34128d8e98
Update go.mod module line, all require/replace directives, and every .go import path from forge.lthn.ai/core/go-blockchain to dappco.re/go/core/blockchain. Add replace directives to bridge dappco.re paths to existing forge.lthn.ai registry during migration. Update CLAUDE.md, README, and docs to reflect the new module path. Co-Authored-By: Virgil <virgil@lethean.io>
89 lines
2 KiB
Go
89 lines
2 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package consensus
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import (
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"fmt"
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"math"
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coreerr "dappco.re/go/core/log"
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"dappco.re/go/core/blockchain/types"
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)
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// TxFee calculates the transaction fee for pre-HF4 (v0/v1) transactions.
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// Coinbase transactions return 0. For standard transactions, fee equals
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// the difference between total input amounts and total output amounts.
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func TxFee(tx *types.Transaction) (uint64, error) {
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if isCoinbase(tx) {
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return 0, nil
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}
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inputSum, err := sumInputs(tx)
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if err != nil {
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return 0, err
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}
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outputSum, err := sumOutputs(tx)
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if err != nil {
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return 0, err
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}
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if outputSum > inputSum {
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return 0, coreerr.E("TxFee", fmt.Sprintf("inputs=%d, outputs=%d", inputSum, outputSum), ErrNegativeFee)
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}
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return inputSum - outputSum, nil
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}
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// isCoinbase returns true if the transaction's first input is TxInputGenesis.
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func isCoinbase(tx *types.Transaction) bool {
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if len(tx.Vin) == 0 {
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return false
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}
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_, ok := tx.Vin[0].(types.TxInputGenesis)
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return ok
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}
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// sumInputs totals all transparent input amounts, checking for overflow.
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// Covers TxInputToKey, TxInputHTLC, and TxInputMultisig.
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func sumInputs(tx *types.Transaction) (uint64, error) {
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var total uint64
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for _, vin := range tx.Vin {
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var amount uint64
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switch v := vin.(type) {
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case types.TxInputToKey:
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amount = v.Amount
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case types.TxInputHTLC:
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amount = v.Amount
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case types.TxInputMultisig:
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amount = v.Amount
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default:
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continue
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}
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if total > math.MaxUint64-amount {
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return 0, ErrInputOverflow
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}
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total += amount
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}
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return total, nil
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}
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// sumOutputs totals all TxOutputBare amounts, checking for overflow.
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func sumOutputs(tx *types.Transaction) (uint64, error) {
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var total uint64
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for _, vout := range tx.Vout {
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bare, ok := vout.(types.TxOutputBare)
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if !ok {
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continue
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}
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if total > math.MaxUint64-bare.Amount {
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return 0, ErrOutputOverflow
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}
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total += bare.Amount
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}
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return total, nil
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}
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