firebase-functions.ts

#!/usr/bin/env node

// The MIT License (MIT)
//
// Copyright (c) 2022 Firebase
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

import * as http from "http";
import * as express from "express";
import { loadStack } from "../runtime/loader";
import { stackToWire } from "../runtime/manifest";

function printUsageAndExit() {
  console.error(
    `
Usage: firebase-functions [functionsDir]

Arguments:
  - functionsDir: Directory containing source code for Firebase Functions.
`
  );
  process.exit(1);
}

let functionsDir = ".";

const args = process.argv.slice(2);
if (args.length > 1) {
  if (args[0] === "-h" || args[0] === "--help") {
    printUsageAndExit();
  }
  functionsDir = args[0];
}

let server: http.Server = undefined;
const app = express();

function handleQuitquitquit(req: express.Request, res: express.Response) {
  res.send("ok");
  server.close(() => console.log("shutdown requested via /__/quitquitquit"));
}

app.get("/__/quitquitquit", handleQuitquitquit);
app.post("/__/quitquitquit", handleQuitquitquit);

if (process.env.FUNCTIONS_CONTROL_API === "true") {
  app.get("/__/functions.yaml", async (req, res) => {
    try {
      const stack = await loadStack(functionsDir);
      res.setHeader("content-type", "text/yaml");
      res.send(JSON.stringify(stackToWire(stack)));
    } catch (e) {
      res.status(400).send(`Failed to generate manifest from function source: ${e}`);
    }
  });
}

let port = 8080;
if (process.env.PORT) {
  port = Number.parseInt(process.env.PORT);
}

console.log("Serving at port", port);
server = app.listen(port, () => {
  const address = server.address();
  if (process.send && typeof address === "object") {
    process.send(address.port);
  }
});