AWSTemplateFormatVersion: '2010-09-09'
Description: Deploy a service into an ECS cluster behind a public load balancer.
Parameters:
  GerritServiceName:
    Type: String
    Default: gerrit-master
  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 that will be prefixed to resource names
      Type: String
      Default: test
  DockerImage:
        Description: Gerrit official Docker image
        Type: String
        Default: aws-gerrit/gerrit:latest
  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
  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-master-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]
  GerritKeyPrefix:
        Description: Gerrit credentials keys prefix
        Type: String
  GerritGitVolume:
      Description: Gerrit git volume name
      Type: String
      Default: gerrit-git
  GerritDataVolume:
      Description: Gerrit data volume name
      Type: String
      Default: gerrit-data
  GerritIndexVolume:
      Description: Gerrit index volume name
      Type: String
      Default: gerrit-index
  GerritLogsVolume:
      Description: Gerrit logs volume name
      Type: String
      Default: gerrit-logs
  GerritCacheVolume:
      Description: Gerrit cache volume name
      Type: String
      Default: gerrit-cache
  GerritDbVolume:
      Description: Gerrit db volume name
      Type: String
      Default: gerrit-db
  GerritRAM:
      Description: RAM to allocate to the Gerrit container
      Type: Number
      Default: 70000
  GerritCPU:
      Description: vCPU to allocate to the Gerrit container
      Type: Number
      Default: 10240
  GerritHeapLimit:
      Description: Gerrit Heap limit
      Type: String
      Default: 35g
  JgitCacheSize:
      Description: JGit cache size
      Type: String
      Default: 12g
  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
  SMTPServer:
      Description: SMTP server URL
      Type: String
  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
  InstanceId:
      Description: Optional identifier for the Gerrit instance
      Type: String
      Default: gerrit-single-master
  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: ''

Conditions:
  CreateCloudwatchDashboard: !Equals [!Ref MetricsCloudwatchEnabled, true]
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
            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: GERRIT_KEY_PREFIX
                      Value: !Ref GerritKeyPrefix
                    - Name: GERRIT_HEAP_LIMIT
                      Value: !Ref GerritHeapLimit
                    - Name: JGIT_CACHE_SIZE
                      Value: !Ref JgitCacheSize
                    - 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: SMTP_SERVER
                      Value: !Ref SMTPServer
                    - Name: SMTP_USER
                      Value: !Ref SMTPUser
                    - Name: SMTP_DOMAIN
                      Value: !Ref SMTPDomain
                    - 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]
                  MountPoints:
                    - SourceVolume: !Ref GerritGitVolume
                      ContainerPath: /var/gerrit/git
                    - SourceVolume: !Ref GerritDataVolume
                      ContainerPath: /var/gerrit/data
                    - SourceVolume: !Ref GerritIndexVolume
                      ContainerPath: /var/gerrit/index
                    - 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 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: !Ref 'GerritDbVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-db: !Join ['-', [!Ref EnvironmentName, !Ref GerritDbVolume]]
              - Name: !Ref 'GerritGitVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-git: !Join ['-', [!Ref EnvironmentName, !Ref GerritGitVolume]]
              - 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 'GerritIndexVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-index: !Join ['-', [!Ref EnvironmentName, !Ref GerritIndexVolume]]
              - Name: !Ref 'GerritLogsVolume'
                DockerVolumeConfiguration:
                  Scope: shared
                  Autoprovision: true
                  Driver: local
                  Labels:
                    gerrit-logs: !Join ['-', [!Ref EnvironmentName, !Ref GerritLogsVolume]]

    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 HTTPPort
            Protocol: TCP

    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

    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'

