From 84c3fb07b0b8199c7f85c5de280e7100bad0786f Mon Sep 17 00:00:00 2001 From: Jaromil Date: Sat, 23 Apr 2011 11:49:47 +0200 Subject: directory re-organization (keeps the old build system) there is no internal modification of any file in this commit files are moved into directories according to established standards in sourcecode distribution; these directories contain: src - Files that are used in constructing the executable binaries, but are not installed. doc - Files in HTML and text format that document usage, quirks of the implementation, and contributor checklists. locale - Files that contain human language translation of strings used in the program contrib - Files contributed from distributions or other third party implementing scripts and auxiliary programs --- src/net.h | 1055 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1055 insertions(+) create mode 100644 src/net.h (limited to 'src/net.h') diff --git a/src/net.h b/src/net.h new file mode 100644 index 0000000000..b3bd74da47 --- /dev/null +++ b/src/net.h @@ -0,0 +1,1055 @@ +// Copyright (c) 2009-2010 Satoshi Nakamoto +// Distributed under the MIT/X11 software license, see the accompanying +// file license.txt or http://www.opensource.org/licenses/mit-license.php. + +class CMessageHeader; +class CAddress; +class CInv; +class CRequestTracker; +class CNode; +class CBlockIndex; +extern int nBestHeight; + + + +inline unsigned short GetDefaultPort() { return fTestNet ? htons(18333) : htons(8333); } +static const unsigned int PUBLISH_HOPS = 5; +enum +{ + NODE_NETWORK = (1 << 0), +}; + + + + +bool ConnectSocket(const CAddress& addrConnect, SOCKET& hSocketRet); +bool GetMyExternalIP(unsigned int& ipRet); +bool AddAddress(CAddress addr, int64 nTimePenalty=0); +void AddressCurrentlyConnected(const CAddress& addr); +CNode* FindNode(unsigned int ip); +CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0); +void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1); +bool AnySubscribed(unsigned int nChannel); +void MapPort(bool fMapPort); +void DNSAddressSeed(); +bool BindListenPort(string& strError=REF(string())); +void StartNode(void* parg); +bool StopNode(); + + + + + + + + +// +// Message header +// (4) message start +// (12) command +// (4) size +// (4) checksum + +extern char pchMessageStart[4]; + +class CMessageHeader +{ +public: + enum { COMMAND_SIZE=12 }; + char pchMessageStart[sizeof(::pchMessageStart)]; + char pchCommand[COMMAND_SIZE]; + unsigned int nMessageSize; + unsigned int nChecksum; + + CMessageHeader() + { + memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)); + memset(pchCommand, 0, sizeof(pchCommand)); + pchCommand[1] = 1; + nMessageSize = -1; + nChecksum = 0; + } + + CMessageHeader(const char* pszCommand, unsigned int nMessageSizeIn) + { + memcpy(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)); + strncpy(pchCommand, pszCommand, COMMAND_SIZE); + nMessageSize = nMessageSizeIn; + nChecksum = 0; + } + + IMPLEMENT_SERIALIZE + ( + READWRITE(FLATDATA(pchMessageStart)); + READWRITE(FLATDATA(pchCommand)); + READWRITE(nMessageSize); + if (nVersion >= 209) + READWRITE(nChecksum); + ) + + string GetCommand() + { + if (pchCommand[COMMAND_SIZE-1] == 0) + return string(pchCommand, pchCommand + strlen(pchCommand)); + else + return string(pchCommand, pchCommand + COMMAND_SIZE); + } + + bool IsValid() + { + // Check start string + if (memcmp(pchMessageStart, ::pchMessageStart, sizeof(pchMessageStart)) != 0) + return false; + + // Check the command