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<li>&#x4E0D;&#x80FD;&#x51FA;&#x73B0;&#x8282;&#x70B9;down&#x6389;&#x540E;&#x52A0;&#x9501;&#x5931;&#x8D25;</li>
</ul>
<p><code>go-zero</code> &#x4E2D;&#x5229;&#x7528; redis <code>set key nx</code> &#x53EF;&#x4EE5;&#x4FDD;&#x8BC1;key&#x4E0D;&#x5B58;&#x5728;&#x65F6;&#x5199;&#x5165;&#x6210;&#x529F;&#xFF0C;<code>px</code> &#x53EF;&#x4EE5;&#x8BA9;key&#x8D85;&#x65F6;&#x540E;&#x81EA;&#x52A8;&#x5220;&#x9664;&#x300C;&#x6700;&#x574F;&#x60C5;&#x51B5;&#x4E5F;&#x5C31;&#x662F;&#x8D85;&#x65F6;&#x81EA;&#x52A8;&#x5220;&#x9664;key&#xFF0C;&#x4ECE;&#x800C;&#x4E5F;&#x4E0D;&#x4F1A;&#x51FA;&#x73B0;&#x6B7B;&#x9501;&#x300D;</p>
<h2 id="example">example</h2>
<pre class="language-"><code class="lang-go">redisLockKey <span class="token operator">:=</span> fmt<span class="token punctuation">.</span><span class="token function">Sprintf</span><span class="token punctuation">(</span><span class="token string">&quot;%v%v&quot;</span><span class="token punctuation">,</span> redisTpl<span class="token punctuation">,</span> headId<span class="token punctuation">)</span>
<span class="token comment">// 1. New redislock</span>
redisLock <span class="token operator">:=</span> redis<span class="token punctuation">.</span><span class="token function">NewRedisLock</span><span class="token punctuation">(</span>redisConn<span class="token punctuation">,</span> redisLockKey<span class="token punctuation">)</span>
<span class="token comment">// 2. &#x53EF;&#x9009;&#x64CD;&#x4F5C;&#xFF0C;&#x8BBE;&#x7F6E; redislock &#x8FC7;&#x671F;&#x65F6;&#x95F4;</span>
redisLock<span class="token punctuation">.</span><span class="token function">SetExpire</span><span class="token punctuation">(</span>redisLockExpireSeconds<span class="token punctuation">)</span>
<span class="token keyword">if</span> ok<span class="token punctuation">,</span> err <span class="token operator">:=</span> redisLock<span class="token punctuation">.</span><span class="token function">Acquire</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">!</span>ok <span class="token operator">||</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token boolean">nil</span><span class="token punctuation">,</span> errors<span class="token punctuation">.</span><span class="token function">New</span><span class="token punctuation">(</span><span class="token string">&quot;&#x5F53;&#x524D;&#x6709;&#x5176;&#x4ED6;&#x7528;&#x6237;&#x6B63;&#x5728;&#x8FDB;&#x884C;&#x64CD;&#x4F5C;&#xFF0C;&#x8BF7;&#x7A0D;&#x540E;&#x91CD;&#x8BD5;&quot;</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
<span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token function">recover</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token comment">// 3. &#x91CA;&#x653E;&#x9501;</span>
  redisLock<span class="token punctuation">.</span><span class="token function">Release</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x548C;&#x4F60;&#x5728;&#x4F7F;&#x7528; <code>sync.Mutex</code> &#x7684;&#x65B9;&#x5F0F;&#x65F6;&#x4E00;&#x81F4;&#x7684;&#x3002;&#x52A0;&#x9501;&#x89E3;&#x9501;&#xFF0C;&#x6267;&#x884C;&#x4F60;&#x7684;&#x4E1A;&#x52A1;&#x64CD;&#x4F5C;&#x3002;</p>
<h2 id="&#x83B7;&#x53D6;&#x9501;">&#x83B7;&#x53D6;&#x9501;</h2>
<pre class="language-"><code class="lang-go">lockCommand <span class="token operator">=</span> <span class="token string">`if redis.call(&quot;GET&quot;, KEYS[1]) == ARGV[1] then
    redis.call(&quot;SET&quot;, KEYS[1], ARGV[1], &quot;PX&quot;, ARGV[2])
    return &quot;OK&quot;
else
    return redis.call(&quot;SET&quot;, KEYS[1], ARGV[1], &quot;NX&quot;, &quot;PX&quot;, ARGV[2])
end`</span>

