Javascript AWS Lambda函数：无法读取属性'；日志''；页数''；溪流'；未定义的。包装问题还是AWS Lambda问题？

我在AWS Lambda上使用带有Nodejs的幻影html到pdf包将html转换为pdf函数。我遇到了一些错误，这表明

无法读取未定义的属性“日志”

我试着对它进行注释，它显示了另一个错误，即

无法读取未定义的属性“numberOfPages”

我不确定这是软件包的错误还是因为它在AWS Lambda上不起作用。也不确定为什么async中的所有函数都不工作

代码如下：

const fs = require("fs");
var phantomjs = require("phantomjs");
const conversion = require("phantom-html-to-pdf")({});

exports.handler = (event, context, callback) => {
  console.log("Start");
  conversion(
    { html: "<h1>Hello World</h1>" },
    // eslint-disable-next-line handle-callback-err
    async (err, pdf) => {
      const output = fs.createWriteStream("output.pdf");
      console.log("Process");
      console.log(pdf.logs);
      console.log(pdf.numberOfPages);
      // since pdf.stream is a node.js stream you can use it
      // to save the pdf to a file (like in this example) or to
      // respond an http request.
      pdf.stream.pipe(output);
      console.log("Done");
      callback(null, "done");
    }
  );
  console.log("End");
};

更新

我试着改变任何我想要的名字，效果很好。如果我删除

pdf

，它就是不起作用。与上一个错误相同的问题。这里到底发生了什么

const fs = require("fs");
var AWS = require("aws-sdk");
var phantomjs = require("phantomjs");
const conversion = require("phantom-html-to-pdf")({});

exports.handler = (event, context, callback) => {
console.log("Start");
conversion(
  { html: "<h1>Hello World</h1>" },
  // eslint-disable-next-line handle-callback-err
  function(err, haha) {
    const output = fs.createWriteStream("output.pdf");
    console.log("Process");
    //console.log(test.logs);
    //console.log(test.numberOfPages);
    // since pdf.stream is a node.js stream you can use it
    // to save the pdf to a file (like in this example) or to
    // respond an http request.
    haha.stream.pipe(output);
    console.log("Done");
    callback(null, "done");
  }
);
console.log("End");
};

const fs=require（“fs”）；
var AWS=要求（“AWS sdk”）；
var phantomjs=require（“phantomjs”）；
const conversion=require（“幻影html到pdf”）（{}）；
exports.handler=（事件、上下文、回调）=>{
控制台日志（“启动”）；
转化(
{html:“你好，世界”}，
//eslint禁用下一行句柄回调错误
功能（呃，哈哈）{
const output=fs.createWriteStream（“output.pdf”）；
控制台日志（“进程”）；
//console.log（test.log）；
//控制台日志（test.numberOfPages）；
//因为pdf.stream是一个node.js流，所以您可以使用它
//将pdf保存到文件（如本例所示）或
//响应http请求。
哈哈。流。管（输出）；
控制台日志（“完成”）；
回调（空，“完成”）；
}
);
控制台日志（“结束”）；
};

我认为这不是lambda的问题。看起来

pdf

为空-我认为您应该在使用

pdf

之前检查

err

。另外，我认为函数不应该是

async

。是的，我注意到pdf似乎是空的。我稍后会尝试在这里更新。

{
  "errorType": "Runtime.UnhandledPromiseRejection",
  "errorMessage": "TypeError: Cannot read property 'numberOfPages' of undefined",
  "trace": [
    "Runtime.UnhandledPromiseRejection: TypeError: Cannot read property 'numberOfPages' of undefined",
    "    at process.on (/var/runtime/index.js:37:15)",
    "    at process.emit (events.js:198:13)",
    "    at emitPromiseRejectionWarnings (internal/process/promises.js:140:18)",
    "    at process._tickCallback (internal/process/next_tick.js:69:34)"
  ]
}

{
  "errorType": "Runtime.UnhandledPromiseRejection",
  "errorMessage": "TypeError: Cannot read property 'stream' of undefined",
  "trace": [
    "Runtime.UnhandledPromiseRejection: TypeError: Cannot read property 'stream' of undefined",
    "    at process.on (/var/runtime/index.js:37:15)",
    "    at process.emit (events.js:198:13)",
    "    at emitPromiseRejectionWarnings (internal/process/promises.js:140:18)",
    "    at process._tickCallback (internal/process/next_tick.js:69:34)"
  ]
}

const fs = require("fs");
var AWS = require("aws-sdk");
var phantomjs = require("phantomjs");
const conversion = require("phantom-html-to-pdf")({});

exports.handler = (event, context, callback) => {
console.log("Start");
conversion(
  { html: "<h1>Hello World</h1>" },
  // eslint-disable-next-line handle-callback-err
  function(err, haha) {
    const output = fs.createWriteStream("output.pdf");
    console.log("Process");
    //console.log(test.logs);
    //console.log(test.numberOfPages);
    // since pdf.stream is a node.js stream you can use it
    // to save the pdf to a file (like in this example) or to
    // respond an http request.
    haha.stream.pipe(output);
    console.log("Done");
    callback(null, "done");
  }
);
console.log("End");
};