[fees] introduce configurable hard dust limit

Co-authored-by: Ross Nicoll <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/init.cpp b/src/init.cpp
index 22dc45929..dd1942133 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -475,6 +475,7 @@ std::string HelpMessage(HelpMessageMode mode)
         strUsage += HelpMessageOpt("-incrementalrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to define cost of relay, used for mempool limiting and BIP 125 replacement. (default: %s)", CURRENCY_UNIT, FormatMoney(DEFAULT_INCREMENTAL_RELAY_FEE)));
         strUsage += HelpMessageOpt("-dustrelayfee=<amt>", strprintf("Fee rate (in %s/kB) used to defined dust, the value of an output such that it will cost about 1/3 of its value in fees at this fee rate to spend it. (default: %s)", CURRENCY_UNIT, FormatMoney(DUST_RELAY_TX_FEE)));
     }
+    strUsage += HelpMessageOpt("-dustlimit=<amt>", strprintf(_("Amount under which a transaction output is considered dust, in %s (default: %s)"), CURRENCY_UNIT, FormatMoney(DEFAULT_DUST_LIMIT)));
     strUsage += HelpMessageOpt("-bytespersigop", strprintf(_("Equivalent bytes per sigop in transactions for relay and mining (default: %u)"), DEFAULT_BYTES_PER_SIGOP));
     strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));
     strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
@@ -1043,6 +1044,14 @@ bool AppInitParameterInteraction()
         return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
     nBytesPerSigOp = GetArg("-bytespersigop", nBytesPerSigOp);
 
+    if (IsArgSet("-dustlimit"))
+    {
+        CAmount n = nDustLimit;
+        if (!ParseMoney(GetArg("-dustlimit", ""), n))
+            return InitError(AmountErrMsg("dustlimit", GetArg("-dustlimit", "")));
+        nDustLimit = n;
+    }
+
 #ifdef ENABLE_WALLET
     if (!CWallet::ParameterInteraction())
         return false;