sleeper.go

/*
Copyright IBM Corp. 2016 All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

		 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main

// Sleeper chaincode sleeps and works with one state variable
// Init - 1 param, a sleep time in millisecs
// Invoke - 4 or 3 params, "put" or "get", value to set and sleep time in millisecs
//
// Sleeper can be used to test the "chaincode.executetimeout" property

import (
	"fmt"
	"strconv"
	"time"

	"github.com/hyperledger/fabric/core/chaincode/shim"
	pb "github.com/hyperledger/fabric/protos/peer"
)

// SleeperChaincode example simple Chaincode implementation
type SleeperChaincode struct {
}

func (t *SleeperChaincode) sleep(sleepTime string) {
	st, _ := strconv.Atoi(sleepTime)
	if st >= 0 {
		time.Sleep(time.Duration(st) * time.Millisecond)
	}
}

// Init initializes chaincode...all it does is sleep a bi
func (t *SleeperChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
	args := stub.GetStringArgs()

	if len(args) != 1 {
		return shim.Error("Incorrect number of arguments. Expecting 1")
	}

	sleepTime := args[0]

	t.sleep(sleepTime)

	return shim.Success(nil)
}

// Invoke sets key/value and sleeps a bit
func (t *SleeperChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
	function, args := stub.GetFunctionAndParameters()
	if function == "put" {
		if len(args) != 3 {
			return shim.Error("Incorrect number of arguments. Expecting 3")
		}

		// Make payment of X units from A to B
		return t.invoke(stub, args)
	} else if function == "get" {
		if len(args) != 2 {
			return shim.Error("Incorrect number of arguments. Expecting 2")
		}

		// the old "Query" is now implemtned in invoke
		return t.query(stub, args)
	}

	return shim.Error("Invalid invoke function name. Expecting \"put\" or \"get\"")
}

// Transaction makes payment of X units from A to B
func (t *SleeperChaincode) invoke(stub shim.ChaincodeStubInterface, args []string) pb.Response {
	// set state
	key := args[0]
	val := args[1]

	err := stub.PutState(key, []byte(val))
	if err != nil {
		return shim.Error(err.Error())
	}

	sleepTime := args[2]

	//sleep for a bit
	t.sleep(sleepTime)

	return shim.Success([]byte("OK"))
}

// query callback representing the query of a chaincode
func (t *SleeperChaincode) query(stub shim.ChaincodeStubInterface, args []string) pb.Response {
	key := args[0]

	// Get the state from the ledger
	val, err := stub.GetState(key)
	if err != nil {
		return shim.Error(err.Error())
	}

	sleepTime := args[1]

	//sleep for a bit
	t.sleep(sleepTime)

	return shim.Success(val)
}

func main() {
	err := shim.Start(new(SleeperChaincode))
	if err != nil {
		fmt.Printf("Error starting Sleeper chaincode: %s", err)
	}
}