Replace watchdogs with ping (#1491)

* Add hassentinelping to governanceinfo

* sentinelping rpc call

* additional fields in mnp

* sentinel ping implementation

* change sentinel state to byte in mnp

* use adjusted time in sentinel ping

* update nTimeLastWatchdogVote if sentinel ping is actual

* remove unused fields

* bump protocol to 70207

* Fix small issues

 - fix the error message text in CActivbeMasternodeUpdateSentinelPing;
 - add empty string before public: in CActiveMasternode class declaration;
 - rename field sentinelPing in CMasternodePing to sentinelIsActual and change $
 - decrease sentinelVersion field size to uint16_t;

* revert proto bump for MIN_... consts

* revert changes in getgovernanceinfo

* Update mn vote time for remote masternodes

 - call UpdateWatchdogVoteTime in CMasternodeMan::ProcessMessage
 - deserialize masternodeping from the previous version archive without exception
 - add ability to set time in UpdateWatchdogVoteTime
 - set nTimeLastWatchdogVote to masternode ping sigTime if sentinel is actual
 - bump CMasternodeMan::SERIALIZATION_VERSION_STRING

* remove mn state checks and add correct rpc param convertion

* fix var names

* Helper class for version in string and integer form

* String version in sentinel ping

Version format is "x.x.x"

* test for bacward compatibility in serialization

* Change VersionInfo class to convert functions

src/activemasternode.cpp

@@ -108,6 +108,9 @@ bool CActiveMasternode::SendMasternodePing()
     }
 
     CMasternodePing mnp(vin);
+    mnp.nSentinelVersion = nSentinelVersion;
+    mnp.fSentinelIsCurrent =
+            (abs(GetAdjustedTime() - nSentinelPingTime) < MASTERNODE_WATCHDOG_MAX_SECONDS);
     if(!mnp.Sign(keyMasternode, pubKeyMasternode)) {
         LogPrintf("CActiveMasternode::SendMasternodePing -- ERROR: Couldn't sign Masternode Ping\n");
         return false;
@@ -127,6 +130,14 @@ bool CActiveMasternode::SendMasternodePing()
     return true;
 }
 
+bool CActiveMasternode::UpdateSentinelPing(int version)
+{
+    nSentinelVersion = version;
+    nSentinelPingTime = GetAdjustedTime();
+
+    return true;
+}
+
 void CActiveMasternode::ManageStateInitial()
 {
     LogPrint("masternode", "CActiveMasternode::ManageStateInitial -- status = %s, type = %s, pinger enabled = %d\n", GetStatus(), GetTypeString(), fPingerEnabled);

src/activemasternode.h

@@ -40,6 +40,10 @@ private:
     /// Ping Masternode
     bool SendMasternodePing();
 
+    //  sentinel ping data
+    int64_t nSentinelPingTime;
+    uint32_t nSentinelVersion;
+
 public:
     // Keys for the active Masternode
     CPubKey pubKeyMasternode;
@@ -52,6 +56,7 @@ public:
     int nState; // should be one of ACTIVE_MASTERNODE_XXXX
     std::string strNotCapableReason;
 
+
     CActiveMasternode()
         : eType(MASTERNODE_UNKNOWN),
           fPingerEnabled(false),
@@ -69,6 +74,8 @@ public:
     std::string GetStatus() const;
     std::string GetTypeString() const;
 
+    bool UpdateSentinelPing(int version);
+
 private:
     void ManageStateInitial();
     void ManageStateRemote();

src/masternode.cpp

@@ -735,7 +735,9 @@ void CMasternodeBroadcast::Relay()
     RelayInv(inv);
 }
 
-CMasternodePing::CMasternodePing(CTxIn& vinNew)
+CMasternodePing::CMasternodePing(CTxIn& vinNew) :
+    fSentinelIsCurrent(false),
+    nSentinelVersion(0)
 {
     LOCK(cs_main);
     if (!chainActive.Tip() || chainActive.Height() < 12) return;
@@ -751,6 +753,7 @@ bool CMasternodePing::Sign(CKey& keyMasternode, CPubKey& pubKeyMasternode)
     std::string strError;
     std::string strMasterNodeSignMessage;
 
+    // TODO: add sentinel data
     sigTime = GetAdjustedTime();
     std::string strMessage = vin.ToString() + blockHash.ToString() + boost::lexical_cast<std::string>(sigTime);
 
