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feat(FN-4782): complete Step 3 — inject view chunk preload

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Fusion-Task-Id: FN-4782
Fusion-Task-Lineage: 5d6b5632-a135-4d25-9382-57fa23e22484
This commit is contained in:
Fusion (runfusion.ai)
2026-05-17 01:45:12 -07:00
committed by gsxdsm
parent 6bb70dc805
commit aa105c9b80
2 changed files with 175 additions and 2 deletions
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123
packages/dashboard/src/__tests__/server-view-preload.test.ts Normal file
View File

@@ -0,0 +1,123 @@
// @vitest-environment node
import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { afterEach, describe, expect } from "vitest";
import { TaskStore } from "@fusion/core";
import { createServer } from "../server.js";
import { createLoopbackIntegrationTest } from "./loopback-integration-test.js";
const serverViewPreloadIntegrationTest = await createLoopbackIntegrationTest("server-view-preload integration");
let tempRoots: string[] = [];
function makeTempDir(prefix: string): string {
const dir = mkdtempSync(join(tmpdir(), prefix));
tempRoots.push(dir);
return dir;
}
async function startServerWithFixture(clientDir: string) {
const rootDir = makeTempDir("fn-4782-root-");
const globalDir = makeTempDir("fn-4782-global-");
const store = new TaskStore(rootDir, globalDir);
await store.init();
const previousClientDir = process.env.FUSION_CLIENT_DIR;
process.env.FUSION_CLIENT_DIR = clientDir;
const app = createServer(store);
const server = await new Promise<import("node:http").Server>((resolve) => {
const s = app.listen(0, "127.0.0.1", () => resolve(s));
});
return {
server,
restoreEnv: () => {
process.env.FUSION_CLIENT_DIR = previousClientDir;
},
};
}
afterEach(() => {
for (const dir of tempRoots) {
rmSync(dir, { recursive: true, force: true });
}
tempRoots = [];
});
describe("server index preload injection", () => {
serverViewPreloadIntegrationTest("injects view chunk map and modulepreload bootstrap", async () => {
const clientDir = makeTempDir("fn-4782-client-");
mkdirSync(join(clientDir, ".vite"), { recursive: true });
writeFileSync(join(clientDir, "index.html"), "<!doctype html><html><head></head><body><div id=\"root\"></div></body></html>");
writeFileSync(
join(clientDir, ".vite", "manifest.json"),
JSON.stringify({ "components/AgentsView.tsx": { file: "assets/AgentsView-abc123.js" } }),
);
const { server, restoreEnv } = await startServerWithFixture(clientDir);
try {
const address = server.address();
if (!address || typeof address === "string") throw new Error("Missing server address");
const res = await fetch(`http://127.0.0.1:${address.port}/`);
const html = await res.text();
expect(res.status).toBe(200);
expect(html).toContain("window.__FUSION_VIEW_CHUNKS__");
expect(html).toContain('"agents":"/assets/AgentsView-abc123.js"');
expect(html).toContain("modulepreload");
} finally {
restoreEnv();
await new Promise<void>((resolve, reject) => server.close((err) => (err ? reject(err) : resolve())));
}
});
serverViewPreloadIntegrationTest("serves index with empty chunk map when manifest is missing", async () => {
const clientDir = makeTempDir("fn-4782-client-no-manifest-");
writeFileSync(join(clientDir, "index.html"), "<!doctype html><html><head></head><body><div id=\"root\"></div></body></html>");
const { server, restoreEnv } = await startServerWithFixture(clientDir);
try {
const address = server.address();
if (!address || typeof address === "string") throw new Error("Missing server address");
const res = await fetch(`http://127.0.0.1:${address.port}/`);
const html = await res.text();
expect(res.status).toBe(200);
expect(html).toContain("window.__FUSION_VIEW_CHUNKS__={}");
} finally {
restoreEnv();
await new Promise<void>((resolve, reject) => server.close((err) => (err ? reject(err) : resolve())));
}
});
serverViewPreloadIntegrationTest("escapes script poison in inlined chunk map", async () => {
const clientDir = makeTempDir("fn-4782-client-escape-");
mkdirSync(join(clientDir, ".vite"), { recursive: true });
writeFileSync(join(clientDir, "index.html"), "<!doctype html><html><head></head><body><div id=\"root\"></div></body></html>");
writeFileSync(
join(clientDir, ".vite", "manifest.json"),
JSON.stringify({ "components/AgentsView.tsx": { file: "assets/AgentsView-</script>-abc.js" } }),
);
const { server, restoreEnv } = await startServerWithFixture(clientDir);
try {
const address = server.address();
if (!address || typeof address === "string") throw new Error("Missing server address");
const res = await fetch(`http://127.0.0.1:${address.port}/`);
const html = await res.text();
expect(res.status).toBe(200);
expect(html).toContain("<\\/script>");
expect(html).not.toContain('assets/AgentsView-</script>-abc.js");(()=>');
} finally {
restoreEnv();
await new Promise<void>((resolve, reject) => server.close((err) => (err ? reject(err) : resolve())));
}
});
});

