{"id":202340,"date":"2025-05-10T14:28:48","date_gmt":"2025-05-10T06:28:48","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202340\/"},"modified":"2025-05-10T14:28:48","modified_gmt":"2025-05-10T06:28:48","slug":"redis%e5%8e%9f%e5%ad%90%e6%93%8d%e4%bd%9c%e5%ae%9e%e4%be%8b%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202340\/","title":{"rendered":"redis\u539f\u5b50\u64cd\u4f5c\u5b9e\u4f8b\u5206\u6790"},"content":{"rendered":"

<\/b> <\/p>\n

redis\u539f\u5b50\u64cd\u4f5c\u5b9e\u4f8b\u5206\u6790<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u5404\u4f4d\u5c0f\u4f19\u4f34\u4eec\uff0c\u5927\u5bb6\u597d\u5440\uff01\u770b\u770b\u4eca\u5929\u6211\u53c8\u7ed9\u5404\u4f4d\u5e26\u6765\u4e86\u4ec0\u4e48\u6587\u7ae0\uff1f\u672c\u6587\u6807\u9898\u662f<\/span>\u300aredis\u539f\u5b50\u64cd\u4f5c\u5b9e\u4f8b\u5206\u6790\u300b<\/span>\uff0c\u5f88\u660e\u663e\u662f\u5173\u4e8e\u6570\u636e\u5e93<\/span>\u7684\u6587\u7ae0\u54c8\u54c8\u54c8\uff0c\u5176\u4e2d\u5185\u5bb9\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u80fd\u5e2e\u5230\u4f60\uff0c\u89c9\u5f97\u5f88\u4e0d\u9519\u7684\u8bdd\uff0c\u6b22\u8fce\u5404\u4f4d\u591a\u591a\u70b9\u8bc4\u548c\u5206\u4eab\uff01<\/span><\/p>\n

<\/p>\n

redis\u539f\u5b50\u64cd\u4f5c<\/h3>\n

\u6211\u4eec\u5728\u4f7f\u7528 Redis \u65f6\uff0c\u4e0d\u53ef\u907f\u514d\u5730\u4f1a\u9047\u5230\u5e76\u53d1\u8bbf\u95ee\u7684\u95ee\u9898\uff0c\u6bd4\u5982\u8bf4\u5982\u679c\u591a\u4e2a\u7528\u6237\u540c\u65f6\u4e0b\u5355\uff0c\u5c31\u4f1a\u5bf9\u7f13\u5b58\u5728 Redis \u4e2d\u7684\u5546\u54c1\u5e93\u5b58\u5e76\u53d1\u66f4\u65b0\u3002\u4e00\u65e6\u6709\u4e86\u5e76\u53d1\u5199\u64cd\u4f5c\uff0c\u6570\u636e\u5c31\u4f1a\u88ab\u4fee\u6539\uff0c\u5982\u679c\u6211\u4eec\u6ca1\u6709\u5bf9\u5e76\u53d1\u5199\u8bf7\u6c42\u505a\u597d\u63a7\u5236\uff0c\u5c31\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u88ab\u6539\u9519\uff0c\u5f71\u54cd\u5230\u4e1a\u52a1\u7684\u6b63\u5e38\u4f7f\u7528\uff08\u4f8b\u5982\u5e93\u5b58\u6570\u636e\u9519\u8bef\uff0c\u5bfc\u81f4\u4e0b\u5355\u5f02\u5e38\uff09\u3002<\/p>\n

\u4e3a\u4e86\u4fdd\u8bc1\u5e76\u53d1\u8bbf\u95ee\u7684\u6b63\u786e\u6027\uff0cRedis \u63d0\u4f9b\u4e86\u4e24\u79cd\u65b9\u6cd5\uff0c\u5206\u522b\u662f\u52a0\u9501\u548c\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n

\u52a0\u9501\u662f\u4e00\u79cd\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u5728\u8bfb\u53d6\u6570\u636e\u524d\uff0c\u5ba2\u6237\u7aef\u9700\u8981\u5148\u83b7\u5f97\u9501\uff0c\u5426\u5219\u5c31\u65e0\u6cd5\u8fdb\u884c\u64cd\u4f5c\u3002\u5f53\u4e00\u4e2a\u5ba2\u6237\u7aef\u83b7\u5f97\u9501\u540e\uff0c\u5c31\u4f1a\u4e00\u76f4\u6301\u6709\u8fd9\u628a\u9501\uff0c\u76f4\u5230\u5ba2\u6237\u7aef\u5b8c\u6210\u6570\u636e\u66f4\u65b0\uff0c\u624d\u91ca\u653e\u8fd9\u628a\u9501\u3002
\u770b\u4e0a\u53bb\u597d\u50cf\u662f\u4e00\u79cd\u5f88\u597d\u7684\u65b9\u6848\uff0c\u4f46\u662f\uff0c\u5176\u5b9e\u8fd9\u91cc\u4f1a\u6709\u4e24\u4e2a\u95ee\u9898\uff1a\u4e00\u4e2a\u662f\uff0c\u5982\u679c\u52a0\u9501\u64cd\u4f5c\u591a\uff0c\u4f1a\u964d\u4f4e\u7cfb\u7edf\u7684\u5e76\u53d1\u8bbf\u95ee\u6027\u80fd\uff1b\u7b2c\u4e8c\u4e2a\u662f\uff0cRedis \u5ba2\u6237\u7aef\u8981\u52a0\u9501\u65f6\uff0c\u9700\u8981\u7528\u5230\u5206\u5e03\u5f0f\u9501\uff0c\u800c\u5206\u5e03\u5f0f\u9501\u5b9e\u73b0\u590d\u6742\uff0c\u9700\u8981\u7528\u989d\u5916\u7684\u5b58\u50a8\u7cfb\u7edf\u6765\u63d0\u4f9b\u52a0\u89e3\u9501\u64cd\u4f5c\uff0c\u6211\u4f1a\u5728\u4e0b\u8282\u8bfe\u5411\u4f60\u4ecb\u7ecd\u3002<\/p>\n

