{"id":208214,"date":"2025-07-08T16:04:30","date_gmt":"2025-07-08T08:04:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/208214\/"},"modified":"2025-07-08T16:04:30","modified_gmt":"2025-07-08T08:04:30","slug":"%e5%a4%84%e7%90%86%e7%bd%91%e7%bb%9c%e6%95%b0%e6%8d%ae%e5%8c%85%e8%af%bb%e5%8f%96%e8%b6%85%e6%97%b6%e5%90%8e%e7%9a%84%e9%94%99%e8%af%af","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208214\/","title":{"rendered":"\u5904\u7406\u7f51\u7edc\u6570\u636e\u5305\u8bfb\u53d6\u8d85\u65f6\u540e\u7684\u9519\u8bef"},"content":{"rendered":"

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

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u5904\u7406\u7f51\u7edc\u6570\u636e\u5305\u8bfb\u53d6\u8d85\u65f6\u540e\u7684\u9519\u8bef<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-30 13:39:39<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u201c\u7eb5\u6709\u75be\u98ce\u6765\uff0c\u4eba\u751f\u4e0d\u8a00\u5f03\u201d\uff0c\u8fd9\u53e5\u8bdd\u9001\u7ed9\u6b63\u5728\u5b66\u4e60Golang<\/span>\u7684\u670b\u53cb\u4eec\uff0c\u4e5f\u5e0c\u671b\u5728\u9605\u8bfb\u672c\u6587\u300a\u5904\u7406\u7f51\u7edc\u6570\u636e\u5305\u8bfb\u53d6\u8d85\u65f6\u540e\u7684\u9519\u8bef\u300b<\/span>\u540e\uff0c\u80fd\u591f\u771f\u7684\u5e2e\u52a9\u5230\u5927\u5bb6\u3002\u6211\u4e5f\u4f1a\u5728\u540e\u7eed\u7684\u6587\u7ae0\u4e2d\uff0c\u9646\u7eed\u66f4\u65b0Golang<\/span>\u76f8\u5173\u7684\u6280\u672f\u6587\u7ae0\uff0c\u6709\u597d\u7684\u5efa\u8bae\u6b22\u8fce\u5927\u5bb6\u5728\u8bc4\u8bba\u7559\u8a00\uff0c\u975e\u5e38\u611f\u8c22\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6b63\u5728\u4f7f\u7528conn.setreaddeadline<\/code>\u65b9\u6cd5\u6765\u8bbe\u7f6econn<\/code>\u7684\u8bfb\u53d6\u8d85\u65f6\uff0c\u5f53conn.read<\/code>\u7b49\u5f85\u8d85\u8fc7\u6307\u5b9a\u65f6\u95f4\u65f6\uff0c\u5c31\u4f1a\u8fd4\u56de\u5e76\u8fd4\u56de*net.operror<\/code>\u7c7b\u578b\u7684\u9519\u8bef\u3002\u6b64\u9519\u8bef\u662f net<\/code> \u5305\u5728\u5305\u88c5\u6240\u6709\u975e io.eof<\/code> \u9519\u8bef\u540e\u8fd4\u56de\u7684\u3002<\/p>\n

\u6211\u53ef\u4ee5\u5728\u4f7f\u7528 unwrap()<\/code> \u5305\u88c5\u4e4b\u524d\u5f97\u5230\u9519\u8bef\u3002\u8d85\u65f6\u9519\u8bef\u662f *poll.deadlineexceedederror<\/code> \u7c7b\u578b\u7684\u9519\u8bef\u3002\u6211\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528\u8fd9\u6837\u7684\u8bed\u53e5\u6765\u7cbe\u786e\u5904\u7406\u8d85\u65f6\u9519\u8bef\u3002<\/p>\n

