Process getdata invs separately until send buffer overflows

There exists a per-message-processed send buffer overflow protection,
where processing is halted when the send buffer is larger than the
allowed maximum.

This protection does not apply to individual items, however, and
getdata has the potential for causing large amounts of data to be
sent. In case several hundreds of blocks are requested in one getdata,
the send buffer can easily grow 50 megabytes above the send buffer
limit.

This commit breaks up the processing of getdata requests, remembering
them inside a CNode when too many are requested at once.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/net.h b/src/net.h
index 9805e39f18..368e4cd4bb 100644
--- a/src/net.h
+++ b/src/net.h
@@ -179,6 +179,7 @@ public:
     std::deque<CSerializeData> vSendMsg;
     CCriticalSection cs_vSend;
 
+    std::deque<CInv> vRecvGetData;
     std::deque<CNetMessage> vRecvMsg;
     CCriticalSection cs_vRecvMsg;
     int nRecvVersion;