addrman.cpp
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addrman.cpp
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	// Copyright (c) 2012 Pieter Wuille
	// Copyright (c) 2012-2016 The Bitcoin Core developers
	// Distributed under the MIT software license, see the accompanying
	// file COPYING or http://www.opensource.org/licenses/mit-license.php.

	#include <addrman.h>

	#include <hash.h>
	#include <logging.h>
	#include <serialize.h>

	#include <cmath>

	int CAddrInfo::GetTriedBucket(const uint256 &nKey,
	const std::vector<bool> &asmap) const {
	uint64_t hash1 =
	(CHashWriter(SER_GETHASH, 0) << nKey << GetKey()).GetCheapHash();
	uint64_t hash2 = (CHashWriter(SER_GETHASH, 0)
	<< nKey << GetGroup(asmap)
	<< (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP))
	.GetCheapHash();
	int tried_bucket = hash2 % ADDRMAN_TRIED_BUCKET_COUNT;
	uint32_t mapped_as = GetMappedAS(asmap);
	LogPrint(BCLog::NET, "IP %s mapped to AS%i belongs to tried bucket %i\n",
	ToStringIP(), mapped_as, tried_bucket);
	return tried_bucket;
	}

	int CAddrInfo::GetNewBucket(const uint256 &nKey, const CNetAddr &src,
	const std::vector<bool> &asmap) const {
	std::vector<uint8_t> vchSourceGroupKey = src.GetGroup(asmap);
	uint64_t hash1 = (CHashWriter(SER_GETHASH, 0)
	<< nKey << GetGroup(asmap) << vchSourceGroupKey)
	.GetCheapHash();
	uint64_t hash2 = (CHashWriter(SER_GETHASH, 0)
	<< nKey << vchSourceGroupKey
	<< (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP))
	.GetCheapHash();
	int new_bucket = hash2 % ADDRMAN_NEW_BUCKET_COUNT;
	uint32_t mapped_as = GetMappedAS(asmap);
	LogPrint(BCLog::NET, "IP %s mapped to AS%i belongs to new bucket %i\n",
	ToStringIP(), mapped_as, new_bucket);
	return new_bucket;
	}

	int CAddrInfo::GetBucketPosition(const uint256 &nKey, bool fNew,
	int nBucket) const {
	uint64_t hash1 = (CHashWriter(SER_GETHASH, 0)
	<< nKey << (fNew ? 'N' : 'K') << nBucket << GetKey())
	.GetCheapHash();
	return hash1 % ADDRMAN_BUCKET_SIZE;
	}

	bool CAddrInfo::IsTerrible(int64_t nNow) const {
	// never remove things tried in the last minute
	if (nLastTry && nLastTry >= nNow - 60) {
	return false;
	}

	// came in a flying DeLorean
	if (nTime > nNow + 10 * 60) {
	return true;
	}

	// not seen in recent history
	if (nTime == 0 \|\| nNow - nTime > ADDRMAN_HORIZON_DAYS * 24 * 60 * 60) {
	return true;
	}

	// tried N times and never a success
	if (nLastSuccess == 0 && nAttempts >= ADDRMAN_RETRIES) {
	return true;
	}

	if (nNow - nLastSuccess > ADDRMAN_MIN_FAIL_DAYS * 24 * 60 * 60 &&
	nAttempts >= ADDRMAN_MAX_FAILURES) {
	// N successive failures in the last week
	return true;
	}

	return false;
	}

	double CAddrInfo::GetChance(int64_t nNow) const {
	double fChance = 1.0;
	int64_t nSinceLastTry = std::max<int64_t>(nNow - nLastTry, 0);

	// deprioritize very recent attempts away
	if (nSinceLastTry < 60 * 10) {
	fChance *= 0.01;
	}

	// deprioritize 66% after each failed attempt, but at most 1/28th to avoid
	// the search taking forever or overly penalizing outages.
	fChance *= std::pow(0.66, std::min(nAttempts, 8));

	return fChance;
	}

	CAddrInfo CAddrMan::Find(const CNetAddr &addr, int pnId) {
	std::map<CNetAddr, int>::iterator it = mapAddr.find(addr);
	if (it == mapAddr.end()) {
	return nullptr;
	}
	if (pnId) {
	pnId = (it).second;
	}
	std::map<int, CAddrInfo>::iterator it2 = mapInfo.find((*it).second);
	if (it2 != mapInfo.end()) {
	return &(*it2).second;
	}
	return nullptr;
	}