\u539f\u5b50\u64cd\u4f5c\u662f\u53e6\u4e00\u79cd\u63d0\u4f9b\u5e76\u53d1\u8bbf\u95ee\u63a7\u5236\u7684\u65b9\u6cd5\u3002\u539f\u5b50\u64cd\u4f5c\u662f\u6307\u6267\u884c\u8fc7\u7a0b\u4fdd\u6301\u539f\u5b50\u6027\u7684\u64cd\u4f5c\uff0c\u800c\u4e14\u539f\u5b50\u64cd\u4f5c\u6267\u884c\u65f6\u5e76\u4e0d\u9700\u8981\u518d\u52a0\u9501\uff0c\u5b9e\u73b0\u4e86\u65e0\u9501\u64cd\u4f5c\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u65e2\u80fd\u4fdd\u8bc1\u5e76\u53d1\u63a7\u5236\uff0c\u8fd8\u80fd\u51cf\u5c11\u5bf9\u7cfb\u7edf\u5e76\u53d1\u6027\u80fd\u7684\u5f71\u54cd\u3002<\/p>\n

\u5e76\u53d1\u8bbf\u95ee\u4e2d\u9700\u8981\u5bf9\u4ec0\u4e48\u8fdb\u884c\u63a7\u5236\uff1f<\/strong>
\u6211\u4eec\u8bf4\u7684\u5e76\u53d1\u8bbf\u95ee\u63a7\u5236\uff0c\u662f\u6307\u5bf9\u591a\u4e2a\u5ba2\u6237\u7aef\u8bbf\u95ee\u64cd\u4f5c\u540c\u4e00\u4efd\u6570\u636e\u7684\u8fc7\u7a0b\u8fdb\u884c\u63a7\u5236\uff0c\u4ee5\u4fdd\u8bc1\u4efb\u4f55\u4e00\u4e2a\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u64cd\u4f5c\u5728 Redis \u5b9e\u4f8b\u4e0a\u6267\u884c\u65f6\u5177\u6709\u4e92\u65a5\u6027\u3002\u4f8b\u5982\uff0c\u5ba2\u6237\u7aef A \u7684\u8bbf\u95ee\u64cd\u4f5c\u5728\u6267\u884c\u65f6\uff0c\u5ba2\u6237\u7aef B \u7684\u64cd\u4f5c\u4e0d\u80fd\u6267\u884c\uff0c\u9700\u8981\u7b49\u5230 A \u7684\u64cd\u4f5c\u7ed3\u675f\u540e\uff0c\u624d\u80fd\u6267\u884c\u3002<\/p>\n

\u5e76\u53d1\u8bbf\u95ee\u63a7\u5236\u5bf9\u5e94\u7684\u64cd\u4f5c\u4e3b\u8981\u662f\u6570\u636e\u4fee\u6539\u64cd\u4f5c\u3002\u5f53\u5ba2\u6237\u7aef\u9700\u8981\u4fee\u6539\u6570\u636e\u65f6\uff0c\u57fa\u672c\u6d41\u7a0b\u5206\u6210\u4e24\u6b65\uff1a<\/p>\n

    \n
  1. \n

    \u5ba2\u6237\u7aef\u5148\u628a\u6570\u636e\u8bfb\u53d6\u5230\u672c\u5730\uff0c\u5728\u672c\u5730\u8fdb\u884c\u4fee\u6539\uff1b<\/p>\n<\/li>\n

  2. \n

    \u5ba2\u6237\u7aef\u4fee\u6539\u5b8c\u6570\u636e\u540e\uff0c\u518d\u5199\u56de Redis\u3002<\/p>\n<\/li>\n<\/ol>\n

