Merge #8391: Consensus: Remove ISM

122786d Consensus: Remove ISM (NicolasDorier)

4 files changed, 40 insertions, 65 deletions

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index d6032440e3..ea6e3aada2 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -71,11 +71,10 @@ public:
     CMainParams() {
         strNetworkID = "main";
         consensus.nSubsidyHalvingInterval = 210000;
-        consensus.nMajorityEnforceBlockUpgrade = 750;
-        consensus.nMajorityRejectBlockOutdated = 950;
-        consensus.nMajorityWindow = 1000;
         consensus.BIP34Height = 227931;
         consensus.BIP34Hash = uint256S("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8");
+        consensus.BIP65Height = 388381; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
+        consensus.BIP66Height = 363725; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
         consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 10 * 60;
@@ -167,11 +166,10 @@ public:
     CTestNetParams() {
         strNetworkID = "test";
         consensus.nSubsidyHalvingInterval = 210000;
-        consensus.nMajorityEnforceBlockUpgrade = 51;
-        consensus.nMajorityRejectBlockOutdated = 75;
-        consensus.nMajorityWindow = 100;
         consensus.BIP34Height = 21111;
         consensus.BIP34Hash = uint256S("0x0000000023b3a96d3484e5abb3755c413e7d41500f8e2a5c3f0dd01299cd8ef8");
+        consensus.BIP65Height = 581885; // 00000000007f6655f22f98e72ed80d8b06dc761d5da09df0fa1dc4be4f861eb6
+        consensus.BIP66Height = 330776; // 000000002104c8c45e99a8853285a3b592602a3ccde2b832481da85e9e4ba182
         consensus.powLimit = uint256S("00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 10 * 60;
@@ -247,11 +245,10 @@ public:
     CRegTestParams() {
         strNetworkID = "regtest";
         consensus.nSubsidyHalvingInterval = 150;
-        consensus.nMajorityEnforceBlockUpgrade = 750;
-        consensus.nMajorityRejectBlockOutdated = 950;
-        consensus.nMajorityWindow = 1000;
-        consensus.BIP34Height = -1; // BIP34 has not necessarily activated on regtest
+        consensus.BIP34Height = 100000000; // BIP34 has not activated on regtest (far in the future so block v1 are not rejected in tests)
         consensus.BIP34Hash = uint256();
+        consensus.BIP65Height = 1351; // BIP65 activated on regtest (Used in rpc activation tests)
+        consensus.BIP66Height = 1251; // BIP66 activated on regtest (Used in rpc activation tests)
         consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
         consensus.nPowTargetSpacing = 10 * 60;
diff --git a/src/consensus/params.h b/src/consensus/params.h
index 822ec87d69..5b2f49184f 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -39,13 +39,13 @@ struct BIP9Deployment {
 struct Params {
     uint256 hashGenesisBlock;
     int nSubsidyHalvingInterval;
-    /** Used to check majorities for block version upgrade */
-    int nMajorityEnforceBlockUpgrade;
-    int nMajorityRejectBlockOutdated;
-    int nMajorityWindow;
     /** Block height and hash at which BIP34 becomes active */
     int BIP34Height;
     uint256 BIP34Hash;
+    /** Block height at which BIP65 becomes active */
+    int BIP65Height;
+    /** Block height at which BIP66 becomes active */
+    int BIP66Height;
     /**
      * Minimum blocks including miner confirmation of the total of 2016 blocks in a retargetting period,
      * (nPowTargetTimespan / nPowTargetSpacing) which is also used for BIP9 deployments.
diff --git a/src/main.cpp b/src/main.cpp
index 46118fff81..2a8772a97d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -106,11 +106,6 @@ map<uint256, COrphanTx> mapOrphanTransactions GUARDED_BY(cs_main);
 map<COutPoint, set<map<uint256, COrphanTx>::iterator, IteratorComparator>> mapOrphanTransactionsByPrev GUARDED_BY(cs_main);
 void EraseOrphansFor(NodeId peer) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
-/**
- * Returns true if there are nRequired or more blocks of minVersion or above
- * in the last Consensus::Params::nMajorityWindow blocks, starting at pstart and going backwards.
- */
-static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned nRequired, const Consensus::Params& consensusParams);
 static void CheckBlockIndex(const Consensus::Params& consensusParams);
 
