Make changing port and hostname possible with environment variables (#11

)

* Use to Deno.execPath

The current "new URL(import.meta.url).pathname" will not resolve to the current path if we use deno compile.

* Provide adapter option to determine the path

* Introduce environment variables to change the port and hostname

* Add documentation and change default hostname

* Do not use a dependency

* Set correct default host

* Fix default hostname

README.md

@@ -45,10 +45,20 @@ deployment.
 
 Using [deployctl](https://deno.com/deploy/docs/deployctl):
 
-```
+```sh
 deployctl deploy --project=demo --import-map=import_map.json mod.ts
 ```
 
+### Change the port or hostname
+
+The following environment variables can be used to change the port and hostname:
+
+```sh
+PORT=5678 HOST=0.0.0.0 deno run --allow-env --allow-read --allow-net mod.ts
+```
+
+The default port is `8000` and the default hostname is `127.0.0.1`.
+
 ## Adapter options
 
 See the [TypeScript definition](/index.d.ts) for `AdapterOptions`. You can

files/mod.ts

@@ -12,10 +12,14 @@ const baseDir = dirname(CURRENT_DIRNAME);
 const rootDir = join(baseDir, "static");
 
 Deno.serve(
+  {
+    port: Number.parseInt(Deno.env.get("PORT") ?? "8000"),
+    hostname: Deno.env.get("HOST") ?? "0.0.0.0",
+  },
   async (request: Request, info: Deno.ServeHandlerInfo): Promise<Response> => {
     // Get client IP address
-    const clientAddress = request.headers.get("x-forwarded-for") ??
-      info.remoteAddr.hostname;
+    const clientAddress =
+      request.headers.get("x-forwarded-for") ?? info.remoteAddr.hostname;
 
     const { pathname } = new URL(request.url);
 
@@ -38,7 +42,7 @@ Deno.serve(
     if (!slashed && !extname(pathname) && prerendered.has(pathname)) {
       const response = await serveFile(
         request,
-        join(rootDir, `${pathname}.html`),
+        join(rootDir, `${pathname}.html`)
       );
       if (response.ok || response.status === 304) {
         return response;
@@ -57,16 +61,17 @@ Deno.serve(
       ) {
         response.headers.set(
           "cache-control",
-          "public, max-age=31536000, immutable",
+          "public, max-age=31536000, immutable"
         );
       }
       return response;
     }
 
     // Pass to the SvelteKit server
     await initialized;
+
     return server.respond(request, {
       getClientAddress: () => clientAddress,
     });
-  },
+  }
 );