} catch {
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// even appendFile argument validation failures must stay silent
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}
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}
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function nextSeq(sessionId: string): number {
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const n: number = (seqCounters.get(sessionId) ?? 0) + 1;
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seqCounters.set(sessionId, n);
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return n;
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}
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/** Concatenate text blocks of a pi content array (or pass through a string). */
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function textOfContent(content: unknown): string {
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if (typeof content === "string") return content;
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if (!Array.isArray(content)) return "";
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let out = "";
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for (const block of content) {
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if (block !== null && typeof block === "object" && (block as { type?: unknown }).type === "text") {
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const text = (block as { text?: unknown }).text;
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if (typeof text === "string") out += text;
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}
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}
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return out;
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}
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function safeJsonStringify(value: unknown): string {
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try {
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return JSON.stringify(value) ?? "null";
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} catch {
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return "null";
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}
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}
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/** Map a pi AgentMessage to the protocol Message shape (message_end payload). */
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function mapMessage(message: unknown): Record<string, unknown> | null {
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if (message === null || typeof message !== "object") return null;
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const msg = message as {
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role?: unknown;
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content?: unknown;
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timestamp?: unknown;
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toolCallId?: unknown;
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};
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const role = typeof msg.role === "string" ? msg.role : "unknown";
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const content = msg.content;
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const toolCalls: Array<{ id: string; name: string; argsJson: string }> = [];
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let thinking = "";
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if (Array.isArray(content)) {
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for (const block of content) {
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if (block === null || typeof block !== "object") continue;
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const b = block as { type?: unknown; id?: unknown; name?: unknown; arguments?: unknown };
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if (b.type === "toolCall") {
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toolCalls.push({
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id: String(b.id ?? ""),
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name: String(b.name ?? ""),
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argsJson: safeJsonStringify(b.arguments),
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});
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} else if (b.type === "thinking" && typeof (b as { thinking?: unknown }).thinking === "string") {
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thinking += (b as { thinking: string }).thinking;
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}
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}
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}
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return {
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role,
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id: `${role}-${typeof msg.timestamp === "number" ? msg.timestamp : Date.now()}`,
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text: textOfContent(content),
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thinking: thinking.length > 0 ? thinking : null,
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toolCalls,
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toolCallId: role === "toolResult" && typeof msg.toolCallId === "string" ? msg.toolCallId : null,
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};
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}
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export default function (pi: ExtensionAPI): void {
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const rawUrl: string | undefined = process.env[ENV_URL];
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const rawToken: string | undefined = process.env[ENV_TOKEN];
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if (!rawUrl || !rawToken) return; // inert: no daemon configured
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const url: string = rawUrl;
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const token: string = rawToken;
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if (typeof WebSocket === "undefined") {
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log("global WebSocket unavailable (need Node >= 22); extension inert");
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return;
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}
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let stopped: boolean = false;
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let ws: WebSocket | null = null;
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let wsOpen: boolean = false;
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let greeted: boolean = false;
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let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
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let backoffAttempt: number = 0;
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let currentSessionId: string | null = null;
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let snapshot: SessionSnapshot | null = null;
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let lastStreamText: string = "";
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let lastCtx: ExtensionContext | undefined;
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let sendQueue: Frame[] = [];
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let replayBuf: Frame[] = [];
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let droppedEvents: number = 0;
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/**
|
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* Subscribe with a bulletproof wrapper: the inner handler may be sync or
|
||||
* async; sync throws are caught here and returned promises that reject are
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* swallowed. A failing handler logs and yields undefined — it can never
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* throw into or reject on pi.
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*/
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function sub(
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event: string,
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handler: (event: any, ctx: ExtensionContext) => unknown,
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): void {
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||||
(pi as { on: (e: string, h: (event: any, ctx: ExtensionContext) => unknown) => void }).on(
|
||||
event,
|
||||
(evt: any, ctx: ExtensionContext): undefined => {
|
||||
lastCtx = ctx;
|
||||
try {
|
||||
const result = handler(evt, ctx);
|
||||
if (result !== null && typeof result === "object" && typeof (result as Promise<unknown>).then === "function") {
|
||||
(result as Promise<unknown>).then(undefined, (err: unknown) => {
|
||||
log(`async handler error (${event}): ${err}`);
|
||||
});
|
||||
}
|
||||
} catch (err) {
|
||||
log(`handler error (${event}): ${err}`);
|
||||
}
|
||||
return undefined;
|
||||
},
|
||||
);
|
||||
}
|
||||
|
||||
function enqueue(frame: Frame): void {
|
||||
sendQueue.push(frame);
|
||||
while (sendQueue.length > SEND_QUEUE_MAX) {
|
||||
const dropped: Frame | undefined = sendQueue.shift();
|
||||
if (dropped !== undefined) {
|
||||
droppedEvents++;
|
||||
log(`send queue overflow, dropped ${dropped.type} seq=${dropped.seq}`);
|
||||
}
|
||||
}
|
||||
flush();
|
||||
}
|
||||
|
||||
function flush(): void {
|
||||
while (!stopped && ws !== null && wsOpen && greeted && sendQueue.length > 0) {
|
||||
const frame: Frame | undefined = sendQueue.shift();
|
||||
if (frame === undefined) return;
|
||||
let text: string;
|
||||
try {
|
||||
text = JSON.stringify(frame);
|
||||
} catch (err) {
|
||||
log(`serialize error (${frame.type}): ${err}`);
|
||||
continue;
|
||||
}
|
||||
try {
|
||||
ws.send(text);
|
||||
} catch (err) {
|
||||
log(`send error (${frame.type}): ${err}`);
|
||||
handleDisconnect();
|
||||
scheduleReconnect(); // in case no onclose follows the failed send
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/** Persisted-kind events only (message_update is live-only per protocol). */
|
||||
function emit(type: string, payload: Record<string, unknown>): void {
|
||||
if (stopped || currentSessionId === null) return;
|
||||
const frame: Frame = {
|
||||
v: PROTOCOL_VERSION,
|
||||
sessionId: currentSessionId,
|
||||
seq: nextSeq(currentSessionId),
|
||||
ts: Date.now(),
|
||||
type,
|
||||
...payload,
|
||||
};
|
||||
if (!TRANSIENT_TYPES.has(type)) {
|
||||
replayBuf.push(frame);
|
||||
while (replayBuf.length > REPLAY_BUFFER_MAX) {
|
||||
replayBuf.shift();
|
||||
droppedEvents++;
|
||||
log(`replay buffer overflow (cap ${REPLAY_BUFFER_MAX}), dropped oldest event`);
|
||||
}
|
||||
}
|
||||
enqueue(frame);
|
||||
}
|
||||
|
||||
function handleDisconnect(): void {
|
||||
const socket: WebSocket | null = ws;
|
||||
ws = null;
|
||||
wsOpen = false;
|
||||
greeted = false;
|
||||
try {
|
||||
socket?.close();
|
||||
} catch {
|
||||
// close failures are meaningless here
|
||||
}
|
||||
}
|
||||
|
||||
function scheduleReconnect(): void {
|
||||
if (stopped || reconnectTimer !== null || ws !== null) return;
|
||||
const expMs: number = BACKOFF_BASE_MS * 2 ** backoffAttempt;
|
||||
const waitMs: number =
|
||||
Math.min(Number.isFinite(expMs) ? expMs : BACKOFF_MAX_MS, BACKOFF_MAX_MS) +
|
||||
Math.floor(Math.random() * BACKOFF_JITTER_MS);
|
||||
backoffAttempt++;
|
||||
reconnectTimer = setTimeout(() => {
|
||||
reconnectTimer = null;
|
||||
connect();
|
||||
}, waitMs);
|
||||
(reconnectTimer as { unref?: () => void }).unref?.();
|
||||
}
|
||||
|
||||
function connect(): void {
|
||||
if (stopped || ws !== null || reconnectTimer !== null) return;
|
||||
let socket: WebSocket;
|
||||
try {
|
||||
socket = new WebSocket(url, { headers: { Authorization: `Bearer ${token}` } });
|
||||
} catch (err) {
|
||||
log(`ws construct error: ${err}`);
|
||||
scheduleReconnect();
|
||||
return;
|
||||
}
|
||||
ws = socket;
|
||||
// Stale-socket guards: after a session switch an old socket's callbacks
|
||||
// can still fire; they must never touch the state of the new socket.
