feat(codex-lsp): lazy-start mcp backend

2026-05-29 12:18:24 +09:00
parent 5030a116f3
commit 4bf9095456
14 changed files with 1013 additions and 10 deletions
@@ -0,0 +1,54 @@
+import { describe, expect, it } from "vitest";
+
+import { createStdioLazyMcpBackend } from "../src/lazy-mcp-stdio-backend.js";
+
+describe("stdio lazy MCP backend", () => {
+	it("#given backend stdio stays open after parent exit #when stopped #then stop resolves on process exit", async () => {
+		// given
+		const backend = createStdioLazyMcpBackend({
+			command: process.execPath,
+			args: ["-e", delayedStdioCloseScript()],
+		});
+		const connection = await backend.start();
+
+		// when
+		const result = await Promise.race([connection.stop().then(() => "stopped"), failAfter(300)]);
+
+		// then
+		expect(result).toBe("stopped");
+	});
+
+	it("#given backend ignores SIGTERM #when stopped #then stop escalates and resolves", async () => {
+		// given
+		const backend = createStdioLazyMcpBackend({
+			command: process.execPath,
+			args: ["-e", ignoreSigtermScript()],
+		});
+		const connection = await backend.start();
+
+		// when
+		const result = await Promise.race([connection.stop().then(() => "stopped"), failAfter(1_500)]);
+
+		// then
+		expect(result).toBe("stopped");
+	});
+});
+
+function delayedStdioCloseScript(): string {
+	return [
+		'const { spawn } = require("node:child_process");',
+		'const grandchild = spawn(process.execPath, ["-e", "setTimeout(() => process.exit(0), 1500); setInterval(() => {}, 1000)"], { stdio: ["ignore", "inherit", "inherit"] });',
+		'process.on("SIGTERM", () => process.exit(0));',
+		"setInterval(() => {}, 1000);",
+	].join("");
+}
+
+function ignoreSigtermScript(): string {
+	return ['process.on("SIGTERM", () => {});', "setInterval(() => {}, 1000);"].join("");
+}
+
+function failAfter(delayMs: number): Promise<string> {
+	return new Promise((resolve) => {
+		setTimeout(() => resolve("timeout"), delayMs);
+	});
+}