<span class="token keyword">func</span> <span class="token punctuation">(</span>rl <span class="token operator">*</span>RedisLock<span class="token punctuation">)</span> <span class="token function">Acquire</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token builtin">bool</span><span class="token punctuation">,</span> <span class="token builtin">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    seconds <span class="token operator">:=</span> atomic<span class="token punctuation">.</span><span class="token function">LoadUint32</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>rl<span class="token punctuation">.</span>seconds<span class="token punctuation">)</span>
  <span class="token comment">// execute luascript</span>
    resp<span class="token punctuation">,</span> err <span class="token operator">:=</span> rl<span class="token punctuation">.</span>store<span class="token punctuation">.</span><span class="token function">Eval</span><span class="token punctuation">(</span>lockCommand<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token builtin">string</span><span class="token punctuation">{</span>rl<span class="token punctuation">.</span>key<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token builtin">string</span><span class="token punctuation">{</span>
        rl<span class="token punctuation">.</span>id<span class="token punctuation">,</span> strconv<span class="token punctuation">.</span><span class="token function">Itoa</span><span class="token punctuation">(</span><span class="token function">int</span><span class="token punctuation">(</span>seconds<span class="token punctuation">)</span><span class="token operator">*</span>millisPerSecond <span class="token operator">+</span> tolerance<span class="token punctuation">)</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> err <span class="token operator">==</span> red<span class="token punctuation">.</span>Nil <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
        logx<span class="token punctuation">.</span><span class="token function">Errorf</span><span class="token punctuation">(</span><span class="token string">&quot;Error on acquiring lock for %s, %s&quot;</span><span class="token punctuation">,</span> rl<span class="token punctuation">.</span>key<span class="token punctuation">,</span> err<span class="token punctuation">.</span><span class="token function">Error</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> err
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> resp <span class="token operator">==</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span>

    reply<span class="token punctuation">,</span> ok <span class="token operator">:=</span> resp<span class="token punctuation">.</span><span class="token punctuation">(</span><span class="token builtin">string</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> ok <span class="token operator">&amp;&amp;</span> reply <span class="token operator">==</span> <span class="token string">&quot;OK&quot;</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        logx<span class="token punctuation">.</span><span class="token function">Errorf</span><span class="token punctuation">(</span><span class="token string">&quot;Unknown reply when acquiring lock for %s: %v&quot;</span><span class="token punctuation">,</span> rl<span class="token punctuation">.</span>key<span class="token punctuation">,</span> resp<span class="token punctuation">)</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5148;&#x4ECB;&#x7ECD;&#x51E0;&#x4E2A; <code>redis</code> &#x7684;&#x547D;&#x4EE4;&#x9009;&#x9879;&#xFF0C;&#x4EE5;&#x4E0B;&#x662F;&#x4E3A; <code>set</code> &#x547D;&#x4EE4;&#x589E;&#x52A0;&#x7684;&#x9009;&#x9879;&#xFF1A;</p>
<ul>
<li><code>ex seconds</code> &#xFF1A;&#x8BBE;&#x7F6E;key&#x8FC7;&#x671F;&#x65F6;&#x95F4;&#xFF0C;&#x5355;&#x4F4D;s</li>
<li><code>px milliseconds</code> &#xFF1A;&#x8BBE;&#x7F6E;key&#x8FC7;&#x671F;&#x65F6;&#x95F4;&#xFF0C;&#x5355;&#x4F4D;&#x6BEB;&#x79D2;</li>
<li><code>nx</code>&#xFF1A;key&#x4E0D;&#x5B58;&#x5728;&#x65F6;&#xFF0C;&#x8BBE;&#x7F6E;key&#x7684;&#x503C;</li>
<li><code>xx</code>&#xFF1A;key&#x5B58;&#x5728;&#x65F6;&#xFF0C;&#x624D;&#x4F1A;&#x53BB;&#x8BBE;&#x7F6E;key&#x7684;&#x503C;</li>
</ul>
