NullifyMintTokens

Author: dragonheaven

node/node.go

@@ -76,6 +76,10 @@ var (
 	// V204EnhanceActivation indicates the activation of PegNet 2.0.4.
 	// Estimated to be  Mar 15th 2021
 	V204EnhanceActivation uint32 = 999999
+
+	// V204EnhanceActivation indicates the activation of PegNet 2.0.4.
+	// Estimated to be  Mar 15th 2021
+	V204BurnMintTokenActivation uint32 = 999999
 )
 
 func SetAllActivations(act uint32) {

node/sync.go

@@ -198,6 +198,41 @@ func (d *Pegnetd) MintTokensForBalance(ctx context.Context, tx *sql.Tx, height u
 	return nil
 }
 
+func (d *Pegnetd) NullifyMintTokens(ctx context.Context, tx *sql.Tx, height uint32) error {
+	fLog := log.WithFields(log.Fields{"height": height})
+
+	FAGlobalMintAddress, err := factom.NewFAAddress(GlobalMintAddress)
+	if err != nil {
+		log.WithFields(log.Fields{
+			"error": err,
+		}).Info("error getting mint address")
+		return err
+	}
+
+	// Get all balances for the address
+	balances, err := d.Pegnet.SelectBalances(&FAGlobalMintAddress)
+	if err != nil {
+		fLog.WithFields(log.Fields{
+			"err": err,
+		}).Info("zeroing burn | balances retrieval failed")
+	}
+
+	for _, tokenSupply := range MintTotalSupplyMap {
+		// Substract from every issuance
+		ticker := tokenSupply.Ticker
+		value, _ := balances[ticker]
+		_, _, err := d.Pegnet.SubFromBalance(tx, &FAGlobalMintAddress, ticker, value) // lastInd, txErr, err
+		if err != nil {
+			fLog.WithFields(log.Fields{
+				"ticker":  ticker,
+				"balance": value,
+			}).Info("zeroing burn | substract from balance failed")
+			return err
+		}
+	}
+	return nil
+}
+
 func (d *Pegnetd) NullifyBurnAddress(ctx context.Context, tx *sql.Tx, height uint32) error {
 	fLog := log.WithFields(log.Fields{"height": height})
 
@@ -310,6 +345,12 @@ func (d *Pegnetd) SyncBlock(ctx context.Context, tx *sql.Tx, height uint32) erro
 		}
 	}
 
+	if height == V204BurnMintTokenActivation {
+		if err := d.NullifyMintTokens(ctx, tx, d.Sync.Synced+1); err != nil {
+			return err
+		}
+	}
+
 	dblock := new(factom.DBlock)
 	dblock.Height = height
 	if err := dblock.Get(nil, d.FactomClient); err != nil {