AWSTemplateFormatVersion: '2010-09-09'
Description: Deploy a service into an ECS cluster behind a public load balancer.
Parameters:
  GerritServiceName:
      Type: String
      Default: gerrit-replica
  GitDaemonServiceName:
      Type: String
      Default: gerrit-git-daemon
  GitSSHServiceName:
      Type: String
      Default: gerrit-git-ssh
  ClusterStackName:
      Description: Stack name of the ECS cluster to deply the serivces
      Type: String
      Default: gerrit-cluster
  TemplateBucketName:
    Description: S3 bucket containing cloudformation templates
    Type: String
  EnvironmentName:
      Description: An environment name used to build the log stream names
      Type: String
      Default: test
  GerritDockerImage:
      Description: Gerrit official Docker image
      Type: String
      Default: aws-gerrit/gerrit:latest
  GitDaemonDockerImage:
      Description: Git daemon Docker image
      Type: String
      Default: aws-gerrit/git-daemon:latest
  GitSSHDockerImage:
      Description: Git SSH Docker image
      Type: String
      Default: aws-gerrit/git-ssh:latest
  DockerRegistryUrl:
      Description: Docker registry URL
      Type: String
  HTTPHostPort:
      Description: Gerrit Host HTTP port
      Type: Number
      Default: 9080
  HTTPContainePort:
      Description: Gerrit Container HTTP port
      Type: Number
      Default: 8080
  HTTPSPort:
      Description: Gerrit HTTPS port
      Type: Number
      Default: 443
  SSHHostPort:
      Description: Gerrit SSH port
      Type: Number
      Default: 39418
  SSHContainerPort:
      Description: Gerrit SSH port
      Type: Number
      Default: 29418
  GitPort:
      Description: Git daemon port
      Type: Number
      Default: 9418
  GitSSHPort:
      Description: Git ssh port
      Type: Number
      Default: 1022
  GitSSHContainerPort:
      Description: Git ssh port
      Type: Number
      Default: 22
  CertificateArn:
      Description: SSL Certificates ARN
      Type: String
  HostedZoneName:
      Description: The route53 HostedZoneName.
      Type: String
  Subdomain:
      Description: The subdomain of the Gerrit cluster
      Type: String
      Default: gerrit-replica-demo
  LoadBalancerScheme:
      Description: Load Balancer schema, The nodes of an Internet-facing load balancer have public IP addresses.
      Type: String
      Default: internet-facing
      AllowedValues: [internal, internet-facing]
  GerritGitVolume:
      Description: Gerrit git volume name
      Type: String
      Default: gerrit-git-replica
  GerritDataVolume:
      Description: Gerrit data volume name
      Type: String
      Default: gerrit-data-replica
  GerritCacheVolume:
      Description: Gerrit cache volume name
      Type: String
      Default: gerrit-cache-replica
  GerritDbVolume:
      Description: Gerrit db volume name
      Type: String
      Default: gerrit-db-replica
  GerritLogsVolume:
      Description: Gerrit logs volume name
      Type: String
      Default: gerrit-logs-replica
  GerritKeyPrefix:
      Description: Gerrit credentials keys prefix
      Type: String
  GerritRAM:
      Description: RAM to allocate to the Gerrit container
      Type: Number
      Default: 6000
  GerritCPU:
      Description: vCPU to allocate to the Gerrit container
      Type: Number
      Default: 1024
  GerritHeapLimit:
      Description: Gerrit Heap limit
      Type: String
      Default: 6g
  FileDescriptorsSoftLimit:
    Description: The soft limit for file descriptors allowed in the Gerrit container
    Type: Number
    Default: 1024
  FileDescriptorsHardLimit:
    Description: The hard limit for file descriptors allowed in the Gerrit container
    Type: Number
    Default: 1024
  JgitCacheSize:
      Description: JGit cache size
      Type: String
      Default: 3g
  JgitOpenFiles:
      Description: Maximum number of pack files to have open at once
      Type: Number
      Default: 128
  LDAPServer:
      Description: LDAP server URL
      Type: String
  LDAPUsername:
      Description: Username to bind to the LDAP server with
      Type: String
  LDAPAccountBase:
      Description: Root of the tree containing all user accounts
      Type: String
  LDAPGroupBase:
      Description: Root of the tree containing all group objects
      Type: String
  LDAPAccountPattern:
      Description: Query pattern to use when searching for a user account
      Type: String
      Default: (&(objectClass=person)(uid=${username}))
  InstanceId:
    Description: Optional identifier for the Gerrit instance
    Type: String
    Default: gerrit-primary-replica-REPLICA
  MetricsCloudwatchEnabled:
    Description: Whether gerrit metrics should be published to cloudwatch
    Type: String
    Default: false
    AllowedValues: [true, false]
  MetricsCloudwatchNamespace:
    Description: The CloudWatch namespace for Gerrit metrics
    Type: String
    Default: gerrit
  MetricsCloudwatchRate:
    Description: The rate at which metrics should be fired to AWS
    Type: String
    Default: 60s
  MetricsCloudwatchInitialDelay:
    Description: The time to delay the first reporting execution
    Type: String
    Default: 0
  MetricsCloudwatchJVMEnabled:
    Description: Whether JVM metrics shoiuld be published to cloudwatch
    Type: String
    Default: false
    AllowedValues: [true, false]
  MetricsCloudwatchDryRun:
    Description: The reporter will log.DEBUG the metrics, instead of doing a real POST to CloudWatch
    Type: String
    Default: false
    AllowedValues: [true, false]
  MetricsCloudwatchExcludeMetrics:
    Description: Comma separated list of regex patterns to exclude metrics reported to CloudWatch
    Type: CommaDelimitedList
    Default: ''
  ReplicaAutoScalingMinCapacity:
    Type: Number
    Description: The minimum number of tasks that replicas should scale in to
    Default: 1
  ReplicaAutoScalingDesiredCapacity:
    Description: The desired number of replica tasks to run
    Type: Number
    Default: 1
  ReplicaAutoScalingMaxCapacity:
    Type: Number
    Description: The maximum number of tasks that replicas should scale out to
    Default: 2
  ReplicaAutoScalingScaleInCooldown:
    Type: Number
    Description: The amount of time, in seconds, after a scale-in activity completes before another scale-in activity can start
    Default: 300
  ReplicaAutoScalingScaleOutCooldown:
    Type: Number
    Description: The amount of time, in seconds, to wait for a previous scale-out activity to take effect.
    Default: 300
  ReplicaAutoScalingTargetCPUPercentage:
    Type: Number
    Description: Aggregate CPU utilization target for auto-scaling
    Default: 75.0