	CAddrInfo *CAddrMan::Create(const CAddress &addr, const CNetAddr &addrSource,
	int *pnId) {
	int nId = nIdCount++;
	mapInfo[nId] = CAddrInfo(addr, addrSource);
	mapAddr[addr] = nId;
	mapInfo[nId].nRandomPos = vRandom.size();
	vRandom.push_back(nId);
	if (pnId) {
	*pnId = nId;
	}
	return &mapInfo[nId];
	}

	void CAddrMan::SwapRandom(unsigned int nRndPos1, unsigned int nRndPos2) {
	if (nRndPos1 == nRndPos2) {
	return;
	}

	assert(nRndPos1 < vRandom.size() && nRndPos2 < vRandom.size());

	int nId1 = vRandom[nRndPos1];
	int nId2 = vRandom[nRndPos2];

	assert(mapInfo.count(nId1) == 1);
	assert(mapInfo.count(nId2) == 1);

	mapInfo[nId1].nRandomPos = nRndPos2;
	mapInfo[nId2].nRandomPos = nRndPos1;

	vRandom[nRndPos1] = nId2;
	vRandom[nRndPos2] = nId1;
	}

	void CAddrMan::Delete(int nId) {
	assert(mapInfo.count(nId) != 0);
	CAddrInfo &info = mapInfo[nId];
	assert(!info.fInTried);
	assert(info.nRefCount == 0);

	SwapRandom(info.nRandomPos, vRandom.size() - 1);
	vRandom.pop_back();
	mapAddr.erase(info);
	mapInfo.erase(nId);
	nNew--;
	}

	void CAddrMan::ClearNew(int nUBucket, int nUBucketPos) {
	// if there is an entry in the specified bucket, delete it.
	if (vvNew[nUBucket][nUBucketPos] != -1) {
	int nIdDelete = vvNew[nUBucket][nUBucketPos];
	CAddrInfo &infoDelete = mapInfo[nIdDelete];
	assert(infoDelete.nRefCount > 0);
	infoDelete.nRefCount--;
	vvNew[nUBucket][nUBucketPos] = -1;
	if (infoDelete.nRefCount == 0) {
	Delete(nIdDelete);
	}
	}
	}

	void CAddrMan::MakeTried(CAddrInfo &info, int nId) {
	// remove the entry from all new buckets
	for (int bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; bucket++) {
	int pos = info.GetBucketPosition(nKey, true, bucket);
	if (vvNew[bucket][pos] == nId) {
	vvNew[bucket][pos] = -1;
	info.nRefCount--;
	}
	}
	nNew--;

	assert(info.nRefCount == 0);

	// which tried bucket to move the entry to
	int nKBucket = info.GetTriedBucket(nKey, m_asmap);
	int nKBucketPos = info.GetBucketPosition(nKey, false, nKBucket);

	// first make space to add it (the existing tried entry there is moved to
	// new, deleting whatever is there).
	if (vvTried[nKBucket][nKBucketPos] != -1) {
	// find an item to evict
	int nIdEvict = vvTried[nKBucket][nKBucketPos];
	assert(mapInfo.count(nIdEvict) == 1);
	CAddrInfo &infoOld = mapInfo[nIdEvict];

	// Remove the to-be-evicted item from the tried set.
	infoOld.fInTried = false;
	vvTried[nKBucket][nKBucketPos] = -1;
	nTried--;

	// find which new bucket it belongs to
	int nUBucket = infoOld.GetNewBucket(nKey, m_asmap);
	int nUBucketPos = infoOld.GetBucketPosition(nKey, true, nUBucket);
	ClearNew(nUBucket, nUBucketPos);
	assert(vvNew[nUBucket][nUBucketPos] == -1);

	// Enter it into the new set again.
	infoOld.nRefCount = 1;
	vvNew[nUBucket][nUBucketPos] = nIdEvict;
	nNew++;
	}
	assert(vvTried[nKBucket][nKBucketPos] == -1);

	vvTried[nKBucket][nKBucketPos] = nId;
	nTried++;
	info.fInTried = true;
	}

	void CAddrMan::Good_(const CService &addr, bool test_before_evict,
	int64_t nTime) {
	int nId;

	nLastGood = nTime;

	CAddrInfo *pinfo = Find(addr, &nId);

	// if not found, bail out
	if (!pinfo) {
	return;
	}

	CAddrInfo &info = *pinfo;

	// check whether we are talking about the exact same CService (including
	// same port)
	if (info != addr) {
	return;
	}

	// update info
	info.nLastSuccess = nTime;
	info.nLastTry = nTime;
	info.nAttempts = 0;
	// nTime is not updated here, to avoid leaking information about
	// currently-connected peers.

