eth/fetcher: drop peer if block too high

[0xcb9ff9]

Description

synchronization stop under boundary conditions:

• peer block too high
• local node run in slow disk (Block execute too long)
• local node more than 32 block

forgetHash remove peer count, but not drop peer, if notification block too high, never fetch block from the peer

dbsc/eth/fetcher/block_fetcher.go

Lines 933 to 946 in ce0dbc3

	func (f *BlockFetcher) forgetHash(hash common.Hash) {
	// Remove all pending announces and decrement DOS counters
	if announceMap, ok := f.announced[hash]; ok {
	for _, announce := range announceMap {
	f.announces[announce.origin]--
	if f.announces[announce.origin] <= 0 {
	delete(f.announces, announce.origin)
	}
	}
	delete(f.announced, hash)
	if f.announceChangeHook != nil {
	f.announceChangeHook(hash, false)
	}
	}

[DarianShawn]

LGTM