智能合约实例开发（2）——食品溯源——2020.10.31
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- 作者：Key
- 运行环境:FISCO BCOS联盟链中间件——WeBASE-Front
-
- Roles.sol
- Producer.sol
- Distributor.sol
- Retailer.sol
- FoodInfoItem.sol
- Trace.sol
- 最终效果图：
作者：Key
运行环境:FISCO BCOS联盟链中间件——WeBASE-Front
Roles.sol
pragma solidity^0.4.25;
library Roles{
struct Role{
mapping(address=>bool) bearer;
}
//判定地址存在否
function has(Role storage role,address amount)internal view returns(bool){
require(amount!=address(0));
return role.bearer[amount];
}
//添加角色
function add(Role storage role,address amount)internal{
require(!has(role,amount));
role.bearer[amount] = true;
}
//删除角色
function remove(Role storage role,address amount)internal{
require(has(role,amount));
role.bearer[amount] = false;
}
}
Producer.sol
pragma solidity^0.4.25;
import "Roles.sol";
contract Producer{
using Roles for Roles.Role;
Roles.Role private _producer;
event producerAdded(address amount);
event producerRemoved(address amount);
constructor(address producer)public{
_addProducer(producer);
}
function _addProducer(address amount)internal{
_producer.add(amount);
emit producerAdded(amount);
}
function _removeProducer(address amount)internal{
_producer.remove(amount);
emit producerAdded(amount);
}
function isProducer(address amount)public view returns(bool){
return _producer.has(amount);
}
modifier onlyProducer(){
require(isProducer(msg.sender));
_;
}
function addProducer(address amount)public onlyProducer{
_addProducer(amount);
}
function removeProducer()public{
_removeProducer(msg.sender);
}
}
Distributor.sol
pragma solidity^0.4.25;
import "Roles.sol";
contract Distributor{
using Roles for Roles.Role;
Roles.Role private _distributor;
event distributorAdded(address amount);
event distributorRemoved(address amount);
constructor(address distributor)public{
_addDistributor(distributor);
}
function _addDistributor(address amount)internal{
_distributor.add(amount);
emit distributorAdded(amount);
}
function _removeDistributor(address amount)internal{
_distributor.remove(amount);
emit distributorAdded(amount);
}
function isDistributor(address amount)public view returns(bool){
return _distributor.has(amount);
}
modifier onlyDistributor(){
require(isDistributor(msg.sender));
_;
}
function addDistributor(address amount)public onlyDistributor{
_addDistributor(amount);
}
function removeDistributor() public{
_removeDistributor(msg.sender);
}
}
Retailer.sol
pragma solidity^0.4.25;
import "Roles.sol";
contract Retailer{
using Roles for Roles.Role;
Roles.Role private _retailer;
event retailerAdded(address amount);
event retailerRemoved(address amount);
constructor(address distributor)public{
_addRetailer(distributor);
}
function _addRetailer(address amount)internal{
_retailer.add(amount);
emit retailerAdded(amount);
}
function _removeRetailer(address amount)internal{
_retailer.remove(amount);
emit retailerAdded(amount);
}
function isRetailer(address amount)public view returns(bool){
return _retailer.has(amount);
}
modifier onlyRetailer(){
require(isRetailer(msg.sender));
_;
}
function addRetailer(address amount)public onlyRetailer{
_addRetailer(amount);
}
function removeRetailer()public{
_removeRetailer(msg.sender);
}
}
FoodInfoItem.sol
pragma solidity^0.4.25;
contract FoodInfoItem{
uint256[] _timestamp; //时间戳
string[] _traceName; //交易名称
address[] _traceAddress; //交易地址
uint8[] _traceQuality; //交易食品质量
string _name; //食品名称
string _currentName; //当前交易名称
address _currentAddress; //当前交易地址
uint8 _currentQuality; //当前交易质量 0 优质 1 合格 2 不合格
uint8 _status; //当前交易状态 0生产 1 分销 2销售
address owner;
constructor(string name,string traceName,address traceAddress,uint8 quality)public{
_timestamp.push(now);
_traceName.push(traceName);
_traceAddress.push(traceAddress);
_traceQuality.push(quality);
_name = name;
_currentName = traceName;
_currentAddress = traceAddress;
_currentQuality = quality;
_status = 0;
owner = msg.sender;
}
function addFoodByDistributor(string traceName,address traceAddress,uint8 quality)public returns(bool){
require(_status == 0,"this is not already exit");
_timestamp.push(now);
_traceName.push(traceName);
_traceAddress.push(traceAddress);
_traceQuality.push(quality);
_currentName = traceName;
_currentAddress = traceAddress;