	// if it is already in the tried set, don't do anything else
	if (info.fInTried) {
	return;
	}

	// find a bucket it is in now
	int nRnd = insecure_rand.randrange(ADDRMAN_NEW_BUCKET_COUNT);
	int nUBucket = -1;
	for (unsigned int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
	int nB = (n + nRnd) % ADDRMAN_NEW_BUCKET_COUNT;
	int nBpos = info.GetBucketPosition(nKey, true, nB);
	if (vvNew[nB][nBpos] == nId) {
	nUBucket = nB;
	break;
	}
	}

	// if no bucket is found, something bad happened;
	// TODO: maybe re-add the node, but for now, just bail out
	if (nUBucket == -1) {
	return;
	}

	// which tried bucket to move the entry to
	int tried_bucket = info.GetTriedBucket(nKey, m_asmap);
	int tried_bucket_pos = info.GetBucketPosition(nKey, false, tried_bucket);

	// Will moving this address into tried evict another entry?
	if (test_before_evict && (vvTried[tried_bucket][tried_bucket_pos] != -1)) {
	// Output the entry we'd be colliding with, for debugging purposes
	auto colliding_entry =
	mapInfo.find(vvTried[tried_bucket][tried_bucket_pos]);
	LogPrint(BCLog::ADDRMAN,
	"Collision inserting element into tried table (%s), moving %s "
	"to m_tried_collisions=%d\n",
	colliding_entry != mapInfo.end()
	? colliding_entry->second.ToString()
	: "",
	addr.ToString(), m_tried_collisions.size());
	if (m_tried_collisions.size() < ADDRMAN_SET_TRIED_COLLISION_SIZE) {
	m_tried_collisions.insert(nId);
	}
	} else {
	LogPrint(BCLog::ADDRMAN, "Moving %s to tried\n", addr.ToString());

	// move nId to the tried tables
	MakeTried(info, nId);
	}
	}

	bool CAddrMan::Add_(const CAddress &addr, const CNetAddr &source,
	int64_t nTimePenalty) {
	if (!addr.IsRoutable()) {
	return false;
	}

	bool fNew = false;
	int nId;
	CAddrInfo *pinfo = Find(addr, &nId);

	// Do not set a penalty for a source's self-announcement
	if (addr == source) {
	nTimePenalty = 0;
	}

	if (pinfo) {
	// periodically update nTime
	bool fCurrentlyOnline = (GetAdjustedTime() - addr.nTime < 24 * 60 * 60);
	int64_t nUpdateInterval = (fCurrentlyOnline ? 60 * 60 : 24 * 60 * 60);
	if (addr.nTime &&
	(!pinfo->nTime \|\|
	pinfo->nTime < addr.nTime - nUpdateInterval - nTimePenalty)) {
	pinfo->nTime = std::max((int64_t)0, addr.nTime - nTimePenalty);
	}

	// add services
	pinfo->nServices = ServiceFlags(pinfo->nServices \| addr.nServices);

	// do not update if no new information is present
	if (!addr.nTime \|\| (pinfo->nTime && addr.nTime <= pinfo->nTime)) {
	return false;
	}

	// do not update if the entry was already in the "tried" table
	if (pinfo->fInTried) {
	return false;
	}

	// do not update if the max reference count is reached
	if (pinfo->nRefCount == ADDRMAN_NEW_BUCKETS_PER_ADDRESS) {
	return false;
	}

	// stochastic test: previous nRefCount == N: 2^N times harder to
	// increase it
	int nFactor = 1;
	for (int n = 0; n < pinfo->nRefCount; n++) {
	nFactor *= 2;
	}

	if (nFactor > 1 && (insecure_rand.randrange(nFactor) != 0)) {
	return false;
	}
	} else {
	pinfo = Create(addr, source, &nId);
	pinfo->nTime =
	std::max((int64_t)0, (int64_t)pinfo->nTime - nTimePenalty);
	nNew++;
	fNew = true;
	}

