Finsh grpc stream without extra empty message for query service.

ydb/core/grpc_services/base/base.h

@@ -407,8 +407,8 @@ class IRequestCtx
     , public virtual IRequestCtxBase
 {
     friend class TProtoResponseHelper;
-
 public:
+    using EStreamCtrl = NYdbGrpc::IRequestContextBase::EStreamCtrl;
     virtual google::protobuf::Message* GetRequestMut() = 0;
 
     virtual void SetRuHeader(ui64 ru) = 0;
@@ -418,7 +418,7 @@ class IRequestCtx
     virtual void SetStreamingNotify(NYdbGrpc::IRequestContextBase::TOnNextReply&& cb) = 0;
     virtual void FinishStream(ui32 status) = 0;
 
-    virtual void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status) = 0;
+    virtual void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status, EStreamCtrl flag = EStreamCtrl::CONT) = 0;
 
     virtual void Reply(NProtoBuf::Message* resp, ui32 status = 0) = 0;
 
@@ -1193,7 +1193,7 @@ class TGRpcRequestWrapperImpl
         return GetPeerMetaValues(NYdb::YDB_REQUEST_TYPE_HEADER);
     }
 
-    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status) override {
+    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status, IRequestCtx::EStreamCtrl flag = IRequestCtx::EStreamCtrl::CONT) override {
         // res->data() pointer is used inside grpc code.
         // So this object should be destroyed during grpc_slice destroying routine
         auto res = new TString;
@@ -1208,7 +1208,7 @@ class TGRpcRequestWrapperImpl
                     (void*)(res->data()), res->size(), freeResult, res);
         grpc::Slice sl = grpc::Slice(slice, grpc::Slice::STEAL_REF);
         auto data = grpc::ByteBuffer(&sl, 1);
-        Ctx_->Reply(&data, status);
+        Ctx_->Reply(&data, status, flag);
     }
 
     void SetCostInfo(float consumed_units) override {

ydb/core/grpc_services/local_rpc/local_rpc.h

@@ -183,7 +183,7 @@ class TLocalRpcCtx : public NGRpcService::IRequestOpCtx {
         Y_ABORT("Unimplemented for local rpc");
     }
 
-    virtual void SendSerializedResult(TString&&, Ydb::StatusIds::StatusCode) override {
+    virtual void SendSerializedResult(TString&&, Ydb::StatusIds::StatusCode, EStreamCtrl) override {
         Y_ABORT("Unimplemented for local rpc");
     }
 

ydb/core/grpc_services/query/rpc_execute_query.cpp

@@ -359,10 +359,10 @@ class TExecuteQueryRPC : public TActorBootstrapped<TExecuteQueryRPC> {
     void Handle(NKqp::TEvKqp::TEvQueryResponse::TPtr& ev, const TActorContext&) {
         auto& record = ev->Get()->Record.GetRef();
 
-        NYql::TIssues issues;
         const auto& issueMessage = record.GetResponse().GetQueryIssues();
-        NYql::IssuesFromMessage(issueMessage, issues);
 
+        bool hasTrailingMessage = false;
+
         if (record.GetYdbStatus() == Ydb::StatusIds::SUCCESS) {
             Request_->SetRuHeader(record.GetConsumedRu());
 
@@ -372,8 +372,6 @@ class TExecuteQueryRPC : public TActorBootstrapped<TExecuteQueryRPC> {
 
             AuditContextAppend(Request_.get(), *Request_->GetProtoRequest(), response);
 
