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                                <h1 id="tokenlimit">tokenlimit</h1>
<p>&#x672C;&#x8282;&#x5C06;&#x901A;&#x8FC7;&#x4EE4;&#x724C;&#x6876;&#x9650;&#x6D41;&#xFF08;tokenlimit&#xFF09;&#x6765;&#x4ECB;&#x7ECD;&#x5176;&#x57FA;&#x672C;&#x4F7F;&#x7528;&#x3002;</p>
<h2 id="&#x4F7F;&#x7528;">&#x4F7F;&#x7528;</h2>
<pre class="language-"><code class="lang-go"><span class="token keyword">const</span> <span class="token punctuation">(</span>
    burst   <span class="token operator">=</span> <span class="token number">100</span>
    rate    <span class="token operator">=</span> <span class="token number">100</span>
    seconds <span class="token operator">=</span> <span class="token number">5</span>
<span class="token punctuation">)</span>

store <span class="token operator">:=</span> redis<span class="token punctuation">.</span><span class="token function">NewRedis</span><span class="token punctuation">(</span><span class="token string">&quot;localhost:6379&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;node&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;&quot;</span><span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span>store<span class="token punctuation">.</span><span class="token function">Ping</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token comment">// New tokenLimiter</span>
limiter <span class="token operator">:=</span> limit<span class="token punctuation">.</span><span class="token function">NewTokenLimiter</span><span class="token punctuation">(</span>rate<span class="token punctuation">,</span> burst<span class="token punctuation">,</span> store<span class="token punctuation">,</span> <span class="token string">&quot;rate-test&quot;</span><span class="token punctuation">)</span>
timer <span class="token operator">:=</span> time<span class="token punctuation">.</span><span class="token function">NewTimer</span><span class="token punctuation">(</span>time<span class="token punctuation">.</span>Second <span class="token operator">*</span> seconds<span class="token punctuation">)</span>
quit <span class="token operator">:=</span> <span class="token function">make</span><span class="token punctuation">(</span><span class="token keyword">chan</span> <span class="token keyword">struct</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token keyword">defer</span> timer<span class="token punctuation">.</span><span class="token function">Stop</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">go</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 operator">&lt;-</span>timer<span class="token punctuation">.</span>C
  <span class="token function">close</span><span class="token punctuation">(</span>quit<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

<span class="token keyword">var</span> allowed<span class="token punctuation">,</span> denied <span class="token builtin">int32</span>
<span class="token keyword">var</span> wait sync<span class="token punctuation">.</span>WaitGroup
<span class="token keyword">for</span> i <span class="token operator">:=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> runtime<span class="token punctuation">.</span><span class="token function">NumCPU</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> i<span class="token operator">++</span> <span class="token punctuation">{</span>
  wait<span class="token punctuation">.</span><span class="token function">Add</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
  <span class="token keyword">go</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 keyword">for</span> <span class="token punctuation">{</span>
      <span class="token keyword">select</span> <span class="token punctuation">{</span>
        <span class="token keyword">case</span> <span class="token operator">&lt;-</span>quit<span class="token punctuation">:</span>
          wait<span class="token punctuation">.</span><span class="token function">Done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
          <span class="token keyword">return</span>
        <span class="token keyword">default</span><span class="token punctuation">:</span>
          <span class="token keyword">if</span> limiter<span class="token punctuation">.</span><span class="token function">Allow</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            atomic<span class="token punctuation">.</span><span class="token function">AddInt32</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>allowed<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span>
          <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
            atomic<span class="token punctuation">.</span><span class="token function">AddInt32</span><span class="token punctuation">(</span><span class="token operator">&amp;</span>denied<span class="token punctuation">,</span> <span class="token number">1</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><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

