David, Thanks a lot.
Also thanks for accepting my PR recently: Hello world
<https://github.com/capnproto/capnproto-rust/pull/175> example.
On Sunday, May 10, 2020 at 1:28:52 AM UTC+8, David Renshaw wrote:
>
> Hi Mostafa,
>
> The problem is that you're creating an independent
> futures::executor::LocalPool inside the method and then blocking on it.
> That never yields control back to the main event loop.
>
> It should work if you set things up like this:
>
> impl executor::Server for ExecutorImpl {
> fn execute(
> &mut self,
> params: executor::ExecuteParams,
> mut results: executor::ExecuteResults,
> ) -> Promise<(), Error> {
> let provider = pry!(pry!(params.get()).get_provider());
> Promise::from_future(async move {
> let storage_req = provider.get_storage_request();
> let storage_result = storage_req.send().promise.await?;
> let storage = storage_result.get()?.get_storage()?;
>
> // use storage here ...
> println!("storage = {}", storage);
> Ok(())
> })
> }
> }
>
>
>
>
> On Sat, May 9, 2020 at 10:44 AM Mostafa Sedaghat joo <[email protected]
> <javascript:>> wrote:
>
>> Hello guys,
>>
>>
>> I hope you all are doing well
>>
>>
>> I am struggling with an issue for more than a week, I decided to ask you
>> if you can help me. Currently I am working on a project for executing smart
>> contracts based on Web-Assembly for Blockchains. The project is named
>> Durian and you can check it here: https://github.com/b00f/durian
>>
>> Durian simply provides an interface for blockchains to execute smart
>> contracts. A client can ask the Durian: "Hey please execute this smart
>> contract for me", and then Durian tries to execute it. During the
>> execution, Durian might ask the client to provide some information:
>> "Blockchain please give me some information like storage, account, etc."
>> Finally the execution will return with the final result.
>>
>> Locally everything works fine. I wanted to make it as a web service. So I
>> have two choices:
>>
>> Pull model: Client asks blockchain to execute the smart contract and in
>> a loop he asks Durian: Hey Durian do you need anything that I can provide
>> for you”, Durian might say:” Yes please, Give me this storage” and so on.
>> In this case I can use gRPC or CapnProto, Both works fine.
>>
>> Push model: Client asks Durian to execute a smart contract, during the
>> execution, Durian calls client several times to get some information. Like
>> storage as an example. The point is that calling the client happens inside
>> the execution call.
>> [image: durian_flows.png]
>>
>> I decided to implement the second model using CapnP Proto. I tried and
>> tried and again tried but unfortunately I failed. The difference between
>> this model and PubSub is in the PubSub model, the publisher and the
>> subscriber are running independently.
>>
>> First of all I want to know do you think the Push model is something
>> feasible and practical?
>>
>> If yes, Why can't I call the client from the server?
>> [image: durian_diagram.png]
>>
>> I have attached my work. I made it as simple as I could. I removed the
>> Durian from it and just added only one method for getting storage. I want
>> to get storage value from the client during the execution.
>>
>> I really appreciate it if you can take a look at it and let me know which
>> part I was doing wrong?
>>
>> In advance I would like to thank you.
>>
>>
>> Regards,
>>
>> Mostafa
>>
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>>
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>>
>
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