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-rw-r--r--src/net_processing.cpp177
1 files changed, 97 insertions, 80 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 4a3076e3c7..f42a26ca3e 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -982,14 +982,12 @@ void Misbehaving(NodeId pnode, int howmuch, const std::string& message) EXCLUSIV
* banning/disconnecting us. We use this to determine which unaccepted
* transactions from a whitelisted peer that we can safely relay.
*/
-static bool TxRelayMayResultInDisconnect(const CValidationState& state)
-{
- assert(IsTransactionReason(state.GetReason()));
- return state.GetReason() == ValidationInvalidReason::CONSENSUS;
+static bool TxRelayMayResultInDisconnect(const TxValidationState& state) {
+ return state.GetResult() == TxValidationResult::TX_CONSENSUS;
}
/**
- * Potentially ban a node based on the contents of a CValidationState object
+ * Potentially ban a node based on the contents of a BlockValidationState object
*
* @param[in] via_compact_block: this bool is passed in because net_processing should
* punish peers differently depending on whether the data was provided in a compact
@@ -997,23 +995,21 @@ static bool TxRelayMayResultInDisconnect(const CValidationState& state)
* txs, the peer should not be punished. See BIP 152.
*
* @return Returns true if the peer was punished (probably disconnected)
- *
- * Changes here may need to be reflected in TxRelayMayResultInDisconnect().
*/
-static bool MaybePunishNode(NodeId nodeid, const CValidationState& state, bool via_compact_block, const std::string& message = "") {
- switch (state.GetReason()) {
- case ValidationInvalidReason::NONE:
+static bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state, bool via_compact_block, const std::string& message = "") {
+ switch (state.GetResult()) {
+ case BlockValidationResult::BLOCK_RESULT_UNSET:
break;
// The node is providing invalid data:
- case ValidationInvalidReason::CONSENSUS:
- case ValidationInvalidReason::BLOCK_MUTATED:
+ case BlockValidationResult::BLOCK_CONSENSUS:
+ case BlockValidationResult::BLOCK_MUTATED:
if (!via_compact_block) {
LOCK(cs_main);
Misbehaving(nodeid, 100, message);
return true;
}
break;
- case ValidationInvalidReason::CACHED_INVALID:
+ case BlockValidationResult::BLOCK_CACHED_INVALID:
{
LOCK(cs_main);
CNodeState *node_state = State(nodeid);
@@ -1029,30 +1025,24 @@ static bool MaybePunishNode(NodeId nodeid, const CValidationState& state, bool v
}
break;
}
- case ValidationInvalidReason::BLOCK_INVALID_HEADER:
- case ValidationInvalidReason::BLOCK_CHECKPOINT:
- case ValidationInvalidReason::BLOCK_INVALID_PREV:
+ case BlockValidationResult::BLOCK_INVALID_HEADER:
+ case BlockValidationResult::BLOCK_CHECKPOINT:
+ case BlockValidationResult::BLOCK_INVALID_PREV:
{
LOCK(cs_main);
Misbehaving(nodeid, 100, message);
}
return true;
// Conflicting (but not necessarily invalid) data or different policy:
- case ValidationInvalidReason::BLOCK_MISSING_PREV:
+ case BlockValidationResult::BLOCK_MISSING_PREV:
{
// TODO: Handle this much more gracefully (10 DoS points is super arbitrary)
LOCK(cs_main);
Misbehaving(nodeid, 10, message);
}
return true;
- case ValidationInvalidReason::RECENT_CONSENSUS_CHANGE:
- case ValidationInvalidReason::BLOCK_TIME_FUTURE:
- case ValidationInvalidReason::TX_NOT_STANDARD:
- case ValidationInvalidReason::TX_MISSING_INPUTS:
- case ValidationInvalidReason::TX_PREMATURE_SPEND:
- case ValidationInvalidReason::TX_WITNESS_MUTATED:
- case ValidationInvalidReason::TX_CONFLICT:
- case ValidationInvalidReason::TX_MEMPOOL_POLICY:
+ case BlockValidationResult::BLOCK_RECENT_CONSENSUS_CHANGE:
+ case BlockValidationResult::BLOCK_TIME_FUTURE:
break;
}
if (message != "") {
@@ -1061,6 +1051,39 @@ static bool MaybePunishNode(NodeId nodeid, const CValidationState& state, bool v
return false;
}
+/**
+ * Potentially ban a node based on the contents of a TxValidationState object
+ *
+ * @return Returns true if the peer was punished (probably disconnected)
+ *
+ * Changes here may need to be reflected in TxRelayMayResultInDisconnect().
