{"id":127883,"date":"2024-10-26T10:00:14","date_gmt":"2024-10-26T02:00:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/127883\/"},"modified":"2024-10-26T10:00:15","modified_gmt":"2024-10-26T02:00:15","slug":"redis-%e7%86%94%e6%96%b7%e9%98%b2%e6%ad%a2%e7%b3%bb%e7%b5%b1%e5%b4%a9%e6%bd%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/127883\/","title":{"rendered":"Redis \u7194\u65b7\u9632\u6b62\u7cfb\u7d71\u5d29\u6f70"},"content":{"rendered":"<h1 id=\"redis-%e7%86%94%e6%96%b7%e9%98%b2%e6%ad%a2%e7%b3%bb%e7%b5%b1%e5%b4%a9%e6%bd%b0-acmstolPbF\">Redis \u7194\u65b7\u9632\u6b62\u7cfb\u7d71\u5d29\u6f70<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u7db2\u7d61\u61c9\u7528\u4e2d\uff0c\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u7528\u6027\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u7528\u6236\u6578\u91cf\u7684\u589e\u52a0\uff0c\u7cfb\u7d71\u9762\u81e8\u7684\u58d3\u529b\u4e5f\u96a8\u4e4b\u4e0a\u5347\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u670d\u52d9\u5d29\u6f70\u6216\u6027\u80fd\u4e0b\u964d\u3002\u70ba\u4e86\u61c9\u5c0d\u9019\u4e9b\u6311\u6230\uff0c\u7194\u65b7\u5668\u6a21\u5f0f\uff08Circuit Breaker Pattern\uff09\u6210\u70ba\u4e86\u4e00\u7a2e\u6709\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u6578\u64da\u5eab\uff0c\u80fd\u5920\u5728\u7194\u65b7\u5668\u6a21\u5f0f\u4e2d\u767c\u63ee\u91cd\u8981\u4f5c\u7528\uff0c\u5e6b\u52a9\u9632\u6b62\u7cfb\u7d71\u5d29\u6f70\u3002<\/p>\n<h2 id=\"%e7%86%94%e6%96%b7%e5%99%a8%e6%a8%a1%e5%bc%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-acmstolPbF\">\u7194\u65b7\u5668\u6a21\u5f0f\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u7194\u65b7\u5668\u6a21\u5f0f\u7684\u6838\u5fc3\u601d\u60f3\u662f\u76e3\u63a7\u7cfb\u7d71\u7684\u5065\u5eb7\u72c0\u614b\uff0c\u7576\u6aa2\u6e2c\u5230\u67d0\u500b\u670d\u52d9\u7684\u5931\u6557\u7387\u8d85\u904e\u9810\u8a2d\u95be\u503c\u6642\uff0c\u7194\u65b7\u5668\u6703\u66ab\u6642\u963b\u6b62\u5c0d\u8a72\u670d\u52d9\u7684\u8acb\u6c42\uff0c\u5f9e\u800c\u907f\u514d\u7cfb\u7d71\u7684\u9032\u4e00\u6b65\u5d29\u6f70\u3002\u9019\u4e00\u6a21\u5f0f\u53ef\u4ee5\u6709\u6548\u5730\u4fdd\u8b77\u7cfb\u7d71\uff0c\u8b93\u5176\u5728\u9762\u5c0d\u9ad8\u8ca0\u8f09\u6216\u6545\u969c\u6642\u4ecd\u80fd\u4fdd\u6301\u4e00\u5b9a\u7684\u53ef\u7528\u6027\u3002<\/p>\n<h2 id=\"redis-%e5%9c%a8%e7%86%94%e6%96%b7%e5%99%a8%e6%a8%a1%e5%bc%8f%e4%b8%ad%e7%9a%84%e6%87%89%e7%94%a8-acmstolPbF\">Redis \u5728\u7194\u65b7\u5668\u6a21\u5f0f\u4e2d\u7684\u61c9\u7528<\/h2>\n<p>Redis \u662f\u4e00\u500b\u9ad8\u6027\u80fd\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u56e0\u5176\u5feb\u901f\u7684\u8b80\u5beb\u901f\u5ea6\u548c\u9748\u6d3b\u7684\u6578\u64da\u7d50\u69cb\u800c\u53d7\u5230\u5ee3\u6cdb\u4f7f\u7528\u3002\u5728\u7194\u65b7\u5668\u6a21\u5f0f\u4e2d\uff0cRedis \u53ef\u4ee5\u7528\u4f86\u5b58\u5132\u670d\u52d9\u7684\u5065\u5eb7\u72c0\u614b\u548c\u8acb\u6c42\u8a08\u6578\uff0c\u5f9e\u800c\u5be6\u73fe\u5c0d\u670d\u52d9\u7684\u76e3\u63a7\u548c\u63a7\u5236\u3002<\/p>\n<h3 id=\"%e5%af%a6%e7%8f%be%e7%86%94%e6%96%b7%e5%99%a8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%ad%a5%e9%a9%9f-acmstolPbF\">\u5be6\u73fe\u7194\u65b7\u5668\u7684\u57fa\u672c\u6b65\u9a5f<\/h3>\n<ul>\n<li><strong>\u72c0\u614b\u76e3\u63a7\uff1a<\/strong>\u4f7f\u7528 Redis \u5b58\u5132\u670d\u52d9\u7684\u8acb\u6c42\u8a08\u6578\u548c\u5931\u6557\u8a08\u6578\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u500b\u9375\u4f86\u8a18\u9304\u8acb\u6c42\u7684\u7e3d\u6578\uff0c\u53e6\u4e00\u500b\u9375\u4f86\u8a18\u9304\u5931\u6557\u7684\u8acb\u6c42\u6578\u3002<\/li>\n<li><strong>\u95be\u503c\u8a2d\u5b9a\uff1a<\/strong>\u6839\u64da\u696d\u52d9\u9700\u6c42\u8a2d\u5b9a\u5931\u6557\u7387\u7684\u95be\u503c\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u5931\u6557\u7387\u8d85\u904e 