{"id":114187,"date":"2026-10-08T15:24:53","date_gmt":"2026-10-08T07:24:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/114187.html"},"modified":"2026-10-08T15:24:53","modified_gmt":"2026-10-08T07:24:53","slug":"go%e8%af%ad%e8%a8%80sse%e6%9c%8d%e5%8a%a1%e7%ab%af%e6%8e%a8%e9%80%81%e4%ba%8b%e4%bb%b6%e4%b8%8e%e5%89%8d%e7%ab%afeventsource%e5%ae%9e%e6%97%b6%e9%80%9a%e7%9f%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/114187.html","title":{"rendered":"Go\u8bed\u8a00SSE\u670d\u52a1\u7aef\u63a8\u9001\u4e8b\u4ef6\u4e0e\u524d\u7aefEventSource\u5b9e\u65f6\u901a\u77e5"},"content":{"rendered":"<h2>Go\u8bed\u8a00SSE\u670d\u52a1\u7aef\u63a8\u9001\u4e8b\u4ef6\u4e0e\u524d\u7aefEventSource\u5b9e\u65f6\u901a\u77e5<\/h2>\n<h3>\u5bfc\u8bed<\/h3>\n<p>\u5728\u5b9e\u65f6Web\u5e94\u7528\u4e2d&#xff0c;\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u6570\u636e\u662f\u4e00\u9879\u57fa\u672c\u9700\u6c42\u3002\u4f20\u7edf\u7684\u5b9e\u73b0\u65b9\u6848\u5305\u62ec&#xff1a;\u77ed\u8f6e\u8be2&#xff08;Short Polling&#xff09;\u3001\u957f\u8f6e\u8be2&#xff08;Long Polling&#xff09;\u3001WebSocket\u548cSSE&#xff08;Server-Sent Events&#xff09;\u3002\u5176\u4e2d&#xff0c;SSE\u662f\u4e00\u79cd\u57fa\u4e8eHTTP\u7684\u8f7b\u91cf\u7ea7\u63a8\u9001\u6280\u672f&#xff0c;\u5177\u6709\u5b9e\u73b0\u7b80\u5355\u3001\u81ea\u52a8\u91cd\u8fde\u3001\u652f\u6301\u81ea\u5b9a\u4e49\u4e8b\u4ef6\u7c7b\u578b\u7b49\u4f18\u70b9\u3002\u4e0eWebSocket\u76f8\u6bd4&#xff0c;SSE\u662f\u5355\u5411\u901a\u4fe1&#xff08;\u670d\u52a1\u7aef\u2192\u5ba2\u6237\u7aef&#xff09;&#xff0c;\u975e\u5e38\u9002\u5408\u80a1\u7968\u884c\u60c5\u3001\u65b0\u95fb\u63a8\u9001\u3001\u65e5\u5fd7\u6d41\u5f0f\u8f93\u51fa\u7b49\u573a\u666f\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8Go\u8bed\u8a00\u4e2d\u5b9e\u73b0SSE\u7684\u5b8c\u6574\u65b9\u6848&#xff0c;\u5e76\u7ed3\u5408\u524d\u7aefEventSource API\u5b9e\u73b0\u5b9e\u65f6\u901a\u77e5\u529f\u80fd\u3002<\/p>\n<h3>\u6838\u5fc3\u6280\u672f\u77e5\u8bc6\u70b9\u8bb2\u89e3<\/h3>\n<h4>1. SSE\u534f\u8bae\u57fa\u7840<\/h4>\n<p>SSE\u662fHTML5\u89c4\u8303\u7684\u4e00\u90e8\u5206&#xff0c;\u5141\u8bb8\u670d\u52a1\u7aef\u5411\u5ba2\u6237\u7aef\u6d41\u5f0f\u63a8\u9001\u6587\u672c\u6570\u636e\u3002<\/p>\n<p>HTTP\u54cd\u5e94\u5934\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>Content-Type: text\/event-stream<\/li>\n<li>Cache-Control: no-cache<\/li>\n<li>Connection: keep-alive<\/li>\n<\/ul>\n<p>\u6d88\u606f\u683c\u5f0f&#xff1a;<\/p>\n<p>event: \u4e8b\u4ef6\u7c7b\u578b&#xff08;\u53ef\u9009&#xff09;<br \/>\ndata: \u6d88\u606f\u5185\u5bb9<br \/>\nid: \u4e8b\u4ef6ID&#xff08;\u53ef\u9009&#xff09;<br \/>\nretry: \u91cd\u8fde\u5ef6\u65f6&#xff08;\u53ef\u9009&#xff0c;\u5355\u4f4d\u6beb\u79d2&#xff09;<\/p>\n<p>&#xff08;\u7a7a\u884c\u8868\u793a\u6d88\u606f\u7ed3\u675f&#xff09;<\/p>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p>event: update<br \/>\ndata: {&#034;time&#034;: &#034;2026-06-08 12:00:00&#034;, &#034;value&#034;: 42}<\/p>\n<p>event: ping<br \/>\ndata: heartbeat<\/p>\n<h4>2. \u524d\u7aefEventSource API<\/h4>\n<p>\u6d4f\u89c8\u5668\u539f\u751f\u652f\u6301SSE&#xff0c;\u901a\u8fc7EventSource\u63a5\u53e3\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">const<\/span> eventSource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EventSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\/events&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76d1\u542c\u9ed8\u8ba4\u6d88\u606f&#xff08;\u6ca1\u6709event\u5b57\u6bb5\u7684\u6d88\u606f&#xff09;<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onmessage<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6536\u5230\u6d88\u606f:&#039;<\/span><span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u76d1\u542c\u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">addEventListener<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;update&#039;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">event<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u6536\u5230update\u4e8b\u4ef6:&#039;<\/span><span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u5904\u7406\u548c\u81ea\u52a8\u91cd\u8fde<\/span><br \/>\neventSource<span class=\"token punctuation\">.<\/span><span class=\"token function-variable function\">onerror<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">function<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#039;\u8fde\u63a5\u9519\u8bef&#xff0c;\u5c06\u81ea\u52a8\u91cd\u8fde&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u81ea\u52a8\u91cd\u8fde\u673a\u5236&#xff08;\u9ed8\u8ba43\u79d2&#xff09;<\/li>\n<li>\u652f\u6301CORS<\/li>\n<li>\u8f7b\u91cf\u7ea7&#xff0c;\u65e0\u9700\u989d\u5916JS\u5e93<\/li>\n<\/ul>\n<h4>3. Go\u8bed\u8a00\u5b9e\u73b0SSE\u7684\u5173\u952e\u70b9<\/h4>\n<ul>\n<li>\u8bbe\u7f6e\u6b63\u786e\u7684\u54cd\u5e94\u5934<\/li>\n<li>\u7981\u7528\u8f93\u51fa\u7f13\u51b2&#xff08;\u4f7f\u7528Flusher\u63a5\u53e3&#xff09;<\/li>\n<li>\u4fdd\u6301\u8fde\u63a5\u4e0d\u5173\u95ed<\/li>\n<li>\u4f7f\u7528channel\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u6d88\u606f<\/li>\n<li>\u68c0\u6d4b\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5<\/li>\n<\/ul>\n<h4>4. SSE vs WebSocket vs \u957f\u8f6e\u8be2<\/h4>\n<table>\n<tr>\u7279\u6027SSEWebSocket\u957f\u8f6e\u8be2<\/tr>\n<tbody>\n<tr>\n<td>\u901a\u4fe1\u65b9\u5411<\/td>\n<td>\u5355\u5411&#xff08;\u670d\u52a1\u7aef\u2192\u5ba2\u6237\u7aef&#xff09;<\/td>\n<td>\u53cc\u5411<\/td>\n<td>\u5355\u5411<\/td>\n<\/tr>\n<tr>\n<td>\u534f\u8bae<\/td>\n<td>HTTP<\/td>\n<td>\u72ec\u7acb\u534f\u8bae&#xff08;ws:\/\/&#xff09;<\/td>\n<td>HTTP<\/td>\n<\/tr>\n<tr>\n<td>\u6d4f\u89c8\u5668\u652f\u6301<\/td>\n<td>\u597d&#xff08;\u9664IE&#xff09;<\/td>\n<td>\u597d<\/td>\n<td>\u597d<\/td>\n<\/tr>\n<tr>\n<td>\u81ea\u52a8\u91cd\u8fde<\/td>\n<td>\u662f<\/td>\n<td>\u9700\u624b\u52a8\u5b9e\u73b0<\/td>\n<td>\u9700\u624b\u52a8\u5b9e\u73b0<\/td>\n<\/tr>\n<tr>\n<td>\u590d\u6742\u5ea6<\/td>\n<td>\u4f4e<\/td>\n<td>\u4e2d<\/td>\n<td>\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u5b9e\u6218\u4ee3\u7801\u6f14\u793a\/\u9879\u76ee\u6848\u4f8b\u603b\u7ed3<\/h3>\n<h4>\u5b8c\u6574\u7684SSE\u670d\u52a1\u7aef\u5b9e\u73b0&#xff08;Go&#xff09;<\/h4>\n<p><span class=\"token