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BIP144: Handshake and relay (receiver side)

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Service bit logic by Nicolas Dorier.

Only download blocks from witness peers after fork.
This commit is contained in:
Pieter Wuille 2015-11-17 00:20:49 +01:00
parent 8b49040854
commit b8a97498df
6 changed files with 60 additions and 9 deletions
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12
src/init.cpp
View file

@ -1377,6 +1377,18 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
}
}
if (Params().GetConsensus().vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout != 0) {
// Only advertize witness capabilities if they have a reasonable start time.
// This allows us to have the code merged without a defined softfork, by setting its
// end time to 0.
// Note that setting NODE_WITNESS is never required: the only downside from not
// doing so is that after activation, no upgraded nodes will fetch from you.
nLocalServices = ServiceFlags(nLocalServices | NODE_WITNESS);
// Only care about others providing witness capabilities if there is a softfork
// defined.
nRelevantServices = ServiceFlags(nRelevantServices | NODE_WITNESS);
}
// ********************************************************* Step 10: import blocks
if (mapArgs.count("-blocknotify"))

38
src/main.cpp
View file

@ -313,6 +313,7 @@ struct CNodeState {
fPreferHeaders = false;
fPreferHeaderAndIDs = false;
fProvidesHeaderAndIDs = false;
fHaveWitness = false;
}
};
@ -4812,6 +4813,14 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam
}
}
uint32_t GetFetchFlags(CNode* pfrom, CBlockIndex* pprev, const Consensus::Params& chainparams) {
uint32_t nFetchFlags = 0;
if (IsWitnessEnabled(pprev, chainparams) && State(pfrom->GetId())->fHaveWitness) {
nFetchFlags |= MSG_WITNESS_FLAG;
}
return nFetchFlags;
}
bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, int64_t nTimeReceived, const CChainParams& chainparams)
{
LogPrint("net", "received: %s (%u bytes) peer=%d\n", SanitizeString(strCommand), vRecv.size(), pfrom->id);
@ -4918,6 +4927,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
pfrom->fClient = !(pfrom->nServices & NODE_NETWORK);
if((pfrom->nServices & NODE_WITNESS))
{
LOCK(cs_main);
State(pfrom->GetId())->fHaveWitness = true;
}
// Potentially mark this peer as a preferred download peer.
{
LOCK(cs_main);
@ -5119,17 +5134,23 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
LOCK(cs_main);
uint32_t nFetchFlags = GetFetchFlags(pfrom, chainActive.Tip(), chainparams.GetConsensus());
std::vector<CInv> vToFetch;
for (unsigned int nInv = 0; nInv < vInv.size(); nInv++)
{
const CInv &inv = vInv[nInv];
CInv &inv = vInv[nInv];
boost::this_thread::interruption_point();
bool fAlreadyHave = AlreadyHave(inv);
LogPrint("net", "got inv: %s %s peer=%d\n", inv.ToString(), fAlreadyHave ? "have" : "new", pfrom->id);
if (inv.type == MSG_TX) {
inv.type |= nFetchFlags;
}
if (inv.type == MSG_BLOCK) {
UpdateBlockAvailability(pfrom->GetId(), inv.hash);
if (!fAlreadyHave && !fImporting && !fReindex && !mapBlocksInFlight.count(inv.hash)) {
@ -5144,7 +5165,9 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
pfrom->PushMessage(NetMsgType::GETHEADERS, chainActive.GetLocator(pindexBestHeader), inv.hash);
CNodeState *nodestate = State(pfrom->GetId());
if (CanDirectFetch(chainparams.GetConsensus()) &&
nodestate->nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
nodestate->nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER &&
(!IsWitnessEnabled(chainActive.Tip(), chainparams.GetConsensus()) || State(pfrom->GetId())->fHaveWitness)) {
inv.type |= nFetchFlags;
if (nodestate->fProvidesHeaderAndIDs)
vToFetch.push_back(CInv(MSG_CMPCT_BLOCK, inv.hash));
else
@ -5730,7 +5753,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
// Calculate all the blocks we'd need to switch to pindexLast, up to a limit.
while (pindexWalk && !chainActive.Contains(pindexWalk) && vToFetch.size() <= MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
if (!(pindexWalk->nStatus & BLOCK_HAVE_DATA) &&
!mapBlocksInFlight.count(pindexWalk->GetBlockHash())) {
!mapBlocksInFlight.count(pindexWalk->GetBlockHash()) &&
(!IsWitnessEnabled(pindexWalk->pprev, chainparams.GetConsensus()) || State(pfrom->GetId())->fHaveWitness)) {
// We don't have this block, and it's not yet in flight.
vToFetch.push_back(pindexWalk);
}
@ -5752,7 +5776,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
// Can't download any more from this peer
break;
}
vGetData.push_back(CInv(MSG_BLOCK, pindex->GetBlockHash()));
uint32_t nFetchFlags = GetFetchFlags(pfrom, pindex->pprev, chainparams.GetConsensus());
vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash()));
MarkBlockAsInFlight(pfrom->GetId(), pindex->GetBlockHash(), chainparams.GetConsensus(), pindex);
LogPrint("net", "Requesting block %s from peer=%d\n",
pindex->GetBlockHash().ToString(), pfrom->id);
@ -6598,11 +6623,14 @@ bool SendMessages(CNode* pto)
NodeId staller = -1;
FindNextBlocksToDownload(pto->GetId(), MAX_BLOCKS_IN_TRANSIT_PER_PEER - state.nBlocksInFlight, vToDownload, staller);
BOOST_FOREACH(CBlockIndex *pindex, vToDownload) {
vGetData.push_back(CInv(MSG_BLOCK, pindex->GetBlockHash()));
if (State(pto->GetId())->fHaveWitness || !IsWitnessEnabled(pindex->pprev, consensusParams)) {
uint32_t nFetchFlags = GetFetchFlags(pto, pindex->pprev, consensusParams);
vGetData.push_back(CInv(MSG_BLOCK | nFetchFlags, pindex->GetBlockHash()));
MarkBlockAsInFlight(pto->GetId(), pindex->GetBlockHash(), consensusParams, pindex);
LogPrint("net", "Requesting block %s (%d) peer=%d\n", pindex->GetBlockHash().ToString(),
pindex->nHeight, pto->id);
}
}
if (state.nBlocksInFlight == 0 && staller != -1) {
if (State(staller)->nStallingSince == 0) {
State(staller)->nStallingSince = nNow;