wait<span class="token punctuation">.</span><span class="token function">Wait</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">&quot;allowed: %d, denied: %d, qps: %d\n&quot;</span><span class="token punctuation">,</span> allowed<span class="token punctuation">,</span> denied<span class="token punctuation">,</span> <span class="token punctuation">(</span>allowed<span class="token operator">+</span>denied<span class="token punctuation">)</span><span class="token operator">/</span>seconds<span class="token punctuation">)</span>
</code></pre>
<h2 id="tokenlimit">tokenlimit</h2>
<p>&#x4ECE;&#x6574;&#x4F53;&#x4E0A;&#x4EE4;&#x724C;&#x6876;&#x751F;&#x4EA7;token&#x903B;&#x8F91;&#x5982;&#x4E0B;&#xFF1A;</p>
<ul>
<li>&#x7528;&#x6237;&#x914D;&#x7F6E;&#x7684;&#x5E73;&#x5747;&#x53D1;&#x9001;&#x901F;&#x7387;&#x4E3A;r&#xFF0C;&#x5219;&#x6BCF;&#x9694;1/r&#x79D2;&#x4E00;&#x4E2A;&#x4EE4;&#x724C;&#x88AB;&#x52A0;&#x5165;&#x5230;&#x6876;&#x4E2D;&#xFF1B;</li>
<li>&#x5047;&#x8BBE;&#x6876;&#x4E2D;&#x6700;&#x591A;&#x53EF;&#x4EE5;&#x5B58;&#x653E;b&#x4E2A;&#x4EE4;&#x724C;&#x3002;&#x5982;&#x679C;&#x4EE4;&#x724C;&#x5230;&#x8FBE;&#x65F6;&#x4EE4;&#x724C;&#x6876;&#x5DF2;&#x7ECF;&#x6EE1;&#x4E86;&#xFF0C;&#x90A3;&#x4E48;&#x8FD9;&#x4E2A;&#x4EE4;&#x724C;&#x4F1A;&#x88AB;&#x4E22;&#x5F03;&#xFF1B;</li>
<li>&#x5F53;&#x6D41;&#x91CF;&#x4EE5;&#x901F;&#x7387;v&#x8FDB;&#x5165;&#xFF0C;&#x4ECE;&#x6876;&#x4E2D;&#x4EE5;&#x901F;&#x7387;v&#x53D6;&#x4EE4;&#x724C;&#xFF0C;&#x62FF;&#x5230;&#x4EE4;&#x724C;&#x7684;&#x6D41;&#x91CF;&#x901A;&#x8FC7;&#xFF0C;&#x62FF;&#x4E0D;&#x5230;&#x4EE4;&#x724C;&#x6D41;&#x91CF;&#x4E0D;&#x901A;&#x8FC7;&#xFF0C;&#x6267;&#x884C;&#x7194;&#x65AD;&#x903B;&#x8F91;&#xFF1B;</li>
</ul>
<p><code>go-zero</code> &#x5728;&#x4E24;&#x7C7B;&#x9650;&#x6D41;&#x5668;&#x4E0B;&#x90FD;&#x91C7;&#x53D6; <code>lua script</code> &#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x4F9D;&#x8D56;redis&#x53EF;&#x4EE5;&#x505A;&#x5230;&#x5206;&#x5E03;&#x5F0F;&#x9650;&#x6D41;&#xFF0C;<code>lua script</code>&#x540C;&#x65F6;&#x53EF;&#x4EE5;&#x505A;&#x5230;&#x5BF9; token &#x751F;&#x4EA7;&#x8BFB;&#x53D6;&#x64CD;&#x4F5C;&#x7684;&#x539F;&#x5B50;&#x6027;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x6765;&#x770B;&#x770B; <code>lua script</code> &#x63A7;&#x5236;&#x7684;&#x51E0;&#x4E2A;&#x5173;&#x952E;&#x5C5E;&#x6027;&#xFF1A;</p>
<table>
<thead>
<tr>
<th>argument</th>
<th>mean</th>
</tr>
</thead>
<tbody>
<tr>
<td>ARGV[1]</td>
<td>rate &#x300C;&#x6BCF;&#x79D2;&#x751F;&#x6210;&#x51E0;&#x4E2A;&#x4EE4;&#x724C;&#x300D;</td>
</tr>
<tr>
<td>ARGV[2]</td>
<td>burst &#x300C;&#x4EE4;&#x724C;&#x6876;&#x6700;&#x5927;&#x503C;&#x300D;</td>
</tr>
<tr>
<td>ARGV[3]</td>
<td>now_time&#x300C;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x6233;&#x300D;</td>
</tr>
<tr>
<td>ARGV[4]</td>
<td>get token nums &#x300C;&#x5F00;&#x53D1;&#x8005;&#x9700;&#x8981;&#x83B7;&#x53D6;&#x7684;token&#x6570;&#x300D;</td>
</tr>
<tr>
<td>KEYS[1]</td>
<td>&#x8868;&#x793A;&#x8D44;&#x6E90;&#x7684;tokenkey</td>
</tr>
<tr>
<td>KEYS[2]</td>
<td>&#x8868;&#x793A;&#x5237;&#x65B0;&#x65F6;&#x95F4;&#x7684;key</td>
</tr>
</tbody>
</table>
<pre class="language-"><code class="lang-lua"><span class="token comment">-- &#x8FD4;&#x56DE;&#x662F;&#x5426;&#x53EF;&#x4EE5;&#x6D3B;&#x83B7;&#x5F97;&#x9884;&#x671F;&#x7684;token</span>