+ */
+static bool MaybePunishNodeForTx(NodeId nodeid, const TxValidationState& state, const std::string& message = "") {
+ switch (state.GetResult()) {
+ case TxValidationResult::TX_RESULT_UNSET:
+ break;
+ // The node is providing invalid data:
+ case TxValidationResult::TX_CONSENSUS:
+ {
+ LOCK(cs_main);
+ Misbehaving(nodeid, 100, message);
+ return true;
+ }
+ // Conflicting (but not necessarily invalid) data or different policy:
+ case TxValidationResult::TX_RECENT_CONSENSUS_CHANGE:
+ case TxValidationResult::TX_NOT_STANDARD:
+ case TxValidationResult::TX_MISSING_INPUTS:
+ case TxValidationResult::TX_PREMATURE_SPEND:
+ case TxValidationResult::TX_WITNESS_MUTATED:
+ case TxValidationResult::TX_CONFLICT:
+ case TxValidationResult::TX_MEMPOOL_POLICY:
+ break;
+ }
+ if (message != "") {
+ LogPrint(BCLog::NET, "peer=%d: %s\n", nodeid, message);
+ }
+ return false;
+}
@@ -1229,7 +1252,7 @@ void PeerLogicValidation::UpdatedBlockTip(const CBlockIndex *pindexNew, const CB
* Handle invalid block rejection and consequent peer banning, maintain which
* peers announce compact blocks.
*/
-void PeerLogicValidation::BlockChecked(const CBlock& block, const CValidationState& state) {
+void PeerLogicValidation::BlockChecked(const CBlock& block, const BlockValidationState& state) {
LOCK(cs_main);
const uint256 hash(block.GetHash());
@@ -1240,7 +1263,7 @@ void PeerLogicValidation::BlockChecked(const CBlock& block, const CValidationSta
if (state.IsInvalid() &&
it != mapBlockSource.end() &&
State(it->second.first)) {
- MaybePunishNode(/*nodeid=*/ it->second.first, state, /*via_compact_block=*/ !it->second.second);
+ MaybePunishNodeForBlock(/*nodeid=*/ it->second.first, state, /*via_compact_block=*/ !it->second.second);
}
// Check that:
// 1. The block is valid
@@ -1317,7 +1340,7 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman* connma
// Relay to a limited number of other nodes
// Use deterministic randomness to send to the same nodes for 24 hours
- // at a time so the addrKnowns of the chosen nodes prevent repeats
+ // at a time so the m_addr_knowns of the chosen nodes prevent repeats
uint64_t hashAddr = addr.GetHash();
const CSipHasher hasher = connman->GetDeterministicRandomizer(RANDOMIZER_ID_ADDRESS_RELAY).Write(hashAddr << 32).Write((GetTime() + hashAddr) / (24*60*60));
FastRandomContext insecure_rand;
@@ -1378,7 +1401,7 @@ void static ProcessGetBlockData(CNode* pfrom, const CChainParams& chainparams, c
}
} // release cs_main before calling ActivateBestChain
if (need_activate_chain) {
- CValidationState state;
+ BlockValidationState state;
if (!ActivateBestChain(state, Params(), a_recent_block)) {
LogPrint(BCLog::NET, "failed to activate chain (%s)\n", FormatStateMessage(state));
}
@@ -1674,11 +1697,10 @@ bool static ProcessHeadersMessage(CNode *pfrom, CConnman *connman, const std::ve
}
}
- CValidationState state;
- CBlockHeader first_invalid_header;
- if (!ProcessNewBlockHeaders(headers, state, chainparams, &pindexLast, &first_invalid_header)) {
+ BlockValidationState state;
+ if (!ProcessNewBlockHeaders(headers, state, chainparams, &pindexLast)) {
if (state.IsInvalid()) {
- MaybePunishNode(pfrom->GetId(), state, via_compact_block, "invalid header received");
+ MaybePunishNodeForBlock(pfrom->GetId(), state, via_compact_block, "invalid header received");
return false;
}
}
@@ -1814,14 +1836,13 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se
const CTransactionRef porphanTx = orphan_it->second.tx;
const CTransaction& orphanTx = *porphanTx;
NodeId fromPeer = orphan_it->second.fromPeer;
- bool fMissingInputs2 = false;
- // Use a new CValidationState because orphans come from different peers (and we call
- // MaybePunishNode based on the source peer from the orphan map, not based on the peer
+ // Use a new TxValidationState because orphans come from different peers (and we call
+ // MaybePunishNodeForTx based on the source peer from the orphan map, not based on the peer
// that relayed the previous transaction).