Resources:
    GerritService:
        Type: AWS::ECS::Service
        DependsOn:
          - HTTPListener
          - SSHListener
          - GitListener
          - GitSSHListener
        Properties:
            Cluster:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'ClusterName']]
            CapacityProviderStrategy:
              - CapacityProvider: !Sub '${ClusterStackName}-ReplicaCapacityProvider'
                Weight: 100
            DesiredCount: !Ref ReplicaAutoScalingDesiredCapacity
            TaskDefinition: !Ref GerritTaskDefinition
            LoadBalancers:
                - ContainerName: !Ref GerritServiceName
                  ContainerPort: !Ref HTTPContainePort
                  TargetGroupArn: !Ref HTTPTargetGroup
                - ContainerName: !Ref GerritServiceName
                  ContainerPort: !Ref SSHContainerPort
                  TargetGroupArn: !Ref SSHTargetGroup
                - ContainerName: !Ref GitDaemonServiceName
                  ContainerPort: !Ref GitPort
                  TargetGroupArn: !Ref GitTargetGroup
                - ContainerName: !Ref GitSSHServiceName
                  ContainerPort: !Ref GitSSHContainerPort
                  TargetGroupArn: !Ref GitSSHTargetGroup

    GerritTaskDefinition:
        Type: AWS::ECS::TaskDefinition
        Properties:
            Family: !Join ['', [!Ref GerritServiceName, TaskDefinition]]
            TaskRoleArn: !GetAtt ECSTaskExecutionRoleStack.Outputs.TaskExecutionRoleRef
            ExecutionRoleArn: !GetAtt ECSTaskExecutionRoleStack.Outputs.TaskExecutionRoleRef
            NetworkMode: bridge
            PlacementConstraints:
              - Expression: !Sub 'attribute:target_group == replica'
                Type: "memberOf"
            ContainerDefinitions:
                - Name: !Ref GerritServiceName
                  Essential: true
                  Image: !Sub '${DockerRegistryUrl}/${GerritDockerImage}'
                  Environment:
                    - Name: CANONICAL_WEB_URL
                      Value: !Sub 'https://${Subdomain}.${HostedZoneName}'
                    - Name: HTTPD_LISTEN_URL
                      Value: !Sub 'proxy-https://*:${HTTPContainePort}/'
                    - Name: CONTAINER_REPLICA
                      Value: true
                    - Name: GERRIT_KEY_PREFIX
                      Value: !Ref GerritKeyPrefix
                    - Name: AWS_REGION
                      Value: !Ref AWS::Region
                    - Name: GERRIT_HEAP_LIMIT
                      Value: !Ref GerritHeapLimit
                    - Name: JGIT_CACHE_SIZE
                      Value: !Ref JgitCacheSize
                    - Name: JGIT_OPEN_FILES
                      Value: !Ref JgitOpenFiles
                    - Name: LDAP_SERVER
                      Value: !Ref LDAPServer
                    - Name: LDAP_USERNAME
                      Value: !Ref LDAPUsername
                    - Name: LDAP_ACCOUNT_BASE
                      Value: !Ref LDAPAccountBase
                    - Name: LDAP_GROUP_BASE
                      Value: !Ref LDAPGroupBase
                    - Name: LDAP_ACCOUNT_PATTERN
                      Value: !Ref LDAPAccountPattern
                    - Name: GERRIT_INSTANCE_ID
                      Value: !Ref InstanceId
                    - Name: METRICS_CLOUDWATCH_ENABLED
                      Value: !Ref MetricsCloudwatchEnabled
                    - Name: METRICS_CLOUDWATCH_NAMESPACE
                      Value: !Ref MetricsCloudwatchNamespace
                    - Name: METRICS_CLOUDWATCH_RATE
                      Value: !Ref MetricsCloudwatchRate
                    - Name: METRICS_CLOUDWATCH_INITIAL_DELAY
                      Value: !Ref MetricsCloudwatchInitialDelay
                    - Name: METRICS_CLOUDWATCH_JVM_ENABLED
                      Value: !Ref MetricsCloudwatchJVMEnabled
                    - Name: METRICS_CLOUDWATCH_DRY_RUN
                      Value: !Ref MetricsCloudwatchDryRun
                    - Name: METRICS_CLOUDWATCH_EXCLUDE_METRICS_LIST
                      Value: !Join [',', !Ref MetricsCloudwatchExcludeMetrics]
                  Ulimits:
                    - Name: nofile
                      HardLimit: !Ref FileDescriptorsHardLimit
