// Query callback representing the query of a chaincode
func (t *SimpleChaincode) Query(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
switch function {
case "getTran":
if len(args) < 1 {
return nil, errors.New("queryBTC operation must include single argument, the TX hash hex")
}
utxo := util.MakeUTXO(MakeChaincodeStore(stub))
tx, err := utxo.Query(args[0])
if err != nil {
return nil, fmt.Errorf("Error querying for transaction: %s", err)
}
if tx == nil {
var data []byte
return data, nil
}
return tx, nil
default:
return nil, errors.New("Unsupported operation")
}
}
// Invoke callback representing the invocation of a chaincode
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
switch function {
case "execute":
if len(args) < 1 {
return nil, errors.New("execute operation must include single argument, the base64 encoded form of a bitcoin transaction")
}
txDataBase64 := args[0]
txData, err := base64.StdEncoding.DecodeString(txDataBase64)
if err != nil {
return nil, fmt.Errorf("Error decoding TX as base64: %s", err)
}
utxo := util.MakeUTXO(MakeChaincodeStore(stub))
execResult, err := utxo.Execute(txData)
if err != nil {
return nil, fmt.Errorf("Error executing TX: %s", err)
}
fmt.Printf("\nExecResult: Coinbase: %t, SumInputs %d, SumOutputs %d\n\n", execResult.IsCoinbase, execResult.SumPriorOutputs, execResult.SumCurrentOutputs)
if execResult.IsCoinbase == false {
if execResult.SumCurrentOutputs > execResult.SumPriorOutputs {
return nil, fmt.Errorf("sumOfCurrentOutputs > sumOfPriorOutputs: sumOfCurrentOutputs = %d, sumOfPriorOutputs = %d", execResult.SumCurrentOutputs, execResult.SumPriorOutputs)
}
}
return nil, nil
default:
return nil, errors.New("Unsupported operation")
}
}