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net: add a flag to indicate when a node's send buffer is full

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Similar to the recv flag, but this one indicates whether or not the net's send
buffer is full.

The socket handler checks the send queue when a new message is added and pauses
if necessary, and possibly unpauses after each message is drained from its buffer.
This commit is contained in:
Cory Fields
2016-12-31 02:05:32 -05:00
parent c6e8a9bcff
commit 991955ee81
3 changed files with 12 additions and 8 deletions
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6
src/net_processing.cpp
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@@ -889,14 +889,13 @@ static void RelayAddress(const CAddress& addr, bool fReachable, CConnman& connma
void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParams, CConnman& connman, std::atomic<bool>& interruptMsgProc)
{
std::deque<CInv>::iterator it = pfrom->vRecvGetData.begin();
unsigned int nMaxSendBufferSize = connman.GetSendBufferSize();
vector<CInv> vNotFound;
CNetMsgMaker msgMaker(pfrom->GetSendVersion());
LOCK(cs_main);
while (it != pfrom->vRecvGetData.end()) {
// Don't bother if send buffer is too full to respond anyway
if (pfrom->nSendSize >= nMaxSendBufferSize)
if (pfrom->fPauseSend)
break;
const CInv &inv = *it;
@@ -2444,7 +2443,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
bool ProcessMessages(CNode* pfrom, CConnman& connman, std::atomic<bool>& interruptMsgProc)
{
const CChainParams& chainparams = Params();
unsigned int nMaxSendBufferSize = connman.GetSendBufferSize();
//
// Message format
// (4) message start
@@ -2465,7 +2463,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman, std::atomic<bool>& interru
if (!pfrom->vRecvGetData.empty()) return true;
// Don't bother if send buffer is too full to respond anyway
if (pfrom->nSendSize >= nMaxSendBufferSize)
if (pfrom->fPauseSend)
return false;
std::list<CNetMessage> msgs;