keyword\">package<\/span> main<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;encoding\/json&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;fmt&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;log&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;net\/http&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;os&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;os\/signal&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;strings&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;sync&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;syscall&#034;<\/span><br \/>\n    <span class=\"token string\">&#034;time&#034;<\/span><br \/>\n<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6d88\u606f\u7ed3\u6784<\/span><br \/>\n<span class=\"token keyword\">type<\/span> SSEMessage <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    Event <span class=\"token builtin\">string<\/span>      <span class=\"token string\">&#096;json:&#034;event,omitempty&#034;&#096;<\/span><br \/>\n    Data  <span class=\"token keyword\">interface<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span> <span class=\"token string\">&#096;json:&#034;data&#034;&#096;<\/span><br \/>\n    ID    <span class=\"token builtin\">string<\/span>      <span class=\"token string\">&#096;json:&#034;id,omitempty&#034;&#096;<\/span><br \/>\n    Retry <span class=\"token builtin\">int<\/span>         <span class=\"token string\">&#096;json:&#034;retry,omitempty&#034;&#096;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ SSE\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\n<span class=\"token keyword\">type<\/span> SSEClient <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    ID     <span class=\"token builtin\">string<\/span><br \/>\n    Channel <span class=\"token keyword\">chan<\/span> SSEMessage<br \/>\n    Done    <span class=\"token keyword\">chan<\/span> <span class=\"token keyword\">struct<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ SSE\u4e8b\u4ef6\u603b\u7ebf<\/span><br \/>\n<span class=\"token keyword\">type<\/span> SSEBroker <span class=\"token keyword\">struct<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    clients    <span class=\"token keyword\">map<\/span><span class=\"token punctuation\">[<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">*<\/span>SSEClient<br \/>\n    subscribe   <span class=\"token keyword\">chan<\/span> <span class=\"token operator\">*<\/span>SSEClient<br \/>\n    unsubscribe <span class=\"token keyword\">chan<\/span> <span class=\"token operator\">*<\/span>SSEClient<br \/>\n    broadcast  <span class=\"token keyword\">chan<\/span> SSEMessage<br \/>\n    mutex      sync<span class=\"token punctuation\">.<\/span>RWMutex<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u521b\u5efa\u65b0\u7684SSE\u4ee3\u7406<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">NewSSEBroker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span>SSEBroker <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&amp;<\/span>SSEBroker<span class=\"token punctuation\">{<\/span><br \/>\n        clients<span class=\"token punctuation\">:<\/span>      <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">map<\/span><span class=\"token punctuation\">[<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">]<\/span><span class=\"token operator\">*<\/span>SSEClient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        subscribe<span class=\"token punctuation\">:<\/span>    <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">chan<\/span> <span class=\"token operator\">*<\/span>SSEClient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        unsubscribe<span class=\"token punctuation\">:<\/span>   <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">chan<\/span> <span class=\"token operator\">*<\/span>SSEClient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        broadcast<span class=\"token punctuation\">:<\/span>     <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">chan<\/span> SSEMessage<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u542f\u52a8\u4ee3\u7406\u4e3b\u5faa\u73af<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">select<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">case<\/span> client <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&lt;-<\/span>b<span class=\"token punctuation\">.<\/span>subscribe<span class=\"token punctuation\">:<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">Lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">[<\/span>client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> client<br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">Unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2713 \u5ba2\u6237\u7aef %s \u5df2\u8fde\u63a5 (\u5728\u7ebf: %d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">,<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token comment\">\/\/ \u53d1\u9001\u6b22\u8fce\u6d88\u606f<\/span><br \/>\n            welcome <span class=\"token operator\">:&#061;<\/span> SSEMessage<span class=\"token punctuation\">{<\/span><br \/>\n                Event<span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;welcome&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                Data<span class=\"token punctuation\">:<\/span>  fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6b22\u8fce %s \u8fde\u63a5SSE\u670d\u52a1&#034;<\/span><span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                ID<span class=\"token punctuation\">:<\/span>    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">UnixNano<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">select<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> client<span class=\"token punctuation\">.<\/span>Channel <span class=\"token operator\">&lt;-<\/span> welcome<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&lt;-<\/span>time<span class=\"token punctuation\">.<\/span><span class=\"token function\">After<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u53d1\u9001\u6b22\u8fce\u6d88\u606f\u8d85\u65f6: %s&#034;<\/span><span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">case<\/span> client <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&lt;-<\/span>b<span class=\"token punctuation\">.<\/span>unsubscribe<span class=\"token punctuation\">:<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">Lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> ok <span class=\"token operator\">:&#061;<\/span> b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">[<\/span>client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> ok <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token function\">delete<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">.