{"id":124645,"date":"2024-10-25T15:57:22","date_gmt":"2024-10-25T07:57:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/124645\/"},"modified":"2024-10-25T15:57:23","modified_gmt":"2024-10-25T07:57:23","slug":"redis-%e9%9b%86%e7%be%a4%e4%b8%ad%e7%9a%84-setnx-%e5%af%a6%e7%8f%be%e9%98%b2%e6%ad%a2%e4%ba%92%e6%96%a5%e8%a1%9d%e7%aa%81","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/124645\/","title":{"rendered":"Redis \u96c6\u7fa4\u4e2d\u7684 SetNX \u5be6\u73fe\u9632\u6b62\u4e92\u65a5\u885d\u7a81"},"content":{"rendered":"<h1 id=\"redis-%e9%9b%86%e7%be%a4%e4%b8%ad%e7%9a%84-setnx-%e5%af%a6%e7%8f%be%e9%98%b2%e6%ad%a2%e4%ba%92%e6%96%a5%e8%a1%9d%e7%aa%81-HyQDcWBBKY\">Redis \u96c6\u7fa4\u4e2d\u7684 SetNX \u5be6\u73fe\u9632\u6b62\u4e92\u65a5\u885d\u7a81<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u4e00\u81f4\u6027\u548c\u4e92\u65a5\u63a7\u5236\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Redis \u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u6a5f\u5236\u4f86\u5be6\u73fe\u9019\u4e9b\u9700\u6c42\u3002\u5176\u4e2d\uff0cSetNX\uff08Set if Not eXists\uff09\u547d\u4ee4\u5728\u9632\u6b62\u4e92\u65a5\u885d\u7a81\u65b9\u9762\u626e\u6f14\u4e86\u91cd\u8981\u89d2\u8272\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Redis \u96c6\u7fa4\u4e2d SetNX \u7684\u5be6\u73fe\u53ca\u5176\u5728\u9632\u6b62\u4e92\u65a5\u885d\u7a81\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-setnx%ef%bc%9f-HyQDcWBBKY\">\u4ec0\u9ebc\u662f SetNX\uff1f<\/h2>\n<p>SetNX \u662f Redis \u4e2d\u7684\u4e00\u500b\u547d\u4ee4\uff0c\u7528\u65bc\u8a2d\u7f6e\u9375\u7684\u503c\uff0c\u50c5\u7576\u8a72\u9375\u4e0d\u5b58\u5728\u6642\u3002\u9019\u610f\u5473\u8457\u5982\u679c\u9375\u5df2\u7d93\u5b58\u5728\uff0cSetNX \u4e0d\u6703\u5c0d\u5176\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\u3002\u9019\u4e00\u7279\u6027\u4f7f\u5f97 SetNX \u6210\u70ba\u5be6\u73fe\u4e92\u65a5\u9396\u7684\u7406\u60f3\u9078\u64c7\u3002<\/p>\n<pre><code>SETNX key value\n<\/code><\/pre>\n<p>\u7576\u57f7\u884c\u4e0a\u8ff0\u547d\u4ee4\u6642\uff0c\u5982\u679c\u9375 &#8220;key&#8221; \u4e0d\u5b58\u5728\uff0c\u5247\u6703\u5c07\u5176\u8a2d\u7f6e\u70ba &#8220;value&#8221;\uff0c\u4e26\u8fd4\u56de 1\uff1b\u5982\u679c\u9375\u5df2\u5b58\u5728\uff0c\u5247\u4e0d\u6703\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\uff0c\u4e26\u8fd4\u56de 0\u3002<\/p>\n<h2 id=\"setnx-%e5%9c%a8%e9%98%b2%e6%ad%a2%e4%ba%92%e6%96%a5%e8%a1%9d%e7%aa%81%e4%b8%ad%e7%9a%84%e6%87%89%e7%94%a8-HyQDcWBBKY\">SetNX \u5728\u9632\u6b62\u4e92\u65a5\u885d\u7a81\u4e2d\u7684\u61c9\u7528<\/h2>\n<p>\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u7576\u591a\u500b\u5be6\u4f8b\u540c\u6642\u5617\u8a66\u8a2a\u554f\u5171\u4eab\u8cc7\u6e90\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u6216\u885d\u7a81\u3002\u4f7f\u7528 SetNX \u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u9019\u7a2e\u60c5\u6cc1\u7684\u767c\u751f\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528 SetNX \u5be6\u73fe\u4e92\u65a5\u9396\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u5617\u8a66\u4f7f\u7528 SetNX \u547d\u4ee4\u8a2d\u7f6e\u4e00\u500b\u9396\u9375\u3002<\/li>\n<li>\u5982\u679c\u8fd4\u56de\u503c\u70ba 1\uff0c\u5247\u8868\u793a\u6210\u529f\u7372\u5f97\u9396\uff0c\u53ef\u4ee5\u5b89\u5168\u5730\u8a2a\u554f\u5171\u4eab\u8cc7\u6e90\u3002<\/li>\n<li>\u5728\u5b8c\u6210\u64cd\u4f5c\u5f8c\uff0c\u522a\u9664\u9396\u9375\u4ee5\u91cb\u653e\u9396\u3002<\/li>\n<li>\u5982\u679c\u8fd4\u56de\u503c\u70ba 