Bugfix: RPC: blockchain: Display correct defaults in help for verifychain method

src/init.cpp

@@ -307,8 +307,8 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-alerts", strprintf(_("Receive and display P2P network alerts (default: %u)"), DEFAULT_ALERTS));
     strUsage += HelpMessageOpt("-alertnotify=<cmd>", _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)"));
     strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash)"));
-    strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), 288));
-    strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), 3));
+    strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), DEFAULT_CHECKBLOCKS));
+    strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), DEFAULT_CHECKLEVEL));
     strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), "bitcoin.conf"));
     if (mode == HMM_BITCOIND)
     {
@@ -1273,9 +1273,9 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
                 }
 
                 uiInterface.InitMessage(_("Verifying blocks..."));
-                if (fHavePruned && GetArg("-checkblocks", 288) > MIN_BLOCKS_TO_KEEP) {
+                if (fHavePruned && GetArg("-checkblocks", DEFAULT_CHECKBLOCKS) > MIN_BLOCKS_TO_KEEP) {
                     LogPrintf("Prune: pruned datadir may not have more than %d blocks; -checkblocks=%d may fail\n",
-                        MIN_BLOCKS_TO_KEEP, GetArg("-checkblocks", 288));
+                        MIN_BLOCKS_TO_KEEP, GetArg("-checkblocks", DEFAULT_CHECKBLOCKS));
                 }
 
                 {
@@ -1289,8 +1289,8 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
                     }
                 }
 
-                if (!CVerifyDB().VerifyDB(pcoinsdbview, GetArg("-checklevel", 3),
-                              GetArg("-checkblocks", 288))) {
+                if (!CVerifyDB().VerifyDB(pcoinsdbview, GetArg("-checklevel", DEFAULT_CHECKLEVEL),
+                              GetArg("-checkblocks", DEFAULT_CHECKBLOCKS))) {
                     strLoadError = _("Corrupted block database detected");
                     break;
                 }

src/main.h

@@ -123,6 +123,9 @@ extern uint64_t nPruneTarget;
 /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */
 static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
 
+static const signed int DEFAULT_CHECKBLOCKS = MIN_BLOCKS_TO_KEEP;
+static const unsigned int DEFAULT_CHECKLEVEL = 3;
+
 // Require that user allocate at least 550MB for block & undo files (blk???.dat and rev???.dat)
 // At 1MB per block, 288 blocks = 288MB.
 // Add 15% for Undo data = 331MB

src/rpcblockchain.cpp

@@ -539,13 +539,15 @@ UniValue gettxout(const UniValue& params, bool fHelp)
 
 UniValue verifychain(const UniValue& params, bool fHelp)
 {
+    int nCheckLevel = GetArg("-checklevel", DEFAULT_CHECKLEVEL);
+    int nCheckDepth = GetArg("-checkblocks", DEFAULT_CHECKBLOCKS);
     if (fHelp || params.size() > 2)
         throw runtime_error(
             "verifychain ( checklevel numblocks )\n"
             "\nVerifies blockchain database.\n"
             "\nArguments:\n"
-            "1. checklevel   (numeric, optional, 0-4, default=3) How thorough the block verification is.\n"
-            "2. numblocks    (numeric, optional, default=288, 0=all) The number of blocks to check.\n"
+            "1. checklevel   (numeric, optional, 0-4, default=" + strprintf("%d", nCheckLevel) + ") How thorough the block verification is.\n"
+            "2. numblocks    (numeric, optional, default=" + strprintf("%d", nCheckDepth) + ", 0=all) The number of blocks to check.\n"
             "\nResult:\n"
             "true|false       (boolean) Verified or not\n"
             "\nExamples:\n"
@@ -555,8 +557,6 @@ UniValue verifychain(const UniValue& params, bool fHelp)
 
     LOCK(cs_main);
 
-    int nCheckLevel = GetArg("-checklevel", 3);
-    int nCheckDepth = GetArg("-checkblocks", 288);
     if (params.size() > 0)
         nCheckLevel = params[0].get_int();
     if (params.size() > 1)