eth: request id dispatcher and direct req/reply APIs (#23576)

* eth: request ID based message dispatcher

* eth: fix dispatcher cancellation, rework fetchers idleness tracker

* eth/downloader: drop peers who refuse to serve advertised chains

cmd/utils/flags.go

@@ -215,7 +215,7 @@ var (
 	defaultSyncMode = ethconfig.Defaults.SyncMode
 	SyncModeFlag    = TextMarshalerFlag{
 		Name:  "syncmode",
-		Usage: `Blockchain sync mode ("fast", "full", "snap" or "light")`,
+		Usage: `Blockchain sync mode ("snap", "full" or "light")`,
 		Value: &defaultSyncMode,
 	}
 	GCModeFlag = cli.StringFlag{

core/blockchain.go

@@ -629,9 +629,9 @@ func (bc *BlockChain) setHeadBeyondRoot(head uint64, root common.Hash, repair bo
 	return rootNumber, bc.loadLastState()
 }
 
-// FastSyncCommitHead sets the current head block to the one defined by the hash
+// SnapSyncCommitHead sets the current head block to the one defined by the hash
 // irrelevant what the chain contents were prior.
-func (bc *BlockChain) FastSyncCommitHead(hash common.Hash) error {
+func (bc *BlockChain) SnapSyncCommitHead(hash common.Hash) error {
 	// Make sure that both the block as well at its state trie exists
 	block := bc.GetBlockByHash(hash)
 	if block == nil {
@@ -736,30 +736,24 @@ func (bc *BlockChain) ExportN(w io.Writer, first uint64, last uint64) error {
 //
 // Note, this function assumes that the `mu` mutex is held!
 func (bc *BlockChain) writeHeadBlock(block *types.Block) {
-	// If the block is on a side chain or an unknown one, force other heads onto it too
-	updateHeads := rawdb.ReadCanonicalHash(bc.db, block.NumberU64()) != block.Hash()
-
 	// Add the block to the canonical chain number scheme and mark as the head
 	batch := bc.db.NewBatch()
+	rawdb.WriteHeadHeaderHash(batch, block.Hash())
+	rawdb.WriteHeadFastBlockHash(batch, block.Hash())
 	rawdb.WriteCanonicalHash(batch, block.Hash(), block.NumberU64())
 	rawdb.WriteTxLookupEntriesByBlock(batch, block)
 	rawdb.WriteHeadBlockHash(batch, block.Hash())
 
-	// If the block is better than our head or is on a different chain, force update heads
-	if updateHeads {
-		rawdb.WriteHeadHeaderHash(batch, block.Hash())
-		rawdb.WriteHeadFastBlockHash(batch, block.Hash())
-	}
 	// Flush the whole batch into the disk, exit the node if failed
 	if err := batch.Write(); err != nil {
 		log.Crit("Failed to update chain indexes and markers", "err", err)
 	}
 	// Update all in-memory chain markers in the last step
-	if updateHeads {
 	bc.hc.SetCurrentHeader(block.Header())
+
 	bc.currentFastBlock.Store(block)
 	headFastBlockGauge.Update(int64(block.NumberU64()))
-	}
+
 	bc.currentBlock.Store(block)
 	headBlockGauge.Update(int64(block.NumberU64()))
 }

core/blockchain_test.go

@@ -2637,7 +2637,7 @@ func TestTransactionIndices(t *testing.T) {
 	}
 }
 
-func TestSkipStaleTxIndicesInFastSync(t *testing.T) {
+func TestSkipStaleTxIndicesInSnapSync(t *testing.T) {
 	// Configure and generate a sample block chain
 	var (
 		gendb   = rawdb.NewMemoryDatabase()

