{"id":29385,"date":"2025-04-20T08:25:58","date_gmt":"2025-04-20T00:25:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/29385.html"},"modified":"2025-04-20T08:25:58","modified_gmt":"2025-04-20T00:25:58","slug":"%e3%80%90fastapi%e3%80%91%e5%ae%9e%e7%8e%b0%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%90%91%e5%ae%a2%e6%88%b7%e7%ab%af%e5%8f%91%e9%80%81sse%ef%bc%88server-sent-events%ef%bc%89%e5%b9%bf%e6%92%ad","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/29385.html","title":{"rendered":"\u3010FastAPI\u3011\u5b9e\u73b0\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001SSE\uff08Server-Sent Events\uff09\u5e7f\u64ad"},"content":{"rendered":"<p>\u5728FastAPI\u4e2d\u5b9e\u73b0\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001SSE&#xff08;Server-Sent Events&#xff09;\u5e7f\u64ad&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\u3002SSE\u662f\u4e00\u79cd\u670d\u52a1\u5668\u63a8\u9001\u6280\u672f&#xff0c;\u5141\u8bb8\u670d\u52a1\u5668\u53d1\u9001\u5b9e\u65f6\u6570\u636e\u5230\u5ba2\u6237\u7aef&#xff0c;\u901a\u5e38\u7528\u4e8e\u521b\u5efa\u5b9e\u65f6\u66f4\u65b0\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<h4>1. \u5b89\u88c5\u5fc5\u8981\u7684\u4f9d\u8d56<\/h4>\n<p>\u9996\u5148&#xff0c;\u786e\u4fdd\u4f60\u5df2\u7ecf\u5b89\u88c5\u4e86FastAPI\u548cUvicorn&#xff1a;<\/p>\n<p>pip <span class=\"token function\">install<\/span> fastapi uvicorn<\/p>\n<h4>2. FastAPI\u670d\u52a1\u5668\u5b9e\u73b0SSE\u5e7f\u64ad<\/h4>\n<p>FastAPI\u4f7f\u7528StreamingResponse\u53ef\u4ee5\u5b9e\u73b0SSE\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5b9e\u73b0SSE\u5e7f\u64ad\u7684\u7b80\u5355\u4f8b\u5b50&#xff0c;\u670d\u52a1\u5668\u4f1a\u5b9a\u671f\u5411\u6240\u6709\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u5e7f\u64ad\u6d88\u606f\u3002<\/p>\n<p><span class=\"token keyword\">from<\/span> fastapi <span class=\"token keyword\">import<\/span> FastAPI<span class=\"token punctuation\">,<\/span> Request<br \/>\n<span class=\"token keyword\">from<\/span> fastapi<span class=\"token punctuation\">.<\/span>responses <span class=\"token keyword\">import<\/span> StreamingResponse<br \/>\n<span class=\"token keyword\">from<\/span> typing <span class=\"token keyword\">import<\/span> List<br \/>\n<span class=\"token keyword\">import<\/span> asyncio<\/p>\n<p>app <span class=\"token operator\">&#061;<\/span> FastAPI<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u7528\u4e8e\u4fdd\u5b58\u6240\u6709\u7684\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\nclients<span class=\"token punctuation\">:<\/span> List<span class=\"token punctuation\">[<\/span>asyncio<span class=\"token punctuation\">.<\/span>Queue<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p><span class=\"token comment\"># SSE\u751f\u6210\u5668&#xff0c;\u7528\u4e8e\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u4e8b\u4ef6\u6d41<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">event_generator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    queue <span class=\"token operator\">&#061;<\/span> asyncio<span class=\"token punctuation\">.<\/span>Queue<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u6bcf\u4e2a\u5ba2\u6237\u7aef\u62e5\u6709\u81ea\u5df1\u7684\u6d88\u606f\u961f\u5217<\/span><br \/>\n    clients<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">try<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            data <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">await<\/span> queue<span class=\"token punctuation\">.<\/span>get<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u7b49\u5f85\u65b0\u6d88\u606f<\/span><br \/>\n            <span class=\"token keyword\">yield<\/span> <span class=\"token string-interpolation\"><span class=\"token string\">f&#034;data: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>data<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">\\\\n\\\\n&#034;<\/span><\/span><br \/>\n    <span class=\"token keyword\">except<\/span> asyncio<span class=\"token punctuation\">.<\/span>CancelledError<span class=\"token punctuation\">:<\/span><br \/>\n        clients<span class=\"token punctuation\">.<\/span>remove<span class=\"token punctuation\">(<\/span>queue<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5\u65f6\u79fb\u9664\u5176\u961f\u5217<\/span><br \/>\n        <span class=\"token keyword\">raise<\/span><\/p>\n<p><span class=\"token comment\"># SSE endpoint&#xff0c;\u7528\u4e8e\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\n<span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/sse&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">sse<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">:<\/span> Request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token comment\"># \u8fd4\u56deSSE\u6d41<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> StreamingResponse<span class=\"token punctuation\">(<\/span>event_generator<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> media_type<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;text\/event-stream&#034;<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># \u5e7f\u64ad\u6d88\u606f\u5230\u6240\u6709\u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">broadcast_message<\/span><span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">str<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> queue <span class=\"token keyword\">in<\/span> clients<span class=\"token punctuation\">:<\/span><br \/>\n        <span class=\"token keyword\">await<\/span> queue<span class=\"token punctuation\">.<\/span>put<span class=\"token punctuation\">(<\/span>message<span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u5c06\u6d88\u606f\u653e\u5165\u6240\u6709\u5ba2\u6237\u7aef\u7684\u961f\u5217\u4e2d<\/span><\/p>\n<p><span class=\"token comment\"># \u5b9a\u671f\u53d1\u9001\u5e7f\u64ad\u6d88\u606f<\/span><br \/>\n<span class=\"token decorator annotation punctuation\">&#064;app<span class=\"token punctuation\">.