string for errors + for (char* p1 = pchCommand; p1 < pchCommand + COMMAND_SIZE; p1++) + { + if (*p1 == 0) + { + // Must be all zeros after the first zero + for (; p1 < pchCommand + COMMAND_SIZE; p1++) + if (*p1 != 0) + return false; + } + else if (*p1 < ' ' || *p1 > 0x7E) + return false; + } + + // Message size + if (nMessageSize > MAX_SIZE) + { + printf("CMessageHeader::IsValid() : (%s, %u bytes) nMessageSize > MAX_SIZE\n", GetCommand().c_str(), nMessageSize); + return false; + } + + return true; + } +}; + + + + + + +static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff }; + +class CAddress +{ +public: + uint64 nServices; + unsigned char pchReserved[12]; + unsigned int ip; + unsigned short port; + + // disk and network only + unsigned int nTime; + + // memory only + unsigned int nLastTry; + + CAddress() + { + Init(); + } + + CAddress(unsigned int ipIn, unsigned short portIn=0, uint64 nServicesIn=NODE_NETWORK) + { + Init(); + ip = ipIn; + port = (portIn == 0 ? GetDefaultPort() : portIn); + nServices = nServicesIn; + } + + explicit CAddress(const struct sockaddr_in& sockaddr, uint64 nServicesIn=NODE_NETWORK) + { + Init(); + ip = sockaddr.sin_addr.s_addr; + port = sockaddr.sin_port; + nServices = nServicesIn; + } + + explicit CAddress(const char* pszIn, uint64 nServicesIn=NODE_NETWORK) + { + Init(); + SetAddress(pszIn); + nServices = nServicesIn; + } + + explicit CAddress(string strIn, uint64 nServicesIn=NODE_NETWORK) + { + Init(); + SetAddress(strIn.c_str()); + nServices = nServicesIn; + } + + void Init() + { + nServices = NODE_NETWORK; + memcpy(pchReserved, pchIPv4, sizeof(pchReserved)); + ip = INADDR_NONE; + port = GetDefaultPort(); + nTime = 100000000; + nLastTry = 0; + } + + bool SetAddress(const char* pszIn) + { + ip = INADDR_NONE; + port = GetDefaultPort(); + char psz[100]; + strlcpy(psz, pszIn, sizeof(psz)); + unsigned int a=0, b=0, c=0, d=0, e=0; + if (sscanf(psz, "%u.%u.%u.%u:%u", &a, &b, &c, &d, &e) < 4) + return false; + char* pszPort = strchr(psz, ':'); + if (pszPort) + { + *pszPort++ = '\0'; + port = htons(atoi(pszPort)); + if (atoi(pszPort) < 0 || atoi(pszPort) > USHRT_MAX) + port = htons(USHRT_MAX); + } + ip = inet_addr(psz); + return IsValid(); + } + + bool SetAddress(string strIn) + { + return SetAddress(strIn.c_str()); + } + + IMPLEMENT_SERIALIZE + ( + if (fRead) + const_cast(this)->Init(); + if (nType & SER_DISK) + READWRITE(nVersion); + if ((nType & SER_DISK) || (nVersion >= 31402 && !(nType & SER_GETHASH))) + READWRITE(nTime); + READWRITE(nServices); + READWRITE(FLATDATA(pchReserved)); // for IPv6 + READWRITE(ip); + READWRITE(port); + ) + + friend inline bool operator==(const CAddress& a, const CAddress& b) + { + return (memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved)) == 0 && + a.ip == b.ip && + a.port == b.port); + } + + friend inline bool operator!=(const CAddress& a, const CAddress& b) + { + return (!(a == b)); + } + + friend inline bool operator<(const CAddress& a, const CAddress& b) + { + int ret = memcmp(a.pchReserved, b.pchReserved, sizeof(a.pchReserved)); + if (ret < 0) + return true; + else if (ret == 0) + { + if (ntohl(a.ip) < ntohl(b.ip)) + return true; + else if (a.ip == b.ip) + return ntohs(a.port) < ntohs(b.port); + } + return false; + } + + vector GetKey() const + { + CDataStream ss; + ss.reserve(18); + ss << FLATDATA(pchReserved) << ip << port; + + #if defined(_MSC_VER) && _MSC_VER < 1300 + return vector((unsigned char*)&ss.begin()[0], (unsigned char*)&ss.end()[0]); + #else + return vector(ss.begin(), ss.end()); + #endif + } + + struct sockaddr_in GetSockAddr() const + { + struct sockaddr_in sockaddr; + memset(&sockaddr, 0, sizeof(sockaddr)); + sockaddr.sin_family = AF_INET; + sockaddr.sin_addr.s_addr = ip; + sockaddr.sin_port = port; + return sockaddr; + } + + bool IsIPv4() const + { + return (memcmp(pchReserved, pchIPv4, sizeof(pchIPv4)) == 0); + } + + bool IsRoutable() const + { + return IsValid() && + !