	int nUBucket = pinfo->GetNewBucket(nKey, source, m_asmap);
	int nUBucketPos = pinfo->GetBucketPosition(nKey, true, nUBucket);
	if (vvNew[nUBucket][nUBucketPos] != nId) {
	bool fInsert = vvNew[nUBucket][nUBucketPos] == -1;
	if (!fInsert) {
	CAddrInfo &infoExisting = mapInfo[vvNew[nUBucket][nUBucketPos]];
	if (infoExisting.IsTerrible() \|\|
	(infoExisting.nRefCount > 1 && pinfo->nRefCount == 0)) {
	// Overwrite the existing new table entry.
	fInsert = true;
	}
	}
	if (fInsert) {
	ClearNew(nUBucket, nUBucketPos);
	pinfo->nRefCount++;
	vvNew[nUBucket][nUBucketPos] = nId;
	} else if (pinfo->nRefCount == 0) {
	Delete(nId);
	}
	}
	return fNew;
	}

	void CAddrMan::Attempt_(const CService &addr, bool fCountFailure,
	int64_t nTime) {
	CAddrInfo *pinfo = Find(addr);

	// if not found, bail out
	if (!pinfo) {
	return;
	}

	CAddrInfo &info = *pinfo;

	// check whether we are talking about the exact same CService (including
	// same port)
	if (info != addr) {
	return;
	}

	// update info
	info.nLastTry = nTime;
	if (fCountFailure && info.nLastCountAttempt < nLastGood) {
	info.nLastCountAttempt = nTime;
	info.nAttempts++;
	}
	}

	CAddrInfo CAddrMan::Select_(bool newOnly) {
	if (size() == 0) {
	return CAddrInfo();
	}

	if (newOnly && nNew == 0) {
	return CAddrInfo();
	}

	// Use a 50% chance for choosing between tried and new table entries.
	if (!newOnly &&
	(nTried > 0 && (nNew == 0 \|\| insecure_rand.randbool() == 0))) {
	// use a tried node
	double fChanceFactor = 1.0;
	while (1) {
	int nKBucket = insecure_rand.randrange(ADDRMAN_TRIED_BUCKET_COUNT);
	int nKBucketPos = insecure_rand.randrange(ADDRMAN_BUCKET_SIZE);
	while (vvTried[nKBucket][nKBucketPos] == -1) {
	nKBucket = (nKBucket + insecure_rand.randbits(
	ADDRMAN_TRIED_BUCKET_COUNT_LOG2)) %
	ADDRMAN_TRIED_BUCKET_COUNT;
	nKBucketPos = (nKBucketPos + insecure_rand.randbits(
	ADDRMAN_BUCKET_SIZE_LOG2)) %
	ADDRMAN_BUCKET_SIZE;
	}
	int nId = vvTried[nKBucket][nKBucketPos];
	assert(mapInfo.count(nId) == 1);
	CAddrInfo &info = mapInfo[nId];
	if (insecure_rand.randbits(30) <
	fChanceFactor * info.GetChance() * (1 << 30)) {
	return info;
	}
	fChanceFactor *= 1.2;
	}
	} else {
	// use a new node
	double fChanceFactor = 1.0;
	while (1) {
	int nUBucket = insecure_rand.randrange(ADDRMAN_NEW_BUCKET_COUNT);
	int nUBucketPos = insecure_rand.randrange(ADDRMAN_BUCKET_SIZE);
	while (vvNew[nUBucket][nUBucketPos] == -1) {
	nUBucket = (nUBucket + insecure_rand.randbits(
	ADDRMAN_NEW_BUCKET_COUNT_LOG2)) %
	ADDRMAN_NEW_BUCKET_COUNT;
	nUBucketPos = (nUBucketPos + insecure_rand.randbits(
	ADDRMAN_BUCKET_SIZE_LOG2)) %
	ADDRMAN_BUCKET_SIZE;
	}
	int nId = vvNew[nUBucket][nUBucketPos];
	assert(mapInfo.count(nId) == 1);
	CAddrInfo &info = mapInfo[nId];
	if (insecure_rand.randbits(30) <
	fChanceFactor * info.GetChance() * (1 << 30)) {
	return info;
	}
	fChanceFactor *= 1.2;
	}
	}
	}

