تحويلات رموز ERC-20 والموافقة عليها من عقد سوليديتي ذكي

1pragma solidity ^0.8.0;
2
3interface IERC20 {
4
5    function totalSupply() external view returns (uint256);
6    function balanceOf(address account) external view returns (uint256);
7    function allowance(address owner, address spender) external view returns (uint256);
8
9    function transfer(address recipient, uint256 amount) external returns (bool);
10    function approve(address spender, uint256 amount) external returns (bool);
11    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
12
13    event Transfer(address indexed from, address indexed to, uint256 value);
14    event Approval(address indexed owner, address indexed spender, uint256 value);
15}
16
17contract ERC20Basic is IERC20 {
18
19    string public constant name = "ERC20Basic";
20    string public constant symbol = "ERC";
21    uint8 public constant decimals = 18;
22
23    mapping(address => uint256) balances;
24
25    mapping(address => mapping (address => uint256)) allowed;
26
27    uint256 totalSupply_ = 10 ether;
28
29   constructor() {
30	balances[msg.sender] = totalSupply_;
31    }
32
33    function totalSupply() public override view returns (uint256) {
34	return totalSupply_;
35    }
36
37    function balanceOf(address tokenOwner) public override view returns (uint256) {
38        return balances[tokenOwner];
39    }
40
41    function transfer(address receiver, uint256 numTokens) public override returns (bool) {
42        require(numTokens <= balances[msg.sender]);
43        balances[msg.sender] = balances[msg.sender]-numTokens;
44        balances[receiver] = balances[receiver]+numTokens;
45        emit Transfer(msg.sender, receiver, numTokens);
46        return true;
47    }
48
49    function approve(address delegate, uint256 numTokens) public override returns (bool) {
50        allowed[msg.sender][delegate] = numTokens;
51        emit Approval(msg.sender, delegate, numTokens);
52        return true;
53    }
54
55    function allowance(address owner, address delegate) public override view returns (uint) {
56        return allowed[owner][delegate];
57    }
58
59    function transferFrom(address owner, address buyer, uint256 numTokens) public override returns (bool) {
60        require(numTokens <= balances[owner]);
61        require(numTokens <= allowed[owner][msg.sender]);
62
63        balances[owner] = balances[owner]-numTokens;
64        allowed[owner][msg.sender] = allowed[owner][msg.sender]-numTokens;
65        balances[buyer] = balances[buyer]+numTokens;
66        emit Transfer(owner, buyer, numTokens);
67        return true;
68    }
69}
70
إظهار الكل
نسخ

1contract DEX {
2
3    IERC20 public token;
4
5    event Bought(uint256 amount);
6    event Sold(uint256 amount);
7
8    constructor() {
9        token = new ERC20Basic();
10    }
11
12    function buy() payable public {
13        // سيتم التنفيذ لاحقاً
14    }
15
16    function sell(uint256 amount) public {
17        // سيتم التنفيذ لاحقاً
18    }
19
20}
إظهار الكل
نسخ

1function buy() payable public {
2    uint256 amountTobuy = msg.value;
3    uint256 dexBalance = token.balanceOf(address(this));
4    require(amountTobuy > 0, "تحتاج إلى إرسال بعض الإيثر");
5    require(amountTobuy <= dexBalance, "لا توجد رموز كافية في الاحتياطي");
6    token.transfer(msg.sender, amountTobuy);
7    emit Bought(amountTobuy);
8}
نسخ

1#### بايثون في وحدة تحكم Brownie التفاعلية...
2
3# نشر منصة التداول اللامركزية (DEX)
4dex = DEX.deploy({'from':account1})
5
6# استدعاء وظيفة الشراء لمبادلة الإيثر بالرمز
7# 1e18 هو 1 إيثر مُقوّم بالـ wei
8dex.buy({'from': account2, 1e18})
9
10# الحصول على عنوان النشر لرمز ERC20
11# الذي تم نشره أثناء إنشاء عقد DEX
12# dex.token() تُرجع عنوان النشر للرمز
13token = ERC20Basic.at(dex.token())
14
15# استدعاء وظيفة الموافقة الخاصة بالرمز
16# الموافقة على عنوان DEX كمنفق
17# وعدد الرموز التي يُسمح له بإنفاقها
18token.approve(dex.address, 3e18, {'from':account2})
19
إظهار الكل
نسخ

