Add block relaying functionality to improve node reputation and peer connectivity

global/global.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/rs/zerolog/log"
@@ -25,8 +26,11 @@ var (
 	hasBeenCalledConfig bool
 
 	// --- Block Tracker State ---
-	latestBlockData CachedBlock
-	blockMu         sync.RWMutex
+	latestBlockData  CachedBlock
+	latestFullBlock  *types.Block
+	blockMu          sync.RWMutex
+	blockCallbacksMu sync.RWMutex
+	blockCallbacks   []func(*types.Block)
 )
 
 // CachedBlock holds the minimal data you need for Status messages
@@ -43,6 +47,41 @@ func GetLatestBlock() CachedBlock {
 	return latestBlockData
 }
 
+// GetLatestFullBlock returns the full block data if available.
+func GetLatestFullBlock() *types.Block {
+	blockMu.RLock()
+	defer blockMu.RUnlock()
+	return latestFullBlock
+}
+
+// RegisterBlockCallback registers a function to be called when a new block arrives.
+func RegisterBlockCallback(callback func(*types.Block)) {
+	blockCallbacksMu.Lock()
+	defer blockCallbacksMu.Unlock()
+	blockCallbacks = append(blockCallbacks, callback)
+}
+
+// notifyBlockCallbacks calls all registered callbacks with the new block.
+func notifyBlockCallbacks(block *types.Block) {
+	blockCallbacksMu.RLock()
+	callbacks := make([]func(*types.Block), len(blockCallbacks))
+	copy(callbacks, blockCallbacks)
+	blockCallbacksMu.RUnlock()
+
+	// Use goroutines with panic recovery to prevent callback failures from affecting the system
+	for _, callback := range callbacks {
+		cb := callback // capture loop variable
+		go func() {
+			defer func() {
+				if r := recover(); r != nil {
+					log.Error().Interface("panic", r).Msg("Block callback panicked")
+				}
+			}()
+			cb(block)
+		}()
+	}
+}
+
 // StartBlockListener connects to Alchemy via WebSocket and updates the
 // latestBlockData variable in the background automatically.
 func StartBlockListener(wsURL string) {
@@ -83,8 +122,10 @@ func runListener(wsURL string) {
 		case header := <-headers:
 			// Parse the raw JSON-RPC result
 			if hashStr, ok := header["hash"].(string); ok {
+				blockHash := common.HexToHash(hashStr)
+
 				blockMu.Lock()
-				latestBlockData.Hash = common.HexToHash(hashStr)
+				latestBlockData.Hash = blockHash
 
 				// Handle Block Number (can be hex string)
 				if numStr, ok := header["number"].(string); ok {
@@ -98,6 +139,30 @@ func runListener(wsURL string) {
 				}
 				blockMu.Unlock()
 
+				// Fetch full block data in background
+				go func(hash common.Hash) {
+					var fullBlock *types.Block
+					err := client.CallContext(ctx, &fullBlock, "eth_getBlockByHash", hash.Hex(), true)
+					if err != nil {
+						log.Warn().Err(err).Str("hash", hash.Hex()).Msg("Failed to fetch full block data")
+						return
+					}
+
+					if fullBlock == nil {
+						log.Warn().Str("hash", hash.Hex()).Msg("Received nil block from RPC")
+						return
+					}
+
+					blockMu.Lock()
+					latestFullBlock = fullBlock
+					blockMu.Unlock()
+
+					// Notify all registered callbacks
+					notifyBlockCallbacks(fullBlock)
+
+					log.Debug().Str("hash", hash.Hex()).Uint64("number", fullBlock.NumberU64()).Msg("Updated full block cache")
+				}(blockHash)
+
 				// Optional: Debug log
 				// log.Debug().Str("hash", hashStr).Msg("Updated latest block cache")
 			}