	#ifdef DEBUG_ADDRMAN
	int CAddrMan::Check_() {
	std::set<int> setTried;
	std::map<int, int> mapNew;

	if (vRandom.size() != size_t(nTried + nNew)) {
	return -7;
	}

	for (const auto &entry : mapInfo) {
	int n = entry.first;
	const CAddrInfo &info = entry.second;
	if (info.fInTried) {
	if (!info.nLastSuccess) {
	return -1;
	}
	if (info.nRefCount) {
	return -2;
	}
	setTried.insert(n);
	} else {
	if (info.nRefCount < 0 \|\|
	info.nRefCount > ADDRMAN_NEW_BUCKETS_PER_ADDRESS) {
	return -3;
	}
	if (!info.nRefCount) {
	return -4;
	}
	mapNew[n] = info.nRefCount;
	}
	if (mapAddr[info] != n) {
	return -5;
	}
	if (info.nRandomPos < 0 \|\| size_t(info.nRandomPos) >= vRandom.size() \|\|
	vRandom[info.nRandomPos] != n) {
	return -14;
	}
	if (info.nLastTry < 0) {
	return -6;
	}
	if (info.nLastSuccess < 0) {
	return -8;
	}
	}

	if (setTried.size() != size_t(nTried)) {
	return -9;
	}
	if (mapNew.size() != size_t(nNew)) {
	return -10;
	}

	for (int n = 0; n < ADDRMAN_TRIED_BUCKET_COUNT; n++) {
	for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
	if (vvTried[n][i] != -1) {
	if (!setTried.count(vvTried[n][i])) {
	return -11;
	}
	if (mapInfo[vvTried[n][i]].GetTriedBucket(nKey, m_asmap) != n) {
	return -17;
	}
	if (mapInfo[vvTried[n][i]].GetBucketPosition(nKey, false, n) !=
	i) {
	return -18;
	}
	setTried.erase(vvTried[n][i]);
	}
	}
	}

	for (int n = 0; n < ADDRMAN_NEW_BUCKET_COUNT; n++) {
	for (int i = 0; i < ADDRMAN_BUCKET_SIZE; i++) {
	if (vvNew[n][i] != -1) {
	if (!mapNew.count(vvNew[n][i])) {
	return -12;
	}
	if (mapInfo[vvNew[n][i]].GetBucketPosition(nKey, true, n) !=
	i) {
	return -19;
	}
	if (--mapNew[vvNew[n][i]] == 0) {
	mapNew.erase(vvNew[n][i]);
	}
	}
	}
	}

	if (setTried.size()) {
	return -13;
	}
	if (mapNew.size()) {
	return -15;
	}
	if (nKey.IsNull()) {
	return -16;
	}

	return 0;
	}
	#endif

	void CAddrMan::GetAddr_(std::vector<CAddress> &vAddr) {
	unsigned int nNodes = ADDRMAN_GETADDR_MAX_PCT * vRandom.size() / 100;
	if (nNodes > ADDRMAN_GETADDR_MAX) {
	nNodes = ADDRMAN_GETADDR_MAX;
	}

	// gather a list of random nodes, skipping those of low quality
	for (unsigned int n = 0; n < vRandom.size(); n++) {
	if (vAddr.size() >= nNodes) {
	break;
	}

	int nRndPos = insecure_rand.randrange(vRandom.size() - n) + n;
	SwapRandom(n, nRndPos);
	assert(mapInfo.count(vRandom[n]) == 1);

	const CAddrInfo &ai = mapInfo[vRandom[n]];
	if (!ai.IsTerrible()) {
	vAddr.push_back(ai);
	}
	}
	}

	void CAddrMan::Connected_(const CService &addr, int64_t nTime) {
	CAddrInfo *pinfo = Find(addr);

	// if not found, bail out
	if (!pinfo) {
	return;
	}

	CAddrInfo &info = *pinfo;

	// check whether we are talking about the exact same CService (including
	// same port)
	if (info != addr) {
	return;
	}

	// update info
	int64_t nUpdateInterval = 20 * 60;
	if (nTime - info.nTime > nUpdateInterval) {
	info.nTime = nTime;
	}
	}

	void CAddrMan::SetServices_(const CService &addr, ServiceFlags nServices) {
	CAddrInfo *pinfo = Find(addr);

	// if not found, bail out
	if (!pinfo) {
	return;
	}

	CAddrInfo &info = *pinfo;

	// check whether we are talking about the exact same CService (including
	// same port)
	if (info != addr) {
	return;
	}

	// update info
	info.nServices = nServices;
	}

	void CAddrMan::ResolveCollisions_() {
	const int64_t adjustedTime = GetAdjustedTime();

	for (std::set<int>::iterator it = m_tried_collisions.begin();
	it != m_tried_collisions.end();) {
	int id_new = *it;

	bool erase_collision = false;

