rpc: Add hash_type MUHASH to gettxoutsetinfo

Also small style fix in rpc/util.cpp

3 files changed, 20 insertions, 22 deletions

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 3f97f6f3d9..cca9e0025a 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1047,13 +1047,26 @@ static RPCHelpMan pruneblockchain()
     };
 }
 
+CoinStatsHashType ParseHashType(const std::string& hash_type_input)
+{
+    if (hash_type_input == "hash_serialized_2") {
+        return CoinStatsHashType::HASH_SERIALIZED;
+    } else if (hash_type_input == "muhash") {
+        return CoinStatsHashType::MUHASH;
+    } else if (hash_type_input == "none") {
+        return CoinStatsHashType::NONE;
+    } else {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%s is not a valid hash_type", hash_type_input));
+    }
+}
+
 static RPCHelpMan gettxoutsetinfo()
 {
     return RPCHelpMan{"gettxoutsetinfo",
                 "\nReturns statistics about the unspent transaction output set.\n"
                 "Note this call may take some time.\n",
                 {
-                    {"hash_type", RPCArg::Type::STR, /* default */ "hash_serialized_2", "Which UTXO set hash should be calculated. Options: 'hash_serialized_2' (the legacy algorithm), 'none'."},
+                    {"hash_type", RPCArg::Type::STR, /* default */ "hash_serialized_2", "Which UTXO set hash should be calculated. Options: 'hash_serialized_2' (the legacy algorithm), 'muhash', 'none'."},
                 },
                 RPCResult{
                     RPCResult::Type::OBJ, "", "",
@@ -1063,7 +1076,8 @@ static RPCHelpMan gettxoutsetinfo()
                         {RPCResult::Type::NUM, "transactions", "The number of transactions with unspent outputs"},
                         {RPCResult::Type::NUM, "txouts", "The number of unspent transaction outputs"},
                         {RPCResult::Type::NUM, "bogosize", "A meaningless metric for UTXO set size"},
-                        {RPCResult::Type::STR_HEX, "hash_serialized_2", "The serialized hash (only present if 'hash_serialized_2' hash_type is chosen)"},
+                        {RPCResult::Type::STR_HEX, "hash_serialized_2", /* optional */ true, "The serialized hash (only present if 'hash_serialized_2' hash_type is chosen)"},
+                        {RPCResult::Type::STR_HEX, "muhash", /* optional */ true, "The serialized hash (only present if 'muhash' hash_type is chosen)"},
                         {RPCResult::Type::NUM, "disk_size", "The estimated size of the chainstate on disk"},
                         {RPCResult::Type::STR_AMOUNT, "total_amount", "The total amount"},
                     }},
@@ -1078,7 +1092,7 @@ static RPCHelpMan gettxoutsetinfo()
     CCoinsStats stats;
     ::ChainstateActive().ForceFlushStateToDisk();
 
-    const CoinStatsHashType hash_type = ParseHashType(request.params[0], CoinStatsHashType::HASH_SERIALIZED);
+    const CoinStatsHashType hash_type{request.params[0].isNull() ? CoinStatsHashType::HASH_SERIALIZED : ParseHashType(request.params[0].get_str())};
 
     CCoinsView* coins_view = WITH_LOCK(cs_main, return &ChainstateActive().CoinsDB());
     NodeContext& node = EnsureNodeContext(request.context);
@@ -1091,6 +1105,9 @@ static RPCHelpMan gettxoutsetinfo()
         if (hash_type == CoinStatsHashType::HASH_SERIALIZED) {
             ret.pushKV("hash_serialized_2", stats.hashSerialized.GetHex());
         }
+        if (hash_type == CoinStatsHashType::MUHASH) {
+              ret.pushKV("muhash", stats.hashSerialized.GetHex());
+        }
         ret.pushKV("disk_size", stats.nDiskSize);
         ret.pushKV("total_amount", ValueFromAmount(stats.nTotalAmount));
     } else {
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 31072114da..ecfea7017f 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -113,23 +113,6 @@ std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey)
     return ParseHexV(find_value(o, strKey), strKey);
 }
 
-CoinStatsHashType ParseHashType(const UniValue& param, const CoinStatsHashType default_type)
-{
-    if (param.isNull()) {
-        return default_type;
-    } else {
-        std::string hash_type_input = param.get_str();
-
-        if (hash_type_input == "hash_serialized_2") {
-            return CoinStatsHashType::HASH_SERIALIZED;
-        } else if (hash_type_input == "none") {
-            return CoinStatsHashType::NONE;
-        } else {
-            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("%d is not a valid hash_type", hash_type_input));
-        }
-    }
-}
-
 std::string HelpExampleCli(const std::string& methodname, const std::string& args)
 {
     return "> bitcoin-cli " + methodname + " " + args + "\n";
diff --git a/src/rpc/util.h b/src/rpc/util.h
index 942c243718..69a90b0904 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -77,8 +77,6 @@ extern uint256 ParseHashO(const UniValue& o, std::string strKey);
 extern std::vector<unsigned char> ParseHexV(const UniValue& v, std::string strName);
 extern std::vector<unsigned char> ParseHexO(const UniValue& o, std::string strKey);
 
-CoinStatsHashType ParseHashType(const UniValue& param, const CoinStatsHashType default_type);
-
 extern CAmount AmountFromValue(const UniValue& value);
 extern std::string HelpExampleCli(const std::string& methodname, const std::string& args);
 extern std::string HelpExampleRpc(const std::string& methodname, const std::string& args);