(GetByte(3) == 10 || + (GetByte(3) == 192 && GetByte(2) == 168) || + GetByte(3) == 127 || + GetByte(3) == 0); + } + + bool IsValid() const + { + // Clean up 3-byte shifted addresses caused by garbage in size field + // of addr messages from versions before 0.2.9 checksum. + // Two consecutive addr messages look like this: + // header20 vectorlen3 addr26 addr26 addr26 header20 vectorlen3 addr26 addr26 addr26... + // so if the first length field is garbled, it reads the second batch + // of addr misaligned by 3 bytes. + if (memcmp(pchReserved, pchIPv4+3, sizeof(pchIPv4)-3) == 0) + return false; + + return (ip != 0 && ip != INADDR_NONE && port != htons(USHRT_MAX)); + } + + unsigned char GetByte(int n) const + { + return ((unsigned char*)&ip)[3-n]; + } + + string ToStringIPPort() const + { + return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port)); + } + + string ToStringIP() const + { + return strprintf("%u.%u.%u.%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0)); + } + + string ToStringPort() const + { + return strprintf("%u", ntohs(port)); + } + + string ToStringLog() const + { + return ""; + } + + string ToString() const + { + return strprintf("%u.%u.%u.%u:%u", GetByte(3), GetByte(2), GetByte(1), GetByte(0), ntohs(port)); + } + + void print() const + { + printf("CAddress(%s)\n", ToString().c_str()); + } +}; + + + + + + + +enum +{ + MSG_TX = 1, + MSG_BLOCK, +}; + +static const char* ppszTypeName[] = +{ + "ERROR", + "tx", + "block", +}; + +class CInv +{ +public: + int type; + uint256 hash; + + CInv() + { + type = 0; + hash = 0; + } + + CInv(int typeIn, const uint256& hashIn) + { + type = typeIn; + hash = hashIn; + } + + CInv(const string& strType, const uint256& hashIn) + { + int i; + for (i = 1; i < ARRAYLEN(ppszTypeName); i++) + { + if (strType == ppszTypeName[i]) + { + type = i; + break; + } + } + if (i == ARRAYLEN(ppszTypeName)) + throw std::out_of_range(strprintf("CInv::CInv(string, uint256) : unknown type '%s'", strType.c_str())); + hash = hashIn; + } + + IMPLEMENT_SERIALIZE + ( + READWRITE(type); + READWRITE(hash); + ) + + friend inline bool operator<(const CInv& a, const CInv& b) + { + return (a.type < b.type || (a.type == b.type && a.hash < b.hash)); + } + + bool IsKnownType() const + { + return (type >= 1 && type < ARRAYLEN(ppszTypeName)); + } + + const char* GetCommand() const + { + if (!IsKnownType()) + throw std::out_of_range(strprintf("CInv::GetCommand() : type=%d unknown type", type)); + return ppszTypeName[type]; + } + + string ToString() const + { + return strprintf("%s %s", GetCommand(), hash.ToString().substr(0,20).c_str()); + } + + void print() const + { + printf("CInv(%s)\n", ToString().c_str()); + } +}; + + + + + +class CRequestTracker +{ +public: + void (*fn)(void*, CDataStream&); + void* param1; + + explicit CRequestTracker(void (*fnIn)(void*, CDataStream&)=NULL, void* param1In=NULL) + { + fn = fnIn; + param1 = param1In; + } + + bool IsNull() + { + return fn == NULL; + } +}; + + + + + +extern bool fClient; +extern uint64 