core/chain_makers.go

@@ -155,6 +155,28 @@ func (b *BlockGen) TxNonce(addr common.Address) uint64 {
 
 // AddUncle adds an uncle header to the generated block.
 func (b *BlockGen) AddUncle(h *types.Header) {
+	// The uncle will have the same timestamp and auto-generated difficulty
+	h.Time = b.header.Time
+
+	var parent *types.Header
+	for i := b.i - 1; i >= 0; i-- {
+		if b.chain[i].Hash() == h.ParentHash {
+			parent = b.chain[i].Header()
+			break
+		}
+	}
+	chainreader := &fakeChainReader{config: b.config}
+	h.Difficulty = b.engine.CalcDifficulty(chainreader, b.header.Time, parent)
+
+	// The gas limit and price should be derived from the parent
+	h.GasLimit = parent.GasLimit
+	if b.config.IsLondon(h.Number) {
+		h.BaseFee = misc.CalcBaseFee(b.config, parent)
+		if !b.config.IsLondon(parent.Number) {
+			parentGasLimit := parent.GasLimit * params.ElasticityMultiplier
+			h.GasLimit = CalcGasLimit(parentGasLimit, parentGasLimit)
+		}
+	}
 	b.uncles = append(b.uncles, h)
 }
 

core/rawdb/accessors_chain.go

@@ -242,24 +242,6 @@ func WriteLastPivotNumber(db ethdb.KeyValueWriter, pivot uint64) {
 	}
 }
 
-// ReadFastTrieProgress retrieves the number of tries nodes fast synced to allow
-// reporting correct numbers across restarts.
-func ReadFastTrieProgress(db ethdb.KeyValueReader) uint64 {
-	data, _ := db.Get(fastTrieProgressKey)
-	if len(data) == 0 {
-		return 0
-	}
-	return new(big.Int).SetBytes(data).Uint64()
-}
-
-// WriteFastTrieProgress stores the fast sync trie process counter to support
-// retrieving it across restarts.
-func WriteFastTrieProgress(db ethdb.KeyValueWriter, count uint64) {
-	if err := db.Put(fastTrieProgressKey, new(big.Int).SetUint64(count).Bytes()); err != nil {
-		log.Crit("Failed to store fast sync trie progress", "err", err)
-	}
-}
-
 // ReadTxIndexTail retrieves the number of oldest indexed block
 // whose transaction indices has been indexed. If the corresponding entry
 // is non-existent in database it means the indexing has been finished.

core/rawdb/accessors_snapshot.go

@@ -208,11 +208,3 @@ func WriteSnapshotSyncStatus(db ethdb.KeyValueWriter, status []byte) {
 		log.Crit("Failed to store snapshot sync status", "err", err)
 	}
 }
-
-// DeleteSnapshotSyncStatus deletes the serialized sync status saved at the last
-// shutdown
-func DeleteSnapshotSyncStatus(db ethdb.KeyValueWriter) {
-	if err := db.Delete(snapshotSyncStatusKey); err != nil {
-		log.Crit("Failed to remove snapshot sync status", "err", err)
-	}
-}