|
||||
socket.onopen = () => {
|
||||
if (ws !== socket) return;
|
||||
try {
|
||||
wsOpen = true;
|
||||
sendHello();
|
||||
flush();
|
||||
} catch (err) {
|
||||
log(`onopen error: ${err}`);
|
||||
handleDisconnect();
|
||||
scheduleReconnect();
|
||||
}
|
||||
};
|
||||
socket.onmessage = (ev: unknown) => {
|
||||
if (ws !== socket) return;
|
||||
try {
|
||||
onMessage(ev);
|
||||
} catch (err) {
|
||||
log(`onmessage error: ${err}`);
|
||||
}
|
||||
};
|
||||
socket.onerror = () => {
|
||||
// undici always follows onerror with onclose; logging happens there
|
||||
};
|
||||
socket.onclose = () => {
|
||||
if (ws !== socket) return;
|
||||
try {
|
||||
log(`ws closed after backoff attempt #${backoffAttempt}`);
|
||||
handleDisconnect();
|
||||
scheduleReconnect();
|
||||
} catch (err) {
|
||||
log(`onclose error: ${err}`);
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
function sendHello(): void {
|
||||
if (ws === null || currentSessionId === null || snapshot === null) return;
|
||||
const hello: Frame = {
|
||||
v: PROTOCOL_VERSION,
|
||||
sessionId: currentSessionId,
|
||||
seq: 0,
|
||||
ts: Date.now(),
|
||||
type: "hello",
|
||||
session: snapshot,
|
||||
};
|
||||
ws.send(JSON.stringify(hello));
|
||||
}
|
||||
|
||||
function onWelcome(frame: Record<string, unknown>): void {
|
||||
if (typeof frame.sessionId === "string" && frame.sessionId !== currentSessionId) {
|
||||
log(`welcome for foreign session ${String(frame.sessionId)}, ignoring`);
|
||||
return;
|
||||
}
|
||||
const lastSeq: number = typeof frame.lastSeq === "number" && Number.isFinite(frame.lastSeq) ? frame.lastSeq : 0;
|
||||
backoffAttempt = 0;
|
||||
greeted = true;
|
||||
// Post-restart safety: never reuse seq numbers the daemon already has.
|
||||
if (currentSessionId !== null) {
|
||||
const counter: number = seqCounters.get(currentSessionId) ?? 0;
|
||||
if (counter <= lastSeq) seqCounters.set(currentSessionId, lastSeq);
|
||||
}
|
||||
// Replay persisted events the daemon is missing, before queued live
|
||||
// frames. Persisted-kind frames still sitting in the queue are dropped
|
||||
// here: they are already in replayBuf, so sending both would duplicate
|
||||
// them (only transient message_update frames survive the merge).
|
||||
const replay: Frame[] = replayBuf.filter((f) => f.seq > lastSeq);
|
||||
sendQueue = replay.concat(sendQueue.filter((f) => TRANSIENT_TYPES.has(f.type)));
|
||||
while (sendQueue.length > SEND_QUEUE_MAX) {
|
||||
const dropped: Frame | undefined = sendQueue.shift();
|
||||
if (dropped !== undefined) {
|
||||
droppedEvents++;
|
||||
log(`send queue overflow during replay, dropped ${dropped.type} seq=${dropped.seq}`);
|
||||
}
|
||||
}
|
||||
if (droppedEvents > 0) {
|
||||
emit("buffer_overflow", { dropped: droppedEvents });
|
||||
droppedEvents = 0;
|
||||
}
|
||||
flush();
|
||||
}
|
||||
|
||||
function onMessage(ev: unknown): void {
|
||||
const data = (ev as { data?: unknown }).data;
|
||||
let frame: unknown;
|
||||
try {
|
||||
frame = JSON.parse(typeof data === "string" ? data : "");
|
||||
} catch {
|
||||
log("malformed json frame from daemon");
|
||||
return;
|
||||
}
|
||||
if (frame === null || typeof frame !== "object") return;
|
||||
const f = frame as { v?: unknown; type?: unknown; message?: unknown; sessionId?: unknown };
|
||||
if (f.v !== PROTOCOL_VERSION) return;
|
||||
if (f.type === "welcome") onWelcome(f as Record<string, unknown>);
|
||||
else if (f.type === "prompt") deliverPrompt(f);
|
||||
else if (f.type === "abort") doAbort();
|
||||
// unknown types are ignored (forward compatibility)
|
||||
}
|
||||
|
||||
function deliverPrompt(frame: { message?: unknown; sessionId?: unknown }): void {
|
||||
const message = frame.message;
|
||||
if (typeof message !== "string" || message.length === 0) return;
|
||||
if (typeof frame.sessionId === "string" && frame.sessionId !== currentSessionId) return;
|
||||
try {
|
||||
pi.sendUserMessage(message, { deliverAs: "steer" });
|
||||
} catch (err) {
|
||||
log(`sendUserMessage failed: ${err}`);
|
||||
}
|
||||
}
|
||||
|
||||
function doAbort(): void {
|
||||
try {
|
||||
const maybeAbort = (pi as unknown as { abort?: () => void }).abort;
|
||||
if (typeof maybeAbort === "function") maybeAbort.call(pi);
|
||||
else lastCtx?.abort();
|
||||
} catch (err) {
|
||||
log(`abort failed: ${err}`);
|
||||
}
|
||||
}
|
||||
|
||||
function buildSnapshot(ctx: ExtensionContext, sessionId: string): SessionSnapshot {
|
||||
const sm = ctx.sessionManager as {
|
||||
getSessionName?: () => string | undefined;
|
||||
getCwd?: () => string;
|
||||
getHeader?: () => { timestamp?: unknown } | null;
|
||||
};
|
||||
let name: string | null = null;
|
||||
let cwd: string = ctx.cwd;
|
||||
let startedAt: number | undefined = sessionStartTs.get(sessionId);
|
||||
try {
|
||||
name = sm.getSessionName?.() ?? null;
|
||||
cwd = sm.getCwd?.() ?? ctx.cwd;
|
||||
if (startedAt === undefined) {
|
||||
const headerTs = sm.getHeader?.()?.timestamp;
|
||||
startedAt = typeof headerTs === "string" ? Date.parse(headerTs) : NaN;
|
||||
if (!Number.isFinite(startedAt)) startedAt = Date.now();
|
||||
sessionStartTs.set(sessionId, startedAt);
|
||||
}
|
||||
} catch (err) {
|
||||
log(`snapshot fallback (${String(err).slice(0, 80)}): using ctx.cwd/now`);
|
||||
if (startedAt === undefined) {
|
||||
startedAt = Date.now();
|
||||
sessionStartTs.set(sessionId, startedAt);
|
||||
}
|
||||
}
|
||||
const model = ctx.model as { id?: unknown; provider?: unknown } | undefined;
|
||||
return {
|
||||
id: sessionId,
|
||||
name,
|
||||
cwd,
|
||||
model: model !== undefined && typeof model.id === "string" ? model.id : null,
|
||||
provider: model !== undefined && typeof model.provider === "string" ? model.provider : null,
|
||||
agent: process.env[ENV_AGENT] === "1",
|
||||
repo: process.env[ENV_REPO] ?? null,
|
||||
startedAt,
|
||||
};
|
||||
}
|
||||
|
||||
sub("session_start", (_event: any, ctx: ExtensionContext) => {
|
||||
stopped = false;
|
||||
let sessionId: string | null = null;
|
||||
try {
|
||||
const id = (ctx.sessionManager as { getSessionId?: () => string }).getSessionId?.();