1function sell(uint256 amount) public {
2    require(amount > 0, "تحتاج إلى بيع بعض الرموز على الأقل");
3    uint256 allowance = token.allowance(msg.sender, address(this));
4    require(allowance >= amount, "تحقق من بدل الرمز");
5    token.transferFrom(msg.sender, address(this), amount);
6    payable(msg.sender).transfer(amount);
7    emit Sold(amount);
8}
نسخ

1pragma solidity ^0.8.0;
2
3interface IERC20 {
4
5    function totalSupply() external view returns (uint256);
6    function balanceOf(address account) external view returns (uint256);
7    function allowance(address owner, address spender) external view returns (uint256);
8
9    function transfer(address recipient, uint256 amount) external returns (bool);
10    function approve(address spender, uint256 amount) external returns (bool);
11    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
12
13    event Transfer(address indexed from, address indexed to, uint256 value);
14    event Approval(address indexed owner, address indexed spender, uint256 value);
15}
16
17contract ERC20Basic is IERC20 {
18
19    string public constant name = "ERC20Basic";
20    string public constant symbol = "ERC";
21    uint8 public constant decimals = 18;
22
23    mapping(address => uint256) balances;
24
25    mapping(address => mapping (address => uint256)) allowed;
26
27    uint256 totalSupply_ = 10 ether;
28
29   constructor() {
30	balances[msg.sender] = totalSupply_;
31    }
32
33    function totalSupply() public override view returns (uint256) {
34	return totalSupply_;
35    }
36
37    function balanceOf(address tokenOwner) public override view returns (uint256) {
38        return balances[tokenOwner];
39    }
40
41    function transfer(address receiver, uint256 numTokens) public override returns (bool) {
42        require(numTokens <= balances[msg.sender]);
43        balances[msg.sender] = balances[msg.sender]-numTokens;
44        balances[receiver] = balances[receiver]+numTokens;
45        emit Transfer(msg.sender, receiver, numTokens);
46        return true;
47    }
48
49    function approve(address delegate, uint256 numTokens) public override returns (bool) {
50        allowed[msg.sender][delegate] = numTokens;
51        emit Approval(msg.sender, delegate, numTokens);
52        return true;
53    }
54
55    function allowance(address owner, address delegate) public override view returns (uint) {
56        return allowed[owner][delegate];
57    }
58
59    function transferFrom(address owner, address buyer, uint256 numTokens) public override returns (bool) {
60        require(numTokens <= balances[owner]);
61        require(numTokens <= allowed[owner][msg.sender]);
62
63        balances[owner] = balances[owner]-numTokens;
64        allowed[owner][msg.sender] = allowed[owner][msg.sender]-numTokens;
65        balances[buyer] = balances[buyer]+numTokens;
66        emit Transfer(owner, buyer, numTokens);
67        return true;
68    }
69}
70
71contract DEX {
72
73    event Bought(uint256 amount);
74    event Sold(uint256 amount);
75
76    IERC20 public token;
77
78    constructor() {
79        token = new ERC20Basic();
80    }
81
82    function buy() payable public {
83        uint256 amountTobuy = msg.value;
84        uint256 dexBalance = token.balanceOf(address(this));
85        require(amountTobuy > 0, "تحتاج إلى إرسال بعض الإيثر");
86        require(amountTobuy <= dexBalance, "لا توجد رموز كافية في الاحتياطي");
87        token.transfer(msg.sender, amountTobuy);
88        emit Bought(amountTobuy);
89    }
90
91    function sell(uint256 amount) public {
92        require(amount > 0, "تحتاج إلى بيع بعض الرموز على الأقل");
93        uint256 allowance = token.allowance(msg.sender, address(this));
94        require(allowance >= amount, "تحقق من بدل الرمز");
95        token.transferFrom(msg.sender, address(this), amount);
96        payable(msg.sender).transfer(amount);
97        emit Sold(amount);
98    }
99
100}
إظهار الكل
نسخ