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chaincode_start.go
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124 lines (105 loc) · 3.78 KB
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/*
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
import (
"errors"
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
)
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}
// ============================================================================================================================
// Main
// ============================================================================================================================
func main() {
err := shim.Start(new(SimpleChaincode))
if err != nil {
fmt.Printf("Error starting Simple chaincode: %s", err)
}
}
// Init resets all the things
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("Init Started GIRAFE")
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
err := stub.PutState("HelloWorld", []byte(args[0]))
fmt.Println("stub.PutState(HelloWorld,[]byte(args[0]))" + args[0])
if err != nil {
return nil, err
}
return nil, nil
}
// Invoke is our entry point to invoke a chaincode function
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("invoke is running " + function)
// Handle different functions
if function == "init" {
//initialize the chaincode state, used as reset
return t.Init(stub, "init", args)
} else if function == "write" {
return t.write(stub, args)
}
fmt.Println("invoke did not find func: " + function) //error
return nil, errors.New("Received unknown function invocation: " + function)
}
// Query is our entry point for queries
func (t *SimpleChaincode) Query(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("query is running " + function)
// Handle different functions
//if function == "dummy_query" {
// //read a variable
// fmt.Println("hi there " + function) //error
// return nil, nil
//} else
if function == "read" {
//read a variable
return t.read(stub, args)
}
fmt.Println("query did not find func: " + function) //error
return nil, errors.New("Received unknown function query: " + function)
}
// write - invoke function to write key/value pair
func (t *SimpleChaincode) write(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
var key, value string
var err error
fmt.Println("Runing write")
if len(args) != 2 {
return nil, errors.New("Incorrect number of arguments. Expecting 2. name of the key and value to set")
}
key = args[0] //rename for fun
value = args[1]
err = stub.PutState(key, []byte(value)) //write the variable into the chaincode state
if err != nil {
return nil, err
}
return nil, nil
}
// Read value
func (t *SimpleChaincode) read(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
var key, jsonResp string
var err error
fmt.Println("Runing read")
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting name of the key to query")
}
key = args[0]
valAsbytes, err := stub.GetState(key)
if err != nil {
jsonResp = "{\"Error\":\"Failed to get state for " + key + "\"}"
return nil, errors.New(jsonResp)
}
//fmt.Println("write retrun " + string(valAsbytes))
return valAsbytes, nil
}