<\/span>Channel<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">.<\/span>Done<span class=\"token punctuation\">)<\/span><br \/>\n                log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2717 \u5ba2\u6237\u7aef %s \u5df2\u65ad\u5f00 (\u5728\u7ebf: %d)\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">,<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">Unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">case<\/span> msg <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&lt;-<\/span>b<span class=\"token punctuation\">.<\/span>broadcast<span class=\"token punctuation\">:<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">RLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> client <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> b<span class=\"token punctuation\">.<\/span>clients <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">select<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> client<span class=\"token punctuation\">.<\/span>Channel <span class=\"token operator\">&lt;-<\/span> msg<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&lt;-<\/span>time<span class=\"token punctuation\">.<\/span><span class=\"token function\">After<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                    log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5411\u5ba2\u6237\u7aef %s \u53d1\u9001\u6d88\u606f\u8d85\u65f6&#034;<\/span><span class=\"token punctuation\">,<\/span> client<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">RUnlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8ba2\u9605SSE<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Subscribe<\/span><span class=\"token punctuation\">(<\/span>client <span class=\"token operator\">*<\/span>SSEClient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>subscribe <span class=\"token operator\">&lt;-<\/span> client<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d6\u6d88\u8ba2\u9605<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Unsubscribe<\/span><span class=\"token punctuation\">(<\/span>client <span class=\"token operator\">*<\/span>SSEClient<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>unsubscribe <span class=\"token operator\">&lt;-<\/span> client<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5e7f\u64ad\u6d88\u606f<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> <span class=\"token function\">Broadcast<\/span><span class=\"token punctuation\">(<\/span>msg SSEMessage<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>broadcast <span class=\"token operator\">&lt;-<\/span> msg<br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u83b7\u53d6\u5728\u7ebf\u5ba2\u6237\u7aef\u6570\u91cf<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> <span class=\"token function\">ClientCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token builtin\">int<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">RLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">defer<\/span> b<span class=\"token punctuation\">.<\/span>mutex<span class=\"token punctuation\">.<\/span><span class=\"token function\">RUnlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">len<\/span><span class=\"token punctuation\">(<\/span>b<span class=\"token punctuation\">.<\/span>clients<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ SSE\u5904\u7406\u5668&#xff08;\u6838\u5fc3\u5b9e\u73b0&#xff09;<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">sseHandler<\/span><span class=\"token punctuation\">(<\/span>broker <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> http<span class=\"token punctuation\">.<\/span>HandlerFunc <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span>w http<span class=\"token punctuation\">.<\/span>ResponseWriter<span class=\"token punctuation\">,<\/span> r <span class=\"token operator\">*<\/span>http<span class=\"token punctuation\">.<\/span>Request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bbe\u7f6eSSE\u54cd\u5e94\u5934<\/span><br \/>\n        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Content-Type&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/event-stream&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Cache-Control&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;no-cache&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Connection&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;keep-alive&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Access-Control-Allow-Origin&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;*&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ CORS\u652f\u6301<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u67e5\u662f\u5426\u652f\u6301Flusher&#xff08;\u5fc5\u987b\u652f\u6301&#xff0c;\u5426\u5219\u65e0\u6cd5\u6d41\u5f0f\u8f93\u51fa&#xff09;<\/span><br \/>\n        flusher<span class=\"token punctuation\">,<\/span> ok <span class=\"token operator\">:&#061;<\/span> w<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token punctuation\">.<\/span>Flusher<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token operator\">!<\/span>ok <span class=\"token punctuation\">{<\/span><br \/>\n            http<span class=\"token punctuation\">.<\/span><span class=\"token function\">Error<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Streaming unsupported&#034;<\/span><span class=\"token punctuation\">,<\/span> http<span class=\"token punctuation\">.