                      SoftLimit: !Ref FileDescriptorsSoftLimit
                  MountPoints:
                    - SourceVolume: !Ref GerritGitVolume
                      ContainerPath: /var/gerrit/git
                    - SourceVolume: !Ref GerritDataVolume
                      ContainerPath: /var/gerrit/data
                    - SourceVolume: !Ref GerritCacheVolume
                      ContainerPath: /var/gerrit/cache
                    - SourceVolume: !Ref GerritDbVolume
                      ContainerPath: /var/gerrit/db
                    - SourceVolume: !Ref GerritLogsVolume
                      ContainerPath: /var/gerrit/logs
                  Cpu: !Ref GerritCPU
                  Memory: !Ref GerritRAM
                  PortMappings:
                    - ContainerPort: !Ref HTTPContainePort
                      HostPort: !Ref HTTPHostPort
                      Protocol: tcp
                    - ContainerPort: !Ref SSHContainerPort
                      HostPort: !Ref SSHHostPort
                      Protocol: tcp
                  LogConfiguration:
                    LogDriver: awslogs
                    Options:
                        awslogs-group: !Ref ClusterStackName
                        awslogs-region: !Ref AWS::Region
                        awslogs-stream-prefix: !Ref EnvironmentName
                - Name: !Ref GitDaemonServiceName
                  Essential: true
                  Image: !Sub '${DockerRegistryUrl}/${GitDaemonDockerImage}'
                  MountPoints:
                    - SourceVolume: !Ref GerritGitVolume
                      ContainerPath: /var/gerrit/git
                  Cpu: 256
                  Memory: 512
                  PortMappings:
                    - ContainerPort: !Ref GitPort
                      HostPort: !Ref GitPort
                      Protocol: tcp
                  LogConfiguration:
                    LogDriver: awslogs
                    Options:
                        awslogs-group: !Ref ClusterStackName
                        awslogs-region: !Ref AWS::Region
                        awslogs-stream-prefix: !Ref EnvironmentName
                - Name: !Ref GitSSHServiceName
                  Essential: true
                  Image: !Sub '${DockerRegistryUrl}/${GitSSHDockerImage}'
                  Environment:
                    - Name: TZ
                      Value: US/Pacific
                    - Name: SSH_USERS
                      Value: gerrit:1000:1000
                    - Name: AWS_REGION
                      Value: !Ref AWS::Region
                    - Name: GERRIT_KEY_PREFIX
                      Value: !Ref GerritKeyPrefix
                  MountPoints:
                    - SourceVolume: !Ref GerritGitVolume
                      ContainerPath: /var/gerrit/git
                  Cpu: 256
                  Memory: 512
                  PortMappings:
                    - ContainerPort: !Ref GitSSHContainerPort
                      HostPort: !Ref GitSSHPort
                      Protocol: tcp
                  LogConfiguration:
                    LogDriver: awslogs
                    Options:
                        awslogs-group: !Ref ClusterStackName
                        awslogs-region: !Ref AWS::Region
                        awslogs-stream-prefix: !Ref EnvironmentName
            Volumes:
              - Name: !Ref 'GerritDbVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-db: !Join ['-', [!Ref EnvironmentName, !Ref GerritDbVolume]]
              - Name: !Ref 'GerritGitVolume'
                EFSVolumeConfiguration:
                  FilesystemId:
                    Fn::ImportValue:
                      !Join [':', [!Ref 'ClusterStackName', 'ReplicaFileSystemID']]
              - Name: !Ref 'GerritDataVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-data: !Join ['-', [!Ref EnvironmentName, !Ref GerritDataVolume]]
              - Name: !Ref 'GerritCacheVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-cache: !Join ['-', [!Ref EnvironmentName, !Ref GerritCacheVolume]]
              - Name: !Ref 'GerritLogsVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-logs: !Join ['-', [!Ref EnvironmentName, !Ref GerritLogsVolume]]

