{"id":44818,"date":"2022-12-20T20:04:35","date_gmt":"2023-12-31T03:16:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44818-2\/"},"modified":"2024-04-29T06:13:35","modified_gmt":"2024-04-28T22:13:35","slug":"44818-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44818-2\/","title":{"rendered":""},"content":{"rendered":"<h1>\u3010Golang\u3011\u6a19\u6e96\u30d1\u30c3\u30b1\u30fc\u30b8 context<\/h1>\n<p>Golang\u306e\u57fa\u790e\u5b66\u7fd2\u301cWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u4f5c\u6210\u307e\u3067\u306e\u5b66\u7fd2\u3092\u7d42\u3048\u305f\u306e\u3067\u3001\u5fa9\u7fd2\u3092\u517c\u306d\u3066\u307e\u3068\u3081\u3066\u3044\u304f\u3002 \u57fa\u790e\u301c\u5fdc\u7528\u307e\u3067\u3002<\/p>\n<pre class=\"post-pre\"><code>package main\r\n\r\n\/\/context\r\n\/*\r\n\u7c21\u5358\u306a\u30b4\u30eb\u30fc\u30c1\u30f3\u3068\u30c1\u30e3\u30cd\u30eb\u3092\u4f5c\u3063\u3066\u3042\u308b\u3002\r\n\r\n\u9577\u304f\u304b\u304b\u308a\u3059\u304e\u308b\u51e6\u7406\u306e\u5834\u5408\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u3066\u6b32\u3057\u3044\u5834\u5408\u306b\u4f7f\u308f\u308c\u308b\r\nWEB\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3059\u308b\u306e\u304c\u9577\u304b\u3063\u305f\u308a\u306e\u5834\u5408\u306b\u30ad\u30e3\u30f3\u30bb\u30eb\u3059\u308b\u306a\u3069\u3002\r\n*\/\r\n\r\nimport (\r\n    \"context\"\r\n    \"fmt\"\r\n    \"time\"\r\n)\r\n\r\nfunc longProcess(ctx context.Context, ch chan string) {\r\n    fmt.Println(\"\u958b\u59cb\")\r\n    time.Sleep(2 * time.Second)\r\n    fmt.Println(\"\u7d42\u4e86\")\r\n    ch &lt;- \"\u5b9f\u884c\u7d50\u679c\"\r\n}\r\n\r\nfunc main() {\r\n    ch := make(chan string)\r\n    \/\/\u9577\u304f\u304b\u304b\u308a\u3059\u304e\u308b\u5834\u5408\u30ad\u30e3\u30f3\u30bb\u30eb\u3057\u3066\u6b32\u3057\u3044\r\n    \/\/context\u3092\u4f5c\u6210\r\n    ctx := context.Background()\r\n    \/\/ctx\u30921\u79d2\u9593\u306e\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3092\u3064\u3051\u305f\u3082\u306e\u3067\u518d\u5b9a\u7fa9\r\n    \/\/longProcess\u3088\u308a\u77ed\u3044\u3068\u3001\u30a8\u30e9\u30fc\u3067\u7d42\u4e86\u3067\u304d\u308b\u3002\r\n    ctx, cancel := context.WithTimeout(ctx, 1*time.Second)\r\n\r\n    \/\/\u3082\u3057\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u3089\u3001\u5b9a\u7fa9\u3057\u305fcancel\u3092\u5b9f\u884c\r\n    \/\/ctx.Done()\u3078\u5165\u308b\r\n    defer cancel()\r\n\r\n    \/\/ctx\u3092\u6e21\u3059\r\n    \/\/1\u79d2\u9593\u3067\u51e6\u7406\u304c\u7d42\u308f\u3089\u306a\u304b\u3063\u305f\u3089\u30b4\u30eb\u30fc\u30c1\u30f3\u3092\u7d42\u4e86\u3059\u308b\r\n    go longProcess(ctx, ch)\r\n\r\n    \/\/goroutin\u306e\u76f4\u5f8c\u306b\u30ad\u30e3\u30f3\u30bb\u30eb\u3059\u308b\u3068\u3001\u5f37\u5236\u7d42\u4e86\u3055\u308c\u5b9f\u884c\u3055\u308c\u306a\u3044\r\n    \/\/\u9014\u4e2d\u3067\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u305b\u305f\u3044\u5834\u5408\u306a\u3069\r\n    \/\/cancel()\r\n\r\n    \/\/\u540d\u524d\u4ed8\u304d\u30eb\u30fc\u30d7\r\nCTXLOOP:\r\n    for {\r\n        select {\r\n        \/\/\u30ad\u30e3\u30f3\u30bb\u30eb\u3055\u308c\u305f\u3089\r\n        \/\/\u5b8c\u4e86\u3057\u306a\u304b\u3063\u305f\u3089\u3001\u30a8\u30e9\u30fc\u51fa\u529b\r\n        case &lt;-ctx.Done():\r\n            fmt.Println(\"##########Error###########\")\r\n            fmt.Println(ctx.Err())\r\n            \/\/\u30eb\u30fc\u30d7\u3092\u629c\u3051\u308b\r\n            break CTXLOOP\r\n        case s := &lt;-ch:\r\n            fmt.Println(s)\r\n            fmt.Println(\"success\")\r\n            break CTXLOOP\r\n        }\r\n\r\n    }\r\n\r\n    \/\/\u30eb\u30fc\u30d7\u3092\u629c\u3051\u305f\u3089\r\n    fmt.Println(\"\u30eb\u30fc\u30d7\u629c\u3051\u305f\")\r\n}\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u3010Golang\u3011\u6a19\u6e96\u30d1\u30c3\u30b1\u30fc\u30b8 context Golang\u306e\u57fa\u790e\u5b66\u7fd2\u301cWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u4f5c\u6210\u307e\u3067\u306e\u5b66\u7fd2\u3092 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44818","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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