<p>&#x5176;&#x4E2D; <code>lua script</code> &#x6D89;&#x53CA;&#x7684;&#x5165;&#x53C2;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>args</th>
<th>&#x793A;&#x4F8B;</th>
<th>&#x542B;&#x4E49;</th>
</tr>
</thead>
<tbody>
<tr>
<td>KEYS[1]</td>
<td>key$20201026</td>
<td>redis key</td>
</tr>
<tr>
<td>ARGV[1]</td>
<td>lmnopqrstuvwxyzABCD</td>
<td>&#x552F;&#x4E00;&#x6807;&#x8BC6;&#xFF1A;&#x968F;&#x673A;&#x5B57;&#x7B26;&#x4E32;</td>
</tr>
<tr>
<td>ARGV[2]</td>
<td>30000</td>
<td>&#x8BBE;&#x7F6E;&#x9501;&#x7684;&#x8FC7;&#x671F;&#x65F6;&#x95F4;</td>
</tr>
</tbody>
</table>
<p>&#x7136;&#x540E;&#x6765;&#x8BF4;&#x8BF4;&#x4EE3;&#x7801;&#x7279;&#x6027;&#xFF1A;</p>
<ol>
<li><code>Lua</code> &#x811A;&#x672C;&#x4FDD;&#x8BC1;&#x539F;&#x5B50;&#x6027;&#x300C;&#x5F53;&#x7136;&#xFF0C;&#x628A;&#x591A;&#x4E2A;&#x64CD;&#x4F5C;&#x5728; Redis &#x4E2D;&#x5B9E;&#x73B0;&#x6210;&#x4E00;&#x4E2A;&#x64CD;&#x4F5C;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x5355;&#x547D;&#x4EE4;&#x64CD;&#x4F5C;&#x300D;</li>
<li>&#x4F7F;&#x7528;&#x4E86; <code>set key value px milliseconds nx</code></li>
<li><code>value</code> &#x5177;&#x6709;&#x552F;&#x4E00;&#x6027;</li>
<li>&#x52A0;&#x9501;&#x65F6;&#x9996;&#x5148;&#x5224;&#x65AD; <code>key</code> &#x7684; <code>value</code> &#x662F;&#x5426;&#x548C;&#x4E4B;&#x524D;&#x8BBE;&#x7F6E;&#x7684;&#x4E00;&#x81F4;&#xFF0C;&#x4E00;&#x81F4;&#x5219;&#x4FEE;&#x6539;&#x8FC7;&#x671F;&#x65F6;&#x95F4;</li>
</ol>
<h2 id="&#x91CA;&#x653E;&#x9501;">&#x91CA;&#x653E;&#x9501;</h2>
<pre class="language-"><code class="lang-go">delCommand <span class="token operator">=</span> <span class="token string">`if redis.call(&quot;GET&quot;, KEYS[1]) == ARGV[1] then
    return redis.call(&quot;DEL&quot;, KEYS[1])
else
    return 0
end`</span>

<span class="token keyword">func</span> <span class="token punctuation">(</span>rl <span class="token operator">*</span>RedisLock<span class="token punctuation">)</span> <span class="token function">Release</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">(</span><span class="token builtin">bool</span><span class="token punctuation">,</span> <span class="token builtin">error</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    resp<span class="token punctuation">,</span> err <span class="token operator">:=</span> rl<span class="token punctuation">.</span>store<span class="token punctuation">.</span><span class="token function">Eval</span><span class="token punctuation">(</span>delCommand<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token builtin">string</span><span class="token punctuation">{</span>rl<span class="token punctuation">.</span>key<span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token builtin">string</span><span class="token punctuation">{</span>rl<span class="token punctuation">.</span>id<span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> err
    <span class="token punctuation">}</span>

    <span class="token keyword">if</span> reply<span class="token punctuation">,</span> ok <span class="token operator">:=</span> resp<span class="token punctuation">.</span><span class="token punctuation">(</span><span class="token builtin">int64</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">!</span>ok <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> reply <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token boolean">nil</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x91CA;&#x653E;&#x9501;&#x7684;&#x65F6;&#x5019;&#x53EA;&#x9700;&#x8981;&#x5173;&#x6CE8;&#x4E00;&#x70B9;&#xFF1A;</p>
<p><strong>&#x4E0D;&#x80FD;&#x91CA;&#x653E;&#x522B;&#x4EBA;&#x7684;&#x9501;&#xFF0C;&#x4E0D;&#x80FD;&#x91CA;&#x653E;&#x522B;&#x4EBA;&#x7684;&#x9501;&#xFF0C;&#x4E0D;&#x80FD;&#x91CA;&#x653E;&#x522B;&#x4EBA;&#x7684;&#x9501;</strong></p>
<p>&#x6240;&#x4EE5;&#x9700;&#x8981;&#x5148; <code>get(key) == value&#x300C;key&#x300D;</code>&#xFF0C;&#x4E3A; true &#x624D;&#x4F1A;&#x53BB; <code>delete</code></p>
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