opencode-v2

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162// A scripted stand-in for an OpenCode 2 server behind `api.net.fetch`, and
// the runtime the agent tests run on: the event stream the test feeds,
// default answers for the session calls, and every call recorded.
import { afterEach } from "node:test";
import * as Effect from "effect/Effect";
import * as Exit from "effect/Exit";
import * as ManagedRuntime from "effect/ManagedRuntime";
import * as Scope from "effect/Scope";
import { liveLayer } from "convergence/effect";
import type { PluginServices } from "convergence/effect";
import type { AgentEvent } from "convergence/protocol";
import type { RequestInit } from "convergence";
import { FakeStream, fakeApi, fakeResponse } from "../sdk/testing.ts";
import type { HostScript } from "../sdk/testing.ts";
import { OpenCodeV2Agent } from "./agent.ts";

export const BASE = "http://127.0.0.1:4096";

export interface FakeCall {
  method: string;
  path: string;
  query: Record<string, string>;
  body: unknown;
}

export type Routes = (call: FakeCall) => { status?: number; body?: unknown } | undefined;

/// The catalog a fresh server answers with.
export const CATALOG = {
  providers: [{ id: "opencode", name: "OpenCode Zen" }],
  models: [
    {
      id: "fledge-free",
      providerID: "opencode",
      name: "Fledge Free",
      enabled: true,
      limit: { context: 200_000 },
      variants: [{ id: "high" }, { id: "low" }],
    },
    { id: "ling-free", providerID: "opencode", name: "Ling Free", enabled: true },
  ],
  agents: [
    { id: "build", name: "Build", mode: "primary", hidden: false },
    { id: "explore", name: "Explore", mode: "subagent", hidden: false },
    { id: "title", name: "Title", mode: "primary", hidden: true },
  ],
};

export class FakeServer {
  routes: Routes;
  calls: FakeCall[] = [];
  streams: FakeStream[] = [];
  created = 0;

  constructor(routes: Routes = () => undefined) {
    this.routes = routes;
  }

  handle(url: string, init: RequestInit = {}) {
    const parsed = new URL(url);
    const call: FakeCall = {
      method: String(init.method ?? "GET").toUpperCase(),
      path: parsed.pathname,
      query: Object.fromEntries(parsed.searchParams.entries()),
      body: init.body ? JSON.parse(String(init.body)) : null,
    };
    if (call.path === "/api/event") {
      const stream = new FakeStream();
      this.streams.push(stream);
      stream.push(sse({ type: "server.connected", data: {} }));
      return fakeResponse({ status: 200, body: stream, headers: { "content-type": "text/event-stream" } });
    }
    this.calls.push(call);
    const answer = this.routes(call);
    if (answer) return fakeResponse(answer);
    return fakeResponse(this.answer(call));
  }

  answer(call: FakeCall): { status?: number; body?: unknown } {
    const { method, path } = call;
    if (path === "/api/info") return { body: { version: "2.0.16" } };
    if (path === "/api/provider") return { body: { data: CATALOG.providers } };
    if (path === "/api/model") return { body: { data: CATALOG.models } };
    if (path === "/api/model/default") return { body: { data: { id: "fledge-free", providerID: "opencode" } } };
    if (path === "/api/agent") return { body: { data: CATALOG.agents } };
    if (path === "/api/command") return { body: { data: [{ name: "review", description: "review changes" }] } };
    if (path === "/api/session/active") return { body: { data: {} } };
    if (path === "/api/permission/request" || path === "/api/form") return { body: { data: [] } };
    if (path === "/api/mcp") return { body: { data: [{ name: "convergence", status: { status: "connected" } }] } };
    if (method === "POST" && path === "/api/session") {
      this.created += 1;
      return { body: { data: session(`ses_new${this.created}`) } };
    }
    if (method === "GET" && /^\/api\/session\/[^/]+$/.test(path)) {
      return { body: { data: session(path.split("/")[3] ?? "") } };
    }
    if (method === "POST" && path.endsWith("/prompt")) {
      const body = call.body as { id?: string; delivery?: string; text: string };
      return { body: { data: { id: body.id ?? "msg_1", sessionID: path.split("/")[3], type: "user", time: { created: 1 }, payload: { text: body.text }, delivery: body.delivery ?? "steer" } } };
    }
    return { status: 204, body: "" };
  }

  /// Pushes events on the open stream.
  push(...events: { type: string; data: unknown; location?: { directory: string } }[]) {
    const stream = this.streams.at(-1);
    if (!stream) throw new Error("no event stream is open");
    for (const event of events) stream.push(sse(event));
  }

  find(method: string, path: string): FakeCall | undefined {
    return this.calls.find((call) => call.method === method && call.path === path);
  }
}

export function session(id: string, extra: Record<string, unknown> = {}) {
  return { id, time: { created: 1, updated: 2 }, ...extra };
}

export function sse(value: unknown): string {
  return `data: ${JSON.stringify(value)}\n\n`;
}

const cleanups = new Set<() => Promise<void>>();
afterEach(async () => {
  for (const close of cleanups) await close();
  cleanups.clear();
});

/// The agent on a fake server the user runs (so nothing is started), its
/// events in `emitted`, and `run` for its Effect methods.
export function harness({ routes, onHost }: { routes?: Routes; onHost?: HostScript } = {}) {
  const server = new FakeServer(routes);
  const api = fakeApi({ onFetch: (url, init) => server.handle(url, init), ...(onHost ? { onHost } : {}) });
  const runtime: ManagedRuntime.ManagedRuntime<PluginServices, never> = ManagedRuntime.make(
    liveLayer(
      api,
      (effect) => runtime.runPromise(effect as Effect.Effect<never, unknown, PluginServices>),
      () => {},
    ),
  );
  const scope = Scope.makeUnsafe();
  const agent = new OpenCodeV2Agent(scope, { binaryPath: null, serverUrl: BASE });
  const emitted: AgentEvent[] = [];
  agent.emit = (event) => emitted.push(event);
  const run = <A, E>(effect: Effect.Effect<A, E, PluginServices>): Promise<A> => runtime.runPromise(effect);
  cleanups.add(async () => {
    await runtime.runPromise(agent.shutdown());
    await runtime.runPromise(Scope.close(scope, Exit.void));
    await runtime.dispose();
  });
  return { agent, api, server, emitted, run };
}

/// Waits until `test` holds, polling.
export async function until(test: () => unknown, timeout = 3000): Promise<void> {
  const deadline = Date.now() + timeout;
  while (!test()) {
    if (Date.now() > deadline) throw new Error("the condition never held");
    await new Promise((resolve) => setTimeout(resolve, 5));
  }
}