{"id":463,"date":"2019-10-10T15:55:26","date_gmt":"2019-10-10T07:55:26","guid":{"rendered":"https:\/\/www.myway5.com\/?p=463"},"modified":"2023-07-05T21:39:38","modified_gmt":"2023-07-05T13:39:38","slug":"go-context","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/","title":{"rendered":"\u7406\u89e3go context"},"content":{"rendered":"<h2>\u7406\u89e3context<\/h2>\n<p>\u5728\u6211\u521a\u63a5\u89e6context\u5305\u65f6\uff0c\u6211\u662f\u6709\u4e00\u70b9\u8ff7\u60d1\u7684\u3002\u56e0\u4e3a\u5728\u5176\u4ed6\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5f88\u5c11\u6709\u63a5\u89e6\u5230context\u5305\u7c7b\u4f3c\u7684\u7528\u6cd5\u3002\u6bd4\u5982\u5728js\u7ed8\u5236canvas\u4e2d\u7684context\uff0c\u4e5f\u53ea\u662f\u4f5c\u4e3a\u4fdd\u7559\u4e0a\u4e0b\u6587\u64cd\u4f5c\u6765\u7528\u7684\u3002\u5728go\u8bed\u8a00\u7684context\u5305\u4e2d\uff0c\u540c\u6837\u4e5f\u53ef\u4ee5\u5f53\u6210\u4e0a\u4e0b\u6587\u6765\u7406\u89e3\uff0c\u4f46\u662f\u5728\u770b\u5f85context\u63d0\u4f9b\u7684\u80fd\u529b\u65f6\uff0c\u8981\u4ece\u4ee5\u4e0b\u4e24\u70b9\u6765\u7406\u89e3\uff1a<\/p>\n<ul>\n<li>context\u63d0\u4f9b\u4e86\u4e00\u79cd\u7ba1\u7406\u591a\u4e2agoroutine\u7684\u673a\u5236\u3002<\/li>\n<li>context\u6700\u7ec8\u5f62\u6210\u4e86\u4e00\u79cd\u6811\u5f62\u7ed3\u6784\u3002<\/li>\n<\/ul>\n<p>\u5728\u6df1\u5165\u4e4b\u524d\uff0c\u8ba9\u6211\u4eec\u56de\u5fc6\u4e00\u4e0b\u591a\u7ebf\u7a0b\/\u8fdb\u7a0b\u6a21\u578b\u4e2d\uff0c\u4e3b\u7ebf\u7a0b\/\u8fdb\u7a0b\u662f\u5982\u4f55\u7ba1\u7406\u5b50\u7ebf\u7a0b\/\u8fdb\u7a0b\u7684\u3002\u5982\u679c\u5b50\u7ebf\u7a0b\/\u8fdb\u7a0b\u53c8\u6d3e\u751f\u4e86\u5176\u4ed6\u7684\u7ebf\u7a0b\/\u8fdb\u7a0b\u5462\uff1f\u8fd9\u4e00\u5b9a\u662f\u4e00\u4e2a\u5934\u75bc\u7684\u95ee\u9898\u3002<\/p>\n<p>\u5728go\u8bed\u8a00\u4e2d\uff0c\u534f\u7a0b\u4e5f\u9762\u4e34\u4e86\u540c\u6837\u7684\u95ee\u9898\u3002\u56e0\u6b64\u5b98\u65b9\u5728go1.7\u7248\u672c\u4e2d\u5f15\u5165\u4e86context\u5305\u3002\u90a3\u4e48context\u63d0\u4f9b\u4e86\u4ec0\u4e48\u6837\u7684\u80fd\u529b\u6765\u7ba1\u7406\u534f\u7a0b\u5462\uff1f\u5148\u770b\u4e00\u4e2a<code>withCancel<\/code>\u7684\u7b80\u5355\u7684\u4f8b\u5b50<\/p>\n<pre><code class=\"line-numbers\">func watch(ctx context.Context) {\n    for {\n        select {\n        case &lt;-ctx.Done():\n            log.Println(\"\u9000\u51fa\")\n            return\n\n        default:\n            log.Println(\"\u6267\u884c\u903b\u8f91\")\n            time.Sleep(2 * time.Second)\n        }\n    }\n}\n\nfunc withCancel() {\n    ctx, cancel := context.WithCancel(context.Background())\n\n    go watch(ctx)\n    go watch(ctx)\n    go watch(ctx)\n\n    time.Sleep(6 * time.Second)\n    