AWSTemplateFormatVersion: '2010-09-09'
Description: Deploy a service into an ECS cluster behind a public load balancer.
Parameters:
  GerritServiceName:
    Type: String
    Default: gerrit-primary
  ReplicaServiceStackName:
    Type: String
    Default: gerrit-replica
  TemplateBucketName:
    Description: S3 bucket containing cloudformation templates
    Type: String
  ClusterStackName:
      Description: Stack name of the ECS cluster to deply the serivces
      Type: String
      Default: gerrit-cluster
  EnvironmentName:
      Description: An environment name used to build the log stream names
      Type: String
      Default: test
  DockerImage:
        Description: Gerrit official Docker image
        Type: String
        Default: aws-gerrit/gerrit:latest
  GerritLBDockerImage:
        Description: Load Balancer official Docker image
        Type: String
        Default: haproxy:1.7
  DockerRegistryUrl:
        Description: Docker registry URL
        Type: String
  DesiredCount:
        Description: How many instances of this task should we run across our cluster?
        Type: Number
        Default: 1
  HTTPPort:
        Description: Gerrit HTTP port
        Type: Number
        Default: 8080
  HTTPSPort:
        Description: Gerrit HTTPS port
        Type: Number
        Default: 443
  SSHPort:
        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
  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-primary-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]
  ReplicaSubdomain:
        Description: The subdomain of the Gerrit replica
        Type: String
  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}))
  SMTPServer:
      Description: SMTP server URL
      Type: String
  SMTPServerPort:
      Description: SMTP server port
      Type: Number
      Default: 465
  SMTPUser:
      Description: User name to authenticate with, if required for relay
      Type: String
  SMTPDomain:
      Description: Domain to be used in the From field
      Type: String
  SMTPEncryption:
      Description: Encryption to be used
      Type: String
      Default: ssl
      AllowedValues: ['ssl', 'tls', 'none']
  SMTPSslVerify:
      Description: If false and SMTPEncryption is 'ssl' or 'tls', Gerrit will not verify the server certificate when it connects to send an email message.
      Type: String
      Default: true
      AllowedValues: [true, false]
  InstanceId:
    Description: Optional identifier for the Gerrit instance
    Type: String
    Default: gerrit-primary-replica-PRIMARY
  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: ''

Mappings:
  Gerrit:
    Volume:
      Git: gerrit-git
      Data: gerrit-data
      Index: gerrit-index
      Cache: gerrit-cache
      Db: gerrit-db
      Logs: gerrit-logs

Resources:
    Service:
        Type: AWS::ECS::Service
        DependsOn:
          - HTTPListener
          - SSHListener
        Properties:
            Cluster:
              Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'ClusterName']]
            DesiredCount: !Ref DesiredCount
            TaskDefinition: !Ref TaskDefinition
            LoadBalancers:
                - ContainerName: !Ref GerritServiceName
                  ContainerPort: !Ref HTTPPort
                  TargetGroupArn: !Ref HTTPTargetGroup
                - ContainerName: !Ref GerritServiceName
                  ContainerPort: !Ref SSHPort
                  TargetGroupArn: !Ref SSHTargetGroup

