rpc: new RPC implementation with pub/sub support

node/service.go

@@ -23,6 +23,7 @@ import (
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/p2p"
+	rpc "github.com/ethereum/go-ethereum/rpc/v2"
 )
 
 // ServiceContext is a collection of service independent options inherited from
@@ -70,6 +71,9 @@ type Service interface {
 	// Protocol retrieves the P2P protocols the service wishes to start.
 	Protocols() []p2p.Protocol
 
+	// APIs retrieves the list of RPC descriptors the service provides
+	APIs() []rpc.API
+
 	// Start is called after all services have been constructed and the networking
 	// layer was also initialized to spawn any goroutines required by the service.
 	Start(server *p2p.Server) error