From 41b052ad87633d5a8a989c512c8710b875f2ba88 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Sun, 24 Mar 2013 16:52:24 +0100
Subject: Use per-message send buffer, rather than per connection

---
 src/net.cpp | 59 ++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 38 insertions(+), 21 deletions(-)

(limited to 'src/net.cpp')

diff --git a/src/net.cpp b/src/net.cpp
index 1016d5d9f0..9ee6cb423c 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -715,26 +715,43 @@ int CNetMessage::readData(const char *pch, unsigned int nBytes)
 // requires LOCK(cs_vSend)
 void SocketSendData(CNode *pnode)
 {
-    CDataStream& vSend = pnode->vSend;
-    if (vSend.empty())
-        return;
-
-    int nBytes = send(pnode->hSocket, &vSend[0], vSend.size(), MSG_NOSIGNAL | MSG_DONTWAIT);
-    if (nBytes > 0)
-    {
-        vSend.erase(vSend.begin(), vSend.begin() + nBytes);
-        pnode->nLastSend = GetTime();
-    }
-    else if (nBytes < 0)
-    {
-        // error
-        int nErr = WSAGetLastError();
-        if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
-        {
-            printf("socket send error %d\n", nErr);
-            pnode->CloseSocketDisconnect();
+    std::deque<CSerializeData>::iterator it = pnode->vSendMsg.begin();
+
+    while (it != pnode->vSendMsg.end()) {
+        const CSerializeData &data = *it;
+        assert(data.size() > pnode->nSendOffset);
+        int nBytes = send(pnode->hSocket, &data[pnode->nSendOffset], data.size() - pnode->nSendOffset, MSG_NOSIGNAL | MSG_DONTWAIT);
+        if (nBytes > 0) {
+            pnode->nLastSend = GetTime();
+            pnode->nSendOffset += nBytes;
+            if (pnode->nSendOffset == data.size()) {
+                pnode->nSendOffset = 0;
+                pnode->nSendSize -= data.size();
+                it++;
+            } else {
+                // could not send full message; stop sending more
+                break;
+            }
+        } else {
+            if (nBytes < 0) {
+                // error
+                int nErr = WSAGetLastError();
+                if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS)
+                {
+                    printf("socket send error %d\n", nErr);
+                    pnode->CloseSocketDisconnect();
+                }
+            }
+            // couldn't send anything at all
+            break;
         }
     }
+
+    if (it == pnode->vSendMsg.end()) {
+        assert(pnode->nSendOffset == 0);
+        assert(pnode->nSendSize == 0);
+    }
+    pnode->vSendMsg.erase(pnode->vSendMsg.begin(), it);
 }
 
 void ThreadSocketHandler(void* parg)
@@ -776,7 +793,7 @@ void ThreadSocketHandler2(void* parg)
             BOOST_FOREACH(CNode* pnode, vNodesCopy)
             {
                 if (pnode->fDisconnect ||
-                    (pnode->GetRefCount() <= 0 && pnode->vRecvMsg.empty() && pnode->vSend.empty()))
+                    (pnode->GetRefCount() <= 0 && pnode->vRecvMsg.empty() && pnode->nSendSize == 0 && pnode->ssSend.empty()))
                 {
                     // remove from vNodes
                     vNodes.erase(remove(vNodes.begin(), vNodes.end(), pnode), vNodes.end());
@@ -863,7 +880,7 @@ void ThreadSocketHandler2(void* parg)
                     TRY_LOCK(pnode->cs_vSend, lockSend);
                     if (lockSend) {
                         // do not read, if draining write queue
-                        if (!pnode->vSend.empty())
+                        if (!pnode->vSendMsg.empty())
                             FD_SET(pnode->hSocket, &fdsetSend);
                         else
                             FD_SET(pnode->hSocket, &fdsetRecv);
@@ -1032,7 +1049,7 @@ void ThreadSocketHandler2(void* parg)
             //
             // Inactivity checking
             //
-            if (pnode->vSend.empty())
+            if (pnode->vSendMsg.empty())
                 pnode->nLastSendEmpty = GetTime();
             if (GetTime() - pnode->nTimeConnected > 60)
             {
-- 
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