	// If id_new not found in mapInfo remove it from m_tried_collisions.
	auto id_new_it = mapInfo.find(id_new);
	if (id_new_it == mapInfo.end()) {
	erase_collision = true;
	} else {
	CAddrInfo &info_new = id_new_it->second;

	// Which tried bucket to move the entry to.
	int tried_bucket = info_new.GetTriedBucket(nKey, m_asmap);
	int tried_bucket_pos =
	info_new.GetBucketPosition(nKey, false, tried_bucket);
	if (!info_new.IsValid()) {
	// id_new may no longer map to a valid address
	erase_collision = true;
	} else if (vvTried[tried_bucket][tried_bucket_pos] != -1) {
	// The position in the tried bucket is not empty

	// Get the to-be-evicted address that is being tested
	int id_old = vvTried[tried_bucket][tried_bucket_pos];
	CAddrInfo &info_old = mapInfo[id_old];

	// Has successfully connected in last X hours
	if (adjustedTime - info_old.nLastSuccess <
	ADDRMAN_REPLACEMENT_SECONDS) {
	erase_collision = true;
	} else if (adjustedTime - info_old.nLastTry <
	ADDRMAN_REPLACEMENT_SECONDS) {
	// attempted to connect and failed in last X hours

	// Give address at least 60 seconds to successfully connect
	if (GetAdjustedTime() - info_old.nLastTry > 60) {
	LogPrint(BCLog::ADDRMAN,
	"Replacing %s with %s in tried table\n",
	info_old.ToString(), info_new.ToString());

	// Replaces an existing address already in the tried
	// table with the new address
	Good_(info_new, false, GetAdjustedTime());
	erase_collision = true;
	}
	} else if (GetAdjustedTime() - info_new.nLastSuccess >
	ADDRMAN_TEST_WINDOW) {
	// If the collision hasn't resolved in some reasonable
	// amount of time, just evict the old entry -- we must not
	// be able to connect to it for some reason.
	LogPrint(BCLog::ADDRMAN,
	"Unable to test; replacing %s with %s in tried "
	"table anyway\n",
	info_old.ToString(), info_new.ToString());
	Good_(info_new, false, GetAdjustedTime());
	erase_collision = true;
	}
	} else {
	// Collision is not actually a collision anymore
	Good_(info_new, false, adjustedTime);
	erase_collision = true;
	}
	}

	if (erase_collision) {
	m_tried_collisions.erase(it++);
	} else {
	it++;
	}
	}
	}

	CAddrInfo CAddrMan::SelectTriedCollision_() {
	if (m_tried_collisions.size() == 0) {
	return CAddrInfo();
	}

	std::set<int>::iterator it = m_tried_collisions.begin();

	// Selects a random element from m_tried_collisions
	std::advance(it, insecure_rand.randrange(m_tried_collisions.size()));
	int id_new = *it;

	// If id_new not found in mapInfo remove it from m_tried_collisions.
	auto id_new_it = mapInfo.find(id_new);
	if (id_new_it == mapInfo.end()) {
	m_tried_collisions.erase(it);
	return CAddrInfo();
	}

	CAddrInfo &newInfo = id_new_it->second;

	// which tried bucket to move the entry to
	int tried_bucket = newInfo.GetTriedBucket(nKey, m_asmap);
	int tried_bucket_pos = newInfo.GetBucketPosition(nKey, false, tried_bucket);

	int id_old = vvTried[tried_bucket][tried_bucket_pos];

	return mapInfo[id_old];
	}

	std::vector<bool> CAddrMan::DecodeAsmap(fs::path path) {
	std::vector<bool> bits;
	FILE *filestr = fsbridge::fopen(path, "rb");
	CAutoFile file(filestr, SER_DISK, CLIENT_VERSION);
	if (file.IsNull()) {
	LogPrintf("Failed to open asmap file from disk\n");
	return bits;
	}
	fseek(filestr, 0, SEEK_END);
	int length = ftell(filestr);
	LogPrintf("Opened asmap file %s (%d bytes) from disk\n", path, length);
	fseek(filestr, 0, SEEK_SET);
	char cur_byte;
	for (int i = 0; i < length; ++i) {
	file >> cur_byte;
	for (int bit = 0; bit < 8; ++bit) {
	bits.push_back((cur_byte >> bit) & 1);
	}
	}
	return bits;
	}

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