6
src/net.cpp
View file

@ -72,7 +72,7 @@ namespace {
const static std::string NET_MESSAGE_COMMAND_OTHER = "*other*";
/** Services this node implementation cares about */
static const ServiceFlags nRelevantServices = NODE_NETWORK;
ServiceFlags nRelevantServices = NODE_NETWORK;
//
// Global state variables
@ -1676,6 +1676,10 @@ void ThreadOpenConnections()
if (nANow - addr.nLastTry < 600 && nTries < 30)
continue;
// only consider nodes missing relevant services after 40 failed attemps
if ((addr.nServices & nRelevantServices) != nRelevantServices && nTries < 40)
continue;
// do not allow non-default ports, unless after 50 invalid addresses selected already
if (addr.GetPort() != Params().GetDefaultPort() && nTries < 50)
continue;

1
src/net.h
View file

@ -156,6 +156,7 @@ CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
extern bool fDiscover;
extern bool fListen;
extern ServiceFlags nLocalServices;
extern ServiceFlags nRelevantServices;
extern bool fRelayTxes;
extern uint64_t nLocalHostNonce;
extern CAddrMan addrman;

3
src/protocol.h
View file

@ -264,6 +264,9 @@ enum ServiceFlags : uint64_t {
// Bitcoin Core nodes used to support this by default, without advertising this bit,
// but no longer do as of protocol version 70011 (= NO_BLOOM_VERSION)
NODE_BLOOM = (1 << 2),
// Indicates that a node can be asked for blocks and transactions including
// witness data.
NODE_WITNESS = (1 << 3),
// Bits 24-31 are reserved for temporary experiments. Just pick a bit that
// isn't getting used, or one not being used much, and notify the

3
src/qt/guiutil.cpp
View file

@ -909,6 +909,9 @@ QString formatServicesStr(quint64 mask)
case NODE_BLOOM:
strList.append("BLOOM");
break;
case NODE_WITNESS:
strList.append("WITNESS");
break;
default:
strList.append(QString("%1[%2]").arg("UNKNOWN").arg(check));
}