    \u6211\u4eec\u628a\u8fd9\u4e2a\u6d41\u7a0b\u53eb\u505a\u201c\u8bfb\u53d6 – \u4fee\u6539 – \u5199\u56de\u201d\u64cd\u4f5c\uff08Read-Modify-Write\uff0c\u7b80\u79f0\u4e3a RMW \u64cd\u4f5c\uff09\u3002\u5f53\u6709\u591a\u4e2a\u5ba2\u6237\u7aef\u5bf9\u540c\u4e00\u4efd\u6570\u636e\u6267\u884c RMW \u64cd\u4f5c\u7684\u8bdd\uff0c\u6211\u4eec\u5c31\u9700\u8981\u8ba9 RMW \u64cd\u4f5c\u6d89\u53ca\u7684\u4ee3\u7801\u4ee5\u539f\u5b50\u6027\u65b9\u5f0f\u6267\u884c\u3002\u8bbf\u95ee\u540c\u4e00\u4efd\u6570\u636e\u7684 RMW \u64cd\u4f5c\u4ee3\u7801\uff0c\u5c31\u53eb\u505a\u4e34\u754c\u533a\u4ee3\u7801\u3002<\/p>\n

    \u4e0d\u8fc7\uff0c\u5f53\u6709\u591a\u4e2a\u5ba2\u6237\u7aef\u5e76\u53d1\u6267\u884c\u4e34\u754c\u533a\u4ee3\u7801\u65f6\uff0c\u5c31\u4f1a\u5b58\u5728\u4e00\u4e9b\u6f5c\u5728\u95ee\u9898\uff0c\u63a5\u4e0b\u6765\uff0c\u6211\u7528\u4e00\u4e2a\u591a\u5ba2\u6237\u7aef\u66f4\u65b0\u5546\u54c1\u5e93\u5b58\u7684\u4f8b\u5b50\u6765\u89e3\u91ca\u4e00\u4e0b\u3002<\/p>\n

    \u6211\u4eec\u5148\u770b\u4e0b\u4e34\u754c\u533a\u4ee3\u7801\u3002\u5047\u8bbe\u5ba2\u6237\u7aef\u8981\u5bf9\u5546\u54c1\u5e93\u5b58\u6267\u884c\u6263\u51cf 1 \u7684\u64cd\u4f5c\uff0c\u4f2a\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

