Brief example of an application specific context

context.go

// Struct to hold all my application's commonly used packages
type MySpecialContext struct {
    Render render.Render
    Logger   *log.Logger
    Session  sessions.Session
    Db       *mgo.Database
    Ctx      martini.Context
    App      *ApplicationConfig
}

// Wrapper to be called by m.Use(). This will .Map our special context
// into the Martini context. Then our handlers will only have to use
// the MySpecialContext struct to access all the other variables
func ContextWrapper(cfg *ApplicationConfig) martini.Handler {
    return func(c martini.Context, l *log.Logger, s sessions.Session, db *mgo.Database, r render.Render) {
        var ctx = MySpecialContext{r, l, s, db, c, cfg}
        c.Map(ctx)
    }
}

// Quick example of using MySpecialContext
func index(c MySpecialContext) {
    c.Logger.Println("Here we are")
    c.Render.HTML(200, "index", nil)
}

func main() {
    m := martini.Classic()

    // m.Use(AllTheThings)
    m.Use(ContextWrapper(myAppConfig))
}