<span class="token keyword">local</span> rate <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>ARGV<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">local</span> capacity <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>ARGV<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">local</span> now <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>ARGV<span class="token punctuation">[</span><span class="token number">3</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
<span class="token keyword">local</span> requested <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>ARGV<span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">)</span>

<span class="token comment">-- fill_time&#xFF1A;&#x9700;&#x8981;&#x586B;&#x6EE1; token_bucket &#x9700;&#x8981;&#x591A;&#x4E45;</span>
<span class="token keyword">local</span> fill_time <span class="token operator">=</span> capacity<span class="token operator">/</span>rate
<span class="token comment">-- &#x5C06;&#x586B;&#x5145;&#x65F6;&#x95F4;&#x5411;&#x4E0B;&#x53D6;&#x6574;</span>
<span class="token keyword">local</span> ttl <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>fill_time<span class="token operator">*</span><span class="token number">2</span><span class="token punctuation">)</span>

<span class="token comment">-- &#x83B7;&#x53D6;&#x76EE;&#x524D; token_bucket &#x4E2D;&#x5269;&#x4F59; token &#x6570;</span>
<span class="token comment">-- &#x5982;&#x679C;&#x662F;&#x7B2C;&#x4E00;&#x6B21;&#x8FDB;&#x5165;&#xFF0C;&#x5219;&#x8BBE;&#x7F6E; token_bucket &#x6570;&#x91CF;&#x4E3A; &#x4EE4;&#x724C;&#x6876;&#x6700;&#x5927;&#x503C;</span>
<span class="token keyword">local</span> last_tokens <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>redis<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token string">&quot;get&quot;</span><span class="token punctuation">,</span> KEYS<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> last_tokens <span class="token operator">==</span> <span class="token keyword">nil</span> <span class="token keyword">then</span>
    last_tokens <span class="token operator">=</span> capacity
<span class="token keyword">end</span>

<span class="token comment">-- &#x4E0A;&#x4E00;&#x6B21;&#x66F4;&#x65B0; token_bucket &#x7684;&#x65F6;&#x95F4;</span>
<span class="token keyword">local</span> last_refreshed <span class="token operator">=</span> <span class="token function">tonumber</span><span class="token punctuation">(</span>redis<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token string">&quot;get&quot;</span><span class="token punctuation">,</span> KEYS<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> last_refreshed <span class="token operator">==</span> <span class="token keyword">nil</span> <span class="token keyword">then</span>
    last_refreshed <span class="token operator">=</span> <span class="token number">0</span>
<span class="token keyword">end</span>

