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javascript - 节点服务器无法访问对象块（面向对象的 javascript）

问题描述

我正在尝试制作一个可以通过高度访问每个块对象的节点服务器，所以这里是获取路由：

    // Enpoint to Get a Block by Height (GET Endpoint)
getBlockByHeight() {
    this.app.get("/block/height/:height", async (req, res) => {
        if(req.params.height) {
            const height = parseInt(req.params.height);
            let block = await this.blockchain.getBlockByHeight(height);
            if(block){
                return res.status(200).json(block);
            } else {
                return res.status(404).send("Block Not Found!");
            }
        } else {
            return res.status(404).send("Block Not Found! Review the Parameters!");
        }
        
    });
}

这是获取块高度的函数：

getBlockByHeight(height) {
        let self = this;
        return new Promise((resolve, reject) => {
            let block = self.chain.filter(p => p.height === height)[0];
            if(block){
                resolve(block);
            } else {
                resolve(null);
            }
        });
    }

这是block.js：

const SHA256 = require('crypto-js/sha256');
const hex2ascii = require('hex2ascii');

class Block {

    // Constructor - argument data will be the object containing the transaction data
    constructor(data){
        this.hash = null;                                           // Hash of the block
        this.height = 0;                                            // Block Height (consecutive number of each block)
        this.body = Buffer.from(JSON.stringify(data)).toString('hex');   // Will contain the transactions stored in the block, by default it will encode the data
        this.time = 0;                                              // Timestamp for the Block creation
        this.previousBlockHash = null;                              // Reference to the previous Block Hash
    }
    

     
    validate() {
        let self = this;
        return new Promise((resolve, reject) => {
            // Save in auxiliary variable the current block hash
                        let currentHash=  self.hash                  
            // Recalculate the hash of the Block
         let  newHash =SHA256(JSON.stringify(self))
            // Comparing if the hashes changed
            if(newHash===currentHash){
resolve("Block is valid")

            }else{
            // Returning the Block is not valid
            reject("Block is not valid")
            }
            // Returning the Block is valid

        });
    }

    
    getBData() {
        let self = this;
        // Getting the encoded data saved in the Block
        // Decoding the data to retrieve the JSON representation of the object
        // Parse the data to an object to be retrieve.
let data=hex2ascii(self)
        // Resolve with the data if the object isn't the Genesis block
        let object=JSON.parse(data)
        return new Promise((resolve, reject) => {
if(self.previousBlockHash==!null){
resolve(object)

        }else{reject()

    }
        

    });
}
}
    
module.exports.Block = Block;

当我运行服务器时，我在控制台中没有收到任何警告，我在此处附加了一个针对该问题的存储库：https ://github.com/Mai9550/privateBlockchain2

标签： javascriptnode.jsblockchain

解决方案

在getBlockByHeight()in 中BlockchainController.js，您正在为

/block/height/:height

这将不会处理以下请求：

/block/0

路线代码正在等待

/block/height/0

因此，您要么从客户端请求错误的 URL，要么您的服务器代码配置了错误的路由规范。

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