<\/span>StatusInternalServerError<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u5ba2\u6237\u7aef<\/span><br \/>\n        clientID <span class=\"token operator\">:&#061;<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client_%d&#034;<\/span><span class=\"token punctuation\">,<\/span> time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">UnixNano<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        client <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&amp;<\/span>SSEClient<span class=\"token punctuation\">{<\/span><br \/>\n            ID<span class=\"token punctuation\">:<\/span>     clientID<span class=\"token punctuation\">,<\/span><br \/>\n            Channel<span class=\"token punctuation\">:<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">chan<\/span> SSEMessage<span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            Done<span class=\"token punctuation\">:<\/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 punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8ba2\u9605<\/span><br \/>\n        broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Subscribe<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">defer<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Unsubscribe<\/span><span class=\"token punctuation\">(<\/span>client<span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u76d1\u542c\u5ba2\u6237\u7aef\u65ad\u5f00<\/span><br \/>\n        notify <span class=\"token operator\">:&#061;<\/span> r<span class=\"token punctuation\">.<\/span><span class=\"token function\">Context<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Done<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53d1\u9001\u521d\u59cb\u6d88\u606f&#xff08;\u8fde\u63a5\u5efa\u7acb\u786e\u8ba4&#xff09;<\/span><br \/>\n        fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;: SSE\u8fde\u63a5\u5df2\u5efa\u7acb\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        flusher<span class=\"token punctuation\">.<\/span><span class=\"token function\">Flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6d88\u606f\u63a8\u9001\u5faa\u73af<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">select<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">case<\/span> msg <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&lt;-<\/span>client<span class=\"token punctuation\">.<\/span>Channel<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6784\u9020SSE\u6d88\u606f\u683c\u5f0f<\/span><br \/>\n                <span class=\"token keyword\">var<\/span> builder strings<span class=\"token punctuation\">.<\/span>Builder<\/p>\n<p>                <span class=\"token keyword\">if<\/span> msg<span class=\"token punctuation\">.<\/span>ID <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>builder<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;id: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">.<\/span>ID<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                <span class=\"token keyword\">if<\/span> msg<span class=\"token punctuation\">.<\/span>Event <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>builder<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;event: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">.<\/span>Event<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u5c06\u6570\u636e\u5e8f\u5217\u5316\u4e3aJSON<\/span><br \/>\n                dataJSON<span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> json<span class=\"token punctuation\">.<\/span><span class=\"token function\">Marshal<\/span><span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">.<\/span>Data<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e8f\u5217\u5316\u6d88\u606f\u5931\u8d25: %v&#034;<\/span><span class=\"token punctuation\">,<\/span> err<span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token keyword\">continue<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>builder<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;data: %s\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> dataJSON<span class=\"token punctuation\">)<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u5199\u5165\u54cd\u5e94<\/span><br \/>\n                fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprint<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> builder<span class=\"token punctuation\">.<\/span><span class=\"token function\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                flusher<span class=\"token punctuation\">.<\/span><span class=\"token function\">Flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>                log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u2192 \u63a8\u9001\u6d88\u606f\u5230 %s: %s&#034;<\/span><span class=\"token punctuation\">,<\/span> clientID<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">.<\/span>Event<span class=\"token punctuation\">)<\/span><\/p>\n<p>            <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&lt;-<\/span>notify<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5<\/span><br \/>\n                log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aef %s \u65ad\u5f00\u8fde\u63a5&#034;<\/span><span class=\"token punctuation\">,<\/span> clientID<span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><\/p>\n<p>            <span class=\"token keyword\">case<\/span> <span class=\"token operator\">&lt;-<\/span>client<span class=\"token punctuation\">.<\/span>Done<span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u670d\u52a1\u7aef\u4e3b\u52a8\u5173\u95ed<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u53d1\u9001\u6d88\u606f\u7684HTTP\u63a5\u53e3<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">sendMessageHandler<\/span><span class=\"token punctuation\">(<\/span>broker <span class=\"token operator\">*<\/span>SSEBroker<span class=\"token punctuation\">)<\/span> http<span class=\"token punctuation\">.<\/span>HandlerFunc <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span>w http<span class=\"token punctuation\">.<\/span>ResponseWriter<span class=\"token punctuation\">,<\/span> r <span class=\"token operator\">*<\/span>http<span class=\"token punctuation\">.<\/span>Request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> r<span class=\"token punctuation\">.<\/span>Method <span class=\"token operator\">!&#061;<\/span> http<span class=\"token punctuation\">.<\/span>MethodPost <span class=\"token punctuation\">{<\/span><br \/>\n            http<span class=\"token punctuation\">.<\/span><span class=\"token function\">Error<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Method not allowed&#034;<\/span><span class=\"token punctuation\">,<\/span> http<span class=\"token punctuation\">.<\/span>StatusMethodNotAllowed<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">var<\/span> msg SSEMessage<br \/>\n        <span class=\"token keyword\">if<\/span> err <span class=\"token operator\">:&#061;<\/span> json<span class=\"token punctuation\">.<\/span><span class=\"token function\">NewDecoder<\/span><span class=\"token punctuation\">(<\/span>r<span class=\"token punctuation\">.