我是否需要包括admin.initializeApp();在我所有的Firebase云功能文件(Typescript)中?

时间:2018-10-10 14:22:36

标签: typescript firebase google-cloud-functions

问题:如果我想在单独的功能文件中使用Firebase服务,我是否必须在每个文件的顶部包含admin.initializeApp();

目前最佳做法是什么?

我有一个包含3个文件的源文件夹

  1. auth.ts-admin.initializeApp位于此文件的顶部
  2. http.ts-如果要使用Firebase服务,是否在这里添加它?
  3. index.ts

我的index.ts文件是:

export { basicHTTP, advanceHTTP, api } from "./http";
export { createUserRecord } from "./auth";

我的auth.ts文件使用admin.firestore():

import * as functions from "firebase-functions";

import * as admin from "firebase-admin";

admin.initializeApp();

const db = admin.firestore();

export const createUserRecord = functions.auth
  .user()
  .onCreate((user, context) => {
    const userRef = db.doc(`users/${user.uid}`);
    return userRef.set({
      name: user.displayName,
      createdAt: context.timestamp,
      nickname: "bubba"
    });
  });

我的http.ts文件包含以下内容,如果我想在此功能内使用Firebase服务怎么办?:

import * as functions from "firebase-functions";

import * as admin from "firebase-admin";

// Express
import * as express from "express";
import * as cors from "cors";

// Most basic http function

export const basicHTTP = functions.https.onRequest((request, response) => {
  response.send("Hello from firebase");
});

export const advanceHTTP = functions.https.onRequest((request, response) => {
  const name = request.query.name;

  if (!name) {
    response.status(400).send("You must supply a name");
  }

  response.send(`Hi there ${name}`);
});

// Custom middleware

const auth = (request, response, next) => {
  if (!request.header.authorization) {
    response.status(400).send("Unauthorized. Access denied");
  }
  next();
};

// Multi Route ExpressJS HTTP Function

const app = express();

app.use(cors({ origin: true }));

app.use(auth);

app.get("/cat", (request, response) => {
  response.send("Cat");
});

app.get("/dog", (request, response) => {
  response.send("dog");
});

export const api = functions.https.onRequest(app);

1 个答案:

答案 0 :(得分:1)

第一次运行此命令

import * as admin from "firebase-admin";
admin.initializeApp();

从其他文件中的后续导入返回的admin已被初始化。这是因为从模块中进行的所有导入都会产生完全相同的对象。

如果您想在多个地方使用firebase-admin,则可能只需在函数入口点(index.ts)导入并初始化一次,然后在所有其他地方假定它已经被初始化:

import * as admin from "firebase-admin";
admin.initializeApp();
export { basicHTTP, advanceHTTP, api } from "./http";
export { createUserRecord } from "./auth";

现在,您只需在其他模块中导入firebase-admin即可使用admin,而无需对其进行初始化。