{"id":188256,"date":"2024-11-11T21:08:24","date_gmt":"2024-11-11T13:08:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/188256\/"},"modified":"2024-11-11T21:08:25","modified_gmt":"2024-11-11T13:08:25","slug":"%e8%ab%87%e8%ab%87redis%e9%9a%8a%e5%88%97%e4%b8%ad%e9%8e%96%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7%ef%bc%88redis%e9%9a%8a%e5%88%97%e9%9c%80%e8%a6%81%e5%8a%a0%e9%8e%96%e5%97%8e%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/188256\/","title":{"rendered":"\u8ac7\u8ac7Redis\u968a\u5217\u4e2d\u9396\u7684\u91cd\u8981\u6027\uff08redis\u968a\u5217\u9700\u8981\u52a0\u9396\u55ce\uff09"},"content":{"rendered":"<h1 id=\"%e8%ab%87%e8%ab%87redis%e9%9a%8a%e5%88%97%e4%b8%ad%e9%8e%96%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7%ef%bc%88redis%e9%9a%8a%e5%88%97%e9%9c%80%e8%a6%81%e5%8a%a0%e9%8e%96%e5%97%8e%ef%bc%89-jPUXPfyirj\">\u8ac7\u8ac7Redis\u968a\u5217\u4e2d\u9396\u7684\u91cd\u8981\u6027\uff08redis\u968a\u5217\u9700\u8981\u52a0\u9396\u55ce\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0cRedis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u6578\u64da\u7d50\u69cb\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\uff0c\u7279\u5225\u662f\u5728\u968a\u5217\u7ba1\u7406\u65b9\u9762\u3002Redis\u7684\u968a\u5217\u529f\u80fd\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u8f15\u9b06\u5730\u5be6\u73fe\u4efb\u52d9\u6392\u7a0b\u548c\u6d88\u606f\u50b3\u905e\u3002\u7136\u800c\uff0c\u7576\u591a\u500b\u9032\u7a0b\u6216\u7dda\u7a0b\u540c\u6642\u8a2a\u554f\u540c\u4e00\u500b\u968a\u5217\u6642\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u5c31\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u554f\u984c\u3002\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u9396\u7684\u4f7f\u7528\u4fbf\u986f\u5f97\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e9%8e%96%ef%bc%9f-jPUXPfyirj\">\u70ba\u4ec0\u9ebc\u9700\u8981\u9396\uff1f<\/h2>\n<p>\u5728\u591a\u7dda\u7a0b\u6216\u591a\u9032\u7a0b\u74b0\u5883\u4e2d\uff0c\u7576\u591a\u500b\u5be6\u4f8b\u540c\u6642\u5c0dRedis\u968a\u5217\u9032\u884c\u64cd\u4f5c\u6642\uff0c\u53ef\u80fd\u6703\u51fa\u73fe\u7af6\u722d\u689d\u4ef6\uff08race condition\uff09\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u6d88\u8cbb\u8005\u540c\u6642\u5f9e\u540c\u4e00\u500b\u968a\u5217\u4e2d\u53d6\u51fa\u4efb\u52d9\uff0c\u5982\u679c\u6c92\u6709\u9069\u7576\u7684\u9396\u6a5f\u5236\uff0c\u9019\u5169\u500b\u6d88\u8cbb\u8005\u53ef\u80fd\u6703\u540c\u6642\u7372\u53d6\u5230\u76f8\u540c\u7684\u4efb\u52d9\uff0c\u5c0e\u81f4\u4efb\u52d9\u91cd\u8907\u8655\u7406\u6216\u4e1f\u5931\u3002<\/p>\n<h3 id=\"%e7%ab%b6%e7%88%ad%e6%a2%9d%e4%bb%b6%e7%9a%84%e7%a4%ba%e4%be%8b-jPUXPfyirj\">\u7af6\u722d\u689d\u4ef6\u7684\u793a\u4f8b<\/h3>\n<pre><code>redis.lpop('task_queue')  # \u6d88\u8cbb\u8005A\nredis.lpop('task_queue')  # \u6d88\u8cbb\u8005B\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u4ee3\u78bc\u4e2d\uff0c\u82e5\u5169\u500b\u6d88\u8cbb\u8005\u5e7e\u4e4e\u540c\u6642\u57f7\u884clpop\u64cd\u4f5c\uff0c\u5247\u53ef\u80fd\u6703\u5c0e\u81f4\u5169\u8005\u90fd\u7372\u53d6\u5230\u76f8\u540c\u7684\u4efb\u52d9\uff0c\u9019\u6a23\u5c31\u6703\u51fa\u73fe\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"redis%e4%b8%ad%e7%9a%84%e9%8e%96%e6%a9%9f%e5%88%b6-jPUXPfyirj\">Redis\u4e2d\u7684\u9396\u6a5f\u5236<\/h2>\n<p>\u5728Redis\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u9396\u6a5f\u5236\uff0c\u6700\u5e38\u898b\u7684\u65b9\u5f0f\u662f\u4f7f\u7528SETNX\u547d\u4ee4\u3002SETNX\uff08Set if Not eXists\uff09\u547d\u4ee4\u53ef\u4ee5\u7528\u4f86\u5275\u5efa\u4e00\u500b\u9396\uff0c\u53ea\u6709\u5728\u9396\u4e0d\u5b58\u5728\u7684\u60c5\u6cc1\u4e0b\u624d\u80fd\u6210\u529f\u8a2d\u7f6e\u3002<\/p>\n<h3 id=\"%e9%8e%96%e7%9a%84%e5%af%a6%e7%8f%be%e7%a4%ba%e4%be%8b-jPUXPfyirj\">\u9396\u7684\u5be6\u73fe\u793a\u4f8b<\/h3>\n<pre><code>\n# \u7372\u53d6\u9396\ndef