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Apache-2.0

md_blockchain

Java区块链平台,基于Springboot开发的区块链平台。区块链qq交流群737858576,刚建的群,一起学习区块链平台开发。公司要开发区块链,原本是想着使用以太坊开发个合约或者是使用个第三方平台来做,后来发现都不符合业务需求,公司要求自己开发区块链平台,仅联盟链即可。所以于3月开始研发,历时一月发布了这个版本。基本功能有了,但细节尚不到位。希望高手不吝赐教,来做一个区块链平台项目,适合各种场景,分布式存储,不仅仅是账本。

主要有存储模块、网络模块、加密模块、区块解析入库等。

该区块链平台属于"链",非"币"。主要是做联盟链,用来做分布式存储的,不涉及虚拟币。本质上类似于腾讯区块链项目trustsql。

Block内存储的是类Sql语句,各节点通过达成过半同意后即可生成Block,然后全网广播,拉取Block,然后执行Block内的sql语句。

各节点通过执行相同的sql来实现一个同步的sqlite数据库,将来对数据的查询都是直接查询sqlite,性能高于传统的区块链项目。

适用的场景比较多了,但凡能用sql来表示的都可以,像比特币的账单也完全可以用数据库来存储。

如果因为某些原因导致链分叉了,也提供了回滚机制,sql可以回滚。

使用方法:先启动md_blockchain_manager项目,然后修改application.yml里的name、appid和managerUrl和manager项目数据库里的一一对应,作为一个节点启动即可。

可以通过访问localhost:8080/block?content=1来生成一个区块,至少要启动2个节点才行,生成Block时需要除自己外的至少过半同意才行。生成Block后就会发现别的节点也会自动同步自己新生成的Block。

可以通过localhost:8080/sqlite来查看sqlite里存的数据,就是根据Block里的sql语句执行后的结果。

Block存储采用的是key-value数据库rocksDB,了解比特币的知道,比特币用的是levelDB,都是类似的东西。

区块里存放的是类似于sql的语句,如ADD(增删改) tableName(表名)ID(主键) JSON(该记录的json)。

节点可以根据区块里的这些语句,进而将数据落地,我这里用的内嵌数据库sqlite,当然也支持mysql等数据库,用的jpa,操作sqlite和mysql其实没有任何区别。

网络层,采用的是各节点互相长连接、断线重连,然后维持心跳包。任何一个节点都可以生成Block,不同于比特币的挖矿和其他的需要先选举,他们都是只能由特定的节点来生成区块。我这里可以由任何节点来生成,只要过半同意即可。 生成Block时需要全网广播,等待其他节点的校验(校验格式、hash、签名、和table的权限),校验通过后,过半同意了,就可以构建Block并广播全网,通知各节点更新Block。

我把项目部署到docker里了,共启动4个节点,如图: 输入图片说明

manager就是md_blockchain_manager项目,主要功能就是提供联盟链内各节点ip 输入图片说明

四个节点ip都写死了,都启动后,它们会相互全部连接起来,并维持住长连接和心跳包。 输入图片说明

我调用一下block项目的生成区块接口,http://ip:port/block?content=1

输入图片说明

别的节点会是这样,收到block项目请求生成区块的请求、并开始校验,回复是否同意 输入图片说明

当block项目收到过半的同意后,就开始生成区块,并广播给其他节点自己的新区块,其他节点开始拉取新块,校验通过了则更新到本地。

这个生成区块的接口是写好用来测试的,正常走的流程是调用instuction接口,先生产符合自己需求的指令,然后组合多个指令,调用BlockController里的生成区块接口。

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简介

开源java区块链平台,可做联盟链、私链使用,不适用于公链。各节点已知IP,维持长连接。共识机制采用过半同意即可生成区块。 无虚拟货币,可用于存储各种类型的数据,无需挖矿。不仅仅可以用来做账本,还可以做各种定制化的存储需求。理念来自于腾讯的trustsql。 加密、公钥私钥、网络模块、存储模块等。 展开 收起
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