50%\uff0c\u5247\u89f8\u767c\u7194\u65b7\u3002<\/li>\n<li><strong>\u7194\u65b7\u908f\u8f2f\uff1a<\/strong>\u7576\u5931\u6557\u7387\u8d85\u904e\u95be\u503c\u6642\uff0c\u5c07\u670d\u52d9\u72c0\u614b\u8a2d\u7f6e\u70ba\u201c\u7194\u65b7\u201d\uff0c\u4e26\u5728\u4e00\u6bb5\u6642\u9593\u5f8c\u81ea\u52d5\u6062\u5fa9\u6aa2\u67e5\u3002<\/li>\n<li><strong>\u6062\u5fa9\u6aa2\u67e5\uff1a<\/strong>\u5728\u7194\u65b7\u72c0\u614b\u4e0b\uff0c\u5b9a\u671f\u6aa2\u67e5\u670d\u52d9\u662f\u5426\u6062\u5fa9\u6b63\u5e38\uff0c\u82e5\u6062\u5fa9\u5247\u91cd\u65b0\u555f\u7528\u8acb\u6c42\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-acmstolPbF\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<pre><code>\nconst redis = require('redis');\nconst client = redis.createClient();\n\nconst SERVICE_KEY = 'service_status';\nconst REQUEST_COUNT_KEY = 'request_count';\nconst FAILURE_COUNT_KEY = 'failure_count';\nconst THRESHOLD = 0.5; \/\/ 50% \u5931\u6557\u7387\nconst TIMEOUT = 60000; \/\/ 60\u79d2\u7194\u65b7\u6642\u9593\n\nasync function requestService() {\n    const requestCount = await client.incr(REQUEST_COUNT_KEY);\n    try {\n        \/\/ \u6a21\u64ec\u670d\u52d9\u8acb\u6c42\n        const response = await callExternalService();\n        \/\/ \u8acb\u6c42\u6210\u529f\uff0c\u91cd\u7f6e\u5931\u6557\u8a08\u6578\n        await client.set(FAILURE_COUNT_KEY, 0);\n        return response;\n    } catch (error) {\n        \/\/ \u8acb\u6c42\u5931\u6557\uff0c\u589e\u52a0\u5931\u6557\u8a08\u6578\n        await client.incr(FAILURE_COUNT_KEY);\n        const failureCount = await client.get(FAILURE_COUNT_KEY);\n        if (failureCount \/ requestCount &gt; THRESHOLD) {\n            await client.set(SERVICE_KEY, 'CIRCUIT_BREAKER');\n            setTimeout(() =&gt; {\n                client.set(SERVICE_KEY, 'CLOSED');\n            }, TIMEOUT);\n        }\n        throw error;\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-acmstolPbF\">\u7d50\u8ad6<\/h2>\n<p>\u7194\u65b7\u5668\u6a21\u5f0f\u662f\u4e00\u7a2e\u6709\u6548\u7684\u9632\u6b62\u7cfb\u7d71\u5d29\u6f70\u7684\u7b56\u7565\uff0c\u800c Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u6578\u64da\u5b58\u5132\u89e3\u6c7a\u65b9\u6848\uff0c\u80fd\u5920\u5728\u9019\u4e00\u904e\u7a0b\u4e2d\u767c\u63ee\u91cd\u8981\u4f5c\u7528\u3002\u901a\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u5be6\u73fe\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5229\u7528 Redis \u4f86\u76e3\u63a7\u670d\u52d9\u7684\u5065\u5eb7\u72c0\u614b\uff0c\u53ca\u6642\u97ff\u61c9\u7cfb\u7d71\u7684\u7570\u5e38\u60c5\u6cc1\uff0c\u5f9e\u800c\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u7528\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Redis\u7194\u65b7\u9632\u6b62\u7cfb\u7d71\u5d29\u6f70\u7684\u7b56\u7565\uff0c\u63d0\u5347\u61c9\u7528\u7a69\u5b9a\u6027\uff0c\u78ba\u4fdd\u9ad8\u6548\u80fd\u548c\u53ef\u9760\u6027\uff0c\u907f\u514d\u670d\u52d9\u4e2d\u65b7\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-127883","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/127883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=127883"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/127883\/revisions"}],"predecessor-version":[{"id":127884,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/127883\/revisions\/127884"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=127883"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=127883"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=127883"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}