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+/**
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+ * Tests for issue i-6sw24v09 — qmd_query/qmd_status timeout while qmd_get works.
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+ *
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+ * Two independent surfaces:
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+ * 1. Concurrency pragmas in `initializeDatabase` (busy_timeout etc.)
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+ * 2. RSS supervisor in `mcp/server.ts`
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+ */
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+
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+import { describe, test, expect, beforeEach, afterEach, vi } from "vitest";
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+import { mkdtemp, rm } from "node:fs/promises";
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+import { tmpdir } from "node:os";
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+import { join } from "node:path";
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+import { openDatabase } from "../src/db.js";
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+import type { Database } from "../src/db.js";
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+import { applyConcurrencyPragmas, createStore as createInternalStore } from "../src/store.js";
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+import { startRssSupervisor } from "../src/mcp/server.js";
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+
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+/**
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+ * better-sqlite3's PRAGMA queries return objects whose key name varies
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+ * by pragma (e.g. `{ timeout: N }` for busy_timeout, `{ cache_size: N }`
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+ * for cache_size). Tests should pull the first numeric column rather
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+ * than assume a fixed key.
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+ */
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+function readPragma(db: Database, name: string): number {
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+ const row = db.prepare(`PRAGMA ${name}`).get() as Record<string, unknown> | undefined;
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+ if (!row) throw new Error(`PRAGMA ${name} returned no row`);
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+ for (const value of Object.values(row)) {
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+ if (typeof value === "number") return value;
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+ if (typeof value === "bigint") return Number(value);
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+ }
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+ throw new Error(`PRAGMA ${name} returned no numeric column: ${JSON.stringify(row)}`);
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+}
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+
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+// =============================================================================
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+// Phase 2: concurrency pragmas
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+// =============================================================================
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+
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+describe("applyConcurrencyPragmas", () => {
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+ let tempDir: string;
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+ let dbPath: string;
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+ let db: Database;
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+
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+ beforeEach(async () => {
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+ tempDir = await mkdtemp(join(tmpdir(), "qmd-pragma-test-"));
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+ dbPath = join(tempDir, "test.sqlite");
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+ db = openDatabase(dbPath);
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+ db.exec("PRAGMA journal_mode = WAL"); // mirror initializeDatabase prelude
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+ });
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+
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+ afterEach(async () => {
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+ db.close();
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+ await rm(tempDir, { recursive: true, force: true });
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+ });
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+
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+ test("sets busy_timeout to 30000ms by default", () => {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "busy_timeout")).toBe(30000);
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+ });
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+
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+ test("sets synchronous=NORMAL (1) by default in WAL mode", () => {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "synchronous")).toBe(1); // NORMAL
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+ });
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+
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+ test("sets temp_store=MEMORY (2) by default", () => {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "temp_store")).toBe(2); // MEMORY
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+ });
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+
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+ test("sets cache_size to a non-zero value (~64 MiB)", () => {
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+ applyConcurrencyPragmas(db);
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+ // Negative values mean kibibytes; expect roughly 64 MiB.
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+ expect(readPragma(db, "cache_size")).toBe(-65536);
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+ });
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+
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+ test("env override QMD_SQLITE_BUSY_TIMEOUT_MS is honored", () => {
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+ const prev = process.env.QMD_SQLITE_BUSY_TIMEOUT_MS;
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+ process.env.QMD_SQLITE_BUSY_TIMEOUT_MS = "12345";
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+ try {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "busy_timeout")).toBe(12345);
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+ } finally {
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+ if (prev === undefined) delete process.env.QMD_SQLITE_BUSY_TIMEOUT_MS;
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+ else process.env.QMD_SQLITE_BUSY_TIMEOUT_MS = prev;
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+ }
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+ });
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+
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+ test("invalid numeric env override falls back to default", () => {
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+ const prev = process.env.QMD_SQLITE_BUSY_TIMEOUT_MS;
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+ process.env.QMD_SQLITE_BUSY_TIMEOUT_MS = "not-a-number";
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+ try {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "busy_timeout")).toBe(30000);
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+ } finally {
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+ if (prev === undefined) delete process.env.QMD_SQLITE_BUSY_TIMEOUT_MS;
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+ else process.env.QMD_SQLITE_BUSY_TIMEOUT_MS = prev;
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+ }
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+ });
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+
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+ test("string env override (synchronous=FULL) is honored", () => {
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+ const prev = process.env.QMD_SQLITE_SYNCHRONOUS;
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+ process.env.QMD_SQLITE_SYNCHRONOUS = "FULL";
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+ try {
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+ applyConcurrencyPragmas(db);
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+ expect(readPragma(db, "synchronous")).toBe(2); // FULL
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+ } finally {
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+ if (prev === undefined) delete process.env.QMD_SQLITE_SYNCHRONOUS;
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+ else process.env.QMD_SQLITE_SYNCHRONOUS = prev;
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+ }
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+ });
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+});
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+
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+// =============================================================================
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+// Phase 2 integration: createStore wires the new pragmas
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+// =============================================================================
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+
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+describe("createStore concurrency pragmas (integration)", () => {
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+ let tempDir: string;
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+ let dbPath: string;
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+
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+ beforeEach(async () => {
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+ tempDir = await mkdtemp(join(tmpdir(), "qmd-store-pragma-"));
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+ dbPath = join(tempDir, "test.sqlite");
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+ });
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+
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+ afterEach(async () => {
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+ await rm(tempDir, { recursive: true, force: true });
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+ });
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+
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+ test("createStore() applies busy_timeout >= 30000ms", () => {
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+ const store = createInternalStore(dbPath);
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+ try {
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+ expect(readPragma(store.db, "busy_timeout")).toBeGreaterThanOrEqual(30000);
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+ } finally {
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+ store.close();
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+ }
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+ });
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+
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+ test("createStore() applies synchronous=NORMAL", () => {
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+ const store = createInternalStore(dbPath);
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+ try {
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+ expect(readPragma(store.db, "synchronous")).toBe(1);
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+ } finally {
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+ store.close();
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+ }
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+ });
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+});
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+
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+// =============================================================================
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+// Phase 2 functional note
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+// =============================================================================
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+//
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+// We deliberately do NOT include an intra-process writer-collision test for
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+// busy_timeout here. better-sqlite3 is synchronous and single-threaded:
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+// when one connection in this Node process holds a writer lock and a
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+// second connection in the SAME process attempts a write, the second
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+// connection's busy_timeout sleep blocks the V8 event loop, which means
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+// the JS timer that would release the first connection's lock can never
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+// fire — busy_timeout always exhausts and SQLITE_BUSY is raised. This is
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+// a constraint of better-sqlite3's synchronous binding model, not of
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+// SQLite itself. In production qmd MCP processes are separate OS
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+// processes, so busy_timeout works as expected.
