Cannot close read-write session with uncommited changes in filled catalog in gRPC JSON transcoding mode

[lukashornych]

When using gRPC JSON transcoding mode (not pure gRPC-web), calling close() on session in following edge-case results in

{
  "code": 1,
  "grpc-code": "CANCELLED"
}

and 503 status code.

It happens only for our demo dataset, not in new empty catalog (empty collections may be present). It happens when

1. read write session is created

   curl -XPOST -H 'content-type: application/json; charset=utf-8; protocol=gRPC' 'http://localhost:5555/io.evitadb.externalApi.grpc.generated.EvitaService/CreateReadWriteSession' -d '{
   "catalogName": "evita",
   "commitBehavior": "WAIT_FOR_INDEX_PROPAGATION",
   "dryRun": false
   }'

2. some new stuff is written to the transaction

   curl -XPOST -H 'content-type: application/json; charset=utf-8; protocol=gRPC' -H 'sessionid: 8a64c239-c5e2-421b-b193-d8882c9f6f77' 'http://localhost:5555/io.evitadb.externalApi.grpc.generated.EvitaSessionService/DefineEntitySchema' -d '{
   "entityType": "test"
   }'

3. the session is then closed

   curl -XPOST -H 'content-type: application/json; charset=utf-8; protocol=gRPC' -H 'sessionid: 8a64c239-c5e2-421b-b193-d8882c9f6f77' 'http://localhost:5555/io.evitadb.externalApi.grpc.generated.EvitaSessionService/Close' -d '{
   "commitBehaviour": "WAIT_FOR_CONFLICT_RESOLUTION"
   }'

It can be tested in the gRPC docs tool http://localhost:5555/grpc/doc where the JSON transcoding is used (we used accidentally this mode in evitaLab too, but not anymore. The pure gRPC-web mode works just fine).

Don't know if there is any solution to this, evitaDB server logic itself doesn't throw any error, it closes the session correctly under the hood. But something along the way, maybe in the Armeria server transcoding process gets broken.

cc @Khertys, @novoj