Question

在尝试编写要在Firebase上部署的函数时，我编写了以下代码：

'use strict';
const elasticsearch = require('elasticsearch');
const firebaseAdmin = require('firebase-admin');
const functions = require('firebase-functions');
const Promise  = require('promise');

const config = {
    firebaseUrl: FIREBASE_URL,
    elasticSearchUrl: ELASTICSEARCH_URL
};
// configure firebase
const serviceAccount = require("./serviceAccountKey.json");
firebaseAdmin.initializeApp({
  credential: firebaseAdmin.credential.cert(serviceAccount),
  databaseURL: config.firebaseUrl
});
const database = firebaseAdmin.database();
const client =  new elasticsearch.Client({
    host: config.elasticSearchUrl
});
exports.indexentry = functions.database.ref('/posts/{postid}/text').onWrite(event => {
  let data = event.data.val();
  let post_id = event.params.postid;

  let indexData = {
        index: "firebase",
        type: "posts",
        id: post_id,
        body: data
    }

  return client.index(indexData).then(response => {
    console.log('Response: ');
  });
});

我收到错误：

错误：解析函数触发器时出错。

RangeError: Maximum call stack size exceeded
    at Function.EventEmitter.listenerCount (events.js:440:38)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)
    at Function.EventEmitter.listenerCount (events.js:442:20)
    at Log.listenerCount (C:\Users\Dell\AppData\Local\Temp\fbfn_10872H41uMk66c53o\node_modules\elasticsearch\src\lib\log.js:68:25)

在Github的一条评论中，我发现了一个修复：它让我在我的代码中的任何地方添加它：

var EventEmitter = require('events').EventEmitter;
var Log = require('./node_modules/elasticsearch/src/lib/log');
Log.prototype.listenerCount = EventEmitter.prototype.listenerCount;

现在我收到一个错误：

Error: unknown error at respond (/user_code/node_modules/elasticsearch/src/lib/transport.js:234:15) at checkRespForFailure (/user_code/node_modules/elasticsearch/src/lib/transport.js:200:7) at HttpConnector.<anonymous> (/user_code/node_modules/elasticsearch/src/lib/connectors/http.js:155:7) at IncomingMessage.wrapper (/user_code/node_modules/elasticsearch/node_modules/lodash/index.js:3095:19) at emitNone (events.js:91:20) at IncomingMessage.emit (events.js:185:7) at endReadableNT (_stream_readable.js:974:12) at _combinedTickCallback (internal/process/next_tick.js:74:11) at process._tickDomainCallback (internal/process/next_tick.js:122:9)
 Error: unknown error
    at respond (/user_code/node_modules/elasticsearch/src/lib/transport.js:234:15)
    at checkRespForFailure (/user_code/node_modules/elasticsearch/src/lib/transport.js:200:7)
    at HttpConnector.<anonymous> (/user_code/node_modules/elasticsearch/src/lib/connectors/http.js:155:7)
    at IncomingMessage.wrapper (/user_code/node_modules/elasticsearch/node_modules/lodash/index.js:3095:19)
    at emitNone (events.js:91:20)
    at IncomingMessage.emit (events.js:185:7)
    at endReadableNT (_stream_readable.js:974:12)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)
    at process._tickDomainCallback (internal/process/next_tick.js:122:9)

如何解决这个问题？

修改

我按照第一个答案的建议更新了elasticsearch。现在我收到了错误：

 Error: [mapper_parsing_exception] failed to parse
        at respond (/user_code/node_modules/elasticsearch/src/lib/transport.js:307:15)
        at checkRespForFailure (/user_code/node_modules/elasticsearch/src/lib/transport.js:266:7)
        at HttpConnector.<anonymous> (/user_code/node_modules/elasticsearch/src/lib/connectors/http.js:159:7)
        at IncomingMessage.bound (/user_code/node_modules/elasticsearch/node_modules/lodash/dist/lodash.js:729:21)
        at emitNone (events.js:91:20)
        at IncomingMessage.emit (events.js:185:7)
        at endReadableNT (_stream_readable.js:974:12)
        at _combinedTickCallback (internal/process/next_tick.js:74:11)
        at process._tickDomainCallback (internal/process/next_tick.js:122:9)

Answer 1

确保您使用的是最新版本的弹性搜索：npm install elasticsearch。在package.json文件中添加正确的依赖项，它应该是弹性搜索的最新版本，或者使用commad，npm install elasticsearch@13.2.0或任何其他版本。
您不需要实际覆盖Log.prototype.listenerCount，elasticsearch已在内部为您执行此操作（因此，调用堆栈递归）。所以，删除这一行：

Log.prototype.listenerCount = EventEmitter.prototype

此外，虽然这与您的问题无关......但在您的需求路径中包含./node_modules是多余的。 Node已经内置了一个模块搜索机制，并为你做了这个。

RangeError：node_modules中超出的最大调用堆栈大小 - ＆gt; elasticsearch

1 个答案: