eth,node: remove the remaining eventMux and event type

eth/backend.go

@@ -49,7 +49,6 @@ import (
 	"github.com/ethereum/go-ethereum/eth/protocols/snap"
 	"github.com/ethereum/go-ethereum/eth/tracers"
 	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
 	"github.com/ethereum/go-ethereum/internal/shutdowncheck"
 	"github.com/ethereum/go-ethereum/internal/version"
@@ -105,7 +104,6 @@ type Ethereum struct {
 	// DB interfaces
 	chainDb ethdb.Database // Block chain database
 
-	eventMux       *event.TypeMux
 	engine         consensus.Engine
 	accountManager *accounts.Manager
 
@@ -194,7 +192,6 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 	eth := &Ethereum{
 		config:          config,
 		chainDb:         chainDb,
-		eventMux:        stack.EventMux(),
 		accountManager:  stack.AccountManager(),
 		engine:          engine,
 		networkID:       networkID,
@@ -343,7 +340,6 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		Network:        networkID,
 		Sync:           config.SyncMode,
 		BloomCache:     uint64(cacheLimit),
-		EventMux:       eth.eventMux,
 		RequiredBlocks: config.RequiredBlocks,
 	}); err != nil {
 		return nil, err
@@ -599,7 +595,6 @@ func (s *Ethereum) Stop() error {
 	s.shutdownTracker.Stop()
 
 	s.chainDb.Close()
-	s.eventMux.Stop()
 
 	return nil
 }

eth/downloader/downloader.go

@@ -97,11 +97,10 @@ type headerTask struct {
 }
 
 type Downloader struct {
-	mode  atomic.Uint32  // Synchronisation mode defining the strategy used (per sync cycle), use d.getMode() to get the SyncMode
-	moder *syncModer     // Sync mode management, deliver the appropriate sync mode choice for each cycle
-	mux   *event.TypeMux // Event multiplexer to announce sync operation events
+	mode  atomic.Uint32 // Synchronisation mode defining the strategy used (per sync cycle), use d.getMode() to get the SyncMode
+	moder *syncModer    // Sync mode management, deliver the appropriate sync mode choice for each cycle
 
-	// New event feed for downloader events (alongside the existing TypeMux)
+	// Event feed for downloader events
 	feed  event.FeedOf[SyncEvent]
 	scope event.SubscriptionScope
 
@@ -233,12 +232,11 @@ type BlockChain interface {
 }
 
 // New creates a new downloader to fetch hashes and blocks from remote peers.
-func New(stateDb ethdb.Database, mode ethconfig.SyncMode, mux *event.TypeMux, chain BlockChain, dropPeer peerDropFn, success func()) *Downloader {
+func New(stateDb ethdb.Database, chain BlockChain, mode ethconfig.SyncMode, dropPeer peerDropFn, success func()) *Downloader {
 	cutoffNumber, cutoffHash := chain.HistoryPruningCutoff()
 	dl := &Downloader{
 		stateDB:           stateDb,
 		moder:             newSyncModer(mode, chain, stateDb),
-		mux:               mux,
 		queue:             newQueue(blockCacheMaxItems, blockCacheInitialItems),
 		peers:             newPeerSet(),
 		blockchain:        chain,
@@ -439,16 +437,13 @@ func (d *Downloader) SubscribeSyncEvents(ch chan<- SyncEvent) event.Subscription
 // syncToHead starts a block synchronization based on the hash chain from
 // the specified head hash.
 func (d *Downloader) syncToHead() (err error) {
-	d.mux.Post(StartEvent{})
 	d.feed.Send(SyncEvent{Type: SyncStarted})
 	defer func() {
 		// reset on error
 		if err != nil {
-			d.mux.Post(FailedEvent{err})
 			d.feed.Send(SyncEvent{Type: SyncFailed, Err: err})
 		} else {
 			latest := d.blockchain.CurrentHeader()
-			d.mux.Post(DoneEvent{latest})
 			d.feed.Send(SyncEvent{Type: SyncCompleted, Latest: latest})
 		}
 	}()

eth/downloader/downloader_test.go

@@ -32,7 +32,6 @@ import (
 	"github.com/ethereum/go-ethereum/eth/ethconfig"
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
 	"github.com/ethereum/go-ethereum/eth/protocols/snap"
-	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
@@ -75,7 +74,7 @@ func newTesterWithNotification(t *testing.T, mode ethconfig.SyncMode, success fu
 		chain: chain,
 		peers: make(map[string]*downloadTesterPeer),
 	}
-	tester.downloader = New(db, mode, new(event.TypeMux), tester.chain, tester.dropPeer, success)
+	tester.downloader = New(db, tester.chain, mode, tester.dropPeer, success)
 	return tester
 }
 

eth/downloader/events.go

@@ -18,12 +18,6 @@ package downloader
 
 import "github.com/ethereum/go-ethereum/core/types"
 
-type DoneEvent struct {
-	Latest *types.Header
-}
-type StartEvent struct{}
-type FailedEvent struct{ Err error }
-
 // SyncEventType represents the type of sync event
 type SyncEventType int
 

eth/handler.go

@@ -107,7 +107,6 @@ type handlerConfig struct {
 	Network        uint64                 // Network identifier to advertise
 	Sync           ethconfig.SyncMode     // Whether to snap or full sync
 	BloomCache     uint64                 // Megabytes to alloc for snap sync bloom
-	EventMux       *event.TypeMux         // Legacy event mux, deprecate for `feed`
 	RequiredBlocks map[uint64]common.Hash // Hard coded map of required block hashes for sync challenges
 }
 
@@ -126,7 +125,6 @@ type handler struct {
 	peers          *peerSet
 	txBroadcastKey [16]byte
 