    current = GET(id)\ncurrent--\nSET(id, current)<\/pre>\n
    \u53ef\u4ee5\u770b\u5230\uff0c\u5ba2\u6237\u7aef\u9996\u5148\u4f1a\u6839\u636e\u5546\u54c1 id\uff0c\u4ece Redis \u4e2d\u8bfb\u53d6\u5546\u54c1\u5f53\u524d\u7684\u5e93\u5b58\u503c current\uff08\u5bf9\u5e94 Read)\uff0c\u7136\u540e\uff0c\u5ba2\u6237\u7aef\u5bf9\u5e93\u5b58\u503c\u51cf 1\uff08\u5bf9\u5e94 Modify\uff09\uff0c\u518d\u628a\u5e93\u5b58\u503c\u5199\u56de Redis\uff08\u5bf9\u5e94 Write\uff09\u3002\u5f53\u6709\u591a\u4e2a\u5ba2\u6237\u7aef\u6267\u884c\u8fd9\u6bb5\u4ee3\u7801\u65f6\uff0c\u8fd9\u5c31\u662f\u4e00\u4efd\u4e34\u754c\u533a\u4ee3\u7801\u3002<\/p>\n
    \u5982\u679c\u6211\u4eec\u5bf9\u4e34\u754c\u533a\u4ee3\u7801\u7684\u6267\u884c\u6ca1\u6709\u63a7\u5236\u673a\u5236\uff0c\u5c31\u4f1a\u51fa\u73b0\u6570\u636e\u66f4\u65b0\u9519\u8bef\u3002\u5728\u521a\u624d\u7684\u4f8b\u5b50\u4e2d\uff0c\u5047\u8bbe\u73b0\u5728\u6709\u4e24\u4e2a\u5ba2\u6237\u7aef A \u548c B\uff0c\u540c\u65f6\u6267\u884c\u521a\u624d\u7684\u4e34\u754c\u533a\u4ee3\u7801\uff0c\u5c31\u4f1a\u51fa\u73b0\u9519\u8bef\uff0c\u4f60\u53ef\u4ee5\u770b\u4e0b\u4e0b\u9762\u8fd9\u5f20\u56fe\u3002
    <\/p>\n
    \u53ef\u4ee5\u770b\u5230\uff0c\u5ba2\u6237\u7aef A \u5728 t1 \u65f6\u8bfb\u53d6\u5e93\u5b58\u503c 10 \u5e76\u6263\u51cf 1\uff0c\u5728 t2 \u65f6\uff0c\u5ba2\u6237\u7aef A \u8fd8\u6ca1\u6709\u628a\u6263\u51cf\u540e\u7684\u5e93\u5b58\u503c 9 \u5199\u56de Redis\uff0c\u800c\u5728\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef B \u8bfb\u5230\u5e93\u5b58\u503c 10\uff0c\u4e5f\u6263\u51cf\u4e86 1\uff0cB \u8bb0\u5f55\u7684\u5e93\u5b58\u503c\u4e5f\u4e3a 9 \u4e86\u3002\u7b49\u5230 t3 \u65f6\uff0cA \u5f80 Redis \u5199\u56de\u4e86\u5e93\u5b58\u503c 9\uff0c\u800c\u5230 t4 \u65f6\uff0cB \u4e5f\u5199\u56de\u4e86\u5e93\u5b58\u503c 9\u3002<\/p>\n
    \u5982\u679c\u6309\u6b63\u786e\u7684\u903b\u8f91\u5904\u7406\uff0c\u5ba2\u6237\u7aef A \u548c B \u5bf9\u5e93\u5b58\u503c\u5404\u505a\u4e86\u4e00\u6b21\u6263\u51cf\uff0c\u5e93\u5b58\u503c\u5e94\u8be5\u4e3a 8\u3002\u6240\u4ee5\uff0c\u8fd9\u91cc\u7684\u5e93\u5b58\u503c\u660e\u663e\u66f4\u65b0\u9519\u4e86\u3002<\/p>\n
    \u51fa\u73b0\u8fd9\u4e2a\u73b0\u8c61\u7684\u539f\u56e0\u662f\uff0c\u4e34\u754c\u533a\u4ee3\u7801\u4e2d\u7684\u5ba2\u6237\u7aef\u8bfb\u53d6\u6570\u636e\u3001\u66f4\u65b0\u6570\u636e\u3001\u518d\u5199\u56de\u6570\u636e\u6d89\u53ca\u4e86\u4e09\u4e2a\u64cd\u4f5c\uff0c\u800c\u8fd9\u4e09\u4e2a\u64cd\u4f5c\u5728\u6267\u884c\u65f6\u5e76\u4e0d\u5177\u6709\u4e92\u65a5\u6027\uff0c\u591a\u4e2a\u5ba2\u6237\u7aef\u57fa\u4e8e\u76f8\u540c\u7684\u521d\u59cb\u503c\u8fdb\u884c\u4fee\u6539\uff0c\u800c\u4e0d\u662f\u57fa\u4e8e\u524d\u4e00\u4e2a\u5ba2\u6237\u7aef\u4fee\u6539\u540e\u7684\u503c\u518d\u4fee\u6539\u3002<\/p>\n
    \u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5e76\u53d1\u4fee\u6539\u7684\u6b63\u786e\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u9501\u628a\u5e76\u884c\u64cd\u4f5c\u53d8\u6210\u4e32\u884c\u64cd\u4f5c\uff0c\u4e32\u884c\u64cd\u4f5c\u5c31\u5177\u6709\u4e92\u65a5\u6027\u3002\u4e00\u4e2a\u5ba2\u6237\u7aef\u6301\u6709\u9501\u540e\uff0c\u5176\u4ed6\u5ba2\u6237\u7aef\u53ea\u80fd\u7b49\u5230\u9501\u91ca\u653e\uff0c\u624d\u80fd\u62ff\u9501\u518d\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n
