Hi Filip,
You can copy a struct from one message to another like:
outgoingRequestBuilder.setMsg(incomingRequestReader.getMsg());
There isn't a way to do this without a copy, since the contents of the
specific struct may be interleaved with other data in the message.
-Kenton
On Thu, May 7, 2020 at 3:52 AM Filip Haglund <[email protected]>
wrote:
> Is the pragmatic approach to store one capnp msg inside a `Data` field of
> another here?
>
> On Wednesday, May 6, 2020 at 11:37:57 PM UTC+2, Filip Haglund wrote:
>>
>> I have an api that speaks capnp. I want to store a subset of the incoming
>> message (a specific field) in a db and pass it onwards inside other
>> messages later on. How can I do this?
>>
>> Here's a rough sketch of events in order:
>>
>> 1. incoming request:
>>
>> struct IncomingRequest {
>> dbid @0 :Text;
>> msg @1 :Msg;
>> }
>>
>> 2. store that `Msg` field in a db
>>
>> 3. read the `Msg` field back from the db and wrap it in this type and
>> send it on:
>>
>> struct OutgoingRequest {
>> action @0 :Text;
>> critical @1 :Bool;
>> msg @2 :Msg;
>> }
>>
>> I'm using the go v2 and d libraries, in case that matters.
>>
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