cmd/geth: implement dev mode for post-merge (#27327)

This change adds back the 'geth --dev' mode of operation, using a cl-mocker. 

---------

Co-authored-by: Martin Holst Swende <martin@swende.se>
Co-authored-by: rjl493456442 <garyrong0905@gmail.com>
Co-authored-by: lightclient <14004106+lightclient@users.noreply.github.com>

cmd/geth/config.go

@@ -32,6 +32,8 @@ import (
 	"github.com/ethereum/go-ethereum/accounts/scwallet"
 	"github.com/ethereum/go-ethereum/accounts/usbwallet"
 	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/eth/catalyst"
+	ethcatalyst "github.com/ethereum/go-ethereum/eth/catalyst"
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
@@ -193,6 +195,22 @@ func makeFullNode(ctx *cli.Context) (*node.Node, ethapi.Backend) {
 	if ctx.IsSet(utils.SyncTargetFlag.Name) && cfg.Eth.SyncMode == downloader.FullSync {
 		utils.RegisterFullSyncTester(stack, eth, ctx.Path(utils.SyncTargetFlag.Name))
 	}
+
+	// Start the dev mode if requested, or launch the engine API for
+	// interacting with external consensus client.
+	if ctx.IsSet(utils.DeveloperFlag.Name) {
+		simBeacon, err := catalyst.NewSimulatedBeacon(ctx.Uint64(utils.DeveloperPeriodFlag.Name), eth)
+		if err != nil {
+			utils.Fatalf("failed to register dev mode catalyst service: %v", err)
+		}
+		catalyst.RegisterSimulatedBeaconAPIs(stack, simBeacon)
+		stack.RegisterLifecycle(simBeacon)
+	} else if cfg.Eth.SyncMode != downloader.LightSync {
+		err := ethcatalyst.Register(stack, eth)
+		if err != nil {
+			utils.Fatalf("failed to register catalyst service: %v", err)
+		}
+	}
 	return stack, backend
 }
 

cmd/geth/main.go

@@ -128,8 +128,8 @@ var (
 		utils.NodeKeyHexFlag,
 		utils.DNSDiscoveryFlag,
 		utils.DeveloperFlag,
-		utils.DeveloperPeriodFlag,
 		utils.DeveloperGasLimitFlag,
+		utils.DeveloperPeriodFlag,
 		utils.VMEnableDebugFlag,
 		utils.NetworkIdFlag,
 		utils.EthStatsURLFlag,
@@ -408,7 +408,7 @@ func startNode(ctx *cli.Context, stack *node.Node, backend ethapi.Backend, isCon
 	}
 
 	// Start auxiliary services if enabled
-	if ctx.Bool(utils.MiningEnabledFlag.Name) || ctx.Bool(utils.DeveloperFlag.Name) {
+	if ctx.Bool(utils.MiningEnabledFlag.Name) {
 		// Mining only makes sense if a full Ethereum node is running
 		if ctx.String(utils.SyncModeFlag.Name) == "light" {
 			utils.Fatalf("Light clients do not support mining")