Detecting modifications to Protobuf messages

[Jordan Kaye]

Hello all,

I've been searching for the better part of a day without finding much information on this topic, so I figured I'd go ahead and ask here.

I'm looking for a way to receive notifications of changes to individual Protobuf message instances. I have an application that would like to persist the changes of a message through time (event sourcing), and it would make things extremely clean if there were some way to accomplish this.

If I were working in C++, it seems that there would at least be the possibility of using the message differencer for this (I could copy a message before applying some logic to it then run the differencer on the the copy and the message after the modification), but the code that I currently have is in Python.

I understand that this is probably a very specific use case, but is there any way for me to achieve something like this?

Thanks,

Jordan

[Adam Cozzette]

I have to admit that I'm not very familiar with the protocol buffers API for Python, so hopefully someone more knowledgeable can chime in. But given that Python does not have a message differencer, I think your best bet would be to try to use the reflection API to implement something similar. It should allow you to iterate over the fields for a particular message type and check for differences between two protos. On this page under "Advanced Usage" there are some hints about how to do this.

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