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Nsq源码学习笔记（一）----nsqd启动.html
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<h1 class="post-title" itemprop="name headline">Nsq源码学习笔记（一）----nsqd启动</h1>
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2018-06-08
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<p>nsqd启动代码学习
<br>
<a id="more"></a>
</p>
<h4 id="版本：1-0-1-alpha">
<a href="#版本：1-0-1-alpha" class="headerlink" title="版本：1.0.1-alpha"></a>版本：1.0.1-alpha</h4>
<h3 id="入口">
<a href="#入口" class="headerlink" title="入口"></a>入口</h3>
<p>nsqd的入口代码位于：
<code>$GOPATH//github.com/nsqio/nsq/apps/nsqd/nsqd.go</code>
</p>
<p>nsqd代码在
<code>$GOPATH//github.com/nsqio/nsq/nsqd</code>
</p>
<h3 id="main函数">
<a href="#main函数" class="headerlink" title="main函数"></a>main函数</h3>
<p>入口函数就是
<code>main</code>
</p>
<p>
<code>main</code> 一共4行，run一个
<code>program.Start</code>直到收到结束信息（Control+C或是kill）</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre>
</td>
<td class="code">
<pre><span class="line">prg := &program{}</span><br><span class="line"><span class="keyword">if</span> err := svc.Run(prg, syscall.SIGINT, syscall.SIGTERM); err != <span class="literal">nil</span> {</span><br><span class="line"> log.Fatal(err)</span><br><span class="line">}</span><br></pre>
</td>
</tr>
</table>
</figure>
<h3 id="启动过程">
<a href="#启动过程" class="headerlink" title="启动过程"></a>启动过程</h3>
<p>
<code>program.Start</code> 就是启动的主要内容分别如下：</p>
<ul>
<li>
<a href="#参数解析">解析参数，存入opts</a>
</li>
<li>通过opts new一个nsqd</li>
<li>加载数据，指的是从本地文件加载topic和topic的channel</li>
<li>保存数据回本地文件</li>
<li>进入nsqd.Main</li>
</ul>
<h4 id="参数解析">
<a href="#参数解析" class="headerlink" title="参数解析"></a>参数解析</h4>
<p>参数解析使用的是go自带的
<code>flag</code>包，解析
<code>nsqd --help</code>中参数，其中
<code>options.Resolve(opts, flagSet, cfg)</code>作用还不能确定，稍后补上</p>
<h4 id="通过opts-new一个nsqd">
<a href="#通过opts-new一个nsqd" class="headerlink" title="通过opts new一个nsqd"></a>通过opts new一个nsqd</h4>
<p>如果通过options创建一个nsqd，首先看一下nsqd结构</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre>
</td>
<td class="code">
<pre><span class="line"><span class="keyword">type</span> NSQD <span class="keyword">struct</span> {</span><br><span class="line"> <span class="comment">// 64bit atomic vars need to be first for proper alignment on 32bit platforms</span></span><br><span class="line"> clientIDSequence <span class="keyword">int64</span></span><br><span class="line"></span><br><span class="line"> sync.RWMutex</span><br><span class="line"></span><br><span class="line"> opts atomic.Value</span><br><span class="line"></span><br><span class="line"> dl *dirlock.DirLock <span class="comment">// 本地数据文件目录的锁</span></span><br><span class="line"> isLoading <span class="keyword">int32</span> <span class="comment">// 是否处于加载本地数据过程中</span></span><br><span class="line"> errValue atomic.Value</span><br><span class="line"> startTime time.Time <span class="comment">// 启动时间</span></span><br><span class="line"></span><br><span class="line"> topicMap <span class="keyword">map</span>[<span class="keyword">string</span>]*Topic <span class="comment">// 所有topic存储在这里</span></span><br><span class="line"></span><br><span class="line"> lookupPeers atomic.Value</span><br><span class="line"></span><br><span class="line"> tcpListener net.Listener</span><br><span class="line"> httpListener net.Listener</span><br><span class="line"> httpsListener net.Listener</span><br><span class="line"> tlsConfig *tls.Config <span class="comment">// tls配置信息</span></span><br><span class="line"></span><br><span class="line"> poolSize <span class="keyword">int</span></span><br><span class="line"></span><br><span class="line"> notifyChan <span class="keyword">chan</span> <span class="keyword">interface</span>{}</span><br><span class="line"> optsNotificationChan <span class="keyword">chan</span> <span class="keyword">struct</span>{}</span><br><span class="line"> exitChan <span class="keyword">chan</span> <span class="keyword">int</span> <span class="comment">// 退出信号</span></span><br><span class="line"> waitGroup util.WaitGroupWrapper</span><br><span class="line"></span><br><span class="line"> ci *clusterinfo.ClusterInfo</span><br><span class="line">}</span><br></pre>
</td>
</tr>
</table>
</figure>
<p>结构中每个属性的意义和作用，随着创建和启动逐步完善
<br>创建nsqd实例前先做了两件事：</p>
<ul>
<li>首先检查了是否指定了
<code>data-path</code>，如果没有使用当前目录，为什么创建实例前一定要确定目录，稍后提到</li>
<li>给options创建了一个Logger，为什么不是给nsqd增加Logger而是给了options，还有怎么使用，稍后需要注意一下。(填坑：nsqd专门创建logger函数，内部使用的就是options.Logger，对外的实现是n.logf)</li>