- CValidationState orphan_state;
+ TxValidationState orphan_state;
if (setMisbehaving.count(fromPeer)) continue;
- if (AcceptToMemoryPool(mempool, orphan_state, porphanTx, &fMissingInputs2, &removed_txn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
+ if (AcceptToMemoryPool(mempool, orphan_state, porphanTx, &removed_txn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
LogPrint(BCLog::MEMPOOL, " accepted orphan tx %s\n", orphanHash.ToString());
RelayTransaction(orphanHash, *connman);
for (unsigned int i = 0; i < orphanTx.vout.size(); i++) {
@@ -1834,10 +1855,10 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se
}
EraseOrphanTx(orphanHash);
done = true;
- } else if (!fMissingInputs2) {
+ } else if (orphan_state.GetResult() != TxValidationResult::TX_MISSING_INPUTS) {
if (orphan_state.IsInvalid()) {
// Punish peer that gave us an invalid orphan tx
- if (MaybePunishNode(fromPeer, orphan_state, /*via_compact_block*/ false)) {
+ if (MaybePunishNodeForTx(fromPeer, orphan_state)) {
setMisbehaving.insert(fromPeer);
}
LogPrint(BCLog::MEMPOOL, " invalid orphan tx %s\n", orphanHash.ToString());
@@ -1845,8 +1866,7 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se
// Has inputs but not accepted to mempool
// Probably non-standard or insufficient fee
LogPrint(BCLog::MEMPOOL, " removed orphan tx %s\n", orphanHash.ToString());
- assert(IsTransactionReason(orphan_state.GetReason()));
- if (!orphanTx.HasWitness() && orphan_state.GetReason() != ValidationInvalidReason::TX_WITNESS_MUTATED) {
+ if (!orphanTx.HasWitness() && orphan_state.GetResult() != TxValidationResult::TX_WITNESS_MUTATED) {
// Do not use rejection cache for witness transactions or
// witness-stripped transactions, as they can have been malleated.
// See https://github.com/bitcoin/bitcoin/issues/8279 for details.
@@ -1860,7 +1880,7 @@ void static ProcessOrphanTx(CConnman* connman, std::set<uint256>& orphan_work_se
}
}
-bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman* connman, const std::atomic<bool>& interruptMsgProc)
+bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams, CConnman* connman, BanMan* banman, const std::atomic<bool>& interruptMsgProc)
{
LogPrint(BCLog::NET, "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->GetId());
if (gArgs.IsArgSet("-dropmessagestest") && GetRand(gArgs.GetArg("-dropmessagestest", 0)) == 0)
@@ -2136,7 +2156,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
if (addr.nTime <= 100000000 || addr.nTime > nNow + 10 * 60)
addr.nTime = nNow - 5 * 24 * 60 * 60;
pfrom->AddAddressKnown(addr);
- if (g_banman->IsBanned(addr)) continue; // Do not process banned addresses beyond remembering we received them
+ if (banman->IsBanned(addr)) continue; // Do not process banned addresses beyond remembering we received them
bool fReachable = IsReachable(addr);
if (addr.nTime > nSince && !pfrom->fGetAddr && vAddr.size() <= 10 && addr.IsRoutable())
{
@@ -2291,7 +2311,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LOCK(cs_most_recent_block);
a_recent_block = most_recent_block;
}
- CValidationState state;
+ BlockValidationState state;
if (!ActivateBestChain(state, Params(), a_recent_block)) {
LogPrint(BCLog::NET, "failed to activate chain (%s)\n", FormatStateMessage(state));
}
@@ -2471,8 +2491,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LOCK2(cs_main, g_cs_orphans);
- bool fMissingInputs = false;
- CValidationState state;
+ TxValidationState state;
CNodeState* nodestate = State(pfrom->GetId());
nodestate->m_tx_download.m_tx_announced.erase(inv.hash);
@@ -2482,7 +2501,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
std::list<CTransactionRef> lRemovedTxn;
if (!AlreadyHave(inv) &&
- AcceptToMemoryPool(mempool, state, ptx, &fMissingInputs, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
+ AcceptToMemoryPool(mempool, state, ptx, &lRemovedTxn, false /* bypass_limits */, 0 /* nAbsurdFee */)) {
mempool.check(&::ChainstateActive().CoinsTip());
RelayTransaction(tx.GetHash(), *connman);
for (unsigned int i = 0; i < tx.vout.size(); i++) {
@@ -2504,7 +2523,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
// Recursively process any orphan transactions that depended on this one
ProcessOrphanTx(connman, pfrom->orphan_work_set, lRemovedTxn);
}
- else if (fMissingInputs)
+ else if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS)
{
bool fRejectedParents = false; // It may be the case that the orphans parents have all been rejected
for (const CTxIn& txin : tx.vin) {
@@ -2537,8 +2556,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
recentRejects->insert(tx.GetHash());
}
} else {
- assert(IsTransactionReason(state.GetReason()));
- if (!tx.HasWitness() && state.GetReason() != ValidationInvalidReason::TX_WITNESS_MUTATED) {
+ if (!tx.HasWitness() && state.GetResult() != TxValidationResult::TX_WITNESS_MUTATED) {
// Do not use rejection cache for witness transactions or
// witness-stripped transactions, as they can have been malleated.
