[{"data":1,"prerenderedAt":234},["ShallowReactive",2],{"tag-异步-1":3},{"title":4,"articles":5,"hot_article":19,"month_arch":82,"total":230,"cover":231},"异步 - 独孤影的博客",[6],{"id":7,"title":8,"uri":9,"author":10,"tags":11,"created_at":16,"view_count":17,"content":18},111,"gin.Context 异步调用踩坑","gin-context-gorountine","duguying",[12,13,14,15],"gin","context","异步","goroutine","2023-12-08 12:20:18",448,"\u003Cp>事情的背景是这样了，我在gin框架的action中有个异步调用逻辑，然后异步调用需要使用\u003Ccode class=\"inline-code\">context.Context\u003C\u002Fcode>接口作为参数传入，异步调用的模块中会从context中取request_id作为追踪追踪标记。于是我就直接讲*gin.Context作为参数传入了异步调用中。\u003C\u002Fp>\n\n\u003Cp>然后灾难就发生了，我日志记录中能查到当前请求的request_id，但是发现条数不对，异步请求中记录的日志条数有10条，我用request_id去搜索，只查到了4条，最后我只能添加另外标记，通过另外的标记查询到10条日志，让我奇怪的是，另外6条日志的request_id却不是当前请求的request_id。\u003C\u002Fp>\n\n\u003Cp>最后，我发现gin.Context专门有个Copy方法，是将context拷贝一份，我调用Copy拷贝一份context之后将拷贝的context传入异步调用，果然10条日志的request_id一致了。看来，从gin框架传入进来的context在不同的action中是复用的。然后在请求处理完毕之后，会给其他请求复用，这样传给异步调用模块的context中的request_id已经变了。\u003C\u002Fp>\n\n\u003Cpre style=\"color:#e6edf3;background-color:#0d1117;white-space:pre-wrap;word-break:break-word;\">\u003Ccode>\u003Cspan style=\"display:flex;\">\u003Cspan>r.\u003Cspan style=\"color:#d2a8ff;font-weight:bold\">GET\u003C\u002Fspan>(\u003Cspan style=\"color:#a5d6ff\">"\u002Fasync"\u003C\u002Fspan>, \u003Cspan style=\"color:#ff7b72\">func\u003C\u002Fspan>(c \u003Cspan style=\"color:#ff7b72;font-weight:bold\">*\u003C\u002Fspan>gin.Context) {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\t\u003Cspan style=\"color:#8b949e;font-style:italic\">\u002F\u002F 需要搞一个副本\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#8b949e;font-style:italic\">\u003C\u002Fspan>\tcopyContext \u003Cspan style=\"color:#ff7b72;font-weight:bold\">:=\u003C\u002Fspan> c.\u003Cspan style=\"color:#d2a8ff;font-weight:bold\">Copy\u003C\u002Fspan>()\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\t\u003Cspan style=\"color:#8b949e;font-style:italic\">\u002F\u002F 异步处理\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\u003Cspan style=\"color:#8b949e;font-style:italic\">\u003C\u002Fspan>\t\u003Cspan style=\"color:#ff7b72\">go\u003C\u002Fspan> \u003Cspan style=\"color:#ff7b72\">func\u003C\u002Fspan>() {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\t\ttime.\u003Cspan style=\"color:#d2a8ff;font-weight:bold\">Sleep\u003C\u002Fspan>(\u003Cspan style=\"color:#a5d6ff\">3\u003C\u002Fspan> \u003Cspan style=\"color:#ff7b72;font-weight:bold\">*\u003C\u002Fspan> time.Second)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\t\tlog.\u003Cspan style=\"color:#d2a8ff;font-weight:bold\">Println\u003C\u002Fspan>(\u003Cspan style=\"color:#a5d6ff\">"异步执行："\u003C\u002Fspan> \u003Cspan style=\"color:#ff7b72;font-weight:bold\">+\u003C\u002Fspan> copyContext.Request.URL.Path)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>\t}()\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"display:flex;\">\u003Cspan>})\n\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fcode>\u003C\u002Fpre>\n\n\u003Cp>这里必须要谨记，如果需要在action中异步调用并使用context传参，必须要将context.Copy()之后再传入。否则context就会被其他协程修改。\u003C\u002Fp>\n",{"title":20,"list":21},"最热文章",[22,28,34,40,46,52,58,64,70,76],{"id":23,"title":24,"uri":25,"author":10,"created_at":26,"view_count":27},28,"docker容器目录与主机目录同步","\u002Farticle\u002Fdocker容器目录与主机目录同步","2014-12-31 12:34:08",15570,{"id":29,"title":30,"uri":31,"author":10,"created_at":32,"view_count":33},21,"beego中使用fis","\u002Farticle\u002Fbeego中使用fis","2014-12-03 10:47:56",9250,{"id":35,"title":36,"uri":37,"author":10,"created_at":38,"view_count":39},20,"用github登录，oauth开发","\u002Farticle\u002F用github登录，oauth开发","2014-11-23 13:33:37",9113,{"id":41,"title":42,"uri":43,"author":10,"created_at":44,"view_count":45},18,"windows服务注册工具nssm","\u002Farticle\u002Fwindows服务注册工具nssm","2014-10-31 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