feat: support Python functions runtime for init & deploy

src/deploy/functions/runtimes/discovery/index.ts

@@ -72,7 +72,7 @@ export async function detectFromPort(
 
   while (true) {
     try {
-      res = await Promise.race([fetch(`http://localhost:${port}/__/functions.yaml`), timedOut]);
+      res = await Promise.race([fetch(`http://127.0.0.1:${port}/__/functions.yaml`), timedOut]);
       break;
     } catch (err: any) {
       // Allow us to wait until the server is listening.

src/deploy/functions/runtimes/index.ts

@@ -1,5 +1,6 @@
 import * as backend from "../backend";
 import * as build from "../build";
+import * as python from "./python";
 import * as node from "./node";
 import * as validate from "../validate";
 import { FirebaseError } from "../../../error";
@@ -9,7 +10,7 @@ const RUNTIMES: string[] = ["nodejs10", "nodejs12", "nodejs14", "nodejs16", "nod
 // Experimental runtimes are part of the Runtime type, but are in a
 // different list to help guard against some day accidentally iterating over
 // and printing a hidden runtime to the user.
-const EXPERIMENTAL_RUNTIMES = ["go113"];
+const EXPERIMENTAL_RUNTIMES: string[] = ["python310", "python311"];
 export type Runtime = typeof RUNTIMES[number] | typeof EXPERIMENTAL_RUNTIMES[number];
 
 /** Runtimes that can be found in existing backends but not used for new functions. */
@@ -34,7 +35,8 @@ const MESSAGE_FRIENDLY_RUNTIMES: Record<Runtime | DeprecatedRuntime, string> = {
   nodejs14: "Node.js 14",
   nodejs16: "Node.js 16",
   nodejs18: "Node.js 18",
-  go113: "Go 1.13",
+  python310: "Python 3.10",
+  python311: "Python 3.11 (Preview)",
 };
 
 /**
@@ -63,6 +65,11 @@ export interface RuntimeDelegate {
    */
   runtime: Runtime;
 
+  /**
+   * Path to the bin used to run the source code.
+   */
+  bin: string;
+
   /**
    * Validate makes sure the customers' code is actually viable.
    * This includes checks like making sure a package.json file is
@@ -109,9 +116,7 @@ export interface DelegateContext {
 }
 
 type Factory = (context: DelegateContext) => Promise<RuntimeDelegate | undefined>;
-// Note: golang has been removed from delegates because it does not work and it
-// is not worth having an experiment for yet.
-const factories: Factory[] = [node.tryCreateDelegate];
+const factories: Factory[] = [node.tryCreateDelegate, python.tryCreateDelegate];
 
 /**
  *