nLocalServices; +extern CAddress addrLocalHost; +extern CNode* pnodeLocalHost; +extern uint64 nLocalHostNonce; +extern array vnThreadsRunning; +extern SOCKET hListenSocket; + +extern vector vNodes; +extern CCriticalSection cs_vNodes; +extern map, CAddress> mapAddresses; +extern CCriticalSection cs_mapAddresses; +extern map mapRelay; +extern deque > vRelayExpiration; +extern CCriticalSection cs_mapRelay; +extern map mapAlreadyAskedFor; + +// Settings +extern int fUseProxy; +extern CAddress addrProxy; + + + + + + +class CNode +{ +public: + // socket + uint64 nServices; + SOCKET hSocket; + CDataStream vSend; + CDataStream vRecv; + CCriticalSection cs_vSend; + CCriticalSection cs_vRecv; + int64 nLastSend; + int64 nLastRecv; + int64 nLastSendEmpty; + int64 nTimeConnected; + unsigned int nHeaderStart; + unsigned int nMessageStart; + CAddress addr; + int nVersion; + string strSubVer; + bool fClient; + bool fInbound; + bool fNetworkNode; + bool fSuccessfullyConnected; + bool fDisconnect; +protected: + int nRefCount; +public: + int64 nReleaseTime; + map mapRequests; + CCriticalSection cs_mapRequests; + uint256 hashContinue; + CBlockIndex* pindexLastGetBlocksBegin; + uint256 hashLastGetBlocksEnd; + int nStartingHeight; + + // flood relay + vector vAddrToSend; + set setAddrKnown; + bool fGetAddr; + set setKnown; + + // inventory based relay + set setInventoryKnown; + vector vInventoryToSend; + CCriticalSection cs_inventory; + multimap mapAskFor; + + // publish and subscription + vector vfSubscribe; + + + CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false) + { + nServices = 0; + hSocket = hSocketIn; + vSend.SetType(SER_NETWORK); + vSend.SetVersion(0); + vRecv.SetType(SER_NETWORK); + vRecv.SetVersion(0); + // Version 0.2 obsoletes 20 Feb 2012 + if (GetTime() > 1329696000) + { + vSend.SetVersion(209); + vRecv.SetVersion(209); + } + nLastSend = 0; + nLastRecv = 0; + nLastSendEmpty = GetTime(); + nTimeConnected = GetTime(); + nHeaderStart = -1; + nMessageStart = -1; + addr = addrIn; + nVersion = 0; + strSubVer = ""; + fClient = false; // set by version message + fInbound = fInboundIn; + fNetworkNode = false; + fSuccessfullyConnected = false; + fDisconnect = false; + nRefCount = 0; + nReleaseTime = 0; + hashContinue = 0; + pindexLastGetBlocksBegin = 0; + hashLastGetBlocksEnd = 0; + nStartingHeight = -1; + fGetAddr = false; + vfSubscribe.assign(256, false); + + // Be shy and don't send version until we hear + if (!fInbound) + PushVersion(); + } + + ~CNode() + { + if (hSocket != INVALID_SOCKET) + { + closesocket(hSocket); + hSocket = INVALID_SOCKET; + } + } + +private: + CNode(const CNode&); + void operator=(const CNode&); +public: + + + int GetRefCount() + { + return max(nRefCount, 0) + (GetTime() < nReleaseTime ? 1 : 0); + } + + CNode* AddRef(int64 nTimeout=0) + { + if (nTimeout != 0) + nReleaseTime = max(nReleaseTime, GetTime() + nTimeout); + else + nRefCount++; + return this; + } + + void Release() + { + nRefCount--; + } + + + + void AddAddressKnown(const CAddress& addr) + { + setAddrKnown.insert(addr); + } + + void PushAddress(const CAddress& addr) + { + // Known checking here is only to save space from duplicates. + // SendMessages will filter it again for knowns that were added + // after addresses were pushed. + if (addr.IsValid() && !setAddrKnown.count(addr)) + vAddrToSend.push_back(addr); + } + + + void AddInventoryKnown(const CInv& inv) + { + CRITICAL_BLOCK(cs_inventory) + setInventoryKnown.insert(inv); + } + + void PushInventory(const