https://github.com/jacklightchen/eoslottery

基于EOS智能合约的彩票应用(a lottery based on eos contract)
https://github.com/jacklightchen/eoslottery

eos eos-contracts lottery

Last synced: 7 months ago
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基于EOS智能合约的彩票应用(a lottery based on eos contract)

• Host: GitHub
• URL: https://github.com/jacklightchen/eoslottery
• Owner: jacklightChen
• License: apache-2.0
• Created: 2019-04-07T10:08:18.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2019-04-14T14:30:10.000Z (over 6 years ago)
• Last Synced: 2025-01-30T06:42:16.505Z (9 months ago)
• Topics: eos, eos-contracts, lottery
• Language: C++
• Homepage:
• Size: 57.6 KB
• Stars: 1
• Watchers: 2
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# eoslottery

![License](https://img.shields.io/badge/license-Apache--2.0-blue.svg)

### 简介

基于EOS的福利彩票


预计实现每小时自动开奖并分发奖励

### 使用技术

智能合约 | ... 

:---:|:---

EOS | [eosio v1.7.1](https://github.com/EOSIO/eos)

编译工具 | [eosio.cdt v1.6.1](https://github.com/EOSIO/eosio.cdt)

测试网 | CryptoKylin Testnet RPC 入口:https://api-kylin.eoslaomao.com

### 目录结构

```

.

├── lottery.hpp

├── lottery.cpp

```

### 编译方法

``` shell

eosio-cpp -abigen -I ./ -o lottery.wasm lottery.cpp

```

### 合约流程

用户调用eosio.token的transfer 在memo里填类似1,2,3,4 作为买的4个彩票号码

合约定时取链上的哈希解析成4个数字来开奖

### action

* transfer


通过apply函数监听eosio.token的transfer转发到这个action进行相关的操作

* active


全局开关

* delaydraw


通过二次延迟开奖规避了一些简单的hack


注:二次延迟开奖依旧无法规避精心设计的deferred action的hack


故只适合自己鼓捣 不适合商用

### eos问题汇总

https://eosio.stackexchange.com

### 一些常见问题

1.provided permissions [{"actor":"lottery1test","permission":"eosio.code"}]

```shell

合约账户缺少eosio.token的权限

解决方法:

cleos -u https://api-kylin.eoslaomao.com set account permission YOUR_ACCOUNT_NAME active '{"threshold": 1, "keys":[{"key":"YOUR_PUBLIC_KEY", "weight":1}], "accounts":[{"permission":{"actor":"YOUR_ACCOUNT_NAME","permission":"eosio.code"},"weight":1}], "waits":[] }' owner -p YOUR_ACCOUNT_NAME

```

2.asset 运算

```shell

An eosio::asset::amount is of type int64_t, therefore when you divide, any decimal places will be truncated.

如需对asset类进行运算请使用以下的形式防止一些意外的类型转换损失精度

eosio::asset y(x.amount/10, eosio::symbol("EOS",4)); // Set asset y to have 10th of x

```