在代码中声明但未调用的函数时继续恐慌

Question

上下文： https://github.com/fusspawn/tserver/blob/master/app/controllers/gorp.go

作为尝试设置 gorm 的一部分，我尝试转换标准 revel/gorp 示例。

不过。即使定义了 Begin()、Commit()、Rollback() 方法也足以导致恐慌。

   TRACE 2015/09/06 17:37:47 harness.go:126: Rebuild                                                                                                  
   INFO  2015/09/06 17:37:47 build.go:172: Cleaning dir tmp                                                                                           
   INFO  2015/09/06 17:37:47 build.go:172: Cleaning dir routes                                                                                        
   INFO  2015/09/06 17:37:47 build.go:172: Cleaning dir tmp                                                                                           
   INFO  2015/09/06 17:37:47 build.go:172: Cleaning dir routes                                                                                        
   TRACE 2015/09/06 17:37:47 build.go:151: Exec: [/usr/bin/git --git-   dir=/home/fusspawn/go/src/github.com/fusspawn/tserver/.git describe --always --   dirty]                                                                                                                                               
   TRACE 2015/09/06 17:37:47 build.go:94: Exec: [/usr/bin/go build -ldflags    -X github.com/fusspawn/tserver/app.APP_VERSION "git-2588ef1" -tags  -o /ho
  me/fusspawn/go/bin/revel.d/github.com/fusspawn/tserver/tserver   github.com/fusspawn/tserver/app/tmp]                                                
   TRACE 2015/09/06 17:39:14 app.go:56: Exec app:   /home/fusspawn/go/bin/revel.d/github.com/fusspawn/tserver/tserver    [/home/fusspawn/go/bin/revel.d/git
   hub.com/fusspawn/tserver/tserver -port=46276 -  importPath=github.com/fusspawn/tserver -runMode=dev]                                                 
   INFO  2015/09/06 17:39:14 revel.go:329: Loaded module static                                                                                       
   INFO  2015/09/06 17:39:14 revel.go:329: Loaded module testrunner                                                                                   
   INFO  2015/09/06 17:39:14 revel.go:206: Initialized Revel v0.12.0 (2015-03-25) for >= go1.3                                                        
   INFO  2015/09/06 17:39:14 main.go:30: Running revel server                                                                                         
   TRACE 2015/09/06 17:39:14 controller.go:402: Registered controller: App                                                                            
   panic: reflect: call of reflect.Value.Type on zero Value                                                                                           

   goroutine 1 [running]:                                                                                                                             
   runtime.panic(0x88cec0, 0xc21011b7a0)                                                                                                              
    /usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6                                                                                              
   reflect.Value.Type(0x0, 0x0, 0x0, 0x0, 0x0)                                                                                                        
    /usr/lib/go/src/pkg/reflect/value.go:1698 +0x79                                                                                            
    github.com/revel/revel.findControllers(0x7f365698bea8, 0x9186e0, 0x0, 0x0, 0x0)                                                                    
    /home/fusspawn/go/src/github.com/revel/revel/controller.go:321 +0x25a                                                                      
    github.com/revel/revel.RegisterController(0x9172a0, 0x0, 0xc2100c4bf0,    0x2, 0x2)                                                                   
     /home/fusspawn/go/src/github.com/revel/revel/controller.go:400 +0x1f3                                                                      
    main.main()                                                                                                                                        
     /home/fusspawn/go/src/github.com/fusspawn/tserver/app/tmp/main.go:150  +0x141b                                                              
     TRACE 2015/09/06 17:39:14 controller.go:402: Registered controller:     GormController                                                                 
     TRACE 2015/09/06 17:39:14 controller.go:402: Registered controller: Static                                                                         
     TRACE 2015/09/06 17:39:14 controller.go:402: Registered controller:  TestRunner

注释掉方法定义将停止恐慌。我似乎无法理解如何不调用这些方法（注意 revel.InterceptMethod 调用被注释掉）会导致恐慌发生：/

Answer 1

根据 Revel 文档，系统通过 scanning your source directory 寻找处于调试模式的控制器，以查找任何执行 *Revel.Controller 匿名嵌入的内容。您看到的错误是由于 Revel 在此控制器扫描初始化期间进行动态反射并搞砸了。所以现在的问题是：为什么扫描控制器时遇到问题？

您的代码似乎试图扩展 EventStream, which the Revel debug controller-discovery code will try to read as a Controller. However, the code as it stands is currently violating expectations of the framework by embedding a *GormController instead of a GormController; see the last part of the Controllers documentation 中的控制器。

我认为控制器发现逻辑因此而令人窒息。修复 EventStream 结构定义。

如果这确实为您解决了问题，您可能应该向 Revel 人员发送错误报告，因为您收到的错误消息非常糟糕并且是非本地的，因为它没有提到失败时尝试注册为控制器的事物的名称。

在代码中声明但未调用的函数时继续恐慌

Go panics on when having functions declared in code but not called

go

revel

go-gorm