0\uff0c\u5247\u8868\u793a\u9396\u5df2\u88ab\u5176\u4ed6\u5be6\u4f8b\u7372\u5f97\uff0c\u9700\u7b49\u5f85\u6216\u91cd\u8a66\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-HyQDcWBBKY\">\u793a\u4f8b\u4ee3\u78bc<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SetNX \u5be6\u73fe\u4e92\u65a5\u9396\u7684\u7c21\u55ae\u793a\u4f8b\uff1a<\/p>\n<pre><code>import redis\nimport time\n\n# \u9023\u63a5\u5230 Redis\nr = redis.Redis(host='localhost', port=6379, db=0)\n\ndef acquire_lock(lock_name, acquire_time=10):\n    identifier = str(uuid.uuid4())\n    end = time.time() + acquire_time\n    while time.time() &lt; end:\n        if r.set(lock_name, identifier, nx=True, ex=acquire_time):\n            return identifier\n        time.sleep(0.01)\n    return False\n\ndef release_lock(lock_name, identifier):\n    pipe = r.pipeline(True)\n    while True:\n        try:\n            pipe.watch(lock_name)\n            if pipe.get(lock_name) == identifier:\n                pipe.multi()\n                pipe.delete(lock_name)\n                pipe.execute()\n                return True\n            pipe.unwatch()\n            break\n        except redis.WatchError:\n            pass\n    return False\n\n# \u4f7f\u7528\u793a\u4f8b\nlock_id = acquire_lock(&quot;my_lock&quot;)\nif lock_id:\n    try:\n        # \u57f7\u884c\u9700\u8981\u4e92\u65a5\u7684\u64cd\u4f5c\n        pass\n    finally:\n        release_lock(&quot;my_lock&quot;, lock_id)\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-HyQDcWBBKY\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528 SetNX \u5be6\u73fe\u4e92\u65a5\u9396\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u9396\u7684\u904e\u671f\u6642\u9593\uff1a<\/strong>\u70ba\u4e86\u9632\u6b62\u6b7b\u9396\uff0c\u61c9\u8a72\u70ba\u9396\u8a2d\u7f6e\u4e00\u500b\u904e\u671f\u6642\u9593\u3002<\/li>\n<li><strong>\u552f\u4e00\u6a19\u8b58\u7b26\uff1a<\/strong>\u4f7f\u7528\u552f\u4e00\u6a19\u8b58\u7b26\u4f86\u78ba\u4fdd\u53ea\u6709\u7372\u5f97\u9396\u7684\u5be6\u4f8b\u53ef\u4ee5\u91cb\u653e\u9396\u3002<\/li>\n<li><strong>\u91cd\u8a66\u6a5f\u5236\uff1a<\/strong>\u5728\u7372\u53d6\u9396\u5931\u6557\u6642\uff0c\u61c9\u8a72\u5be6\u73fe\u91cd\u8a66\u6a5f\u5236\uff0c\u4ee5\u63d0\u9ad8\u6210\u529f\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HyQDcWBBKY\">\u7e3d\u7d50<\/h2>\n<p>SetNX \u547d\u4ee4\u5728 Redis \u96c6\u7fa4\u4e2d\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\u4f86\u5be6\u73fe\u4e92\u65a5\u9396\uff0c\u5f9e\u800c\u9632\u6b62\u4e92\u65a5\u885d\u7a81\u3002\u901a\u904e\u5408\u7406\u5730\u4f7f\u7528 SetNX\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u78ba\u4fdd\u5728\u5206\u4f48\u5f0f\u74b0\u5883\u4e2d\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b89\u5168\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u9ad8\u6027\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 Redis \u96c6\u7fa4\u4e2d SetNX \u7684\u61c9\u7528\uff0c\u5982\u4f55\u6709\u6548\u9632\u6b62\u4e92\u65a5\u885d\u7a81\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u8207\u9ad8\u6548\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-124645","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124645","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=124645"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124645\/revisions"}],"predecessor-version":[{"id":124646,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/124645\/revisions\/124646"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=124645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=124645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=124645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}