Firestore事件触发的云函数

Question

我已经部署了云函数（第 2 代），每次在我的 Firestore 数据库中创建“消息”集合中的新文档时，都会触发该函数。应该将带有硬编码字符串的“测试”数据字段添加到此文档中。我可以看到该函数实际上是在创建新文档时触发的，但我不断收到 TypeError:

TypeError: Cannot read properties of undefined (reading 'value')
    at func (/workspace/node_modules/firebase-functions/lib/v2/providers/firestore.js:297:115)
    at /layers/google.nodejs.functions-framework/functions-framework/node_modules/@google-cloud/functions-framework/build/src/function_wrappers.js:113:25
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

无法弄清楚问题所在。

这是正在执行的代码：

const {logger} = require("firebase-functions");
const {onDocumentCreated} = require("firebase-functions/v2/firestore");
const {initializeApp} = require("firebase-admin/app");
const { getFirestore } = require("firebase-admin/firestore");

initializeApp();

const functionsRegion = "europe-west1";

exports.testtrigger = onDocumentCreated({region: functionsRegion}, "/messages/{documentId}", (event) => {
  logger.log("Inside test_trigger function");

  const test = "Function was triggered on new document creation.";
  const documentRef = getFirestore().doc(event.data.value.name); 
  return documentRef.set({ test }, { merge: true }); 
});

我也试图退货：

return event.data.ref.set({test}, {merge: true});

这基本上是一样的事情。都失败了。

顺便说一句，我遵循 firebase docs 和

makeuppercase

函数给了我同样的错误。

来自文档：

// Listens for new messages added to /messages/:documentId/original
// and saves an uppercased version of the message
// to /messages/:documentId/uppercase
exports.makeuppercase = onDocumentCreated("/messages/{documentId}", (event) => {
  // Grab the current value of what was written to Firestore.
  const original = event.data.data().original;

  // Access the parameter `{documentId}` with `event.params`
  logger.log("Uppercasing", event.params.documentId, original);

  const uppercase = original.toUpperCase();

  // You must return a Promise when performing
  // asynchronous tasks inside a function
  // such as writing to Firestore.
  // Setting an 'uppercase' field in Firestore document returns a Promise.
  return event.data.ref.set({uppercase}, {merge: true});
});

如何解决这个问题？

Answer 1

好吧，在彻底阅读错误消息和文档后，我发现了问题 - 这就是我在该地区通过的方式。

错误消息指向库中的代码：/workspace/node_modules/firebase-functions/lib/v2/providers/firestore.js:297:115

这就是给出错误的函数：

function onOperation(eventType, documentOrOpts, handler) {
    const { document, database, namespace, opts } = getOpts(documentOrOpts);
    // wrap the handler
    const func = (raw) => {
        const event = raw;
        const documentPattern = new path_pattern_1.PathPattern(typeof document === "string" ? document : document.value());
        const params = makeParams(event.document, documentPattern);
        const firestoreEvent = makeFirestoreEvent(eventType, event, params);
        return (0, trace_1.wrapTraceContext)((0, onInit_1.withInit)(handler))(firestoreEvent);
    };
    func.run = handler;
    func.__endpoint = makeEndpoint(eventType, opts, document, database, namespace);
    return func;
}
exports.onOperation = onOperation;

特别是这一行：

new path_pattern_1.PathPattern(typeof document === "string" ? document : document.value())

这让我意识到该文件没有被正确通过。

解决方案：

我搜索了文档并找到了如何正确通过该区域：

const functionsRegion = "europe-west1"; //pass your region here

exports.tester = onDocumentCreated(
    {
      document: "messages/{documentId}",
      region: functionsRegion,
    },
    "collection_name/{documentId}",
    (event) => {
     // rest of your code
    });

现在一切正常。案件已结:)