I got a solution for my problem by Xiaolan Lee.
I should have written the testp.proto file this way:
message my_mess {
message data {
optional uint64 x = 1;
optional uint64 y = 2;
optional uint64 z = 3;
}
optional data a_data = 1
optional bytes signature = 2;
}
Then it works.
On Saturday, January 17, 2015 at 1:05:27 AM UTC+2, realcr wrote:
>
> Hi Group,
> I am trying to serialize/deserialize a sub message using Protobuf.
> The reasons for this is signing. I want to be able to sign part of my
> message. To be able to do that, I need to canonicalize it somehow.
>
> If it matters, I use protbuf 3.0.0-alpha (With the proto2 language) with
> Python3.4.
>
> Example file: testp.proto
>
> package my_package;
>
> message my_mess {
> message data {
> optional uint64 x = 1;
> optional uint64 y = 2;
> optional uint64 z = 3;
> }
> optional bytes signature = 4;
> }
>
> In this example, I want to sign the data part of the message. Therefore I
> want to serialize only my_mess.data, sign it, put the signature into
> my_mess.signature, and then serialize the full message my_mess.
>
> Compiling testp.proto:
>
> $ protoc -I=. --python_out=. testp.proto
> [libprotobuf WARNING google/protobuf/compiler/parser.cc:471] No syntax
> specified for the proto file. Please use 'syntax = "proto2";' or 'syntax =
> "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
>
> I noticed that mm.data have the methods SerializeToString and
> SerializePartialToString.
> However, it seems like it is not possible to run them directly. Here are
> my naive attempts:
>
> $ ipython
>
> In [1]: import testp_pb2
> In [2]: mm = testp_pb2.my_mess()
> In [3]: mm.data.x = 1
> In [4]: mm.data.y = 2
> In [5]: mm.data.z = 3
> In [6]: mm.data.SerializeToString()
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> <ipython-input-6-faa8e25906ca> in <module>()
> ----> 1 mm.data.SerializeToString()
>
> TypeError: SerializeToString() missing 1 required positional argument:
> 'self'
>
> In [7]: mm.data.SerializePartialToString()
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> <ipython-input-7-4b2c1ff0b1c9> in <module>()
> ----> 1 mm.data.SerializePartialToString()
>
> TypeError: SerializePartialToString() missing 1 required positional
> argument: 'self'
>
>
> I was wondering if there is some simple solution I'm missing. I am open to
> other suggestions, if you have an idea of signing just a part of the
> message in an elegant way.
>
> Note that this question was cross posted at:
>
> http://stackoverflow.com/questions/27958571/serializing-part-of-a-message-with-protobuf
> However I got no response in there.
>
> Thank you for your help.
> Regards,
> real.
>
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