---
AWSTemplateFormatVersion: 2010-09-09
Description: ElastiCache Redis Cluster

Parameters:

  # ElastiCache stack creation prerequisite:  First create a VPC stack - see README for more info
  NetworkStackName:
    Description: Active CloudFormation stack containing VPC resources
    Type: String
    MinLength: 1
    MaxLength: 255
    AllowedPattern: "^[a-zA-Z][-a-zA-Z0-9]*$"
    Default: fargate-game-servers-ecs-resources

  ClusterName:
    Description: Custom name of the cluster. Auto generated if you don't supply your own.
    Type: String
    AllowedPattern: "^[a-zA-Z][-a-zA-Z0-9]*$"
    Default: GameCluster

  CacheNodeType:
    Description: Cache node instance class, e.g. cache.t2.micro(free tier). See https://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/CacheNodes.SelectSize.html
    Type: String
    Default: cache.t2.micro
    ConstraintDescription: Node instance class not supported
    AllowedValues:
      - cache.t2.micro
      - cache.t2.small
      - cache.t2.medium
      - cache.m4.large
      - cache.m4.xlarge
      - cache.m4.2xlarge
      - cache.m4.4xlarge
      - cache.m4.10xlarge
      - cache.r4.large
      - cache.r4.xlarge
      - cache.r4.2xlarge
      - cache.r4.4xlarge
      - cache.r4.8xlarge
      - cache.r4.16xlarge

  AutoMinorVersionUpgrade:
    Description: Whether or not minor version upgrades to the cache engine should be applied automatically during the maintenance window.
    Type: String
    Default: true
    AllowedValues:
      - true
      - false

Resources:

  SubnetGroup:
    Type: AWS::ElastiCache::SubnetGroup
    Properties:
      Description: Cache Subnet Group
      SubnetIds:
        - Fn::ImportValue: !Sub ${NetworkStackName}:PrivateSubnetOne
        - Fn::ImportValue: !Sub ${NetworkStackName}:PrivateSubnetTwo

  ElastiCacheCluster:
    Type: AWS::ElastiCache::CacheCluster
    Properties:
      AutoMinorVersionUpgrade: !Ref AutoMinorVersionUpgrade
      Engine: redis
      CacheNodeType: !Ref CacheNodeType
      ClusterName : !Ref ClusterName
      NumCacheNodes: 1
      CacheSubnetGroupName: !Ref SubnetGroup
      VpcSecurityGroupIds:
        - Fn::ImportValue: !Sub ${NetworkStackName}:InternalSecurityGroup
      Tags:
        - Key: Name
          Value: !Ref AWS::StackName

Outputs:

  ElastiCacheStackName:
    Description: ElastiCache Stack Name
    Value: !Ref AWS::StackName
    Export:
      Name: !Sub ${AWS::StackName}:ElastiCacheName

  ElastiCacheClusterArn:
    Description: ElastiCache Cluster Arn
    Value: !Sub arn:aws:elasticache:${AWS::Region}:${AWS::AccountId}:cluster/${ElastiCacheCluster}
    Export:
      Name: !Sub ${AWS::StackName}:ElastiCacheClusterArn

  ElastiCacheClusterId:
    Description: ElastiCache Cluster ID
    Value: !Ref ElastiCacheCluster
    Export:
      Name: !Sub ${AWS::StackName}:ElastiCacheClusterID

  ElastiCacheAddress:
    Description: ElastiCache endpoint address
    Value: !GetAtt ElastiCacheCluster.RedisEndpoint.Address
    Export:
      Name: !Sub ${AWS::StackName}:ElastiCacheAddress

  ElastiCachePort:
    Description: ElastiCache port
    Value: 6379
    Export:
      Name: !Sub ${AWS::StackName}:ElastiCachePort