eth/downloader/fetchers.go

+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package downloader
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+)
+
+// fetchHeadersByHash is a blocking version of Peer.RequestHeadersByHash which
+// handles all the cancellation, interruption and timeout mechanisms of a data
+// retrieval to allow blocking API calls.
+func (d *Downloader) fetchHeadersByHash(p *peerConnection, hash common.Hash, amount int, skip int, reverse bool) ([]*types.Header, error) {
+	// Create the response sink and send the network request
+	start := time.Now()
+	resCh := make(chan *eth.Response)
+
+	req, err := p.peer.RequestHeadersByHash(hash, amount, skip, reverse, resCh)
+	if err != nil {
+		return nil, err
+	}
+	defer req.Close()
+
+	// Wait until the response arrives, the request is cancelled or times out
+	ttl := d.peers.rates.TargetTimeout()
+
+	timeoutTimer := time.NewTimer(ttl)
+	defer timeoutTimer.Stop()
+
+	select {
+	case <-d.cancelCh:
+		return nil, errCanceled
+
+	case <-timeoutTimer.C:
+		// Header retrieval timed out, update the metrics
+		p.log.Debug("Header request timed out", "elapsed", ttl)
+		headerTimeoutMeter.Mark(1)
+
+		return nil, errTimeout
+
+	case res := <-resCh:
+		// Headers successfully retrieved, update the metrics
+		headerReqTimer.Update(time.Since(start))
+		headerInMeter.Mark(int64(len(*res.Res.(*eth.BlockHeadersPacket))))
+
+		// Don't reject the packet even if it turns out to be bad, downloader will
+		// disconnect the peer on its own terms. Simply delivery the headers to
+		// be processed by the caller
+		res.Done <- nil
+
+		return *res.Res.(*eth.BlockHeadersPacket), nil
+	}
+}
+
+// fetchHeadersByNumber is a blocking version of Peer.RequestHeadersByNumber which
+// handles all the cancellation, interruption and timeout mechanisms of a data
+// retrieval to allow blocking API calls.
+func (d *Downloader) fetchHeadersByNumber(p *peerConnection, number uint64, amount int, skip int, reverse bool) ([]*types.Header, error) {
+	// Create the response sink and send the network request
+	start := time.Now()
+	resCh := make(chan *eth.Response)
+
+	req, err := p.peer.RequestHeadersByNumber(number, amount, skip, reverse, resCh)
+	if err != nil {
+		return nil, err
+	}
+	defer req.Close()
+
+	// Wait until the response arrives, the request is cancelled or times out
+	ttl := d.peers.rates.TargetTimeout()
+
+	timeoutTimer := time.NewTimer(ttl)
+	defer timeoutTimer.Stop()
+
+	select {
+	case <-d.cancelCh:
+		return nil, errCanceled
+
+	case <-timeoutTimer.C:
+		// Header retrieval timed out, update the metrics
+		p.log.Debug("Header request timed out", "elapsed", ttl)
+		headerTimeoutMeter.Mark(1)
+
+		return nil, errTimeout
+
+	case res := <-resCh:
+		// Headers successfully retrieved, update the metrics
+		headerReqTimer.Update(time.Since(start))
+		headerInMeter.Mark(int64(len(*res.Res.(*eth.BlockHeadersPacket))))
+
+		// Don't reject the packet even if it turns out to be bad, downloader will
+		// disconnect the peer on its own terms. Simply delivery the headers to
+		// be processed by the caller
+		res.Done <- nil
+
+		return *res.Res.(*eth.BlockHeadersPacket), nil
+	}
+}

