all: add debug_syncTarget as an API method

cmd/geth/config.go

@@ -262,13 +262,14 @@ func makeFullNode(ctx *cli.Context) *node.Node {
 	if cfg.Ethstats.URL != "" {
 		utils.RegisterEthStatsService(stack, backend, cfg.Ethstats.URL)
 	}
+
 	// Configure full-sync tester service if requested
 	if ctx.IsSet(utils.SyncTargetFlag.Name) {
 		hex := hexutil.MustDecode(ctx.String(utils.SyncTargetFlag.Name))
 		if len(hex) != common.HashLength {
 			utils.Fatalf("invalid sync target length: have %d, want %d", len(hex), common.HashLength)
 		}
-		utils.RegisterFullSyncTester(stack, eth, common.BytesToHash(hex), ctx.Bool(utils.ExitWhenSyncedFlag.Name))
+		eth.SyncOverride().SyncTarget(common.BytesToHash(hex), ctx.Bool(utils.ExitWhenSyncedFlag.Name))
 	}
 
 	if ctx.IsSet(utils.DeveloperFlag.Name) {

cmd/utils/flags.go

@@ -49,7 +49,6 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/crypto/kzg4844"
 	"github.com/ethereum/go-ethereum/eth"
-	"github.com/ethereum/go-ethereum/eth/catalyst"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/eth/filters"
 	"github.com/ethereum/go-ethereum/eth/gasprice"
@@ -1997,12 +1996,6 @@ func RegisterFilterAPI(stack *node.Node, backend ethapi.Backend, ethcfg *ethconf
 	return filterSystem
 }
 
-// RegisterFullSyncTester adds the full-sync tester service into node.
-func RegisterFullSyncTester(stack *node.Node, eth *eth.Ethereum, target common.Hash, exitWhenSynced bool) {
-	catalyst.RegisterFullSyncTester(stack, eth, target, exitWhenSynced)
-	log.Info("Registered full-sync tester", "hash", target, "exitWhenSynced", exitWhenSynced)
-}
-
 // SetupMetrics configures the metrics system.
 func SetupMetrics(cfg *metrics.Config) {
 	if !cfg.Enabled {

eth/api_debug.go

@@ -443,3 +443,8 @@ func (api *DebugAPI) GetTrieFlushInterval() (string, error) {
 	}
 	return api.eth.blockchain.GetTrieFlushInterval().String(), nil
 }
+
+// SetSyncTarget initiates a full-sync to the target block hash
+func (api *DebugAPI) SyncTarget(target common.Hash) {
+	api.eth.SyncOverride().SyncTarget(target, false)
+}

eth/backend.go

@@ -124,6 +124,8 @@ type Ethereum struct {
 	lock sync.RWMutex // Protects the variadic fields (e.g. gas price and etherbase)
 
 	shutdownTracker *shutdowncheck.ShutdownTracker // Tracks if and when the node has shutdown ungracefully
+
+	syncOverride SyncOverride // allows the sync target to be overridden
 }
 
 // New creates a new Ethereum object (including the initialisation of the common Ethereum object),
@@ -202,6 +204,11 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		discmix:         enode.NewFairMix(discmixTimeout),
 		shutdownTracker: shutdowncheck.NewShutdownTracker(chainDb),
 	}
+	eth.syncOverride = SyncOverride{
+		stack:   stack,
+		backend: eth,
+		closed:  make(chan struct{}),
+	}
 	bcVersion := rawdb.ReadDatabaseVersion(chainDb)
 	var dbVer = "<nil>"
 	if bcVersion != nil {
@@ -576,6 +583,8 @@ func (s *Ethereum) Stop() error {
 	s.chainDb.Close()
 	s.eventMux.Stop()
 