@@ -769,6 +772,7 @@ bool CMasternodePing::Sign(CKey& keyMasternode, CPubKey& pubKeyMasternode)
 
 bool CMasternodePing::CheckSignature(CPubKey& pubKeyMasternode, int &nDos)
 {
+    // TODO: add sentinel data
     std::string strMessage = vin.ToString() + blockHash.ToString() + boost::lexical_cast<std::string>(sigTime);
     std::string strError = "";
     nDos = 0;
@@ -909,10 +913,10 @@ void CMasternode::RemoveGovernanceObject(uint256 nGovernanceObjectHash)
     mapGovernanceObjectsVotedOn.erase(it);
 }
 
-void CMasternode::UpdateWatchdogVoteTime()
+void CMasternode::UpdateWatchdogVoteTime(uint64_t nVoteTime)
 {
     LOCK(cs);
-    nTimeLastWatchdogVote = GetTime();
+    nTimeLastWatchdogVote = (nVoteTime == 0) ? GetTime() : nVoteTime;
 }
 
 /**

src/masternode.h

@@ -23,6 +23,7 @@ static const int MASTERNODE_WATCHDOG_MAX_SECONDS        = 120 * 60;
 static const int MASTERNODE_NEW_START_REQUIRED_SECONDS  = 180 * 60;
 
 static const int MASTERNODE_POSE_BAN_MAX_SCORE          = 5;
+
 //
 // The Masternode Ping Class : Contains a different serialize method for sending pings from masternodes throughout the network
 //
@@ -34,13 +35,17 @@ public:
     uint256 blockHash;
     int64_t sigTime; //mnb message times
     std::vector<unsigned char> vchSig;
+    bool fSentinelIsCurrent; // true if last sentinel ping was actual
+    uint32_t nSentinelVersion; // MSB is always 0, other 3 bits corresponds to x.x.x version scheme
     //removed stop
 
     CMasternodePing() :
         vin(),
         blockHash(),
         sigTime(0),
-        vchSig()
+        vchSig(),
+        fSentinelIsCurrent(false),
+        nSentinelVersion(0)
         {}
 
     CMasternodePing(CTxIn& vinNew);
@@ -53,6 +58,10 @@ public:
         READWRITE(blockHash);
         READWRITE(sigTime);
         READWRITE(vchSig);
+        if(ser_action.ForRead() && (s.size() == 0))
+            return;
+        READWRITE(fSentinelIsCurrent);
+        READWRITE(nSentinelVersion);
     }
 
     void swap(CMasternodePing& first, CMasternodePing& second) // nothrow
@@ -66,6 +75,8 @@ public:
         swap(first.blockHash, second.blockHash);
         swap(first.sigTime, second.sigTime);
         swap(first.vchSig, second.vchSig);
+        swap(first.fSentinelIsCurrent, second.fSentinelIsCurrent);
+        swap(first.nSentinelVersion, second.nSentinelVersion);
     }
 
     uint256 GetHash() const
@@ -318,7 +329,7 @@ public:
 
     void RemoveGovernanceObject(uint256 nGovernanceObjectHash);
 
-    void UpdateWatchdogVoteTime();
+    void UpdateWatchdogVoteTime(uint64_t nVoteTime = 0);
 
     CMasternode& operator=(CMasternode from)
     {

src/masternodeman.cpp

@@ -16,7 +16,7 @@
 /** Masternode manager */
 CMasternodeMan mnodeman;
 
-const std::string CMasternodeMan::SERIALIZATION_VERSION_STRING = "CMasternodeMan-Version-4";
+const std::string CMasternodeMan::SERIALIZATION_VERSION_STRING = "CMasternodeMan-Version-5";
 
 struct CompareLastPaidBlock
 {
@@ -849,6 +849,12 @@ void CMasternodeMan::ProcessMessage(CNode* pfrom, std::string& strCommand, CData
         // see if we have this Masternode
         CMasternode* pmn = mnodeman.Find(mnp.vin);
 
+        // if masternode uses sentinel ping instead of watchdog
+        // we shoud update nTimeLastWatchdogVote here if sentinel
+        // ping flag is actual
+        if(pmn && mnp.fSentinelIsCurrent)
+            pmn->UpdateWatchdogVoteTime(mnp.sigTime);
+
         // too late, new MNANNOUNCE is required
         if(pmn && pmn->IsNewStartRequired()) return;
 
