質問編集履歴
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よろしくお願いします。
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Puppeteerでのスクレイピングで、
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MaxListeners（）のデフォルトである10回を超える処理をすると
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以下のエラーが出ます。
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> MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 unhandledRejection listeners added. Use emitter.setMaxListeners() to increase limit
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@@ -149,185 +139,3 @@
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end
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end
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MaxListeners()の上限を増やすか、
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上限をなくすことで警告が消えると考えているので、
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その方法を教えていただきたいです。
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環境は以下の通りです。
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windows10
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node 7.6.0
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------- 追記です。
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```typescript
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// main.ts
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import { fork } from "child_process";
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const R = require("rambd");
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const work = () => new Promise(resolve=>{
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const child = fork("pup.ts", [], {
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cwd : __dirname,
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env : process.env,
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})
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child.on("message", result => {
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return resolve(result)
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})
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})
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const fn = async () => {
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const promised = R.range(0, 12).map(() => work())
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const result = await Promise.all(promised)
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console.log(result, 'DONE')
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}
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fn()
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})
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```
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```typescript
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// pup.ts
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const assert = require('assert');
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const puppeteer = require('puppeteer');
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const work = async () => {
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process.on('unhandledRejection', console.dir);
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const browser = await puppeteer.launch();
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const page = await browser.newPage();
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await page.goto('http://~~', {waitUntil: 'networkidle2'});
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await page.focus('input[name="username"]');
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await page.type('xxxxx');
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await page.focus('input[name="password"]');
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await page.type('yyyyy');
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const buttonElement = await page.$('button[type=submit]');
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await buttonElement.click();
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await page.waitFor(5000);
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const selecterResult = await page.evaluate(() => {
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const node = document.body.querySelector('span');
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return node.tagName;
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});
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await browser.close();
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return 'end';
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}
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work()
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.then(result => {
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process.send(result)
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process.exit()
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})
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```
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結果は以下の通りです。
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> module.js:472
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throw err;
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^
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Error: Cannot find module 'rambda'
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at Function.Module._resolveFilename (module.js:470:15)
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at Function.Module._load (module.js:418:25)
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at Module.require (module.js:498:17)
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at require (internal/module.js:20:19)
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at Object.<anonymous> (path:4:11)
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at Module._compile (module.js:571:32)
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at Object.Module._extensions..js (module.js:580:10)
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at Module.load (module.js:488:32)
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at tryModuleLoad (module.js:447:12)
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at Function.Module._load (module.js:439:3)
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rambdaを利用していないので当然といえば当然ですが、
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使わないと実装できないのでしょうか？
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1
参考リンクを元に実装、結果
test
CHANGED
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File without changes
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test
CHANGED
|
@@ -165,3 +165,169 @@
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165
165
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windows10
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166
166
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167
167
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node 7.6.0
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168
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+
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169
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+
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170
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+
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171
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+
------- 追記です。
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172
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+
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173
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+
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174
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+
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175
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+
```typescript
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176
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+
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177
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// main.ts
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178
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+
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179
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import { fork } from "child_process";
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180
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const R = require("rambd");
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182
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183
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184
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185
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const work = () => new Promise(resolve=>{
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186
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187
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const child = fork("pup.ts", [], {
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188
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cwd : __dirname,
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env : process.env,
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})
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child.on("message", result => {
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return resolve(result)
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})
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})
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const fn = async () => {
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const promised = R.range(0, 12).map(() => work())
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const result = await Promise.all(promised)
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console.log(result, 'DONE')
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}
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fn()
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})
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```
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```typescript
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// pup.ts
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230
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231
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const assert = require('assert');
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232
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const puppeteer = require('puppeteer');
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234
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const work = async () => {
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process.on('unhandledRejection', console.dir);
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240
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241
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const browser = await puppeteer.launch();
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const page = await browser.newPage();
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await page.goto('http://~~', {waitUntil: 'networkidle2'});
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await page.focus('input[name="username"]');
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await page.type('xxxxx');
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await page.focus('input[name="password"]');
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await page.type('yyyyy');
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258
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const buttonElement = await page.$('button[type=submit]');
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await buttonElement.click();
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await page.waitFor(5000);
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const selecterResult = await page.evaluate(() => {
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const node = document.body.querySelector('span');
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return node.tagName;
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});
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await browser.close();
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return 'end';
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}
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work()
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.then(result => {
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process.send(result)
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process.exit()
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})
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```
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299
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結果は以下の通りです。
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300
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301
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> module.js:472
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302
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303
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throw err;
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305
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^
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Error: Cannot find module 'rambda'
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309
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at Function.Module._resolveFilename (module.js:470:15)
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311
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at Function.Module._load (module.js:418:25)
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313
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at Module.require (module.js:498:17)
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314
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315
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at require (internal/module.js:20:19)
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316
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317
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at Object.<anonymous> (path:4:11)
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318
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319
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at Module._compile (module.js:571:32)
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320
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321
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at Object.Module._extensions..js (module.js:580:10)
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322
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323
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at Module.load (module.js:488:32)
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324
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325
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at tryModuleLoad (module.js:447:12)
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326
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327
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at Function.Module._load (module.js:439:3)
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328
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+
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|
329
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+
|
|
330
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+
|
|
331
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+
rambdaを利用していないので当然といえば当然ですが、
|
|
332
|
+
|
|
333
|
+
使わないと実装できないのでしょうか？
|