[英]AWS Lambda Node.js execute this.emit after async HTTP request completes
I am making an API request and would like to ask the user a question with the data returned from the request. 我正在提出一个API请求,并想问用户一个从请求返回的数据的问题。 I make a call to a function, which executes the request and returns the appropriate response:
我调用一个函数,该函数执行请求并返回适当的响应:
httpRequest(params).then(function(body) {
console.log(body);
this.emit(':ask', speechOutput, repromptSpeech);
});
The this.emit function returns an unhandled promise rejection error. this.emit函数返回未处理的promise拒绝错误。 How can I wait for the request callback to be executed and then issue the :ask event?
如何等待请求回调执行,然后发出:ask事件?
The this
inside the promise handler isn't the same as this
outside of it, so I think the unhandled promise rejection might have stated that this.emit
isn't a function. 在
this
承诺内处理程序是不一样的this
之外呢,所以我觉得未处理的承诺,拒绝可能会说, this.emit
不是一个函数。
A quick solution would be to use an arrow function , which is probably why the code in your own answer works too: 一个快速的解决方案是使用箭头函数 ,这可能就是为什么您自己的答案中的代码也能起作用的原因:
// `this` here...
httpRequest(params).then(body => {
console.log(body);
this.emit(':ask', speechOutput, repromptSpeech); // ...is the same as `this` here
}).catch(error => {
console.error('uh-oh!', error);
});
I ended up solving this using the request library: 我最终使用请求库解决了这个问题:
function getEntries() {
return request.get('https://wezift.com/parent-portal/api/entries.json');
}
getEntries().then(
(response) => {
console.log(response);
this.emit(':ask', 'hi', 'hi again');
},
(error) => {
console.error('uh-oh! ' + error);
}
);
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