src/gateway/client.test.ts

import { createServer } from "node:net";
import { createServer as createHttpsServer } from "node:https";
import { afterEach, describe, expect, test } from "vitest";
import { WebSocketServer } from "ws";
import { rawDataToString } from "../infra/ws.js";
import { GatewayClient } from "./client.js";

// Find a free localhost port for ad-hoc WS servers.
async function getFreePort(): Promise<number> {
  return await new Promise((resolve, reject) => {
    const server = createServer();
    server.listen(0, "127.0.0.1", () => {
      const port = (server.address() as { port: number }).port;
      server.close((err) => (err ? reject(err) : resolve(port)));
    });
  });
}

describe("GatewayClient", () => {
  let wss: WebSocketServer | null = null;
  let httpsServer: ReturnType<typeof createHttpsServer> | null = null;

  afterEach(async () => {
    if (wss) {
      for (const client of wss.clients) {
        client.terminate();
      }
      await new Promise<void>((resolve) => wss?.close(() => resolve()));
      wss = null;
    }
    if (httpsServer) {
      httpsServer.closeAllConnections?.();
      httpsServer.closeIdleConnections?.();
      await new Promise<void>((resolve) => httpsServer?.close(() => resolve()));
      httpsServer = null;
    }
  });

  test("closes on missing ticks", async () => {
    const port = await getFreePort();
    wss = new WebSocketServer({ port, host: "127.0.0.1" });

    wss.on("connection", (socket) => {
      socket.once("message", (data) => {
        const first = JSON.parse(rawDataToString(data)) as { id?: string };
        const id = first.id ?? "connect";
        // Respond with tiny tick interval to trigger watchdog quickly.
        const helloOk = {
          type: "hello-ok",
          protocol: 2,
          server: { version: "dev", connId: "c1" },
          features: { methods: [], events: [] },
          snapshot: {
            presence: [],
            health: {},
            stateVersion: { presence: 1, health: 1 },
            uptimeMs: 1,
          },
          policy: {
            maxPayload: 512 * 1024,
            maxBufferedBytes: 1024 * 1024,
            tickIntervalMs: 5,
          },
        };
        socket.send(JSON.stringify({ type: "res", id, ok: true, payload: helloOk }));
      });
    });

    const closed = new Promise<{ code: number; reason: string }>((resolve) => {
      const client = new GatewayClient({
        url: `ws://127.0.0.1:${port}`,
        onClose: (code, reason) => resolve({ code, reason }),
      });
      client.start();
    });

    const res = await closed;
    expect(res.code).toBe(4000);
    expect(res.reason).toContain("tick timeout");
  }, 4000);

  test("rejects mismatched tls fingerprint", async () => {
    const key = `-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----`;
    const cert = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`;

    httpsServer = createHttpsServer({ key, cert });
    wss = new WebSocketServer({ server: httpsServer, maxPayload: 1024 * 1024 });
    const port = await new Promise<number>((resolve, reject) => {
      httpsServer?.once("error", reject);
      httpsServer?.listen(0, "127.0.0.1", () => {
        const address = httpsServer?.address();
        if (!address || typeof address === "string") {
          reject(new Error("https server address unavailable"));
          return;
        }
        resolve(address.port);
      });
    });

    let client: GatewayClient | null = null;
    const error = await new Promise<Error>((resolve) => {
      let settled = false;
      const finish = (err: Error) => {
        if (settled) {
          return;
        }
        settled = true;
        resolve(err);
      };
      const timeout = setTimeout(() => {
        client?.stop();
        finish(new Error("timeout waiting for tls error"));
      }, 2000);
      client = new GatewayClient({
        url: `wss://127.0.0.1:${port}`,
        tlsFingerprint: "deadbeef",
        onConnectError: (err) => {
          clearTimeout(timeout);
          client?.stop();
          finish(err);
        },
        onClose: () => {
          clearTimeout(timeout);
          client?.stop();
          finish(new Error("closed without tls error"));
        },
      });
      client.start();
    });

    expect(String(error)).toContain("tls fingerprint mismatch");
  });
});