 /** Constant stuff for coinbase transactions we create: */
@@ -2372,15 +2367,13 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
 
     unsigned int flags = fStrictPayToScriptHash ? SCRIPT_VERIFY_P2SH : SCRIPT_VERIFY_NONE;
 
-    // Start enforcing the DERSIG (BIP66) rules, for block.nVersion=3 blocks,
-    // when 75% of the network has upgraded:
-    if (block.nVersion >= 3 && IsSuperMajority(3, pindex->pprev, chainparams.GetConsensus().nMajorityEnforceBlockUpgrade, chainparams.GetConsensus())) {
+    // Start enforcing the DERSIG (BIP66) rule
+    if (pindex->nHeight >= chainparams.GetConsensus().BIP66Height) {
         flags |= SCRIPT_VERIFY_DERSIG;
     }
 
-    // Start enforcing CHECKLOCKTIMEVERIFY, (BIP65) for block.nVersion=4
-    // blocks, when 75% of the network has upgraded:
-    if (block.nVersion >= 4 && IsSuperMajority(4, pindex->pprev, chainparams.GetConsensus().nMajorityEnforceBlockUpgrade, chainparams.GetConsensus())) {
+    // Start enforcing CHECKLOCKTIMEVERIFY (BIP65) rule
+    if (pindex->nHeight >= chainparams.GetConsensus().BIP65Height) {
         flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
     }
 
@@ -3504,6 +3497,7 @@ std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBloc
 
 bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& state, const Consensus::Params& consensusParams, const CBlockIndex* pindexPrev, int64_t nAdjustedTime)
 {
+    const int nHeight = pindexPrev == NULL ? 0 : pindexPrev->nHeight + 1;
     // Check proof of work
     if (block.nBits != GetNextWorkRequired(pindexPrev, &block, consensusParams))
         return state.DoS(100, false, REJECT_INVALID, "bad-diffbits", false, "incorrect proof of work");
@@ -3517,10 +3511,12 @@ bool ContextualCheckBlockHeader(const CBlockHeader& block, CValidationState& sta
         return state.Invalid(false, REJECT_INVALID, "time-too-new", "block timestamp too far in the future");
 
     // Reject outdated version blocks when 95% (75% on testnet) of the network has upgraded:
-    for (int32_t version = 2; version < 5; ++version) // check for version 2, 3 and 4 upgrades
-        if (block.nVersion < version && IsSuperMajority(version, pindexPrev, consensusParams.nMajorityRejectBlockOutdated, consensusParams))
-            return state.Invalid(false, REJECT_OBSOLETE, strprintf("bad-version(0x%08x)", version - 1),
-                                 strprintf("rejected nVersion=0x%08x block", version - 1));
+    // check for version 2, 3 and 4 upgrades
+    if((block.nVersion < 2 && nHeight >= consensusParams.BIP34Height) ||
+       (block.nVersion < 3 && nHeight >= consensusParams.BIP66Height) ||
+       (block.nVersion < 4 && nHeight >= consensusParams.BIP65Height))
+            return state.Invalid(false, REJECT_OBSOLETE, strprintf("bad-version(0x%08x)", block.nVersion),
+                                 strprintf("rejected nVersion=0x%08x block", block.nVersion));
 
     return true;
 }
@@ -3546,9 +3542,8 @@ bool ContextualCheckBlock(const CBlock& block, CValidationState& state, const Co
         }
     }
 
-    // Enforce block.nVersion=2 rule that the coinbase starts with serialized block height
-    // if 750 of the last 1,000 blocks are version 2 or greater (51/100 if testnet):
-    if (block.nVersion >= 2 && IsSuperMajority(2, pindexPrev, consensusParams.nMajorityEnforceBlockUpgrade, consensusParams))
+    // Enforce rule that the coinbase starts with serialized block height
+    if (nHeight >= consensusParams.BIP34Height)
     {
         CScript expect = CScript() << nHeight;
         if (block.vtx[0].vin[0].scriptSig.size() < expect.size() ||
@@ -3722,19 +3717,6 @@ static bool AcceptBlock(const CBlock& block, CValidationState& state, const CCha
     return true;
 }
 
