feat: add system config consensus to deprecate poa

cmd/faucet/faucet.go

@@ -254,7 +254,7 @@ func newFaucet(genesis *core.Genesis, port int, enodes []*enode.Node, network ui
 	cfg.Genesis = genesis
 	utils.SetDNSDiscoveryDefaults(&cfg, genesis.ToBlock(nil).Hash())
 
-	lesBackend, err := les.New(stack, &cfg)
+	lesBackend, err := les.New(stack, &cfg, nil)
 	if err != nil {
 		return nil, fmt.Errorf("Failed to register the Ethereum service: %w", err)
 	}

cmd/utils/flags.go

@@ -1943,16 +1943,6 @@ func SetDNSDiscoveryDefaults(cfg *ethconfig.Config, genesis common.Hash) {
 // The second return value is the full node instance, which may be nil if the
 // node is running as a light client.
 func RegisterEthService(stack *node.Node, cfg *ethconfig.Config) (ethapi.Backend, *eth.Ethereum) {
-	if cfg.SyncMode == downloader.LightSync {
-		backend, err := les.New(stack, cfg)
-		if err != nil {
-			Fatalf("Failed to register the Ethereum service: %v", err)
-		}
-		scrollTracerWrapper := tracing.NewTracerWrapper()
-		stack.RegisterAPIs(tracers.APIs(backend.ApiBackend, scrollTracerWrapper))
-		return backend.ApiBackend, nil
-	}
-
 	// initialize L1 client for sync service
 	// note: we need to do this here to avoid circular dependency
 	l1EndpointUrl := stack.Config().L1Endpoint
@@ -1968,6 +1958,16 @@ func RegisterEthService(stack *node.Node, cfg *ethconfig.Config) (ethapi.Backend
 		log.Info("Initialized L1 client", "endpoint", l1EndpointUrl)
 	}
 
+	if cfg.SyncMode == downloader.LightSync {
+		backend, err := les.New(stack, cfg, l1Client)
+		if err != nil {
+			Fatalf("Failed to register the Ethereum service: %v", err)
+		}
+		scrollTracerWrapper := tracing.NewTracerWrapper()
+		stack.RegisterAPIs(tracers.APIs(backend.ApiBackend, scrollTracerWrapper))
+		return backend.ApiBackend, nil
+	}
+
 	backend, err := eth.New(stack, cfg, l1Client)
 	if err != nil {
 		Fatalf("Failed to register the Ethereum service: %v", err)

consensus/system_contract/api.go

@@ -0,0 +1,18 @@
+package system_contract
+
+import (
+	"github.com/scroll-tech/go-ethereum/common"
+	"github.com/scroll-tech/go-ethereum/consensus"
+	"github.com/scroll-tech/go-ethereum/rpc"
+)
+
+// API is a user facing RPC API to allow controlling the signer and voting
+// mechanisms of the proof-of-authority scheme.
+type API struct {
+	chain  consensus.ChainHeaderReader
+}
+
+// GetSigners retrieves the list of authorized signers at the specified block.
+func (api *API) GetSigners(number *rpc.BlockNumber) ([]common.Address, error) {
+	return nil, nil
+}