106 lines
2.9 KiB
Go
106 lines
2.9 KiB
Go
/*
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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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"fmt"
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"strconv"
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"github.com/hyperledger/fabric/core/chaincode/shim"
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pb "github.com/hyperledger/fabric-protos-go/peer"
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)
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// SimpleChaincode example simple Chaincode implementation
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type SimpleChaincode struct {
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}
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var A, B string
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var Aval, Bval, X int
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// Init callback representing the invocation of a chaincode
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// This chaincode will manage two accounts A and B and will transfer X units from A to B upon invoke
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func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
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var err error
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_, args := stub.GetFunctionAndParameters()
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if len(args) != 4 {
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return shim.Error("Incorrect number of arguments. Expecting 4")
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}
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// Initialize the chaincode
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A = args[0]
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Aval, err = strconv.Atoi(args[1])
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if err != nil {
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return shim.Error("Expecting integer value for asset holding")
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}
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B = args[2]
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Bval, err = strconv.Atoi(args[3])
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if err != nil {
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return shim.Error("Expecting integer value for asset holding")
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}
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fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)
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/************
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// Write the state to the ledger
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err = stub.PutState(A, []byte(strconv.Itoa(Aval))
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if err != nil {
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return nil, err
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}
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stub.PutState(B, []byte(strconv.Itoa(Bval))
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err = stub.PutState(B, []byte(strconv.Itoa(Bval))
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if err != nil {
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return nil, err
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}
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************/
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return shim.Success(nil)
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}
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func (t *SimpleChaincode) invoke(stub shim.ChaincodeStubInterface, args []string) pb.Response {
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// Transaction makes payment of X units from A to B
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X, err := strconv.Atoi(args[0])
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if err != nil {
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fmt.Printf("Error convert %s to integer: %s", args[0], err)
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return shim.Error(fmt.Sprintf("Error convert %s to integer: %s", args[0], err))
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}
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Aval = Aval - X
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Bval = Bval + X
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ts, err2 := stub.GetTxTimestamp()
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if err2 != nil {
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fmt.Printf("Error getting transaction timestamp: %s", err2)
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return shim.Error(fmt.Sprintf("Error getting transaction timestamp: %s", err2))
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}
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fmt.Printf("Transaction Time: %v,Aval = %d, Bval = %d\n", ts, Aval, Bval)
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return shim.Success(nil)
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}
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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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if function == "invoke" {
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return t.invoke(stub, args)
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}
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return shim.Error("Invalid invoke function name. Expecting \"invoke\"")
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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 Simple chaincode: %s", err)
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}
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}
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