问题描述
我有一个JS文件，它仅在由于超时等原因导致预期错误时才会自动重复自身。
- 网站无法访问->超时
- 在“ waitSelector”中查找的标记不存在->达到超时时间
由于无法理解的原因，这会创建内存泄漏错误消息。已经检查了此类问题，以尝试找出它是否已以某种方式链接到Node JS，Puppeteer或Forever库，但尚未遇到其他面临此问题的人。这是我找到的最接近的，但是根据答案here，他的脚本似乎没有错误。
JS文件基本上创建了一个具有基本url的服务器，并侦听端口88。当有人输入"http://localhost:88/some_parameters时，似乎代码到达了第一个try-catch，然后返回到console.log（6 ）无限期地通过console.log（2）进行操作，直到try catch要么成功要么失败。
我不了解这种行为，因为我希望脚本会一直执行到try catch为止，然后等待响应，然后再根据返回的成功或错误进行修改。
在两种情况下，我都输入了两个命令并获得了相同的结果：
forever start forever.json
node loadPage.js
我花了很多时间尝试解决此问题，但仍然不了解这种行为。我得到了想要的图像，但仍然很奇怪，并最终污染了日志。
任何帮助都将受到欢迎！
更新
仅当try-catch返回错误时，才会发生这种奇怪的行为。返回成功的响应后，代码将正常执行而无需重复任何操作。
loadPage.js
var http = require('http');
var url = require('url');
const puppeteer = require('puppeteer');
const { exit } = require('process');
let baseUrl = "http://localhost:88";
// let url = "chrome://gpu";
// demo/love_down.PHP?clean=0&line1=1,8,0-125&orderid=ORDIB2B-9000105953_1
console.log(1);
http.createServer(function (req,res) {
console.log(2);
(async () => {
console.log(3);
// headless set to false opens new browser and closes it when process is completed
const browser = await puppeteer.launch({
headless: true,args: ['--no-sandBox'],timeout: 10000,devtools: true
});
console.log(4);
const completeUrl = `${baseUrl}${req.url}`;
console.log(5);
const parsedUrl = url.parse(completeUrl,true);
console.log(6);
const page = await browser.newPage();
console.log(7);
// Variable to help determine and log required time for different operations lower in the code.
let t0 = Date.Now();
// Console logs used in logs to make them easier to read
// new Date().toISOString().replace('T',' ').substr(0,19) converts time in acceptable format
// with space instead of weird characters.
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"------------------------------Process start for new url------------------------------"
);
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"The url being called is: " + `${baseUrl}${parsedUrl.pathname}${parsedUrl.search}`
);
// ------------------------------START - GO TO URL PART------------------------------
// Try-Catch reaching the targeted url
try {
await page.goto(`${baseUrl}${parsedUrl.pathname}${parsedUrl.search}`,{
waitUntil: 'networkidle0',timeout: 10000
}).then(() => {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"Reached the website!"
);
});
} catch (error) {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"the following 'go to url action' error happened: ",error
);
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"------------------------------Error 'go to action' end for new url------------------------------"
);
browser.close();
process.exit();
}
let t2 = Date.Now();
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"The 'go to url action' took " + (t2 - t0) + " milliseconds."
);
// ------------------------------END - GO TO URL PART------------------------------
// ------------------------------START - WAIT FOR SELECTOR PART------------------------------
// try catch to detect the agreed tag's ID selector
// Once that selected is detected then it means that the model if fully loaded
try {
await page.waitForSelector('#uploadsuccess',{
timeout: 30000
}).then(() => {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"Got the selector!"
);
});
} catch (error) {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"the following 'wait for selector action' error happened: ",19) + "] - " +
"------------------------------Error 'wait for selector action' end for new url------------------------------"
);
browser.close();
process.exit();
}
let t3 = Date.Now();
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"The 'waitForSelector' action took " + (t3 - t2) + " milliseconds."
);
// ------------------------------END - WAIT FOR SELECTOR PART------------------------------
// ------------------------------START - IMAGE SAVING PART------------------------------
// Take a printscreen and saving the image in the corresponding folder
try {
await page.screenshot({
path: "./images/" + new Date().toISOString().replace('T',19) + "-apm-3d.png"
}).then(() => {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"Image saved"
);
});
} catch (error) {
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"the following 'image saving' error happened: ",19) + "] - " +
"------------------------------Error 'image saving' end for new url------------------------------"
);
browser.close();
process.exit();
}
// ------------------------------END - IMAGE SAVING PART------------------------------
let t1 = Date.Now();
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"The whole process took " + (t1 - t0) + " milliseconds."
