async_op.hpp

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#pragma once
 
#include "barretenberg/serialize/msgpack_impl.hpp"
#include <memory>
#include <napi.h>
#include <utility>
 
namespace bb::nodejs {
 
using async_fn = std::function<void(msgpack::sbuffer&)>;
 
class AsyncOperation : public Napi::AsyncWorker {
  public:
    AsyncOperation(Napi::Env env, std::shared_ptr<Napi::Promise::Deferred> deferred, async_fn fn)
        : Napi::AsyncWorker(env)
        , _fn(std::move(fn))
        , _deferred(std::move(deferred))
    {}
 
    AsyncOperation(const AsyncOperation&) = delete;
    AsyncOperation& operator=(const AsyncOperation&) = delete;
    AsyncOperation(AsyncOperation&&) = delete;
    AsyncOperation& operator=(AsyncOperation&&) = delete;
 
    ~AsyncOperation() override = default;
 
    void Execute() override
    {
        try {
            _fn(_result);
        } catch (const std::exception& e) {
            SetError(e.what());
        }
    }
 
    void OnOK() override
    {
        auto buf = Napi::Buffer<char>::Copy(Env(), _result.data(), _result.size());
        _deferred->Resolve(buf);
    }
    void OnError(const Napi::Error& e) override { _deferred->Reject(e.Value()); }
 
  private:
    async_fn _fn;
    std::shared_ptr<Napi::Promise::Deferred> _deferred;
    msgpack::sbuffer _result;
};
 
} // namespace bb::nodejs