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BIP 0031: pong message

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Add a pong message that is sent in reply to a ping. It echoes back a nonce
field that is now added to the ping message. Send a nonce of zero in ping
messages.

Original author: Mike Hearn @ Google

Modified Mike's change to introduce a mild form of protocol documentation in
version.h.
This commit is contained in:
Jeff Garzik 2012-04-11 12:38:03 -04:00 committed by Jeff Garzik
parent 940e22fd81
commit 93e447b631
2 changed files with 28 additions and 3 deletions
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28
src/main.cpp
View File

@ -2652,6 +2652,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv)
else if (strCommand == "ping")
{
if (pfrom->nVersion > BIP0031_VERSION)
{
uint64 nonce = 0;
vRecv >> nonce;
// Echo the message back with the nonce. This allows for two useful features:
//
// 1) A remote node can quickly check if the connection is operational
// 2) Remote nodes can measure the latency of the network thread. If this node
// is overloaded it won't respond to pings quickly and the remote node can
// avoid sending us more work, like chain download requests.
//
// The nonce stops the remote getting confused between different pings: without
// it, if the remote node sends a ping once per second and this node takes 5
// seconds to respond to each, the 5th ping the remote sends would appear to
// return very quickly.
pfrom->PushMessage("pong", nonce);
}
}
@ -2814,9 +2831,14 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
if (pto->nVersion == 0)
return true;
// Keep-alive ping
if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty())
pto->PushMessage("ping");
// Keep-alive ping. We send a nonce of zero because we don't use it anywhere
// right now.
if (pto->nLastSend && GetTime() - pto->nLastSend > 30 * 60 && pto->vSend.empty()) {
if (pto->nVersion > BIP0031_VERSION)
pto->PushMessage("ping", 0);
else
pto->PushMessage("ping");
}
// Resend wallet transactions that haven't gotten in a block yet
ResendWalletTransactions();

3
src/version.h
View File

@ -11,4 +11,7 @@ extern const std::string CLIENT_BUILD;
extern const std::string CLIENT_DATE;
extern const int CLIENT_VERSION;
// BIP 0031, pong message, is enabled for all versions AFTER this one
const int BIP0031_VERSION = 60000;
#endif