serverless-gradual-traffic-shifting/lib/cfn-template-generators/S3.js

A Serverless plugin to implement gradual deployment of Lambda functions

const _ = require('lodash/fp');

function replaceS3BucketFunctionWithAlias(bucket, functionAlias, functionName) {
  const lambdaConfigurations = _.get('Properties.NotificationConfiguration.LambdaConfigurations', bucket);
  const findTargetFunction = (configuration) => {
    const thisFunctionName = _.get('Function.Fn::GetAtt[0]', configuration);
    return thisFunctionName === functionName;
  };
  const index = _.findIndex(findTargetFunction, lambdaConfigurations);
  return _.set(['Properties', 'NotificationConfiguration', 'LambdaConfigurations', index, 'Function'], { Ref: functionAlias } , bucket);
}

const S3 = {
  replaceS3BucketFunctionWithAlias
};

module.exports = S3;