Firestore local http with real db：Cloud Firestore 模拟器未运行，因此数据库操作将因“默认凭据”错误而失败

Question

我想在本地运行一个 firebase http 云函数来访问一个真正的远程 Firestore 数据库。

为此，我使用以下方法在本地运行我的函数：

FIREBASE_CONFIG="/path-to-credential.json" GOOGLE_APPLICATION_CREDENTIALS="/path-to-credential.json" firebase emulators:start --only functions

如此处https://firebase.google.com/docs/admin/setup所写，这应该允许在没有任何参数的情况下初始化 admin sdk。我的功能index.js如下

import * as admin from 'firebase-admin';
import * as fromHttpFunc from './http/func'; 

admin.initializeApp(); 

export const httpFunc = fromHttpFunc.httpFunc;

当我然后在浏览器中调用该函数时，这就是我在日志中得到的

[warn] ?  The Cloud Firestore emulator is not running so database operations will fail with a 'default credentials' error.
[debug] [2019-07-20T13:16:28.656Z] [runtime-status] Ephemeral server survived. {}
[info] >  (node:41939) UnhandledPromiseRejectionWarning: Error: The incoming JSON object does not contain a client_email field
[info] >      at JWT.fromJSON (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/google-auth-library/build/src/auth/jwtclient.js:165:19)
[info] >      at GoogleAuth.fromJSON (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/google-auth-library/build/src/auth/googleauth.js:294:16)
[info] >      at GoogleAuth.getClient (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/google-auth-library/build/src/auth/googleauth.js:476:52)
[info] >      at GrpcClient._getCredentials (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/google-gax/build/src/grpc.js:107:40)
[info] >      at GrpcClient.createStub (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/google-gax/build/src/grpc.js:223:34)
[info] >      at new FirestoreClient (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/@google-cloud/firestore/build/src/v1/firestore_client.js:128:39)
[info] >      at ClientPool.Firestore._clientPool.pool_1.ClientPool [as clientFactory] (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/@google-cloud/firestore/build/src/index.js:315:26)
[info] >      at ClientPool.acquire (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/@google-cloud/firestore/build/src/pool.js:61:35)
[info] >      at ClientPool.run (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/@google-cloud/firestore/build/src/pool.js:114:29)
[info] >      at Firestore.readStream (/Users/michele/dev/clubup/backoffice/firebase/functions/node_modules/@google-cloud/firestore/build/src/index.js:995:26)
[info] >  (node:41939) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 3)
[info] >  (node:41939) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
[warn] ?  Your function timed out after ~60s. To configure this timeout, see
      https://firebase.google.com/docs/functions/manage-functions#set_timeout_and_memory_allocation.
[warn] ?  Your function timed out after ~60s. To configure this timeout, see
      https://firebase.google.com/docs/functions/manage-functions#set_timeout_and_memory_allocation.

我不明白出了什么问题，我还检查了凭证的路径是否正确，cat /path-to-credential.json并且我有一个带有该client_email字段的 json 。

Answer 1

通过确保以下几点，设法让本地云功能与真正的远程数据库一起工作：

• 运行firebase login并登录到您要使用的项目

• 按照此评论https://github.com/firebase/firebase-functions/issues/121#issuecomment-337065268确保该文件不存在（我有一个invalid_grant错误）

• export GOOGLE_APPLICATION_CREDENTIALS="SERVICE_ACCOUNT_PATH.json"在您要使用的终端会话中运行（替换 SERVICE_ACCOUNT_PATH）

• 不是通过使用firebase emulators:start --only functions而是使用firebase serve --only functions. 目前，这是一种未记录的行为：https://github.com/firebase/firebase-tools/issues/1412#issuecomment-504561828。

• 按如下方式初始化应用程序（更新 YOUR_APP_ID）：

  admin.initializeApp({ credential: admin.credential.applicationDefault() });