// See https://github.com/bitcoin/bitcoin/issues/8279 for details.
@@ -2593,7 +2611,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
LogPrint(BCLog::MEMPOOLREJ, "%s from peer=%d was not accepted: %s\n", tx.GetHash().ToString(),
pfrom->GetId(),
FormatStateMessage(state));
- MaybePunishNode(pfrom->GetId(), state, /*via_compact_block*/ false);
+ MaybePunishNodeForTx(pfrom->GetId(), state);
}
return true;
}
@@ -2627,10 +2645,10 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
}
const CBlockIndex *pindex = nullptr;
- CValidationState state;
+ BlockValidationState state;
if (!ProcessNewBlockHeaders({cmpctblock.header}, state, chainparams, &pindex)) {
if (state.IsInvalid()) {
- MaybePunishNode(pfrom->GetId(), state, /*via_compact_block*/ true, "invalid header via cmpctblock");
+ MaybePunishNodeForBlock(pfrom->GetId(), state, /*via_compact_block*/ true, "invalid header via cmpctblock");
return true;
}
}
@@ -2772,7 +2790,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
} // cs_main
if (fProcessBLOCKTXN)
- return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, interruptMsgProc);
+ return ProcessMessage(pfrom, NetMsgType::BLOCKTXN, blockTxnMsg, nTimeReceived, chainparams, connman, banman, interruptMsgProc);
if (fRevertToHeaderProcessing) {
// Headers received from HB compact block peers are permitted to be
@@ -2990,7 +3008,7 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
std::vector<CAddress> vAddr = connman->GetAddresses();
FastRandomContext insecure_rand;
for (const CAddress &addr : vAddr) {
- if (!g_banman->IsBanned(addr)) {
+ if (!banman->IsBanned(addr)) {
pfrom->PushAddress(addr, insecure_rand);
}
}
@@ -3272,41 +3290,37 @@ bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& inter
return false;
// Just take one message
msgs.splice(msgs.begin(), pfrom->vProcessMsg, pfrom->vProcessMsg.begin());
- pfrom->nProcessQueueSize -= msgs.front().vRecv.size() + CMessageHeader::HEADER_SIZE;
+ pfrom->nProcessQueueSize -= msgs.front().m_raw_message_size;
pfrom->fPauseRecv = pfrom->nProcessQueueSize > connman->GetReceiveFloodSize();
fMoreWork = !pfrom->vProcessMsg.empty();
}
CNetMessage& msg(msgs.front());
msg.SetVersion(pfrom->GetRecvVersion());
- // Scan for message start
- if (memcmp(msg.hdr.pchMessageStart, chainparams.MessageStart(), CMessageHeader::MESSAGE_START_SIZE) != 0) {
- LogPrint(BCLog::NET, "PROCESSMESSAGE: INVALID MESSAGESTART %s peer=%d\n", SanitizeString(msg.hdr.GetCommand()), pfrom->GetId());
+ // Check network magic
+ if (!msg.m_valid_netmagic) {
+ LogPrint(BCLog::NET, "PROCESSMESSAGE: INVALID MESSAGESTART %s peer=%d\n", SanitizeString(msg.m_command), pfrom->GetId());
pfrom->fDisconnect = true;
return false;
}
- // Read header
- CMessageHeader& hdr = msg.hdr;
- if (!hdr.IsValid(chainparams.MessageStart()))
+ // Check header
+ if (!msg.m_valid_header)
{
- LogPrint(BCLog::NET, "PROCESSMESSAGE: ERRORS IN HEADER %s peer=%d\n", SanitizeString(hdr.GetCommand()), pfrom->GetId());
+ LogPrint(BCLog::NET, "PROCESSMESSAGE: ERRORS IN HEADER %s peer=%d\n", SanitizeString(msg.m_command), pfrom->GetId());
return fMoreWork;
}
- std::string strCommand = hdr.GetCommand();
+ const std::string& strCommand = msg.m_command;
// Message size
- unsigned int nMessageSize = hdr.nMessageSize;
+ unsigned int nMessageSize = msg.m_message_size;
// Checksum
- CDataStream& vRecv = msg.vRecv;
