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connman is in charge of pushing messages

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The changes here are dense and subtle, but hopefully all is more explicit
than before.

- CConnman is now in charge of sending data rather than the nodes themselves.
  This is necessary because many decisions need to be made with all nodes in
  mind, and a model that requires the nodes calling up to their manager quickly
  turns to spaghetti.

- The per-node-serializer (ssSend) has been replaced with a (quasi-)const
  send-version. Since the send version for serialization can only change once
  per connection, we now explicitly tag messages with INIT_PROTO_VERSION if
  they are sent before the handshake. With this done, there's no need to lock
  for access to nSendVersion.

  Also, a new stream is used for each message, so there's no need to lock
  during the serialization process.

- This takes care of accounting for optimistic sends, so the
  nOptimisticBytesWritten hack can be removed.

- -dropmessagestest and -fuzzmessagestest have not been preserved, as I suspect
  they haven't been used in years.
This commit is contained in:
Cory Fields
2016-09-12 20:00:33 -04:00
committed by Pieter Wuille
parent b98c14c4e3
commit 3e32cd09f6
4 changed files with 135 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/main.cpp
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@@ -5047,7 +5047,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
// Each connection can only send one version message
if (pfrom->nVersion != 0)
{
pfrom->PushMessage(NetMsgType::REJECT, strCommand, REJECT_DUPLICATE, string("Duplicate version message"));
connman.PushMessageWithVersion(pfrom, INIT_PROTO_VERSION, NetMsgType::REJECT, strCommand, REJECT_DUPLICATE, string("Duplicate version message"));
LOCK(cs_main);
Misbehaving(pfrom->GetId(), 1);
return false;
@@ -5067,7 +5067,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
if (pfrom->nServicesExpected & ~pfrom->nServices)
{
LogPrint("net", "peer=%d does not offer the expected services (%08x offered, %08x expected); disconnecting\n", pfrom->id, pfrom->nServices, pfrom->nServicesExpected);
pfrom->PushMessage(NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD,
connman.PushMessageWithVersion(pfrom, INIT_PROTO_VERSION, NetMsgType::REJECT, strCommand, REJECT_NONSTANDARD,
strprintf("Expected to offer services %08x", pfrom->nServicesExpected));
pfrom->fDisconnect = true;
return false;
@@ -5077,7 +5077,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
{
// disconnect from peers older than this proto version
LogPrintf("peer=%d using obsolete version %i; disconnecting\n", pfrom->id, pfrom->nVersion);
pfrom->PushMessage(NetMsgType::REJECT, strCommand, REJECT_OBSOLETE,
connman.PushMessageWithVersion(pfrom, INIT_PROTO_VERSION, NetMsgType::REJECT, strCommand, REJECT_OBSOLETE,
strprintf("Version must be %d or greater", MIN_PEER_PROTO_VERSION));
pfrom->fDisconnect = true;
return false;
@@ -5118,7 +5118,7 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
// Be shy and don't send version until we hear
if (pfrom->fInbound)
pfrom->PushVersion();
connman.PushVersion(pfrom, GetAdjustedTime());
pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
@@ -5135,8 +5135,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
}
// Change version
pfrom->PushMessage(NetMsgType::VERACK);
pfrom->ssSend.SetVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
connman.PushMessageWithVersion(pfrom, INIT_PROTO_VERSION, NetMsgType::VERACK);
pfrom->SetSendVersion(min(pfrom->nVersion, PROTOCOL_VERSION));
if (!pfrom->fInbound)
{
@@ -6391,7 +6391,7 @@ bool ProcessMessages(CNode* pfrom, CConnman& connman)
}
catch (const std::ios_base::failure& e)
{
pfrom->PushMessage(NetMsgType::REJECT, strCommand, REJECT_MALFORMED, string("error parsing message"));
connman.PushMessageWithVersion(pfrom, INIT_PROTO_VERSION, NetMsgType::REJECT, strCommand, REJECT_MALFORMED, string("error parsing message"));
if (strstr(e.what(), "end of data"))
{
// Allow exceptions from under-length message on vRecv