chore: initial commit

rediska/common/QueueMessage.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <variant>
+#include <vector>
+
+#include "rediska/common/enums.hpp"
+#include "rediska/common/types.hpp"
+#include "rediska/common/MessageArguments.hpp"
+#include <grpcpp/grpcpp.h>
+#include <grpcpp/support/async_stream.h> // for ServerAsyncStreamingInterface completeness
+
+// TODO: get rid of forward declaration somehow maybe
+struct BaseRequestManager;
+
+struct RequestEvent {
+    BaseRequestManager& manager;
+};
+
+// This just leaves the responder for you to delete.
+struct FinishEvent {
+    std::unique_ptr<grpc::internal::ServerAsyncStreamingInterface> responder;
+};
+
+using EventVariant = std::variant<RequestEvent, FinishEvent>;
+
+struct QueueMessage {
+    CacheValueId type;
+    CacheKey key;
+    OperationId operation;
+    MessageArguments arguments;
+    std::unique_ptr<grpc::internal::ServerAsyncStreamingInterface> responder;
+
+    template<typename ResponseT>
+    void respond(ResponseT response) {
+        if (auto* writer = dynamic_cast<grpc::ServerAsyncResponseWriter<ResponseT>*>(responder.get())) {
+            writer->Finish(response, grpc::Status::OK, std::make_unique<EventVariant>(FinishEvent { std::move(responder) }).release());
+            responder = nullptr;
+        } else {
+            throw std::runtime_error("Invalid responder type in QueueMessage::respond");
+        }
+    }
+};