eth, les, cmd: limit LES connections, add ethpeers flag

cmd/geth/main.go

@@ -85,6 +85,7 @@ var (
 		utils.FastSyncFlag,
 		utils.LightModeFlag,
 		utils.SyncModeFlag,
+		utils.EthPeersFlag,
 		utils.LightServFlag,
 		utils.LightPeersFlag,
 		utils.LightKDFFlag,

cmd/geth/usage.go

@@ -22,10 +22,11 @@ import (
 	"io"
 	"sort"
 
+	"strings"
+
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/internal/debug"
 	"gopkg.in/urfave/cli.v1"
-	"strings"
 )
 
 // AppHelpTemplate is the test template for the default, global app help topic.
@@ -76,6 +77,7 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.SyncModeFlag,
 			utils.EthStatsURLFlag,
 			utils.IdentityFlag,
+			utils.EthPeersFlag,
 			utils.LightServFlag,
 			utils.LightPeersFlag,
 			utils.LightKDFFlag,

cmd/utils/flags.go

@@ -171,6 +171,11 @@ var (
 		Value: &defaultSyncMode,
 	}
 
+	EthPeersFlag = cli.IntFlag{
+		Name:  "ethpeers",
+		Usage: "Maximum number of ETH peers",
+		Value: 25,
+	}
 	LightServFlag = cli.IntFlag{
 		Name:  "lightserv",
 		Usage: "Maximum percentage of time allowed for serving LES requests (0-90)",
@@ -179,7 +184,7 @@ var (
 	LightPeersFlag = cli.IntFlag{
 		Name:  "lightpeers",
 		Usage: "Maximum number of LES client peers",
-		Value: 20,
+		Value: 100,
 	}
 	LightKDFFlag = cli.BoolFlag{
 		Name:  "lightkdf",
@@ -433,7 +438,7 @@ var (
 	MaxPeersFlag = cli.IntFlag{
 		Name:  "maxpeers",
 		Usage: "Maximum number of network peers (network disabled if set to 0)",
-		Value: 25,
+		Value: 125,
 	}
 	MaxPendingPeersFlag = cli.IntFlag{
 		Name:  "maxpendpeers",
@@ -791,7 +796,10 @@ func SetP2PConfig(ctx *cli.Context, cfg *p2p.Config) {
 
 	if ctx.GlobalIsSet(MaxPeersFlag.Name) {
 		cfg.MaxPeers = ctx.GlobalInt(MaxPeersFlag.Name)
+	} else if ctx.GlobalIsSet(EthPeersFlag.Name) || ctx.GlobalIsSet(LightPeersFlag.Name) {
+		cfg.MaxPeers = ctx.GlobalInt(EthPeersFlag.Name) + ctx.GlobalInt(LightPeersFlag.Name)
 	}
+
 	if ctx.GlobalIsSet(MaxPendingPeersFlag.Name) {
 		cfg.MaxPendingPeers = ctx.GlobalInt(MaxPendingPeersFlag.Name)
 	}
@@ -989,6 +997,9 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 	case ctx.GlobalBool(LightModeFlag.Name):
 		cfg.SyncMode = downloader.LightSync
 	}
+	if ctx.GlobalIsSet(EthPeersFlag.Name) {
+		cfg.EthPeers = ctx.GlobalInt(EthPeersFlag.Name)
+	}
 	if ctx.GlobalIsSet(LightServFlag.Name) {
 		cfg.LightServ = ctx.GlobalInt(LightServFlag.Name)
 	}

eth/backend.go

@@ -390,16 +390,8 @@ func (s *Ethereum) Start(srvr *p2p.Server) error {
 	// Start the RPC service
 	s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.NetVersion())
 
-	// Figure out a max peers count based on the server limits
-	maxPeers := srvr.MaxPeers
-	if s.config.LightServ > 0 {
-		maxPeers -= s.config.LightPeers
-		if maxPeers < srvr.MaxPeers/2 {
-			maxPeers = srvr.MaxPeers / 2
-		}
-	}
 	// Start the networking layer and the light server if requested
-	s.protocolManager.Start(maxPeers)
+	s.protocolManager.Start(s.config.EthPeers)
 	if s.lesServer != nil {
 		s.lesServer.Start(srvr)
 	}

eth/config.go

@@ -43,7 +43,8 @@ var DefaultConfig = Config{
 		DatasetsOnDisk: 2,
 	},
 	NetworkId:     1,
-	LightPeers:    20,
+	EthPeers:      25,
+	LightPeers:    100,
 	DatabaseCache: 128,
 	GasPrice:      big.NewInt(18 * params.Shannon),
 
@@ -78,6 +79,7 @@ type Config struct {
 	// Protocol options
 	NetworkId uint64 // Network ID to use for selecting peers to connect to
 	SyncMode  downloader.SyncMode
+	EthPeers  int `toml:",omitempty"` // Maximum number of ETH peers
 
