Restore BDB block index wrapper and enable it by default.

[novacoin.git] / src / db.cpp

diff --git a/src/db.cpp b/src/db.cpp
index cc069e1..dd0463d 100644 (file)
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -20,7 +20,7 @@ using namespace boost;
 
 
 unsigned int nWalletDBUpdated;
-
+extern bool fUseMemoryLog;
 
 
 //
@@ -111,6 +111,31 @@ bool CDBEnv::Open(boost::filesystem::path pathEnv_)
     fDbEnvInit = true;
     fMockDb = false;
 
+#ifndef USE_LEVELDB
+    // Check that the number of locks is sufficient (to prevent chain fork possibility, read http://bitcoin.org/may15 for more info)
+    u_int32_t nMaxLocks;
+    if (!dbenv.get_lk_max_locks(&nMaxLocks))
+    {
+        int nBlocks, nDeepReorg;
+        std::string strMessage;
+
+        nBlocks = nMaxLocks / 48768;
+        nDeepReorg = (nBlocks - 1) / 2;
+
+        printf("Final lk_max_locks is %lu, sufficient for (worst case) %d block%s in a single transaction (up to a %d-deep reorganization)\n", (unsigned long)nMaxLocks, nBlocks, (nBlocks == 1) ? "" : "s", nDeepReorg);
+        if (nDeepReorg < 3)
+        {
+            if (nBlocks < 1)
+                strMessage = strprintf(_("Warning: DB_CONFIG has set_lk_max_locks %lu, which may be too low for a single block. If this limit is reached, NovaCoin may stop working."), (unsigned long)nMaxLocks);
+            else
+                strMessage = strprintf(_("Warning: DB_CONFIG has set_lk_max_locks %lu, which may be too low for a common blockchain reorganization. If this limit is reached, NovaCoin may stop working."), (unsigned long)nMaxLocks);
+
+            strMiscWarning = strMessage;
+            printf("*** %s\n", strMessage.c_str());
+        }
+    }
+#endif
+
     return true;
 }
 
@@ -131,7 +156,7 @@ void CDBEnv::MakeMock()
     dbenv.set_lk_max_objects(10000);
     dbenv.set_flags(DB_AUTO_COMMIT, 1);
 #ifdef DB_LOG_IN_MEMORY
-    dbenv.log_set_config(DB_LOG_IN_MEMORY, 1);
+    dbenv.log_set_config(DB_LOG_IN_MEMORY, fUseMemoryLog ? 1 : 0);
 #endif
     int ret = dbenv.open(NULL,
                      DB_CREATE     |