From c0401780036663670febba7ccdbc70244d17fae6 Mon Sep 17 00:00:00 2001 From: Taco <1141374791@qq.com> Date: Sat, 12 Dec 2020 16:44:30 +0800 Subject: [PATCH] first commit --- README.md | 1 + a.sol | 175 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 176 insertions(+) create mode 100644 README.md create mode 100644 a.sol diff --git a/README.md b/README.md new file mode 100644 index 0000000..aac264b --- /dev/null +++ b/README.md @@ -0,0 +1 @@ +# block_chain_project diff --git a/a.sol b/a.sol new file mode 100644 index 0000000..651d712 --- /dev/null +++ b/a.sol @@ -0,0 +1,175 @@ +pragma solidity ^0.4.24; + +import "./Table.sol"; + +contract Asset { + // event + event RegisterEvent(int256 ret, string account, uint256 asset_value); + event TransferEvent(int256 ret, string from_account, string to_account, uint256 amount); + + constructor() public { + // 构造函数中创建t_asset表 + createTable(); + } + + function createTable() private { + TableFactory tf = TableFactory(0x1001); + // 资产管理表, key : account, field : asset_value + // | 资产账户(主键) | 资产金额 | + // |-------------------- |-------------------| + // | account | asset_value | + // |---------------------|-------------------| + // + // 创建表 + tf.createTable("t_asset", "account", "asset_value"); + } + + function openTable() private returns(Table) { + TableFactory tf = TableFactory(0x1001); + Table table = tf.openTable("t_asset"); + return table; + } + + /* + 描述 : 根据资产账户查询资产金额 + 参数 ： + account : 资产账户 + + 返回值： + 参数一： 成功返回0, 账户不存在返回-1 + 参数二： 第一个参数为0时有效，资产金额 + */ + function select(string account) public constant returns(int256, uint256) { + // 打开表 + Table table = openTable(); + // 查询 + Entries entries = table.select(account, table.newCondition()); + uint256 asset_value = 0; + if (0 == uint256(entries.size())) { + return (-1, asset_value); + } else { + Entry entry = entries.get(0); + return (0, uint256(entry.getInt("asset_value"))); + } + } + + /* + 描述 : 资产注册 + 参数 ： + account : 资产账户 + amount : 资产金额 + 返回值： + 0 资产注册成功 + -1 资产账户已存在 + -2 其他错误 + */ + function register(string account, uint256 asset_value) public returns(int256){ + int256 ret_code = 0; + int256 ret= 0; + uint256 temp_asset_value = 0; + // 查询账户是否存在 + (ret, temp_asset_value) = select(account); + if(ret != 0) { + Table table = openTable(); + + Entry entry = table.newEntry(); + entry.set("account", account); + entry.set("asset_value", int256(asset_value)); + // 插入 + int count = table.insert(account, entry); + if (count == 1) { + // 成功 + ret_code = 0; + } else { + // 失败? 无权限或者其他错误 + ret_code = -2; + } + } else { + // 账户已存在 + ret_code = -1; + } + + emit RegisterEvent(ret_code, account, asset_value); + + return ret_code; + } + + /* + 描述 : 资产转移 + 参数 ： + from_account : 转移资产账户 + to_account ： 接收资产账户 + amount ： 转移金额 + 返回值： + 0 资产转移成功 + -1 转移资产账户不存在 + -2 接收资产账户不存在 + -3 金额不足 + -4 金额溢出 + -5 其他错误 + */ + function transfer(string from_account, string to_account, uint256 amount) public returns(int256) { + // 查询转移资产账户信息 + int ret_code = 0; + int256 ret = 0; + uint256 from_asset_value = 0; + uint256 to_asset_value = 0; + + // 转移账户是否存在? + (ret, from_asset_value) = select(from_account); + if(ret != 0) { + ret_code = -1; + // 转移账户不存在 + emit TransferEvent(ret_code, from_account, to_account, amount); + return ret_code; + + } + + // 接受账户是否存在? + (ret, to_asset_value) = select(to_account); + if(ret != 0) { + ret_code = -2; + // 接收资产的账户不存在 + emit TransferEvent(ret_code, from_account, to_account, amount); + return ret_code; + } + + if(from_asset_value < amount) { + ret_code = -3; + // 转移资产的账户金额不足 + emit TransferEvent(ret_code, from_account, to_account, amount); + return ret_code; + } + + if (to_asset_value + amount < to_asset_value) { + ret_code = -4; + // 接收账户金额溢出 + emit TransferEvent(ret_code, from_account, to_account, amount); + return ret_code; + } + + Table table = openTable(); + + Entry entry0 = table.newEntry(); + entry0.set("account", from_account); + entry0.set("asset_value", int256(from_asset_value - amount)); + // 更新转账账户 + int count = table.update(from_account, entry0, table.newCondition()); + if(count != 1) { + ret_code = -5; + // 失败? 无权限或者其他错误? + emit TransferEvent(ret_code, from_account, to_account, amount); + return ret_code; + } + + Entry entry1 = table.newEntry(); + entry1.set("account", to_account); + entry1.set("asset_value", int256(to_asset_value + amount)); + // 更新接收账户 + table.update(to_account, entry1, table.newCondition()); + + emit TransferEvent(ret_code, from_account, to_account, amount); + + return ret_code; + } +} \ No newline at end of file