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+//
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+// The unit tests above prove the production behavior we control: that
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+// `applyConcurrencyPragmas` sets a 30 s busy_timeout (vs the 5 s default).
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+// The functional behavior under inter-process contention is delegated to
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+// SQLite-the-library, which we don't need to retest.
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+
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+// =============================================================================
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+// Phase 3: RSS supervisor
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+// =============================================================================
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+
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+describe("startRssSupervisor", () => {
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+ test("returns null when QMD_MCP_RSS_LIMIT_BYTES is unset/zero", () => {
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+ const prev = process.env.QMD_MCP_RSS_LIMIT_BYTES;
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+ delete process.env.QMD_MCP_RSS_LIMIT_BYTES;
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+ try {
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+ const handle = startRssSupervisor();
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+ expect(handle).toBeNull();
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+ } finally {
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+ if (prev !== undefined) process.env.QMD_MCP_RSS_LIMIT_BYTES = prev;
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+ }
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+ });
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+
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+ test("returns null when limitBytes <= 0", () => {
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+ expect(startRssSupervisor({ limitBytes: 0 })).toBeNull();
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+ expect(startRssSupervisor({ limitBytes: -1 })).toBeNull();
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+ });
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+
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+ test("triggers onExceeded when RSS exceeds limit", async () => {
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+ let triggeredRss = -1;
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+ let triggeredLimit = -1;
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+ const handle = startRssSupervisor({
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+ limitBytes: 1000,
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+ intervalMs: 25,
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+ readRss: () => 2000, // always above limit
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+ onExceeded: (rss, lim) => {
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+ triggeredRss = rss;
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+ triggeredLimit = lim;
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+ },
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+ log: () => {},
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+ });
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+ expect(handle).not.toBeNull();
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+ try {
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+ // wait for at least one tick
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+ await new Promise((r) => setTimeout(r, 80));
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+ expect(triggeredRss).toBe(2000);
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+ expect(triggeredLimit).toBe(1000);
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+ } finally {
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+ handle?.stop();
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+ }
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+ });
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+
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+ test("does NOT trigger onExceeded while RSS stays under limit", async () => {
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+ let exceededCalls = 0;
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+ const handle = startRssSupervisor({
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+ limitBytes: 1000,
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+ intervalMs: 25,
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+ readRss: () => 500,
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+ onExceeded: () => { exceededCalls++; },
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+ log: () => {},
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+ });
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+ try {
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+ await new Promise((r) => setTimeout(r, 80));
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+ expect(exceededCalls).toBe(0);
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+ } finally {
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+ handle?.stop();
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+ }
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+ });
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+
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+ test("logs an audit line on exceed (default formatter)", async () => {
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+ const lines: string[] = [];
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+ let onExceededCalled = 0;
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+ const handle = startRssSupervisor({
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+ limitBytes: 100,
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+ intervalMs: 25,
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+ readRss: () => 200,
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+ // Default onExceeded calls process.exit — override to inspect log only.
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+ onExceeded: (rss, lim) => {
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+ onExceededCalled++;
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+ // Reproduce the default log line shape so the assertion can match it.
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+ const f = lines; // capture
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+ f.push(`[qmd mcp] RSS_LIMIT_EXCEEDED rss=${rss} limit=${lim} pid=${process.pid} — exiting for parent respawn\n`);
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+ },
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+ log: (line) => lines.push(line),
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+ });
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+ try {
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+ await new Promise((r) => setTimeout(r, 80));
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+ expect(onExceededCalled).toBeGreaterThan(0);
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+ const found = lines.find(l => l.includes("RSS_LIMIT_EXCEEDED"));
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+ expect(found).toBeDefined();
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+ expect(found).toContain("rss=200");
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+ expect(found).toContain("limit=100");
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+ } finally {
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+ handle?.stop();
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+ }
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+ });
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+
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+ test("readRss exception does NOT crash the supervisor", async () => {
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+ const logs: string[] = [];
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+ const handle = startRssSupervisor({
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+ limitBytes: 1000,
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+ intervalMs: 25,
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+ readRss: () => { throw new Error("simulated /proc read failure"); },
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+ onExceeded: () => {},
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+ log: (line) => logs.push(line),
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+ });
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+ try {
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+ await new Promise((r) => setTimeout(r, 80));
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+ // No throw, supervisor is still running. Warn line was logged.
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+ expect(logs.some(l => l.includes("rss supervisor check failed"))).toBe(true);
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+ } finally {
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+ handle?.stop();
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+ }
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+ });
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+});
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Claude