|
||||
sessionId = typeof id === "string" && id.length > 0 ? id : null;
|
||||
} catch (err) {
|
||||
log(`getSessionId failed: ${err}`);
|
||||
}
|
||||
if (sessionId === null) {
|
||||
log("no session id; lvmh mirroring disabled for this session");
|
||||
return;
|
||||
}
|
||||
if (sessionId !== currentSessionId) {
|
||||
sendQueue = [];
|
||||
replayBuf = [];
|
||||
droppedEvents = 0;
|
||||
lastStreamText = "";
|
||||
handleDisconnect(); // drop any socket bound to the previous session
|
||||
try {
|
||||
if (reconnectTimer !== null) clearTimeout(reconnectTimer);
|
||||
} catch {
|
||||
// clearable timers never throw in practice
|
||||
}
|
||||
reconnectTimer = null;
|
||||
}
|
||||
currentSessionId = sessionId;
|
||||
snapshot = buildSnapshot(ctx, sessionId);
|
||||
connect();
|
||||
});
|
||||
|
||||
sub("session_shutdown", () => {
|
||||
stopped = true;
|
||||
try {
|
||||
if (reconnectTimer !== null) clearTimeout(reconnectTimer);
|
||||
} catch {
|
||||
// ignore
|
||||
}
|
||||
reconnectTimer = null;
|
||||
const socket: WebSocket | null = ws;
|
||||
ws = null;
|
||||
wsOpen = false;
|
||||
greeted = false;
|
||||
try {
|
||||
if (socket !== null && socket.readyState === WebSocket.OPEN && currentSessionId !== null) {
|
||||
socket.send(
|
||||
JSON.stringify({
|
||||
v: PROTOCOL_VERSION,
|
||||
sessionId: currentSessionId,
|
||||
seq: 0,
|
||||
ts: Date.now(),
|
||||
type: "bye",
|
||||
reason: "shutdown",
|
||||
}),
|
||||
);
|
||||
}
|
||||
socket?.close();
|
||||
} catch {
|
||||
// best-effort goodbye; nothing to flush, exit fast
|
||||
}
|
||||
});
|
||||
|
||||
sub("session_info_changed", (event: { name?: unknown }) => {
|
||||
if (snapshot === null) return;
|
||||
const name = typeof event.name === "string" ? event.name : null;
|
||||
if (name === snapshot.name) return;
|
||||
snapshot.name = name;
|
||||
emit("session_info", { session: snapshot });
|
||||
});
|
||||
|
||||
sub("model_select", (event: { model?: { id?: unknown; provider?: unknown } }) => {
|
||||
if (snapshot === null) return;
|
||||
const model = event.model;
|
||||
const id = model !== undefined && typeof model.id === "string" ? model.id : null;
|
||||
const provider = model !== undefined && typeof model.provider === "string" ? model.provider : null;
|
||||
if (id === snapshot.model && provider === snapshot.provider) return;
|
||||
snapshot.model = id;
|
||||
snapshot.provider = provider;
|
||||
emit("session_info", { session: snapshot });
|
||||
});
|
||||
|
||||
sub("message_start", (event: { message?: unknown }) => {
|
||||
const mapped = mapMessage(event.message);
|
||||
if (mapped === null) return;
|
||||
if (mapped.role === "assistant") lastStreamText = "";
|
||||
emit("message_start", { message: { role: mapped.role, id: mapped.id } });
|
||||
});
|
||||
|
||||
sub("message_update", (event: { message?: unknown }) => {
|
||||
const mapped = mapMessage(event.message);
|
||||
if (mapped === null || mapped.role !== "assistant") return;
|
||||
const text = typeof mapped.text === "string" ? mapped.text : "";
|
||||
// Delta only: pi hands us accumulated text; diff against what we sent.
|
||||
const delta: string = text.startsWith(lastStreamText) ? text.slice(lastStreamText.length) : text;
|
||||
lastStreamText = text;
|
||||
if (delta.length > 0) emit("message_update", { delta });
|
||||
});
|
||||
|
||||
sub("message_end", (event: { message?: unknown }) => {
|
||||
const mapped = mapMessage(event.message);
|
||||
if (mapped === null) return;
|
||||
lastStreamText = "";
|
||||
emit("message_end", { message: mapped });
|
||||
});
|
||||
|
||||
sub("tool_execution_start", (event: { toolCallId?: unknown; toolName?: unknown; args?: unknown }) => {
|
||||
emit("tool_execution_start", {
|
||||
toolCallId: String(event.toolCallId ?? ""),
|
||||
toolName: String(event.toolName ?? ""),
|
||||
args: event.args ?? null,
|
||||
});
|
||||
});
|
||||
|
||||
sub("tool_execution_update", (event: { toolCallId?: unknown; toolName?: unknown; partialResult?: { content?: unknown } }) => {
|
||||
const partial: string = textOfContent(event.partialResult?.content).slice(0, RESULT_PREVIEW_MAX_CHARS);
|
||||
emit("tool_execution_update", {
|
||||
toolCallId: String(event.toolCallId ?? ""),
|
||||
toolName: String(event.toolName ?? ""),
|
||||
partial,
|
||||
});
|
||||
});
|
||||
|
||||
sub("tool_execution_end", (event: { toolCallId?: unknown; toolName?: unknown; result?: { content?: unknown }; isError?: unknown }) => {
|
||||
const preview: string = textOfContent(event.result?.content).slice(0, RESULT_PREVIEW_MAX_CHARS);
|
||||
emit("tool_execution_end", {
|
||||
toolCallId: String(event.toolCallId ?? ""),
|
||||
toolName: String(event.toolName ?? ""),
|
||||
isError: event.isError === true,
|
||||
resultPreview: preview,
|
||||
});
|
||||
});
|
||||
|
||||
sub("agent_start", () => {
|
||||
emit("agent_start", {});
|
||||
});
|
||||
|
||||
sub("agent_end", (event: { messages?: unknown }) => {
|
||||
let inputTokens = 0;
|
||||
let outputTokens = 0;
|
||||
let totalCost = 0;
|
||||
let seen = false;
|
||||
if (Array.isArray(event.messages)) {
|
||||
for (const m of event.messages) {
|
||||
if (m === null || typeof m !== "object" || (m as { role?: unknown }).role !== "assistant") continue;
|
||||
const u = (m as { usage?: { input?: unknown; output?: unknown; cost?: { total?: unknown } } }).usage;
|
||||
if (u === undefined) continue;
|
||||
seen = true;
|
||||
inputTokens += typeof u.input === "number" ? u.input : 0;
|
||||
outputTokens += typeof u.output === "number" ? u.output : 0;
|
||||
totalCost += u.cost !== undefined && typeof u.cost.total === "number" ? u.cost.total : 0;
|
||||
}
|
||||
}
|
||||
emit("agent_end", { usage: seen ? { inputTokens, outputTokens, totalCost } : {} });
|
||||
});
|
||||
|
||||
sub("agent_settled", () => {
|
||||
emit("agent_settled", {});
|
||||
});
|
||||
}
|
||||
@@ -0,0 +1,182 @@
|
||||
/**
|
||||
* Dev-only minimal WebSocket "daemon" used by smoke.ts and e2e.ts.
|
||||
* Zero npm dependencies: hand-rolled WS handshake + frame codec.
|
||||
* Not covered by tsc beyond what tsconfig includes; Node type-strips it.
