repair unintended hard fork at 745383

adjustments to hf sync


fixed compilation

src/chainparams.cpp

@@ -136,7 +136,7 @@ class CMainParams : public CChainParams {
         consensus.nAllowMinDiffMaxHeight = -1;
         consensus.nNormalizedNameForkHeight = 539940; // targeting 21 March 2019
         consensus.nMinRemovalWorkaroundHeight = 297706;
-        consensus.nMaxRemovalWorkaroundHeight = 100000000;
+        consensus.nMaxRemovalWorkaroundHeight = 658300;
         consensus.nAllClaimsInMerkleForkHeight = 658310; // targeting 30 Oct 2019
         consensus.fPowAllowMinDifficultyBlocks = false;
         consensus.fPowNoRetargeting = false;
@@ -147,10 +147,10 @@ class CMainParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0000000000000000000000000000000000000000000002bfdb5232f364d6774e"); //700k
+        consensus.nMinimumChainWork = uint256S("0000000000000000000000000000000000000000000003253077412df5b49766"); //749k
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("beaf6432c9a7be3ea8c333bd7a90d4b3e07b0f20c86aa2e5dfebc9eba340201c"); //700k
+        consensus.defaultAssumeValid = uint256S("b9676f45be594438a2011407c93bb530d817fa365846e7a6ecdf2790e4a0ad6b"); //749k
 
         /**
          * The message start string is designed to be unlikely to occur in normal data.
@@ -256,10 +256,10 @@ class CTestNetParams : public CChainParams {
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000000000000004f6bb06a9");
+        consensus.nMinimumChainWork = uint256S("00000000000000000000000000000000000000000000000000000054b7d280af"); // 8400
 
         // By default assume that the signatures in ancestors of this block are valid.
-        consensus.defaultAssumeValid = uint256S("0x079557d16edcd640c4057c9fddb81257263014fe384c4aa348c5b9d190650a46"); // 14
+        consensus.defaultAssumeValid = uint256S("50b68b892f4e0f2ef649df37ef10b702e826c8913cc785c5e8ec16dd6be83f8b"); // 8400
 
         pchMessageStart[0] = 0xfa;
         pchMessageStart[1] = 0xe4;

src/claimtrie/trie.cpp

@@ -200,6 +200,27 @@ bool CClaimTrieCacheBase::haveSupportInQueue(const std::string& name, const COut
     return false;
 }
 
+bool emptyNodeShouldExistAt(const sqlite::database& db, const std::string& name, int nNextHeight, int requiredChildren) {
+    auto end = name + std::string(256, std::numeric_limits<char>::max()); // 256 == MAX_CLAIM_NAME_SIZE + 1
+    auto query = db << "SELECT DISTINCT nodeName FROM claim "
+                        "WHERE nodeName BETWEEN ?1 AND ?2 "
+                        "AND activationHeight < ?3 AND expirationHeight >= ?3 "
+                        "ORDER BY nodeName"
+                        << name << end << nNextHeight;
+    std::unordered_set<char> ss;
+    for (auto&& row: query) {
+        std::string nn;
+        row >> nn;
+        if (nn == name)
+            return false;
+        assert(nn.size() > name.size());
+        ss.insert(nn[name.size()]);
+        if (ss.size() >= requiredChildren)
+            return true;
+    }
+    return false;
+}
+
 bool CClaimTrieCacheBase::deleteNodeIfPossible(const std::string& name, std::string& parent, int64_t& claims)
 {
     if (name.empty()) return false;
@@ -700,19 +721,10 @@ bool CClaimTrieCacheBase::removeClaim(const uint160& claimId, const COutPoint& o
     // because it's a parent one and should not be effectively erased
     // we had a bug in the old code where that situation would force a zero delay on re-add
     if (nNextHeight >= base->nMinRemovalWorkaroundHeight
-        && nNextHeight < base->nMaxRemovalWorkaroundHeight) { // TODO: hard fork this out (which we already tried once but failed)
-        // neither LIKE nor SUBSTR will use an index on a blob, but BETWEEN is a good, fast alternative
-        auto end = nodeName + std::string( 256, std::numeric_limits<char>::max()); // 256 == MAX_CLAIM_NAME_SIZE + 1
-        auto innerQuery = db << "SELECT nodeName FROM claim WHERE nodeName BETWEEN ?1 AND ?2 "
-                           "AND activationHeight < ?3 AND expirationHeight >= ?3 ORDER BY nodeName LIMIT 1"
-                        << nodeName << end << nNextHeight;
-        for (auto&& row: innerQuery) {
-            std::string shortestMatch;
-            row >> shortestMatch;
-            if (shortestMatch != nodeName)
-                // set this when there are no more claims on that name and that node still has children
-                removalWorkaround.insert(nodeName);
-        }
+        && nNextHeight < base->nMaxRemovalWorkaroundHeight
+        ) {
+        if (emptyNodeShouldExistAt(db, nodeName, nNextHeight, 1))
+            removalWorkaround.insert(nodeName);
     }
     return true;
 }
@@ -869,14 +881,30 @@ int CClaimTrieCacheBase::getDelayForName(const std::string& name, const uint160&
         return 0;
     }
 
