On Jun 27, 12:33 pm, Ruslan Mullakhmetov <[email protected]> wrote:
> Hi
>
> I'm trying to deserialize different protobuf messages in python. Is the
> any way to get message type from unserialized message?
>
> Like dynamic message in cpp and java ?
Presumably you're using the pattern where you have a containing
message and all of your sub-messages are optional fields of the
containing message, but you only ever expect one of those sub-fields
to be set.
message Hello {
optional string name = 1;
optional reply_cookie = 2;
}
message ILoveYou {
optional float strength = 1;
}
message WontYouTellMeYourName {
required uint64 reply_cookie = 1;
}
message Doors {
optional Hello hello = 1;
optional ILoveYou i_love_you = 2;
optional WontYouTellMeYourName name_request = 3;
}
In Python, you can do something like:
doors = Doors.FromString(s)
doors.ListFields()[0][0].number
And you will get a number like 1, 2 or 3 depending on which message
you're being sent. You might also get an IndexError exception if
someone sent you a message sub-messages in it at all.
The ListFields function gives you a list of (descriptor,
message_object) tuples. The descriptor describes the message_object in
the terms of the enclosing message, and one of the things a descriptor
records is the field id for the message object.
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