 	// Light client options
 	LightServ  int `toml:",omitempty"` // Maximum percentage of time allowed for serving LES requests

eth/gen_config.go

@@ -20,6 +20,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		Genesis                 *core.Genesis `toml:",omitempty"`
 		NetworkId               uint64
 		SyncMode                downloader.SyncMode
+		EthPeers                int  `toml:",omitempty"`
 		LightServ               int  `toml:",omitempty"`
 		LightPeers              int  `toml:",omitempty"`
 		SkipBcVersionCheck      bool `toml:"-"`
@@ -39,6 +40,7 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.Genesis = c.Genesis
 	enc.NetworkId = c.NetworkId
 	enc.SyncMode = c.SyncMode
+	enc.EthPeers = c.EthPeers
 	enc.LightServ = c.LightServ
 	enc.LightPeers = c.LightPeers
 	enc.SkipBcVersionCheck = c.SkipBcVersionCheck
@@ -61,6 +63,7 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		Genesis                 *core.Genesis `toml:",omitempty"`
 		NetworkId               *uint64
 		SyncMode                *downloader.SyncMode
+		EthPeers                *int  `toml:",omitempty"`
 		LightServ               *int  `toml:",omitempty"`
 		LightPeers              *int  `toml:",omitempty"`
 		SkipBcVersionCheck      *bool `toml:"-"`
@@ -89,6 +92,9 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.SyncMode != nil {
 		c.SyncMode = *dec.SyncMode
 	}
+	if dec.EthPeers != nil {
+		c.EthPeers = *dec.EthPeers
+	}
 	if dec.LightServ != nil {
 		c.LightServ = *dec.LightServ
 	}

les/backend.go

@@ -46,6 +46,8 @@ import (
 )
 
 type LightEthereum struct {
+	config *eth.Config
+
 	odr         *LesOdr
 	relay       *LesTxRelay
 	chainConfig *params.ChainConfig
@@ -92,6 +94,7 @@ func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
 	quitSync := make(chan struct{})
 
 	leth := &LightEthereum{
+		config:           config,
 		chainConfig:      chainConfig,
 		chainDb:          chainDb,
 		eventMux:         ctx.EventMux,
@@ -224,7 +227,7 @@ func (s *LightEthereum) Start(srvr *p2p.Server) error {
 	// clients are searching for the first advertised protocol in the list
 	protocolVersion := AdvertiseProtocolVersions[0]
 	s.serverPool.start(srvr, lesTopic(s.blockchain.Genesis().Hash(), protocolVersion))
-	s.protocolManager.Start()
+	s.protocolManager.Start(s.config.LightPeers)
 	return nil
 }
 

les/handler.go

@@ -111,6 +111,7 @@ type ProtocolManager struct {
 	downloader *downloader.Downloader
 	fetcher    *lightFetcher
 	peers      *peerSet
+	maxPeers   int
 
 	SubProtocols []p2p.Protocol
 
@@ -218,7 +219,9 @@ func (pm *ProtocolManager) removePeer(id string) {
 	pm.peers.Unregister(id)
 }
 
-func (pm *ProtocolManager) Start() {
+func (pm *ProtocolManager) Start(maxPeers int) {
+	pm.maxPeers = maxPeers
+
 	if pm.lightSync {
 		go pm.syncer()
 	} else {
@@ -259,6 +262,9 @@ func (pm *ProtocolManager) newPeer(pv int, nv uint64, p *p2p.Peer, rw p2p.MsgRea
 // handle is the callback invoked to manage the life cycle of a les peer. When
 // this function terminates, the peer is disconnected.
 func (pm *ProtocolManager) handle(p *peer) error {
+	if pm.peers.Len() >= pm.maxPeers {
+		return p2p.DiscTooManyPeers
+	}
 	p.Log().Debug("Light Ethereum peer connected", "name", p.Name())
 
 	// Execute the LES handshake

les/helper_test.go

@@ -176,7 +176,7 @@ func newTestProtocolManager(lightSync bool, blocks int, generator func(int, *cor
 		srv.fcManager = flowcontrol.NewClientManager(50, 10, 1000000000)
 		srv.fcCostStats = newCostStats(nil)
 	}
-	pm.Start()
+	pm.Start(1000)
 	return pm, nil
 }
 

les/server.go

@@ -38,6 +38,7 @@ import (
 )
 
 type LesServer struct {
+	config          *eth.Config
 	protocolManager *ProtocolManager
 	fcManager       *flowcontrol.ClientManager // nil if our node is client only
 	fcCostStats     *requestCostStats
@@ -62,6 +63,7 @@ func NewLesServer(eth *eth.Ethereum, config *eth.Config) (*LesServer, error) {
 	}
 
 	srv := &LesServer{
+		config:           config,
 		protocolManager:  pm,
 		quitSync:         quitSync,
 		lesTopics:        lesTopics,
@@ -108,7 +110,7 @@ func (s *LesServer) Protocols() []p2p.Protocol {
 
 // Start starts the LES server
 func (s *LesServer) Start(srvr *p2p.Server) {
-	s.protocolManager.Start()
+	s.protocolManager.Start(s.config.LightPeers)
 	for _, topic := range s.lesTopics {
 		topic := topic
 		go func() {

node/defaults.go

@@ -42,7 +42,7 @@ var DefaultConfig = Config{
 	WSModules:   []string{"net", "web3"},
 	P2P: p2p.Config{
 		ListenAddr: ":30303",
-		MaxPeers:   25,
+		MaxPeers:   125,
 		NAT:        nat.Any(),
 	},
 }