-    // NOTE: old code had a bug in it where nodes with no claims but with children would get left in the cache after removal.
-    // This would cause the getNumBlocksOfContinuousOwnership to return zero (causing incorrect takeover height calc).
-    auto hit = removalWorkaround.find(name);
-    if (hit != removalWorkaround.end()) {
-        removalWorkaround.erase(hit);
-        return 0;
+    if (nNextHeight > base->nMaxRemovalWorkaroundHeight) {
+        if (!hasCurrentWinner)
+            return 0;
+
+        // TODO: hard fork this out! It's wrong but kept for backwards compatibility
+        // Plan: if we have no claims for this node but we do have multiple children
+        // such that we have an implicit node here then return a 0
+        if (emptyNodeShouldExistAt(db, name, nNextHeight, 2))
+            return 0;
+    }
+    else {
+        // NOTE: old code had a bug in it where nodes with no claims but with children would get left in the cache after removal.
+        // This would cause the getNumBlocksOfContinuousOwnership to return zero (causing incorrect takeover height calc).
+        auto hit = removalWorkaround.find(name);
+        if (hit != removalWorkaround.end()) {
+            removalWorkaround.erase(hit);
+            return 0;
+        }
     }
-    return hasCurrentWinner ? std::min((nNextHeight - winningTakeoverHeight) / base->nProportionalDelayFactor, 4032) : 0;
+
+    if (!hasCurrentWinner)
+        return 0;
+
+    return std::min((nNextHeight - winningTakeoverHeight) / base->nProportionalDelayFactor, 4032);
 }
 
 std::string CClaimTrieCacheBase::adjustNameForValidHeight(const std::string& name, int validHeight) const

src/test/claimtriebranching_tests.cpp

@@ -24,6 +24,32 @@ BOOST_AUTO_TEST_CASE(claim_replace_test) {
     BOOST_CHECK(fixture.is_best_claim("bassfisher", tx2));
 }
 
+BOOST_AUTO_TEST_CASE(triple_update_test)
+{
+    ClaimTrieChainFixture fixture;
+    CMutableTransaction tx1 = fixture.MakeClaim(fixture.GetCoinbase(), "test", "one", 10);
+    fixture.IncrementBlocks(1);
+    CMutableTransaction tx1a = fixture.MakeClaim(fixture.GetCoinbase(), "tester", "one", 3);
+    CMutableTransaction tx2 = fixture.MakeClaim(fixture.GetCoinbase(), "test", "one", 5);
+    auto height = ::ChainActive().Tip()->nHeight;
+    fixture.IncrementBlocks(9);
+
+    CMutableTransaction tx3 = fixture.MakeUpdate(tx1, "test", "two", ClaimIdHash(tx1.GetHash(), 0), 10);
+    CMutableTransaction tx4 = fixture.MakeUpdate(tx2, "test", "two", ClaimIdHash(tx2.GetHash(), 0), 15);
+    CMutableTransaction tx5 = fixture.MakeUpdate(tx4, "test", "two", ClaimIdHash(tx2.GetHash(), 0), 5);
+
+    fixture.IncrementBlocks(1);
+    BOOST_CHECK(fixture.is_best_claim("test", tx3));
+    uint160 id; int takeover;
+    BOOST_REQUIRE(fixture.getLastTakeoverForName("test", id, takeover));
+    BOOST_CHECK_EQUAL(takeover, height);
+    id = ClaimIdHash(tx2.GetHash(), 0);
+    std::string name;
+    CClaimValue value;
+    BOOST_REQUIRE(fixture.getClaimById(id, name, value));
+    BOOST_CHECK_EQUAL(value.nValidAtHeight, height+20);
+}
+
 BOOST_AUTO_TEST_CASE(takeover_stability_test) {
     // no competing bids
     ClaimTrieChainFixture fixture;

src/test/claimtrieexpirationfork_tests.cpp

@@ -824,11 +824,12 @@ BOOST_AUTO_TEST_CASE(removal_workaround_functions)
     fixture.IncrementBlocks(1);
     BOOST_CHECK(fixture.is_best_claim("a", tx3a));
 
-    fixture.IncrementBlocks(7);
-    CMutableTransaction tx4a = fixture.MakeUpdate(tx2a, "b", "b", ClaimIdHash(tx2a.GetHash(), 0), 4);
-    CMutableTransaction tx4b = fixture.MakeUpdate(tx2b, "b", "b", ClaimIdHash(tx2b.GetHash(), 0), 5); // trigger a takeover
-    fixture.IncrementBlocks(1);
-    BOOST_CHECK(fixture.is_best_claim("b", tx4b));
+    // TODO: bring this back after we hard fork out the removal workaround part 2!
+//    fixture.IncrementBlocks(7);
+//    CMutableTransaction tx4a = fixture.MakeUpdate(tx2a, "b", "b", ClaimIdHash(tx2a.GetHash(), 0), 4);
+//    CMutableTransaction tx4b = fixture.MakeUpdate(tx2b, "b", "b", ClaimIdHash(tx2b.GetHash(), 0), 5); // trigger a takeover
+//    fixture.IncrementBlocks(1);
+//    BOOST_CHECK(fixture.is_best_claim("b", tx4b));
 }
 
 BOOST_AUTO_TEST_SUITE_END()