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feehelper.go
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feehelper.go
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package mempool
import (
"bytes"
"errors"
"github.com/elastos/Elastos.ELA.SideChain/blockchain"
"github.com/elastos/Elastos.ELA.SideChain/config"
"github.com/elastos/Elastos.ELA.SideChain/spv"
"github.com/elastos/Elastos.ELA.SideChain/types"
"github.com/elastos/Elastos.ELA/common"
"github.com/elastos/Elastos.ELA/core/types/functions"
it "github.com/elastos/Elastos.ELA/core/types/interfaces"
"github.com/elastos/Elastos.ELA/core/types/payload"
)
type FeeHelper struct {
chainParams *config.Params
chainStore *blockchain.ChainStore
spvService *spv.Service
}
func NewFeeHelper(cfg *Config) *FeeHelper {
return &FeeHelper{
chainStore: cfg.ChainStore,
chainParams: cfg.ChainParams,
spvService: cfg.SpvService,
}
}
func (h *FeeHelper) GetTxFee(tx *types.Transaction, assetId common.Uint256) (common.Fixed64, error) {
feeMap, err := h.GetTxFeeMap(tx)
if err != nil {
return 0, err
}
return feeMap[assetId], nil
}
func (h *FeeHelper) GetTxFeeMap(tx *types.Transaction) (map[common.Uint256]common.Fixed64, error) {
feeMap := make(map[common.Uint256]common.Fixed64)
if tx.IsRechargeToSideChainTx() {
var mainChainTransaction it.Transaction
depositPayload, ok := tx.Payload.(*types.PayloadRechargeToSideChain)
if !ok {
return nil, errors.New("invalid recharge to side chain transaction payload")
}
if tx.PayloadVersion == types.RechargeToSideChainPayloadVersion0 {
reader := bytes.NewReader(depositPayload.MainChainTransaction)
mainChainTransaction, err := functions.GetTransactionByBytes(reader)
if err != nil {
return nil, err
}
if err := mainChainTransaction.Deserialize(reader); err != nil {
return nil, errors.New("main chain transaction deserialize failed")
}
} else if tx.PayloadVersion == types.RechargeToSideChainPayloadVersion1 {
var err error
mainChainTransaction, err = h.spvService.GetTransaction(&depositPayload.MainChainTransactionHash)
if err != nil {
return nil, errors.New("invalid main chain transaction payload")
}
}
crossChainPayload, ok := mainChainTransaction.Payload().(*payload.TransferCrossChainAsset)
if !ok {
return nil, errors.New("invalid transfer cross chain asset transaction payload")
}
for _, v := range tx.Outputs {
for i := 0; i < len(crossChainPayload.CrossChainAddresses); i++ {
targetAddress, err := v.ProgramHash.ToAddress()
if err != nil {
return nil, err
}
if targetAddress == crossChainPayload.CrossChainAddresses[i] {
mcAmount := mainChainTransaction.Outputs()[crossChainPayload.OutputIndexes[i]].Value
amount, ok := feeMap[v.AssetID]
if ok {
feeMap[v.AssetID] = amount + common.Fixed64(
float64(mcAmount)*h.chainParams.ExchangeRate) - v.Value
} else {
feeMap[v.AssetID] = common.Fixed64(float64(
mcAmount)*h.chainParams.ExchangeRate) - v.Value
}
}
}
}
return feeMap, nil
}
reference, err := h.chainStore.GetTxReference(tx)
if err != nil {
return nil, err
}
var inputs = make(map[common.Uint256]common.Fixed64)
var outputs = make(map[common.Uint256]common.Fixed64)
for _, v := range reference {
amout, ok := inputs[v.AssetID]
if ok {
inputs[v.AssetID] = amout + v.Value
} else {
inputs[v.AssetID] = v.Value
}
}
for _, v := range tx.Outputs {
amout, ok := outputs[v.AssetID]
if ok {
outputs[v.AssetID] = amout + v.Value
} else {
outputs[v.AssetID] = v.Value
}
}
//calc the balance of input vs output
for outputAssetid, outputValue := range outputs {
if inputValue, ok := inputs[outputAssetid]; ok {
feeMap[outputAssetid] = inputValue - outputValue
} else {
feeMap[outputAssetid] -= outputValue
}
}
for inputAssetid, inputValue := range inputs {
if _, exist := feeMap[inputAssetid]; !exist {
feeMap[inputAssetid] += inputValue
}
}
return feeMap, nil
}