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<!DOCTYPE html>
<html class="theme-next gemini use-motion" lang="zh-Hans">
<head>
<!-- hexo-inject:begin --><!-- hexo-inject:end --><meta name="generator" content="Hexo 3.8.0">
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
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type="text/css">
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<link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png?v=5.1.4">
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<meta property="og:locale" content="zh-Hans">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="Whyming's Blog">
<script type="text/javascript" id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Gemini',
version: '5.1.4',
sidebar: {
"position": "left",
"display": "always",
"offset": 12,
"b2t": false,
"scrollpercent": false,
"onmobile": false
},
fancybox: true,
tabs: true,
motion: {
"enable": true,
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"transition": {
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},
duoshuo: {
userId: '0',
author: '博主'
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algolia: {
applicationID: '',
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indexName: '',
hits: {
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},
labels: {
"input_placeholder": "Search for Posts",
"hits_empty": "We didn't find any results for the search: ${query}",
"hits_stats": "${hits} results found in ${time} ms"
}
}
};
</script>
<link rel="canonical" href="http://blog.whyming.com/">
<title>Whyming's Blog</title><!-- hexo-inject:begin --><!-- hexo-inject:end -->
</head>
<body itemscope="" itemtype="http://schema.org/WebPage" lang="zh-Hans">
<!-- hexo-inject:begin --><!-- hexo-inject:end --><div class="container sidebar-position-left
page-home">
<div class="headband"></div>
<header id="header" class="header" itemscope="" itemtype="http://schema.org/WPHeader">
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<a href="/" rel="section">
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<br> 首页
</a>
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<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/hystrix-go-introduction.html" itemprop="url">hysteria-go 使用及源码学习</a>
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<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-05-14T12:15:14+08:00">
2019-05-14
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<div class="post-body" itemprop="articleBody">
golang,源码学习
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<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/ARTS-5.html" itemprop="url">ARTS-5</a>
</h1>
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<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-05-05T14:50:56+08:00">
2019-05-05
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<div class="post-body" itemprop="articleBody">
ATRS-5
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<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/ARTS-4.html" itemprop="url">ARTS-第四周</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-05-05T14:43:37+08:00">
2019-05-05
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</header>
<div class="post-body" itemprop="articleBody">
<p>A:
<a href="https://leetcode.com/problems/swap-nodes-in-pairs/" target="_blank" rel="external nofollow noopener noreferrer">Swap Nodes in Pairs</a>
</p>
<p>R:
<a href="https://dimes.github.io/blog/compile-time-di-vs-run-time-di" target="_blank"
rel="external nofollow noopener noreferrer">Compile-time DI vs. Run-time DI</a>
</p>
<p>T:
<a href="./#T: jq 工具使用">jq 工具使用</a>
</p>
<p>S:</p>
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<meta itemprop="name" content="Whyming's Blog">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/ARTS-3.html" itemprop="url">ARTS-第三周</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-04-21T21:33:35+08:00">