-static bool IsSuperMajority(int minVersion, const CBlockIndex* pstart, unsigned nRequired, const Consensus::Params& consensusParams)
-{
-    unsigned int nFound = 0;
-    for (int i = 0; i < consensusParams.nMajorityWindow && nFound < nRequired && pstart != NULL; i++)
-    {
-        if (pstart->nVersion >= minVersion)
-            ++nFound;
-        pstart = pstart->pprev;
-    }
-    return (nFound >= nRequired);
-}
-
-
 bool ProcessNewBlock(CValidationState& state, const CChainParams& chainparams, CNode* pfrom, const CBlock* pblock, bool fForceProcessing, const CDiskBlockPos* dbp)
 {
     {
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 9dc896b7af..e3c32d905a 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -817,22 +817,23 @@ UniValue verifychain(const UniValue& params, bool fHelp)
 }
 
 /** Implementation of IsSuperMajority with better feedback */
-static UniValue SoftForkMajorityDesc(int minVersion, CBlockIndex* pindex, int nRequired, const Consensus::Params& consensusParams)
+static UniValue SoftForkMajorityDesc(int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
 {
-    int nFound = 0;
-    CBlockIndex* pstart = pindex;
-    for (int i = 0; i < consensusParams.nMajorityWindow && pstart != NULL; i++)
+    UniValue rv(UniValue::VOBJ);
+    bool activated = false;
+    switch(version)
     {
-        if (pstart->nVersion >= minVersion)
-            ++nFound;
-        pstart = pstart->pprev;
+        case 2:
+            activated = pindex->nHeight >= consensusParams.BIP34Height;
+            break;
+        case 3:
+            activated = pindex->nHeight >= consensusParams.BIP66Height;
+            break;
+        case 4:
+            activated = pindex->nHeight >= consensusParams.BIP65Height;
+            break;
     }
-
-    UniValue rv(UniValue::VOBJ);
-    rv.push_back(Pair("status", nFound >= nRequired));
-    rv.push_back(Pair("found", nFound));
-    rv.push_back(Pair("required", nRequired));
-    rv.push_back(Pair("window", consensusParams.nMajorityWindow));
+    rv.push_back(Pair("status", activated));
     return rv;
 }
 
@@ -841,8 +842,7 @@ static UniValue SoftForkDesc(const std::string &name, int version, CBlockIndex*
     UniValue rv(UniValue::VOBJ);
     rv.push_back(Pair("id", name));
     rv.push_back(Pair("version", version));
-    rv.push_back(Pair("enforce", SoftForkMajorityDesc(version, pindex, consensusParams.nMajorityEnforceBlockUpgrade, consensusParams)));
-    rv.push_back(Pair("reject", SoftForkMajorityDesc(version, pindex, consensusParams.nMajorityRejectBlockOutdated, consensusParams)));
+    rv.push_back(Pair("reject", SoftForkMajorityDesc(version, pindex, consensusParams)));
     return rv;
 }
 
@@ -897,13 +897,9 @@ UniValue getblockchaininfo(const UniValue& params, bool fHelp)
             "     {\n"
             "        \"id\": \"xxxx\",        (string) name of softfork\n"
             "        \"version\": xx,         (numeric) block version\n"
-            "        \"enforce\": {           (object) progress toward enforcing the softfork rules for new-version blocks\n"
+            "        \"reject\": {            (object) progress toward rejecting pre-softfork blocks\n"
             "           \"status\": xx,       (boolean) true if threshold reached\n"
-            "           \"found\": xx,        (numeric) number of blocks with the new version found\n"
-            "           \"required\": xx,     (numeric) number of blocks required to trigger\n"
-            "           \"window\": xx,       (numeric) maximum size of examined window of recent blocks\n"
             "        },\n"
-            "        \"reject\": { ... }      (object) progress toward rejecting pre-softfork blocks (same fields as \"enforce\")\n"
             "     }, ...\n"
             "  ],\n"
             "  \"bip9_softforks\": {          (object) status of BIP9 softforks in progress\n"