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      "body": "Congratulations @qixing! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@qixing/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@qixing) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=qixing)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/the-steem-community-has-lost-an-epic-member-farewell-woflhart\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmQWnM36SWCPGn98nY83M1ArgweMz5fnovQEp2E4FiDdug/Wolfhart_header.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/the-steem-community-has-lost-an-epic-member-farewell-woflhart\">The Steem community has lost an epic member! Farewell @woflhart!</a></td></tr><tr><td><a href=\"https://steemit.com/steemtoolbar/@steemitboard/steemtoolbar-update-display-bug-fixed\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemtoolbar/@steemitboard/steemtoolbar-update-display-bug-fixed\">SteemitBoard - Witness Update</a></td></tr><tr><td><a href=\"https://steemit.com/steem/@steemitboard/do-not-miss-the-coming-rocky-mountain-steem-meetup-and-get-a-new-community-badge\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmUphCGZFWgt6bJ1XTtunV7esnwy6bxnGqcLcHAV3NEqnQ/meetup-rocky-mountain.png\"></a></td><td><a href=\"https://steemit.com/steem/@steemitboard/do-not-miss-the-coming-rocky-mountain-steem-meetup-and-get-a-new-community-badge\">Do not miss the coming Rocky Mountain Steem Meetup and get a new community badge!</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "Congratulations @qixing! You have completed the following achievement on Steemit and have been rewarded with new badge(s) :\n\n[![](https://steemitimages.com/70x70/http://steemitboard.com/notifications/firstcommented.png)](http://steemitboard.com/@qixing) You got a First Reply\n\n<sub>_Click on the badge to view your Board of Honor._</sub>\n<sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub>\n\n\n\n**Do not miss the last post from @steemitboard:**\n[SteemitBoard World Cup Contest - The results, the winners and the prizes](https://steemit.com/steemitboard/@steemitboard/steemitboard-world-cup-contest-the-results-and-prizes)\n\n> Do you like [SteemitBoard's project](https://steemit.com/@steemitboard)? Then **[Vote for its witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1)** and **get one more award**!",
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      "body": "open a cmd windows, and type  the following commands:\nset Path=\"C:\\Program Files\\Oracle\\VirtualBox\";%Path%\nvboxmanage modifymedium disk abb.vdi --resize 131072\nfor %x in (Snapshots\\*.vdi) do vboxmanage modifymedium disk \"%x\" --resize 131072",
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      "title": "",
      "body": "great work. So the shortage of bitshares is too few people are really using the dex.",
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      "body": "表面上可以让大家来评评理，要清醒地认识到实际上没有任何道理可讲，打得赢才是硬道理",