@@ -1642,6 +1648,11 @@ void CMasternodeMan::SetMasternodeLastPing(const CTxIn& vin, const CMasternodePi
         return;
     }
     pMN->lastPing = mnp;
+    // if masternode uses sentinel ping instead of watchdog
+    // we shoud update nTimeLastWatchdogVote here if sentinel
+    // ping flag is actual
+    if(mnp.fSentinelIsCurrent)
+        pMN->UpdateWatchdogVoteTime(mnp.sigTime);
     mapSeenMasternodePing.insert(std::make_pair(mnp.GetHash(), mnp));
 
     CMasternodeBroadcast mnb(*pMN);

src/rpc/governance.cpp

@@ -972,3 +972,4 @@ UniValue getsuperblockbudget(const UniValue& params, bool fHelp)
 
     return strBudget;
 }
+

src/rpc/masternode.cpp

@@ -795,3 +795,23 @@ UniValue masternodebroadcast(const UniValue& params, bool fHelp)
 
     return NullUniValue;
 }
+
+UniValue sentinelping(const UniValue& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1) {
+        throw std::runtime_error(
+            "sentinelping version\n"
+            "\nSentinel ping.\n"
+            "\nArguments:\n"
+            "1. version           (string, required) Sentinel version in the form \"x.x.x\"\n"
+            "\nResult:\n"
+            "state                (boolean) Ping result\n"
+            "\nExamples:\n"
+            + HelpExampleCli("sentinelping", "1.0.2")
+            + HelpExampleRpc("sentinelping", "1.0.2")
+        );
+    }
+
+    activeMasternode.UpdateSentinelPing(StringVersionToInt(params[0].get_str()));
+    return true;
+}

src/rpc/server.cpp

@@ -353,6 +353,7 @@ static const CRPCCommand vRPCCommands[] =
     { "dash",               "mnsync",                 &mnsync,                 true  },
     { "dash",               "spork",                  &spork,                  true  },
     { "dash",               "getpoolinfo",            &getpoolinfo,            true  },
+    { "dash",               "sentinelping",           &sentinelping,           true  },
 #ifdef ENABLE_WALLET
     { "dash",               "privatesend",            &privatesend,            false },
 

src/rpc/server.h

@@ -296,6 +296,7 @@ extern UniValue getchaintips(const UniValue& params, bool fHelp);
 extern UniValue invalidateblock(const UniValue& params, bool fHelp);
 extern UniValue reconsiderblock(const UniValue& params, bool fHelp);
 extern UniValue getspentinfo(const UniValue& params, bool fHelp);
+extern UniValue sentinelping(const UniValue& params, bool fHelp);
 
 bool StartRPC();
 void InterruptRPC();

src/test/rpc_tests.cpp

@@ -307,4 +307,11 @@ BOOST_AUTO_TEST_CASE(rpc_ban)
     BOOST_CHECK_EQUAL(adr.get_str(), "2001:4d48:ac57:400:cacf:e9ff:fe1d:9c63/128");
 }
 
+BOOST_AUTO_TEST_CASE(rpc_sentinel_ping)
+{
+    BOOST_CHECK_NO_THROW(CallRPC("sentinelping 1.0.2"));
+    BOOST_CHECK_THROW(CallRPC("sentinelping"), runtime_error);
+    BOOST_CHECK_THROW(CallRPC("sentinelping 2"), bad_cast);
+}
+
 BOOST_AUTO_TEST_SUITE_END()

src/test/serialize_tests.cpp

@@ -276,4 +276,53 @@ BOOST_AUTO_TEST_CASE(insert_delete)
     BOOST_CHECK_EQUAL(ss.size(), 0);
 }
 
+// Change struct size and check if it can be deserialized
+// from old version archive and vice versa
+struct old_version
+{
+    int field1;
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        READWRITE(field1);
+    }
+};\
+struct new_version
+{
+    int field1;
+    int field2;
+
+    ADD_SERIALIZE_METHODS;
+
+    template <typename Stream, typename Operation>
+    inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
+        READWRITE(field1);
+        if(ser_action.ForRead() && (s.size() == 0))
+        {
+            field2 = 0;
+            return;
+        }
+        READWRITE(field2);
+    }
+};
+
+BOOST_AUTO_TEST_CASE(check_backward_compatibility)
+{
+    CDataStream ss(SER_DISK, 0);
+    old_version old_src({5});
+    ss << old_src;
+    new_version new_dest({6, 7});
+    BOOST_REQUIRE_NO_THROW(ss >> new_dest);
+    BOOST_REQUIRE(old_src.field1 == new_dest.field1);
+    BOOST_REQUIRE(ss.size() == 0);
+
+    new_version new_src({6, 7});
+    ss << new_src;
+    old_version old_dest({5});
+    BOOST_REQUIRE_NO_THROW(ss >> old_dest);
+    BOOST_REQUIRE(new_src.field1 == old_dest.field1);
+}
+
 BOOST_AUTO_TEST_SUITE_END()

src/test/util_tests.cpp

@@ -489,4 +489,19 @@ BOOST_AUTO_TEST_CASE(test_ParseFixedPoint)
     BOOST_CHECK(!ParseFixedPoint("1.", 8, &amount));
 }
 
