implement google analytics

Reference: <https://deno.land/x/[email protected]>

.env.example

@@ -0,0 +1 @@
+GOOGLE_ANALYTICS_ID=""

.gitignore

@@ -1 +1,2 @@
 generated
+.env

codegen/codegen.ts

@@ -1,4 +1,4 @@
-import { copySync } from "@std/fs";
+import { copySync, expandGlobSync } from "@std/fs";
 import { generateTubes } from "./tubes.ts";
 import { generateHTML } from "./html.tsx";
 import { generateFeed } from "./feed.ts";
@@ -11,8 +11,11 @@ if (import.meta.main) {
 function copyFiles() {
   Deno.mkdirSync("generated", { recursive: true });
   copySync("deno.json", "generated/deno.json", { overwrite: true });
-  copySync("main.ts", "generated/main.ts", { overwrite: true });
   copySync("static", "generated", { overwrite: true });
+
+  for (const file of expandGlobSync("*.[ts|tsx]")) {
+    copySync(file.path, `generated/${file.name}`, { overwrite: true });
+  }
 }
 
 function generateFiles() {

deno.json

@@ -15,11 +15,12 @@
     "highlight.js": "npm:highlight.js@^11.9.0",
     "markdown-it": "npm:markdown-it@^14.1.0",
     "markdown-it-anchor": "npm:markdown-it-anchor@^9.0.0",
-    "simplex-noise": "npm:simplex-noise@^4.0.1"
+    "simplex-noise": "npm:simplex-noise@^4.0.1",
+    "ga": "https://deno.land/x/[email protected]/mod.ts"
   },
   "tasks": {
     "generate": "deno run --allow-read --allow-write codegen/codegen.ts",
-    "start": "deno run --allow-net --allow-read main.ts generated",
+    "start": "deno run --allow-net --allow-read --allow-env --env main.ts generated",
     "molt": "deno run -A jsr:@molt/cli -w"
   },
   "fmt": {

google-analytics.ts

@@ -0,0 +1,30 @@
+import { createReporter } from "ga";
+
+const GOOGLE_ANALYTICS_ID = Deno.env.get("GOOGLE_ANALYTICS_ID")!;
+
+const ga = createReporter({ id: GOOGLE_ANALYTICS_ID });
+
+export function useGoogleAnalytics(
+  fn: (
+    request: Request,
+    info: Deno.ServeHandlerInfo<Deno.NetAddr>,
+  ) => Response | Promise<Response>,
+) {
+  return async function (
+    request: Request,
+    info: Deno.ServeHandlerInfo<Deno.NetAddr>,
+  ) {
+    let error;
+    let response: Response;
+    const start = performance.now();
+    try {
+      response = await fn(request, info);
+    } catch (e) {
+      error = e;
+    } finally {
+      ga(request, info, response!, start, error);
+    }
+
+    return response!;
+  };
+}

main.ts

@@ -1,3 +1,6 @@
 import { serveDir } from "@std/http/file-server";
+import { useGoogleAnalytics } from "./google-analytics.ts";
 
-Deno.serve((request) => serveDir(request, { fsRoot: Deno.args[0] ?? "." }));
+Deno.serve(useGoogleAnalytics(
+  (request) => serveDir(request, { fsRoot: Deno.args[0] ?? "." }),
+));