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chaincode.go
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chaincode.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package example01
import (
"fmt"
"strconv"
"github.com/hyperledger/fabric/core/chaincode/shim"
pb "github.com/hyperledger/fabric/protos/peer"
)
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct{}
var A, B string
var Aval, Bval, X int
// Init callback representing the invocation of a chaincode
// This chaincode will manage two accounts A and B and will transfer X units from A to B upon invoke
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
var err error
_, args := stub.GetFunctionAndParameters()
if len(args) != 4 {
return shim.Error("Incorrect number of arguments. Expecting 4")
}
// Initialize the chaincode
A = args[0]
Aval, err = strconv.Atoi(args[1])
if err != nil {
return shim.Error("Expecting integer value for asset holding")
}
B = args[2]
Bval, err = strconv.Atoi(args[3])
if err != nil {
return shim.Error("Expecting integer value for asset holding")
}
fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)
return shim.Success(nil)
}
func (t *SimpleChaincode) invoke(stub shim.ChaincodeStubInterface, args []string) pb.Response {
// Transaction makes payment of X units from A to B
X, err := strconv.Atoi(args[0])
if err != nil {
fmt.Printf("Error convert %s to integer: %s", args[0], err)
return shim.Error(fmt.Sprintf("Error convert %s to integer: %s", args[0], err))
}
Aval = Aval - X
Bval = Bval + X
ts, err2 := stub.GetTxTimestamp()
if err2 != nil {
fmt.Printf("Error getting transaction timestamp: %s", err2)
return shim.Error(fmt.Sprintf("Error getting transaction timestamp: %s", err2))
}
fmt.Printf("Transaction Time: %v,Aval = %d, Bval = %d\n", ts, Aval, Bval)
return shim.Success(nil)
}
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
function, args := stub.GetFunctionAndParameters()
if function == "invoke" {
return t.invoke(stub, args)
}
return shim.Error("Invalid invoke function name. Expecting \"invoke\"")
}