Add Block Batch Limit Flag

beacon-chain/flags/base.go

@@ -116,4 +116,10 @@ var (
 		Name:  "disable-discv5",
 		Usage: "Does not run the discoveryV5 dht.",
 	}
+	// BlockBatchLimit specifies the requested block batch size.
+	BlockBatchLimit = &cli.IntFlag{
+		Name:  "block-batch-limit",
+		Usage: "The amount of blocks the local peer is bounded to request and respond to in a batch.",
+		Value: 64,
+	}
 )

beacon-chain/flags/config.go

@@ -18,6 +18,7 @@ type GlobalFlags struct {
 	MinimumSyncPeers                  int
 	MaxPageSize                       int
 	DeploymentBlock                   int
+	BlockBatchLimit                   int
 }
 
 var globalConfig *GlobalFlags
@@ -57,6 +58,7 @@ func ConfigureGlobalFlags(ctx *cli.Context) {
 	if ctx.Bool(DisableDiscv5.Name) {
 		cfg.DisableDiscv5 = true
 	}
+	cfg.BlockBatchLimit = ctx.Int(BlockBatchLimit.Name)
 	cfg.MaxPageSize = ctx.Int(RPCMaxPageSize.Name)
 	cfg.DeploymentBlock = ctx.Int(ContractDeploymentBlock.Name)
 	configureMinimumPeers(ctx, cfg)

beacon-chain/main.go

@@ -40,6 +40,7 @@ var appFlags = []cli.Flag{
 	flags.SetGCPercent,
 	flags.UnsafeSync,
 	flags.DisableDiscv5,
+	flags.BlockBatchLimit,
 	flags.InteropMockEth1DataVotesFlag,
 	flags.InteropGenesisStateFlag,
 	flags.InteropNumValidatorsFlag,

beacon-chain/sync/BUILD.bazel

@@ -47,6 +47,7 @@ go_library(
         "//beacon-chain/core/state/interop:go_default_library",
         "//beacon-chain/db:go_default_library",
         "//beacon-chain/db/filters:go_default_library",
+        "//beacon-chain/flags:go_default_library",
         "//beacon-chain/operations/attestations:go_default_library",
         "//beacon-chain/operations/slashings:go_default_library",
         "//beacon-chain/operations/voluntaryexits:go_default_library",

beacon-chain/sync/rpc_beacon_blocks_by_range.go

@@ -38,8 +38,8 @@ func (r *Service) beaconBlocksByRangeRPCHandler(ctx context.Context, msg interfa
 
 	// The initial count for the first batch to be returned back.
 	count := m.Count
-	if count > allowedBlocksPerSecond {
-		count = allowedBlocksPerSecond
+	if count > uint64(allowedBlocksPerSecond) {
+		count = uint64(allowedBlocksPerSecond)
 	}
 	// initial batch start and end slots to be returned to remote peer.
 	startSlot := m.StartSlot
@@ -60,7 +60,7 @@ func (r *Service) beaconBlocksByRangeRPCHandler(ctx context.Context, msg interfa
 	for startSlot <= endReqSlot {
 		remainingBucketCapacity = r.blocksRateLimiter.Remaining(stream.Conn().RemotePeer().String())
 
-		if allowedBlocksPerSecond > uint64(remainingBucketCapacity) {
+		if int64(allowedBlocksPerSecond) > remainingBucketCapacity {
 			r.p2p.Peers().IncrementBadResponses(stream.Conn().RemotePeer())
 			if r.p2p.Peers().IsBad(stream.Conn().RemotePeer()) {
 				log.Debug("Disconnecting bad peer")
@@ -89,7 +89,7 @@ func (r *Service) beaconBlocksByRangeRPCHandler(ctx context.Context, msg interfa
 
 		// Recalculate start and end slots for the next batch to be returned to the remote peer.
 		startSlot = endSlot + m.Step
-		endSlot = startSlot + (m.Step * (allowedBlocksPerSecond - 1))
+		endSlot = startSlot + (m.Step * (uint64(allowedBlocksPerSecond) - 1))
 		if endSlot > endReqSlot {
 			endSlot = endReqSlot
 		}

beacon-chain/sync/service.go

@@ -5,6 +5,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/prysmaticlabs/prysm/beacon-chain/flags"
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/kevinms/leakybucket-go"
 	"github.com/pkg/errors"
@@ -27,8 +28,9 @@ import (
 
 var _ = shared.Service(&Service{})
 
-const allowedBlocksPerSecond = 32.0
-const allowedBlocksBurst = 10 * allowedBlocksPerSecond
+var allowedBlocksPerSecond float64
+var allowedBlocksBurst int64
+
 const rangeLimit = 1000
 const seenBlockSize = 1000
 const seenAttSize = 10000
@@ -102,6 +104,10 @@ type Service struct {
 
 // NewRegularSync service.
 func NewRegularSync(cfg *Config) *Service {
+	// Intialize block limits.
+	allowedBlocksPerSecond = float64(flags.Get().BlockBatchLimit)
+	allowedBlocksBurst = int64(10 * allowedBlocksPerSecond)
+
 	ctx, cancel := context.WithCancel(context.Background())
 	r := &Service{
 		ctx:                  ctx,

beacon-chain/sync/service_test.go

@@ -11,6 +11,11 @@ import (
 	pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
 )
 
+func init() {
+	allowedBlocksPerSecond = 64
+	allowedBlocksBurst = int64(10 * allowedBlocksPerSecond)
+}
+
 func TestService_StatusZeroEpoch(t *testing.T) {
 	bState, err := stateTrie.InitializeFromProto(&pb.BeaconState{Slot: 0})
 	if err != nil {

beacon-chain/usage.go

@@ -93,6 +93,7 @@ var appHelpFlagGroups = []flagGroup{
 			flags.UnsafeSync,
 			flags.SlotsPerArchivedPoint,
 			flags.DisableDiscv5,
+			flags.BlockBatchLimit,
 		},
 	},
 	{