From f7ca03ae875c7c78191bf38f6ce1cc4bbe5361c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Thu, 28 Dec 2017 15:18:34 +0200
Subject: [PATCH] eth, les, light: expose chain config in les node info too
 (#15732)

---
 eth/handler.go       | 12 ++++++------
 ethstats/ethstats.go |  4 ++--
 les/handler.go       | 17 ++++++++++++++---
 light/lightchain.go  |  3 +++
 4 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/eth/handler.go b/eth/handler.go
index cd66662d8..31c311687 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -744,10 +744,10 @@ func (self *ProtocolManager) txBroadcastLoop() {
 	}
 }
 
-// EthNodeInfo represents a short summary of the Ethereum sub-protocol metadata known
-// about the host peer.
-type EthNodeInfo struct {
-	Network    uint64              `json:"network"`    // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3)
+// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
+// known about the host peer.
+type NodeInfo struct {
+	Network    uint64              `json:"network"`    // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
 	Difficulty *big.Int            `json:"difficulty"` // Total difficulty of the host's blockchain
 	Genesis    common.Hash         `json:"genesis"`    // SHA3 hash of the host's genesis block
 	Config     *params.ChainConfig `json:"config"`     // Chain configuration for the fork rules
@@ -755,9 +755,9 @@ type EthNodeInfo struct {
 }
 
 // NodeInfo retrieves some protocol metadata about the running host node.
-func (self *ProtocolManager) NodeInfo() *EthNodeInfo {
+func (self *ProtocolManager) NodeInfo() *NodeInfo {
 	currentBlock := self.blockchain.CurrentBlock()
-	return &EthNodeInfo{
+	return &NodeInfo{
 		Network:    self.networkId,
 		Difficulty: self.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64()),
 		Genesis:    self.blockchain.Genesis().Hash(),
diff --git a/ethstats/ethstats.go b/ethstats/ethstats.go
index 7065d7162..1e27a1e63 100644
--- a/ethstats/ethstats.go
+++ b/ethstats/ethstats.go
@@ -374,10 +374,10 @@ func (s *Service) login(conn *websocket.Conn) error {
 
 	var network, protocol string
 	if info := infos.Protocols["eth"]; info != nil {
-		network = fmt.Sprintf("%d", info.(*eth.EthNodeInfo).Network)
+		network = fmt.Sprintf("%d", info.(*eth.NodeInfo).Network)
 		protocol = fmt.Sprintf("eth/%d", eth.ProtocolVersions[0])
 	} else {
-		network = fmt.Sprintf("%d", infos.Protocols["les"].(*eth.EthNodeInfo).Network)
+		network = fmt.Sprintf("%d", infos.Protocols["les"].(*les.NodeInfo).Network)
 		protocol = fmt.Sprintf("les/%d", les.ClientProtocolVersions[0])
 	}
 	auth := &authMsg{
diff --git a/les/handler.go b/les/handler.go
index 613fbb79f..f8cf63952 100644
--- a/les/handler.go
+++ b/les/handler.go
@@ -32,7 +32,6 @@ import (
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/eth/downloader"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/event"
@@ -73,6 +72,7 @@ func errResp(code errCode, format string, v ...interface{}) error {
 }
 
 type BlockChain interface {
+	Config() *params.ChainConfig
 	HasHeader(hash common.Hash, number uint64) bool
 	GetHeader(hash common.Hash, number uint64) *types.Header
 	GetHeaderByHash(hash common.Hash) *types.Header
@@ -1123,12 +1123,23 @@ func (pm *ProtocolManager) txStatus(hashes []common.Hash) []txStatus {
 	return stats
 }
 
+// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
+// known about the host peer.
+type NodeInfo struct {
+	Network    uint64              `json:"network"`    // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
+	Difficulty *big.Int            `json:"difficulty"` // Total difficulty of the host's blockchain
+	Genesis    common.Hash         `json:"genesis"`    // SHA3 hash of the host's genesis block
+	Config     *params.ChainConfig `json:"config"`     // Chain configuration for the fork rules
+	Head       common.Hash         `json:"head"`       // SHA3 hash of the host's best owned block
+}
+
 // NodeInfo retrieves some protocol metadata about the running host node.
-func (self *ProtocolManager) NodeInfo() *eth.EthNodeInfo {
-	return &eth.EthNodeInfo{
+func (self *ProtocolManager) NodeInfo() *NodeInfo {
+	return &NodeInfo{
 		Network:    self.networkId,
 		Difficulty: self.blockchain.GetTdByHash(self.blockchain.LastBlockHash()),
 		Genesis:    self.blockchain.Genesis().Hash(),
+		Config:     self.blockchain.Config(),
 		Head:       self.blockchain.LastBlockHash(),
 	}
 }
diff --git a/light/lightchain.go b/light/lightchain.go
index 30baeaccb..c5c2dcf46 100644
--- a/light/lightchain.go
+++ b/light/lightchain.go
@@ -457,6 +457,9 @@ func (self *LightChain) GetHeaderByNumberOdr(ctx context.Context, number uint64)
 	return GetHeaderByNumber(ctx, self.odr, number)
 }
 
+// Config retrieves the header chain's chain configuration.
+func (self *LightChain) Config() *params.ChainConfig { return self.hc.Config() }
+
 func (self *LightChain) SyncCht(ctx context.Context) bool {
 	if self.odr.ChtIndexer() == nil {
 		return false