<\/span>Body<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Decode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>msg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            http<span class=\"token punctuation\">.<\/span><span class=\"token function\">Error<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Invalid request body&#034;<\/span><span class=\"token punctuation\">,<\/span> http<span class=\"token punctuation\">.<\/span>StatusBadRequest<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u6d88\u606fID<\/span><br \/>\n        msg<span class=\"token punctuation\">.<\/span>ID <span class=\"token operator\">&#061;<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">UnixNano<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e7f\u64ad\u6d88\u606f<\/span><br \/>\n        broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Broadcast<\/span><span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">)<\/span><\/p>\n<p>        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Content-Type&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;application\/json&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        json<span class=\"token punctuation\">.<\/span><span class=\"token function\">NewEncoder<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Encode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">map<\/span><span class=\"token punctuation\">[<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">]<\/span><span class=\"token keyword\">interface<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token string\">&#034;success&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token string\">&#034;clients&#034;<\/span><span class=\"token punctuation\">:<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">ClientCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token string\">&#034;message&#034;<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;\u6d88\u606f\u5df2\u5e7f\u64ad&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9996\u9875&#xff08;\u5305\u542bEventSource\u6f14\u793a&#xff09;<\/span><br \/>\n<span class=\"token keyword\">func<\/span> <span class=\"token function\">indexHandler<\/span><span class=\"token punctuation\">(<\/span>w http<span class=\"token punctuation\">.<\/span>ResponseWriter<span class=\"token punctuation\">,<\/span> r <span class=\"token operator\">*<\/span>http<span class=\"token punctuation\">.<\/span>Request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    html <span class=\"token operator\">:&#061;<\/span> <span class=\"token string\">&#096;&lt;!DOCTYPE html&gt;<br \/>\n&lt;html lang&#061;&#034;zh-CN&#034;&gt;<br \/>\n&lt;head&gt;<br \/>\n    &lt;meta charset&#061;&#034;UTF-8&#034;&gt;<br \/>\n    &lt;meta name&#061;&#034;viewport&#034; content&#061;&#034;width&#061;device-width, initial-scale&#061;1.0&#034;&gt;<br \/>\n    &lt;title&gt;SSE\u5b9e\u65f6\u901a\u77e5\u6f14\u793a&lt;\/title&gt;<br \/>\n    &lt;style&gt;<br \/>\n        body { font-family: &#039;Microsoft YaHei&#039;, sans-serif; max-width: 800px; margin: 0 auto; padding: 20px; background: #f5f5f5; }<br \/>\n        h1 { color: #333; border-bottom: 2px solid #4CAF50; padding-bottom: 10px; }<br \/>\n        #messages { background: white; border: 1px solid #ddd; border-radius: 5px; padding: 15px; height: 400px; overflow-y: auto; margin: 20px 0; }<br \/>\n        .message { padding: 8px; margin: 5px 0; border-left: 3px solid #4CAF50; background: #f9f9f9; }<br \/>\n        .message.error { border-left-color: #f44336; }<br \/>\n        .message.info { border-left-color: #2196F3; }<br \/>\n        button { background: #4CAF50; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; margin: 5px; }<br \/>\n        button:hover { background: #45a049; }<br \/>\n        #status { padding: 10px; border-radius: 5px; margin: 10px 0; }<br \/>\n        .connected { background: #d4edda; color: #155724; }<br \/>\n        .disconnected { background: #f8d7da; color: #721c24; }<br \/>\n    &lt;\/style&gt;<br \/>\n&lt;\/head&gt;<br \/>\n&lt;body&gt;<br \/>\n    &lt;h1&gt;&#x1f514; SSE\u5b9e\u65f6\u901a\u77e5\u6f14\u793a&lt;\/h1&gt;<br \/>\n    &lt;div id&#061;&#034;status&#034; class&#061;&#034;disconnected&#034;&gt;\u274c \u672a\u8fde\u63a5&lt;\/div&gt;<br \/>\n    &lt;div&gt;<br \/>\n        &lt;button onclick&#061;&#034;connectSSE()&#034;&gt;\u8fde\u63a5SSE&lt;\/button&gt;<br \/>\n        &lt;button onclick&#061;&#034;disconnectSSE()&#034;&gt;\u65ad\u5f00\u8fde\u63a5&lt;\/button&gt;<br \/>\n        &lt;button onclick&#061;&#034;sendTestMessage()&#034;&gt;\u53d1\u9001\u6d4b\u8bd5\u6d88\u606f&lt;\/button&gt;<br \/>\n    &lt;\/div&gt;<br \/>\n    &lt;h3&gt;\u5b9e\u65f6\u6d88\u606f&#xff1a;&lt;\/h3&gt;<br \/>\n    &lt;div id&#061;&#034;messages&#034;&gt;&lt;\/div&gt;<\/p>\n<p>    &lt;script&gt;<br \/>\n        let eventSource &#061; null;<\/p>\n<p>        function connectSSE() {<br \/>\n            if (eventSource) {<br \/>\n                eventSource.close();<br \/>\n            }<\/p>\n<p>            eventSource &#061; new EventSource(&#039;\/events&#039;);<br \/>\n            const statusDiv &#061; document.getElementById(&#039;status&#039;);<br \/>\n            statusDiv.className &#061; &#039;connected&#039;;<br \/>\n            statusDiv.innerHTML &#061; &#039;\u2705 \u5df2\u8fde\u63a5SSE\u670d\u52a1&#039;;<\/p>\n<p>            \/\/ \u76d1\u542c\u9ed8\u8ba4\u6d88\u606f<br \/>\n            eventSource.onmessage &#061; function(event) {<br \/>\n                addMessage(&#039;\u9ed8\u8ba4\u6d88\u606f&#039;, event.data, &#039;info&#039;);<br \/>\n            };<\/p>\n<p>            \/\/ \u76d1\u542c\u81ea\u5b9a\u4e49\u4e8b\u4ef6<br \/>\n            eventSource.addEventListener(&#039;welcome&#039;, function(event) {<br \/>\n                addMessage(&#039;\u6b22\u8fce&#039;, event.data, &#039;info&#039;);<br \/>\n            });<\/p>\n<p>            eventSource.addEventListener(&#039;notification&#039;, function(event) {<br \/>\n                addMessage(&#039;\u901a\u77e5&#039;, event.data, &#039;&#039;);<br \/>\n            });<\/p>\n<p>            eventSource.addEventListener(&#039;update&#039;, function(event) {<br \/>\n                addMessage(&#039;\u66f4\u65b0&#039;, event.data, &#039;info&#039;);<br \/>\n            });<\/p>\n<p>            eventSource.onerror &#061; function(error) {<br \/>\n                statusDiv.className &#061; &#039;disconnected&#039;;<br \/>\n                statusDiv.innerHTML &#061; &#039;\u274c \u8fde\u63a5\u65ad\u5f00&#xff0c;\u6b63\u5728\u81ea\u52a8\u91cd\u8fde&#8230;&#039;;<br \/>\n                addMessage(&#039;\u9519\u8bef&#039;, &#039;SSE\u8fde\u63a5\u9519\u8bef&#039;, &#039;error&#039;);<br \/>\n            };<br \/>\n        }<\/p>\n<p>        function disconnectSSE() {<br \/>\n            if (eventSource) {<br \/>\n                eventSource.close();<br \/>\n                eventSource &#061; null;<br \/>\n                const statusDiv &#061; document.getElementById(&#039;status&#039;);<br \/>\n                statusDiv.className &#061; &#039;disconnected&#039;;<br \/>\n                statusDiv.innerHTML &#061; &#039;\u274c \u5df2\u624b\u52a8\u65ad\u5f00\u8fde\u63a5&#039;;<br \/>\n            }<br \/>\n        }<\/p>\n<p>        function sendTestMessage() {<br \/>\n            fetch(&#039;\/api\/send&#039;, {<br \/>\n                method: &#039;POST&#039;,<br \/>\n                headers: { &#039;Content-Type&#039;: &#039;application\/json&#039; },<br \/>\n                body: JSON.stringify({<br \/>\n                    event: &#039;notification&#039;,<br \/>\n                    data: { message: &#039;\u8fd9\u662f\u4e00\u6761\u6d4b\u8bd5\u901a\u77e5&#039;, time: new Date().toLocaleString() }<br \/>\n                })<br \/>\n            }).then(res &#061;&gt; res.json()).then(data &#061;&gt; {<br \/>\n                console.log(&#039;\u53d1\u9001\u7ed3\u679c:&#039;, data);<br \/>\n            });<br \/>\n        }<\/p>\n<p>        function addMessage(type, data, className) {<br \/>\n            const messagesDiv &#061; document.getElementById(&#039;messages&#039;);<br \/>\n            const msgDiv &#061; document.createElement(&#039;div&#039;);<br \/>\n            msgDiv.className &#061; &#039;message &#039; &#043; className;<\/p>\n<p>            try {<br \/>\n                const dataObj &#061; JSON.parse(data);<br \/>\n                msgDiv.innerHTML &#061; &#039;&lt;strong&gt;[&#039; &#043; new Date().toLocaleTimeString() &#043; &#039;] &#039; &#043; type &#043; &#039;:&lt;\/strong&gt; &#039; &#043; JSON.stringify(dataObj, null, 2);<br \/>\n            } catch(e) {<br \/>\n                msgDiv.innerHTML &#061; &#039;&lt;strong&gt;[&#039; &#043; new Date().toLocaleTimeString() &#043; &#039;] &#039; &#043; type &#043; &#039;:&lt;\/strong&gt; &#039; &#043; data;<br \/>\n            }<\/p>\n<p>            messagesDiv.appendChild(msgDiv);<br \/>\n            messagesDiv.scrollTop &#061; messagesDiv.scrollHeight;<br \/>\n        }<\/p>\n<p>        \/\/ \u81ea\u52a8\u8fde\u63a5<br \/>\n        connectSSE();<br \/>\n    &lt;\/script&gt;<br \/>\n&lt;\/body&gt;<br \/>\n&lt;\/html&gt;&#096;<\/span><\/p>\n<p>    w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Content-Type&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/html; charset&#061;utf-8&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token function\">byte<\/span><span class=\"token punctuation\">(<\/span>html<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521b\u5efaSSE\u4ee3\u7406<\/span><br \/>\n    broker <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">NewSSEBroker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">go<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u542f\u52a8\u5b9a\u65f6\u63a8\u9001&#xff08;\u6a21\u62df\u5b9e\u65f6\u6570\u636e&#xff09;<\/span><br \/>\n    <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><br \/>\n        ticker <span class=\"token operator\">:&#061;<\/span> time<span class=\"token punctuation\">.<\/span><span class=\"token function\">NewTicker<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">defer<\/span> ticker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> <span class=\"token keyword\">range<\/span> ticker<span class=\"token punctuation\">.<\/span>C <span class=\"token punctuation\">{<\/span><br \/>\n            msg <span class=\"token operator\">:&#061;<\/span> SSEMessage<span class=\"token punctuation\">{<\/span><br \/>\n                Event<span class=\"token punctuation\">:<\/span> <span class=\"token string\">&#034;update&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                Data<span class=\"token punctuation\">:<\/span> <span class=\"token keyword\">map<\/span><span class=\"token punctuation\">[<\/span><span class=\"token builtin\">string<\/span><span class=\"token punctuation\">]<\/span><span class=\"token keyword\">interface<\/span><span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token string\">&#034;time&#034;<\/span><span class=\"token punctuation\">:<\/span>    time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Format<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;2006-01-02 15:04:05&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token string\">&#034;value&#034;<\/span><span class=\"token punctuation\">:<\/span>   rand<span class=\"token punctuation\">.<\/span><span class=\"token function\">Intn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                    <span class=\"token string\">&#034;clients&#034;<\/span><span class=\"token punctuation\">:<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">ClientCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                ID<span class=\"token punctuation\">:<\/span> fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d&#034;<\/span><span class=\"token punctuation\">,<\/span> time<span class=\"token punctuation\">.<\/span><span class=\"token function\">Now<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">UnixNano<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">Broadcast<\/span><span class=\"token punctuation\">(<\/span>msg<span class=\"token punctuation\">)<\/span><br \/>\n            log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b9a\u65f6\u63a8\u9001: update \u4e8b\u4ef6 (\u5728\u7ebf: %d)&#034;<\/span><span class=\"token punctuation\">,<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">ClientCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6ce8\u518c\u8def\u7531<\/span><br \/>\n    http<span class=\"token punctuation\">.