我是 NodeJS 新手,在 AWS Lambda 内部,我尝试发出一个 POST 请求,该请求使用 JSON 对象调用外部 API,使用响应创建一个文档,然后读取该文件的内容。
来自 Ruby 背景,我认为问题源于我对异步编程的不熟悉,但我尝试使用回调和 readfileSync 进行调试,但没有成功。
任何帮助,将不胜感激。
var querystring = require('querystring');
var https = require('https');
var fs = require('fs');
exports.handler = function(event, context) {
console.log('Received event:', JSON.stringify(event, null, 2));
var operation = event.operation;
delete event.operation;
var accessKey = event.accessKey;
delete event.accessKey;
var templateName = event.templateName;
delete event.templateName;
var outputName = event.outputName;
delete event.outputName;
var req = {
"accessKey": accessKey,
"templateName": templateName,
"outputName": outputName,
"data": event.data
};
function doPost(data, callback) {
// Build the post string from an object
var post_data = JSON.stringify(data);
// An object of options to indicate where to post to
var post_options = {
host: 'hostname.com',
port: '443',
path: '/path/to/api',
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Content-Length': post_data.length
}
};
// Set up the request
var file = fs.createWriteStream(outputName);
var post_req = https.request(post_options, function(res) {
res.setEncoding('utf8');
res.pipe(file);
res.on('response', function(response) {
console.log(response);
});
res.on('error', function(e) {
context.fail('error:' + e.message);
})
res.on('end', function() {
context.succeed('success, end request listener');
});
});
// post the data
post_req.write(post_data);
post_req.end();
callback();
}
function printFileContents() {
fs.readFileSync(outputName, 'utf8', function (err, data) {
console.log('file contents:' + data);
});
}
switch (operation) {
case 'create':
// Make sure there's data before we post it
if(req) {
doPost(req, printFileContents);
printFileContents();
}
break;
...
}
};