eth/downloader/fetchers_concurrent_bodies.go

+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package downloader
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+// bodyQueue implements typedQueue and is a type adapter between the generic
+// concurrent fetcher and the downloader.
+type bodyQueue Downloader
+
+// waker returns a notification channel that gets pinged in case more body
+// fetches have been queued up, so the fetcher might assign it to idle peers.
+func (q *bodyQueue) waker() chan bool {
+	return q.queue.blockWakeCh
+}
+
+// pending returns the number of bodies that are currently queued for fetching
+// by the concurrent downloader.
+func (q *bodyQueue) pending() int {
+	return q.queue.PendingBodies()
+}
+
+// capacity is responsible for calculating how many bodies a particular peer is
+// estimated to be able to retrieve within the alloted round trip time.
+func (q *bodyQueue) capacity(peer *peerConnection, rtt time.Duration) int {
+	return peer.BodyCapacity(rtt)
+}
+
+// updateCapacity is responsible for updating how many bodies a particular peer
+// is estimated to be able to retrieve in a unit time.
+func (q *bodyQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
+	peer.UpdateBodyRate(items, span)
+}
+
+// reserve is responsible for allocating a requested number of pending bodies
+// from the download queue to the specified peer.
+func (q *bodyQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
+	return q.queue.ReserveBodies(peer, items)
+}
+
+// unreserve is resposible for removing the current body retrieval allocation
+// assigned to a specific peer and placing it back into the pool to allow
+// reassigning to some other peer.
+func (q *bodyQueue) unreserve(peer string) int {
+	fails := q.queue.ExpireBodies(peer)
+	if fails > 2 {
+		log.Trace("Body delivery timed out", "peer", peer)
+	} else {
+		log.Debug("Body delivery stalling", "peer", peer)
+	}
+	return fails
+}
+
+// request is responsible for converting a generic fetch request into a body
+// one and sending it to the remote peer for fulfillment.
+func (q *bodyQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
+	peer.log.Trace("Requesting new batch of bodies", "count", len(req.Headers), "from", req.Headers[0].Number)
+	if q.bodyFetchHook != nil {
+		q.bodyFetchHook(req.Headers)
+	}
+
+	hashes := make([]common.Hash, 0, len(req.Headers))
+	for _, header := range req.Headers {
+		hashes = append(hashes, header.Hash())
+	}
+	return peer.peer.RequestBodies(hashes, resCh)
+}
+
+// deliver is responsible for taking a generic response packet from the concurrent
+// fetcher, unpacking the body data and delivering it to the downloader's queue.
+func (q *bodyQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
+	txs, uncles := packet.Res.(*eth.BlockBodiesPacket).Unpack()
+
+	accepted, err := q.queue.DeliverBodies(peer.id, txs, uncles)
+	switch {
+	case err == nil && len(txs) == 0:
+		peer.log.Trace("Requested bodies delivered")
+	case err == nil:
+		peer.log.Trace("Delivered new batch of bodies", "count", len(txs), "accepted", accepted)
+	default:
+		peer.log.Debug("Failed to deliver retrieved bodies", "err", err)
+	}
+	return accepted, err
+}

eth/downloader/fetchers_concurrent_headers.go

+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package downloader
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+// headerQueue implements typedQueue and is a type adapter between the generic
+// concurrent fetcher and the downloader.
+type headerQueue Downloader
+
+// waker returns a notification channel that gets pinged in case more header
+// fetches have been queued up, so the fetcher might assign it to idle peers.
+func (q *headerQueue) waker() chan bool {
+	return q.queue.headerContCh
+}
+
+// pending returns the number of headers that are currently queued for fetching
+// by the concurrent downloader.
+func (q *headerQueue) pending() int {
+	return q.queue.PendingHeaders()
+}
+
+// capacity is responsible for calculating how many headers a particular peer is
+// estimated to be able to retrieve within the alloted round trip time.
+func (q *headerQueue) capacity(peer *peerConnection, rtt time.Duration) int {
+	return peer.HeaderCapacity(rtt)
+}
+
+// updateCapacity is responsible for updating how many headers a particular peer
+// is estimated to be able to retrieve in a unit time.
+func (q *headerQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
+	peer.UpdateHeaderRate(items, span)
+}
+
+// reserve is responsible for allocating a requested number of pending headers
+// from the download queue to the specified peer.
+func (q *headerQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
+	return q.queue.ReserveHeaders(peer, items), false, false
+}
+
+// unreserve is resposible for removing the current header retrieval allocation
+// assigned to a specific peer and placing it back into the pool to allow
+// reassigning to some other peer.
+func (q *headerQueue) unreserve(peer string) int {
+	fails := q.queue.ExpireHeaders(peer)
+	if fails > 2 {
+		log.Trace("Header delivery timed out", "peer", peer)
+	} else {
+		log.Debug("Header delivery stalling", "peer", peer)
+	}
+	return fails
+}
+
+// request is responsible for converting a generic fetch request into a header
+// one and sending it to the remote peer for fulfillment.
+func (q *headerQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
+	peer.log.Trace("Requesting new batch of headers", "from", req.From)
+	return peer.peer.RequestHeadersByNumber(req.From, MaxHeaderFetch, 0, false, resCh)
+}
+
+// deliver is responsible for taking a generic response packet from the concurrent
+// fetcher, unpacking the header data and delivering it to the downloader's queue.
+func (q *headerQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
+	headers := *packet.Res.(*eth.BlockHeadersPacket)
+
+	accepted, err := q.queue.DeliverHeaders(peer.id, headers, q.headerProcCh)
+	switch {
+	case err == nil && len(headers) == 0:
+		peer.log.Trace("Requested headers delivered")
+	case err == nil:
+		peer.log.Trace("Delivered new batch of headers", "count", len(headers), "accepted", accepted)
+	default:
+		peer.log.Debug("Failed to deliver retrieved headers", "err", err)
+	}
+	return accepted, err
+}

