paseo/packages/server/src/server/websocket-server.relay-reconnect.test.ts

import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
import {
  asUint8Array,
  decodeTerminalStreamFrame,
  encodeTerminalStreamFrame,
  TerminalStreamOpcode,
} from "../shared/terminal-stream-protocol.js";

const wsModuleMock = vi.hoisted(() => {
  class MockWebSocketServer {
    static instances: MockWebSocketServer[] = [];
    readonly handlers = new Map<string, (...args: any[]) => void>();

    constructor(_options: unknown) {
      MockWebSocketServer.instances.push(this);
    }

    on(event: string, handler: (...args: any[]) => void) {
      this.handlers.set(event, handler);
      return this;
    }

    close() {
      // no-op
    }
  }

  return { MockWebSocketServer };
});

const sessionMock = vi.hoisted(() => {
  const instances: MockSession[] = [];

  class MockSession {
    cleanup = vi.fn(async () => {});
    handleMessage = vi.fn(async () => {});
    handleBinaryFrame = vi.fn((_frame: unknown) => {});
    getClientActivity = vi.fn(() => null);
    resetPeakInflight = vi.fn(() => {});
    getRuntimeMetrics = vi.fn(() => ({
      checkoutDiffTargetCount: 0,
      checkoutDiffSubscriptionCount: 0,
      checkoutDiffWatcherCount: 0,
      checkoutDiffFallbackRefreshTargetCount: 0,
      terminalDirectorySubscriptionCount: 0,
      terminalSubscriptionCount: 0,
      inflightRequests: 0,
      peakInflightRequests: 0,
    }));
    readonly args: Record<string, unknown>;

    constructor(args: Record<string, unknown>) {
      this.args = args;
      instances.push(this);
    }
  }

  return { MockSession, instances };
});

vi.mock("ws", () => ({
  WebSocketServer: wsModuleMock.MockWebSocketServer,
}));

vi.mock("./session.js", () => ({
  Session: sessionMock.MockSession,
}));

vi.mock("./push/token-store.js", () => ({
  PushTokenStore: class {
    getAllTokens(): string[] {
      return [];
    }
  },
}));

vi.mock("./push/push-service.js", () => ({
  PushService: class {
    async sendPush(): Promise<void> {
      // no-op
    }
  },
}));

import { VoiceAssistantWebSocketServer } from "./websocket-server";
import { parseServerInfoStatusPayload } from "./messages.js";
import type { SpeechReadinessSnapshot } from "./speech/speech-runtime.js";

const TEST_DAEMON_VERSION = "1.2.3-test";

class MockSocket {
  readyState = 1;
  bufferedAmount = 0;
  sent: unknown[] = [];
  private listeners = new Map<string, Array<(...args: any[]) => void>>();

  on(event: "message" | "close" | "error", listener: (...args: any[]) => void): void {
    const handlers = this.listeners.get(event) ?? [];
    handlers.push(listener);
    this.listeners.set(event, handlers);
  }

  once(event: "close" | "error", listener: (...args: any[]) => void): void {
    const wrapped = (...args: any[]) => {
      this.off(event, wrapped);
      listener(...args);
    };
    this.on(event, wrapped);
  }

  send(data: unknown): void {
    this.sent.push(data);
  }

  close(code?: number, reason?: string): void {
    this.readyState = 3;
    this.emit("close", code ?? 1000, reason ?? "");
  }

  emit(event: "message" | "close" | "error", ...args: any[]): void {
    const handlers = this.listeners.get(event) ?? [];
    for (const handler of [...handlers]) {
      handler(...args);
    }
  }

  private off(event: "close" | "error", listener: (...args: any[]) => void): void {
    const handlers = this.listeners.get(event) ?? [];
    this.listeners.set(
      event,
      handlers.filter((handler) => handler !== listener),
    );
  }
}

function createLogger() {
  const logger = {
    child: vi.fn(() => logger),
    trace: vi.fn(),
    debug: vi.fn(),
    info: vi.fn(),
    warn: vi.fn(),
    error: vi.fn(),
  };
  return logger;
}

function createServer(options?: { speechReadiness?: SpeechReadinessSnapshot | null }) {
  const speechReadiness = options?.speechReadiness ?? null;
  return new VoiceAssistantWebSocketServer(
    {} as any,
    createLogger() as any,
    "srv_test",
    {
      setAgentAttentionCallback: vi.fn(),
      getAgent: vi.fn(() => null),
      getMetricsSnapshot: vi.fn(() => ({
        totalAgents: 0,
        idleAgents: 0,
        runningAgents: 0,
        pendingPermissionAgents: 0,
        erroredAgents: 0,
      })),
    } as any,
    {} as any,
    {} as any,
    "/tmp/paseo-test",
    null,
    { allowedOrigins: new Set() },
    speechReadiness
      ? {
          getReadiness: () => speechReadiness,
          onReadinessChange: vi.fn(() => () => {}),
        }
      : undefined,
    undefined,
    undefined,
    undefined,
    TEST_DAEMON_VERSION,
    undefined,
    undefined,
    undefined,
    {} as any,
    {} as any,
    {} as any,
    {
      subscribe: vi.fn(),
      scheduleRefreshForCwd: vi.fn(),
      getMetrics: vi.fn(() => ({
        checkoutDiffTargetCount: 0,
        checkoutDiffSubscriptionCount: 0,
        checkoutDiffWatcherCount: 0,
        checkoutDiffFallbackRefreshTargetCount: 0,
      })),
      dispose: vi.fn(),
    } as any,
  );
}

