{"id":206785,"date":"2025-06-12T08:22:32","date_gmt":"2025-06-12T00:22:32","guid":{"rendered":"https:\/\/server.hk\/cnblog\/206785\/"},"modified":"2025-06-12T08:22:32","modified_gmt":"2025-06-12T00:22:32","slug":"golang-%e4%b8%ad%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3-context-done-%e5%9c%a8%e5%8d%8f%e7%a8%8b%e9%98%bb%e5%a1%9e%e6%97%b6%e6%97%a0%e6%b3%95%e6%89%a7%e8%a1%8c%e7%9a%84%e9%97%ae%e9%a2%98%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/206785\/","title":{"rendered":"Golang \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f"},"content":{"rendered":"

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7
\n\u300aGOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230
\n<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01,
\n,
\n\u5904\u7406 golang context \u53d6\u6d88\u65f6\u963b\u585e\u7684 <- ctx.done()<\/strong>,\u5728 golang \u4e2d\uff0c\u4f7f\u7528 context.context \u7ba1\u7406\u534f\u7a0b\u7684\u53d6\u6d88\u975e\u5e38\u666e\u904d\u3002\u4f46\u662f\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u8c03\u7528\u4e86 cancel \u65b9\u6cd5\uff0c<- ctx.done() \u4e5f\u53ef\u80fd\u4e0d\u4f1a\u6267\u884c\u3002,
\n\u95ee\u9898\u63cf\u8ff0<\/strong>,\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a,\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5e0c\u671b\u6253\u5370 “done” \u8f93\u51fa\uff1a,\u7136\u800c\uff0c\u5b9e\u9645\u8fd0\u884c\u7ed3\u679c\u53ef\u80fd\u672a\u6253\u5370 “done” \u8f93\u51fa\u3002,
\n\u539f\u56e0\u548c\u89e3\u51b3\u65b9\u6cd5<\/strong>,\u5f53\u8c03\u7528 cancel() \u65f6\uff0c\u5982\u679c\u534f\u7a0b\u4e2d <- ctx.done() \u5728\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\u4e4b\u524d\u88ab\u963b\u585e\uff0c\u5c31\u4f1a\u51fa\u73b0\u8fd9\u79cd\u95ee\u9898\u3002\u4f8b\u5982\uff0c\u5982\u679c\u534f\u7a0b\u6b63\u5728\u7b49\u5f85\u4ece\u4e00\u4e2a\u7ba1\u9053\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5219\u5728\u6b64\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\uff0c<- ctx.done() \u5c06\u4e0d\u4f1a\u6267\u884c\u3002,\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u8003\u8651\u5728\u534f\u7a0b\u4e2d\u5173\u95ed\u7ba1\u9053\u6216\u5176\u4ed6\u963b\u585e\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a,\u8fd9\u6837\uff0c\u5f53\u8c03\u7528 cancel() \u65f6\uff0c<- ctx.done() \u5c06\u5728\u963b\u585e\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\u6267\u884c\uff0c\u5e76\u4e14\u534f\u7a0b\u5c06\u6b63\u786e\u5730\u9000\u51fa\u3002,\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aGOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f\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~GOLANG\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03GOLANG\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01,\u5904\u7406 golang context \u53d6\u6d88\u65f6\u963b\u585e\u7684 <- ctx.done(),\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7
\n\u300aGOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230
\n<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01,
\n<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> GOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f<\/span><\/p>\n

GOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f<\/h1>\n

2024-11-23 12:06:54<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211\u662fGOLANG\u7684\u4e00\u540d\u4f5c\u8005\uff0c\u4eca\u5929\u7531\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u4e00\u7bc7\u300aGOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f\u300b<\/span>\uff0c\u672c\u6587\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u5927\u5bb6\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65\uff0c\u4e5f\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u3001\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u8f6c\u53d1! \u4e0b\u9762\u5c31\u4e00\u8d77\u6765\u770b\u770b\u5427\uff01<\/p>\n

<\/p>\n

\u5904\u7406 golang context \u53d6\u6d88\u65f6\u963b\u585e\u7684 <- ctx.done()<\/strong><\/p>\n

\u5728 golang \u4e2d\uff0c\u4f7f\u7528 context.context \u7ba1\u7406\u534f\u7a0b\u7684\u53d6\u6d88\u975e\u5e38\u666e\u904d\u3002\u4f46\u662f\uff0c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u8c03\u7528\u4e86 cancel \u65b9\u6cd5\uff0c<- ctx.done() \u4e5f\u53ef\u80fd\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n

