56_胡闰祺_第三次作业

Lesson-1/assignment/yours.sol

@@ -0,0 +1 @@
+/*作业请提交在这个目录下*/

Lesson-3/README.md

@@ -0,0 +1,16 @@
+## 硅谷live以太坊智能合约频道官方地址
+
+### 第三课《智能合约后端优化和产品化》
+
+目录结构
+  <br/>|
+  <br/>|--orgin 课程初始代码
+  <br/>|
+  <br/>|--assignment 课程作业提交代码
+<br/> 
+### 本节知识点
+第3课：智能合约后端优化和产品化
+- 如何通过数据结构优化降低合约执行成本
+- 合约的继承
+- 巧用modifier
+- 以太坊函数库的使用和基本介绍

Lesson-3/assignment/56_胡闰祺_第三次作业.sol

@@ -0,0 +1,140 @@
+/*作业请提交在这个目录下*/
+
+/*作业请提交在这个目录下*/
+
+############################################## Codes for Question 1. and Question 2. #########################################
+
+pragma solidity ^0.4.14;
+
+contract Payroll {
+
+    struct Employee {
+        address EmployeeAddress;
+        uint salary;
+        uint lastPayday;
+    }
+
+    mapping(address => Employee) public employees;
+
+    uint constant payDuration = 30 seconds;
+
+    address OwnerAddress;
+
+    uint totalSalary = 0;
+
+    address thisAddress = this;  
+
+    function Payroll() public {
+        OwnerAddress = msg.sender;
+    }
+
+    modifier onlyOwner() {
+        require(msg.sender == OwnerAddress);
+        _;
+    }
+
+    modifier employeeExist(address curr_EmployeeAddress) {
+
+        var curr_employee = employees[curr_EmployeeAddress];
+        assert(curr_employee.EmployeeAddress != 0x0);
+        _;
+
+    }
+
+    function addEmployee(address curr_EmployeeAddress, uint curr_salary) onlyOwner {
+
+        assert(employees[curr_EmployeeAddress].EmployeeAddress == 0x0);
+
+        uint unitSalary = curr_salary * 1 ether;
+        employees[curr_EmployeeAddress] = Employee(curr_EmployeeAddress, unitSalary, now);
+
+        totalSalary += unitSalary;
+
+    }
+
+    modifier partialPay(address curr_EmployeeAddress) {
+
+        _partialPay(employees[curr_EmployeeAddress]);
+        _;
+
+    }
+    function _partialPay(Employee employee) private {
+
+        uint tempSalary = employee.salary * (now - employee.lastPayday);
+        tempSalary = tempSalary / payDuration;
+
+        employee.EmployeeAddress.transfer(tempSalary);
+
+    }
+
+
+   function removeEmployee(address curr_EmployeeAddress) onlyOwner employeeExist(curr_EmployeeAddress) partialPay(curr_EmployeeAddress) {
+
+        var curr_employee = employees[curr_EmployeeAddress];
+        totalSalary -= curr_employee.salary;
+
+        delete employees[curr_EmployeeAddress];
+
+    }
+
+    function updateEmployee(address curr_EmployeeAddress, uint new_salary) onlyOwner employeeExist(curr_EmployeeAddress) partialPay(curr_EmployeeAddress) {
+
+        var curr_employee = employees[curr_EmployeeAddress];
+
+        uint unitSalary = new_salary * 1 ether;
+        totalSalary = totalSalary - curr_employee.salary + unitSalary;
+
+        curr_employee.salary = unitSalary;
+        curr_employee.lastPayday = now;
+
+    }
+
+    function changePaymentAddress(address curr_EmployeeAddress, address new_EmployeeAddress) onlyOwner employeeExist(curr_EmployeeAddress) partialPay(curr_EmployeeAddress) {
+
+        var curr_employee = employees[curr_EmployeeAddress];
+
+        curr_employee.EmployeeAddress = new_EmployeeAddress;
+
+    }
+
+    function addFund() payable public returns (uint)  {
+
+        return thisAddress.balance;
+
+    }
+
+    function calculateRunway() public view returns (uint) {
+
+        return thisAddress.balance / totalSalary;
+
+    }
+
+    function hasEnoughFund() public view returns (bool) {
+
+        return calculateRunway() > 0;
+
+    }
+
+    function getPaid() employeeExist(msg.sender){
+
+        var curr_employee = employees[msg.sender];
+
+        var newPayday = curr_employee.lastPayday + payDuration;
+        assert(newPayday < now);
+
+        curr_employee.lastPayday = newPayday;
+        curr_employee.EmployeeAddress.transfer(curr_employee.salary);
+
+    }    
+}
+
+################################################### Snapshots for Question 1. ##############################################
+### attached ###
+
+######################################################### Question 3. ######################################################
+
+       |-----> B-----|
+       |             |------> K1------|
+O ---->|-----> A--|--|                |-----> Z
+       |          |---------> K2------|
+       |-----> C--|

