InvalidParameterValueException:Lambda无法承担为函数定义的角色

问题描述

我正在使用适用于JavaScript的AWS开发工具包，并且它正在返回尝试创建Lambda函数时出现以下错误:

I'm using the AWS SDK for JavaScript and it is returning the following error when I try to create a Lambda function:

我已经仔细检查了我的角色，这是完全有效的.但是，我仍然无法创建Lambda函数.

I've double-checked my role and it is perfectly valid. However, I'm still unable to create the Lambda function.

我的角色信任关系是:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": {
                "Service": [
                    "lambda.amazonaws.com"
                ]
            },
            "Action": [
                "sts:AssumeRole"
            ]
        }
    ]
}

推荐答案

当角色无效(不是这种情况)或您尝试创建Lambda函数紧随其后时，会发生此错误.角色创建.亚马逊需要几秒钟的时间才能在所有地区复制您的新角色.因此，此处的解决方法是在创建Lambda函数之前先等待几秒钟.

This error happens when the role is invalid (which is not the case) or when you try to create the Lambda function just after the role creation. Amazon needs a few seconds to replicate your new role through all regions. So, the fix here is to wait a few seconds before creating the Lambda function.

var AWS = require('aws-sdk');
var lambda = new AWS.Lambda();

var params = {}; // define your parameters

lambda.createFunction(params, function(err, data) {
    if (err && err.code === 'InvalidParameterValueException') {

        // try again after a few seconds
        setTimeout(function(){
            lambda.createFunction(params, callback);
        }, 10000);
    } else {
        callback(err, data);
    }
});

解决方案-示例2:

通常，等待5秒钟就足够了，但也可能花费更多时间.对于更强大的解决方案，您可以使用诸如此这样的重试模块.

Solution - Example 2:

Usually, waiting 5 seconds is enough, but it can also take a little more. For a more robust solution, you can use a retry module like this one.

var AWS = require('aws-sdk');
var retry = require('retry');
var lambda = new AWS.Lambda();

var params = {}; // define your parameters

var operation = retry.operation({
    retries: 3,           // try 1 time and retry 3 times if needed, total = 4
    minTimeout: 1 * 1000, // the number of milliseconds before starting the first retry
    maxTimeout: 15 * 1000 // the maximum number of milliseconds between two retries
});

operation.attempt(function(currentAttempt) {
    lambda.createFunction(params, function(err, data) {
        if (operation.retry(err) && err.code === 'InvalidParameterValueException')
            return;

        callback(err);
    });
});

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