import \"internal\/poll\"\n\n_, err = conn.Read(p)\n\n    if err != nil {\n        if pe, ok := err.(*net.OpError); ok {\n            err = pe.Unwrap()\n            if timeout, ok := err.(*poll.DeadlineExceededError); ok {\n                log.Error(fmt.Sprintf(\"%T, %s\", timeout, timeout))\n            }\n        }\n        return\n    }\n<\/pre>\n
\u8fd0\u884c\u7a0b\u5e8f\u65f6\uff0c\u6211\u6536\u5230\u4e86 use of inside package inside\/poll not allowed<\/code> \u9519\u8bef\u3002\u7f16\u8bd1\u5668\u544a\u8bc9\u6211\u4e0d\u80fd\u4f7f\u7528\u5185\u90e8\u5305\u3002<\/p>\n
\u6211\u7528google\u641c\u7d22\u627e\u5230\u4e86\u5220\u9664internal<\/code>\u6587\u4ef6\u5939\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u8fd9\u662f\u6700\u7ec8\u7684\u89e3\u51b3\u65b9\u6848\u5417\uff1f\u6709\u66f4\u597d\u7684\u89e3\u51b3\u65b9\u6848\u5417\uff1f<\/p>\n
 <\/p>\n
\u6b63\u786e\u7b54\u6848<\/h2>\n
 <\/p>\n
os<\/code> \u5305\u5c06\u8be5\u9519\u8bef\u5bfc\u51fa\u4e3a \uff08\u68c0\u67e5 \uff09\u3002\u60a8\u53ef\u4ee5\u5c1d\u8bd5\uff1a<\/p>\n
if errors.is(err, os.errdeadlineexceeded) {\n    log.error(\"timeout error\")\n}<\/pre>\n
[\u7f16\u8f91]\u5b9e\u9645\u4e0a<\/em>\uff0c\u5728\u9605\u8bfb@brit\u7684\u8bc4\u8bba\u540e\uff0c\u8fd9\u662f\u68c0\u67e5\u8be5\u9519\u8bef\u7684\u8bb0\u5f55\u65b9\u6cd5\u3002\u8bf7\u53c2\u9605 \u7684\u6587\u6863\uff1a<\/p>\n
\u5982\u679c\u8d85\u8fc7\u622a\u6b62\u65e5\u671f\uff0c\u5219\u8c03\u7528 read \u6216 write \u6216\u5176\u4ed6 i\/o \u65b9\u6cd5\u5c06\u8fd4\u56de\u4e00\u4e2a\u5305\u542b os.errdeadlineexceeded \u7684\u9519\u8bef\u3002 \u8fd9\u53ef\u4ee5\u4f7f\u7528 error.is(err, os.errdeadlineexceeded) \u8fdb\u884c\u6d4b\u8bd5\u3002<\/p>\n
\u53e6\u4e00\u4e2a\u8868\u660e\u9519\u8bef\u662f\u201c\u8d85\u65f6\u201d\u9519\u8bef\u7684\u8ff9\u8c61\u662f\u5b83\u662f\u5426\u6709 timeout() bool<\/code> \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5728\u8c03\u7528\u65f6\u8fd4\u56de true<\/code>\u3002<\/p>\n
\u8fd9\u662f \u63a5\u53e3\u7684\u4e00\u90e8\u5206\uff08\u5c3d\u7ba1\u8be5\u63a5\u53e3\u6709\u4e00\u4e2a\u989d\u5916\u7684\u65b9\u6cd5\uff0c\u5df2\u88ab\u8bb0\u5f55\u4e3a\u5df2\u5f03\u7528\uff09\uff0c\u5e76\u7531 \u7c7b\u578b\uff08\u4ee5\u53ca\u5185\u90e8 \u7c7b\u578b\uff09\u5b9e\u73b0\u3002<\/p>\n
\u6709\u51e0\u4e2a\u51fd\u6570\uff08\u4f8b\u5982 \u3001 \u548c\u516c\u5171\u51fd\u6570 \uff09\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u5c06\u9519\u8bef\u503c\u8f6c\u6362\u4e3a timeout<\/code> \u63a5\u53e3\u6765\u5b9e\u73b0\u8d85\u65f6\u68c0\u67e5\u3002<\/p>\n
\u5982\u679c\u60a8\u60f3\u5904\u7406\u53ef\u4ee5\u76f8\u4e92\u5305\u88c5\u7684\u9519\u8bef\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4f7f\u7528 errors.as(...)<\/code> \u5b9e\u73b0\u81ea\u5df1\u7684 istimeout()<\/code> \u68c0\u67e5\uff1a<\/p>\n
\/\/ isTimeout : use errors.As() to unwrap errors and check if a sub error is a Timeout error\nfunc isTimeout(err error) bool {\n    var terr interface{ Timeout() bool }\n    return errors.As(err, &terr) && terr.Timeout()\n}<\/pre>\n<\/p>\n
\u8bf7\u6ce8\u610f\uff1a<\/p>\n
\u4e0a\u9762\u7684 istimeout()<\/code> \u51fd\u6570\u548c errors.is(err, os.errdeadlineexceeded)<\/code> \u8c03\u7528\u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\u540e\u8005\u4f1a\u5c1d\u8bd5\u7cbe\u786e\u5339\u914d errdeadlineexceeded<\/code> \uff08\u8fd9\u4e3b\u8981\u662f\u901a\u8fc7\u8bbe\u7f6e setdeadline()<\/code> \u89e6\u53d1\u7684\uff09\u4e0a\u4e00\u4e9b\u7c7b\u4f3c\u6587\u4ef6\u6216\u8fde\u63a5\u7684\u5bf9\u8c61\uff09\uff0c\u800c\u540e\u4e00\u4e2a\u53ef\u80fd\u4f1a\u56e0\u4e3a\u5176\u4ed6\u539f\u56e0\u5c1d\u8bd5\u5ba3\u4f20\u201c\u6211\u662f\u8d85\u65f6\u9519\u8bef\u201d\u7684\u9519\u8bef\u8fd4\u56de true\uff08\u4f8b\u5982\uff1ahttp\u201c408 \u8bf7\u6c42\u8d85\u65f6\u201d\u54cd\u5e94\uff09<\/p>\n
\u6ce8\u610f\uff1a<\/em>\u4ee5\u4e0a\u6240\u6709\u94fe\u63a5\u5747\u6307 go 1.18.3 \u3002\u6839\u636e\u60a8\u4f7f\u7528\u7684 go \u7248\u672c\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u8c03\u6574\u4e0a\u9762\u7684\u4e00\u4e9b\u4ee3\u7801\uff08\u4f8b\u5982\uff1a\u5728 \u4e2d\u6dfb\u52a0\u4e86 os.errdeadlineexceeded<\/code> \uff09<\/p>\n
\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300a\u5904\u7406\u7f51\u7edc\u6570\u636e\u5305\u8bfb\u53d6\u8d85\u65f6\u540e\u7684\u9519\u8bef\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03Golang\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-208214","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208214","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=208214"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/208214\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=208214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=208214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=208214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}