limour
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limour-blog.github.io
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          <article class="post-content mx-auto">
            <h1 id="seo-header">【记录】Go 实现 OpenAI API HTTP 代理</h1>
            
              <p id="updated-time" class="note note-info" style="">
                
                  
                    Last updated on March 19, 2024 pm
                  
                
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              <div class="markdown-body">
                
                <p>代码参考自 <a href="https://hexo.limour.top/go/#aHR0cHM6Ly9naXRodWIuY29tL2dlZWtyLWRldi9vcGVuYWktcHJveHk=" rel="noopener external nofollow noreferrer">GO-OPENAI-PROXY</a>，由 GPT-3.5 辅助修改。</p>
<h2 id="优点">优点</h2>
<ul>
<li>支持多key轮询，且key对前端透明</li>
<li>可以对messages进行自定义修改</li>
<li>不受网络环境影响</li>
</ul>
<h2 id="编译反代程序">编译反代程序</h2>
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class="code"><pre><code class="hljs go"><span class="hljs-keyword">package</span> main<br><br><span class="hljs-keyword">import</span> (<br>    <span class="hljs-string">&quot;io&quot;</span><br>    <span class="hljs-string">&quot;io/ioutil&quot;</span><br>    <span class="hljs-string">&quot;log&quot;</span><br>    <span class="hljs-string">&quot;net/http&quot;</span><br>    <span class="hljs-string">&quot;net/url&quot;</span><br>    <span class="hljs-string">&quot;strings&quot;</span><br>    <span class="hljs-string">&quot;bytes&quot;</span><br>    <span class="hljs-string">&quot;encoding/json&quot;</span><br>    <span class="hljs-string">&quot;time&quot;</span><br>    <span class="hljs-string">&quot;sync&quot;</span><br>)<br><br><span class="hljs-keyword">var</span> (<br>    target    = <span class="hljs-string">&quot;https://api.openai.com&quot;</span> <span class="hljs-comment">// 目标域名</span><br>    mu sync.Mutex<br>    count <span class="hljs-type">int</span><br>)<br><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">main</span><span class="hljs-params">()</span></span> &#123;<br>    http.HandleFunc(<span class="hljs-string">&quot;/&quot;</span>, handleRequest)<br>    http.ListenAndServe(<span class="hljs-string">&quot;:9000&quot;</span>, <span class="hljs-literal">nil</span>)<br>&#125;<br><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">get1Key</span><span class="hljs-params">(key <span class="hljs-type">string</span>)</span></span> <span class="hljs-type">string</span> &#123;<br>    mu.Lock()<br>    <span class="hljs-keyword">defer</span> mu.Unlock()<br><br>    arr := strings.Split(key, <span class="hljs-string">&quot;|&quot;</span>)<br>    randomIndex := count % <span class="hljs-built_in">len</span>(arr)<br>    count++<br>    <span class="hljs-keyword">if</span> count &gt; <span class="hljs-number">999999</span> &#123;<br>        count = <span class="hljs-number">0</span><br>    &#125;<br>    randomSubstr := arr[randomIndex]<br>    log.Println(<span class="hljs-string">&quot;Authorization&quot;</span>, randomSubstr)<br>    <span class="hljs-keyword">return</span> randomSubstr<br>&#125;<br><br><span class="hljs-comment">// Get a json decoder for a given requests body</span><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">requestBodyDecoder</span><span class="hljs-params">(request *http.Request)</span></span> *json.Decoder &#123;<br>    <span class="hljs-comment">// Read body to buffer</span><br>    body, err := ioutil.ReadAll(request.Body)<br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        log.Printf(<span class="hljs-string">&quot;Error reading body: %v&quot;</span>, err)<br>        <span class="hljs-built_in">panic</span>(err)<br>    &#125;<br><br>    <span class="hljs-comment">// Because go lang is a pain in the ass if you read the body then any susequent calls</span><br>    <span class="hljs-comment">// are unable to read the body again....