|
||||
*/
|
||||
|
||||
import { createHash } from "node:crypto";
|
||||
import * as http from "node:http";
|
||||
import type { AddressInfo } from "node:net";
|
||||
import type { Duplex } from "node:stream";
|
||||
|
||||
export const WS_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
|
||||
|
||||
export interface ClientFrame {
|
||||
v: number;
|
||||
sessionId: string;
|
||||
seq: number;
|
||||
ts: number;
|
||||
type: string;
|
||||
[key: string]: unknown;
|
||||
}
|
||||
|
||||
export interface MiniDaemon {
|
||||
url: string;
|
||||
frames: ClientFrame[];
|
||||
authHeaders: string[];
|
||||
connections(): number;
|
||||
pushAll(text: string): void;
|
||||
dropConnections(): void;
|
||||
close(): void;
|
||||
}
|
||||
|
||||
export function check(name: string, ok: boolean, detail = ""): void {
|
||||
if (ok) console.log(`ok ${name}`);
|
||||
else console.log(`FAIL ${name} ${detail}`);
|
||||
}
|
||||
|
||||
export function sleep(ms: number): Promise<void> {
|
||||
return new Promise((resolve) => setTimeout(resolve, ms));
|
||||
}
|
||||
|
||||
export async function waitFor(cond: () => boolean, timeoutMs: number, stepMs = 25): Promise<boolean> {
|
||||
const deadline = Date.now() + timeoutMs;
|
||||
while (Date.now() < deadline) {
|
||||
if (cond()) return true;
|
||||
await sleep(stepMs);
|
||||
}
|
||||
return cond();
|
||||
}
|
||||
|
||||
function encodeTextFrame(text: string): Buffer {
|
||||
const payload = Buffer.from(text, "utf8");
|
||||
const len = payload.length;
|
||||
let header: Buffer;
|
||||
if (len < 126) header = Buffer.from([0x81, len]);
|
||||
else if (len < 65536) {
|
||||
header = Buffer.alloc(4);
|
||||
header[0] = 0x81;
|
||||
header[1] = 126;
|
||||
header.writeUInt16BE(len, 2);
|
||||
} else {
|
||||
header = Buffer.alloc(10);
|
||||
header[0] = 0x81;
|
||||
header[1] = 127;
|
||||
header.writeBigUInt64BE(BigInt(len), 2);
|
||||
}
|
||||
return Buffer.concat([header, payload]);
|
||||
}
|
||||
|
||||
function decodeFrames(chunk: Buffer): { frames: Array<{ opcode: number; data: Buffer }>; consumed: number } {
|
||||
const frames: Array<{ opcode: number; data: Buffer }> = [];
|
||||
let offset = 0;
|
||||
while (offset + 2 <= chunk.length) {
|
||||
const opcode = chunk[offset] & 0x0f;
|
||||
const masked = (chunk[offset + 1] & 0x80) !== 0;
|
||||
let len = chunk[offset + 1] & 0x7f;
|
||||
let cursor = offset + 2;
|
||||
if (len === 126) {
|
||||
if (cursor + 2 > chunk.length) break;
|
||||
len = chunk.readUInt16BE(cursor);
|
||||
cursor += 2;
|
||||
} else if (len === 127) {
|
||||
if (cursor + 8 > chunk.length) break;
|
||||
len = Number(chunk.readBigUInt64BE(cursor));
|
||||
cursor += 8;
|
||||
}
|
||||
let mask: Buffer | null = null;
|
||||
if (masked) {
|
||||
if (cursor + 4 > chunk.length) break;
|
||||
mask = chunk.subarray(cursor, cursor + 4);
|
||||
cursor += 4;
|
||||
}
|
||||
if (cursor + len > chunk.length) break;
|
||||
let data = chunk.subarray(cursor, cursor + len);
|
||||
if (mask !== null) {
|
||||
const unmasked = Buffer.allocUnsafe(len);
|
||||
for (let i = 0; i < len; i++) unmasked[i] = data[i] ^ mask[i % 4];
|
||||
data = unmasked;
|
||||
}
|
||||
frames.push({ opcode, data });
|
||||
offset = cursor + len;
|
||||
}
|
||||
return { frames, consumed: offset };
|
||||
}
|
||||
|
||||
export function startMiniDaemon(getLastSeq: () => number): Promise<MiniDaemon> {
|
||||
const server = http.createServer();
|
||||
const sockets = new Set<Duplex>();
|
||||
const daemon: MiniDaemon = {
|
||||
url: "",
|
||||
frames: [],
|
||||
authHeaders: [],
|
||||
connections: () => sockets.size,
|
||||
pushAll(text: string) {
|
||||
const frame = encodeTextFrame(text);
|
||||
for (const s of sockets) s.write(frame);
|
||||
},
|
||||
dropConnections() {
|
||||
for (const s of sockets) s.destroy();
|
||||
sockets.clear();
|
||||
},
|
||||
close() {
|
||||
daemon.dropConnections();
|
||||
server.close();
|
||||
},
|
||||
};
|
||||
server.on("upgrade", (req: http.IncomingMessage, socket: Duplex) => {
|
||||
daemon.authHeaders.push(String(req.headers.authorization ?? ""));
|
||||
const key = String(req.headers["sec-websocket-key"] ?? "");
|
||||
const accept = createHash("sha1").update(key + WS_GUID).digest("base64");
|
||||
socket.write(
|
||||
"HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\n" +
|
||||
`Sec-WebSocket-Accept: ${accept}\r\n\r\n`,
|
||||
);
|
||||
sockets.add(socket);
|
||||
// Frames can split across TCP chunks: buffer per socket and decode only
|
||||
// complete frames, retaining the remainder for the next chunk.
|
||||
let recvBuf = Buffer.alloc(0);
|
||||
socket.on("data", (chunk: Buffer) => {
|
||||
recvBuf = Buffer.concat([recvBuf, chunk]);
|
||||
const { frames: decoded, consumed } = decodeFrames(recvBuf);
|
||||
recvBuf = recvBuf.subarray(consumed);
|
||||
for (const f of decoded) {
|
||||
if (f.opcode === 0x8) {
|
||||
// proper close handshake: echo close frame, then end the socket
|
||||
socket.write(Buffer.from([0x88, 0x02, 0x03, 0xe8]));
|
||||
socket.end();
|
||||
continue;
|
||||
}
|
||||
if (f.opcode !== 0x1) continue;
|
||||
try {
|
||||
const frame = JSON.parse(f.data.toString("utf8")) as ClientFrame;
|
||||
daemon.frames.push(frame);
|
||||
if (frame.type === "hello") {
|
||||
socket.write(
|
||||
encodeTextFrame(
|
||||
JSON.stringify({
|
||||
v: 1,
|
||||
type: "welcome",
|
||||
sessionId: frame.sessionId,
|
||||
seq: 0,
|
||||
ts: Date.now(),
|
||||
lastSeq: getLastSeq(),
|
||||
}),
|
||||
),
|
||||
);
|
||||
}
|
||||
} catch {
|
||||
// malformed client frame: ignore
|
||||
}
|
||||
}
|
||||
});
|
||||
socket.on("close", () => sockets.delete(socket));
|
||||
socket.on("error", () => sockets.delete(socket));
|
||||
});
|
||||
return new Promise((resolve) => {
|
||||
server.listen(0, "127.0.0.1", () => {
|
||||
daemon.url = `ws://127.0.0.1:${(server.address() as AddressInfo).port}/agent/ws`;
|
||||
resolve(daemon);
|
||||
});
|
||||
});
|
||||
}
|
||||
Vendored
+27
@@ -0,0 +1,27 @@
|
||||
/**
|
||||
* pi-types.d.ts exists only as a fallback when the tsconfig `paths` /
|
||||
* `typeRoots` entries cannot be resolved (pi installed elsewhere, offline
|
||||
* machine). With the bundled tsconfig, real types are used:
|
||||
*
|
||||
* - `@earendil-works/pi-coding-agent` -> pi's dist/index.d.ts (paths)
|
||||
* - node globals (fs/os/path/process/Buffer/http/...) -> @types/node
|
||||
* from pi's nested node_modules (typeRoots)
|
||||
* - global `WebSocket` is the undici one (Node >= 22) and accepts an
|
||||
* options object with `headers` for the Authorization bearer upgrade.