    CloudWatchDashboard:
      Type: AWS::CloudWatch::Dashboard
      Condition: CreateCloudwatchDashboard
      Properties:
          DashboardName: !Ref AWS::StackName
          DashboardBody: !Sub |
                {
                    "start": "-PT6H",
                    "periodOverride": "auto",
                    "widgets": [
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 0,
                            "width": 24,
                            "height": 3,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "sshd/sessions/connected", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "singleValue",
                                "region": "${AWS::Region}",
                                "stat": "Maximum",
                                "period": 60,
                                "title": "SSH Connection",
                                "stacked": false
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "RATE(METRICS())", "label": "Expression1", "id": "e1", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/usage", "InstanceId", "${InstanceId}", "Type", "gauge", { "id": "m1", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "title": "Gerrit Cpu Load",
                                "yAxis": {
                                    "right": {
                                        "showUnits": true
                                    },
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 33,
                            "width": 12,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/cache_used", "InstanceId", "${InstanceId}", "Type", "gauge", { "id": "m1" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": ""
                                    }
                                },
                                "title": "JGit Cache",
                                "period": 60,
                                "stat": "Average"
                            }
                        },
                        {
                            "type": "metric",
                            "x": 18,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jvm.memory.total.used", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                },
                                "stat": "Average",
                                "period": 60,
                                "title": "Gerrit Used memory"
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "proc/cpu/system_load", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "Gerrit System Load",
                                "region": "${AWS::Region}",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                },
                                "stat": "Average",
                                "period": 60
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jvm.gc.G1-Old-Generation.time", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "GC Time",
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "proc/jvm/thread/num_live", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "Active Threads",
                                "region": "${AWS::Region}",
                                "period": 60,
                                "stat": "Average",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "http/server/rest_api/server_latency_total", "InstanceId", "${InstanceId}", "Type", "99.9%", { "id": "m2" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "stat": "Average",
                                "period": 60,
                                "title": "HTTP requests latency",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": "ms"
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 6,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "m1+m2", "label": "HTTP hits per second", "id": "e2", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "http/server/success_count_total", "InstanceId", "${InstanceId}", "Type", "count", { "id": "m2", "visible": false } ],
                                    [ ".", "http/server/error_count_total", ".", ".", ".", ".", { "id": "m1", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "HTTP hits per second",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "label": "ops",
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 15,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "(m1/(m1+m2))*100", "label": "% of HTTP Errors", "id": "e1", "region": "${AWS::Region}" } ],
                                    [ "${MetricsCloudwatchNamespace}", "http/server/error_count_total", "InstanceId", "${InstanceId}", "Type", "count", { "id": "m1", "visible": false } ],
                                    [ ".", "http/server/success_count_total", ".", ".", ".", ".", { "id": "m2", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "title": "% of HTTP Errors",
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "max": 100,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 12,
                            "y": 9,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "git/upload-pack/request_count_total", "InstanceId", "${InstanceId}", "Type", "count", { "id": "m1" } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "title": "Git upload pack - count",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 21,
                            "width": 24,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ { "expression": "RATE(METRICS())*PERIOD(m1)", "label": "Expression1", "id": "e1" } ],
                                    [ "${MetricsCloudwatchNamespace}", "queue/index_batch/total_scheduled_tasks_count", "InstanceId", "${InstanceId}", "Type", "gauge", { "id": "m1", "visible": false } ],
                                    [ ".", "queue/receive_commits/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m2", "visible": false } ],
                                    [ ".", "queue/work_queue/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m3", "visible": false } ],
                                    [ ".", "queue/ssh_command_start/total_scheduled_tasks_count", ".", ".", ".", ".", { "id": "m4", "visible": false } ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "Scheduled Tasks Queues",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false,
                                        "min": 0
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 27,
                            "width": 24,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "queue/send_email/scheduled_tasks", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "title": "Scheduled email tasks in the queue",
                                "stat": "Sum",
                                "period": 300,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 33,
                            "width": 12,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "${MetricsCloudwatchNamespace}", "jgit/block_cache/open_files", "InstanceId", "${InstanceId}", "Type", "gauge" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "title": "Pack files cached",
                                "region": "${AWS::Region}",
                                "stat": "Sum",
                                "period": 60,
                                "yAxis": {
                                    "left": {
                                        "showUnits": false
                                    }
                                }
                            }
                        },
                        {
                            "type": "metric",
                            "x": 0,
                            "y": 3,
                            "width": 6,
                            "height": 6,
                            "properties": {
                                "metrics": [
                                    [ "AWS/EC2", "CPUUtilization" ]
                                ],
                                "view": "timeSeries",
                                "stacked": true,
                                "region": "${AWS::Region}",
                                "title": "Cluster CPU Load",
                                "period": 60,
                                "stat": "Average"
                            }
                        }
                    ]
                }

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' ] ]