-            bool hasTrailingMessage = false;
-
             if (kqpResponse.HasTxMeta()) {
                 hasTrailingMessage = true;
                 response.mutable_tx_meta()->set_id(kqpResponse.GetTxMeta().id());
@@ -386,13 +384,20 @@ class TExecuteQueryRPC : public TActorBootstrapped<TExecuteQueryRPC> {
 
             if (hasTrailingMessage) {
                 response.set_status(Ydb::StatusIds::SUCCESS);
+                response.mutable_issues()->CopyFrom(issueMessage);
                 TString out;
                 Y_PROTOBUF_SUPPRESS_NODISCARD response.SerializeToString(&out);
-                Request_->SendSerializedResult(std::move(out), record.GetYdbStatus());
+                const auto finishStreamFlag = NYdbGrpc::IRequestContextBase::EStreamCtrl::FINISH;
+                Request_->SendSerializedResult(std::move(out), record.GetYdbStatus(), finishStreamFlag);
+                this->PassAway();
             }
         }
 
-        ReplyFinishStream(record.GetYdbStatus(), issues);
+        if (!hasTrailingMessage) {
+            NYql::TIssues issues;
+            NYql::IssuesFromMessage(issueMessage, issues);
+            ReplyFinishStream(record.GetYdbStatus(), issueMessage);
+        }
     }
 
 private:
@@ -437,10 +442,11 @@ class TExecuteQueryRPC : public TActorBootstrapped<TExecuteQueryRPC> {
             response.set_status(status);
             response.mutable_issues()->CopyFrom(message);
             Y_PROTOBUF_SUPPRESS_NODISCARD response.SerializeToString(&out);
-            Request_->SendSerializedResult(std::move(out), status);
+            const auto finishStreamFlag = NYdbGrpc::IRequestContextBase::EStreamCtrl::FINISH;
+            Request_->SendSerializedResult(std::move(out), status, finishStreamFlag);
+        } else {
+            Request_->FinishStream(status);
         }
-
-        Request_->FinishStream(status);
         this->PassAway();
     }
 

ydb/core/kafka_proxy/actors/kafka_create_partitions_actor.cpp

@@ -153,7 +153,7 @@ class TKafkaCreatePartitionsRequest : public NKikimr::NGRpcService::IRequestOpCt
         Y_UNUSED(status);
     };
 
-    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status) override {
+    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status, EStreamCtrl) override {
         Y_UNUSED(in);
         Y_UNUSED(status);
     };

ydb/core/kafka_proxy/actors/kafka_create_topics_actor.cpp

@@ -151,9 +151,10 @@ class TKafkaCreateTopicRequest : public NKikimr::NGRpcService::IRequestOpCtx {
         Y_UNUSED(status);
     };
 
-    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status) override {
+    void SendSerializedResult(TString&& in, Ydb::StatusIds::StatusCode status, EStreamCtrl flag) override {
         Y_UNUSED(in);
         Y_UNUSED(status);
+        Y_UNUSED(flag);
     };
 
     void Reply(NProtoBuf::Message* resp, ui32 status = 0) override {

ydb/core/public_http/grpc_request_context_wrapper.cpp

@@ -34,9 +34,10 @@ namespace NKikimr::NPublicHttp {
         ReplySender(RequestContext, JsonSettings, resp, status);
     }
 
-    void TGrpcRequestContextWrapper::Reply(grpc::ByteBuffer* resp, ui32 status) {
+    void TGrpcRequestContextWrapper::Reply(grpc::ByteBuffer* resp, ui32 status, EStreamCtrl ctrl) {
         Y_UNUSED(resp);
         Y_UNUSED(status);
+        Y_UNUSED(ctrl);
         Y_ABORT_UNLESS(false, "TGrpcRequestContextWrapper::Reply");
     }
 

ydb/core/public_http/grpc_request_context_wrapper.h

@@ -27,7 +27,7 @@ class TGrpcRequestContextWrapper : public NYdbGrpc::IRequestContextBase {
     virtual NProtoBuf::Message* GetRequestMut();
     virtual NYdbGrpc::TAuthState& GetAuthState();
     virtual void Reply(NProtoBuf::Message* resp, ui32 status = 0);
-    virtual void Reply(grpc::ByteBuffer* resp, ui32 status = 0);
+    virtual void Reply(grpc::ByteBuffer* resp, ui32 status = 0, EStreamCtrl ctrl = EStreamCtrl::CONT);
     virtual void ReplyUnauthenticated(const TString& in);
     virtual void ReplyError(grpc::StatusCode code, const TString& msg, const TString& details);
     virtual TInstant Deadline() const;

ydb/library/grpc/server/grpc_request.h

@@ -204,8 +204,8 @@ class TGRpcRequestImpl
         WriteDataOk(resp, status);
     }
 