2019-04-21
</time>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p>ARTS打卡第三周</p>
<p>A:
<a href="https://leetcode.com/problems/letter-combinations-of-a-phone-number/" target="_blank"
rel="external nofollow noopener noreferrer">
Letter Combinations of a Phone Number</a>
</p>
<p>R:Why you should like sync.Pool</p>
<p>T: 利用闭包构构造类型一致的不同错误</p>
<p>S: –</p>
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</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a class="post-title-link" href="/ARTS-2.html" itemprop="url">ARTS-第二周</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建于" itemprop="dateCreated datePublished" datetime="2019-04-14T09:27:30+08:00">
2019-04-14
</time>
</span>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<p>ARTS打卡第二周</p>
<p>A: leetcode 3Sum， Midum</p>
<p>R：http断点续传协议TUS</p>
<p>T: 利用git commit 回滚代码，阅读庞大项目</p>
<p>S：go-nats代码阅读</p>
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<p>
<a href="https://www.zhihu.com/question/301150832" target="_blank" rel="external nofollow noopener noreferrer">《左耳听风》发起的ARTS挑战</a>
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<blockquote>
<p>
<strong>Algorithm</strong>。
<strong>主要是为了编程训练和学习。</strong>每周至少做一个 leetcode 的算法题（先从Easy开始，然后再Medium，最后才Hard）。进行编程训练，如果不训练你看再多的算法书，你依然不会做算法题，看完书后，你需要训练。关于做Leetcode的的优势，你可以看一下我在coolshell上的文章
<a href="https://link.zhihu.com/?target=https%3A//coolshell.cn/articles/12052.html"
target="_blank" rel="external nofollow noopener noreferrer">Leetcode 编程训练 - 酷 壳 - CoolShell</a>。</p>
<p>
<strong>Review：主要是为了学习英文，如果你的英文不行，你基本上无缘技术高手。</strong>所以，需要你阅读并点评至少一篇英文技术文章，我个人最喜欢去的地方是
<a href="https://link.zhihu.com/?target=http%3A//Medium.com" target="_blank" rel="external nofollow noopener noreferrer">http://Medium.com</a>（需要梯子）以及各个公司的技术blog，如Netflix的。</p>
<p>
<strong>Tip：主要是为了总结和归纳你在是常工作中所遇到的知识点</strong>。学习至少一个技术技巧。你在工作中遇到的问题，踩过的坑，学习的点滴知识。</p>
<p>
<strong>Share：主要是为了建立你的影响力，能够输出价值观。</strong>分享一篇有观点和思考的技术文章。</p>
<p>作者：陈皓</p>
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<a class="post-title-link" href="/Nsq源码学习笔记-二-nsqd消息订阅.html" itemprop="url">Nsq源码学习笔记(二) --- nsqd消息订阅</a>
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<p>nsqd.Main内部逻辑很少，启动了6个goroutine，下面简单说一下goroutine的作用</p>
<ul>
<li>tcpserver，监听客户端连接，很重要，下面消息订阅就是在这里面发生的</li>
<li>httpserver，监听http请求，提供rest api 服务</li>
<li>httpsserver，监听https请求，其实和http的一样</li>
<li>queueScanLoop，应该是监听消息队列的，稍后回来填坑</li>
<li>lookupLoop ，和nsqlookupd通信的</li>
<li>statsdLoop， 状态同步</li>
</ul>
<h4 id="tcpserver-获取订阅消息">
<a href="#tcpserver-获取订阅消息" class="headerlink" title="tcpserver 获取订阅消息"></a>tcpserver 获取订阅消息</h4>
<p>连接成功后，立刻读取前4个字节，
<code>[ ][ ][V][2]</code>,前两个空格应该是预留，这个是用来判断通信协议版本的，目前只有V2,</p>
<p>然后开始
<code>prot.IOLoop</code>, 这个是tcpserver最主要的事情了， 里面也主要包含两部分</p>
<ul>
<li>启动
<code>messagePump</code>,这是一个goroutine，处理消息转发等</li>
<li>循环读取client发来的消息，解析成命令并执行，同时还包含了维护心跳</li>
</ul>
<p>
<code>messagePump</code>通过循环读取多个chan来实现消息读取，事件触发，其中就包含对订阅消息的转发</p>
<p>当client发送一个
<code>SUB topicName Channel</code>给nsqd时， nsqd在检查topic和channel合法性后，会创建一个新的channel，放入
<code>subEventChan</code>，
<code>messagePump</code>监听并得到这个chan后，会继监听这个chan的消息，一旦这个channel有消息发来，则会将channel的消息转发给client，这样客户端就得到了订阅的消息推送。</p>
<p>channel的消息哪来的呢？原来在topic创建channel的时候，同时会把这channel加入topic的channel列表，当top接受到消息的时候，发送给列表中的每一个channel，这样可以实现一个topic，多个订阅channel都能得到消息。</p>
<p>另外因为topic在创建channel的时候使用的是
<code>getOrCreateChannel</code>从名字看就知道，如果已经存在这个名字的channel则直接返回已经存在的channel，如果不存在才创建。那么如果订阅了一个已经存在的channel，就是说别人也监听了的channel会怎么样呢，这个问题转换成了，如果一个go
channel多出代码读取，将随机的的一个读到消息，所以订阅同一个channel的客户端将随机收到消息。听说这样设计是为了实现客户端的均衡，可以让多个客户端随机消费同一个channel
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<p>鉴于官方手册并不是每个方法都给出了example，描述有很多也不是很清楚，所以光从doc是不能完全理解这个库，还是要动起手来</p>
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<p>使用go中遇到的小问题，记录和回顾用
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