Lesson-3/assignment/README.md

@@ -0,0 +1,14 @@
+## 硅谷live以太坊智能合约 第三课作业
+这里是同学提交作业的目录
+
+### 第三课：课后作业
+- 第一题：完成今天所开发的合约产品化内容，使用Remix调用每一个函数，提交函数调用截图
+- 第二题：增加 changePaymentAddress 函数，更改员工的薪水支付地址，思考一下能否使用modifier整合某个功能
+- 第三题（加分题）：自学C3 Linearization, 求以下 contract Z 的继承线
+- contract O
+- contract A is O
+- contract B is O
+- contract C is O
+- contract K1 is A, B
+- contract K2 is A, C
+- contract Z is K1, K2

Lesson-3/orgin/README.md

@@ -0,0 +1,3 @@
+## 硅谷live以太坊智能合约 第三课
+
+这里是每一课的初始代码，有需要的同学可以参考

Lesson-4/README.md

@@ -0,0 +1,16 @@
+## 硅谷live以太坊智能合约频道官方地址
+
+### 第四课《使用Truffle架构进行前后端交互，测试，部署》
+
+目录结构
+  <br/>|
+  <br/>|--orgin 课程初始代码
+  <br/>|
+  <br/>|--assignment 课程作业提交代码
+<br/> 
+### 本节知识点
+第4课：使用Truffle架构进行前后端交互，测试，部署
+- 为什么要用Truffle，Truffle的基本概念
+- Truffle 的command line 功能
+- 初始化项目与Truffle项目目录结构
+- 编译部署合约到testrpc

Lesson-4/assignment/README.md

@@ -0,0 +1,12 @@
+## 硅谷live以太坊智能合约 第四课作业
+这里是同学提交作业的目录
+
+### 第四课：课后作业
+- 将第三课完成的payroll.sol程序导入truffle工程
+- 在test文件夹中，写出对如下两个函数的单元测试：
+- function addEmployee(address employeeId, uint salary) onlyOwner
+- function removeEmployee(address employeeId) onlyOwner employeeExist(employeeId)
+- 思考一下我们如何能覆盖所有的测试路径，包括函数异常的捕捉
+- (加分题,选作）
+- 写出对以下函数的基于solidity或javascript的单元测试 function getPaid() employeeExist(msg.sender)
+- Hint：思考如何对timestamp进行修改，是否需要对所测试的合约进行修改来达到测试的目的？

Lesson-4/assignment/yours.sol

@@ -0,0 +1 @@
+/*作业请提交在这个目录下*/

Lesson-4/orgin/README.md

@@ -0,0 +1,3 @@
+## 硅谷live以太坊智能合约 第四课
+
+这里是每一课的初始代码，有需要的同学可以参考

Lesson-4/orgin/payroll.sol

@@ -0,0 +1 @@
+

Lesson-5/README.md

@@ -0,0 +1,13 @@
+## 硅谷live以太坊智能合约频道官方地址
+
+### 第五课
+
+目录结构
+  <br/>|
+  <br/>|--orgin 课程初始代码
+  <br/>|
+  <br/>|--assignment 课程作业提交代码
+<br/> 
+
+### 本节知识点
+

Lesson-5/assignment/README.md

@@ -0,0 +1,2 @@
+## 硅谷live以太坊智能合约 第五课作业
+这里是同学提交作业的目录

Lesson-5/assignment/yours.sol

@@ -0,0 +1 @@
+/*作业请提交在这个目录下*/