<\/span><span class=\"token function\">HandleFunc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/&#034;<\/span><span class=\"token punctuation\">,<\/span> indexHandler<span class=\"token punctuation\">)<\/span><br \/>\n    http<span class=\"token punctuation\">.<\/span><span class=\"token function\">HandleFunc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/events&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sseHandler<\/span><span class=\"token punctuation\">(<\/span>broker<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    http<span class=\"token punctuation\">.<\/span><span class=\"token function\">HandleFunc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/api\/send&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sendMessageHandler<\/span><span class=\"token punctuation\">(<\/span>broker<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5065\u5eb7\u68c0\u67e5<\/span><br \/>\n    http<span class=\"token punctuation\">.<\/span><span class=\"token function\">HandleFunc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/health&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">func<\/span><span class=\"token punctuation\">(<\/span>w http<span class=\"token punctuation\">.<\/span>ResponseWriter<span class=\"token punctuation\">,<\/span> r <span class=\"token operator\">*<\/span>http<span class=\"token punctuation\">.<\/span>Request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        w<span class=\"token punctuation\">.<\/span><span class=\"token function\">Write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token function\">byte<\/span><span class=\"token punctuation\">(<\/span>fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Sprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;OK (SSE\u5ba2\u6237\u7aef: %d)&#034;<\/span><span class=\"token punctuation\">,<\/span> broker<span class=\"token punctuation\">.<\/span><span class=\"token function\">ClientCount<\/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><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SSE\u670d\u52a1\u7aef\u63a8\u9001\u4e8b\u4ef6\u6f14\u793a\u542f\u52a8&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bbf\u95ee\u5730\u5740: http:\/\/localhost:8080&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;SSE\u7aef\u70b9: http:\/\/localhost:8080\/events&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u53d1\u9001\u6d88\u606f: POST http:\/\/localhost:8080\/api\/send&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5065\u5eb7\u68c0\u67e5: http:\/\/localhost:8080\/health&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u4f18\u96c5\u5173\u95ed<\/span><br \/>\n    <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><br \/>\n        sigChan <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">make<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">chan<\/span> os<span class=\"token punctuation\">.<\/span>Signal<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        signal<span class=\"token punctuation\">.<\/span><span class=\"token function\">Notify<\/span><span class=\"token punctuation\">(<\/span>sigChan<span class=\"token punctuation\">,<\/span> syscall<span class=\"token punctuation\">.<\/span>SIGINT<span class=\"token punctuation\">,<\/span> syscall<span class=\"token punctuation\">.<\/span>SIGTERM<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token operator\">&lt;-<\/span>sigChan<br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6536\u5230\u5173\u95ed\u4fe1\u53f7&#xff0c;\u9000\u51fa&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        os<span class=\"token punctuation\">.<\/span><span class=\"token function\">Exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>    log<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fatal<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token punctuation\">.<\/span><span class=\"token function\">ListenAndServe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;:8080&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">nil<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u5f00\u53d1\u75db\u70b9\u4e0e\u62a5\u9519\u907f\u5751\u6307\u5357<\/h3>\n<h4>\u75db\u70b91&#xff1a;SSE\u8fde\u63a5\u7acb\u5373\u65ad\u5f00<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;\u524d\u7aefEventSource\u8fde\u63a5\u540e\u7acb\u5373\u89e6\u53d1onerror&#xff0c;\u7136\u540e\u4e0d\u65ad\u91cd\u8fde\u3002<\/p>\n<p>\u539f\u56e0\u5206\u6790&#xff1a;<\/p>\n<ul>\n<li>\u670d\u52a1\u7aef\u6ca1\u6709\u6b63\u786e\u8bbe\u7f6e\u54cd\u5e94\u5934<\/li>\n<li>\u670d\u52a1\u7aef\u5728\u6ca1\u6709\u53d1\u9001\u4efb\u4f55\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u5173\u95ed\u4e86\u8fde\u63a5<\/li>\n<li>\u4ee3\u7406\u670d\u52a1\u5668&#xff08;\u5982Nginx&#xff09;\u7f13\u51b2\u4e86\u54cd\u5e94<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ 1. \u786e\u4fdd\u8bbe\u7f6e\u6b63\u786e\u7684\u54cd\u5e94\u5934<\/span><br \/>\nw<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Content-Type&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;text\/event-stream&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nw<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Cache-Control&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;no-cache&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nw<span class=\"token punctuation\">.<\/span><span class=\"token function\">Header<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Connection&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;keep-alive&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. \u53d1\u9001\u521d\u59cb\u6ce8\u91ca\u4fdd\u6301\u8fde\u63a5<\/span><br \/>\nfmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;: SSE\u8fde\u63a5\u5df2\u5efa\u7acb\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nflusher<span class=\"token punctuation\">.