go.sum

@@ -1,36 +1,18 @@
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@@ -49,39 +31,19 @@ github.com/ethereum/go-ethereum v1.14.12 h1:8hl57x77HSUo+cXExrURjU/w1VhL+ShCTJrT
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 github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible h1:Bn1aCHHRnjv4Bl16T8rcaFjYSrGrIZvpiGO6P3Q4GpU=
 github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/supranational/blst v0.3.13 h1:AYeSxdOMacwu7FBmpfloBz5pbFXDmJL33RuwnKtmTjk=
 github.com/supranational/blst v0.3.13/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
-github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 h1:epCh84lMvA70Z7CTTCmYQn2CKbY8j86K7/FAIr141uY=
-github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7/go.mod h1:q4W45IWZaF22tdD+VEXcAWRA037jwmWEB5VWYORlTpc=
 github.com/tklauser/go-sysconf v0.3.12 h1:0QaGUFOdQaIVdPgfITYzaTegZvdCjmYO52cSFAEVmqU=
 github.com/tklauser/go-sysconf v0.3.12/go.mod h1:Ho14jnntGE1fpdOqQEEaiKRpvIavV0hSfmBq8nJbHYI=
 github.com/tklauser/numcpus v0.6.1 h1:ng9scYS7az0Bk4OZLvrNXNSAO2Pxr1XXRAPyjhIx+Fk=
 github.com/tklauser/numcpus v0.6.1/go.mod h1:1XfjsgE2zo8GVw7POkMbHENHzVg3GzmoZ9fESEdAacY=
-github.com/urfave/cli/v2 v2.25.7 h1:VAzn5oq403l5pHjc4OhD54+XGO9cdKVL/7lDjF+iKUs=
-github.com/urfave/cli/v2 v2.25.7/go.mod h1:8qnjx1vcq5s2/wpsqoZFndg2CE5tNFyrTvS6SinrnYQ=
-github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
-github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
 golang.org/x/crypto v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
 golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
 golang.org/x/exp v0.0.0-20231110203233-9a3e6036ecaa h1:FRnLl4eNAQl8hwxVVC17teOw8kdjVDVAiFMtgUdTSRQ=
@@ -165,17 +102,9 @@ golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
 golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.21.0 h1:zyQAAkrwaneQ066sspRyJaG9VNi/YJ1NfzcGB3hZ/qo=
-golang.org/x/text v0.21.0/go.mod h1:4IBbMaMmOPCJ8SecivzSH54+73PCFmPWxNTLm+vZkEQ=
-golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
-golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
-google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
-google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
-gopkg.in/natefinch/lumberjack.v2 v2.2.1 h1:bBRl1b0OH9s/DuPhuXpNl+VtCaJXFZ5/uEFST95x9zc=
-gopkg.in/natefinch/lumberjack.v2 v2.2.1/go.mod h1:YD8tP3GAjkrDg1eZH7EGmyESg/lsYskCTPBJVb9jqSc=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

main.go

@@ -7,12 +7,14 @@ import (
 	"eth_discover/node"
 	"flag"
 	"fmt"
+	"math/big"
 	_ "net/http/pprof"
 	"os"
 	"os/signal"
 	"syscall"
 	"time"
 
+	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/rs/zerolog/log"
 )
@@ -57,6 +59,17 @@ func main() {
 
 	G.StartBlockListener("wss://eth-mainnet.g.alchemy.com/v2/hNDILvs5J8QZTv8t9KJx_LK_AE7hgFR6")
 
+	// Register block relay callback to relay blocks from Alchemy to peers
+	G.RegisterBlockCallback(func(block *types.Block) {
+		// Use block's difficulty if available, otherwise use a small non-zero value
+		// Post-merge, difficulty is typically 0, but we use a small value to signal validity
+		td := block.Difficulty()
+		if td == nil || td.Cmp(big.NewInt(0)) == 0 {
+			td = big.NewInt(1) // Minimal non-zero value for post-merge blocks
+		}
+		transport_node.RelayBlockToPeers(block, td)
+	})
+
 	go func() {
 		// some ugly code to get pending transactions from alchemy, in order to attempt to become a better node
 		transport_node.GetAndSendPendingTransactionFromAlchemy(ctx)

node/transport/callbacks.go

@@ -141,6 +141,10 @@ func (tn *TransportNode) ExecFrame(m rlpx.Packet, session *session.Session) {
 		// panic("3")
 	case *rlpx.NewBlock:
 		log.Info().Str("component", "eth").Msgf("received newBlock frame %v", frame.String())
+
+		// Relay the block to other peers (good network citizenship)
+		newBlock := f.(*rlpx.NewBlock)
+		tn.RelayBlockToPeers(newBlock.Block, newBlock.TD)
 	case *rlpx.NewPooledTransactionHashes:
 		log.Info().Str("component", "eth").Msgf("received newPooledTransactionHashes frame %v", frame.String())
 

node/transport/transport.go

@@ -123,6 +123,40 @@ func (tn *TransportNode) Disconnect(session *session.Session, reason uint64) {
 
 	tn.tcp.Close(session)
 }
+
+// RelayBlockToPeers sends a NewBlock message to all bonded peers.
+func (tn *TransportNode) RelayBlockToPeers(block *types.Block, td *big.Int) {
+	if block == nil {
+		return
+	}
+
+	sessions := tn.sessionManager.GetAllSessions()
+	relayCount := 0
+
+	for _, session := range sessions {
+		if !session.IsBonded() {
+			continue
+		}
+
+		newBlockMsg, err := rlpx.CreateNewBlock(session, block, td)
+		if err != nil {
+			log.Err(err).Str("component", "eth").Msg("error creating NewBlock message")
+			continue
+		}
+
+		tn.SendTCP(session, newBlockMsg)
+		relayCount++
+	}
+
+	if relayCount > 0 {
+		log.Info().Str("component", "eth").
+			Uint64("block_number", block.NumberU64()).
+			Str("block_hash", block.Hash().Hex()).
+			Int("peers", relayCount).
+			Msg("Relayed block to peers")
+	}
+}
+
 func (tn *TransportNode) GetAndSendPendingTransactionFromAlchemy(ctx context.Context) {
 	wsURL := "wss://eth-mainnet.g.alchemy.com/v2/hNDILvs5J8QZTv8t9KJx_LK_AE7hgFR6"