+	s.syncOverride.Stop()
+
 	return nil
 }
 
@@ -604,3 +613,9 @@ func (s *Ethereum) SyncMode() ethconfig.SyncMode {
 	// Nope, we're really full syncing
 	return ethconfig.FullSync
 }
+
+// SyncOverride returns a SyncOverride instance which is used to force the node
+// to sync to a target block hash.
+func (s *Ethereum) SyncOverride() *SyncOverride {
+	return &s.syncOverride
+}

eth/sync_override.go

@@ -14,57 +14,35 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
-package catalyst
+package eth
 
 import (
-	"sync"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/node"
 )
 
-// FullSyncTester is an auxiliary service that allows Geth to perform full sync
+// SyncOverride is an auxiliary service that allows Geth to perform full sync
 // alone without consensus-layer attached. Users must specify a valid block hash
 // as the sync target.
 //
 // This tester can be applied to different networks, no matter it's pre-merge or
 // post-merge, but only for full-sync.
-type FullSyncTester struct {
+type SyncOverride struct {
 	stack   *node.Node
-	backend        *eth.Ethereum
-	target         common.Hash
+	backend *Ethereum
 	closed  chan struct{}
-	wg             sync.WaitGroup
-	exitWhenSynced bool
 }
 
-// RegisterFullSyncTester registers the full-sync tester service into the node
-// stack for launching and stopping the service controlled by node.
-func RegisterFullSyncTester(stack *node.Node, backend *eth.Ethereum, target common.Hash, exitWhenSynced bool) (*FullSyncTester, error) {
-	cl := &FullSyncTester{
-		stack:          stack,
-		backend:        backend,
-		target:         target,
-		closed:         make(chan struct{}),
-		exitWhenSynced: exitWhenSynced,
-	}
-	stack.RegisterLifecycle(cl)
-	return cl, nil
-}
-
-// Start launches the beacon sync with provided sync target.
-func (tester *FullSyncTester) Start() error {
-	tester.wg.Add(1)
+// SyncTarget sets the target of the client sync to the given block hash
+func (f *SyncOverride) SyncTarget(target common.Hash, exitWhenSynced bool) {
 	go func() {
-		defer tester.wg.Done()
-
 		// Trigger beacon sync with the provided block hash as trusted
 		// chain head.
-		err := tester.backend.Downloader().BeaconDevSync(ethconfig.FullSync, tester.target, tester.closed)
+		err := f.backend.Downloader().BeaconDevSync(ethconfig.FullSync, target, f.closed)
 		if err != nil {
 			log.Info("Failed to trigger beacon sync", "err", err)
 		}
@@ -76,28 +54,25 @@ func (tester *FullSyncTester) Start() error {
 			select {
 			case <-ticker.C:
 				// Stop in case the target block is already stored locally.
-				if block := tester.backend.BlockChain().GetBlockByHash(tester.target); block != nil {
+				if block := f.backend.BlockChain().GetBlockByHash(target); block != nil {
 					log.Info("Full-sync target reached", "number", block.NumberU64(), "hash", block.Hash())
-
-					if tester.exitWhenSynced {
-						go tester.stack.Close() // async since we need to close ourselves
-						log.Info("Terminating the node")
+					if exitWhenSynced {
+						log.Info("Terminating node")
+						f.stack.Close()
 					}
 					return
 				}
 
-			case <-tester.closed:
+			case <-f.closed:
 				return
 			}
 		}
 	}()
-	return nil
 }
 
 // Stop stops the full-sync tester to stop all background activities.
 // This function can only be called for one time.
-func (tester *FullSyncTester) Stop() error {
-	close(tester.closed)
-	tester.wg.Wait()
+func (f *SyncOverride) Stop() error {
+	close(f.closed)
 	return nil
 }

internal/web3ext/web3ext.go

@@ -468,6 +468,11 @@ web3._extend({
 			call: 'debug_getTrieFlushInterval',
 			params: 0
 		}),
+		new web3._extend.Method({
+			name: 'syncTarget',
+			call: 'debug_syncTarget',
+			params: 1
+		}),
 	],
 	properties: []
 });