function createReadySpeechReadinessSnapshot(): SpeechReadinessSnapshot {
  return {
    generatedAt: "2026-02-14T00:00:00.000Z",
    requiredLocalModelIds: [],
    missingLocalModelIds: [],
    download: {
      inProgress: false,
      error: null,
    },
    dictation: {
      enabled: true,
      available: true,
      reasonCode: "ready",
      message: "Dictation is ready.",
      retryable: false,
      missingModelIds: [],
    },
    realtimeVoice: {
      enabled: true,
      available: true,
      reasonCode: "ready",
      message: "Realtime voice is ready.",
      retryable: false,
      missingModelIds: [],
    },
    voiceFeature: {
      enabled: true,
      available: true,
      reasonCode: "ready",
      message: "Voice features are ready.",
      retryable: false,
      missingModelIds: [],
    },
  };
}

function createDownloadInProgressSpeechReadinessSnapshot(): SpeechReadinessSnapshot {
  return {
    generatedAt: "2026-02-14T00:00:00.000Z",
    requiredLocalModelIds: ["sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20"],
    missingLocalModelIds: ["sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20"],
    download: {
      inProgress: true,
      error: null,
    },
    dictation: {
      enabled: true,
      available: false,
      reasonCode: "stt_unavailable",
      message: "Dictation is unavailable: speech-to-text service is not ready.",
      retryable: false,
      missingModelIds: [],
    },
    realtimeVoice: {
      enabled: true,
      available: false,
      reasonCode: "stt_unavailable",
      message: "Realtime voice is unavailable: speech-to-text service is not ready.",
      retryable: false,
      missingModelIds: [],
    },
    voiceFeature: {
      enabled: true,
      available: false,
      reasonCode: "model_download_in_progress",
      message:
        "Voice features are unavailable while models download in the background (sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20).",
      retryable: true,
      missingModelIds: ["sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20"],
    },
  };
}

function createHelloMessage(clientId: string) {
  return {
    type: "hello" as const,
    clientId,
    clientType: "cli" as const,
    protocolVersion: 1,
  };
}

function createDirectRequest() {
  return {
    headers: {
      host: "localhost:6767",
      origin: "http://localhost:6767",
      "user-agent": "vitest",
    },
    socket: {
      remoteAddress: "127.0.0.1",
    },
    url: "/ws",
  };
}

async function attachRelayAndHello(params: {
  server: VoiceAssistantWebSocketServer;
  socket: MockSocket;
  clientId: string;
}) {
  await params.server.attachExternalSocket(params.socket, { transport: "relay" });
  params.socket.emit("message", JSON.stringify(createHelloMessage(params.clientId)));
  await Promise.resolve();
  expect(params.socket.sent.length).toBeGreaterThan(0);
  const envelope = JSON.parse(params.socket.sent[0] as string) as {
    type?: unknown;
    message?: { type?: unknown; payload?: unknown };
  };
  expect(envelope.type).toBe("session");
  const serverInfo = parseServerInfoStatusPayload(envelope.message?.payload);
  expect(envelope.message?.type).toBe("status");
  expect(serverInfo).not.toBeNull();
  return serverInfo!;
}

async function attachDirectAndHello(params: {
  server: VoiceAssistantWebSocketServer;
  socket: MockSocket;
  clientId: string;
}) {
  await (params.server as any).attachSocket(params.socket, createDirectRequest());
  params.socket.emit("message", JSON.stringify(createHelloMessage(params.clientId)));
  await Promise.resolve();
  expect(params.socket.sent.length).toBeGreaterThan(0);
  const envelope = JSON.parse(params.socket.sent[0] as string) as {
    type?: unknown;
    message?: { type?: unknown; payload?: unknown };
  };
  expect(envelope.type).toBe("session");
  const serverInfo = parseServerInfoStatusPayload(envelope.message?.payload);
  expect(envelope.message?.type).toBe("status");
  expect(serverInfo).not.toBeNull();
  return serverInfo!;
}

