如何解决使用Puppeteer AWS Lambda遍历多个有效负载并拍摄多个屏幕截图 修改后的代码示例播放负载 S3中的示例输出
我当前正在使用以下Puppeteer AWS Lambda Layer抓取30个URL,并在S3中创建和保存屏幕截图。目前,我发送了30个单独的有效负载,因此运行了30个AWS Lambda函数。 https://github.com/shelfio/chrome-aws-lambda-layer
每个JSON有效负载包含一个URL和一个图像文件名,这些URL和图像文件名每2-3秒通过POST请求发送到API Gateway。列表中的前6或9个Lambda函数似乎运行良好,然后由于AWS Cloudwatch中的报告Navigation failed because browser has disconnected!
而失败。
因此,我正在寻找替代解决方案,如何通过处理单个JSON负载数组来编辑下面的代码以批量截取一组30个URL的屏幕快照? (例如,For循环等)
这是我当前用于生成单个AWS Lambda屏幕截图并将其发送到S3的代码:
// src/capture.js
// this module will be provided by the layer
const chromeLambda = require("chrome-aws-lambda");
// aws-sdk is always preinstalled in AWS Lambda in all Node.js runtimes
const S3Client = require("aws-sdk/clients/s3");
process.setMaxListeners(0) // <== Important line - Fix MaxListerners Error
// create an S3 client
const s3 = new S3Client({ region: process.env.S3_REGION });
// default browser viewport size
const defaultViewport = {
width: 1920,height: 1080
};
// here starts our function!
exports.handler = async event => {
// launch a headless browser
const browser = await chromeLambda.puppeteer.launch({
args: chromeLambda.args,executablePath: await chromeLambda.executablePath,defaultViewport
});
console.log("Event URL string is ",event.url)
const url = event.url;
const domain = (new URL(url)).hostname.replace('www.','');
// open a new tab
const page = await browser.newPage();
// navigate to the page
await page.goto(event.url);
// take a screenshot
const buffer = await page.screenshot()
// upload the image using the current timestamp as filename
const result = await s3
.upload({
Bucket: process.env.S3_BUCKET,Key: domain + `.png`,Body: buffer,ContentType: "image/png",ACL: "public-read"
})
.promise();
// return the uploaded image url
return { url: result.Location };
};
当前个人JSON有效负载
{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/gavurin.com.png","url":"https://gavurin.com"}
解决方法
我试图复制该问题并将代码修改为使用循环。
在处理此问题时,我发现了一些值得指出的地方:
- lambda需要大量RAM (在我的测试中至少为1GB,但更好)。使用少量的RAM会导致故障。
- lambda超时必须很大,才能处理许多要截屏的URL。
- 您从JSON有效负载中获取的
img
完全没有使用。我没有修改此行为,因为我不知道这是否是设计使然。
在运行异步for循环和/或不关闭打开的页面时,发现与您类似的错误。
- 修改后的返回值以输出 s3数组的网址。
- 未定义网址
修改后的代码
这是使用nodejs12.x
运行时在我的测试中工作的修改后的代码:
// src/capture.js
var URL = require('url').URL;
// this module will be provided by the layer
const chromeLambda = require("chrome-aws-lambda");
// aws-sdk is always preinstalled in AWS Lambda in all Node.js runtimes
const S3Client = require("aws-sdk/clients/s3");
process.setMaxListeners(0) // <== Important line - Fix MaxListerners Error
// create an S3 client
const s3 = new S3Client({ region: process.env.S3_REGION });
// default browser viewport size
const defaultViewport = {
width: 1920,height: 1080
};
// here starts our function!
exports.handler = async event => {
// launch a headless browser
const browser = await chromeLambda.puppeteer.launch({
args: chromeLambda.args,executablePath: await chromeLambda.executablePath,defaultViewport
});
const s3_urls = [];
for (const e of event) {
console.log(e);
console.log("Event URL string is ",e.url)
const url = e.url;
const domain = (new URL(url)).hostname.replace('www.','');
// open a new tab
const page = await browser.newPage();
// navigate to the page
await page.goto(e.url);
// take a screenshot
const buffer = await page.screenshot()
// upload the image using the current timestamp as filename
const result = await s3
.upload({
Bucket: process.env.S3_BUCKET,Key: domain + `.png`,Body: buffer,ContentType: "image/png",ACL: "public-read"
})
.promise();
await page.close();
s3_urls.push({ url: result.Location });
}
await browser.close();
// return the uploaded image url
return s3_urls;
};
示例播放负载
[
{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/gavurin.com.png","url":"https://gavurin.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/google.com.png","url":"https://google.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/amazon.com","url":"https://www.amazon.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/stackoverflow.com","url":"https://stackoverflow.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/duckduckgo.com","url":"https://duckduckgo.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/docs.aws.amazon.com","url":"https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-features.html"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/github.com","url":"https://github.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/github.com/shelfio/chrome-aws-lambda-layer","url":"https://github.com/shelfio/chrome-aws-lambda-layer"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/gwww.youtube.com","url":"https://www.youtube.com"},{"img":"https://s3screenshotbucket-useast1v5.s3.amazonaws.com/w3docs.com","url":"https://www.w3docs.com"}
]
S3中的示例输出
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