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Garry Tan
e3c235ae5c
design/src/daemon-client.ts implements the CLI side of the daemon lifecycle:
ensureDaemon() (the spawn-or-attach decision), publishBoard(), and the
$D daemon stop|status helpers.
Modeled on browse/src/cli.ts:317-415 — same health-check-first attach,
same fs.openSync('wx') lock, same re-read-state-INSIDE-the-lock guard
against two CLIs both deciding "no daemon, spawn." Two design-specific
safety properties added beyond browse:
1. verifyIdentity before any SIGTERM/SIGKILL. Reads the running process's
cmdline (/proc/PID/cmdline on Linux, `ps -p PID -o command=` on macOS)
and only signals if it contains CMDLINE_MARKER ("gstack-design-daemon",
passed as argv at spawn time). Prevents a stale state file from
causing us to kill an unrelated process that inherited the PID.
2. Refuse-kill-with-active-boards on version mismatch. Browse silently
restarts; here in-memory board history would vanish, so the client
prints a user-actionable WARNING and exit 1 instead. Users explicitly
`$D daemon stop` to override.
Spawn uses Node child_process.spawn (NOT Bun.spawn().unref) because of
the macOS session-detach quirks browse already discovered. Stdio is
redirected to ~/.gstack/design-daemon-startup.log, which the client
tails into stderr if waitForHealthOrError times out — no more silent
"daemon failed for some unknowable reason."
daemon-state.ts gains DESIGN_DAEMON_STATE_FILE env override so tests
can point both client and spawned daemon at a per-test path without a
shared cwd.
design/test/daemon-discovery.test.ts: 17 tests, all green in ~8s. Covers:
spawn-fresh, attach-existing, stale-state-file (pid dead), PID-reuse
safety (uses the test runner's own PID as the bait — verifyIdentity
catches the cmdline mismatch, daemon not signaled), version-mismatch
with/without active boards (the active-boards case runs a subprocess
and asserts exit 1 + WARNING in stderr), publishBoard 200 + 409,
shutdownDaemon refuse/force/unresponsive paths, daemonStatus.
The daemon-discovery suite is split out of daemon.test.ts because each
real spawn costs ~200ms; the in-process daemon.test.ts (30 tests, 70ms)
covers the same handler logic without the spawn overhead.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
136 lines
4.2 KiB
TypeScript
136 lines
4.2 KiB
TypeScript
/**
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* Shared helpers for daemon + daemon-client tests.
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*
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* Two test styles live here:
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* - In-process: import fetchHandler from daemon.ts and call it with a
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* synthesized Request. Fast, no spawn, no HTTP. Covers routing +
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* handler semantics. Used by most of daemon.test.ts.
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* - Out-of-process: spawn `bun run design/src/daemon.ts` with a tmp
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* state file + env overrides, then HTTP against the bound port.
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* Slow but only path that proves real spawn + state file + signal
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* handling work. Used by daemon-discovery.test.ts.
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*/
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import { spawn, type ChildProcess } from "child_process";
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import fs from "fs";
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import os from "os";
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import path from "path";
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import { __testInternals__ } from "../src/daemon";
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export const DAEMON_SCRIPT = path.join(import.meta.dir, "..", "src", "daemon.ts");
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export function makeTmpDir(prefix = "design-daemon-test"): string {
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return fs.mkdtempSync(path.join(os.tmpdir(), `${prefix}-`));
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}
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export function makeBoardHtml(tmpDir: string, body = "<p>Test board</p>"): string {
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const p = path.join(tmpDir, "design-board.html");
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fs.writeFileSync(
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p,
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`<!DOCTYPE html><html><head></head><body>${body}</body></html>`,
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);
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return p;
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}
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/** Reset the in-process daemon state between tests. */
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export function resetDaemon(): void {
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__testInternals__.resetForTest();
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}
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/** Build a Request for the in-process fetchHandler tests. */
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export function req(method: string, urlPath: string, body?: unknown): Request {
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const init: RequestInit = { method };
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if (body !== undefined) {
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init.body = typeof body === "string" ? body : JSON.stringify(body);
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init.headers = { "Content-Type": "application/json" };
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}
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return new Request(`http://127.0.0.1:1234${urlPath}`, init);
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}
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export interface SpawnedDaemon {
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proc: ChildProcess;
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port: number;
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stateFile: string;
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stop: () => Promise<void>;
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}
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/**
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* Spawn a real daemon process pointed at a per-test state file, with an
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* aggressive idle window so idle-shutdown tests don't take 24h. Resolves
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* when stdout emits `DAEMON_STARTED port=<N>`.
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*/
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export async function spawnDaemonForTest(
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opts: { stateFile?: string; idleMs?: number; checkMs?: number; env?: Record<string, string> } = {},
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): Promise<SpawnedDaemon> {
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const stateFile = opts.stateFile ?? path.join(makeTmpDir("daemon-state"), "design.json");
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const env: Record<string, string> = {
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...(process.env as Record<string, string>),
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// DESIGN_DAEMON_STATE_FILE points both daemon and any same-process
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// discovery at this test's state file (overrides resolveStateFilePath).
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DESIGN_DAEMON_STATE_FILE: stateFile,
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DESIGN_DAEMON_IDLE_MS: String(opts.idleMs ?? 60_000),
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DESIGN_DAEMON_CHECK_MS: String(opts.checkMs ?? 1000),
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DESIGN_DAEMON_VERSION: "test-version",
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...(opts.env ?? {}),
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};
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// Spawn with a marker in argv so cmdline-based identity verification
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// exercises the real CMDLINE_MARKER ("gstack-design-daemon").
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const proc = spawn(
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"bun",
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["run", DAEMON_SCRIPT, "--marker", "gstack-design-daemon"],
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{
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env,
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stdio: ["ignore", "pipe", "pipe"],
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cwd: path.dirname(stateFile),
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},
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);
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const port = await new Promise<number>((resolve, reject) => {
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const onTimeout = setTimeout(() => {
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proc.kill("SIGKILL");
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reject(new Error("Daemon failed to emit DAEMON_STARTED within 5s"));
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}, 5000);
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proc.stdout!.on("data", (chunk: Buffer) => {
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const line = chunk.toString();
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const m = line.match(/DAEMON_STARTED port=(\d+)/);
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if (m) {
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clearTimeout(onTimeout);
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resolve(parseInt(m[1]!, 10));
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}
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});
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proc.on("error", (e) => {
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clearTimeout(onTimeout);
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reject(e);
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});
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proc.on("exit", (code) => {
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clearTimeout(onTimeout);
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reject(new Error(`Daemon exited early with code ${code}`));
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});
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});
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return {
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proc,
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port,
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stateFile,
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stop: async () => {
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proc.kill("SIGTERM");
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await new Promise<void>((r) => {
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const t = setTimeout(() => {
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try {
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proc.kill("SIGKILL");
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} catch {
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// gone
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}
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r();
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}, 2000);
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proc.on("exit", () => {
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clearTimeout(t);
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r();
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});
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});
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},
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};
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}
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