eth/downloader: remove eth62 (#21378)

* init

notes

removed some mentions of eth62, bumped protocol err too old to >=63

* remove sanity checks and bump supported protocol version up to 63

* remove 62 tests, still need to add 65

* remove 65 tests
# Conflicts:
#	eth/downloader/downloader_test.go
#	eth/downloader/peer.go

eth/downloader/downloader.go

@@ -95,7 +95,7 @@ var (
 	errCancelContentProcessing = errors.New("content processing canceled (requested)")
 	errCanceled                = errors.New("syncing canceled (requested)")
 	errNoSyncActive            = errors.New("no sync active")
-	errTooOld                  = errors.New("peer doesn't speak recent enough protocol version (need version >= 62)")
+	errTooOld                  = errors.New("peer doesn't speak recent enough protocol version (need version >= 63)")
 )
 
 type Downloader struct {
@@ -464,7 +464,7 @@ func (d *Downloader) syncWithPeer(p *peerConnection, hash common.Hash, blockNumb
 			d.mux.Post(DoneEvent{latest})
 		}
 	}()
-	if p.version < 62 {
+	if p.version < 63 {
 		return errTooOld
 	}
 	mode := d.getMode()

eth/downloader/downloader_test.go

@@ -809,7 +809,6 @@ func testMultiProtoSync(t *testing.T, protocol int, mode SyncMode) {
 	chain := testChainBase.shorten(blockCacheItems - 15)
 
 	// Create peers of every type
-	require.NoError(tester.newPeer("peer 62", 62, chain))
 	require.NoError(tester.newPeer("peer 63", 63, chain))
 	require.NoError(tester.newPeer("peer 64", 64, chain))
 	require.NoError(tester.newPeer("peer 65", 65, chain))
@@ -821,7 +820,7 @@ func testMultiProtoSync(t *testing.T, protocol int, mode SyncMode) {
 	assertOwnChain(t, tester, chain.len())
 
 	// Check that no peers have been dropped off
-	for _, version := range []int{62, 63, 64, 65} {
+	for _, version := range []int{63, 64} {
 		peer := fmt.Sprintf("peer %d", version)
 		if _, ok := tester.peers[peer]; !ok {
 			t.Errorf("%s dropped", peer)

eth/downloader/peer.go

@@ -21,7 +21,6 @@ package downloader
 
 import (
 	"errors"
-	"fmt"
 	"math"
 	"sort"
 	"sync"
@@ -106,6 +105,9 @@ func (w *lightPeerWrapper) RequestBodies([]common.Hash) error {
 func (w *lightPeerWrapper) RequestReceipts([]common.Hash) error {
 	panic("RequestReceipts not supported in light client mode sync")
 }
+func (w *lightPeerWrapper) RequestNodeData([]common.Hash) error {
+	panic("RequestNodeData not supported in light client mode sync")
+}
 
 // newPeerConnection creates a new downloader peer.
 func newPeerConnection(id string, version int, peer Peer, logger log.Logger) *peerConnection {
@@ -138,10 +140,6 @@ func (p *peerConnection) Reset() {
 
 // FetchHeaders sends a header retrieval request to the remote peer.
 func (p *peerConnection) FetchHeaders(from uint64, count int) error {
-	// Sanity check the protocol version
-	if p.version < 62 {
-		panic(fmt.Sprintf("header fetch [eth/62+] requested on eth/%d", p.version))
-	}
 	// Short circuit if the peer is already fetching
 	if !atomic.CompareAndSwapInt32(&p.headerIdle, 0, 1) {
 		return errAlreadyFetching
@@ -156,10 +154,6 @@ func (p *peerConnection) FetchHeaders(from uint64, count int) error {
 
 // FetchBodies sends a block body retrieval request to the remote peer.
 func (p *peerConnection) FetchBodies(request *fetchRequest) error {
-	// Sanity check the protocol version
-	if p.version < 62 {
-		panic(fmt.Sprintf("body fetch [eth/62+] requested on eth/%d", p.version))
-	}
 	// Short circuit if the peer is already fetching
 	if !atomic.CompareAndSwapInt32(&p.blockIdle, 0, 1) {
 		return errAlreadyFetching
@@ -180,10 +174,6 @@ func (p *peerConnection) FetchBodies(request *fetchRequest) error {
 
 // FetchReceipts sends a receipt retrieval request to the remote peer.
 func (p *peerConnection) FetchReceipts(request *fetchRequest) error {
-	// Sanity check the protocol version
-	if p.version < 63 {
-		panic(fmt.Sprintf("body fetch [eth/63+] requested on eth/%d", p.version))
-	}
 	// Short circuit if the peer is already fetching
 	if !atomic.CompareAndSwapInt32(&p.receiptIdle, 0, 1) {
 		return errAlreadyFetching