|
||||
*
|
||||
* If those cannot resolve, uncomment the declaration below: lvmh-agent.ts
|
||||
* only relies on `pi.on(...)` and `pi.sendUserMessage(...)`.
|
||||
*/
|
||||
|
||||
// declare module "@earendil-works/pi-coding-agent" {
|
||||
// export interface ExtensionContext {
|
||||
// cwd: string;
|
||||
// model: { id?: unknown; provider?: unknown } | undefined;
|
||||
// sessionManager: any;
|
||||
// abort(): void;
|
||||
// }
|
||||
// export interface ExtensionAPI {
|
||||
// on(event: string, handler: (event: any, ctx: ExtensionContext) => any): void;
|
||||
// sendUserMessage(content: string, options?: { deliverAs?: "steer" | "followUp" }): void;
|
||||
// }
|
||||
// }
|
||||
@@ -0,0 +1,152 @@
|
||||
# lvmh-agent selftest
|
||||
|
||||
How the "BULLETPROOF" constraints were verified for `lvmh-agent.ts`.
|
||||
Line numbers refer to `lvmh-agent.ts` in this directory.
|
||||
|
||||
## Validation runs (all executed, 2026-08-18)
|
||||
|
||||
| check | command | result |
|
||||
| --- | --- | --- |
|
||||
| Typecheck (strict, real pi types) | `npx --package typescript@5.9 tsc --noEmit -p .` in `plugin/` | **exit 0**, no errors |
|
||||
| Offline behavior vs mini-daemon | `node plugin/smoke.ts` | **25/25 ok** (run 3× consecutive, all green) |
|
||||
| Real pi end-to-end vs mini-daemon | `node plugin/e2e.ts` | **13/13 ok** (one real LLM call via `-p`) |
|
||||
| Real pi + dead host | `LVMH_URL=ws://127.0.0.1:9/agent/ws LVMH_TOKEN=x pi -e ./plugin/lvmh-agent.ts -p "Reply with exactly: ok"` | replies `ok`, **exit 0**, plugin silently retries (log only, growing backoff), stdout clean |
|
||||
|
||||
Environment: Node v26.7.0, pi 0.84.1, TypeScript 5.9.
|
||||
|
||||
## Constraint checklist
|
||||
|
||||
### 1. Never crash pi / never throw from a handler
|
||||
|
||||
Every `pi.on` subscription goes through `sub()` (L183–204): the handler body
|
||||
runs inside `try/catch`; if it returns a promise, rejections are swallowed via
|
||||
`.then(undefined, …)`; the wrapper itself always returns `undefined`. pi can
|
||||
therefore never observe a throw or an unhandled rejection from this extension,
|
||||
regardless of which of the 13 registered handlers fails (L459–617).
|
||||
|
||||
Handler-internal risk points and their guards:
|
||||
|
||||
| code path | guard |
|
||||
| --- | --- |
|
||||
| `log()` (L75–82) | `try/catch` around `fs.appendFile`; callback discards errors |
|
||||
| `nextSeq`/map/emit payload building | pure data code; `mapMessage` (L113) and `textOfContent` (L91) treat every field as `unknown` and type-check before use |
|
||||
| `enqueue`/`flush` (L206–240) | `JSON.stringify` in `try/catch` (circular args → skip frame, L224); `ws.send` in `try/catch` → treated as disconnect + reconnect scheduled (L230–236) |
|
||||
| `connect()` (L288) | constructor in `try/catch` (invalid URL → backoff, L293); all four socket callbacks (`onopen` L297, `onmessage` L312, `onclose` L325) wrap their bodies in `try/catch`; stale-socket identity guard `if (ws !== socket) return` so an old socket's late callbacks can never clobber the new socket's state |
|
||||
| `onMessage` (L382) | `JSON.parse` in `try/catch` (L385); non-object frames, wrong `v`, unknown types ignored |
|
||||
| `deliverPrompt` (L400) | `pi.sendUserMessage(..., {deliverAs:"steer"})` in `try/catch` (L406); empty or non-string message ignored; foreign `sessionId` ignored |
|
||||
| `doAbort` (L411) | `pi.abort` (if present) else `lastCtx.abort()` in `try/catch` |
|
||||
| `buildSnapshot` (L421) | all `sessionManager` reads in `try/catch` with fallbacks (L433: ctx.cwd / Date.now) |
|
||||
| `session_start` (L459) | `getSessionId()` in `try/catch`; no id ⇒ mirroring disabled for that session, no crash |
|
||||
| `session_shutdown` (L490) | `clearTimeout` and bye-send/close both in `try/catch` (L494, L500) |
|
||||
| `onWelcome` (L349) | validates `lastSeq` (`Number.isFinite`, else 0, L355); foreign-session welcome ignored (L350) |
|
||||
|
||||
That is **14 explicit `try/catch` blocks** plus the universal `sub()` wrapper.
|
||||
Static pass over every function: no code path can throw to pi; nothing
|
||||
`await`s — all I/O is fire-and-forget async (`fs.appendFile`, undici WS), so
|
||||
nothing can block or hang the event loop either. The only synchronous work is
|
||||
JSON serialization of outbound frames (bounded by message size).
|
||||
|
||||
### 2. Zero npm dependencies
|
||||
|
||||
Imports: `node:fs`, `node:os`, `node:path` (L29–31), type-only import of
|
||||
`@earendil-works/pi-coding-agent` (L33, erased at runtime), and the Node ≥ 22
|
||||
global `WebSocket` (undici). Verified by `grep import` and by the e2e run
|
||||
against real pi. `typeof WebSocket === "undefined"` guard at L156 makes the
|
||||
extension inert (not broken) on older Node.
|
||||
|
||||
### 3. Bounded queue + drop-oldest + buffer_overflow
|
||||
|
||||
- Send queue cap 1000: `enqueue()` L206–215 (`while` shift-oldest, every drop
|
||||
counted and logged).
|
||||
- Replay buffer cap 10000 (persisted-kind events only; `message_update` is
|
||||
excluded per protocol): `emit()` L241–252.
|
||||
- Drops are never silent: `droppedEvents > 0` ⇒ `emit("buffer_overflow",
|
||||
{dropped})` immediately after the next `welcome` is processed (L373–376).
|
||||
- Persisted-kind events dropped from the send queue are still in the replay
|
||||
buffer and get recovered by replay; only `message_update` deltas can be
|
||||
lost. `onWelcome` additionally filters persisted frames out of the stale
|
||||
queue before merging replay (L367–368) so replay + queue can never
|
||||
double-send an event.
|
||||
- Smoke scenario 4 proves it: 10 050 persisted events fired while
|
||||
disconnected → reconnect → `buffer_overflow {dropped: n>0}` observed on the
|
||||
wire, replay delivered, no duplicate seq.
|
||||
|
||||
### 4. WS send failures never propagate
|
||||
|
||||
`flush()` L230–236: `ws.send` in `try/catch` → log, `handleDisconnect()`,
|
||||
`scheduleReconnect()`. Same treatment in `session_shutdown` bye-send (L500).
|
||||
Proven by smoke scenario 4 (server destroys sockets under load) and e2e.
|
||||
|
||||
### 5. Reconnect: backoff + jitter, cap 30s, forever, never throws
|
||||
|
||||
`scheduleReconnect()` L274–286: `min(1000·2^attempt, 30000) + jitter[0,1000)`;
|
||||
attempt counter reset only on a successful `welcome` (L356). Timer is
|
||||
`unref()`'d (L283) so it can never keep pi's event loop alive. Dead-host run
|
||||
above shows pi fully functional with the plugin retrying silently
|
||||
(`~/.pi/lvmh-agent.log`: attempts #0,#1,#2 at ~1s/~2s/~3s spacing).
