Aws lambda 如何使用SAM deploy获取lambda，以及自动发布和其他Alise

我在这里的目标是，额外的

SAM deploy

调用将导致：staging别名反映最新版本，并且：live将通过外部方式更新，但必须初始化为部署时创建的相同版本

我正在使用SAM deploy，需要在我的lambdas上使用别名。将它们添加到初始模板中是很棘手的，因为您无法创建具有明确版本号的别名，而AWS CloudFormation会强制保留旧的lambda版本，因此在不检查资源的情况下无法知道版本。这是到目前为止我发现的最好的方法，但是它很麻烦并且不能很好地扩展（每个堆栈都需要相同的逻辑）

此代码还依赖于用于自定义资源管理的

我怎样才能做得更好

template.yaml

GetLatestVersionOfLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
        FunctionName: GetLatestVersionOfLambdaFunction
        Description: Given an existing Lambda Function Name, return the most recent version number
        VersionDescription: !Sub ${deployVersionDescription}
        AutoPublishAlias: staging
        CodeUri: src/
        Handler: getLatestLambdaVersionByName.handler
        MemorySize: 128
        Runtime: nodejs12.x
        Timeout: 10
        Tracing: Active
        Role: !GetAtt GetLatestVersionOfLambdaRole.Arn
SampleLambdaGetMaxVersionFunction:
    Type: Custom::FunctionVersion
    Properties:
        ServiceToken: !GetAtt GetLatestVersionOfLambdaFunction.Arn
        FunctionName: !Ref SampleLambdaFunction
SampleLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
        FunctionName: SampleLambda
        AutoPublishAlias: staging
        CodeUri: src/
        Handler: SampleLambda.handler
        MemorySize: 512
        Runtime: nodejs12.x
        Role: !GetAtt SampleLambdaRole.Arn
SampleLambdaLiveAlias:
    Type: AWS::Lambda::Alias
    Properties:
        FunctionName: !Ref SampleLambdaFunction
        FunctionVersion: !GetAtt SampleLambdaGetMaxVersionFunction.version
        Name: live

src/getLatestLambdaVersionByName.js

const response = require('./cfn-response.js'),
    AWS = require('aws-sdk'),
    lambda = new AWS.Lambda({ apiVersion: '2015-03-31' });

exports.handler = function (event, context) {
    console.log({ GetLatestLambdaVersionBynameEvent: event });

    if (event.RequestType == 'Delete') {
        response.send(event, context, response.SUCCESS);  //, { Delete: true, event } 
        return;
    }

    try {
        let params = {
            FunctionName: event.ResourceProperties.FunctionName,
            MaxItems: 999
        };
        // Use list-versions-by-function then determine the greatest version # and return it
        lambda.listVersionsByFunction(params, function (err, data) {
            console.log({ params, err });
            if (err) {
                console.error(err, err.stack); // an error occurred
                response.send(event, context, response.FAILED);
                return; // JSON.stringify({ error: err });
            } else {
                console.log(JSON.stringify({ Versions: data.Versions }));

                let version = data.Versions[data.Versions.length - 1].Version;
                if (version == '$LATEST') version = 1;
                let res = { version };
                response.send(event, context, response.SUCCESS, res);
                return; // JSON.stringify(res);
            }
        });

    } catch (err) {
        let error = { err, stack: err.stack };
        response.send(event, context, response.FAILED);
        return; // JSON.stringify({ error });
    }
}