loadbalancer

type HealthCheck struct {
	// BackendPort is the port on a backend node to probe
	BackendPort int
	// Healthy is the number of tries to succeed to be considered healthy
	Healthy int
	// Unhealthy is the number of tries to fail to be considered unhealthy
	Unhealthy int
	// Interval is the probe / ping interval
	Interval time.Duration
	// Timeout is the duration to wait before timing out.
	Timeout time.Duration
}

type L4 interface {

	// Name is the name of the load balancer
	Name() string

	// Routes lists all known routes.
	Routes() ([]Route, error)

	// Publish publishes a route in the LB by adding a load balancing rule
	Publish(route Route) (Result, error)

	// Unpublish dissociates the load balancer from the backend service at the given port.
	Unpublish(extPort int) (Result, error)

	// ConfigureHealthCheck configures the health checks for instance removal and reconfiguration
	// The parameters healthy and unhealthy indicate the number of consecutive success or fail pings required to
	// mark a backend instance as healthy or unhealthy.   The ping occurs on the backendPort parameter and
	// at the interval specified.
	ConfigureHealthCheck(hc HealthCheck) (Result, error)

	// RegisterBackend registers instances identified by the IDs to the LB's backend pool
	RegisterBackends(ids []instance.ID) (Result, error)

	// DeregisterBackend removes the specified instances from the backend pool
	DeregisterBackends(id []instance.ID) (Result, error)

	// Backends returns a list of backends
	Backends() ([]instance.ID, error)
}

type Protocol string

type Result interface {
	fmt.Stringer
}

type Route struct {
	// Port is the TCP port that the backend instance is listening on.
	Port int

	// Protocol is the network protocol that the backend instance is listening on.
	Protocol Protocol

	// LoadBalancerPort is the TCP port that the load balancer is listening on.
	LoadBalancerPort int

	// LoadBalancerProtocol is the network protocol that the load balancer is listening on.
	LoadBalancerProtocol Protocol

	// Certificate is the certificate used by the load balancer.
	Certificate *string
}