<span class="token keyword">local</span> delta <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">max</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> now<span class="token operator">-</span>last_refreshed<span class="token punctuation">)</span>
<span class="token comment">-- &#x901A;&#x8FC7;&#x5F53;&#x524D;&#x65F6;&#x95F4;&#x4E0E;&#x4E0A;&#x4E00;&#x6B21;&#x66F4;&#x65B0;&#x65F6;&#x95F4;&#x7684;&#x8DE8;&#x5EA6;&#xFF0C;&#x4EE5;&#x53CA;&#x751F;&#x4EA7;token&#x7684;&#x901F;&#x7387;&#xFF0C;&#x8BA1;&#x7B97;&#x51FA;&#x65B0;&#x7684;token&#x6570;</span>
<span class="token comment">-- &#x5982;&#x679C;&#x8D85;&#x8FC7; max_burst&#xFF0C;&#x591A;&#x4F59;&#x751F;&#x4EA7;&#x7684;token&#x4F1A;&#x88AB;&#x4E22;&#x5F03;</span>
<span class="token keyword">local</span> filled_tokens <span class="token operator">=</span> math<span class="token punctuation">.</span><span class="token function">min</span><span class="token punctuation">(</span>capacity<span class="token punctuation">,</span> last_tokens<span class="token operator">+</span><span class="token punctuation">(</span>delta<span class="token operator">*</span>rate<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">local</span> allowed <span class="token operator">=</span> filled_tokens <span class="token operator">&gt;=</span> requested
<span class="token keyword">local</span> new_tokens <span class="token operator">=</span> filled_tokens
<span class="token keyword">if</span> allowed <span class="token keyword">then</span>
    new_tokens <span class="token operator">=</span> filled_tokens <span class="token operator">-</span> requested
<span class="token keyword">end</span>

<span class="token comment">-- &#x66F4;&#x65B0;&#x65B0;&#x7684;token&#x6570;&#xFF0C;&#x4EE5;&#x53CA;&#x66F4;&#x65B0;&#x65F6;&#x95F4;</span>
redis<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token string">&quot;setex&quot;</span><span class="token punctuation">,</span> KEYS<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">,</span> ttl<span class="token punctuation">,</span> new_tokens<span class="token punctuation">)</span>
redis<span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token string">&quot;setex&quot;</span><span class="token punctuation">,</span> KEYS<span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">,</span> ttl<span class="token punctuation">,</span> now<span class="token punctuation">)</span>