fmt.Println(\"\u53ef\u4ee5\u4e86\uff0c\u901a\u77e5\u5b50\u534f\u7a0b\u505c\u6b62\")\n    cancel()\n    \/\/\u4e3a\u4e86\u68c0\u6d4b\u5b50\u534f\u7a0b\u662f\u5426\u505c\u6b62\uff0c\u5982\u679c\u6ca1\u6709\u8f93\u51fa\uff0c\u5c31\u8868\u793a\u505c\u6b62\u4e86\n    time.Sleep(5 * time.Second)\n}\n<\/code><\/pre>\n<p>\u8c03\u7528withCancel\u7684\u8f93\u51fa\u5982\u4e0b:<\/p>\n<pre><code class=\"line-numbers\">2019\/09\/30 00:18:48 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:48 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:48 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:50 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:50 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:50 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:52 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:52 \u6267\u884c\u903b\u8f91\n2019\/09\/30 00:18:52 \u6267\u884c\u903b\u8f91\n\u53ef\u4ee5\u4e86\uff0c\u901a\u77e5\u5b50\u534f\u7a0b\u505c\u6b62\n2019\/09\/30 00:18:54 \u9000\u51fa\n2019\/09\/30 00:18:54 \u9000\u51fa\n2019\/09\/30 00:18:54 \u9000\u51fa\n<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u901a\u8fc7<code>context.WithCancel<\/code>\u65b9\u6cd5\u751f\u6210\u4e86\u4e00\u4e2actx\u548c\u4e00\u4e2acancel\uff0c\u7136\u540e\u4e3b\u52a8\u8c03\u7528cancel\u5c31\u53ef\u4ee5\u901a\u8fc7\u6240\u6709\u7684\u5b50\u534f\u7a0b\u9000\u51fa\u4e86\u3002\u5728<code>watch<\/code>\u65b9\u6cd5\u7684\u5b9e\u73b0\u4e2d\uff0c\u6211\u4eec\u662f\u901a\u8fc7<code>select<\/code>\u673a\u5236\u6765\u5b9e\u73b0\u7684\uff0c\u4e00\u65e6context\u7684<code>Done()<\/code>\u65b9\u6cd5\u6709\u503c\uff0c\u5c31\u4f1a\u8c03\u7528return\u9000\u51fa\uff0c\u5426\u5219\u7684\u8bdd\u5c31\u6267\u884c<code>default<\/code>\u4e2d\u6211\u4eec\u7684\u4e1a\u52a1\u903b\u8f91\u3002<\/p>\n<p>\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u968f\u65f6\u901a\u77e5\u6240\u6709\u7684\u5b50\u534f\u7a0b\u9000\u51fa\u4e86\u3002\u5728\u4e0a\u9762\u8bf4\u5230\uff0ccontext\u6700\u7ec8\u5f62\u6210\u4e86\u4e00\u79cd\u6811\u5f62\u7ed3\u6784\uff0c\u662f\u56e0\u4e3a\u5728\u5b50\u534f\u7a0b\u4e2d\u4e5f\u53ef\u4ee5\u7ee7\u7eed\u4f7f\u7528\u65b0\u7684\u534f\u7a0b\uff0c\u8fd9\u6837\u5c31\u5f62\u6210\u4e86\u4e00\u4e2a\u6811\u5f62\u7684\u8c03\u7528\u4e86\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/09\/context\u534f\u7a0b.png\" alt=\"\u534f\u7a0b\u7684\u6811\u5f62\u7ed3\u6784\" \/><\/p>\n<p>\u6211\u4eec\u57281\u4e2d\u4f7f\u7528cancel\u65b9\u6cd5\uff0c\u5c31\u53ef\u4ee5\u5411\u4e0b\u4f20\u64ad\uff0c\u57282~10\u53f7\u534f\u7a0b\u4e2d\u5168\u90e8\u9000\u51fa\u3002<\/p>\n<p>\u7b80\u5355\u7684\u4e86\u89e3<code>context<\/code>\u5305\u7684\u4f7f\u7528\u540e\uff0c\u53ef\u4ee5\u770b\u4e00\u4e0b<code>context.Context<\/code>\u8fd9\u4e2a\u63a5\u53e3\uff0c\u4e3a\u4e86\u7b80\u6d01\uff0c\u6211\u5220\u9664\u4e86\u6e90\u4ee3\u7801\u4e2d\u7684\u6ce8\u91ca\u3002<\/p>\n<pre><code