eth/downloader/fetchers_concurrent_receipts.go

+// Copyright 2021 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package downloader
+
+import (
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/eth/protocols/eth"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+// receiptQueue implements typedQueue and is a type adapter between the generic
+// concurrent fetcher and the downloader.
+type receiptQueue Downloader
+
+// waker returns a notification channel that gets pinged in case more reecipt
+// fetches have been queued up, so the fetcher might assign it to idle peers.
+func (q *receiptQueue) waker() chan bool {
+	return q.queue.receiptWakeCh
+}
+
+// pending returns the number of receipt that are currently queued for fetching
+// by the concurrent downloader.
+func (q *receiptQueue) pending() int {
+	return q.queue.PendingReceipts()
+}
+
+// capacity is responsible for calculating how many receipts a particular peer is
+// estimated to be able to retrieve within the alloted round trip time.
+func (q *receiptQueue) capacity(peer *peerConnection, rtt time.Duration) int {
+	return peer.ReceiptCapacity(rtt)
+}
+
+// updateCapacity is responsible for updating how many receipts a particular peer
+// is estimated to be able to retrieve in a unit time.
+func (q *receiptQueue) updateCapacity(peer *peerConnection, items int, span time.Duration) {
+	peer.UpdateReceiptRate(items, span)
+}
+
+// reserve is responsible for allocating a requested number of pending receipts
+// from the download queue to the specified peer.
+func (q *receiptQueue) reserve(peer *peerConnection, items int) (*fetchRequest, bool, bool) {
+	return q.queue.ReserveReceipts(peer, items)
+}
+
+// unreserve is resposible for removing the current receipt retrieval allocation
+// assigned to a specific peer and placing it back into the pool to allow
+// reassigning to some other peer.
+func (q *receiptQueue) unreserve(peer string) int {
+	fails := q.queue.ExpireReceipts(peer)
+	if fails > 2 {
+		log.Trace("Receipt delivery timed out", "peer", peer)
+	} else {
+		log.Debug("Receipt delivery stalling", "peer", peer)
+	}
+	return fails
+}
+
+// request is responsible for converting a generic fetch request into a receipt
+// one and sending it to the remote peer for fulfillment.
+func (q *receiptQueue) request(peer *peerConnection, req *fetchRequest, resCh chan *eth.Response) (*eth.Request, error) {
+	peer.log.Trace("Requesting new batch of receipts", "count", len(req.Headers), "from", req.Headers[0].Number)
+	if q.receiptFetchHook != nil {
+		q.receiptFetchHook(req.Headers)
+	}
+	hashes := make([]common.Hash, 0, len(req.Headers))
+	for _, header := range req.Headers {
+		hashes = append(hashes, header.Hash())
+	}
+	return peer.peer.RequestReceipts(hashes, resCh)
+}
+
+// deliver is responsible for taking a generic response packet from the concurrent
+// fetcher, unpacking the receipt data and delivering it to the downloader's queue.
+func (q *receiptQueue) deliver(peer *peerConnection, packet *eth.Response) (int, error) {
+	receipts := *packet.Res.(*eth.ReceiptsPacket)
+
+	accepted, err := q.queue.DeliverReceipts(peer.id, receipts)
+	switch {
+	case err == nil && len(receipts) == 0:
+		peer.log.Trace("Requested receipts delivered")
+	case err == nil:
+		peer.log.Trace("Delivered new batch of receipts", "count", len(receipts), "accepted", accepted)
+	default:
+		peer.log.Debug("Failed to deliver retrieved receipts", "err", err)
+	}
+	return accepted, err
+}

eth/downloader/metrics.go

@@ -38,8 +38,5 @@ var (
 	receiptDropMeter    = metrics.NewRegisteredMeter("eth/downloader/receipts/drop", nil)
 	receiptTimeoutMeter = metrics.NewRegisteredMeter("eth/downloader/receipts/timeout", nil)
 