|
||||
|
||||
### 6. Log file only, console clean
|
||||
|
||||
Single sink `~/.pi/lvmh-agent.log` via `log()` L75–82 (async append, truncated
|
||||
to 500 chars/line, swallows all errors). `grep -n "console\." lvmh-agent.ts`
|
||||
returns nothing; e2e asserts the plugin adds nothing to pi's stdout
|
||||
("e2e plugin keeps stdout clean").
|
||||
|
||||
### 7. session_shutdown / unload: close, flush nothing, exit fast
|
||||
|
||||
`session_shutdown` handler L490–519: synchronous, sends best-effort
|
||||
`bye {reason:"shutdown"}` only if the socket is OPEN, `close()`s it, clears
|
||||
the timer, sets `stopped` (blocks `emit`, `connect`, `scheduleReconnect`, and
|
||||
`flush`). No flush, no awaits. Smoke scenario 6: connection count → 0, no
|
||||
reconnect for the following 2.6s. E2E: `bye` frame observed on the wire, no
|
||||
reconnect after.
|
||||
|
||||
### 8. Daemon down at startup ⇒ pi starts and runs perfectly
|
||||
|
||||
Proven twice: (a) smoke scenario 5 — factory loads against a closed port,
|
||||
handlers never throw, event loop stays responsive (100ms timer completes
|
||||
<500ms); (b) real pi run above — prompt answered, exit 0.
|
||||
|
||||
### 9. Protocol conformance details
|
||||
|
||||
- Envelope `v/sessionId/seq/ts/type` on every frame; `hello`/`bye`/`welcome`
|
||||
use `seq: 0` (L339, L505).
|
||||
- Per-session monotonic seq survives reconnects (module-level `seqCounters`,
|
||||
L70); after a process restart, the counter is pushed past `welcome.lastSeq`
|
||||
so seqs are never reused against a warm daemon (L360–364).
|
||||
- Message mapping (`mapMessage` L113): `role`, deterministic `id`
|
||||
(`role-timestamp`), concatenated `text`, `thinking` or null,
|
||||
`toolCalls[{id,name,argsJson}]`, `toolCallId` for toolResults — verified by
|
||||
smoke "2 message_end mapping" and e2e user/assistant message_end.
|
||||
- `message_update` carries only the text delta (diffed against the previously
|
||||
sent prefix, L547–556); non-prefix text (model retry) resends full text.
|
||||
- Truncation to 2000 chars for `partial` and `resultPreview` (L576, L584).
|
||||
- `agent_end.usage` sums `input`/`output`/`cost.total` across the run's
|
||||
assistant messages; omitted entirely if none had usage (L595–613).
|
||||
- Multi-session: extension instance is re-created per session bind; on
|
||||
`session_start` with a new session id the old socket/timers/queues are reset
|
||||
(L475–488) and seq counters stay per-session (module map).
|
||||
|
||||
## Known non-issues (documented, not plugin bugs)
|
||||
|
||||
- **pi print-mode exit hang**: `pi -p` with *any* extension loaded
|
||||
(reproduced with an empty noop extension, no lvmh involvement) sometimes
|
||||
does not exit after answering — a pi quirk, independent of this plugin. The
|
||||
plugin releases all of its resources on `session_shutdown` (proven by `bye`,
|
||||
socket close, and no reconnect in e2e). The e2e harness treats this as
|
||||
informational.
|
||||
- Sync flush of a large replay burst (~10k frames ≈ 1MB) takes single-digit
|
||||
milliseconds of JSON serialization; it cannot hang the loop but is the
|
||||
largest synchronous chunk the plugin can produce.
|
||||
|
||||
## Files
|
||||
|
||||
| file | role |
|
||||
| --- | --- |
|
||||
| `lvmh-agent.ts` | the extension (only file pi loads) |
|
||||
| `README.md` | install / env / behavior |
|
||||
| `tsconfig.json` | strict typecheck against real pi types (`paths`, `typeRoots`) |
|
||||
| `pi-types.d.ts` | commented minimal fallback if pi's dist types move |
|
||||
| `mini-daemon.ts` | dev-only hand-rolled WS daemon for tests |
|
||||
| `smoke.ts` | dev-only offline test (25 checks) |
|
||||
| `e2e.ts` | dev-only real-pi test (13 checks) |
|
||||
+328
@@ -0,0 +1,328 @@
|
||||
/**
|
||||
* Dev-only smoke test for lvmh-agent.ts. Not part of the shipped extension.
|
||||
*
|
||||
* Run: node plugin/smoke.ts (Node >= 23.6; older: --experimental-strip-types)
|
||||
*
|
||||
* Scenarios (full matrix in selftest.md):
|
||||
* 1. env unset -> factory inert, nothing registered
|
||||
* 2. live daemon -> bearer header, hello snapshot, mirrored events,
|
||||
* delta-only updates, message mapping, 2000-char
|
||||
* truncation, usage mapping, monotonic seq
|
||||
* 3. prompt / abort -> pi.sendUserMessage(steer) / pi.abort; foreign
|
||||
* session prompts ignored
|
||||
* 4. drop + reconnect -> replay of persisted events after welcome.lastSeq,
|
||||
* seq continuity, buffer_overflow notice after
|
||||
* queue/replay overflow
|
||||
* 5. dead host -> loads, retries, never throws, event loop responsive
|
||||
* 6. session_shutdown -> socket closed, no reconnect afterwards
|
||||
*/
|
||||
|
||||
import { check as rawCheck, sleep, waitFor, startMiniDaemon } from "./mini-daemon.ts";
|
||||
|
||||
const SESSION_ID = "sess-1";
|
||||
|
||||
let failures = 0;
|
||||
|
||||
function check(name: string, ok: boolean, detail = ""): void {
|
||||
rawCheck(name, ok, detail);
|
||||
if (!ok) failures++;
|
||||
}
|
||||
|
||||
interface FakePi {
|
||||
handlers: Map<string, (event: unknown, ctx: unknown) => unknown>;
|
||||
sentMessages: Array<{ message: string; options: unknown }>;
|
||||
aborted: number;
|
||||
on(event: string, handler: (event: unknown, ctx: unknown) => unknown): void;
|
||||
sendUserMessage(message: string, options?: unknown): void;
|
||||
abort(): void;
|
||||
}
|
||||
|
||||
function makeFakePi(): FakePi {
|
||||
return {
|
||||
handlers: new Map(),
|
||||
sentMessages: [],
|
||||
aborted: 0,
|
||||
on(event, handler) {
|
||||
this.handlers.set(event, handler);
|
||||
},
|
||||
sendUserMessage(message, options) {
|
||||
this.sentMessages.push({ message, options });
|
||||
},
|
||||
abort() {
|
||||
this.aborted++;
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
function makeFakeCtx(): unknown {
|
||||
return {
|
||||
cwd: "/work/repo",
|
||||
model: { id: "glm-5.3", provider: "zai-renaud" },
|
||||
sessionManager: {
|
||||
getSessionId: () => SESSION_ID,
|
||||
getSessionName: () => undefined,
|
||||
getCwd: () => "/work/repo",
|
||||
getHeader: () => ({ timestamp: "2024-12-03T14:00:00.000Z", id: SESSION_ID }),
|
||||
},
|
||||
};
|
||||
}
|
||||
|
||||
async function loadExtension(): Promise<(pi: unknown) => void> {
|
||||
const mod = (await import("./lvmh-agent.ts")) as { default: (pi: unknown) => void };
