add yield amount base units state change metadata to connect coin lockup

lib/block_view_lockups.go

@@ -1593,6 +1593,9 @@ func (bav *UtxoView) _connectCoinLockup(
 		PrevLockedBalanceEntries:   previousLockedBalanceEntries,
 		SetLockedBalanceEntries:    setLockedBalanceEntries,
 		PrevCoinEntry:              prevCoinEntry,
+		StateChangeMetadata: &CoinLockupStateChangeMetadata{
+			YieldAmountBaseUnits: yieldFromTxn,
+		},
 	})
 
 	// Construct UtxoOps in the event this transaction is reverted.

lib/state_change_metadata.go

@@ -3,6 +3,7 @@ package lib
 import (
 	"bytes"
 	"github.com/deso-protocol/core/collections"
+	"github.com/deso-protocol/uint256"
 	"github.com/pkg/errors"
 )
 
@@ -25,6 +26,7 @@ const (
 	EncoderTypeStakeRewardStateChangeMetadata           EncoderType = 2000015
 	EncoderTypeUnjailValidatorStateChangeMetadata       EncoderType = 2000016
 	EncoderTypeUnregisterAsValidatorStateChangeMetadata EncoderType = 2000017
+	EncoderTypeCoinLockupStateChangeMetadata            EncoderType = 2000018
 )
 
 func GetStateChangeMetadataFromOpType(opType OperationType) DeSoEncoder {
@@ -692,3 +694,30 @@ func (metadata *UnregisterAsValidatorStateChangeMetadata) GetVersionByte(blockHe
 func (metadata *UnregisterAsValidatorStateChangeMetadata) GetEncoderType() EncoderType {
 	return EncoderTypeUnregisterAsValidatorStateChangeMetadata
 }
+
+type CoinLockupStateChangeMetadata struct {
+	YieldAmountBaseUnits *uint256.Int
+}
+
+func (metadata *CoinLockupStateChangeMetadata) RawEncodeWithoutMetadata(blockHeight uint64, skipMetadata ...bool) []byte {
+	var data []byte
+	data = append(data, VariableEncodeUint256(metadata.YieldAmountBaseUnits)...)
+	return data
+}
+
+func (metadata *CoinLockupStateChangeMetadata) RawDecodeWithoutMetadata(blockHeight uint64, rr *bytes.Reader) error {
+	var err error
+	metadata.YieldAmountBaseUnits, err = VariableDecodeUint256(rr)
+	if err != nil {
+		return errors.Wrapf(err, "CoinLockupStateChangeMetadata.Decode: Problem reading YieldAmountBaseUnits")
+	}
+	return nil
+}
+
+func (metadata *CoinLockupStateChangeMetadata) GetVersionByte(blockHeight uint64) byte {
+	return 0
+}
+
+func (metadata *CoinLockupStateChangeMetadata) GetEncoderType() EncoderType {
+	return EncoderTypeCoinLockupStateChangeMetadata
+}