-	stateInMeter   = metrics.NewRegisteredMeter("eth/downloader/states/in", nil)
-	stateDropMeter = metrics.NewRegisteredMeter("eth/downloader/states/drop", nil)
-
 	throttleCounter = metrics.NewRegisteredCounter("eth/downloader/throttle", nil)
 )

eth/downloader/modes.go

@@ -24,7 +24,6 @@ type SyncMode uint32
 
 const (
 	FullSync  SyncMode = iota // Synchronise the entire blockchain history from full blocks
-	FastSync                  // Quickly download the headers, full sync only at the chain
 	SnapSync                  // Download the chain and the state via compact snapshots
 	LightSync                 // Download only the headers and terminate afterwards
 )
@@ -38,8 +37,6 @@ func (mode SyncMode) String() string {
 	switch mode {
 	case FullSync:
 		return "full"
-	case FastSync:
-		return "fast"
 	case SnapSync:
 		return "snap"
 	case LightSync:
@@ -53,8 +50,6 @@ func (mode SyncMode) MarshalText() ([]byte, error) {
 	switch mode {
 	case FullSync:
 		return []byte("full"), nil
-	case FastSync:
-		return []byte("fast"), nil
 	case SnapSync:
 		return []byte("snap"), nil
 	case LightSync:
@@ -68,14 +63,12 @@ func (mode *SyncMode) UnmarshalText(text []byte) error {
 	switch string(text) {
 	case "full":
 		*mode = FullSync
-	case "fast":
-		*mode = FastSync
 	case "snap":
 		*mode = SnapSync
 	case "light":
 		*mode = LightSync
 	default:
-		return fmt.Errorf(`unknown sync mode %q, want "full", "fast" or "light"`, text)
+		return fmt.Errorf(`unknown sync mode %q, want "full", "snap" or "light"`, text)
 	}
 	return nil
 }

eth/downloader/queue_test.go

@@ -104,7 +104,7 @@ func TestBasics(t *testing.T) {
 	if !q.Idle() {
 		t.Errorf("new queue should be idle")
 	}
-	q.Prepare(1, FastSync)
+	q.Prepare(1, SnapSync)
 	if res := q.Results(false); len(res) != 0 {
 		t.Fatal("new queue should have 0 results")
 	}
@@ -114,7 +114,7 @@ func TestBasics(t *testing.T) {
 	if q.Idle() {
 		t.Errorf("queue should not be idle")
 	}
-	if got, exp := q.PendingBlocks(), chain.Len(); got != exp {
+	if got, exp := q.PendingBodies(), chain.Len(); got != exp {
 		t.Errorf("wrong pending block count, got %d, exp %d", got, exp)
 	}
 	// Only non-empty receipts get added to task-queue
@@ -197,13 +197,13 @@ func TestEmptyBlocks(t *testing.T) {
 
 	q := newQueue(10, 10)
 
-	q.Prepare(1, FastSync)
+	q.Prepare(1, SnapSync)
 	// Schedule a batch of headers
 	q.Schedule(emptyChain.headers(), 1)
 	if q.Idle() {
 		t.Errorf("queue should not be idle")
 	}
-	if got, exp := q.PendingBlocks(), len(emptyChain.blocks); got != exp {
+	if got, exp := q.PendingBodies(), len(emptyChain.blocks); got != exp {
 		t.Errorf("wrong pending block count, got %d, exp %d", got, exp)
 	}
 	if got, exp := q.PendingReceipts(), 0; got != exp {
@@ -272,7 +272,7 @@ func XTestDelivery(t *testing.T) {
 	}
 	q := newQueue(10, 10)
 	var wg sync.WaitGroup
-	q.Prepare(1, FastSync)
+	q.Prepare(1, SnapSync)
 	wg.Add(1)
 	go func() {
 		// deliver headers