class=\"line-numbers\">type Context interface {\n    Deadline() (deadline time.Time, ok bool)\n    Done() &lt;-chan struct{}\n    Err() error\n    Value(key interface{}) interface{}\n}\n<\/code><\/pre>\n<p><code>Context<\/code>\u63a5\u53e3\u603b\u5171\u63d0\u4f9b\u4e864\u4e2a\u65b9\u6cd5\u3002<\/p>\n<ul>\n<li><code>Deadline()<\/code>\u7528\u6765\u83b7\u53d6\u5f53\u524dcontext\u7684\u53d6\u6d88\u65f6\u95f4\uff0c\u7b2c\u4e8c\u4e2a\u8fd4\u56de\u503c<code>ok<\/code>\u7b49\u4e8efalse\u7684\u65f6\u5019\uff0c\u8868\u793a\u6ca1\u6709\u8bbe\u7f6e\u3002<\/li>\n<li><code>Done()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e86\u4e00\u4e2a<code>chan<\/code>\uff0c\u5f53chan\u4e2d\u8bfb\u53d6\u5230\u503c\u7684\u65f6\u5019\uff0c\u8868\u793a\u7236context\u5df2\u7ecf\u53d1\u8d77\u4e86\u53d6\u6d88\u7684\u8bf7\u6c42\uff0c\u90a3\u4e48\u5f53\u524d\u534f\u7a0b\u5f00\u59cb\u505a\u76f8\u5173\u7684\u6e05\u7406\u5de5\u4f5c\u7136\u540e\u9000\u51fa\u3002<\/li>\n<li><code>Err()<\/code>\u8fd4\u56decontext\u7684\u53d6\u6d88\u539f\u56e0<\/li>\n<li><code>Value()<\/code>\u65b9\u6cd5\u7528\u6765\u901a\u8fc7\u4e00\u4e2akey\u83b7\u53d6\u5f53\u524dContext\u4e0a\u4e0e\u4e4b\u5bf9\u5e94\u7684\u503c\u3002<\/li>\n<\/ul>\n<h2>\u7406\u89e3Context\u7684\u6811\u5f62\u7ed3\u6784<\/h2>\n<p>go\u4e2d\u5927\u91cf\u7684\u5e93\u90fd\u4f7f\u7528\u4e86context\u673a\u5236\uff0c\u6bd4\u5982<code>database\/sql<\/code>\u5e93\uff0c<code>net\/http<\/code>\u5e93\u7b49\u7b49\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u5e93\u90fd\u652f\u6301\u4e86context\uff0c\u4f7f\u5f97\u6211\u4eec\u5728\u7a0b\u5e8f\u4e2d\u5f88\u5bb9\u6613\u901a\u8fc7context\u6765\u7ba1\u7406\u6240\u6709\u65b0\u5efa\u7684\u534f\u7a0b\uff0c\u800c\u4e0d\u7528\u81ea\u5df1\u5b9e\u73b0\u590d\u6742\u7684\u673a\u5236\u6765\u7ba1\u7406\u3002\u4e00\u65e6\u6211\u4eec\u9700\u8981\u53d6\u6d88\uff0c\u53ea\u9700\u8981\u5728root context\u8c03\u7528cancel\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n<h2>\u4e00\u4e9b\u57fa\u672c\u4f7f\u7528<\/h2>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86withCancel\u6765\u5b9e\u4f8b\u5316\u4e00\u4e2a\u53ef\u4ee5\u624b\u52a8\u53d6\u6d88\u7684context\u3002context\u5305\u4e2d\u540c\u6837\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5176\u4ed6\u7684\u65b9\u6cd5\u3002<\/p>\n<pre><code class=\"line-numbers\">func WithDeadline(parent Context, d time.Time) (Context, CancelFunc)\nfunc WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc)\n<\/code><\/pre>\n<p><code>WithDeadline<\/code>\u53ef\u4ee5\u8bbe\u7f6e\u622a\u6b62\u65f6\u95f4\u3002\u4f1a\u5230\u8fbe\u6307\u5b9a\u65f6\u95f4\u65f6\u81ea\u52a8\u53d6\u6d88\u3002\u5f53\u7136\u4e5f\u53ef\u4ee5\u8c03\u7528<code>CancelFunc<\/code>\u6765\u624b\u52a8\u53d6\u6d88\u3002<\/p>\n<p><code>WithTimeout<\/code>\u53ef\u4ee5\u8bbe\u7f6e\u5728\u4e00\u6bb5\u65f6\u95f4\u540e\u81ea\u52a8\u53d6\u6d88\uff0c\u548c<code>WithDeadline<\/code>\u7c7b\u4f3c\u3002<\/p>\n<h2>\u53c2\u8003<\/h2>\n<p><a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.flysnow.org\/2017\/05\/12\/go-in-action-go-context.html\">Go\u8bed\u8a00\u5b9e\u6218\u7b14\u8bb0(\u4e8c\u5341)<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/juejin.im\/post\/5a6873fef265da3e317e55b6\">Golang Context\u6df1\u5165\u7406\u89e3<\/a><br \/>\n<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/blog.golang.org\/context\">Go Concurrency Patterns: context<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7406\u89e3context \u5728\u6211\u521a\u63a5\u89e6context\u5305\u65f6\uff0c\u6211\u662f\u6709\u4e00\u70b9\u8ff7\u60d1\u7684\u3002\u56e0\u4e3a\u5728\u5176\u4ed6\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5f88\u5c11\u6709\u63a5\u89e6\u5230cont &hellip; <a href=\"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u7406\u89e3go context<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67],"tags":[96,77],"class_list":["post-463","post","type-post","status-publish","format-standard","hentry","category-go","tag-context","tag-go"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u7406\u89e3go context - \u4e00\u53ea\u5b89\u9759\u7684\u732b<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7406\u89e3go context - \u4e00\u53ea\u5b89\u9759\u7684\u732b\" \/>\n<meta property=\"og:description\" content=\"\u7406\u89e3context \u5728\u6211\u521a\u63a5\u89e6context\u5305\u65f6\uff0c\u6211\u662f\u6709\u4e00\u70b9\u8ff7\u60d1\u7684\u3002\u56e0\u4e3a\u5728\u5176\u4ed6\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\u5f88\u5c11\u6709\u63a5\u89e6\u5230cont &hellip; \u7ee7\u7eed\u9605\u8bfb\u7406\u89e3go context\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/\" \/>\n<meta property=\"og:site_name\" content=\"\u4e00\u53ea\u5b89\u9759\u7684\u732b\" \/>\n<meta property=\"article:published_time\" content=\"2019-10-10T07:55:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-05T13:39:38+00:00\" \/>\n<meta name=\"author\" content=\"jiangpengfei\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"jiangpengfei\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.myway5.com\/index.php\/2019\/10\/10\/go-context\/\"},\"author\":{\"name\":\"jiangpengfei\",\"@id\":\"https:\/\/www.myway5.com\/#\/schema\/person\/b19267e8b106343431e163ec96950685\"},\"headline\":\"\u7406\u89e3go 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