    ReplicaCPUAutoScaling:
      Type: AWS::CloudFormation::Stack
      Properties:
        TemplateURL: !Join [ '', ['https://', !Ref TemplateBucketName, '.s3.amazonaws.com/cf-ecs-service-cpu-autoscaling.yml'] ]
        TimeoutInMinutes: '5'
        Parameters:
          AutoScalingMinCapacity: !Ref ReplicaAutoScalingMinCapacity
          AutoScalingDesiredCapacity: !Ref ReplicaAutoScalingDesiredCapacity
          AutoScalingMaxCapacity: !Ref ReplicaAutoScalingMaxCapacity
          AutoScalingScaleInCooldown: !Ref ReplicaAutoScalingScaleInCooldown
          AutoScalingScaleOutCooldown: !Ref ReplicaAutoScalingScaleOutCooldown
          AutoScalingTargetCPUPercentage: !Ref ReplicaAutoScalingTargetCPUPercentage
          ResourceId:
            !Join
            - ''
            - - 'service/'
              - Fn::ImportValue: !Join [':', [!Ref 'ClusterStackName', 'ClusterName']]
              - '/'
              - !GetAtt GerritService.Name

    LoadBalancer:
        Type: AWS::ElasticLoadBalancingV2::LoadBalancer
        Properties:
            Type: network
            Scheme: !Ref 'LoadBalancerScheme'
            Subnets:
              - Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'PublicSubnetOne']]
            Tags:
                - Key: Name
                  Value: !Join ['-', [!Ref 'EnvironmentName', !Ref 'GerritServiceName', 'nlb']]

    HTTPTargetGroup:
        Type: AWS::ElasticLoadBalancingV2::TargetGroup
        DependsOn: LoadBalancer
        Properties:
            VpcId:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'VPCId']]
            Port: !Ref HTTPHostPort
            Protocol: TCP
            HealthCheckPort: !Ref HTTPHostPort