eth/downloader/types.go

-// Copyright 2015 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package downloader
-
-import (
-	"fmt"
-
-	"github.com/ethereum/go-ethereum/core/types"
-)
-
-// peerDropFn is a callback type for dropping a peer detected as malicious.
-type peerDropFn func(id string)
-
-// dataPack is a data message returned by a peer for some query.
-type dataPack interface {
-	PeerId() string
-	Items() int
-	Stats() string
-}
-
-// headerPack is a batch of block headers returned by a peer.
-type headerPack struct {
-	peerID  string
-	headers []*types.Header
-}
-
-func (p *headerPack) PeerId() string { return p.peerID }
-func (p *headerPack) Items() int     { return len(p.headers) }
-func (p *headerPack) Stats() string  { return fmt.Sprintf("%d", len(p.headers)) }
-
-// bodyPack is a batch of block bodies returned by a peer.
-type bodyPack struct {
-	peerID       string
-	transactions [][]*types.Transaction
-	uncles       [][]*types.Header
-}
-
-func (p *bodyPack) PeerId() string { return p.peerID }
-func (p *bodyPack) Items() int {
-	if len(p.transactions) <= len(p.uncles) {
-		return len(p.transactions)
-	}
-	return len(p.uncles)
-}
-func (p *bodyPack) Stats() string { return fmt.Sprintf("%d:%d", len(p.transactions), len(p.uncles)) }
-
-// receiptPack is a batch of receipts returned by a peer.
-type receiptPack struct {
-	peerID   string
-	receipts [][]*types.Receipt
-}
-
-func (p *receiptPack) PeerId() string { return p.peerID }
-func (p *receiptPack) Items() int     { return len(p.receipts) }
-func (p *receiptPack) Stats() string  { return fmt.Sprintf("%d", len(p.receipts)) }
-
-// statePack is a batch of states returned by a peer.
-type statePack struct {
-	peerID string
-	states [][]byte
-}
-
-func (p *statePack) PeerId() string { return p.peerID }
-func (p *statePack) Items() int     { return len(p.states) }
-func (p *statePack) Stats() string  { return fmt.Sprintf("%d", len(p.states)) }

eth/handler_test.go

@@ -152,7 +152,7 @@ func newTestHandlerWithBlocks(blocks int) *testHandler {
 		TxPool:     txpool,
 		Merger:     consensus.NewMerger(rawdb.NewMemoryDatabase()),
 		Network:    1,
-		Sync:       downloader.FastSync,
+		Sync:       downloader.SnapSync,
 		BloomCache: 1,
 	})
 	handler.Start(1000)

eth/peer.go

@@ -18,8 +18,6 @@ package eth
 
 import (
 	"math/big"
-	"sync"
-	"time"
 
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
 	"github.com/ethereum/go-ethereum/eth/protocols/snap"
@@ -37,10 +35,7 @@ type ethPeerInfo struct {
 type ethPeer struct {
 	*eth.Peer
 	snapExt  *snapPeer     // Satellite `snap` connection
-
-	syncDrop *time.Timer   // Connection dropper if `eth` sync progress isn't validated in time
 	snapWait chan struct{} // Notification channel for snap connections
-	lock     sync.RWMutex  // Mutex protecting the internal fields
 }
 
 // info gathers and returns some `eth` protocol metadata known about a peer.

eth/protocols/snap/peer.go

@@ -33,9 +33,9 @@ type Peer struct {
 	logger log.Logger // Contextual logger with the peer id injected
 }
 
-// newPeer create a wrapper for a network connection and negotiated  protocol
+// NewPeer create a wrapper for a network connection and negotiated  protocol
 // version.
-func newPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) *Peer {
+func NewPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) *Peer {
 	id := p.ID().String()
 	return &Peer{
 		id:      id,