    \u4e0b\u9762\u7684\u4f2a\u4ee3\u7801\u663e\u793a\u4e86\u4f7f\u7528\u9501\u6765\u63a7\u5236\u4e34\u754c\u533a\u4ee3\u7801\u7684\u6267\u884c\u60c5\u51b5\uff0c\u4f60\u53ef\u4ee5\u770b\u4e0b\u3002<\/p>\n
    LOCK()\ncurrent = GET(id)\ncurrent--\nSET(id, current)\nUNLOCK()<\/pre>\n
    \u867d\u7136\u52a0\u9501\u4fdd\u8bc1\u4e86\u4e92\u65a5\u6027\uff0c\u4f46\u662f\u52a0\u9501\u4e5f\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5e76\u53d1\u6027\u80fd\u964d\u4f4e\u3002<\/strong><\/p>\n
    \u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5f53\u5ba2\u6237\u7aef A \u52a0\u9501\u6267\u884c\u64cd\u4f5c\u65f6\uff0c\u5ba2\u6237\u7aef B\u3001C \u5c31\u9700\u8981\u7b49\u5f85\u3002A \u91ca\u653e\u9501\u540e\uff0c\u5047\u8bbe B \u62ff\u5230\u9501\uff0c\u90a3\u4e48 C \u8fd8\u9700\u8981\u7ee7\u7eed\u7b49\u5f85\uff0c\u6240\u4ee5\uff0ct1 \u65f6\u6bb5\u5185\u53ea\u6709 A \u80fd\u8bbf\u95ee\u5171\u4eab\u6570\u636e\uff0ct2 \u65f6\u6bb5\u5185\u53ea\u6709 B \u80fd\u8bbf\u95ee\u5171\u4eab\u6570\u636e\uff0c\u7cfb\u7edf\u7684\u5e76\u53d1\u6027\u80fd\u5f53\u7136\u5c31\u4e0b\u964d\u4e86\u3002
    <\/p>\n
    \u548c\u52a0\u9501\u7c7b\u4f3c\uff0c\u539f\u5b50\u64cd\u4f5c\u4e5f\u80fd\u5b9e\u73b0\u5e76\u53d1\u63a7\u5236\uff0c\u4f46\u662f\u539f\u5b50\u64cd\u4f5c\u5bf9\u7cfb\u7edf\u5e76\u53d1\u6027\u80fd\u7684\u5f71\u54cd\u8f83\u5c0f\uff0c\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c31\u6765\u4e86\u89e3\u4e0b Redis \u4e2d\u7684\u539f\u5b50\u64cd\u4f5c\u3002<\/p>\n
    Redis \u7684\u4e24\u79cd\u539f\u5b50\u64cd\u4f5c\u65b9\u6cd5<\/strong><\/p>\n
    \u4e3a\u4e86\u5b9e\u73b0\u5e76\u53d1\u63a7\u5236\u8981\u6c42\u7684\u4e34\u754c\u533a\u4ee3\u7801\u4e92\u65a5\u6267\u884c\uff0cRedis \u7684\u539f\u5b50\u64cd\u4f5c\u91c7\u7528\u4e86\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n
      \n
    1. \n
      \u628a\u591a\u4e2a\u64cd\u4f5c\u5728 Redis \u4e2d\u5b9e\u73b0\u6210\u4e00\u4e2a\u64cd\u4f5c\uff0c\u4e5f\u5c31\u662f\u5355\u547d\u4ee4\u64cd\u4f5c\uff1b<\/p>\n<\/li>\n
    2. \n
      \u628a\u591a\u4e2a\u64cd\u4f5c\u5199\u5230\u4e00\u4e2a Lua \u811a\u672c\u4e2d\uff0c\u4ee5\u539f\u5b50\u6027\u65b9\u5f0f\u6267\u884c\u5355\u4e2a Lua \u811a\u672c\u3002<\/p>\n<\/li>\n<\/ol>\n
      \u6211\u4eec\u5148\u6765\u770b\u4e0b Redis \u672c\u8eab\u7684\u5355\u547d\u4ee4\u64cd\u4f5c\u3002<\/p>\n
      Redis \u662f\u4f7f\u7528\u5355\u7ebf\u7a0b\u6765\u4e32\u884c\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u64cd\u4f5c\u547d\u4ee4\u7684\uff0c\u6240\u4ee5\uff0c\u5f53 Redis \u6267\u884c\u67d0\u4e2a\u547d\u4ee4\u64cd\u4f5c\u65f6\uff0c\u5176\u4ed6\u547d\u4ee4\u662f\u65e0\u6cd5\u6267\u884c\u7684\uff0c\u8fd9\u76f8\u5f53\u4e8e\u547d\u4ee4\u64cd\u4f5c\u662f\u4e92\u65a5\u6267\u884c\u7684\u3002\u5f53\u7136\uff0cRedis \u7684\u5feb\u7167\u751f\u6210\u3001AOF \u91cd\u5199\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u53ef\u4ee5\u4f7f\u7528\u540e\u53f0\u7ebf\u7a0b\u6216\u8005\u662f\u5b50\u8fdb\u7a0b\u6267\u884c\uff0c\u4e5f\u5c31\u662f\u548c\u4e3b\u7ebf\u7a0b\u7684\u64cd\u4f5c\u5e76\u884c\u6267\u884c\u3002\u4e0d\u8fc7\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u53ea\u662f\u8bfb\u53d6\u6570\u636e\uff0c\u4e0d\u4f1a\u4fee\u6539\u6570\u636e\uff0c\u6240\u4ee5\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u5bf9\u5b83\u4eec\u505a\u5e76\u53d1\u63a7\u5236\u3002<\/p>\n
