dqzuo0327 2017-11-04 17:33
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golang:客户端tls.Conn关闭钩子

I am interacting with an http client API which accepts a *tls.Conn. I cannot change the API. I want some code to be executed when the connection is closed, but I don't see a way to do this. If I create a struct which embeds a *tls.Conn and I "override" Close(), the API won't accept the struct because go only follows the sub-type is-a relationship with interfaces - tls.Conn is not an interface.

Is there any way to get around this - is there some standard hook I can use to be notified when the client connection is closed?

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  • dthh5038 2017-11-05 00:14
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    If you're using tls.Client to construct the *tls.Conn then you can wrap the first argument to achieve your goal.

    type CloseListener struct {
        net.Conn // embed the original conn
    }
    
    func (c *CloseListener) Close() error {
        err := c.Conn.Close()
        // ... do your stuff ...
        return err
    }
    
    conn := tls.Client(&CloseListener{c}, &tls.Config{ /* ... */ }) 
    

    If you look at how tls.Conn's Close is implemented you'll see that it should call your Close implementation unless there was some error.

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