英文:
How to serialize a complex interface with unexported fields?
问题
我需要对一些复杂的接口（template.Template）进行序列化。它有许多未导出的字段，而gob不愿意与它们一起工作。有什么建议吗？
附注：实际上，我正在尝试将解析后的模板放入App Engine上的内存缓存（memcache）中。
英文:
I need to serialize some complex interface (template.Template). It has many unexported fields, and gob don't want to work with them. Any suggestions?
P.S. Actualy, I trying to put a parsed template to memcache on App Engine.
答案1
得分: 5
简短的回答是，未导出字段通常有其原因 - 例如，template.Template 包含在解析过程中会发生变化的信息 - 因此，我建议不要使用 reflect 自己对其进行序列化。然而，最近在 gob 中添加了 GobEncoder 和 GobDecoder 接口；如果您需要序列化带有未导出字段的复杂结构体，请鼓励包的作者实现这些接口。更好的做法是自己实现它们（对于 template.Template 来说应该不难），并且贡献您的补丁。
英文:
The short answer is that there's usually a reason for unexported fields--template.Template, for instance, contains information which changes during parsing--so I'd advise against serializing them yourself with reflect. However, the GobEncoder and GobDecoder interfaces were recently added to gob; if you need to serialize a complex struct with unexported fields, encourage the author of the package to implement these interfaces. Even better, implement them yourself (shouldn't be hard for template.Template) and contribute your patch.
答案2
得分: 1
如果类型来自另一个包（例如模板），则无法使用Go的任何当前序列化库（gob，json，bson等）完成此操作。也不应该这样做，因为这些字段是未导出的。
但是，如果确实需要，您可以使用reflect包编写自己的序列化器，具体使用Value.Field()和相关方法来获取未导出的字段。然后，您只需要以一种可以稍后解码的方式存储它们。
英文:
If the type is from another package (such as template) this can't be done with any of the current serialization libs for Go (gob, json, bson, etc.). Nor should it be done, because the fields are unexported.
However, if you really need to, you can write your own serializer using package reflect, specifically Value.Field() and friends to get the unexported fields. Then you just need to store them in a way that you can decode later.
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