    HTTPListener:
        Type: AWS::ElasticLoadBalancingV2::Listener
        DependsOn: LoadBalancer
        Properties:
            Certificates:
              - CertificateArn: !Ref CertificateArn
            DefaultActions:
            - Type: forward
              TargetGroupArn: !Ref HTTPTargetGroup
            LoadBalancerArn: !Ref LoadBalancer
            Port: !Ref HTTPSPort
            Protocol: TLS

    SSHTargetGroup:
        Type: AWS::ElasticLoadBalancingV2::TargetGroup
        DependsOn: LoadBalancer
        Properties:
            VpcId:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'VPCId']]
            Port: !Ref SSHHostPort
            Protocol: TCP
            HealthCheckPort: !Ref SSHHostPort

    SSHListener:
        Type: AWS::ElasticLoadBalancingV2::Listener
        DependsOn: LoadBalancer
        Properties:
            DefaultActions:
            - Type: forward
              TargetGroupArn: !Ref SSHTargetGroup
            LoadBalancerArn: !Ref LoadBalancer
            Port: !Ref SSHHostPort
            Protocol: TCP

    GitTargetGroup:
        Type: AWS::ElasticLoadBalancingV2::TargetGroup
        DependsOn: LoadBalancer
        Properties:
            VpcId:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'VPCId']]
            Port: !Ref GitPort
            Protocol: TCP

    GitListener:
        Type: AWS::ElasticLoadBalancingV2::Listener
        DependsOn: LoadBalancer
        Properties:
            DefaultActions:
            - Type: forward
              TargetGroupArn: !Ref GitTargetGroup
            LoadBalancerArn: !Ref LoadBalancer
            Port: !Ref GitPort
            Protocol: TCP

    GitSSHTargetGroup:
        Type: AWS::ElasticLoadBalancingV2::TargetGroup
        DependsOn: LoadBalancer
        Properties:
            VpcId:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'VPCId']]
            Port: !Ref GitSSHPort
            Protocol: TCP

    GitSSHListener:
        Type: AWS::ElasticLoadBalancingV2::Listener
        DependsOn: LoadBalancer
        Properties:
            DefaultActions:
            - Type: forward
              TargetGroupArn: !Ref GitSSHTargetGroup
            LoadBalancerArn: !Ref LoadBalancer
            Port: !Ref GitSSHPort
            Protocol: TCP

    ReplicaDnsRecord:
        Type: AWS::Route53::RecordSet
        Properties:
          Name: !Sub '${Subdomain}.${HostedZoneName}'
          HostedZoneName: !Sub '${HostedZoneName}.'
          Comment: DNS name for Gerrit Replica.
          Type: A
          AliasTarget:
            DNSName: !GetAtt 'LoadBalancer.DNSName'
            HostedZoneId: !GetAtt 'LoadBalancer.CanonicalHostedZoneID'
            EvaluateTargetHealth: False

    ECSTaskExecutionRoleStack:
      Type: AWS::CloudFormation::Stack
      Properties:
        TemplateURL: !Join [ '', ['https://', !Ref TemplateBucketName, '.s3.amazonaws.com/cf-gerrit-task-execution-role.yml'] ]
        TimeoutInMinutes: '5'

Outputs:
  PublicLoadBalancerDNSName:
    Description: The DNS name of the external load balancer
    Value: !GetAtt 'LoadBalancer.DNSName'
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'PublicLoadBalancerDNSName' ] ]
  CanonicalHostedZoneID:
    Description: Canonical Hosted Zone ID
    Value: !GetAtt 'LoadBalancer.CanonicalHostedZoneID'
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'CanonicalHostedZoneID' ] ]
  PublicLoadBalancerUrl:
    Description: The url of the external load balancer
    Value: !Join ['', ['http://', !GetAtt 'LoadBalancer.DNSName']]
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'PublicLoadBalancerUrl' ] ]
  HostedZoneName:
    Description: Route53 Hosted Zone name
    Value: !Ref HostedZoneName
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'HostedZoneName' ] ]
  Subdomain:
    Description: Service DNS subdomain
    Value: !Ref Subdomain
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'Subdomain' ] ]
  CanonicalWebUrl:
    Description: Canonical Web URL
    Value: !Sub 'https://${Subdomain}.${HostedZoneName}'
    Export:
      Name: !Join [ ':', [ !Ref 'AWS::StackName', 'CanonicalWebUrl' ] ]