[protobuf] 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

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[protobuf] Re: proto3 - message inside messages

[Jordan Kaye]

I believe you're looking for 
oneof: https://developers.google.com/protocol-buffers/docs/proto#oneof

--Jordan

On Wednesday, September 14, 2016 at 2:44:40 PM UTC-5, Sachin Gole wrote:
>
> Hi All,
>
> I have one requirement where I wanted to pass request object either Socket 
> or GetHost
>
> Can any one know how to define that in Action message
>
> message Action {
>
> uint32 protocol_version = 1; // protocol version
> int64 request_uid = 2; // request uid
> int64 socket_id = 3; // value 0 is reserved for static methods
> uint32 service_type = 4; // type of service which should process 
> message
> uint32 left_messages = 5;
> message request_object = 6;
> }
>
> message Socket {
>uint32 id = 1;
> }
>
> message GetHost {
> string url = 1;
> }
>
>
>

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