-	eventMux   *event.TypeMux
 	txsCh      chan core.NewTxsEvent
 	txsSub     event.Subscription
 	blockRange *blockRangeState
@@ -144,14 +142,9 @@ type handler struct {
 
 // newHandler returns a handler for all Ethereum chain management protocol.
 func newHandler(config *handlerConfig) (*handler, error) {
-	// Create the protocol manager with the base fields
-	if config.EventMux == nil {
-		config.EventMux = new(event.TypeMux) // Nicety initialization for tests
-	}
 	h := &handler{
 		nodeID:         config.NodeID,
 		networkID:      config.Network,
-		eventMux:       config.EventMux,
 		database:       config.Database,
 		txpool:         config.TxPool,
 		chain:          config.Chain,
@@ -163,7 +156,7 @@ func newHandler(config *handlerConfig) (*handler, error) {
 		handlerStartCh: make(chan struct{}),
 	}
 	// Construct the downloader (long sync)
-	h.downloader = downloader.New(config.Database, config.Sync, h.eventMux, h.chain, h.removePeer, h.enableSyncedFeatures)
+	h.downloader = downloader.New(config.Database, h.chain, config.Sync, h.removePeer, h.enableSyncedFeatures)
 
 	// If snap sync is requested but snapshots are disabled, fail loudly
 	if h.downloader.ConfigSyncMode() == ethconfig.SnapSync && (config.Chain.Snapshots() == nil && config.Chain.TrieDB().Scheme() == rawdb.HashScheme) {
@@ -420,7 +413,7 @@ func (h *handler) Start(maxPeers int) {
 
 	// broadcast block range
 	h.wg.Add(1)
-	h.blockRange = newBlockRangeState(h.chain, h.eventMux)
+	h.blockRange = newBlockRangeState(h.chain, h.downloader)
 	go h.blockRangeLoop(h.blockRange)
 
 	// start sync handlers
@@ -536,16 +529,19 @@ type blockRangeState struct {
 	next    atomic.Pointer[eth.BlockRangeUpdatePacket]
 	headCh  chan core.ChainHeadEvent
 	headSub event.Subscription
-	syncSub *event.TypeMuxSubscription
+	syncCh  chan downloader.SyncEvent
+	syncSub event.Subscription
 }
 
-func newBlockRangeState(chain *core.BlockChain, typeMux *event.TypeMux) *blockRangeState {
+func newBlockRangeState(chain *core.BlockChain, dl *downloader.Downloader) *blockRangeState {
 	headCh := make(chan core.ChainHeadEvent, chainHeadChanSize)
 	headSub := chain.SubscribeChainHeadEvent(headCh)
-	syncSub := typeMux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
+	syncCh := make(chan downloader.SyncEvent, 16)
+	syncSub := dl.SubscribeSyncEvents(syncCh)
 	st := &blockRangeState{
 		headCh:  headCh,
 		headSub: headSub,
+		syncCh:  syncCh,
 		syncSub: syncSub,
 	}
 	st.update(chain, chain.CurrentBlock())
@@ -561,11 +557,8 @@ func (h *handler) blockRangeLoop(st *blockRangeState) {
 
 	for {
 		select {
-		case ev := <-st.syncSub.Chan():
-			if ev == nil {
-				continue
-			}
-			if _, ok := ev.Data.(downloader.StartEvent); ok && h.downloader.ConfigSyncMode() == ethconfig.SnapSync {
+		case ev := <-st.syncCh:
+			if ev.Type == downloader.SyncStarted && h.downloader.ConfigSyncMode() == ethconfig.SnapSync {
 				h.blockRangeWhileSnapSyncing(st)
 			}
 		case <-st.headCh:
@@ -593,12 +586,8 @@ func (h *handler) blockRangeWhileSnapSyncing(st *blockRangeState) {
 				h.broadcastBlockRange(st)
 			}
 		// back to processing head block updates when sync is done
-		case ev := <-st.syncSub.Chan():
-			if ev == nil {
-				continue
-			}
-			switch ev.Data.(type) {
-			case downloader.FailedEvent, downloader.DoneEvent:
+		case ev := <-st.syncCh:
+			if ev.Type == downloader.SyncFailed || ev.Type == downloader.SyncCompleted {
 				return
 			}
 		// ignore head updates, but exit when the subscription ends

node/node.go

@@ -35,7 +35,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/rawdb"
 	"github.com/ethereum/go-ethereum/ethdb"
 	"github.com/ethereum/go-ethereum/ethdb/memorydb"
-	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p"
 	"github.com/ethereum/go-ethereum/rpc"
@@ -44,7 +43,6 @@ import (
 
 // Node is a container on which services can be registered.
 type Node struct {
-	eventmux      *event.TypeMux
 	config        *Config
 	accman        *accounts.Manager
 	log           log.Logger
@@ -108,7 +106,6 @@ func New(conf *Config) (*Node, error) {
 	node := &Node{
 		config:        conf,
 		inprocHandler: server,
-		eventmux:      new(event.TypeMux),
 		log:           conf.Logger,
 		stop:          make(chan struct{}),
 		server:        &p2p.Server{Config: conf.P2P},
@@ -692,12 +689,6 @@ func (n *Node) WSAuthEndpoint() string {
 	return "ws://" + n.wsAuth.listenAddr() + n.wsAuth.wsConfig.prefix
 }
 
-// EventMux retrieves the event multiplexer used by all the network services in
-// the current protocol stack.
-func (n *Node) EventMux() *event.TypeMux {
-	return n.eventmux
-}
-
 // OpenDatabaseWithOptions opens an existing database with the given name (or creates one if no
 // previous can be found) from within the node's instance directory. If the node has no
 // data directory, an in-memory database is returned.