      \u4f60\u53ef\u80fd\u4e5f\u6ce8\u610f\u5230\u4e86\uff0c\u867d\u7136 Redis \u7684\u5355\u4e2a\u547d\u4ee4\u64cd\u4f5c\u53ef\u4ee5\u539f\u5b50\u6027\u5730\u6267\u884c\uff0c\u4f46\u662f\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6570\u636e\u4fee\u6539\u65f6\u53ef\u80fd\u5305\u542b\u591a\u4e2a\u64cd\u4f5c\uff0c\u81f3\u5c11\u5305\u62ec\u8bfb\u6570\u636e\u3001\u6570\u636e\u589e\u51cf\u3001\u5199\u56de\u6570\u636e\u4e09\u4e2a\u64cd\u4f5c\uff0c\u8fd9\u663e\u7136\u5c31\u4e0d\u662f\u5355\u4e2a\u547d\u4ee4\u64cd\u4f5c\u4e86\uff0c\u90a3\u8be5\u600e\u4e48\u529e\u5462\uff1f<\/p>\n
      \u522b\u62c5\u5fc3\uff0cRedis \u63d0\u4f9b\u4e86 INCR\/DECR \u547d\u4ee4\uff0c\u628a\u8fd9\u4e09\u4e2a\u64cd\u4f5c\u8f6c\u53d8\u4e3a\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c\u4e86\u3002INCR\/DECR \u547d\u4ee4\u53ef\u4ee5\u5bf9\u6570\u636e\u8fdb\u884c\u589e\u503c \/ \u51cf\u503c\u64cd\u4f5c\uff0c\u800c\u4e14\u5b83\u4eec\u672c\u8eab\u5c31\u662f\u5355\u4e2a\u547d\u4ee4\u64cd\u4f5c\uff0cRedis \u5728\u6267\u884c\u5b83\u4eec\u65f6\uff0c\u672c\u8eab\u5c31\u5177\u6709\u4e92\u65a5\u6027\u3002<\/p>\n
      \u6bd4\u5982\u8bf4\uff0c\u5728\u521a\u624d\u7684\u5e93\u5b58\u6263\u51cf\u4f8b\u5b50\u4e2d\uff0c\u5ba2\u6237\u7aef\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u76f4\u63a5\u5b8c\u6210\u5bf9\u5546\u54c1 id \u7684\u5e93\u5b58\u503c\u51cf 1 \u64cd\u4f5c\u3002\u5373\u4f7f\u6709\u591a\u4e2a\u5ba2\u6237\u7aef\u6267\u884c\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u4e5f\u4e0d\u7528\u62c5\u5fc3\u51fa\u73b0\u5e93\u5b58\u503c\u6263\u51cf\u9519\u8bef\u7684\u95ee\u9898\u3002<\/p>\n
      DECR id<\/pre>\n
      \u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u6267\u884c\u7684 RMW \u64cd\u4f5c\u662f\u5bf9\u6570\u636e\u8fdb\u884c\u589e\u51cf\u503c\u7684\u8bdd\uff0cRedis \u63d0\u4f9b\u7684\u539f\u5b50\u64cd\u4f5c INCR \u548c DECR \u53ef\u4ee5\u76f4\u63a5\u5e2e\u52a9\u6211\u4eec\u8fdb\u884c\u5e76\u53d1\u63a7\u5236\u3002<\/p>\n
      \u4f46\u662f\uff0c\u5982\u679c\u6211\u4eec\u8981\u6267\u884c\u7684\u64cd\u4f5c\u4e0d\u662f\u7b80\u5355\u5730\u589e\u51cf\u6570\u636e\uff0c\u800c\u662f\u6709\u66f4\u52a0\u590d\u6742\u7684\u5224\u65ad\u903b\u8f91\u6216\u8005\u662f\u5176\u4ed6\u64cd\u4f5c\uff0c\u90a3\u4e48\uff0cRedis \u7684\u5355\u547d\u4ee4\u64cd\u4f5c\u5df2\u7ecf\u65e0\u6cd5\u4fdd\u8bc1\u591a\u4e2a\u64cd\u4f5c\u7684\u4e92\u65a5\u6267\u884c\u4e86\u3002\u6240\u4ee5\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u7b2c\u4e8c\u4e2a\u65b9\u6cd5\uff0c\u4e5f\u5c31\u662f Lua \u811a\u672c\u3002<\/p>\n
      Redis \u4f1a\u628a\u6574\u4e2a Lua \u811a\u672c\u4f5c\u4e3a\u4e00\u4e2a\u6574\u4f53\u6267\u884c\uff0c\u5728\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u88ab\u5176\u4ed6\u547d\u4ee4\u6253\u65ad\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86 Lua \u811a\u672c\u4e2d\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u5982\u679c\u6211\u4eec\u6709\u591a\u4e2a\u64cd\u4f5c\u8981\u6267\u884c\uff0c\u4f46\u662f\u53c8\u65e0\u6cd5\u7528 INCR\/DECR \u8fd9\u79cd\u547d\u4ee4\u64cd\u4f5c\u6765\u5b9e\u73b0\uff0c\u5c31\u53ef\u4ee5\u628a\u8fd9\u4e9b\u8981\u6267\u884c\u7684\u64cd\u4f5c\u7f16\u5199\u5230\u4e00\u4e2a Lua \u811a\u672c\u4e2d\u3002
       \u7136\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 Redis \u7684 EVAL \u547d\u4ee4\u6765\u6267\u884c\u811a\u672c\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u5728\u6267\u884c\u65f6\u5c31\u5177\u6709\u4e86\u4e92\u65a5\u6027\u3002<\/p>\n