    TaskDefinition:
        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 == primary'
                Type: "memberOf"
            ContainerDefinitions:
                - Name: !Ref GerritServiceName
                  Essential: true
                  Image: !Sub '${DockerRegistryUrl}/${DockerImage}'
                  Environment:
                    - Name: CANONICAL_WEB_URL
                      Value: !Sub 'https://${Subdomain}.${HostedZoneName}'
                    - Name: HTTPD_LISTEN_URL
                      Value: !Sub 'proxy-https://*:${HTTPPort}/'
                    - Name: AWS_REGION
                      Value: !Ref AWS::Region
                    - Name: SETUP_REPLICATION
                      Value: true
                    - Name: GERRIT_KEY_PREFIX
                      Value: !Ref GerritKeyPrefix
                    - 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: SMTP_SERVER
                      Value: !Ref SMTPServer
                    - Name: SMTP_SERVER_PORT
                      Value: !Ref SMTPServerPort
                    - Name: SMTP_ENCRYPTION
                      Value: !Ref SMTPEncryption
                    - Name: SMTP_SSL_VERIFY
                      Value: !Ref SMTPSslVerify
                    - Name: SMTP_USER
                      Value: !Ref SMTPUser
                    - Name: SMTP_DOMAIN
                      Value: !Ref SMTPDomain
                    - Name: GERRIT_INSTANCE_ID
                      Value: !Ref InstanceId
                    - Name: GIT_PORT
                      Value: !Ref GitPort
                    - Name: GIT_SSH_PORT
                      Value: !Ref GitSSHPort
                    - Name: REPLICA_SUBDOMAIN
                      Value: !Ref ReplicaSubdomain
                    - Name: HOSTED_ZONE_NAME
                      Value: !Ref HostedZoneName
                    - Name: REINDEX_AT_STARTUP
                      Value: false
                    - 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: !FindInMap ['Gerrit', 'Volume', 'Git']
                      ContainerPath: /var/gerrit/git
                    - SourceVolume: !FindInMap ['Gerrit', 'Volume', 'Data']
                      ContainerPath: /var/gerrit/data
                    - SourceVolume: !FindInMap ['Gerrit', 'Volume', 'Index']
                      ContainerPath: /var/gerrit/index
                    - SourceVolume: !FindInMap ['Gerrit', 'Volume', 'Cache']
                      ContainerPath: /var/gerrit/cache
                    - SourceVolume: !FindInMap ['Gerrit', 'Volume', 'Db']
                      ContainerPath: /var/gerrit/db
                    - SourceVolume: !FindInMap ['Gerrit', 'Volume', 'Logs']
                      ContainerPath: /var/gerrit/logs
                  Cpu: !Ref GerritCPU
                  Memory: !Ref GerritRAM
                  PortMappings:
                    - ContainerPort: !Ref HTTPPort
                      HostPort: !Ref HTTPPort
                      Protocol: tcp
                    - ContainerPort: !Ref SSHPort
                      HostPort: !Ref SSHPort
                      Protocol: tcp
                  LogConfiguration:
                    LogDriver: awslogs
                    Options:
                        awslogs-group: !Ref ClusterStackName
                        awslogs-region: !Ref AWS::Region
                        awslogs-stream-prefix: !Ref EnvironmentName
            Volumes:
              - Name: !FindInMap ['Gerrit', 'Volume', 'Db']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Db']]]
              - Name: !FindInMap ['Gerrit', 'Volume', 'Git']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Git']]]
              - Name: !FindInMap ['Gerrit', 'Volume', 'Data']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Data']]]
              - Name: !FindInMap ['Gerrit', 'Volume', 'Cache']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Cache']]]
              - Name: !FindInMap ['Gerrit', 'Volume', 'Index']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Index']]]
              - Name: !FindInMap ['Gerrit', 'Volume', 'Logs']
                Host:
                  SourcePath: !Join ['/', ["/gerrit-mount-point", !FindInMap ['Gerrit', 'Volume', 'Logs']]]

    LoadBalancer:
        Type: AWS::ElasticLoadBalancingV2::LoadBalancer
        Properties:
            Type: network
            Scheme: !Ref 'LoadBalancerScheme'
            LoadBalancerAttributes:
              - Key: 'load_balancing.cross_zone.enabled'
                Value: true
            Subnets:
              - Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'PublicSubnetOne']]
              - Fn::ImportValue:
                  !Join [':', [!Ref 'ClusterStackName', 'PublicSubnetTwo']]
            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 HTTPPort
            Protocol: TCP
            HealthCheckProtocol: HTTP
            HealthCheckPort: !Ref HTTPPort
            HealthCheckPath: '/config/server/healthcheck~status'
            Name: 'gerrit-primary-http'

    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 SSHPort
            Protocol: TCP
            HealthCheckProtocol: HTTP
            HealthCheckPort: !Ref HTTPPort
            HealthCheckPath: '/config/server/healthcheck~status'
            Name: 'gerrit-primary-ssh'

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

    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' ] ]