- const uint256& hash = msg.GetMessageHash();
- if (memcmp(hash.begin(), hdr.pchChecksum, CMessageHeader::CHECKSUM_SIZE) != 0)
+ CDataStream& vRecv = msg.m_recv;
+ if (!msg.m_valid_checksum)
{
- LogPrint(BCLog::NET, "%s(%s, %u bytes): CHECKSUM ERROR expected %s was %s\n", __func__,
- SanitizeString(strCommand), nMessageSize,
- HexStr(hash.begin(), hash.begin()+CMessageHeader::CHECKSUM_SIZE),
- HexStr(hdr.pchChecksum, hdr.pchChecksum+CMessageHeader::CHECKSUM_SIZE));
+ LogPrint(BCLog::NET, "%s(%s, %u bytes): CHECKSUM ERROR peer=%d\n", __func__,
+ SanitizeString(strCommand), nMessageSize, pfrom->GetId());
return fMoreWork;
}
@@ -3314,7 +3328,7 @@ bool PeerLogicValidation::ProcessMessages(CNode* pfrom, std::atomic<bool>& inter
bool fRet = false;
try
{
- fRet = ProcessMessage(pfrom, strCommand, vRecv, msg.nTime, chainparams, connman, interruptMsgProc);
+ fRet = ProcessMessage(pfrom, strCommand, vRecv, msg.m_time, chainparams, connman, m_banman, interruptMsgProc);
if (interruptMsgProc)
return false;
if (!pfrom->vRecvGetData.empty())
@@ -3561,6 +3575,8 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
// Address refresh broadcast
int64_t nNow = GetTimeMicros();
+ auto current_time = GetTime<std::chrono::microseconds>();
+
if (pto->IsAddrRelayPeer() && !::ChainstateActive().IsInitialBlockDownload() && pto->nNextLocalAddrSend < nNow) {
AdvertiseLocal(pto);
pto->nNextLocalAddrSend = PoissonNextSend(nNow, AVG_LOCAL_ADDRESS_BROADCAST_INTERVAL);
@@ -3573,11 +3589,12 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
pto->nNextAddrSend = PoissonNextSend(nNow, AVG_ADDRESS_BROADCAST_INTERVAL);
std::vector<CAddress> vAddr;
vAddr.reserve(pto->vAddrToSend.size());
+ assert(pto->m_addr_known);
for (const CAddress& addr : pto->vAddrToSend)
{
- if (!pto->addrKnown.contains(addr.GetKey()))
+ if (!pto->m_addr_known->contains(addr.GetKey()))
{
- pto->addrKnown.insert(addr.GetKey());
+ pto->m_addr_known->insert(addr.GetKey());
vAddr.push_back(addr);
// receiver rejects addr messages larger than 1000
if (vAddr.size() >= 1000)
@@ -3781,13 +3798,13 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
LOCK(pto->m_tx_relay->cs_tx_inventory);
// Check whether periodic sends should happen
bool fSendTrickle = pto->HasPermission(PF_NOBAN);
- if (pto->m_tx_relay->nNextInvSend < nNow) {
+ if (pto->m_tx_relay->nNextInvSend < current_time) {
fSendTrickle = true;
if (pto->fInbound) {
- pto->m_tx_relay->nNextInvSend = connman->PoissonNextSendInbound(nNow, INVENTORY_BROADCAST_INTERVAL);
+ pto->m_tx_relay->nNextInvSend = std::chrono::microseconds{connman->PoissonNextSendInbound(nNow, INVENTORY_BROADCAST_INTERVAL)};
} else {
// Use half the delay for outbound peers, as there is less privacy concern for them.
- pto->m_tx_relay->nNextInvSend = PoissonNextSend(nNow, INVENTORY_BROADCAST_INTERVAL >> 1);
+ pto->m_tx_relay->nNextInvSend = PoissonNextSend(current_time, std::chrono::seconds{INVENTORY_BROADCAST_INTERVAL >> 1});
}
}
@@ -3902,7 +3919,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
connman->PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
// Detect whether we're stalling
- const auto current_time = GetTime<std::chrono::microseconds>();
+ current_time = GetTime<std::chrono::microseconds>();
// nNow is the current system time (GetTimeMicros is not mockable) and
// should be replaced by the mockable current_time eventually
nNow = GetTimeMicros();