constructor()

in src/constructs/loadbalancing/alb/application-target-group.ts [46:68]

• 16 lines of code
• 2 McCabe index (conditional complexity)

  constructor(scope: GuStack, id: string, props: GuApplicationTargetGroupProps) {
    const mergedProps: ApplicationTargetGroupProps = {
      protocol: ApplicationProtocol.HTTP, // We terminate HTTPS at the load balancer level, so load balancer to ASG/EC2 traffic can be over HTTP
      deregistrationDelay: Duration.seconds(30),
      ...props,
      healthCheck: { ...GuApplicationTargetGroup.DefaultHealthCheck, ...props.healthCheck },
    };

    super(scope, id, mergedProps);

    const interval = mergedProps.healthCheck?.interval ?? GuApplicationTargetGroup.defaultHealthcheckInterval;
    const timeout = mergedProps.healthCheck?.timeout ?? GuApplicationTargetGroup.defaultHealthcheckTimeout;

    /*
    The healthcheck `timeout` must be lower than `interval`
    See https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-elb-health-check.html#cfn-elb-healthcheck-timeout
     */
    if (timeout.toSeconds() >= interval.toSeconds()) {
      const message = `Illegal healthcheck configuration: timeout (${timeout.toSeconds()}) must be lower than interval (${interval.toSeconds()})`;
      Annotations.of(this).addError(message); // adds a useful message to the console to aid debugging
      throw new Error(message);
    }
  }