_currentQuality = quality;
_status = 1;
return true;
}
function addFoodByRetailer(string traceName,address traceAddress,uint8 quality)public returns(bool){
require(_status == 1,"this is not already exit");
_timestamp.push(now);
_traceName.push(traceName);
_traceAddress.push(traceAddress);
_traceQuality.push(quality);
_currentName = traceName;
_currentAddress = traceAddress;
_currentQuality = quality;
_status = 2;
return true;
}
function getFoodInfo()public view returns(uint256,string,string,uint8,address,uint8){
return(_timestamp[0],_name,_currentName,_currentQuality,_traceAddress[0],_status);
}
function getFoodInfoByNew()public view returns(uint256,string,string,address,uint8){
return(_timestamp[0],_name,_traceName[0],_traceAddress[0],_traceQuality[0]);
}
function getDFoodInfoByDistributor()public view returns(uint256,string,string,string,address,uint8){
return(_timestamp[0],_name,_traceName[0],_traceName[1],_traceAddress[1],_traceQuality[1]);
}
function getFoodInfoByRetailer()public view returns(uint256,string,string,string,string,address,uint8){
return(_timestamp[0],_name,_traceName[0],_traceName[1],_traceName[2],_traceAddress[2],_traceQuality[2]);
}
function getFoodInfoByRoles()public view returns(uint256[],address[],uint8[]){
return(_timestamp,_traceAddress,_traceQuality);
}
function getFoodInfoByAll()public view returns(string,uint256,string,uint8,uint256,string,uint8,uint256,string,uint8){
return(_name,_timestamp[0],_traceName[0],_traceQuality[0],_timestamp[1],_traceName[1],_traceQuality[1],_timestamp[2],_traceName[2],_traceQuality[2]);
}
}
Trace.sol
pragma solidity^0.4.25;
//pragma experimental ABIEncoderV2; //返回结构体类型
import "./Roles.sol";
import "./Producer.sol";
import "./Distributor.sol";
import "./Retailer.sol";
import "./FoodInfoItem.sol";
contract Trace is Producer,Distributor,Retailer{
mapping(uint256=>address) foods; //溯源码映射食品合约地址
uint256[] foodList;
address owner; //合约的部署者，管理员
//初始化三个角色，农场，分销商，超市
constructor(address producer,address distributor,address retailer)public Producer(producer) Distributor(distributor) Retailer(retailer){
owner = msg.sender;
}
//农村食品上链
function newFood(uint256 traceNumber,string name,string traceName,uint8 quality)public onlyProducer returns(address){
require(foods[traceNumber]==address(0));
FoodInfoItem food = new FoodInfoItem(name,traceName,msg.sender,quality);
foods[traceNumber] = food;
foodList.push(traceNumber);
return food;
}
//分销商食品上链
function addFoodByDistributor(uint256 traceNumber,string traceName,uint8 quality)public onlyDistributor returns(bool){
require(foods[traceNumber]!=address(0));
return FoodInfoItem(foods[traceNumber]).addFoodByDistributor(traceName,msg.sender,quality);
}
//超市食品上链
function addFoodByRetailer(uint256 traceNumber,string traceName,uint8 quality)public onlyRetailer returns(bool){
require(foods[traceNumber]!=address(0));
return FoodInfoItem(foods[traceNumber]).addFoodByRetailer(traceName,msg.sender,quality);
}
//当前食品溯源
function getFoodInfo(uint256 traceNumber)public view returns(uint256,string,string,uint8,address,uint8){
return FoodInfoItem(foods[traceNumber]).getFoodInfo();
}
//农场溯源
function getFoodInfoByNew(uint256 traceNumber)public view returns(uint256,string,string,address,uint8){
return FoodInfoItem(foods[traceNumber]).getFoodInfoByNew();
}
//分销商溯源
function getDFoodInfoByDistributor(uint256 traceNumber)public view returns(uint256,string,string,string,address,uint8){
return FoodInfoItem(foods[traceNumber]).getDFoodInfoByDistributor();
}
//超市溯源
function getFoodInfoByRetailer(uint256 traceNumber)public view returns(uint256,string,string,string,string,address,uint8){
return FoodInfoItem(foods[traceNumber]).getFoodInfoByRetailer();
}
//三个阶段溯源
function getFoodInfoByRoles(uint256 traceNumber)public view returns(uint256[],address[],uint8[]){
return FoodInfoItem(foods[traceNumber]).getFoodInfoByRoles();
}
//消费者整体溯源
function getFoodInfoByAll(uint256 traceNumber)public view returns(string,uint256,string,uint8,uint256,string,uint8,uint256,string,uint8){
return FoodInfoItem(foods[traceNumber]).getFoodInfoByAll();
}
//获取所有食品
function getFoodList()public view returns(uint256[]){
require(msg.sender == owner,'you are not owner');
return foodList;
}
}
最终效果图：