);
console.log("[" + new Date().toISOString().replace('T',19) + "] - " +
"------------------------------Process end for new url------------------------------"
);
browser.close();
})()
}).listen(88)
forever.log
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[2020-09-09 10:52:14] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:14] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:14] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:14] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:15] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:15] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:16] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:16] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:17] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:17] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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(node:12919) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 exit listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(node:12919) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGINT listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(node:12919) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGTERM listeners added to [process]. Use emitter.setMaxListeners() to increase limit
(node:12919) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 SIGHUP listeners added to [process]. Use emitter.setMaxListeners() to increase limit
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[2020-09-09 10:52:17] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:17] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:18] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:18] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:19] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:19] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:20] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:20] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:21] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:21] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:22] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:22] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:23] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:23] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:24] - ------------------------------Process start for new url------------------------------
[2020-09-09 10:52:24] - The url being called is: http://localhost:88/demo/love_down.PHP?clean=0&line1=1,0-125&orderid=ORDIB2B-9000105953_1
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[2020-09-09 10:52:24] - the following 'go to url action' error happened: TimeoutError: Navigation timeout of 10000 ms exceeded
at /Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/node_modules/puppeteer/lib/cjs/puppeteer/common/LifecycleWatcher.js:106:111
at async FrameManager.navigateFrame (/Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/node_modules/puppeteer/lib/cjs/puppeteer/common/FrameManager.js:88:21)
at async Frame.goto (/Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/node_modules/puppeteer/lib/cjs/puppeteer/common/FrameManager.js:405:16)
at async Page.goto (/Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/node_modules/puppeteer/lib/cjs/puppeteer/common/Page.js:826:16)
at async /Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/loadPage.js:49:13
[2020-09-09 10:52:24] - ------------------------------Error 'go to action' end for new url------------------------------
error: Forever detected script exited with code: 0
error: Script restart attempt #1
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error: restarting script because /Users/sebastienponcelet/Documents/3d-puppeteer/3d-puppeteer/stack-overflow.md changed
error: Forever detected script was killed by signal: SIGKILL
error: Script restart attempt #2
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解决方法
问题是您一次又一次地调用同一HTTP服务器，而没有返回响应。
HTTP服务器正在侦听端口88：
http.createServer(function (req,res) {
...
}).listen(88)
然后您发出第一个HTTP请求，以便该过程开始。 2-7点之后，过程到达以下行：
await page.goto(`${baseUrl}${parsedUrl.pathname}${parsedUrl.search}`,{
这指示操纵p到页面http://localhost:88/demo/love_down.php?clean=0&line1=1,8,0-125&orderid=ORDIB2B-9000105953_1（也位于localhost：88上），再次击中同一HTTP服务器。
第二个请求到达时，它会执行相同的过程，启动浏览器，提取URL，然后向http://localhost:88/...发出请求，从而生成另一个浏览器，并发出另一个请求，依此类推。这就是为什么您会一遍又一遍地看到2-7的原因，这是一个无限递归的教科书示例。
由于所有浏览器都在等待响应，但是这种响应永远不会发生，因此它们最终会超时，这就是为什么您看到错误的原因。
,您的catch块中包含process.exit()，这将关闭服务器。永远无法看到该进程被杀死并重新启动它。只需删除该行即可。
我已经成功地解决了这个问题，只需在执行操作时删除try-catch即可。真的不知道为什么，但是这使程序无限期地循环直到返回响应。
那里的代码现在看起来像这样：
// ------------------------------START - GO TO URL PART------------------------------
await page.goto(`${baseUrl}${parsedUrl.pathname}${parsedUrl.search}`,{
waitUntil: 'networkidle2',timeout: 10000
})
let t2 = Date.now();
console.log("[" + new Date().toISOString().replace('T',' ').substr(0,19) + "] - " +
"The 'go to url action' took " + (t2 - t0) + " milliseconds."
);
// ------------------------------END - GO TO URL PART------------------------------
很高兴有任何评论来解释为什么这样做可以解决问题。