dongshengli6384 2015-06-19 07:02
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如何使用Couchbase Gocb检查错误代码?

When handling errors returned by gocb (the official Couchbase Go Client) I would like to check for specific status codes (e.g. StatusKeyNotFound or StatusKeyExists).

Like so

_, err := bucket.Get(key, entity)
if err != nil {
    if err == gocb.ErrKeyNotFound {
        ...
    }
}

Can this be done?

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1条回答

  • douhe5092 2015-06-19 12:03
    关注

    Can this be done?

    In gocbcore, error.go we have the following definition:

    type memdError struct {
        code StatusCode
    }
    
    // ...
    
    func (e memdError) KeyNotFound() bool {
        return e.code == StatusKeyNotFound
    }
    func (e memdError) KeyExists() bool {
        return e.code == StatusKeyExists
    }
    func (e memdError) Temporary() bool {
        return e.code == StatusOutOfMemory || e.code == StatusTmpFail
    }
    func (e memdError) AuthError() bool {
        return e.code == StatusAuthError
    }
    func (e memdError) ValueTooBig() bool {
        return e.code == StatusTooBig
    }
    func (e memdError) NotStored() bool {
        return e.code == StatusNotStored
    }
    func (e memdError) BadDelta() bool {
        return e.code == StatusBadDelta
    }
    

    Note that memdError is unexported, so you can't use it in a type assertion.

    So, take a different approach: define your own interface:

    type MyErrorInterface interface {
        KeyNotFound() bool
        KeyExists() bool
    }
    

    And assert whatever error you get back from gocb to your interface:

    _, err := bucket.Get(key, entity)
    
    if err != nil {
        if se, ok = err.(MyErrorInterface); ok {
            if se.KeyNotFound() {
                // handle KeyNotFound
            }
            if se.KeyExists() {
                // handle KeyExists
            }
        } else {
            // no information about states
        }
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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