-    void Reply(grpc::ByteBuffer* resp, ui32 status) override {
-        WriteByteDataOk(resp, status);
+    void Reply(grpc::ByteBuffer* resp, ui32 status, EStreamCtrl ctrl) override {
+        WriteByteDataOk(resp, status, ctrl);
     }
 
     void ReplyError(grpc::StatusCode code, const TString& msg, const TString& details) override {
@@ -314,7 +314,7 @@ class TGRpcRequestImpl
         }
     }
 
-    void WriteByteDataOk(grpc::ByteBuffer* resp, ui32 status) {
+    void WriteByteDataOk(grpc::ByteBuffer* resp, ui32 status, EStreamCtrl ctrl) {
         auto sz = resp->Length();
         if (Writer_) {
             GRPC_LOG_DEBUG(Logger_, "[%p] issuing response Name# %s data# byteString peer# %s", this, Name_,
@@ -332,14 +332,23 @@ class TGRpcRequestImpl
             // because of std::function cannot hold move-only captured object
             // we allocate shared object on heap to avoid buffer copy
             auto uResp = MakeIntrusive<TUniversalResponse<TOut>>(resp);
-            auto cb = [this, uResp = std::move(uResp), sz, status]() {
+            const bool finish = ctrl == EStreamCtrl::FINISH;
+            auto cb = [this, uResp = std::move(uResp), sz, status, finish]() {
                 GRPC_LOG_DEBUG(Logger_, "[%p] issuing response Name# %s data# byteString peer# %s (pushed to grpc)",
                     this, Name_, this->Context.peer().c_str());
-                StateFunc_ = &TThis::NextReply;
+
+                StateFunc_ = finish ? &TThis::SetFinishDone : &TThis::NextReply;
+
                 ResponseSize += sz;
                 ResponseStatus = status;
                 OnBeforeCall();
-                StreamWriter_->Write(*uResp, GetGRpcTag());
+                if (finish) {
+                    Finished_ = true;
+                    const auto option = grpc::WriteOptions().set_last_message();
+                    StreamWriter_->WriteAndFinish(*uResp, option, grpc::Status::OK, GetGRpcTag());
+                } else {
+                    StreamWriter_->Write(*uResp, GetGRpcTag());
+                }
             };
             StreamAdaptor_->Enqueue(std::move(cb), false);
         }

ydb/library/grpc/server/grpc_request_base.h

@@ -46,6 +46,11 @@ class IRequestContextBase: public TThrRefBase {
         ERROR,
         CANCEL
     };
+    enum class EStreamCtrl {
+        CONT = 0,   // Continue stream
+        FINISH = 1, // Finish stream just after this reply
+    };
+
     using TAsyncFinishResult = NThreading::TFuture<EFinishStatus>;
 
     using TOnNextReply = std::function<void (size_t left)>;
@@ -65,7 +70,9 @@ class IRequestContextBase: public TThrRefBase {
 
     //! Send serialised response (The request shoult be created for bytes response type)
     //! Implementation can swap ByteBuffer
-    virtual void Reply(grpc::ByteBuffer* resp, ui32 status = 0) = 0;
+
+    //! ctrl - controll stream behaviour. Ignored in case of unary call
+    virtual void Reply(grpc::ByteBuffer* resp, ui32 status = 0, EStreamCtrl ctrl = EStreamCtrl::CONT) = 0;
 
     //! Send grpc UNAUTHENTICATED status
     virtual void ReplyUnauthenticated(const TString& in) = 0;