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chaincode_start.go
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126 lines (101 loc) · 4.16 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.
*/
// BLockchain Service reading chaincode and adding to the blockchain network will be done
// from a GitHub public repo.
// VERY IMPT: the changes to the chain code must be merged and deployed on the master branch!
// chaincodeID": {
// "path": "https://github.com/robertqin86/learn-chaincode/start" // the path points to master branch of the fork
// }
package main
import (
"errors" // errors - standard Go error format.
"fmt" // contains Println for debugging/logging.
// To enable read and write functions on the ledger, your chaincode must import the chaincode shim from Hyperledger Fabric.
// To compile your chaincode locally, you must have the Hyperledger Fabric code location specified in your GOPATH environment variable.
// Note: github.com/hyperledger/fabric/core/chaincode/shim is in your local repo which you clone using git clone -b v0.6 http://gerrit.hyperledger.org/r/fabric
// github.com/hyperledger/fabric/core/chaincode/shim - code that interfaces your Golang code with a network peer.
"github.com/hyperledger/fabric/core/chaincode/shim"
)
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}
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) {
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
err := stub.PutState("hello_world", []byte(args[0]))
if err != nil {
return nil, err
}
return nil, nil
}
// Invoke isur 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" {
return t.Init(stub, "init", args)
} else if function == "write" {
return t.write(stub, args)
}
fmt.Println("invoke did not find func: " + function)
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 == "read" { //read a variable
return t.read(stub, args)
}
fmt.Println("query did not find func: " + function)
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("running 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 funsies
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 - query function to read key/value pair
func (t *SimpleChaincode) read(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
var key, jsonResp string
var err error
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)
}
return valAsbytes, nil
}