\u95ee\u9898\u63cf\u8ff0<\/strong><\/p>\n

\u8003\u8651\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n

func gen(ctx context.context) <-chan interface{} {\n    ch := make(chan interface{})\n    go func() {\n        n := 0\n        for {\n            select {\n            case <-ctx.done():\n                \/\/ \u671f\u671b\u6253\u5370 \"done\" \u8f93\u51fa\n            default:\n                n += 1\n                ch <- n\n            }\n        }\n    }()\n    return ch\n}<\/pre>\n
\u5728 main \u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u5e0c\u671b\u6253\u5370 “done” \u8f93\u51fa\uff1a<\/p>\n
ctx, cancel := context.withcancel(context.background())\nfor n := range gen(ctx) {\n    fmt.println(n)\n    if n == 5 {\n        cancel()\n        break\n    }\n}<\/pre>\n
\u7136\u800c\uff0c\u5b9e\u9645\u8fd0\u884c\u7ed3\u679c\u53ef\u80fd\u672a\u6253\u5370 “done” \u8f93\u51fa\u3002<\/p>\n
\u539f\u56e0\u548c\u89e3\u51b3\u65b9\u6cd5<\/strong><\/p>\n
\u5f53\u8c03\u7528 cancel() \u65f6\uff0c\u5982\u679c\u534f\u7a0b\u4e2d <- ctx.done() \u5728\u6267\u884c\u5176\u4ed6\u64cd\u4f5c\u4e4b\u524d\u88ab\u963b\u585e\uff0c\u5c31\u4f1a\u51fa\u73b0\u8fd9\u79cd\u95ee\u9898\u3002\u4f8b\u5982\uff0c\u5982\u679c\u534f\u7a0b\u6b63\u5728\u7b49\u5f85\u4ece\u4e00\u4e2a\u7ba1\u9053\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5219\u5728\u6b64\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\uff0c<- ctx.done() \u5c06\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n
\u8981\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u8003\u8651\u5728\u534f\u7a0b\u4e2d\u5173\u95ed\u7ba1\u9053\u6216\u5176\u4ed6\u963b\u585e\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a<\/p>\n
func gen(ctx context.Context) <-chan interface{} {\n    ch := make(chan interface{})\n    go func() {\n        n := 0\n        for {\n            var closeCh bool \/\/ \u5173\u95ed\u6807\u8bb0\n\n            select {\n            case <-ctx.Done():\n                closeCh = true \/\/ \u8bbe\u7f6e\u5173\u95ed\u6807\u8bb0\n                fmt.Println(\"done\")\n                close(ch) \/\/ \u5173\u95ed\u7ba1\u9053\n                return\n            default:\n                n += 1\n                ch <- n\n            }\n\n            if closeCh { \n              break \/\/ \u5173\u95ed\u6807\u8bb0\u53d8\u4e3a\u771f\uff0c\u5219\u9000\u51fa\u5faa\u73af\n            }\n        }\n    }()\n    return ch\n}\n\n\/\/ ... \u5269\u4f59\u4ee3\u7801\u7565 ...<\/pre>\n
\u8fd9\u6837\uff0c\u5f53\u8c03\u7528 cancel() \u65f6\uff0c<- ctx.done() \u5c06\u5728\u963b\u585e\u8bfb\u53d6\u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\u6267\u884c\uff0c\u5e76\u4e14\u534f\u7a0b\u5c06\u6b63\u786e\u5730\u9000\u51fa\u3002<\/p>\n
\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300aGOLANG \u4e2d\u5982\u4f55\u89e3\u51b3 context.Done() \u5728\u534f\u7a0b\u963b\u585e\u65f6\u65e0\u6cd5\u6267\u884c\u7684\u95ee\u9898\uff1f\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~GOLANG\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03GOLANG\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n
\n
\n <\/dt>\n
\n   Vue\u4e2d\u5982\u4f55\u76f4\u63a5\u751f\u6210JWT\uff1f\n <\/dd>\n<\/dl>\n
\n
\n <\/dt>\n
\n   \u8bbe\u8ba1\u770b\u4e0d\u89c1\u7684\u4e1c\u897f\uff1a\u6211\u4f5c\u4e3a\u8f6f\u4ef6\u5de5\u7a0b\u5e08\u7684\u5de5\u4f5c\n <\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u54c8\u55bd\uff01\u5927\u5bb6\u597d\uff0c\u5f88\u9ad8\u5174\u53c8\u89c1\u9762\u4e86\uff0c\u6211...<\/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-206785","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206785","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=206785"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/206785\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=206785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=206785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=206785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}