<\/span><span class=\"token function\">Flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 3. Nginx\u914d\u7f6e&#xff08;\u5982\u679c\u4f7f\u7528\u4e86\u53cd\u5411\u4ee3\u7406&#xff09;<\/span><br \/>\n<span class=\"token comment\">\/\/ proxy_buffering off;<\/span><br \/>\n<span class=\"token comment\">\/\/ proxy_cache off;<\/span><\/p>\n<h4>\u75db\u70b92&#xff1a;\u6d88\u606f\u683c\u5f0f\u9519\u8bef\u5bfc\u81f4\u524d\u7aef\u65e0\u6cd5\u89e3\u6790<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;\u524d\u7aef\u6536\u4e0d\u5230\u6d88\u606f&#xff0c;\u6216\u8005\u6d88\u606f\u683c\u5f0f\u4e0d\u6b63\u786e\u3002<\/p>\n<p>\u539f\u56e0\u5206\u6790&#xff1a;SSE\u6d88\u606f\u683c\u5f0f\u8981\u6c42\u4e25\u683c&#xff0c;\u5fc5\u987b\u7a7a\u884c\u7ed3\u675f\u3002<\/p>\n<p>\u6b63\u786e\u683c\u5f0f&#xff1a;<\/p>\n<p>event: update<br \/>\ndata: {&#034;key&#034;: &#034;value&#034;}<\/p>\n<p>&#xff08;\u6ce8\u610f&#xff1a;\u5fc5\u987b\u6709\u4e24\u4e2a\u6362\u884c\u7b26&#xff09;<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;\u4f7f\u7528\u5c01\u88c5\u51fd\u6570\u786e\u4fdd\u683c\u5f0f\u6b63\u786e&#xff1a;<\/p>\n<p><span class=\"token keyword\">func<\/span> <span class=\"token function\">sendSSEMessage<\/span><span class=\"token punctuation\">(<\/span>w http<span class=\"token punctuation\">.<\/span>ResponseWriter<span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">,<\/span> data <span class=\"token builtin\">string<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    fmt<span class=\"token punctuation\">.<\/span><span class=\"token function\">Fprintf<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;event: %s\\\\ndata: %s\\\\n\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> event<span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">)<\/span><br \/>\n    w<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">(<\/span>http<span class=\"token punctuation\">.<\/span>Flusher<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">Flush<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u75db\u70b93&#xff1a;\u6d4f\u89c8\u5668\u81ea\u52a8\u91cd\u8fde\u5bfc\u81f4\u91cd\u590d\u6d88\u606f<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;\u5ba2\u6237\u7aef\u91cd\u8fde\u540e&#xff0c;\u6536\u5230\u91cd\u590d\u7684\u6d88\u606f\u3002<\/p>\n<p>\u539f\u56e0\u5206\u6790&#xff1a;\u6ca1\u6709\u4f7f\u7528Last-Event-ID\u5934\u8ffd\u8e2a\u5df2\u63a5\u6536\u7684\u6d88\u606f\u3002<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u524d\u7aef\u91cd\u8fde\u65f6\u4f1a\u53d1\u9001 Last-Event-ID \u5934<\/span><br \/>\nlastEventID <span class=\"token operator\">:&#061;<\/span> r<span class=\"token punctuation\">.<\/span>Header<span class=\"token punctuation\">.<\/span><span class=\"token function\">Get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Last-Event-ID&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u670d\u52a1\u7aef\u6839\u636elastEventID\u8fd4\u56de\u7f3a\u5931\u7684\u6d88\u606f<\/span><br \/>\n<span class=\"token keyword\">if<\/span> lastEventID <span class=\"token operator\">!&#061;<\/span> <span class=\"token string\">&#034;&#034;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4ece\u5b58\u50a8\u4e2d\u83b7\u53d6\u8be5ID\u4e4b\u540e\u7684\u6240\u6709\u6d88\u606f<\/span><br \/>\n    missedMessages <span class=\"token operator\">:&#061;<\/span> <span class=\"token function\">getMessagesAfterID<\/span><span class=\"token punctuation\">(<\/span>lastEventID<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token boolean\">_<\/span><span class=\"token punctuation\">,<\/span> msg <span class=\"token operator\">:&#061;<\/span> <span class=\"token keyword\">range<\/span> missedMessages <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">sendSSEMessage<\/span><span class=\"token punctuation\">(<\/span>w<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">.<\/span>Event<span class=\"token punctuation\">,<\/span> msg<span class=\"token punctuation\">.<\/span>Data<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u75db\u70b94&#xff1a;\u5927\u91cf\u5e76\u53d1\u8fde\u63a5\u5bfc\u81f4\u5185\u5b58\u6ea2\u51fa<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;1000&#043;\u5e76\u53d1SSE\u8fde\u63a5\u65f6&#xff0c;\u670d\u52a1\u5185\u5b58\u5360\u7528\u8fc7\u9ad8\u3002<\/p>\n<p>\u539f\u56e0\u5206\u6790&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u8fde\u63a5\u90fd\u5360\u7528\u4e00\u4e2agoroutine<\/li>\n<li>channel\u7f13\u51b2\u533a\u8bbe\u7f6e\u8fc7\u5927<\/li>\n<\/ul>\n<p>\u4f18\u5316\u65b9\u6848&#xff1a;<\/p>\n<li>\u4f7f\u7528sync.Pool\u590d\u7528\u5bf9\u8c61<\/li>\n<li>\u9650\u5236\u6bcf\u4e2a\u8fde\u63a5\u7684channel\u7f13\u51b2\u533a\u5927\u5c0f&#xff08;\u598210&#xff09;<\/li>\n<li>\u8bbe\u7f6e\u8fde\u63a5\u8d85\u65f6&#xff0c;\u81ea\u52a8\u6e05\u7406\u6b7b\u8fde\u63a5<\/li>\n<li>\u4f7f\u7528epoll\/kqueue\u4f18\u5316\u7f51\u7edcI\/O&#xff08;\u5982\u4f7f\u7528gnet\u5e93&#xff09;<\/li>\n<h3>\u5168\u6587\u603b\u7ed3&#043;\u6280\u672f\u8fdb\u9636\u5c55\u671b<\/h3>\n<h4>\u603b\u7ed3<\/h4>\n<p>\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86Go\u8bed\u8a00\u4e2d\u5b9e\u73b0SSE&#xff08;Server-Sent Events&#xff09;\u7684\u5b8c\u6574\u65b9\u6848&#xff1a;<\/p>\n<li>SSE\u534f\u8bae\u57fa\u7840&#xff1a;\u6d88\u606f\u683c\u5f0f\u3001\u54cd\u5e94\u5934\u8bbe\u7f6e<\/li>\n<li>\u4ee3\u7406\u6a21\u5f0f\u8bbe\u8ba1&#xff1a;Broker-Client\u6a21\u5f0f\u7ba1\u7406\u591a\u4e2aSSE\u8fde\u63a5<\/li>\n<li>\u5b8c\u6574\u5b9e\u73b0&#xff1a;\u5305\u542b\u670d\u52a1\u7aef\u3001\u524d\u7aefEventSource\u3001\u6d88\u606f\u5e7f\u64ad<\/li>\n<li>\u751f\u4ea7\u4f18\u5316&#xff1a;\u8fde\u63a5\u7ba1\u7406\u3001\u81ea\u52a8\u91cd\u8fde\u3001\u6d88\u606f\u8ffd\u8e2a<\/li>\n<h4>\u8fdb\u9636\u5c55\u671b<\/h4>\n<li>SSE over HTTP\/2&#xff1a;\u5229\u7528HTTP\/2\u7684\u591a\u8def\u590d\u7528&#xff0c;\u4e00\u4e2aTCP\u8fde\u63a5\u53ef\u4ee5\u540c\u65f6\u5904\u7406\u591a\u4e2aSSE\u6d41<\/li>\n<li>SSE over HTTP\/3&#xff1a;\u57fa\u4e8eQUIC\u534f\u8bae&#xff0c;\u89e3\u51b3\u961f\u5934\u963b\u585e\u95ee\u9898<\/li>\n<li>\u6d88\u606f\u6301\u4e45\u5316&#xff1a;\u5c06SSE\u6d88\u606f\u5b58\u50a8\u5230Redis\/Kafka&#xff0c;\u652f\u6301\u91cd\u8fde\u540e\u83b7\u53d6\u5386\u53f2\u6d88\u606f<\/li>\n<li>SSE\u96c6\u7fa4\u65b9\u6848&#xff1a;\u5728\u591a\u4e2a\u670d\u52a1\u5668\u5b9e\u4f8b\u95f4\u540c\u6b65SSE\u6d88\u606f&#xff08;\u4f7f\u7528Redis Pub\/Sub&#xff09;<\/li>\n<li>\u4e0eGraphQL Subscription\u5bf9\u6bd4&#xff1a;GraphQL\u7684\u8ba2\u9605\u673a\u5236\u63d0\u4f9b\u4e86\u66f4\u7075\u6d3b\u7684\u6570\u636e\u63a8\u9001\u65b9\u5f0f<\/li>\n<h3>\u53c2\u8003\u6587\u732e<\/h3>\n<li>W3C EventSource\u89c4\u8303: https:\/\/html.spec.whatwg.org\/multipage\/server-sent-events.html<\/li>\n<li>MDN EventSource API: https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/EventSource<\/li>\n<li>Go net\/http\u5b98\u65b9\u6587\u6863: https:\/\/pkg.go.dev\/net\/http<\/li>\n<li>SSE vs WebSocket\u5bf9\u6bd4: 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