AWSTemplateFormatVersion: 2010-09-09
Parameters:
  VpcId:
    Description: The VPC id
    Type: String
    Default: ''
  VpcCidr:
    Description: The VPC CIDR block
    Type: String
    Default: ''
  PrivateSubnet1:
    Description: The Private Subnet 1 id
    Type: String
    Default: ''
  PrivateSubnet2:
    Description: The Private Subnet 2 id
    Type: String
    Default: ''
  PrivateSubnet3:
    Description: The Private Subnet 3 id
    Type: String
    Default: ''
  PublicSubnet1:
    Description: The Public Subnet 1 id
    Type: String
    Default: ''
  PublicSubnet2:
    Description: The Public Subnet 2 id
    Type: String
    Default: ''
  PublicSubnet3:
    Description: The Public Subnet 3 id
    Type: String
    Default: ''
  NginxImage:
    Description: Container image
    Type: String
    Default: ''
Resources:
  NginxLogGroup:
    Type: 'AWS::Logs::LogGroup'
    Properties:
      LogGroupName: !Sub '/${NginxCluster}'
  NginxExtNLBTGroup443:
    Type: 'AWS::ElasticLoadBalancingV2::TargetGroup'
    Properties:
      HealthCheckIntervalSeconds: 5
      HealthCheckTimeoutSeconds: 2
      HealthyThresholdCount: 3
      IpAddressType: ipv4
      Port: 443
      Protocol: TCP
      TargetGroupAttributes:
        - Key: proxy_protocol_v2.enabled
          Value: true
      TargetType: ip
      UnhealthyThresholdCount: 3
      VpcId: !Ref VpcId
  NginxExtNLBTGroup80:
    Type: 'AWS::ElasticLoadBalancingV2::TargetGroup'
    Properties:
      HealthCheckIntervalSeconds: 5
      HealthCheckTimeoutSeconds: 2
      HealthyThresholdCount: 3
      IpAddressType: ipv4
      Port: 80
      Protocol: TCP
      TargetGroupAttributes:
        - Key: proxy_protocol_v2.enabled
          Value: true
      TargetType: ip
      UnhealthyThresholdCount: 3
      VpcId: !Ref VpcId
  NginxExtNLB:
    Type: 'AWS::ElasticLoadBalancingV2::LoadBalancer'
    Properties:
      IpAddressType: ipv4
      Scheme: internet-facing
      Subnets:
        - !Ref PublicSubnet1
        - !Ref PublicSubnet2
        - !Ref PublicSubnet3
      Type: network
  NginxExtNLBListener443:
    Type: 'AWS::ElasticLoadBalancingV2::Listener'
    Properties:
      DefaultActions:
        - TargetGroupArn: !Ref NginxExtNLBTGroup443
          Type: forward
      LoadBalancerArn: !Ref NginxExtNLB
      Port: 443
      Protocol: TCP
  NginxExtNLBListener80:
    Type: 'AWS::ElasticLoadBalancingV2::Listener'
    Properties:
      DefaultActions:
        - TargetGroupArn: !Ref NginxExtNLBTGroup80
          Type: forward
      LoadBalancerArn: !Ref NginxExtNLB
      Port: 80
      Protocol: TCP
  NginxIntNLBTGroup443:
    Type: 'AWS::ElasticLoadBalancingV2::TargetGroup'
    Properties:
      HealthCheckIntervalSeconds: 5
      HealthCheckTimeoutSeconds: 2
      HealthyThresholdCount: 3
      IpAddressType: ipv4
      Port: 443
      Protocol: TCP
      TargetGroupAttributes:
        - Key: proxy_protocol_v2.enabled
          Value: true
      TargetType: ip
      UnhealthyThresholdCount: 3
      VpcId: !Ref VpcId
  NginxIntNLBTGroup80:
    Type: 'AWS::ElasticLoadBalancingV2::TargetGroup'
    Properties:
      HealthCheckIntervalSeconds: 5
      HealthCheckTimeoutSeconds: 2
      HealthyThresholdCount: 3
      IpAddressType: ipv4
      Port: 80
      Protocol: TCP
      TargetGroupAttributes:
        - Key: proxy_protocol_v2.enabled
          Value: true
      TargetType: ip
      UnhealthyThresholdCount: 3
      VpcId: !Ref VpcId
  NginxIntNLB:
    Type: 'AWS::ElasticLoadBalancingV2::LoadBalancer'
    Properties:
      IpAddressType: ipv4
      Scheme: internal
      Subnets:
        - !Ref PrivateSubnet1
        - !Ref PrivateSubnet2
        - !Ref PrivateSubnet3
      Type: network
  NginxIntNLBListener443:
    Type: 'AWS::ElasticLoadBalancingV2::Listener'
    Properties:
      DefaultActions:
        - TargetGroupArn: !Ref NginxIntNLBTGroup443
          Type: forward
      LoadBalancerArn: !Ref NginxIntNLB
      Port: 443
      Protocol: TCP
  NginxIntNLBListener80:
    Type: 'AWS::ElasticLoadBalancingV2::Listener'
    Properties:
      DefaultActions:
        - TargetGroupArn: !Ref NginxIntNLBTGroup80
          Type: forward
      LoadBalancerArn: !Ref NginxIntNLB
      Port: 80
      Protocol: TCP
  NginxCluster:
    Type: 'AWS::ECS::Cluster'
    Properties:
      CapacityProviders:
        - FARGATE
      ClusterSettings:
        - Name: containerInsights
          Value: enabled
  NginxTask:
    Type: 'AWS::ECS::TaskDefinition'
    Properties:
      ExecutionRoleArn: !Ref NginxTaskExecRole
      NetworkMode: awsvpc
      ContainerDefinitions:
        - Image: !Ref NginxImage
          Name: Nginx
          PortMappings:
            - ContainerPort: 443
              Protocol: tcp
            - ContainerPort: 80
              Protocol: tcp
          LogConfiguration:
            LogDriver: awslogs
            Options:
              awslogs-region: !Ref 'AWS::Region'
              awslogs-group: !Ref NginxLogGroup
              awslogs-stream-prefix: lattice-ingress
          Ulimits:
            - HardLimit: 1048576
              Name: nofile
              SoftLimit: 1048576
      Cpu: 2048
      Memory: 4096
      RequiresCompatibilities:
        - FARGATE
      RuntimePlatform:
        CpuArchitecture: ARM64
        OperatingSystemFamily: LINUX
      TaskRoleArn: !Ref NginxTaskRole
  NginxService:
    Type: 'AWS::ECS::Service'
    DependsOn:
      - NginxExtNLBListener443
      - NginxIntNLBListener443
      - NginxExtNLBListener80
      - NginxIntNLBListener80
    Properties:
      Cluster: !Ref NginxCluster
      EnableExecuteCommand: true
      LaunchType: FARGATE
      LoadBalancers:
        - ContainerName: Nginx
          ContainerPort: 443
          TargetGroupArn: !Ref NginxExtNLBTGroup443
        - ContainerName: Nginx
          ContainerPort: 443
          TargetGroupArn: !Ref NginxIntNLBTGroup443
        - ContainerName: Nginx
          ContainerPort: 80
          TargetGroupArn: !Ref NginxExtNLBTGroup80
        - ContainerName: Nginx
          ContainerPort: 80
          TargetGroupArn: !Ref NginxIntNLBTGroup80
      NetworkConfiguration:
        AwsvpcConfiguration:
          SecurityGroups:
            - !Ref NginxSecurityGroup
          Subnets:
            - !Ref PrivateSubnet1
            - !Ref PrivateSubnet2
            - !Ref PrivateSubnet3
      SchedulingStrategy: REPLICA
      TaskDefinition: !Ref NginxTask
  NginxSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      VpcId: !Ref VpcId
      GroupDescription: Nginx Security group
      SecurityGroupIngress:
        - CidrIp: !Ref VpcCidr
          IpProtocol: tcp
          FromPort: 443
          ToPort: 443
          Description: Ingress rule for tcp 443
        - CidrIp: !Ref VpcCidr
          IpProtocol: tcp
          FromPort: 80
          ToPort: 80
          Description: Ingress rule for tcp 80
      SecurityGroupEgress:
        - CidrIp: 0.0.0.0/0
          IpProtocol: '-1'
          FromPort: -1
          ToPort: -1
      Tags:
        - Key: Name
          Value: Nginx SG
  NginxTaskExecRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - ecs-tasks.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Policies:
        - PolicyName: ecs-actions
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 'ecr:GetAuthorizationToken'
                  - 'ecr:BatchCheckLayerAvailability'
                  - 'ecr:GetDownloadUrlForLayer'
                  - 'ecr:BatchGetImage'
                  - 'logs:CreateLogStream'
                  - 'logs:PutLogEvents'
                  - 'ssmmessages:CreateControlChannel'
                  - 'ssmmessages:CreateDataChannel'
                  - 'ssmmessages:OpenControlChannel'
                  - 'ssmmessages:OpenDataChannel'
                Resource: '*'
  NginxTaskRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - ecs-tasks.amazonaws.com
            Action:
              - 'sts:AssumeRole'
      Policies:
        - PolicyName: ecs-actions
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 'ssmmessages:CreateControlChannel'
                  - 'ssmmessages:CreateDataChannel'
                  - 'ssmmessages:OpenControlChannel'
                  - 'ssmmessages:OpenDataChannel'
                Resource: '*'
  NginxScalableTarget:
    Type: AWS::ApplicationAutoScaling::ScalableTarget
    Properties: 
      MaxCapacity: 9
      MinCapacity: 3
      ResourceId: !Join ['',['service/',!Ref NginxCluster,'/',!GetAtt NginxService.Name]]
      RoleARN: !Sub 'arn:aws:iam::${AWS::AccountId}:role/aws-service-role/ecs.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_ECSService'
      ScalableDimension: 'ecs:service:DesiredCount'
      ServiceNamespace: 'ecs'
  NginxScalingPolicy:
    Type: AWS::ApplicationAutoScaling::ScalingPolicy
    Properties: 
      PolicyName: !Join ['',['scaling-policy-',!GetAtt NginxService.Name]]
      PolicyType: 'TargetTrackingScaling'
      ResourceId: !Join ['',['service/',!Ref NginxCluster,'/',!GetAtt NginxService.Name]]
      ScalableDimension: 'ecs:service:DesiredCount'
      ScalingTargetId: !Ref NginxScalableTarget
      TargetTrackingScalingPolicyConfiguration:
        TargetValue: 70.0
        ScaleInCooldown: 60
        ScaleOutCooldown: 60
        PredefinedMetricSpecification:
          PredefinedMetricType: ECSServiceAverageCPUUtilization

Outputs:
  VpcId:
    Description: ECS VPC ID
    Value: !Ref VpcId
    Export:
      Name: !Sub ${AWS::StackName}-VpcId
  NginxExtNLB:
    Description: ECS External Load Balancer Name
    Value: !GetAtt NginxExtNLB.DNSName
    Export:
      Name: !Sub ${AWS::StackName}-NginxExtNLB
  NginxIntNLB:
    Description: ECS Internal Load Balancer Name
    Value: !GetAtt NginxIntNLB.DNSName
    Export:
      Name: !Sub ${AWS::StackName}-NginxIntNLB