105 lines
3.2 KiB
Go
105 lines
3.2 KiB
Go
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/*
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Copyright IBM Corp. 2016 All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"github.com/hyperledger/fabric/core/chaincode/shim"
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"github.com/hyperledger/fabric/examples/chaincode/go/utxo/util"
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)
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// The UTXO example chaincode contains a single invocation function named execute. This function accepts BASE64
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// encoded transactions from the Bitcoin network. This chaincode will parse the transactions and pass the transaction
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// components to the Bitcoin libconsensus C library for script verification. A table of UTXOs is maintained to ensure
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// each transaction is valid.
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// Documentation can be found at
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// https://github.com/hyperledger/fabric/blob/master/examples/chaincode/go/utxo/README.md
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// SimpleChaincode example simple Chaincode implementation
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type SimpleChaincode struct {
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}
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// Init does nothing in the UTXO chaincode
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func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
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return nil, nil
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}
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// Invoke callback representing the invocation of a chaincode
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func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
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function, args := stub.GetFunctionAndParameters()
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switch function {
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case "execute":
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if len(args) < 1 {
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return nil, errors.New("execute operation must include single argument, the base64 encoded form of a bitcoin transaction")
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}
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txDataBase64 := args[0]
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txData, err := base64.StdEncoding.DecodeString(txDataBase64)
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if err != nil {
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return nil, fmt.Errorf("Error decoding TX as base64: %s", err)
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}
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utxo := util.MakeUTXO(MakeChaincodeStore(stub))
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execResult, err := utxo.Execute(txData)
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if err != nil {
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return nil, fmt.Errorf("Error executing TX: %s", err)
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}
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fmt.Printf("\nExecResult: Coinbase: %t, SumInputs %d, SumOutputs %d\n\n", execResult.IsCoinbase, execResult.SumPriorOutputs, execResult.SumCurrentOutputs)
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if execResult.IsCoinbase == false {
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if execResult.SumCurrentOutputs > execResult.SumPriorOutputs {
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return nil, fmt.Errorf("sumOfCurrentOutputs > sumOfPriorOutputs: sumOfCurrentOutputs = %d, sumOfPriorOutputs = %d", execResult.SumCurrentOutputs, execResult.SumPriorOutputs)
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}
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}
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return nil, nil
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case "getTran":
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if len(args) < 1 {
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return nil, errors.New("queryBTC operation must include single argument, the TX hash hex")
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}
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utxo := util.MakeUTXO(MakeChaincodeStore(stub))
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tx, err := utxo.Query(args[0])
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if err != nil {
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return nil, fmt.Errorf("Error querying for transaction: %s", err)
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}
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if tx == nil {
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var data []byte
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return data, nil
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}
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return tx, nil
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default:
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return nil, errors.New("Unsupported operation")
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}
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}
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func main() {
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err := shim.Start(new(SimpleChaincode))
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if err != nil {
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fmt.Printf("Error starting chaincode: %s", err)
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}
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}
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