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      "body": "✅  @qixing, I gave you an upvote on your post! **Please give me a follow** and I will give you a follow in return and possible future votes!<br><br>Thank you in advance!",
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      "body": "<html>\n<p>Bitshares-core 源代码使用c++开发，由于代码量比较多，项目复杂，只用文本编辑器来浏览代码是肯定不够的。在浏览代码的过程中经常需要来回跳转，查找声明和引用，而且要充分理解源码，在阅读的过程中，我们应该还会尝试修改部分代码，并重新编译看看有什么改变。</p>\n<p>windows平台下，bitshares-core 目前只支持使用visual studio 2015 update 3进行编译，visual studio 2017 编译不了（开发者已经确认是ide自身的bug,并反馈给微软了，但是别人好像比较高冷，一直没解决这个问题）。</p>\n<p>windows下要自己下载boost openssl 等库的源码，并进行编译，还需要安装cmake、perl等工具。</p>\n<p>windows平台下用msys2 &nbsp;中的gcc进行编译，我也尝试过了，最后失败了，失败的原因是mingw-gcc在连接生成二进制代码时报代码段过多的错误，超出了限制。（具体原因我没有深究，因为这确实超出了我的技术能力，我只想好好生生地看会bitshares源代码）所以我建议，如果你不是特别有时间，也不要折腾在msys2环境下编译bitshares了。</p>\n<p>linux下，我最开始用的是ubuntu 16.04 ，配置过程见我的博客http://www.cwyyprog.com/2017/08/18/ubuntu-%E4%B8%8B%E4%BD%BF%E7%94%A8vs-code-%E9%98%85%E8%AF%BBbitshares-core-%E6%BA%90%E7%A0%81%E7%9A%84%E9%85%8D%E7%BD%AE/</p>\n<p>现在我用的是manjaro发行版本，主要是方便，可以安装最新的软件。</p>\n<p>安装好manjaro后，需要：</p>\n<p>先执行命令: sudo pacman -S base-devel cmake clang boost openssl</p>\n<p>然后安装visual studio code&nbsp;</p>\n<p>克隆源代码 git clone https://github.com/bitshares/bitshares-core.git</p>\n<p>进入bitshares-core 目录 cd bitshares-core</p>\n<p>切换到develop分支 git checkout develop</p>\n<p>克隆子模块源代码 git submodule foreach --recursive git pull origin master</p>\n<p>最后可以用viusal studio code 打开bitshares-core 目录，安装必要的插件(ms-vscode.cpptools)，并设置好include directory就可以开始浏览了。</p>\n<p>c_cpp_properites.json 内容如下：</p>\n<p>{<br>\n \"configurations\": [<br>\n &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>\n \"name\": \"Linux\",<br>\n \"browse\": {<br>\n \"path\": [<br>\n \"${workspaceFolder}\"<br>\n &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;],<br>\n \"limitSymbolsToIncludedHeaders\": true<br>\n &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;},<br>\n \"includePath\": [<br>\n \"${workspaceFolder}\",<br>\n \"${workspaceRoot}/libraries\",<br>\n \"${workspaceRoot}/libraries/app/include\",<br>\n \"${workspaceRoot}/libraries/chain/include\",<br>\n \"${workspaceRoot}/libraries/db/include\",<br>\n \"${workspaceRoot}/libraries/egenesis/include\",<br>\n \"${workspaceRoot}/libraries/fc/include\",<br>\n \"${workspaceRoot}/libraries/net/include\",<br>\n \"${workspaceRoot}/libraries/plugins/include\",<br>\n \"${workspaceRoot}/libraries/utilities/include\",<br>\n \"${workspaceRoot}/libraries/wallet/include\"<br>\n <br>\n &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;],<br>\n \"defines\": [],<br>\n \"compilerPath\": \"/usr/bin/clang\",<br>\n \"cStandard\": \"c11\",<br>\n \"cppStandard\": \"c++11\",<br>\n \"intelliSenseMode\": \"clang-x64\"<br>\n &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>\n &nbsp;&nbsp;&nbsp;],<br>\n \"version\": 4<br>\n}</p>\n</html>",
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      "permlink": "2rcfzo-bitshares",
      "title": "bitshares 比特股源码阅读笔记（三）",