describe("relay external socket reconnect behavior", () => {
  beforeEach(() => {
    sessionMock.instances.length = 0;
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  test("keeps the same session when relay reconnects within grace window", async () => {
    const server = createServer();
    const clientId = "cid-relay-reconnect";

    const socket1 = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: socket1,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    socket1.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(1_000);
    expect(session.cleanup).not.toHaveBeenCalled();

    const socket2 = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: socket2,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);

    await vi.advanceTimersByTimeAsync(20_000);
    expect(session.cleanup).not.toHaveBeenCalled();

    await server.close();
  });

  test("closes pending connection when hello timeout elapses", async () => {
    const server = createServer();

    const socket = new MockSocket();
    let closeCode: number | null = null;
    let closeReason = "";
    socket.on("close", (code: unknown, reason: unknown) => {
      closeCode = typeof code === "number" ? code : null;
      closeReason = typeof reason === "string" ? reason : String(reason ?? "");
    });

    await (server as any).attachSocket(socket, createDirectRequest());
    await vi.advanceTimersByTimeAsync(15_000);

    expect(closeCode).toBe(4001);
    expect(closeReason).toBe("Hello timeout");
    expect(sessionMock.instances).toHaveLength(0);

    await server.close();
  });

  test("returns server_info when clientId reconnects with existing session", async () => {
    const server = createServer();
    const clientId = "cid-resume-flag";

    const firstSocket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: firstSocket,
      clientId,
    });

    firstSocket.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(1_000);

    const secondSocket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: secondSocket,
      clientId,
    });

    await server.close();
  });

  test("returns server_info for distinct clientIds", async () => {
    const server = createServer();

    const firstSocket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: firstSocket,
      clientId: "cid-new-1",
    });

    const secondSocket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: secondSocket,
      clientId: "cid-new-2",
    });
    expect(sessionMock.instances).toHaveLength(2);

    await server.close();
  });

  test("rejects session messages before hello", async () => {
    const server = createServer();
    const socket = new MockSocket();
    let closeCode: number | null = null;
    let closeReason = "";
    socket.on("close", (code: unknown, reason: unknown) => {
      closeCode = typeof code === "number" ? code : null;
      closeReason = typeof reason === "string" ? reason : String(reason ?? "");
    });

    await server.attachExternalSocket(socket, { transport: "relay" });
    socket.emit(
      "message",
      JSON.stringify({
        type: "session",
        message: {
          type: "ping",
        },
      }),
    );
    await Promise.resolve();

    expect(closeCode).toBe(4002);
    expect(["Invalid hello", "Session message before hello"]).toContain(closeReason);
    expect(sessionMock.instances).toHaveLength(0);

    await server.close();
  });

  test("reuses direct session when same clientId reconnects within grace window", async () => {
    const server = createServer();
    const clientId = "cid-direct-reconnect";

    const socket1 = new MockSocket();
    await attachDirectAndHello({
      server,
      socket: socket1,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    socket1.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(1_000);
    expect(session.cleanup).not.toHaveBeenCalled();

    const socket2 = new MockSocket();
    await attachDirectAndHello({
      server,
      socket: socket2,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);

    await vi.advanceTimersByTimeAsync(20_000);
    expect(session.cleanup).not.toHaveBeenCalled();

    await server.close();
  });

  test("reuses one session when switching from direct to relay with the same clientId", async () => {
    const server = createServer();
    const clientId = "cid-switch-path";

    const directSocket = new MockSocket();
    await attachDirectAndHello({
      server,
      socket: directSocket,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    const relaySocket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: relaySocket,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);

    const onMessage = session.args.onMessage as
      | ((msg: { type: "status"; payload: { status: string } }) => void)
      | undefined;
    expect(onMessage).toBeTypeOf("function");
    onMessage?.({
      type: "status",
      payload: { status: "ok" },
    });

    expect(directSocket.sent.length).toBeGreaterThan(0);
    expect(relaySocket.sent.length).toBeGreaterThan(0);

    directSocket.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(1_000);
    expect(session.cleanup).not.toHaveBeenCalled();

    relaySocket.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(90_000);
    expect(session.cleanup).toHaveBeenCalledTimes(1);

    await server.close();
  });

  test("cleans up relay session when reconnect grace expires", async () => {
    const server = createServer();
    const clientId = "cid-relay-grace-expire";

    const socket1 = new MockSocket();
    await attachRelayAndHello({
      server,
      socket: socket1,
      clientId,
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    socket1.emit("close", 1006, "");
    await vi.advanceTimersByTimeAsync(90_000);
    expect(session.cleanup).toHaveBeenCalledTimes(1);

    await server.close();
  });

  test("includes voice capabilities in initial server_info when speech readiness exists", async () => {
    const speechReadiness = createReadySpeechReadinessSnapshot();
    const server = createServer({ speechReadiness });