|
||||
return mod.default;
|
||||
}
|
||||
|
||||
async function main(): Promise<void> {
|
||||
// --- Scenario 1: env unset -> inert --------------------------------
|
||||
delete process.env.LVMH_URL;
|
||||
delete process.env.LVMH_TOKEN;
|
||||
delete process.env.LVMH_AGENT;
|
||||
delete process.env.LVMH_REPO;
|
||||
const factory = await loadExtension();
|
||||
const inertPi = makeFakePi();
|
||||
inertPi.on = ((event: string) => {
|
||||
throw new Error(`inert extension registered handler ${event}`);
|
||||
}) as FakePi["on"];
|
||||
factory(inertPi); // must not touch pi at all
|
||||
check("1 inert: no side effects on pi", true);
|
||||
|
||||
// --- Scenario 2: live daemon ---------------------------------------
|
||||
let welcomeLastSeq = 0;
|
||||
const daemon = await startMiniDaemon(() => welcomeLastSeq);
|
||||
process.env.LVMH_URL = daemon.url;
|
||||
process.env.LVMH_TOKEN = "smoke-token";
|
||||
|
||||
const pi = makeFakePi();
|
||||
factory(pi);
|
||||
const handlerNames = [
|
||||
"session_start",
|
||||
"session_shutdown",
|
||||
"session_info_changed",
|
||||
"model_select",
|
||||
"message_start",
|
||||
"message_update",
|
||||
"message_end",
|
||||
"tool_execution_start",
|
||||
"tool_execution_update",
|
||||
"tool_execution_end",
|
||||
"agent_start",
|
||||
"agent_end",
|
||||
"agent_settled",
|
||||
];
|
||||
check("2 all 13 handlers registered", handlerNames.every((n) => pi.handlers.has(n)));
|
||||
|
||||
let lastReturn: unknown = "sentinel";
|
||||
const fire = (name: string, event: unknown): void => {
|
||||
const h = pi.handlers.get(name);
|
||||
if (h === undefined) throw new Error(`missing handler ${name}`);
|
||||
lastReturn = h(event, makeFakeCtx());
|
||||
if (lastReturn instanceof Promise) lastReturn.catch(() => undefined);
|
||||
};
|
||||
|
||||
fire("session_start", { reason: "startup" });
|
||||
const helloSeen = await waitFor(() => daemon.frames.some((f) => f.type === "hello"), 5000);
|
||||
check("2 connects and sends hello", helloSeen);
|
||||
check("2 bearer auth on upgrade", daemon.authHeaders.at(-1) === "Bearer smoke-token", daemon.authHeaders.at(-1));
|
||||
|
||||
const hello = daemon.frames.find((f) => f.type === "hello");
|
||||
const hs = (hello?.session ?? {}) as Record<string, unknown>;
|
||||
check(
|
||||
"2 hello snapshot",
|
||||
hs.id === SESSION_ID &&
|
||||
hs.name === null &&
|
||||
hs.cwd === "/work/repo" &&
|
||||
hs.model === "glm-5.3" &&
|
||||
hs.provider === "zai-renaud" &&
|
||||
hs.agent === false &&
|
||||
hs.repo === null &&
|
||||
typeof hs.startedAt === "number",
|
||||
JSON.stringify(hs),
|
||||
);
|
||||
|
||||
fire("message_start", { message: { role: "assistant", content: [], timestamp: 1000 } });
|
||||
fire("message_update", { message: { role: "assistant", content: [{ type: "text", text: "Hel" }], timestamp: 1000 } });
|
||||
fire("message_update", { message: { role: "assistant", content: [{ type: "text", text: "Hello world" }], timestamp: 1000 } });
|
||||
fire("message_end", {
|
||||
message: {
|
||||
role: "assistant",
|
||||
content: [
|
||||
{ type: "thinking", thinking: "hmm" },
|
||||
{ type: "text", text: "Hello world" },
|
||||
{ type: "toolCall", id: "tc1", name: "bash", arguments: { command: "ls" } },
|
||||
],
|
||||
timestamp: 1000,
|
||||
},
|
||||
});
|
||||
await waitFor(() => daemon.frames.some((f) => f.type === "message_end"), 2000);
|
||||
|
||||
const n0 = daemon.frames.findIndex((f) => f.type === "hello");
|
||||
const mirrored = daemon.frames.slice(n0 + 1).map((f) => f.type);
|
||||
check(
|
||||
"2 mirror order",
|
||||
JSON.stringify(mirrored) === JSON.stringify(["message_start", "message_update", "message_update", "message_end"]),
|
||||
JSON.stringify(mirrored),
|
||||
);
|
||||
const deltas = daemon.frames.filter((f) => f.type === "message_update").map((f) => f.delta);
|
||||
check("2 delta-only updates", JSON.stringify(deltas) === JSON.stringify(["Hel", "lo world"]), JSON.stringify(deltas));
|
||||
|
||||
const msg = daemon.frames.find((f) => f.type === "message_end")?.message as Record<string, unknown>;
|
||||
const tc = (msg?.toolCalls as Array<Record<string, unknown>> | undefined)?.[0];
|
||||
check(
|
||||
"2 message_end mapping",
|
||||
msg?.role === "assistant" &&
|
||||
msg?.text === "Hello world" &&
|
||||
msg?.thinking === "hmm" &&
|
||||
typeof msg?.id === "string" &&
|
||||
tc?.id === "tc1" &&
|
||||
tc?.name === "bash" &&
|
||||
tc?.argsJson === '{"command":"ls"}' &&
|
||||
msg?.toolCallId === null,
|
||||
JSON.stringify(msg),
|
||||
);
|
||||
|
||||
const big = "x".repeat(3000);
|
||||
fire("agent_start", {});
|
||||
fire("tool_execution_start", { toolCallId: "tc1", toolName: "bash", args: { command: "ls" } });
|
||||
fire("tool_execution_update", { toolCallId: "tc1", toolName: "bash", partialResult: { content: [{ type: "text", text: big }] } });
|
||||
fire("tool_execution_end", { toolCallId: "tc1", toolName: "bash", isError: true, result: { content: [{ type: "text", text: big }] } });
|
||||
fire("agent_end", { messages: [{ role: "assistant", usage: { input: 10, output: 5, cost: { total: 0.25 } } }] });
|
||||
fire("agent_settled", {});
|
||||
await waitFor(() => daemon.frames.some((f) => f.type === "agent_settled"), 2000);
|
||||
|
||||
const partial = daemon.frames.find((f) => f.type === "tool_execution_update");
|
||||
const end = daemon.frames.find((f) => f.type === "tool_execution_end");
|
||||
const partialLen = (partial?.partial as string | undefined)?.length;
|
||||
const previewLen = (end?.resultPreview as string | undefined)?.length;
|
||||
check("2 partial truncated to 2000", partialLen === 2000, String(partialLen));
|
||||
check("2 resultPreview truncated + isError", previewLen === 2000 && end?.isError === true);
|
||||
const usage = daemon.frames.find((f) => f.type === "agent_end")?.usage as Record<string, number>;
|
||||
check(
|
||||
"2 agent_end usage",
|
||||
usage?.inputTokens === 10 && usage?.outputTokens === 5 && usage?.totalCost === 0.25,
|
||||
JSON.stringify(usage),
|
||||
);
|
||||
|
||||
const seqs = daemon.frames.filter((f) => f.seq > 0).map((f) => f.seq);
|
||||
check(
|
||||
"2 seq strictly monotonic",
|
||||
seqs.length > 0 && seqs.every((s, i) => i === 0 || s > seqs[i - 1]),
|
||||
JSON.stringify(seqs),
|
||||
);
|
||||
check("2 handler return values are undefined (never a promise)", lastReturn === undefined);