</span><br>    <span class="hljs-comment">// request.Body = ioutil.NopCloser(bytes.NewBuffer(body))</span><br><br>    <span class="hljs-keyword">return</span> json.NewDecoder(ioutil.NopCloser(bytes.NewBuffer(body)))<br>&#125;<br><br><span class="hljs-comment">// 在需要设置响应头的地方调用setResponseHeader函数即可</span><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">setResponseHeader</span><span class="hljs-params">(w http.ResponseWriter)</span></span> &#123;<br>    w.Header().Set(<span class="hljs-string">&quot;Access-Control-Allow-Methods&quot;</span>, <span class="hljs-string">&quot;GET,HEAD,POST,OPTIONS&quot;</span>)<br>    w.Header().Set(<span class="hljs-string">&quot;Access-Control-Allow-Origin&quot;</span>, <span class="hljs-string">&quot;*&quot;</span>)<br>    w.Header().Set(<span class="hljs-string">&quot;Access-Control-Max-Age&quot;</span>, <span class="hljs-string">&quot;86400&quot;</span>)<br>    w.Header().Set(<span class="hljs-string">&quot;Access-Control-Allow-Headers&quot;</span>, <span class="hljs-string">&quot;authorization,content-type&quot;</span>)<br>&#125;<br><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">handleBody</span><span class="hljs-params">(r *http.Request)</span></span> io.ReadCloser &#123;<br>    <span class="hljs-comment">// 读取请求体</span><br>    decoder := requestBodyDecoder(r)<br>    <span class="hljs-comment">// 解析JSON数据</span><br>    <span class="hljs-keyword">var</span> requestData <span class="hljs-keyword">map</span>[<span class="hljs-type">string</span>]<span class="hljs-keyword">interface</span>&#123;&#125;<br>    err := decoder.Decode(&amp;requestData)<br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        <span class="hljs-comment">// 处理解析JSON数据异常</span><br>        log.Printf(<span class="hljs-string">&quot;Error decoding body: %v&quot;</span>, err)<br>        <span class="hljs-built_in">panic</span>(err)<br>    &#125;<br>    <span class="hljs-comment">// 获取&quot;messages&quot;列表</span><br>    messages, ok := requestData[<span class="hljs-string">&quot;messages&quot;</span>].([]<span class="hljs-keyword">interface</span>&#123;&#125;)<br>    <span class="hljs-keyword">if</span> !ok &#123;<br>        <span class="hljs-comment">// &quot;messages&quot;字段不存在或类型不正确</span><br>        log.Printf(<span class="hljs-string">&quot;Error reading messages: %v&quot;</span>, ok)<br>        <span class="hljs-built_in">panic</span>(ok)<br>    &#125;<br>    <span class="hljs-comment">// 按需修改&quot;messages&quot;列表</span><br>    <span class="hljs-comment">// log.Println(&quot;debug 5&quot;, len(messages), len(messages) &gt; 4)</span><br>    <span class="hljs-keyword">if</span> <span class="hljs-built_in">len</span>(messages) &gt; <span class="hljs-number">4</span> &#123;<br>        firstMessage, ok := messages[<span class="hljs-number">0</span>].(<span class="hljs-keyword">map</span>[<span class="hljs-type">string</span>]<span class="hljs-keyword">interface</span>&#123;&#125;)<br>        <span class="hljs-keyword">if</span> !ok &#123;<br>            <span class="hljs-comment">// 第一个消息类型不正确</span><br>            log.Printf(<span class="hljs-string">&quot;Error reading firstMessage: %v&quot;</span>, ok)<br>            <span class="hljs-built_in">panic</span>(ok)<br>        &#125;<br><br>        role, roleOk := firstMessage[<span class="hljs-string">&quot;role&quot;</span>].