    const socket = new MockSocket();
    const serverInfo = (await attachRelayAndHello({
      server,
      socket,
      clientId: "cid-server-info-capabilities",
    })) as {
      version?: unknown;
      capabilities?: {
        voice?: {
          dictation?: { enabled?: unknown; reason?: unknown };
          voice?: { enabled?: unknown; reason?: unknown };
        };
      };
    };
    expect(serverInfo.version).toBe(TEST_DAEMON_VERSION);
    expect(serverInfo.capabilities?.voice?.dictation?.enabled).toBe(
      speechReadiness.dictation.enabled,
    );
    expect(serverInfo.capabilities?.voice?.dictation?.reason).toBe("");
    expect(serverInfo.capabilities?.voice?.voice?.enabled).toBe(
      speechReadiness.realtimeVoice.enabled,
    );
    expect(serverInfo.capabilities?.voice?.voice?.reason).toBe("");

    await server.close();
  });

  test("broadcasts updated server_info when capabilities change", async () => {
    const server = createServer();

    const socket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket,
      clientId: "cid-server-info-broadcast",
    });
    expect(socket.sent).toHaveLength(1);

    const speechReadiness = createReadySpeechReadinessSnapshot();
    server.publishSpeechReadiness(speechReadiness);
    expect(socket.sent).toHaveLength(2);

    const secondEnvelope = JSON.parse(socket.sent[1] as string) as {
      message?: { payload?: unknown };
    };
    const secondPayload = parseServerInfoStatusPayload(secondEnvelope.message?.payload);
    expect(secondPayload?.capabilities?.voice?.dictation.enabled).toBe(true);
    expect(secondPayload?.capabilities?.voice?.voice.enabled).toBe(true);

    // Same readiness should not produce another server_info broadcast.
    server.publishSpeechReadiness(speechReadiness);
    expect(socket.sent).toHaveLength(2);

    await server.close();
  });

  test("includes temporary retry guidance while models are downloading", async () => {
    const server = createServer();
    const socket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket,
      clientId: "cid-server-info-download-guidance",
    });
    expect(socket.sent).toHaveLength(1);

    server.publishSpeechReadiness(createDownloadInProgressSpeechReadinessSnapshot());
    expect(socket.sent).toHaveLength(2);

    const envelope = JSON.parse(socket.sent[1] as string) as {
      message?: { payload?: unknown };
    };
    const payload = parseServerInfoStatusPayload(envelope.message?.payload);
    expect(payload?.capabilities?.voice?.dictation.enabled).toBe(true);
    expect(payload?.capabilities?.voice?.voice.enabled).toBe(true);
    expect(payload?.capabilities?.voice?.dictation.reason).toContain("Try again in a few minutes.");
    expect(payload?.capabilities?.voice?.voice.reason).toContain("Try again in a few minutes.");

    await server.close();
  });

  test("routes inbound terminal frames to session.handleBinaryFrame", async () => {
    const server = createServer();

    const socket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket,
      clientId: "cid-binary-inbound",
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    socket.emit(
      "message",
      Buffer.from(
        encodeTerminalStreamFrame({
          opcode: TerminalStreamOpcode.Input,
          slot: 9,
          payload: new TextEncoder().encode("ls\r"),
        }),
      ),
    );
    await Promise.resolve();

    expect(session.handleBinaryFrame).toHaveBeenCalledTimes(1);
    const frame = session.handleBinaryFrame.mock.calls[0]?.[0] as {
      opcode: number;
      slot: number;
      payload: Uint8Array;
    };
    expect(frame.opcode).toBe(TerminalStreamOpcode.Input);
    expect(frame.slot).toBe(9);
    expect(new TextDecoder().decode(frame.payload)).toBe("ls\r");

    await server.close();
  });

  test("sends outbound terminal frames from session over websocket", async () => {
    const server = createServer();

    const socket = new MockSocket();
    await attachRelayAndHello({
      server,
      socket,
      clientId: "cid-binary-outbound",
    });
    expect(sessionMock.instances).toHaveLength(1);
    const session = sessionMock.instances[0]!;

    const onBinaryMessage = session.args.onBinaryMessage as
      | ((frame: Uint8Array) => void)
      | undefined;
    expect(onBinaryMessage).toBeTypeOf("function");

    onBinaryMessage?.(new Uint8Array([TerminalStreamOpcode.Output, 12, 0x6f, 0x6b]));

    expect(socket.sent).toHaveLength(2);
    const binaryPayload = asUint8Array(socket.sent[1]);
    expect(binaryPayload).not.toBeNull();
    const frame = decodeTerminalStreamFrame(binaryPayload!);
    expect(frame).not.toBeNull();
    expect(frame!.opcode).toBe(TerminalStreamOpcode.Output);
    expect(frame!.slot).toBe(12);
    expect(new TextDecoder().decode(frame!.payload ?? new Uint8Array())).toBe("ok");

    await server.close();
  });
});