</ul>
<p>创建实例，nsqd没有一次创建所有属性</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre>
</td>
<td class="code">
<pre><span class="line">n := &NSQD{</span><br><span class="line"> startTime: time.Now(), <span class="comment">// 当前时间，也就是启动时间</span></span><br><span class="line"> topicMap: <span class="built_in">make</span>(<span class="keyword">map</span>[<span class="keyword">string</span>]*Topic), <span class="comment">// 这个很关键了，需要下次专门介绍，用于保存所有topic的结构</span></span><br><span class="line"> exitChan: <span class="built_in">make</span>(<span class="keyword">chan</span> <span class="keyword">int</span>), <span class="comment">// 退出信号</span></span><br><span class="line"> notifyChan: <span class="built_in">make</span>(<span class="keyword">chan</span> <span class="keyword">interface</span>{}), <span class="comment">// 还不知道，稍后填坑</span></span><br><span class="line"> optsNotificationChan: <span class="built_in">make</span>(<span class="keyword">chan</span> <span class="keyword">struct</span>{}, <span class="number">1</span>), <span class="comment">// 不知道，稍后填坑</span></span><br><span class="line"> dl: dirlock.New(dataPath), <span class="comment">// 上面提到的数据目录，为了防止多个进程使用同一个目录，需要对目录加锁，稍后详细提到</span></span><br><span class="line">}</span><br></pre>
</td>
</tr>
</table>
</figure>
<p>初始化http api client
<code>n.ci = clusterinfo.New(n.logf, httpcli)</code>,同时日志输出保持一致</p>
<p>指定日志输出等级
<code>opts.logLevel, err = lg.ParseLogLevel(opts.LogLevel, opts.Verbose)</code>
</p>
<p>给数据目录上锁，应该是独占锁，保证其他进程不能在上锁，Ulock动作在Exit才执行，也就是说整个进程执行期间，都是锁住的</p>
<p>接下来是一些参数检查，和tls配置检查
<br>然后返回整个nsqd的实例</p>
<h4 id="加载本地数据">
<a href="#加载本地数据" class="headerlink" title="加载本地数据"></a>加载本地数据</h4>
<p>
<code>nsqd.LoadMetadata()</code>从本地文件加载数据
<br>文件加载过程专门使用atomic标示加载过程</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br></pre>
</td>
<td class="code">
<pre><span class="line">atomic.StoreInt32(&n.isLoading, <span class="number">1</span>)</span><br><span class="line"><span class="keyword">defer</span> atomic.StoreInt32(&n.isLoading, <span class="number">0</span>)</span><br></pre>
</td>
</tr>
</table>
</figure>
<p>应该是为了兼容老的版本，加载的时候需要加载两个文件，其中一个包含ID信息是老版本的文件，读取两个文件后进行比对，如果不一致，返回错误，要求删除其中一个。如果只有一个文件，则只加载该文件的数据，数据的格式是json,内容是这个样子</p>
<figure class="highlight json">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre>
</td>
<td class="code">
<pre><span class="line">{</span><br><span class="line"> <span class="attr">"topics"</span>: [</span><br><span class="line"> {</span><br><span class="line"> <span class="attr">"channels"</span>: [</span><br><span class="line"> {</span><br><span class="line"> <span class="attr">"name"</span>: <span class="string">"ch1"</span>,</span><br><span class="line"> <span class="attr">"paused"</span>: <span class="literal">false</span></span><br><span class="line"> }</span><br><span class="line"> ],</span><br><span class="line"> <span class="attr">"name"</span>: <span class="string">"tp1"</span>,</span><br><span class="line"> <span class="attr">"paused"</span>: <span class="literal">false</span></span><br><span class="line"> }</span><br><span class="line"> ],</span><br><span class="line"> <span class="attr">"version"</span>: <span class="string">"1.0.1-alpha"</span></span><br><span class="line">}</span><br></pre>
</td>
</tr>
</table>
</figure>
<h4 id="保存数据回本地文件">
<a href="#保存数据回本地文件" class="headerlink" title="保存数据回本地文件"></a>保存数据回本地文件</h4>
<p>topics在每次创建/删除是都会同步到文件，添加或删除channels也会同步到文件，使用的的方法就是
<code>PersistMetadata</code>,以后这详细介绍如何触发保存到文件动作，这里只是简单介绍一下保存过程中主要做了哪些事</p>
<p>主要分为两个部分</p>
<ul>
<li>嵌套循环topic 和 topic内的channel，写入文件</li>
<li>通过创建tmp文件，在rename方式写入数据，然后再创建一个软连接</li>
</ul>
<h5 id="第一个部分是获取元数据">
<a href="#第一个部分是获取元数据" class="headerlink" title="第一个部分是获取元数据"></a>第一个部分是获取元数据</h5>
<p>遍历nsq.topicMap, topicMap是目前我认为最重要的结构，主要的数据都保存在这个结构中。遍历topicMap中的每一个topic，只取出topic的name和paused两个属性值保存下来，然后便利topic.channelMap同样只取出name和paused连个属性，在这两层循环中都判断了是否是临时的，ephemeral这个以后还会见到很多次，topic或是channel的name中带有
<code>#ephemeral</code>都被认为是临时的，不会读取，也不会保存。取出所有topic和channel后序列化成json保存入临时文件。</p>
<h5 id="临时文件和软连接">
<a href="#临时文件和软连接" class="headerlink" title="临时文件和软连接"></a>临时文件和软连接</h5>
<p>写临时文件然后在rename到真正要保存的文件名，这个属于标准流程，肯定不能直接写目标文件，万一出错或发生意外避免影响到源文件/目标文件，写入成功后在rename安全多了。</p>
<p>为什么创建软连接，其实上面加载过程中加载的两个文件就来源于这里，如果是软连接，读出来的内容自然一样，看来还是为了兼容以前的版本。</p>
<p>做完上面的事，就要进入真正的启动和监听部分
<code>nsq.Main</code>
</p>
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