      "body": "比特股重节点，也称重钱包，英文名称witness-node，无疑是比特股网络的核心。比特股内盘区块链中的区块生成，就是由见证人运行的witness_node生产的。\nwitness_node编译为一个单独的可执行文件，其main函数在programs\\witness_node 目录下，在main函数当中，我们并不能看到太多有用的信息。因为bitshares-core 项目提供了一个应用框架（application）类，和一些插件接口（plugin)来访问bitshares区块网络和区块链数据库。witness_node实际就是一个启用了witness plugin的application的实例。\napplication 类位于命名空间graphene::app下，其重要的成员和方法有：\n一个指向区块链数据库实例的智能共享指针\n一个指向p2p网络节点的智能共享指针\n插件的注册，启用，初始化，关闭等功能的接口\n客户端访问api的权限设置方法\n一个表示本地节点是否同步完毕的信号和方法\nappliation 采用了桥接设计模式，以上接口和方法的真实实现其实都在graphene::app::detail::application_impl类当中。重钱包的websocket server 的智能指针就存放于application_impl类当中。\n\nwitness_node 的区块产生循环位于libraries\\plugins\\witness\\witness.cpp文件中。witness区块生成循环启动时的堆栈调用过程：main()->node.startup()->application.startup_plugins()->witness_plugin.plugin_startup()-> schedule_production_loop()\n\nschedule_production_loop()中使用到多线程，通过bitshares-fc 提供的基于promise/future的异步通信机制来与新线程通信。bitshares-fc后台是使用boost的多线程实现，只不过自己加了层封装。 schedule_production_loop()异步调用witness_plugin::block_production_loop()生成区块。witness_plugin::block_production_loop()生成区块后，又调用schedule_production_loop()，这样就构成了一个循环。循环周期在一秒左右。\nblock_production_loop()调用maybe_produce_block()检测是否可以并生成区块。\n\nmaybe_produce_block 先检查区块是否已经完成同步，然后检测是否已经到生成新区块的时间，如果是，则再检查当前轮先的见证人私钥是否在本地节点中，检测本地节点正常区块生成率是否高于33%，检测当前时间是否已经比预计的时间晚了500ms,最后生成新的区块并异步广播。",
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      "permlink": "2pyrfz-bitshares",
      "title": "bitshares 比特股源码阅读笔记（二）",
      "body": "比特股底层相关代码均在libraries目录下，libraries目录下有10个模块。\n其中fc模块，包含与协议无关的代码。 FC全称是：fast comipling\nFC提供的功能主要有：\n1、协程支持\n2、对boost ASIO提供一个同步封装\n3、C++ 反射支持，提供结构体的二进制 、json序列化服务\n4、json rpc的原子化操作反射接口，保证数据致性\n5、加密、解密算法工具,封装了openssl\n6、日志服务\n7、封装其他boost服务\n8、非官方boost.process 库支持\n\nFC库基本上封装了比特股源码所有用到的系统api，fc库可以算是对C++没有一个大而全的标准库的一个补充，fc作为一个大而全的库，应该也可以在其他程序上使用， 但是文档太少了，差评！\n\nFC库依赖于boost库，曾经bitshares只支持boost 1.60以下的版本就是因为fc库的代码过于陈旧，后来陈旧代码被清理了，现在最新版本(master分支)里的fc库已经支持boost 1.67了。\n\n\n与比特股协议紧密最相关的应该是chain模块里面的代码。\nchain模块里面定义了账户，资产，区块等比特投世界里面的所有对象，所有对象的定义在chain/protocol目录里",
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      "body": "比特股在设计上采用了与比特币uxto完全不同的方式。它采用的是传统会计账户模式。\n即每个账户对于每个资产都有一个余额。\n账户之间转账就是资产余额的加减。\n账户，资产都是一种object的孙子类 ,直接继承自abstract_object，而abstract_object继承自object.\n每个object有一个全局唯一的id，object之间只能通过id来相互标识和访问。\n每个 id是object_id特例化后的类的实例， 每个id由3个整数组成 ，前面两个是8位无符号整数，后面一个64位无符号整数，但是最大值不超过2的48次方。\n每个账户都有两种权限authority,一个所有权，一个authority代表活动权(先把它想象成经营权或者管理权吧)\n\n每个authority可以由多个执行者来实行，每个执行者可以有不同的权重。执行者可以是公钥、地址、或者其他账户。\n\n谈谈个人感受：\n1、我觉得比特股源码里，authority 方面的名字没起好，不够直观。\n2、object_id的设计，虽然看上去很新奇，我现在还找不出为什么要这样设计？为了性能还是其他方面的考虑，简单的自曾id已经在工程上被证明不是一个好的设计。为了方便记忆的话，每个object已经有一个名字了。而且我觉得这方面明明有url的规范啊，为什么不用呢？直接定义一种url来访问不是更好吗？例如通过\nbitshares://asserts/bitcny来获取bitcny的信息，bitshares://accounts/sb来获取sb账户的信息，这样是不是更直观，而容易被大家接受啊\n3、大量使用了struct 来替代class ,虽然 c++中，这两个东西基本上是同一个东西，但是这确实不太容易让新人接受，毕竟大多数c++资料上都是用class来定义类的\n4、大量使用了模板，如果你熟悉C++模板带来的元编程，那么对你来说，代码可读性和可维护性确实是不太好！估计这也是C++是日薄西山的原因之一吧，毕竟在C++搞模板进行元编程的年代，PL界里类型系统好像还不是很成熟。如果把bitshares的源代码换成rust来写，可读性，可维护性应该会不会更高些？毕竟他号称集软件工程15年来的最佳工程实践。\n5、文档还是太少了\n\n当然我要承认自己写c++写得很少，以上观点也肯定有些错误和不足，还是报着学习的心态多看看源代码。",
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