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Merge pull request #2937

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971bb3e Added ping time measurement. New RPC "ping" command to request ping. Implemented "pong" message handler. New "pingtime" field in getpeerinfo, to provide results to user. New "pingwait" field, to show pings still in flight, to better see newly lagging peers. (Josh Lehan)
This commit is contained in:
Pieter Wuille
2013-10-13 17:37:02 +02:00
parent c74b6c3d8f 971bb3e901
commit 9269d0e96e
6 changed files with 131 additions and 4 deletions
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85
src/main.cpp
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@@ -3863,6 +3863,63 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
}
else if (strCommand == "pong")
{
int64 pingUsecEnd = GetTimeMicros();
uint64 nonce = 0;
size_t nAvail = vRecv.in_avail();
bool bPingFinished = false;
std::string sProblem;
if (nAvail >= sizeof(nonce)) {
vRecv >> nonce;
// Only process pong message if there is an outstanding ping (old ping without nonce should never pong)
if (pfrom->nPingNonceSent != 0) {
if (nonce == pfrom->nPingNonceSent) {
// Matching pong received, this ping is no longer outstanding
bPingFinished = true;
int64 pingUsecTime = pingUsecEnd - pfrom->nPingUsecStart;
if (pingUsecTime > 0) {
// Successful ping time measurement, replace previous
pfrom->nPingUsecTime = pingUsecTime;
} else {
// This should never happen
sProblem = "Timing mishap";
}
} else {
// Nonce mismatches are normal when pings are overlapping
sProblem = "Nonce mismatch";
if (nonce == 0) {
// This is most likely a bug in another implementation somewhere, cancel this ping
bPingFinished = true;
sProblem = "Nonce zero";
}
}
} else {
sProblem = "Unsolicited pong without ping";
}
} else {
// This is most likely a bug in another implementation somewhere, cancel this ping
bPingFinished = true;
sProblem = "Short payload";
}
if (!(sProblem.empty())) {
LogPrint("net", "pong %s %s: %s, %"PRI64x" expected, %"PRI64x" received, %zu bytes\n"
, pfrom->addr.ToString().c_str()
, pfrom->strSubVer.c_str()
, sProblem.c_str()
, pfrom->nPingNonceSent
, nonce
, nAvail);
}
if (bPingFinished) {
pfrom->nPingNonceSent = 0;
}
}
else if (strCommand == "alert")
{
CAlert alert;
@@ -4084,14 +4141,34 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
if (pto->nVersion == 0)
return true;
// Keep-alive ping. We send a nonce of zero because we don't use it anywhere
// right now.
//
// Message: ping
//
bool pingSend = false;
if (pto->fPingQueued) {
// RPC ping request by user
pingSend = true;
}
if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSendMsg.empty()) {
// Ping automatically sent as a keepalive
pingSend = true;
}
if (pingSend) {
uint64 nonce = 0;
if (pto->nVersion > BIP0031_VERSION)
while (nonce == 0) {
RAND_bytes((unsigned char*)&nonce, sizeof(nonce));
}
pto->nPingNonceSent = nonce;
pto->fPingQueued = false;
if (pto->nVersion > BIP0031_VERSION) {
// Take timestamp as close as possible before transmitting ping
pto->nPingUsecStart = GetTimeMicros();
pto->PushMessage("ping", nonce);
else
} else {
// Peer is too old to support ping command with nonce, pong will never arrive, disable timing
pto->nPingUsecStart = 0;
pto->PushMessage("ping");
}
}
// Start block sync