acquire_lock(lock_name, timeout=10):\n    identifier = str(uuid.uuid4())\n    lock = redis_client.set(lock_name, identifier, nx=True, ex=timeout)\n    return lock, identifier\n\n# \u91cb\u653e\u9396\ndef release_lock(lock_name, identifier):\n    script = \"\"\"\n    if redis.call(\"get\", KEYS[1]) == ARGV[1] then\n        return redis.call(\"del\", KEYS[1])\n    end\n    return 0\n    \"\"\"\n    redis_client.eval(script, 1, lock_name, identifier)\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0cacquire_lock\u51fd\u6578\u7528\u65bc\u7372\u53d6\u9396\uff0c\u4e26\u8a2d\u7f6e\u4e00\u500b\u8d85\u6642\u6642\u9593\uff0c\u4ee5\u9632\u6b62\u6b7b\u9396\u7684\u60c5\u6cc1\u767c\u751f\u3002release_lock\u51fd\u6578\u5247\u7528\u65bc\u91cb\u653e\u9396\uff0c\u78ba\u4fdd\u53ea\u6709\u6301\u6709\u9396\u7684\u9032\u7a0b\u624d\u80fd\u91cb\u653e\u5b83\u3002<\/p>\n<h2 id=\"%e9%8e%96%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-jPUXPfyirj\">\u9396\u7684\u512a\u7f3a\u9ede<\/h2>\n<p>\u4f7f\u7528\u9396\u7684\u4e3b\u8981\u512a\u9ede\u662f\u80fd\u5920\u4fdd\u8b49\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\uff0c\u907f\u514d\u7af6\u722d\u689d\u4ef6\u7684\u767c\u751f\u3002\u7136\u800c\uff0c\u9396\u7684\u4f7f\u7528\u4e5f\u5e36\u4f86\u4e86\u4e00\u4e9b\u6f5b\u5728\u7684\u554f\u984c\uff0c\u4f8b\u5982\u6027\u80fd\u74f6\u9838\u548c\u6b7b\u9396\u98a8\u96aa\u3002\u56e0\u6b64\uff0c\u5728\u8a2d\u8a08\u7cfb\u7d71\u6642\uff0c\u9700\u8981\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u4f86\u6c7a\u5b9a\u662f\u5426\u4f7f\u7528\u9396\uff0c\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u9396\u3002<\/p>\n<h3 id=\"%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-jPUXPfyirj\">\u6027\u80fd\u8003\u91cf<\/h3>\n<p>\u5728\u9ad8\u4f75\u767c\u7684\u5834\u666f\u4e0b\uff0c\u9396\u7684\u4f7f\u7528\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u56e0\u70ba\u6bcf\u500b\u8acb\u6c42\u90fd\u9700\u8981\u7b49\u5f85\u9396\u7684\u91cb\u653e\u3002\u9019\u6642\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5176\u4ed6\u6280\u8853\uff0c\u5982\u6d88\u606f\u968a\u5217\u6216\u5206\u4f48\u5f0f\u9396\u4f86\u6e1b\u5c11\u9396\u7684\u7af6\u722d\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-jPUXPfyirj\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0c\u5728Redis\u968a\u5217\u4e2d\u4f7f\u7528\u9396\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u7279\u5225\u662f\u5728\u591a\u9032\u7a0b\u6216\u591a\u7dda\u7a0b\u7684\u74b0\u5883\u4e2d\u3002\u901a\u904e\u9069\u7576\u7684\u9396\u6a5f\u5236\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002\u7136\u800c\uff0c\u958b\u767c\u8005\u5728\u4f7f\u7528\u9396\u6642\u4e5f\u9700\u8981\u8003\u616e\u5230\u6027\u80fd\u548c\u6f5b\u5728\u7684\u98a8\u96aa\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6848\u4f86\u5e73\u8861\u9019\u4e9b\u56e0\u7d20\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u7ba1\u7406\u60a8\u7684\u6578\u64da\u548c\u61c9\u7528\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u8a0eRedis\u968a\u5217\u4e2d\u9396\u7684\u91cd\u8981\u6027\uff0c\u5206\u6790\u5728\u9ad8\u4f75\u767c\u74b0\u5883\u4e0b\u662f\u5426\u9700\u8981\u52a0\u9396\u4ee5\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b89\u5168\u6027\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-188256","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188256","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=188256"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188256\/revisions"}],"predecessor-version":[{"id":188257,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/188256\/revisions\/188257"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=188256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=188256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=188256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}