土豪发红包背景说明¶
发红包是现实中常见的一种生活方式，本方案是将原本发红包使用的现金，替换成了ERC20标准的积分。
场景说明¶
具体业务场景也可以是商家发放的优惠券，代金券等等。
接口¶
提供了3+2个合约：其中3个合约为目前标准化合约，分别是IERC20接口，mypoints（积分的一个模拟实现），SafeMath（安全计算库），另外2个合约是主要逻辑合约，redpacket合约和proxy合约。其中proxy合约是对外接受统一的积分授权服务，为辅助合约，redpacket为发红包合约。
proxy合约：接受外部积分授权的唯一接口。包含：
- setPointAddr(address _addr): 设置积分合约地址，_addr为一个已经部署的积分合约地址
- transfer(address _from, address _to, uint256 _value): 转账合约，完成抢红包动作时的转账操作
- addr()：返回本合约地址
- balanceOf(address _who): 获取用户的积分余额
- allowance(address _from): 获取_from授权给本合约的额度
redpacket合约：红包合约。包含：
- getProxy(): 获取proxy地址
- transfer(address _from, address _to, uint256 _value): 转账合约，完成抢红包动作时的转账操作
- sendRedPacket(uint256 c, bool ok, address addr, uint256 amount)：发红包动作，c代表数量，ok代表是否等额，addr为要发送的红包积分地址，amount代表红包数量
- grabRedpacket(): 抢红包动作
使用示例¶
当前控制台视图下，可以看到redpacket目录内文件如下：
parallels@parallels-vm:~/fisco/newconcole/console-0.6$ tree contracts/solidity/redpacket/
contracts/solidity/redpacket/
├── IERC20.sol
├── mypoints.sol
├── proxy.sol
├── redpacket.sol
└── SafeMath.sol
假如现在要执行一个发红包、抢红包动作，整个过程如下：
1. 合约初始化：¶
需要先部署积分合约，再部署redpacket合约。
1.1 需要先部署积分合约，并且给“土豪”发一点积分¶
部署积分合约
[group:1]> deploy contracts/solidity/redpacket/mypoints.sol ykc ykc
transaction hash: 0x8c7914c8023955690b2519e3b571d6bba7a47ca7a54c499f065a3161876aea08
contract address: 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f
currentAccount: 0x126235d39382170c8aafacfd1f430610190d8de9
给“土豪”发一点积分
[group:1]> listAccount
0x126235d39382170c8aafacfd1f430610190d8de9(current account) <=
0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f
[group:1]> call contracts/solidity/redpacket/mypoints.sol 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f mint 0x126235d39382170c8aafacfd1f430610190d8de9 100000
transaction hash: 0x80838424fdfe33d69bafc6d67f185b2a7a754f8697b567f373697e1274e6d365
---------------------------------------------------------------------------------------------
transaction status: 0x0
description: transaction executed successfully
---------------------------------------------------------------------------------------------
Receipt message: Success
Return message: Success
Return value size:1
Return types: (BOOL)
Return values:(true)
---------------------------------------------------------------------------------------------
Event logs
Event: {"Transfer":[[100000]]}
1.2 部署redpacket合约¶
部署redpacket合约
[group:1]> deploy contracts/solidity/redpacket/redpacket.sol
transaction hash: 0x6df39b0423a48b9cf89518b90623a796be1d36bb36c559ad9045af55e7106310
contract address: 0x8f671f69efab33437123b02701560ee80546b9e8
currentAccount: 0x126235d39382170c8aafacfd1f430610190d8de9
2. 合约调用¶
2.1 获取proxy地址¶
[group:1]> call contracts/solidity/redpacket/redpacket.sol 0x8f671f69efab33437123b02701560ee80546b9e8 getProxy
---------------------------------------------------------------------------------------------
Return code: 0
description: transaction executed successfully
Return message: Success
---------------------------------------------------------------------------------------------
Return value size:1
Return types: (ADDRESS)
Return values:(0x66e6fbb2cf7bf635653db398de624c09c2cd52cf)
---------------------------------------------------------------------------------------------
2.2 土豪调用积分授权合约¶
在这里要用到前一步获得的proxy合约地址，土豪将自己的积分授权给proxy合约。
[group:1]> call contracts/solidity/redpacket/mypoints.sol 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f approve 0x66e6fbb2cf7bf635653db398de624c09c2cd52cf 1000
transaction hash: 0xc8b0e6b93630751e68f6ae7a20e61ae0df1b22b8548944ea9e0806950b7a2deb
---------------------------------------------------------------------------------------------
transaction status: 0x0
description: transaction executed successfully
---------------------------------------------------------------------------------------------
Receipt message: Success
Return message: Success
Return value size:1
Return types: (BOOL)
Return values:(true)
---------------------------------------------------------------------------------------------
Event logs
Event: {"Approval":[[1000]]}
2.3 土豪执行发红包动作¶
这里说的“土豪”实际上是控制台的默认账户。
这一步，需要调用redpacket合约中的sendRedPacket，需要传给它的参数是：红包数量，是否等值红包，积分合约地址，红包总金额
[group:1]> call contracts/solidity/redpacket/redpacket.sol 0x8f671f69efab33437123b02701560ee80546b9e8 sendRedPacket 4 true 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f 1000
transaction hash: 0x0416c14b18fac4b3cebbf07d4e85b2146002f97e95d16eb7411cc1a92ba540c2
---------------------------------------------------------------------------------------------
transaction status: 0x0
description: transaction executed successfully
---------------------------------------------------------------------------------------------
Receipt message: Success
Return message: Success
Return values:[]
---------------------------------------------------------------------------------------------
Event logs
Event: {}
2.4 切换另外一个用户抢红包¶
先切换一下调用用户，使用loadAccount可以完成此操作。
[group:1]> listAccount
0x126235d39382170c8aafacfd1f430610190d8de9(current account) <=
0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f
[group:1]> loadAccount 0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f
Load account 0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f success!
[group:1]> listAccount
0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f(current account) <=
0x126235d39382170c8aafacfd1f430610190d8de9
查询当前账户的余额
[group:1]> call contracts/solidity/redpacket/mypoints.sol 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f balanceOf 0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f
---------------------------------------------------------------------------------------------
Return code: 0
description: transaction executed successfully
Return message: Success
---------------------------------------------------------------------------------------------
Return value size:1
Return types: (UINT)
Return values:(0)
---------------------------------------------------------------------------------------------
此时，可以调用抢红包方法grabRedpacket
[group:1]> call contracts/solidity/redpacket/redpacket.sol 0x8f671f69efab33437123b02701560ee80546b9e8 grabRedpacket
transaction hash: 0x856ee929442b6b7eb6e0d884df63330db59a2ccbcd37ccf3ea15c53821205225
---------------------------------------------------------------------------------------------
transaction status: 0x0
description: transaction executed successfully
---------------------------------------------------------------------------------------------
Receipt message: Success
Return message: Success
Return values:[]
---------------------------------------------------------------------------------------------
Event logs
Event: {}
再次查看当前账户的余额，发现变为了250。
[group:1]> call contracts/solidity/redpacket/mypoints.sol 0xdc9f277d4b706f0e8e4ce4c3b94a726ee716368f balanceOf 0xf6e254e6bd8c7d6799dd72d30fa440a8bf06a39f
---------------------------------------------------------------------------------------------
Return code: 0
description: transaction executed successfully
Return message: Success
---------------------------------------------------------------------------------------------
Return value size:1
Return types: (UINT)
Return values:(250)
---------------------------------------------------------------------------------------------