(<span class="hljs-type">string</span>)<br>        <span class="hljs-comment">// log.Println(&quot;debug 6&quot;, roleOk, role, role == &quot;system&quot;, strings.EqualFold(role, &quot;system&quot;))</span><br>        <span class="hljs-keyword">if</span> roleOk &amp;&amp; strings.EqualFold(role, <span class="hljs-string">&quot;system&quot;</span>) &#123;<br>            <span class="hljs-comment">// 将第一个消息移动到倒数第三个位置</span><br>            thirdToLastIndex := <span class="hljs-built_in">len</span>(messages) - <span class="hljs-number">3</span><br>            messages_copy := <span class="hljs-built_in">make</span>([]<span class="hljs-keyword">interface</span>&#123;&#125;, <span class="hljs-number">0</span>)<br>            messages_copy = <span class="hljs-built_in">append</span>(messages_copy, messages[<span class="hljs-number">0</span>])<br>            messages_copy = <span class="hljs-built_in">append</span>(messages_copy, messages[thirdToLastIndex:]...)<br>            messages = <span class="hljs-built_in">append</span>(messages[<span class="hljs-number">1</span>:thirdToLastIndex], messages_copy...)<br>            <br>            <span class="hljs-comment">// 更新&quot;messages&quot;列表</span><br>            requestData[<span class="hljs-string">&quot;messages&quot;</span>] = messages<br>            log.Println(<span class="hljs-string">&quot;move system role to &quot;</span>, thirdToLastIndex)<br>        &#125;<br>    &#125;<br>    <span class="hljs-comment">// 将更新后的数据编码为JSON</span><br>    <span class="hljs-keyword">var</span> buf bytes.Buffer<br>    encoder := json.NewEncoder(&amp;buf)<br>    err = encoder.Encode(requestData)<br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        <span class="hljs-comment">// 处理编码JSON数据异常</span><br>        log.Printf(<span class="hljs-string">&quot;Error encoding body: %v&quot;</span>, err)<br>        <span class="hljs-built_in">panic</span>(err)<br>    &#125;<br><br>    <span class="hljs-keyword">return</span> ioutil.NopCloser(&amp;buf)<br>&#125;<br><br><span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-title">handleRequest</span><span class="hljs-params">(w http.ResponseWriter, r *http.Request)</span></span> &#123;<br>    <span class="hljs-comment">// 过滤无效URL</span><br>    _, err := url.Parse(r.URL.String())<br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        log.Println(<span class="hljs-string">&quot;Error parsing URL: &quot;</span>, err.Error())<br>        http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)<br>        <span class="hljs-keyword">return</span><br>    &#125;<br><br>    <span class="hljs-comment">// 去掉环境前缀（针对腾讯云，如果包含的话，目前我只用到了test和release）</span><br>    newPath := strings.Replace(r.URL.Path, <span class="hljs-string">&quot;/release&quot;</span>, <span class="hljs-string">&quot;&quot;</span>, <span class="hljs-number">1</span>)<br>    newPath = strings.Replace(newPath, <span class="hljs-string">&quot;/test&quot;</span>, <span class="hljs-string">&quot;&quot;</span>, <span class="hljs-number">1</span>)<br><br>    <span class="hljs-comment">// 拼接目标URL</span><br>    targetURL := target + newPath<br><br>    <span class="hljs-comment">// 创建代理HTTP请求</span><br>    <span class="hljs-keyword">var</span> proxyReq *http.Request<br>    <span class="hljs-comment">// log.Println(&quot;debug 1&quot;, targetURL, r.Method)</span><br>    <span class="hljs-comment">// log.Println(&quot;debug 2&quot;, strings.Contains(targetURL, &quot;chat/completions&quot;))</span><br>    <span class="hljs-comment">// log.Println(&quot;debug 3&quot;, strings.EqualFold(r.Method, &quot;POST&quot;))</span><br>    <span class="hljs-keyword">if</span> strings.Contains(targetURL, <span