+BOOST_AUTO_TEST_CASE(version_info_helper)
+{
+    BOOST_CHECK(StringVersionToInt("1.1.1") == 0x010101);
+    BOOST_CHECK(IntVersionToString(0x010101) == "1.1.1");
+
+    BOOST_CHECK_THROW(StringVersionToInt("1.1.hgdghfgf"), bad_cast);
+    BOOST_CHECK_THROW(StringVersionToInt("1.1"), bad_cast);
+    BOOST_CHECK_THROW(StringVersionToInt("1.1.1f"), bad_cast);
+    BOOST_CHECK_THROW(StringVersionToInt("1.1.1000"), bad_cast);
+    BOOST_CHECK_THROW(StringVersionToInt("10"), bad_cast);
+    BOOST_CHECK_THROW(StringVersionToInt("1.1.1.1"), bad_cast);
+    BOOST_CHECK_THROW(IntVersionToString(0x01010101), bad_cast);
+    BOOST_CHECK_THROW(IntVersionToString(0), bad_cast);
+}
+
 BOOST_AUTO_TEST_SUITE_END()

src/util.cpp

@@ -78,6 +78,8 @@
 #include <boost/algorithm/string/case_conv.hpp> // for to_lower()
 #include <boost/algorithm/string/join.hpp>
 #include <boost/algorithm/string/predicate.hpp> // for startswith() and endswith()
+#include <boost/algorithm/string/split.hpp>
+#include <boost/algorithm/string/classification.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
 #include <boost/foreach.hpp>
@@ -952,3 +954,39 @@ int GetNumCores()
 #endif
 }
 
+
+uint32_t StringVersionToInt(const std::string& strVersion)
+{
+    std::vector<std::string> tokens;
+    boost::split(tokens, strVersion, boost::is_any_of("."));
+    if(tokens.size() != 3)
+        throw std::bad_cast();
+    uint32_t nVersion = 0;
+    for(unsigned idx = 0; idx < 3; idx++)
+    {
+        if(tokens[idx].length() == 0)
+            throw std::bad_cast();
+        uint32_t value = boost::lexical_cast<uint32_t>(tokens[idx]);
+        if(value > 255)
+            throw std::bad_cast();
+        nVersion <<= 8;
+        nVersion |= value;
+    }
+    return nVersion;
+}
+
+std::string IntVersionToString(uint32_t nVersion)
+{
+    if((nVersion >> 24) > 0) // MSB is always 0
+        throw std::bad_cast();
+    if(nVersion == 0)
+        throw std::bad_cast();
+    std::array<std::string, 3> tokens;
+    for(unsigned idx = 0; idx < 3; idx++)
+    {
+        unsigned shift = (2 - idx) * 8;
+        uint32_t byteValue = (nVersion >> shift) & 0xff;
+        tokens[idx] = boost::lexical_cast<std::string>(byteValue);
+    }
+    return boost::join(tokens, ".");
+}

src/util.h

@@ -271,4 +271,23 @@ template <typename Callable> void TraceThread(const char* name,  Callable func)
     }
 }
 
+
+/**
+ * @brief Converts version strings to 4-byte unsigned integer
+ * @param strVersion version in "x.x.x" format (decimal digits only)
+ * @return 4-byte unsigned integer, most significant byte is always 0
+ * Throws std::bad_cast if format doesn\t match.
+ */
+uint32_t StringVersionToInt(const std::string& strVersion);
+
+
+/**
+ * @brief Converts version as 4-byte unsigned integer to string
+ * @param nVersion 4-byte unsigned integer, most significant byte is always 0
+ * @return version string in "x.x.x" format (last 3 bytes as version parts)
+ * Throws std::bad_cast if format doesn\t match.
+ */
+std::string IntVersionToString(uint32_t nVersion);
+
+
 #endif // BITCOIN_UTIL_H

src/version.h

@@ -10,7 +10,7 @@
  * network protocol versioning
  */
 
-static const int PROTOCOL_VERSION = 70206;
+static const int PROTOCOL_VERSION = 70207;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;