feat: make memory-leak-detector connection info configurable

README.md

@@ -4,7 +4,7 @@ Memory Leak Detector is a tiny node server that exposes an HTTP API for making s
 
 It requires a path to the source code so it can scan codebase for `class`.
 
-`pnpm memory-leak-detector ./app`
+`pnpm memory-leak-detector --path ./app`
 
 ## Example app
 
@@ -22,11 +22,47 @@ An example app can be found [here](https://github.com/mainmatter/memory-leak-det
 Install the `memory-leak-detector` dependency
 
 - `pnpm add -D memory-leak-detector`
+- Edit your test runner's option to run Chrome with `--remote-debugging-port=9222` option.
+  Example Configuration for Testem.
+
+```js
+// testem.js
+"use strict";
+
+module.exports = {
+  test_page: "tests/index.html?hidepassed",
+  disable_watching: true,
+  launch_in_ci: ["Chrome"],
+  launch_in_dev: ["Chrome"],
+  browser_start_timeout: 120,
+  browser_args: {
+    Chrome: {
+      ci: [
+        // --no-sandbox is needed when running Chrome inside a container
+        process.env.CI ? "--no-sandbox" : null,
+        "--headless",
+        "--disable-dev-shm-usage",
+        "--disable-software-rasterizer",
+        "--mute-audio",
+        "--remote-debugging-port=9222",
+        "--window-size=1440,900",
+      ].filter(Boolean),
+      dev: [
+        "--disable-dev-shm-usage",
+        "--disable-software-rasterizer",
+        "--mute-audio",
+        "--remote-debugging-port=9222",
+        "--window-size=1440,900",
+      ].filter(Boolean),
+    },
+  },
+};
+```
 
 Define a script that runs a `memory-leak-detector` node server and listen, run your tests as usual, finally wait for the process results.
 
 ```sh
-pnpm memory-leak-detector ./app & pid=$!; pnpm test; wait $pid
+pnpm memory-leak-detector --path ./app & pid=$!; pnpm test; wait $pid
 ```
 
 The reason for waiting for that process' pid is that e.g. Qunit doesn't have a good way to dynamically create and run a test at the end of your test suite while we must have a way to fail the CI in case something's wrong.
@@ -35,7 +71,7 @@ For that reason `detectLeakingClasses` is meant to be used at the end only, beca
 That also means that if you don't intend to use `detectLeakingClasses`, your script should not wait for the `memory-leak-detector` to exit i.e.
 
 ```sh
-pnpm memory-leak-detector ./app & pnpm test
+pnpm memory-leak-detector --path  ./app & pnpm test
 ```
 
 ### Checking for memory leaks after test suite finishes
@@ -88,3 +124,35 @@ test("paginating back and forth", async function (assert) {
 ```
 
 ![Checking for specific class in a test](https://github.com/mainmatter/memory-leak-detector/blob/main/assets/memory_leak_2.png)
+
+## Configuration
+
+### memory-leak-detector
+
+- path: <required>, has no default value.
+- port: <optional>, defaults to 3000.
+
+### Chrome / Test runner
+
+By default a Google Chrome instance is expected to be running on address `127.0.0.1:9222`.
+In case it runs on a different address, you can provide the connection info when calling the HTTP API e.g.
+
+```js
+await detectLeakingClasses("title", document.title, {
+  host: "localhost",
+  port: 9333,
+});
+```
+
+```js
+const assertions = { MyClass: 10 };
+const results = await detectMemoryLeak(
+  "url",
+  document.location.href,
+  assertions,
+  {
+    host: "localhost",
+    port: 9333,
+  },
+);
+```

packages/memory-leak-detector/index.js

@@ -1,5 +1,9 @@
-export async function detectMemoryLeak(by, value, assertions) {
-  // @TODO: Make the server configurable 
+export async function detectMemoryLeak(
+  by,
+  value,
+  assertions,
+  browserAddress = { port: 9222, host: "127.0.0.1" },
+) {
   let response = await fetch(`http://localhost:3000/detect_memory_leak`, {
     method: "POST",
     headers: {
@@ -10,6 +14,7 @@ export async function detectMemoryLeak(by, value, assertions) {
         by,
         value,
       },
+      ...browserAddress,
       assertions,
     }),
   });
@@ -18,7 +23,12 @@ export async function detectMemoryLeak(by, value, assertions) {
   return json.results;
 }
 
-export async function detectLeakingClasses(by, value) {
+export async function detectLeakingClasses(
+  by,
+  value,
+
+  browserAddress = { port: 9222, host: "127.0.0.1" },
+) {
   let response = await fetch(`http://localhost:3000/detect_leaking_classes`, {
     method: "POST",
     headers: {
@@ -29,6 +39,7 @@ export async function detectLeakingClasses(by, value) {
         by,
         value,
       },
+      ...browserAddress,
     }),
   });
   let json = await response.json();

packages/memory-leak-detector/package.json

@@ -18,6 +18,7 @@
     "@babel/parser": "^7.12.10",
     "ast-types": "^0.14.2",
     "chrome-remote-interface": "^0.28.2",
+    "commander": "^12.1.0",
     "ember-cli-babel": "^7.22.1",
     "ember-cli-htmlbars": "^5.3.1",
     "glob": "^11.0.0",

packages/memory-leak-detector/server/index.js

@@ -6,8 +6,22 @@ const inventoryClasses = require("./inventory-classes.js");
 const express = require("express");
 const cors = require("cors");
 
+const { program } = require("commander");
+
 function main() {
-  const [, , sourceDirectory] = process.argv;
+  program
+    .requiredOption(
+      "--path <path>",
+      "A path to the codebase in order to scan any class declaration for automated leak detection.",
+    )
+    .option(
+      "--port <port>",
+      "A port number that `memory-leak-detector` should listen to.",
+      3000,
+    );
+  program.parse();
+
+  const cliOptions = program.opts();
   const app = express();
 
   app.use(cors());
@@ -16,27 +30,23 @@ function main() {
   app.post(
     "/detect_memory_leak",
     handleDetectMemoryLinkRequest({
-      port: 9222,
-      host: "127.0.0.1",
       classes: [],
       writeSnapshot: false,
     }),
   );
   app.post(
     "/detect_leaking_classes",
     checkLeakingClasses({
-      port: 9222,
-      host: "127.0.0.1",
       allowedToLeak: ["App"],
-      classes: inventoryClasses(sourceDirectory),
+      classes: inventoryClasses(cliOptions.path),
       writeSnapshot: false,
     }),
   );
 
-  app.post("/close", (_req, _res) => process.exit(0))
+  app.post("/close", (_req, _res) => process.exit(0));
 
-  app.listen(3000, () => {
-    console.log("Memory Leak Detector listening on port :3000");
+  app.listen(cliOptions.port, () => {
+    console.log(`Memory Leak Detector listening on port :${cliOptions.port}`);
   });
 }
 

packages/test-app/package.json

@@ -23,7 +23,7 @@
     "start": "ember serve",
     "test": "concurrently \"pnpm:lint\" \"pnpm:test:*\" --names \"lint,test:\"",
     "test:ember": "ember test",
-    "start:memory-leak-detector": "memory-leak-detector ./app/",
+    "start:memory-leak-detector": "memory-leak-detector --path ./app/",
     "test:memory-leak": "ember test --filter MEMORY_LEAK",
     "test:users": "ember test --filter Users",
     "test": "ember test --filter !MEMORY_LEAK"