buildspec.yml

version: 0.2

env:
  variables:
    SERVICE_NAME: "demoapp"
    SECURITY_GROUP_NAME: ""
    VPC_NAME: ""
    TARGET_GROUP_NAME: ""
    S3_JAR_PATH: ""
    INSTANCE_TYPE: t3.medium
    PROFILE_NAME: demoapp-profile
  parameter-store:
    GITHUB_TOKEN: "/CodeBuild/GITHUB_TOKEN"

phases:
  install:
    commands:
      - aws --version

  pre_build:
    commands:
      # 환경 변수 설정
      - export NEW_LAUNCH_CONFIG_NAME=new-launch-config-$(date +%s)
      - export SECURITY_GROUP_ID=$(aws ec2 describe-security-groups --filters "Name=group-name,Values=$SECURITY_GROUP_NAME" --query "SecurityGroups[0].GroupId" --output text)  # 미리 생성된 Security Group ID
      - export VPC_ID=$(aws ec2 describe-vpcs --filters "Name=tag:Name,Values=$VPC_NAME" --query "Vpcs[0].VpcId" --output text)  # VPC ID를 환경 변수로 설정
      - export TARGET_GROUP_ARN=$(aws elbv2 describe-target-groups --names $TARGET_GROUP_NAME --query "TargetGroups[0].TargetGroupArn" --output text)
      # SUBNETS 변수를 AWS CLI를 사용해 동적으로 설정
      - echo "Retrieving private subnets for VPC..."
      - export SUBNETS=$(aws ec2 describe-subnets --filters "Name=vpc-id,Values=$VPC_ID" "Name=tag:Name,Values=private*" --query "Subnets[*].SubnetId" --output text | tr '\t' ',' | sed 's/,$//')
            # 버전 정보 설정
      - echo "Determining current ASG version..."
      - |
        highest_version=$(aws autoscaling describe-auto-scaling-groups \
            --query "AutoScalingGroups[?starts_with(AutoScalingGroupName, \`$SERVICE_NAME\`)].AutoScalingGroupName" \
            --output json | \
            jq -r ".[] | select(startswith(\"${SERVICE_NAME}-\")) | sub(\"^${SERVICE_NAME}-0*\"; \"\")" | \
            sort -nr | \
            head -n 1)
        export VERSION=$(printf "%04d" $highest_version)
      - |
        if [ -z "$VERSION" ]; then 
          export VERSION=0000;
        else
          export BLUE_ASG_NAME=${SERVICE_NAME}-${VERSION}
          echo "Old ASG version - ${BLUE_ASG_NAME}"
          export VERSION=$(printf "%04d" $((10#$VERSION + 1))); 
        fi
        export GREEN_ASG_NAME=${SERVICE_NAME}-${VERSION}
        echo "New ASG version - ${GREEN_ASG_NAME}"
  build:
    commands:
      # User Data 스크립트 생성
      - echo "Creating User Data script..."
      - cp deployment.sh /tmp/userdata.sh
      - |
        sed -i "s|DEPLOY_SERVICE_NAME|$SERVICE_NAME|g" /tmp/userdata.sh
        sed -i "s|JAR_PATH|$S3_JAR_PATH|g" /tmp/userdata.sh
  post_build:
    commands:
      # 현재 활성화된 ASG 확인 및 변수 설정
      - echo "Checking for existing ASGs..."
      - ACTIVE_ASG=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $BLUE_ASG_NAME $GREEN_ASG_NAME --query 'AutoScalingGroups[?DesiredCapacity>`0`].AutoScalingGroupName' --output text)

      # ASG가 없는 경우, 초기화 작업 수행
      - |
        if [ -z "$ACTIVE_ASG" ]; then
            echo "No active ASG found. Initializing Blue ASG...";
            export TARGET_ASG_NAME=$GREEN_ASG_NAME;
            export IS_INITIAL_DEPLOYMENT=true;
        else
            echo "Active ASG found: $ACTIVE_ASG";
            export IS_INITIAL_DEPLOYMENT=false;
            # ACTIVE_ASG가 BLUE_ASG_NAME인지 확인하고 스왑
            if [ "$ACTIVE_ASG" == "$BLUE_ASG_NAME" ]; then
                echo "Currently active ASG is $BLUE_ASG_NAME. Swapping to $GREEN_ASG_NAME...";
                export TARGET_ASG_NAME=$GREEN_ASG_NAME;
            fi
        fi

