二值网络知乎：从概念到实现

本文将从概念、架构、功能三个方面对二值网络知乎进行详细阐述，通过代码实现展现二值网络知乎的实现过程和具体功能实现。

一、概念

二值网络知乎是一种基于区块链技术的社交网络平台。用户通过发布问题和回答来获取代币奖励，参与问题的解答和讨论。

用户在发布问题或回答时需要使用代币购买，同时其他用户在浏览问题时需要使用代币进行查看。系统会通过算法进行筛选，并对优秀的回答进行额外奖励。

二、架构

二值网络知乎采用分布式架构，由多个节点构成，同时节点之间通过P2P协议进行通信。

节点包括区块生成节点和验证节点。区块生成节点负责生成新的区块，同时验证节点负责验证新的区块，并进行共识机制的处理。

在具体实现中，我们使用Solidity语言进行智能合约的编写，同时使用web3.js进行与以太坊节点的通信。

三、功能

1、注册登录

用户在注册时需要提供个人信息和钱包地址，同时需要缴纳一定数量的代币作为注册费用。

在登录后，用户可以浏览其他用户的问题和回答，同时可以发布自己的问题和回答，并对其他用户的回答进行点赞和评论。

function register(string calldata _name, address _wallet, uint _value) public payable{
    require(msg.value == _value, "Please pay the registration fee");
    require(!userNameExists[_name], "The user name has been registered");
    userId[msg.sender] = users.length;
    users.push(User(_name, msg.sender, 0, _wallet, block.timestamp));
    balances[msg.sender] += msg.value;
    userNameExists[_name] = true;
}

function login() public view returns(string memory, address, uint, uint){
    require(userId[msg.sender] != MAX_UINT, "Please register first");
    User memory user = users[userId[msg.sender]];
    return (user.name, user.wallet, user.following, user.balance);
}

2、发布问题与回答

用户可以在二值网络知乎上发布问题和回答。在发布时需要使用代币进行付费，同时发布后其他用户需要使用代币进行查看。

function ask(string calldata _title, string calldata _content, uint256 _value) public payable{
    require(msg.value == _value, "Please pay the asking price");
    uint index = questions.length;
    questions.push(Question(msg.sender, _title, _content, _value, false, 0, block.timestamp));
    balances[msg.sender] += msg.value;
    questionerToQuestionIndex[msg.sender].push(index);
}


function answer(uint _questionIndex, string calldata _content, uint256 _value) public payable{
    require(msg.value == _value, "Please pay the answering price");
    Question storage question = questions[_questionIndex];
    require(!question.deleted, "The question has been deleted");
    balances[msg.sender] += msg.value;
    question.answererToAnswerIndex[msg.sender].push(question.answers.length);
    question.answers.push(Answer(msg.sender, _content, _value, false, 0, block.timestamp));
}

3、评价回答

在浏览其他用户的回答时，用户可以对回答进行点赞或者评论。同时，系统会通过一定的算法，对优秀的回答进行奖励。

function upVoteAnswer(uint _questionIndex, uint _answerIndex) public{
    Question storage question = questions[_questionIndex];
    Answer storage answer = question.answers[_answerIndex];
    require(!question.deleted && !answer.deleted, "The question/answer has been deleted");
    require(!answer.voted[msg.sender], "The answer has been voted");
    address answerer = answer.answerer;
    answer.voted[msg.sender] = true;
    answer.upvoteCount ++;
    users[userId[answerer]].score += upVoteScore;
    balances[answerer] += upVoteScore;
}



function addComment(uint _questionIndex, uint _answerIndex, string calldata _content) public{
    Question storage question = questions[_questionIndex];
    Answer storage answer = question.answers[_answerIndex];
    require(!question.deleted && !answer.deleted, "The question/answer has been deleted");
    Comment memory comment = Comment(msg.sender, _content, block.timestamp);
    answer.comments.push(comment);
}