open-consul/agent/router/grpc.go

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package router
import "github.com/hashicorp/consul/agent/metadata"
// ServerTracker is called when Router is notified of a server being added or
// removed.
type ServerTracker interface {
NewRebalancer(dc string) func()
AddServer(*metadata.Server)
RemoveServer(*metadata.Server)
}
// Rebalancer is called periodically to re-order the servers so that the load on the
// servers is evenly balanced.
type Rebalancer func()
// NoOpServerTracker is a ServerTracker that does nothing. Used when gRPC is not
// enabled.
type NoOpServerTracker struct{}
// Rebalance does nothing
func (NoOpServerTracker) NewRebalancer(string) func() {
return func() {}
}
// AddServer does nothing
func (NoOpServerTracker) AddServer(*metadata.Server) {}
// RemoveServer does nothing
func (NoOpServerTracker) RemoveServer(*metadata.Server) {}