      \u518d\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5177\u4f53\u89e3\u91ca\u4e0b Lua \u7684\u4f7f\u7528\u3002
       \u5f53\u4e00\u4e2a\u4e1a\u52a1\u5e94\u7528\u7684\u8bbf\u95ee\u7528\u6237\u589e\u52a0\u65f6\uff0c\u6211\u4eec\u6709\u65f6\u9700\u8981\u9650\u5236\u67d0\u4e2a\u5ba2\u6237\u7aef\u5728\u4e00\u5b9a\u65f6\u95f4\u8303\u56f4\u5185\u7684\u8bbf\u95ee\u6b21\u6570\uff0c\u6bd4\u5982\u7206\u6b3e\u5546\u54c1\u7684\u8d2d\u4e70\u9650\u6d41\u3001\u793e\u4ea4\u7f51\u7edc\u4e2d\u7684\u6bcf\u5206\u949f\u70b9\u8d5e\u6b21\u6570\u9650\u5236\u7b49\u3002<\/p>\n
      \u90a3\u8be5\u600e\u4e48\u9650\u5236\u5462\uff1f\u6211\u4eec\u53ef\u4ee5\u628a\u5ba2\u6237\u7aef IP \u4f5c\u4e3a key\uff0c\u628a\u5ba2\u6237\u7aef\u7684\u8bbf\u95ee\u6b21\u6570\u4f5c\u4e3a value\uff0c\u4fdd\u5b58\u5230 Redis \u4e2d\u3002\u5ba2\u6237\u7aef\u6bcf\u8bbf\u95ee\u4e00\u6b21\u540e\uff0c\u6211\u4eec\u5c31\u7528 INCR \u589e\u52a0\u8bbf\u95ee\u6b21\u6570\u3002<\/p>\n
      \u4e0d\u8fc7\uff0c\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\uff0c\u5ba2\u6237\u7aef\u9650\u6d41\u5176\u5b9e\u540c\u65f6\u5305\u542b\u4e86\u5bf9\u8bbf\u95ee\u6b21\u6570\u548c\u65f6\u95f4\u8303\u56f4\u7684\u9650\u5236\uff0c\u4f8b\u5982\u6bcf\u5206\u949f\u7684\u8bbf\u95ee\u6b21\u6570\u4e0d\u80fd\u8d85\u8fc7 20\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5ba2\u6237\u7aef\u7b2c\u4e00\u6b21\u8bbf\u95ee\u65f6\uff0c\u7ed9\u5bf9\u5e94\u952e\u503c\u5bf9\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u4f8b\u5982\u8bbe\u7f6e\u4e3a 60s \u540e\u8fc7\u671f\u3002\u540c\u65f6\uff0c\u5728\u5ba2\u6237\u7aef\u6bcf\u6b21\u8bbf\u95ee\u65f6\uff0c\u6211\u4eec\u8bfb\u53d6\u5ba2\u6237\u7aef\u5f53\u524d\u7684\u8bbf\u95ee\u6b21\u6570\uff0c\u5982\u679c\u6b21\u6570\u8d85\u8fc7\u9608\u503c\uff0c\u5c31\u62a5\u9519\uff0c\u9650\u5236\u5ba2\u6237\u7aef\u518d\u6b21\u8bbf\u95ee\u3002\u4f60\u53ef\u4ee5\u770b\u4e0b\u4e0b\u9762\u7684\u8fd9\u6bb5\u4ee3\u7801\uff0c\u5b83\u5b9e\u73b0\u4e86\u5bf9\u5ba2\u6237\u7aef\u6bcf\u5206\u949f\u8bbf\u95ee\u6b21\u6570\u4e0d\u8d85\u8fc7 20 \u6b21\u7684\u9650\u5236\u3002<\/p>\n
      \/\/\u83b7\u53d6ip\u5bf9\u5e94\u7684\u8bbf\u95ee\u6b21\u6570\ncurrent = GET(ip)\n\/\/\u5982\u679c\u8d85\u8fc7\u8bbf\u95ee\u6b21\u6570\u8d85\u8fc720\u6b21\uff0c\u5219\u62a5\u9519\nIF current != NULL AND current > 20 THEN\n    ERROR \"exceed 20 accesses per second\"\nELSE\n    \/\/\u5982\u679c\u8bbf\u95ee\u6b21\u6570\u4e0d\u8db320\u6b21\uff0c\u589e\u52a0\u4e00\u6b21\u8bbf\u95ee\u8ba1\u6570\n    value = INCR(ip)\n    \/\/\u5982\u679c\u662f\u7b2c\u4e00\u6b21\u8bbf\u95ee\uff0c\u5c06\u952e\u503c\u5bf9\u7684\u8fc7\u671f\u65f6\u95f4\u8bbe\u7f6e\u4e3a60s\u540e\n    IF value == 1 THEN\n        EXPIRE(ip,60)\n    END\n    \/\/\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\n    DO THINGS\nEND<\/pre>\n
      \u53ef\u4ee5\u770b\u5230\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5df2\u7ecf\u4f7f\u7528\u4e86 INCR \u6765\u539f\u5b50\u6027\u5730\u589e\u52a0\u8ba1\u6570\u3002\u4f46\u662f\uff0c\u5ba2\u6237\u7aef\u9650\u6d41\u7684\u903b\u8f91\u4e0d\u53ea\u6709\u8ba1\u6570\uff0c\u8fd8\u5305\u62ec\u8bbf\u95ee\u6b21\u6570\u5224\u65ad\u548c\u8fc7\u671f\u65f6\u95f4\u8bbe\u7f6e\u3002<\/strong><\/p>\n