<\/span>on_event<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;startup&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">startup_event<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    <span class=\"token keyword\">async<\/span> <span class=\"token keyword\">def<\/span> <span class=\"token function\">send_messages<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">await<\/span> asyncio<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\"># \u6bcf5\u79d2\u53d1\u9001\u4e00\u6b21\u6d88\u606f<\/span><br \/>\n            <span class=\"token keyword\">await<\/span> broadcast_message<span class=\"token punctuation\">(<\/span><span class=\"token string-interpolation\"><span class=\"token string\">f&#034;Server message: <\/span><span class=\"token interpolation\"><span class=\"token punctuation\">{<\/span>count<span class=\"token punctuation\">}<\/span><\/span><span class=\"token string\">&#034;<\/span><\/span><span class=\"token punctuation\">)<\/span><br \/>\n            count <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><\/p>\n<p>    asyncio<span class=\"token punctuation\">.<\/span>create_task<span class=\"token punctuation\">(<\/span>send_messages<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<h4>3. \u5ba2\u6237\u7aef\u5b9e\u73b0<\/h4>\n<p>\u5ba2\u6237\u7aef\u53ef\u4ee5\u4f7f\u7528EventSource\u5bf9\u8c61\u6765\u63a5\u6536SSE\u4e8b\u4ef6\u6d41\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684HTML\u5ba2\u6237\u7aef\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token doctype\"><span class=\"token punctuation\">&lt;!<\/span><span class=\"token doctype-tag\">DOCTYPE<\/span> <span class=\"token name\">html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>SSE Demo<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>title<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>head<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>h1<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>Server-Sent Events<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>h1<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>div<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>messages<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>div<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token script\"><span class=\"token language-javascript\"><br \/>\n        <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\">&#034;\/sse&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        eventSource<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            <span class=\"token keyword\">const<\/span> newMessage <span class=\"token operator\">&#061;<\/span> document<span class=\"token punctuation\">.<\/span><span class=\"token function\">createElement<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;div&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            newMessage<span class=\"token punctuation\">.<\/span>textContent <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">;<\/span><br \/>\n            document<span class=\"token punctuation\">.<\/span><span class=\"token function\">getElementById<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;messages&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">appendChild<\/span><span class=\"token punctuation\">(<\/span>newMessage<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>        eventSource<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 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\">&#034;Error occurred or connection closed.&#034;<\/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    <\/span><\/span><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>script<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>body<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>html<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<h4>4. \u8fd0\u884cFastAPI\u670d\u52a1\u5668<\/h4>\n<p>\u4f7f\u7528Uvicorn\u8fd0\u884c\u670d\u52a1\u5668&#xff1a;<\/p>\n<p>uvicorn main:app <span class=\"token parameter variable\">&#8211;reload<\/span><\/p>\n<p>\u8fd9\u6837&#xff0c;\u670d\u52a1\u5668\u4f1a\u6bcf5\u79d2\u5411\u6240\u6709\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u5e7f\u64ad\u6d88\u606f\u3002\u5ba2\u6237\u7aef\u53ea\u9700\u8981\u8bbf\u95ee\/sse\u5373\u53ef\u5efa\u7acb\u4e0e\u670d\u52a1\u5668\u7684SSE\u8fde\u63a5&#xff0c;\u5e76\u5b9e\u65f6\u63a5\u6536\u670d\u52a1\u5668\u63a8\u9001\u7684\u6d88\u606f\u3002<\/p>\n<h4>\u5173\u952e\u70b9\u8bf4\u660e&#xff1a;<\/h4>\n<ul>\n<li>SSE&#xff08;Server-Sent Events&#xff09;&#xff1a;\u670d\u52a1\u5668\u901a\u8fc7text\/event-stream\u5411\u5ba2\u6237\u7aef\u63a8\u9001\u6570\u636e&#xff0c;\u5ba2\u6237\u7aef\u901a\u8fc7EventSource\u63a5\u6536\u3002<\/li>\n<li>\u5e7f\u64ad\u5b9e\u73b0&#xff1a;\u5c06\u6d88\u606f\u653e\u5165\u6240\u6709\u5ba2\u6237\u7aef\u7684\u961f\u5217\u4e2d&#xff0c;\u786e\u4fdd\u6bcf\u4e2a\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u90fd\u80fd\u63a5\u6536\u5230\u6d88\u606f\u3002<\/li>\n<li>StreamingResponse&#xff1a;\u7528\u4e8e\u6301\u7eed\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u6d41\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u6837&#xff0c;\u4f60\u5c31\u53ef\u4ee5\u5728FastAPI\u4e2d\u5b9e\u73b0\u4e00\u4e2aSSE\u5e7f\u64ad\u529f\u80fd\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb2.1k\u6b21\uff0c\u70b9\u8d5e3\u6b21\uff0c\u6536\u85cf11\u6b21\u3002\u5728FastAPI\u4e2d\u5b9e\u73b0\u670d\u52a1\u5668\u5411\u5ba2\u6237\u7aef\u53d1\u9001SSE\uff08Server-Sent 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