apis

type SubConn ¶

type SubConn interface {
	// UpdateAddresses updates the addresses used in this SubConn.
	// gRPC checks if currently-connected address is still in the new list.
	// If it's in the list, the connection will be kept.
	// If it's not in the list, the connection will gracefully closed, and
	// a new connection will be created.
	//
	// This will trigger a state transition for the SubConn.
	UpdateAddresses([]resolver.Address)
	// Connect starts the connecting for this SubConn.
	Connect()
	// gets the addressConnection
	GetAddrConnection() resolver.Address
}

SubConn represents a gRPC sub connection. Each sub connection contains a list of addresses. gRPC will try to connect to them (in sequence), and stop trying the remainder once one connection is successful.

The reconnect backoff will be applied on the list, not a single address. For example, try_on_all_addresses -> backoff -> try_on_all_addresses.

All SubConns start in IDLE, and will not try to connect. To trigger the connecting, Balancers must call Connect. When the connection encounters an error, it will reconnect immediately. When the connection becomes IDLE, it will not reconnect unless Connect is called.

This interface is to be implemented by gRPC. Users should not need a brand new implementation of this interface. For the situations like testing, the new implementation should embed this interface. This allows gRPC to add new methods to this interface.