fix: hotpatching fullstack (#4730)

* fix: hotpatching fullstack

* add hot-patching fullstack test

* add caching to playwright apt-get

* only run playwright on beta

* install binutils?

* dont commit lockfile

* ignore lockfiles

* make sure ld is in path

packages/playwright-tests/web-patch-fullstack.spec.js

@@ -0,0 +1,113 @@
+// @ts-check
+const { test, expect } = require("@playwright/test");
+
+const hotPatchTimeout = {
+  timeout: 1000 * 60 * 2, // 2 minute
+};
+
+test("button click", async ({ page }) => {
+  const fs = require("fs");
+  const mainPath = "web-hot-patch-fullstack-temp/src/main.rs";
+  var mainContent = fs.readFileSync(mainPath, "utf8");
+  const stylePath = "web-hot-patch-fullstack-temp/assets/style.css";
+  var styleContent = fs.readFileSync(stylePath, "utf8");
+
+  // Reset any changes made to the main.rs and style.css files.
+  mainContent = mainContent.replace(/Ok\(\s*2\s*\)/g, "Ok(1)");
+  mainContent = mainContent.replace("Click button! Count:", "Click me! Count:");
+  mainContent = mainContent.replace("asset!('/assets/alternative-style.css')", "asset!('/assets/style.css')");
+  fs.writeFileSync(mainPath, mainContent);
+  styleContent = styleContent.replace(
+    "background-color: blue;",
+    "background-color: red;"
+  );
+  fs.writeFileSync(stylePath, styleContent);
+
+  await page.goto("http://localhost:9981");
+
+
+  // wait a sec for the serverfn to process
+  // give the page time to finish loading resources
+  await page.waitForLoadState("networkidle");
+  await page.waitForTimeout(2000);
+
+  // ** First test make sure the initial fat build is working **
+  // Expect the page to contain the counter text.
+  const main = page.locator("#main");
+  await expect(main).toContainText("Click me! Count: 0");
+
+  // Click the increment button.
+  let button = page.locator("button#increment-button");
+  await button.click();
+
+  await page.waitForTimeout(1000);
+
+  // Expect the page to contain the updated counter text.
+  await expect(main).toContainText("Click me! Count: 1");
+
+  // Make sure the css is applied correctly.
+  await expect(main).toHaveCSS("background-color", "rgb(255, 0, 0)");
+
+  // Make sure the image is loaded.
+  const headerImage = page.locator("#toasts");
+  // expect the attribute src to start with /assets/toasts-
+  await expect(headerImage).toHaveAttribute("src", /\/assets\/toasts-/);
+
+  // ** Then make sure the hot patch is working **
+  // Then change the file to increment by 2.
+  const updatedContent = mainContent.replace(/Ok\(\s*1\s*\)/g, "Ok(2)");
+  // Change the click me text to reflect the new increment.
+  const updatedContentWithText = updatedContent.replace(
+    "Click me! Count:",
+    "Click button! Count:"
+  );
+  fs.writeFileSync(mainPath, updatedContentWithText);
+
+  // Wait for the page to update and show the new text.
+  await expect(main).toContainText("Click button! Count: 1", hotPatchTimeout);
+
+  // Now click the button again.
+  await button.click();
+
+  // wait a sec for the serverfn to process
+  await page.waitForTimeout(1000);
+
+  // Expect the count to update by 2.
+  await expect(main).toContainText("Click button! Count: 3");
+
+  // Next change just the css file to change the background color to blue.
+  const updatedStyleContent = styleContent.replace(
+    "background-color: red;",
+    "background-color: blue;"
+  );
+  fs.writeFileSync(stylePath, updatedStyleContent);
+
+  // Wait for the page to update the background color.
+  await expect(main).toHaveCSS(
+    "background-color",
+    "rgb(0, 0, 255)",
+    hotPatchTimeout
+  );
+
+  // Make sure the image is still loaded.
+  // expect the attribute src to start with /assets/toasts-
+  await expect(headerImage).toHaveAttribute("src", /\/assets\/toasts-/);
+
+  // ** Then add a new asset to the page **
+  // Switch from style to alternative-style
+  const updatedContentWithAlternativeStyle = updatedContentWithText.replace(
+    'asset!("/assets/style.css")',
+    'asset!("/assets/alternative-style.css")'
+  );
+  fs.writeFileSync(mainPath, updatedContentWithAlternativeStyle);
+
+  // Assert the page has the new alternative style applied.
+  const body = page.locator("body");
+  // Log the page content to debug if needed.
+  console.log(await page.content());
+  await expect(body).toHaveCSS(
+    "background-color",
+    "rgb(100, 100, 100)",
+    hotPatchTimeout
+  );
+});