class="hljs-string">&quot;chat/completions&quot;</span>) &amp;&amp; strings.EqualFold(r.Method, <span class="hljs-string">&quot;POST&quot;</span>)  &#123;<br>        <span class="hljs-comment">// log.Println(&quot;debug 4-0&quot;)</span><br>        proxyReq, err = http.NewRequest(r.Method, targetURL, handleBody(r))<br>    &#125; <span class="hljs-keyword">else</span> &#123;<br>        <span class="hljs-comment">// log.Println(&quot;debug 4-1&quot;)</span><br>        proxyReq, err = http.NewRequest(r.Method, targetURL, r.Body)<br>    &#125;<br><br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        log.Println(<span class="hljs-string">&quot;Error creating proxy request: &quot;</span>, err.Error())<br>        http.Error(w, <span class="hljs-string">&quot;Error creating proxy request&quot;</span>, http.StatusInternalServerError)<br>        <span class="hljs-keyword">return</span><br>    &#125;<br><br>    <span class="hljs-comment">// 将原始请求头复制到新请求中</span><br>    keys := strings.Split(r.Header.Get(<span class="hljs-string">&quot;Authorization&quot;</span>), <span class="hljs-string">&quot; &quot;</span>)<br>    <span class="hljs-keyword">if</span> <span class="hljs-built_in">len</span>(keys) == <span class="hljs-number">2</span> &#123;<br>           r.Header.Set(<span class="hljs-string">&quot;Authorization&quot;</span>, <span class="hljs-string">&quot;Bearer &quot;</span> + get1Key(keys[<span class="hljs-number">1</span>]))<br>    &#125;<br>    <span class="hljs-keyword">if</span> _, ok := r.Header[<span class="hljs-string">&quot;User-Agent&quot;</span>]; !ok &#123;<br>        <span class="hljs-comment">// explicitly disable User-Agent so it&#x27;s not set to default value</span><br>        r.Header.Set(<span class="hljs-string">&quot;User-Agent&quot;</span>, <span class="hljs-string">&quot;Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36&quot;</span>)<br>    &#125;<br>    proxyReq.Header = http.Header&#123;<br>        <span class="hljs-string">&quot;Content-Type&quot;</span>:  []<span class="hljs-type">string</span>&#123;<span class="hljs-string">&quot;application/json&quot;</span>&#125;,<br>        <span class="hljs-string">&quot;Authorization&quot;</span>: []<span class="hljs-type">string</span>&#123;r.Header.Get(<span class="hljs-string">&quot;Authorization&quot;</span>)&#125;,<br>        <span class="hljs-string">&quot;User-Agent&quot;</span>:    []<span class="hljs-type">string</span>&#123;r.Header.Get(<span class="hljs-string">&quot;User-Agent&quot;</span>)&#125;,<br>    &#125;<br><br>    <br>    <span class="hljs-comment">// 默认超时时间设置为60s</span><br>    client := &amp;http.Client&#123;<br>        Timeout: <span class="hljs-number">60</span> * time.Second,<br>    &#125;<br><br>    <span class="hljs-comment">// 向 OpenAI 发起代理请求</span><br>    resp, err := client.Do(proxyReq)<br>    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>        log.Println(<span class="hljs-string">&quot;Error sending proxy request: &quot;</span>, err.Error())<br>        http.Error(w, err.Error(), http.StatusInternalServerError)<br>        <span class="hljs-keyword">return</span><br>    &#125;<br>    <span class="hljs-keyword">defer</span> resp.Body.Close()<br><br>    <span class="hljs-comment">// 设置响应头</span><br>    setResponseHeader(w)<br>    <br>    <span class="hljs-comment">// 将响应状态码设置为原始响应状态码</span><br>    w.WriteHeader(resp.StatusCode)<br><br>    <span class="hljs-comment">// 将响应实体写入到响应流中（支持流式响应）</span><br>    buf := <span class="hljs-built_in">make</span>([]<span class="hljs-type">byte</span>, <span class="hljs-number">1024</span>)<br>    <span class="hljs-keyword">for</span> &#123;<br>        <span class="hljs-keyword">if</span> n, err := resp.Body.Read(buf); err == io.EOF || n == <span class="hljs-number">0</span> &#123;<br>            <span class="hljs-keyword">return</span><br>        &#125; <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> &#123;<br>            log.Println(<span class="hljs-string">&quot;error while reading respbody: &quot;</span>, err.Error())<br>            http.Error(w, err.Error(), http.StatusInternalServerError)<br>            <span class="hljs-keyword">return</span><br>        &#125; <span class="hljs-keyword">else</span> &#123;<br>            <span class="hljs-keyword">if</span> _, err = w.Write(buf[:n]); err != <span class="hljs-literal">nil</span> &#123;<br>                log.Println(<span class="hljs-string">&quot;error while writing resp: &quot;</span>, err.Error())<br>                http.Error(w, err.Error(), http.StatusInternalServerError)<br>                <span class="hljs-keyword">return</span><br>            &#125;<br>            w.(http.Flusher).Flush()<br>        &#125;<br>    &#125;<br>&#125;<br></code></pre></td></tr></table></figure>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs bash">CC=musl-gcc /home/jovyan/go/bin/go1.20.1 build -tags musl -o openai -trimpath -ldflags <span class="hljs-string">&#x27;-linkmode &quot;external&quot; -extldflags &quot;-static&quot; -s -w -buildid=&#x27;</span> ./openai-proxy.go<br></code></pre></td></tr></table></figure>
<h2 id="docker部署">docker部署</h2>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs bash"><span class="hljs-built_in">mkdir</span> -p ~/app/apio &amp;&amp; <span class="hljs-built_in">cd</span> ~/app/apio &amp;&amp; nano docker-compose.yml<br><span class="hljs-built_in">chmod</span> 777 openai<br>sudo docker-compose up -d &amp;&amp; sudo docker-compose logs<br></code></pre></td></tr></table></figure>
<figure class="highlight yml"><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></pre></td><td class="code"><pre><code class="hljs yml"><span class="hljs-attr">version:</span> <span class="hljs-string">&#x27;3.3&#x27;</span><br><span class="hljs-attr">services:</span><br>    <span class="hljs-attr">apio:</span><br>        <span class="hljs-attr">restart:</span> <span class="hljs-string">always</span><br>        <span class="hljs-attr">image:</span> <span class="hljs-string">alpine:latest</span><br>        <span class="hljs-attr">volumes:</span><br>          <span class="hljs-bullet">-</span> <span class="hljs-string">./openai:/bin/openai</span><br>        <span class="hljs-attr">entrypoint:</span> [<span class="hljs-string">&quot;/bin/openai&quot;</span>]<br> <br><span class="hljs-attr">networks:</span><br>  <span class="hljs-attr">default:</span><br>    <span class="hljs-attr">external:</span> <span class="hljs-literal">true</span><br>    <span class="hljs-attr">name:</span> <span class="hljs-string">ngpm</span><br></code></pre></td></tr></table></figure>
<h2 id="Nginx-Proxy-Manager反代">Nginx Proxy Manager反代</h2>
<p><img src="https://img.limour.top/2023/08/30/64ef2d16a4577.webp" srcset="https://jscdn.limour.top/gh/Limour-dev/Sakurairo_Vision/load_svg/inload.svg" lazyload alt=""></p>
<ul>
<li><a href="/Docker-bu-shu-Nginx-Proxy-Manager">Nginx Proxy Manager</a></li>
</ul>
<h2 id="前端测试">前端测试</h2>
<ul>
<li><a href="https://hexo.limour.top/go/#aHR0cHM6Ly9naXRodWIuY29tL3p0amh6L0JldHRlckNoYXRHUFQ=" rel="noopener external nofollow noreferrer">BetterChatGPT</a></li>
<li>API端点 填入<code>https://yourdomain/token/v1/chat/completions</code></li>
<li>API密钥 随便填</li>
</ul>

                
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      <div>【记录】Go 实现 OpenAI API HTTP 代理</div>
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