      # 새로운 Launch Configuration 생성
      - echo "Creating new Launch Configuration..."
      - aws autoscaling create-launch-configuration --launch-configuration-name $NEW_LAUNCH_CONFIG_NAME --image-id ami-0c2acfcb2ac4d02a0 --instance-type $INSTANCE_TYPE --user-data file:///tmp/userdata.sh --security-groups $SECURITY_GROUP_ID --iam-instance-profile $PROFILE_NAME

      # 최초 배포인 경우 ASG 생성, 그렇지 않으면 기존 ASG 업데이트
      - |
        echo "Creating Auto Scaling Group: $TARGET_ASG_NAME";
        aws autoscaling create-auto-scaling-group --auto-scaling-group-name $TARGET_ASG_NAME --launch-configuration-name $NEW_LAUNCH_CONFIG_NAME --min-size 1 --max-size 3 --desired-capacity 1 --target-group-arns $TARGET_GROUP_ARN --vpc-zone-identifier $SUBNETS  --tags Key=Name,Value=$TARGET_ASG_NAME Key=Service,Value=$SERVICE_NAME;
        sleep 30;

        echo "Getting instance IDs for ASG: $TARGET_ASG_NAME";
        INSTANCE_IDS=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $TARGET_ASG_NAME --query 'AutoScalingGroups[0].Instances[*].InstanceId' --output text);

        DESIRED_CAPACITY=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-names $TARGET_ASG_NAME --query 'AutoScalingGroups[0].DesiredCapacity' --output text);
        echo "Performing health checks on the new ASG...";
        MAX_RETRIES=10
        RETRY_INTERVAL=30
        ATTEMPTS=0
        HEALTHY_INSTANCES=0

        while [ $ATTEMPTS -lt $MAX_RETRIES ]; do
            HEALTHY_INSTANCES=0
            echo $INSTANCE_IDS
            for INSTANCE_ID in $INSTANCE_IDS; do
                # 인스턴스 상태 확인
                INSTANCE_HEALTH=$(aws elbv2 describe-target-health --target-group-arn $TARGET_GROUP_ARN --targets Id=$INSTANCE_ID --query 'TargetHealthDescriptions[0].TargetHealth.State' --output text)

                if [ "$INSTANCE_HEALTH" == "healthy" ]; then
                    HEALTHY_INSTANCES=$((HEALTHY_INSTANCES + 1))
                fi
            done

            if [ $HEALTHY_INSTANCES -eq $DESIRED_CAPACITY ]; then
                echo "All instances are healthy.";
                break
            else
                echo "Not all instances are healthy. Retrying in $RETRY_INTERVAL seconds...";
                sleep $RETRY_INTERVAL
            fi

              ATTEMPTS=$((ATTEMPTS + 1))
        done
        
        if [ "$IS_INITIAL_DEPLOYMENT" == "false" ]; then
          if [ $HEALTHY_INSTANCES -eq $(echo $INSTANCE_IDS | wc -w) ]; then
              echo "All instances are healthy. Proceeding with ASG deletion.";
              # 기존 Auto Scaling Group 삭제
              # 특정 이름으로 시작하는 Auto Scaling 그룹을 조회하여 삭제
              for group in $(aws autoscaling describe-auto-scaling-groups \
                  --query "AutoScalingGroups[?starts_with(AutoScalingGroupName, '${SERVICE_NAME}')].AutoScalingGroupName" \
                  --output text); do
                  # GREEN_ASG_NAME과 동일한 이름은 제외
                  if [ "$group" != "$GREEN_ASG_NAME" ]; then
                      # Auto Scaling 그룹 삭제
                      aws autoscaling delete-auto-scaling-group \
                          --auto-scaling-group-name "$group" \
                          --force-delete
                      echo "Deleted Auto Scaling Group: $group"
                  else
                      echo "Skipped Auto Scaling Group: $group (matches GREEN_ASG_NAME)"
                  fi
              done
          else
              echo "Not all instances are healthy after retries. Aborting ASG deletion.";
              exit 1
          fi
        else
              echo "All instances are healthy.";
        fi  

artifacts:
  files:
    - '**/*'