<span class="token keyword">return</span> allowed
</code></pre>
<p>&#x4E0A;&#x8FF0;&#x53EF;&#x4EE5;&#x770B;&#x51FA; <code>lua script</code> &#xFF1A;&#x53EA;&#x6D89;&#x53CA;&#x5BF9; token &#x64CD;&#x4F5C;&#xFF0C;&#x4FDD;&#x8BC1; token &#x751F;&#x4EA7;&#x5408;&#x7406;&#x548C;&#x8BFB;&#x53D6;&#x5408;&#x7406;&#x3002;</p>
<h2 id="&#x51FD;&#x6570;&#x5206;&#x6790;">&#x51FD;&#x6570;&#x5206;&#x6790;</h2>
<p><img src="https://cdn.nlark.com/yuque/0/2020/png/261626/1606107337223-7756ecdf-acb6-48c2-9ff5-959de01a1a03.png#align=left&amp;display=inline&amp;height=896&amp;margin=%5Bobject%20Object%5D&amp;originHeight=896&amp;originWidth=2038&amp;status=done&amp;style=none&amp;width=2038" alt=""></p>
<p>&#x4ECE;&#x4E0A;&#x8FF0;&#x6D41;&#x7A0B;&#x4E2D;&#x770B;&#x51FA;&#xFF1A;</p>
<ol>
<li>&#x6709;&#x591A;&#x91CD;&#x4FDD;&#x969C;&#x673A;&#x5236;&#xFF0C;&#x4FDD;&#x8BC1;&#x9650;&#x6D41;&#x4E00;&#x5B9A;&#x4F1A;&#x5B8C;&#x6210;&#x3002;</li>
<li>&#x5982;&#x679C;<code>redis limiter</code>&#x5931;&#x6548;&#xFF0C;&#x81F3;&#x5C11;&#x5728;&#x8FDB;&#x7A0B;&#x5185;<code>rate limiter</code>&#x515C;&#x5E95;&#x3002;</li>
<li>&#x91CD;&#x8BD5; <code>redis limiter</code> &#x673A;&#x5236;&#x4FDD;&#x8BC1;&#x5C3D;&#x53EF;&#x80FD;&#x5730;&#x6B63;&#x5E38;&#x8FD0;&#x884C;&#x3002;</li>
</ol>
<h2 id="&#x603B;&#x7ED3;">&#x603B;&#x7ED3;</h2>
<p><code>go-zero</code> &#x4E2D;&#x7684; <code>tokenlimit</code> &#x9650;&#x6D41;&#x65B9;&#x6848;&#x9002;&#x7528;&#x4E8E;&#x77AC;&#x65F6;&#x6D41;&#x91CF;&#x51B2;&#x51FB;&#xFF0C;&#x73B0;&#x5B9E;&#x8BF7;&#x6C42;&#x573A;&#x666F;&#x5E76;&#x4E0D;&#x4EE5;&#x6052;&#x5B9A;&#x7684;&#x901F;&#x7387;&#x3002;&#x4EE4;&#x724C;&#x6876;&#x76F8;&#x5F53;&#x9884;&#x8BF7;&#x6C42;&#xFF0C;&#x5F53;&#x771F;&#x5B9E;&#x7684;&#x8BF7;&#x6C42;&#x5230;&#x8FBE;&#x4E0D;&#x81F3;&#x4E8E;&#x77AC;&#x95F4;&#x88AB;&#x6253;&#x57AE;&#x3002;&#x5F53;&#x6D41;&#x91CF;&#x51B2;&#x51FB;&#x5230;&#x4E00;&#x5B9A;&#x7A0B;&#x5EA6;&#xFF0C;&#x5219;&#x624D;&#x4F1A;&#x6309;&#x7167;&#x9884;&#x5B9A;&#x901F;&#x7387;&#x8FDB;&#x884C;&#x6D88;&#x8D39;&#x3002;</p>
<p>&#x4F46;&#x662F;&#x751F;&#x4EA7;<code>token</code>&#x4E0A;&#xFF0C;&#x4E0D;&#x80FD;&#x6309;&#x7167;&#x5F53;&#x65F6;&#x7684;&#x6D41;&#x91CF;&#x60C5;&#x51B5;&#x4F5C;&#x51FA;&#x52A8;&#x6001;&#x8C03;&#x6574;&#xFF0C;&#x4E0D;&#x591F;&#x7075;&#x6D3B;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x8FDB;&#x884C;&#x8FDB;&#x4E00;&#x6B65;&#x4F18;&#x5316;&#x3002;&#x6B64;&#x5916;&#x53EF;&#x4EE5;&#x53C2;&#x8003;<a href="https://en.wikipedia.org/wiki/Token_bucket" target="_blank">Token bucket WIKI</a> &#x4E2D;&#x63D0;&#x5230;&#x5206;&#x5C42;&#x4EE4;&#x724C;&#x6876;&#xFF0C;&#x6839;&#x636E;&#x4E0D;&#x540C;&#x7684;&#x6D41;&#x91CF;&#x5E26;&#x5BBD;&#xFF0C;&#x5206;&#x81F3;&#x4E0D;&#x540C;&#x6392;&#x961F;&#x4E2D;&#x3002;</p>
<h2 id="&#x53C2;&#x8003;">&#x53C2;&#x8003;</h2>
<ul>
<li><a href="https://github.com/tal-tech/go-zero/blob/master/core/limit/tokenlimit.go" target="_blank">go-zero tokenlimit</a></li>
<li><a href="https://github.com/go-redis/redis_rate" target="_blank">Go-Redis &#x63D0;&#x4F9B;&#x7684;&#x5206;&#x5E03;&#x5F0F;&#x9650;&#x6D41;&#x5E93;</a></li>
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