来自serverless.yml中的引用函数 [英] Reference function from within serverless.yml
问题描述
我有几个运行的AWS lambda,由 Serverless Framework 支持.我需要一个lambda(称为lambdaOne
),它将使用AWS的javascript sdk调用第二个lambda(称为lambdaTwo
).问题是,当我尝试执行此操作时,我得到了AccessDenied
异常:
I have several AWS lambdas running, supported by the Serverless Framework. I need one lambda (called lambdaOne
) which will call a second lambda (called lambdaTwo
) using AWS' javascript sdk. The issue is that I am getting an AccessDenied
Exception when I attempt this:
UnhandledPromiseRejectionWarning:未处理的承诺拒绝(拒绝ID:1): AccessDeniedException:用户:arn:aws:sts :: 12345678909876:assumed-role/test-dev-us-west-2-lambdaRole/test-dev-lambdaOne无权执行:lambda:调用资源上的函数:arn:aws :lambda:us-west-2:994979977450:function:test-dev-lambdaTwo
UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): AccessDeniedException: User: arn:aws:sts::12345678909876:assumed-role/test-dev-us-west-2-lambdaRole/test-dev-lambdaOne is not authorized to perform: lambda:Invoke Function on resource: arn:aws:lambda:us-west-2:994979977450:function:test-dev-lambdaTwo
据我了解,无服务器创建了所有lambda函数的默认IAM 角色.因此,我应该只能在iamRoleStatements
下添加一个新条目.
To my understanding, Serverless creates a default IAM role for all lambda functions. So, I should be able to just to add a new entry under iamRoleStatements
.
My confusion arises from the fact that the resource I want to reference (lambdaTwo
) is already defined as a function.
是否可以引用function
作为资源?
Is there a way to reference a function
as a resource?
推荐答案
当前,没有快捷方式来声明Lambda函数的权限.您需要根据其ARN授予权限.
Currently, there is no shortcut to declare permissions for a Lambda function. You need to give permissions based on its ARN.
下面是一个工作示例.
serverless.yml
service: test-invoke-function
provider:
name: aws
runtime: nodejs6.10
region: us-east-1
stage: dev
environment:
AWS_ACCOUNT: 1234567890 # use your own AWS ACCOUNT number here
# define the ARN of the function that you want to invoke
FUNCTION_ARN: "arn:aws:lambda:${self:provider.region}:${self:provider.environment.AWS_ACCOUNT}:function:${self:service}-${self:provider.stage}-lambdaTwo"
functions:
# lambdaOne will invoke lambdaTwo
lambdaOne:
handler: handler.lambdaOne
role: functionPermission # we'll define later in this file
lambdaTwo:
handler: handler.lambdaTwo
# define the IAM permissions of our Lambda function
resources:
Resources:
functionPermission:
Type: AWS::IAM::Role
Properties:
RoleName: functionPermission
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action: sts:AssumeRole
Policies:
- PolicyName: functionPermission
PolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: "Allow"
Action:
- "lambda:InvokeFunction"
Resource: "${self:provider.environment.FUNCTION_ARN}"
handler.js
const AWS = require('aws-sdk');
module.exports.lambdaOne = (event, context, callback) => {
const lambda = new AWS.Lambda();
const params = {
FunctionName: process.env.FUNCTION_ARN,
Payload: JSON.stringify({ message: 'lambdaOne invoking lambdaTwo' })
};
// invoke lambdaTwo
lambda.invoke(params, (err, data) => {
if (err) {
callback(err, null);
return;
}
const response = {
statusCode: 200,
body: JSON.stringify({
message: 'lambdaOne result',
result: data
})
};
callback(null, response);
});
};
module.exports.lambdaTwo = (event, context, callback) => {
const response = {
statusCode: 200,
body: JSON.stringify({
message: 'lambdaTwo result',
data: event
})
};
callback(null, response);
};
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