      \u5bf9\u4e8e\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u6211\u4eec\u540c\u6837\u9700\u8981\u4fdd\u8bc1\u5b83\u4eec\u7684\u539f\u5b50\u6027\u3002\u5426\u5219\uff0c\u5982\u679c\u5ba2\u6237\u7aef\u4f7f\u7528\u591a\u7ebf\u7a0b\u8bbf\u95ee\uff0c\u8bbf\u95ee\u6b21\u6570\u521d\u59cb\u503c\u4e3a 0\uff0c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u4e86 INCR(ip) \u64cd\u4f5c\u540e\uff0c\u7b2c\u4e8c\u4e2a\u7ebf\u7a0b\u7d27\u63a5\u7740\u4e5f\u6267\u884c\u4e86 INCR(ip)\uff0c\u6b64\u65f6\uff0cip \u5bf9\u5e94\u7684\u8bbf\u95ee\u6b21\u6570\u5c31\u88ab\u589e\u52a0\u5230\u4e86 2\uff0c\u6211\u4eec\u5c31\u65e0\u6cd5\u518d\u5bf9\u8fd9\u4e2a ip \u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u4e86\u3002\u8fd9\u6837\u5c31\u4f1a\u5bfc\u81f4\uff0c\u8fd9\u4e2a ip \u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u8bbf\u95ee\u6b21\u6570\u8fbe\u5230 20 \u6b21\u4e4b\u540e\uff0c\u5c31\u65e0\u6cd5\u518d\u8fdb\u884c\u8bbf\u95ee\u4e86\u3002\u5373\u4f7f\u8fc7\u4e86 60s\uff0c\u4e5f\u4e0d\u80fd\u518d\u7ee7\u7eed\u8bbf\u95ee\uff0c\u663e\u7136\u4e0d\u7b26\u5408\u4e1a\u52a1\u8981\u6c42\u3002<\/p>\n
      \u6240\u4ee5\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u7684\u64cd\u4f5c\u65e0\u6cd5\u7528 Redis \u5355\u4e2a\u547d\u4ee4\u6765\u5b9e\u73b0\uff0c\u6b64\u65f6\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528 Lua \u811a\u672c\u6765\u4fdd\u8bc1\u5e76\u53d1\u63a7\u5236\u3002\u6211\u4eec\u53ef\u4ee5\u628a\u8bbf\u95ee\u6b21\u6570\u52a0 1\u3001\u5224\u65ad\u8bbf\u95ee\u6b21\u6570\u662f\u5426\u4e3a 1\uff0c\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u8fd9\u4e09\u4e2a\u64cd\u4f5c\u5199\u5165\u4e00\u4e2a Lua \u811a\u672c\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
      local current\ncurrent = redis.call(\"incr\",KEYS[1])\nif tonumber(current) == 1 then\n    redis.call(\"expire\",KEYS[1],60)\nend<\/pre>\n
      \u5047\u8bbe\u6211\u4eec\u7f16\u5199\u7684\u811a\u672c\u540d\u79f0\u4e3a lua.script\uff0c\u6211\u4eec\u63a5\u7740\u5c31\u53ef\u4ee5\u4f7f\u7528 Redis \u5ba2\u6237\u7aef\uff0c\u5e26\u4e0a eval \u9009\u9879\uff0c\u6765\u6267\u884c\u8be5\u811a\u672c\u3002\u811a\u672c\u6240\u9700\u7684\u53c2\u6570\u5c06\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u4e2d\u7684 keys \u548c args \u8fdb\u884c\u4f20\u9012\u3002<\/p>\n
      redis-cli  --eval lua.script  keys , args<\/pre>\n
      \u8fd9\u6837\u4e00\u6765\uff0c\u8bbf\u95ee\u6b21\u6570\u52a0 1\u3001\u5224\u65ad\u8bbf\u95ee\u6b21\u6570\u662f\u5426\u4e3a 1\uff0c\u4ee5\u53ca\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u8fd9\u4e09\u4e2a\u64cd\u4f5c\u5c31\u53ef\u4ee5\u539f\u5b50\u6027\u5730\u6267\u884c\u4e86\u3002\u5373\u4f7f\u5ba2\u6237\u7aef\u6709\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u8fd9\u4e2a\u811a\u672c\uff0cRedis \u4e5f\u4f1a\u4f9d\u6b21\u4e32\u884c\u6267\u884c\u811a\u672c\u4ee3\u7801\uff0c\u907f\u514d\u4e86\u5e76\u53d1\u64cd\u4f5c\u5e26\u6765\u7684\u6570\u636e\u9519\u8bef\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
      redis\u539f\u5b50\u64cd\u4f5c\u5b9e\u4f8b\u5206\u6790 \u6536\u85cf...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-202340","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202340","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202340"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202340\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202340"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}