bump up viewer/query version to 3 (#8315)

Author: adameat

ydb/core/viewer/json_handlers.h

@@ -48,6 +48,14 @@ struct TJsonHandlers {
         }
         return it->second.get();
     }
+
+    int GetCapabilityVersion(const TString& name) const {
+        auto it = Capabilities.find(name);
+        if (it == Capabilities.end()) {
+            return 0;
+        }
+        return it->second;
+    }
 };
 
 class TSimpleYamlBuilder {

ydb/core/viewer/json_handlers_viewer.cpp

@@ -227,7 +227,7 @@ void InitViewerWhoAmIJsonHandler(TJsonHandlers& handlers) {
 }
 
 void InitViewerQueryJsonHandler(TJsonHandlers& handlers) {
-    handlers.AddHandler("/viewer/query", new TJsonHandler<TJsonQuery>(TJsonQuery::GetSwagger()), 2);
+    handlers.AddHandler("/viewer/query", new TJsonHandler<TJsonQuery>(TJsonQuery::GetSwagger()), 3);
 }
 
 void InitViewerNetInfoJsonHandler(TJsonHandlers& handlers) {

ydb/core/viewer/viewer.cpp

@@ -318,6 +318,11 @@ class TViewer : public TActorBootstrapped<TViewer>, public IViewer {
         return capabilities;
     }
 
+    int GetCapabilityVersion(const TString& name) override {
+        std::lock_guard guard(JsonHandlersMutex);
+        return JsonHandlers.GetCapabilityVersion(name);
+    }
+
     void RegisterVirtualHandler(
             NKikimrViewer::EObjectType parentObjectType,
             TVirtualHandlerType handler) override {

ydb/core/viewer/viewer.h

@@ -201,6 +201,7 @@ class IViewer {
     virtual TActorId FindRunningQuery(const TString& queryId) = 0;
 
     virtual NJson::TJsonValue GetCapabilities() = 0;
+    virtual int GetCapabilityVersion(const TString& name) = 0;
 };
 
 void SetupPQVirtualHandlers(IViewer* viewer);

ydb/core/viewer/viewer_query.h

@@ -434,6 +434,7 @@ class TJsonQuery : public TViewerPipeClient {
     void HandleReply(NKqp::TEvKqp::TEvQueryResponse::TPtr& ev) {
         BLOG_TRACE("Query response received");
         NJson::TJsonValue jsonResponse;
+        jsonResponse["version"] = Viewer->GetCapabilityVersion("/viewer/query");
         if (ev->Get()->Record.GetRef().GetYdbStatus() == Ydb::StatusIds::SUCCESS) {
             QueryResponse.Set(std::move(ev));
             MakeOkReply(jsonResponse, QueryResponse->Record.GetRef());