Nodejs API调用返回未定义的lambda函数

问题描述：

这是将调用api的aws lambda函数:

This is the aws lambda function which will invoke an api:

'use strict';

var request = require("request")

exports.handler = function (event, context,callback) {



let url = "https://3sawt0jvzf.execute-api.us-east-1.amazonaws.com/prod/test"

request({
    url: url,
    method: "POST",
    json: event,

}, function (error, response, body) {
    if (!error && response.statusCode === 200) {
        callback(null, { "isBase64Encoded": true|false,
                          "statusCode": "200",
                          "headers": { "headerName": "headerValue"},
                          "body": body});
    }
    else {

        console.log("error: " + error)
        console.log("response.statusCode: " + response.statusCode)
        console.log("response.statusText: " + response.statusText)
    }
})
};

这是写为aws lambda函数的api:

This is the api written as an aws lambda function:

'use strict';


exports.handler = function(event, context, callback) {
console.log(event.name);
callback(null, { "isBase64Encoded": true|false,
                 "statusCode": "200",
                 "headers": { "headerName": "headerValue"},
                 "body": `Hello World ${event.name}`});  // SUCCESS with message
};

当我尝试从lambda函数调用api时，它仅返回"Hello World undefined".它没有在名称末尾附加名称并返回正确的响应.

When I try to call the api from the lambda function it just returns "Hello World undefined". It is not appending the name at the end and returning the correct response.

答

假设:

您正在使用Lambda-Proxy集成.
您想将与第一个Lambda完全相同的有效负载传递给第二个Lambda.*

您误解了event是什么.这不是您通过HTTP请求发送的JSON有效负载.

You're misunderstanding what event is. This is NOT the JSON payload that you sent through your HTTP request.

通过API网关的HTTP请求被转换为类似于以下内容的event对象:

An HTTP request through the API Gateway gets transformed into an event object similar to this:

{
    "resource": "Resource path",
    "path": "Path parameter",
    "httpMethod": "Incoming request's method name"
    "headers": {Incoming request headers}
    "queryStringParameters": {query string parameters }
    "pathParameters":  {path parameters}
    "stageVariables": {Applicable stage variables}
    "requestContext": {Request context, including authorizer-returned key-value pairs}
    "body": "A JSON string of the request payload."
    "isBase64Encoded": "A boolean flag to indicate if the applicable request payload is Base64-encode"
}

如您所见，可以在event.body中以字符串形式访问JSON有效负载.

As you can see, the JSON payload is accessible in a stringified form in event.body.

如果要将相同的有效载荷发送给第二个Lambda，则必须先对其进行解析.

If you want to send the pass the same payload to the second Lambda, you have to parse it first.

const body = JSON.parse(event.body)

然后，发送body而不是event.

然后，在第二个Lambda中，解析event.body中的字符串化JSON，然后取回原始有效负载.

Then, in your second Lambda, you parse the stringified JSON in event.body and then you get your original payload back.

如果您在原始有效载荷中发送了name，则可以从JSON.parse(event.body).name获取它.

If you sent name in that original payload, you can get it from JSON.parse(event.body).name.

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Nodejs API调用返回未定义的lambda函数

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