CInv& inv) + { + CRITICAL_BLOCK(cs_inventory) + if (!setInventoryKnown.count(inv)) + vInventoryToSend.push_back(inv); + } + + void AskFor(const CInv& inv) + { + // We're using mapAskFor as a priority queue, + // the key is the earliest time the request can be sent + int64& nRequestTime = mapAlreadyAskedFor[inv]; + printf("askfor %s %"PRI64d"\n", inv.ToString().c_str(), nRequestTime); + + // Make sure not to reuse time indexes to keep things in the same order + int64 nNow = (GetTime() - 1) * 1000000; + static int64 nLastTime; + nLastTime = nNow = max(nNow, ++nLastTime); + + // Each retry is 2 minutes after the last + nRequestTime = max(nRequestTime + 2 * 60 * 1000000, nNow); + mapAskFor.insert(make_pair(nRequestTime, inv)); + } + + + + void BeginMessage(const char* pszCommand) + { + cs_vSend.Enter(); + if (nHeaderStart != -1) + AbortMessage(); + nHeaderStart = vSend.size(); + vSend << CMessageHeader(pszCommand, 0); + nMessageStart = vSend.size(); + if (fDebug) + printf("%s ", DateTimeStrFormat("%x %H:%M:%S", GetTime()).c_str()); + printf("sending: %s ", pszCommand); + } + + void AbortMessage() + { + if (nHeaderStart == -1) + return; + vSend.resize(nHeaderStart); + nHeaderStart = -1; + nMessageStart = -1; + cs_vSend.Leave(); + printf("(aborted)\n"); + } + + void EndMessage() + { + if (mapArgs.count("-dropmessagestest") && GetRand(atoi(mapArgs["-dropmessagestest"])) == 0) + { + printf("dropmessages DROPPING SEND MESSAGE\n"); + AbortMessage(); + return; + } + + if (nHeaderStart == -1) + return; + + // Set the size + unsigned int nSize = vSend.size() - nMessageStart; + memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nMessageSize), &nSize, sizeof(nSize)); + + // Set the checksum + if (vSend.GetVersion() >= 209) + { + uint256 hash = Hash(vSend.begin() + nMessageStart, vSend.end()); + unsigned int nChecksum = 0; + memcpy(&nChecksum, &hash, sizeof(nChecksum)); + assert(nMessageStart - nHeaderStart >= offsetof(CMessageHeader, nChecksum) + sizeof(nChecksum)); + memcpy((char*)&vSend[nHeaderStart] + offsetof(CMessageHeader, nChecksum), &nChecksum, sizeof(nChecksum)); + } + + printf("(%d bytes) ", nSize); + printf("\n"); + + nHeaderStart = -1; + nMessageStart = -1; + cs_vSend.Leave(); + } + + void EndMessageAbortIfEmpty() + { + if (nHeaderStart == -1) + return; + int nSize = vSend.size() - nMessageStart; + if (nSize > 0) + EndMessage(); + else + AbortMessage(); + } + + + + void PushVersion() + { + /// when NTP implemented, change to just nTime = GetAdjustedTime() + int64 nTime = (fInbound ? GetAdjustedTime() : GetTime()); + CAddress addrYou = (fUseProxy ? CAddress("0.0.0.0") : addr); + CAddress addrMe = (fUseProxy ? CAddress("0.0.0.0") : addrLocalHost); + RAND_bytes((unsigned char*)&nLocalHostNonce, sizeof(nLocalHostNonce)); + PushMessage("version", VERSION, nLocalServices, nTime, addrYou, addrMe, + nLocalHostNonce, string(pszSubVer), nBestHeight); + } + + + + + void PushMessage(const char* pszCommand) + { + try + { + BeginMessage(pszCommand); + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1) + { + try + { + BeginMessage(pszCommand); + vSend << a1; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4 << a5; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4 << a5 << a6; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + template + void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9) + { + try + { + BeginMessage(pszCommand); + vSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9; + EndMessage(); + } + catch (...) + { + AbortMessage(); + throw; + } + } + + + void PushRequest(const char* pszCommand, + void (*fn)(void*, CDataStream&), void* param1) + { + uint256 hashReply; + RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply)); + + CRITICAL_BLOCK(cs_mapRequests) + mapRequests[hashReply] = CRequestTracker(fn, param1); + + PushMessage(pszCommand, hashReply); + } + + template + void PushRequest(const char* pszCommand, const T1& a1, + void (*fn)(void*, CDataStream&), void* param1) + { + uint256 hashReply; + RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply)); + + CRITICAL_BLOCK(cs_mapRequests) + mapRequests[hashReply] = CRequestTracker(fn, param1); + + PushMessage(pszCommand, hashReply, a1); + } + + template + void PushRequest(const char* pszCommand, const T1& a1, const T2& a2, + void (*fn)(void*, CDataStream&), void* param1) + { + uint256 hashReply; + RAND_bytes((unsigned char*)&hashReply, sizeof(hashReply)); + + CRITICAL_BLOCK(cs_mapRequests) + mapRequests[hashReply] = CRequestTracker(fn, param1); + + PushMessage(pszCommand, hashReply, a1, a2); + } + + + + void PushGetBlocks(CBlockIndex* pindexBegin, uint256 hashEnd); + bool IsSubscribed(unsigned int nChannel); + void Subscribe(unsigned int nChannel, unsigned int nHops=0); + void CancelSubscribe(unsigned int nChannel); + void CloseSocketDisconnect(); + void Cleanup(); +}; + + + + + + + + + + +inline void RelayInventory(const CInv& inv) +{ + // Put on lists to offer to the other nodes + CRITICAL_BLOCK(cs_vNodes) + foreach(CNode* pnode, vNodes) + pnode->PushInventory(inv); +} + +template +void RelayMessage(const CInv& inv, const T& a) +{ + CDataStream ss(SER_NETWORK); + ss.reserve(10000); + ss << a; + RelayMessage(inv, ss); +} + +template<> +inline void RelayMessage<>(const CInv& inv, const CDataStream& ss) +{ + CRITICAL_BLOCK(cs_mapRelay) + { + // Expire old relay messages + while (!vRelayExpiration.empty() && vRelayExpiration.front().first < GetTime()) + { + mapRelay.erase(vRelayExpiration.front().second); + vRelayExpiration.pop_front(); + } + + // Save original serialized message so newer versions are preserved + mapRelay[inv] = ss; + vRelayExpiration.push_back(make_pair(GetTime() + 15 * 60, inv)); + } + + RelayInventory(inv); +} + + + + + + + + +// +// Templates for the publish and subscription system. +// The object being published as T& obj needs to have: +// a set setSources member +// specializations of AdvertInsert and AdvertErase +// Currently implemented for CTable and CProduct. +// + +template +void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj) +{ + // Add to sources + obj.setSources.insert(pfrom->addr.ip); + + if (!AdvertInsert(obj)) + return; + + // Relay + CRITICAL_BLOCK(cs_vNodes) + foreach(CNode* pnode, vNodes) + if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel))) + pnode->PushMessage("publish", nChannel, nHops, obj); +} + +template +void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj) +{ + uint256 hash = obj.GetHash(); + + CRITICAL_BLOCK(cs_vNodes) + foreach(CNode* pnode, vNodes) + if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel))) + pnode->PushMessage("pub-cancel", nChannel, nHops, hash); + + AdvertErase(obj); +} + +template +void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj) +{ + // Remove a source + obj.setSources.erase(pfrom->addr.ip); + + // If no longer supported by any sources, cancel it + if (obj.setSources.empty()) + AdvertStopPublish(pfrom, nChannel, nHops, obj); +} -- cgit v1.2.3