|
||||
|
||||
// --- Scenario 3: prompt / abort ------------------------------------
|
||||
daemon.pushAll(
|
||||
JSON.stringify({ v: 1, type: "prompt", sessionId: "other-session", seq: 0, ts: Date.now(), promptId: "p0", message: "wrong session" }),
|
||||
);
|
||||
daemon.pushAll(
|
||||
JSON.stringify({ v: 1, type: "prompt", sessionId: SESSION_ID, seq: 0, ts: Date.now(), promptId: "p1", message: "run the tests" }),
|
||||
);
|
||||
await waitFor(() => pi.sentMessages.length > 0, 2000);
|
||||
check(
|
||||
"3 prompt delivered as steer, foreign session ignored",
|
||||
pi.sentMessages.length === 1 &&
|
||||
pi.sentMessages[0].message === "run the tests" &&
|
||||
JSON.stringify(pi.sentMessages[0].options) === '{"deliverAs":"steer"}',
|
||||
JSON.stringify(pi.sentMessages),
|
||||
);
|
||||
daemon.pushAll(JSON.stringify({ v: 1, type: "abort", sessionId: SESSION_ID, seq: 0, ts: Date.now() }));
|
||||
await waitFor(() => pi.aborted > 0, 2000);
|
||||
check("3 abort calls pi.abort", pi.aborted === 1);
|
||||
|
||||
// --- Scenario 4: drop + reconnect, replay, overflow ----------------
|
||||
const seqBeforeDrop = Math.max(...daemon.frames.map((f) => f.seq));
|
||||
welcomeLastSeq = seqBeforeDrop; // daemon has everything up to the drop
|
||||
daemon.dropConnections();
|
||||
await sleep(150); // let the client notice
|
||||
fire("message_end", { message: { role: "user", content: "offline-1", timestamp: 2000 } });
|
||||
fire("message_end", { message: { role: "user", content: "offline-2", timestamp: 2001 } });
|
||||
const reconnected = await waitFor(
|
||||
() => daemon.frames.filter((f) => f.type === "hello").length >= 2,
|
||||
10000,
|
||||
);
|
||||
check("4 reconnects after drop", reconnected);
|
||||
const replayedTexts = daemon.frames
|
||||
.filter((f) => f.type === "message_end" && f.seq > seqBeforeDrop)
|
||||
.map((f) => (f.message as { text?: string }).text);
|
||||
check(
|
||||
"4 buffered events replayed after welcome.lastSeq",
|
||||
replayedTexts.includes("offline-1") && replayedTexts.includes("offline-2"),
|
||||
JSON.stringify(replayedTexts),
|
||||
);
|
||||
const allSeqs = daemon.frames.filter((f) => f.seq > 0).map((f) => f.seq);
|
||||
const dupCount = allSeqs.length - new Set(allSeqs).size;
|
||||
check("4 no duplicate seq delivery", dupCount === 0, `duplicates: ${dupCount}`);
|
||||
const seqsAfter = daemon.frames.filter((f) => f.seq > seqBeforeDrop).map((f) => f.seq);
|
||||
check(
|
||||
"4 seq continues monotonically across reconnect",
|
||||
seqsAfter.length >= 2 && seqsAfter.every((s, i) => i === 0 || s > seqsAfter[i - 1]),
|
||||
JSON.stringify(seqsAfter),
|
||||
);
|
||||
|
||||
// overflow both bounded buffers, then reconnect once more
|
||||
const seqBeforeOverflow = Math.max(...daemon.frames.map((f) => f.seq));
|
||||
welcomeLastSeq = seqBeforeOverflow;
|
||||
daemon.dropConnections();
|
||||
await sleep(150);
|
||||
for (let i = 0; i < 10050; i++) {
|
||||
fire("agent_settled", {}); // persisted kind: fills replay buffer + send queue
|
||||
}
|
||||
const reconnected2 = await waitFor(
|
||||
() => daemon.frames.filter((f) => f.type === "hello").length >= 3,
|
||||
15000,
|
||||
);
|
||||
check("4 reconnects after overflow window", reconnected2);
|
||||
const overflowNotice = await waitFor(
|
||||
() => daemon.frames.some((f) => f.type === "buffer_overflow"),
|
||||
5000,
|
||||
);
|
||||
const overflow = daemon.frames.find((f) => f.type === "buffer_overflow");
|
||||
check(
|
||||
"4 buffer_overflow notice after drops",
|
||||
overflowNotice && typeof (overflow?.dropped as number) === "number" && (overflow?.dropped as number) > 0,
|
||||
JSON.stringify(overflow ?? null),
|
||||
);
|
||||
|
||||
// --- Scenario 6: session_shutdown ----------------------------------
|
||||
const helloCountAtShutdown = daemon.frames.filter((f) => f.type === "hello").length;
|
||||
fire("session_shutdown", { reason: "quit" });
|
||||
const closed = await waitFor(() => daemon.connections() === 0, 3000);
|
||||
check("6 shutdown closes connection", closed);
|
||||
await sleep(2600); // longer than one backoff attempt (~1-2s)
|
||||
const helloCountAfter = daemon.frames.filter((f) => f.type === "hello").length;
|
||||
check("6 no reconnect after shutdown", helloCountAfter === helloCountAtShutdown);
|
||||
|
||||
daemon.close();
|
||||
|
||||
// --- Scenario 5: dead host -----------------------------------------
|
||||
const deadDaemon = await startMiniDaemon(() => 0);
|
||||
const deadUrl = deadDaemon.url;
|
||||
deadDaemon.close(); // port now closed
|
||||
await sleep(100);
|
||||
process.env.LVMH_URL = deadUrl;
|
||||
const pi2 = makeFakePi();
|
||||
factory(pi2);
|
||||
pi2.handlers.get("session_start")?.({ reason: "startup" }, makeFakeCtx());
|
||||
await sleep(400);
|
||||
const t0 = Date.now();
|
||||
await sleep(100);
|
||||
const loopResponsive = Date.now() - t0 < 500;
|
||||
check("5 dead host: pi loads, event loop responsive", loopResponsive);
|
||||
let threw = false;
|
||||
try {
|
||||
pi2.handlers.get("message_end")?.({ message: { role: "user", content: "hi", timestamp: 1 } }, makeFakeCtx());
|
||||
} catch {
|
||||
threw = true;
|
||||
}
|
||||
check("5 dead host: handlers never throw", !threw);
|
||||
|
||||
delete process.env.LVMH_URL;
|
||||
delete process.env.LVMH_TOKEN;
|
||||
console.log(failures === 0 ? "\nALL CHECKS PASSED" : `\n${failures} CHECK(S) FAILED`);
|
||||
process.exit(failures === 0 ? 0 : 1);
|
||||
}
|
||||
|
||||
main().catch((err: unknown) => {
|
||||
console.error("smoke harness crashed:", err);
|
||||
process.exit(1);
|
||||
});
|
||||
@@ -0,0 +1,22 @@
|
||||
{
|
||||
"compilerOptions": {
|
||||
"target": "es2022",
|
||||
"module": "esnext",
|
||||
"moduleResolution": "bundler",
|
||||
"lib": ["es2023"],
|
||||
"types": ["node"],
|
||||
"typeRoots": [
|
||||
"/home/raph/.node/lib/node_modules/@earendil-works/pi-coding-agent/node_modules/@types"
|
||||
],
|
||||
"allowImportingTsExtensions": true,
|
||||
"strict": true,
|
||||
"noEmit": true,
|
||||
"skipLibCheck": true,
|
||||
"paths": {
|
||||
"@earendil-works/pi-coding-agent": [
|
||||
"/home/raph/.node/lib/node_modules/@earendil-works/pi-coding-agent/dist/index.d.ts"
|
||||
]
|
||||
}
|
||||
},
|
||||
"include": ["lvmh-agent.ts", "smoke.ts", "mini-daemon.ts", "e2e.ts", "pi-types.d.ts"]
|
||||
}
|
||||
Reference in New Issue
Block a user