54
packages/dashboard/src/server.ts
View File

@@ -72,6 +72,7 @@ import {
tasksBouncedToInProgressPerDay, tasksBouncedToInProgressPerDay,
tasksEnteredInReviewPerDay, tasksEnteredInReviewPerDay,
} from "./reliability-metrics.js"; } from "./reliability-metrics.js";
import { loadViewChunkManifest } from "./view-chunk-manifest.js";
const __dirname = dirname(fileURLToPath(import.meta.url)); const __dirname = dirname(fileURLToPath(import.meta.url));
@@ -656,6 +657,52 @@ export function createServer(store: TaskStore, options?: ServerOptions): ReturnT
? join(__dirname, "..", "dist", "client") ? join(__dirname, "..", "dist", "client")
: join(__dirname, "..", "client"); : join(__dirname, "..", "client");
let cachedIndexClientDir: string | null = null;
let cachedIndexHtml: string | null = null;
let cachedTemplatedIndexHtml: string | null = null;
const buildViewPreloadInjection = (chunkMap: Record<string, string>): string => {
const serializedChunkMap = JSON.stringify(chunkMap).replace(/<\//g, "<\\/");
return `<script>window.__FUSION_VIEW_CHUNKS__=${serializedChunkMap};(()=>{try{const chunkMap=window.__FUSION_VIEW_CHUNKS__||{};const projectId=localStorage.getItem("kb-dashboard-current-project");const scopedKey=projectId?"kb:"+projectId+":kb-dashboard-task-view":null;let taskView=(scopedKey&&localStorage.getItem(scopedKey))||localStorage.getItem("kb-dashboard-task-view");if(taskView==="devserver")taskView="dev-server";if(taskView==="roadmaps")taskView="board";if(typeof taskView!=="string"||taskView.startsWith("plugin:"))return;const chunkPath=chunkMap[taskView];if(!chunkPath)return;const link=document.createElement("link");link.rel="modulepreload";link.href=chunkPath;link.crossOrigin="";document.head.appendChild(link);}catch{}})();</script>`;
};
const renderIndexHtml = (): string => {
const resolvedClientDir = process.env.FUSION_CLIENT_DIR
? process.env.FUSION_CLIENT_DIR
: clientDir;
if (cachedTemplatedIndexHtml && cachedIndexClientDir === resolvedClientDir) {
return cachedTemplatedIndexHtml;
}
const indexPath = join(resolvedClientDir, "index.html");
if (!cachedIndexHtml || cachedIndexClientDir !== resolvedClientDir) {
cachedIndexHtml = readFileSync(indexPath, "utf8");
cachedIndexClientDir = resolvedClientDir;
}
const chunkMap = loadViewChunkManifest(resolvedClientDir);
const injection = buildViewPreloadInjection(chunkMap);
const marker = "<!-- fusion:view-preload -->";
const withInjectedHead = cachedIndexHtml.includes(marker)
? cachedIndexHtml.replace(marker, `${marker}\n${injection}`)
: cachedIndexHtml.replace("</head>", `${injection}</head>`);
cachedTemplatedIndexHtml = withInjectedHead;
return withInjectedHead;
};
const serveIndexHtml = (_req: express.Request, res: express.Response): void => {
try {
const html = renderIndexHtml();
res.setHeader("Content-Type", "text/html; charset=utf-8");
res.setHeader("Cache-Control", "no-store, max-age=0");
res.status(200).send(html);
} catch {
res.status(404).end();
}
};
if (!isHeadless) { if (!isHeadless) {
app.get("/version.json", (_req, res) => { app.get("/version.json", (_req, res) => {
res.setHeader("Cache-Control", "no-store, max-age=0"); res.setHeader("Cache-Control", "no-store, max-age=0");
@@ -665,7 +712,10 @@ export function createServer(store: TaskStore, options?: ServerOptions): ReturnT
} }
}); });
}); });
app.use(express.static(clientDir)); if (existsSync(join(clientDir, "index.html"))) {
app.get(["/", "/index.html"], serveIndexHtml);
app.use(express.static(clientDir, { index: false }));
}
} }
// Create ChatStore for chat session management (available for SSE event forwarding) // Create ChatStore for chat session management (available for SSE event forwarding)
@@ -1400,7 +1450,7 @@ export function createServer(store: TaskStore, options?: ServerOptions): ReturnT
res.status(404).end(); res.status(404).end();
return; return;
} }
res.sendFile(join(clientDir, "index.html")); serveIndexHtml(req, res);
}); });
} }