fix redirects for serverless databases (#13856)

Author: adameat

ydb/core/viewer/json_pipe_req.cpp

@@ -754,11 +754,15 @@ void TViewerPipeClient::RequestDone(ui32 requests) {
     if (!DelayedRequests.empty()) {
         SendDelayedRequests();
     }
-    if (Requests == 0) {
+    if (Requests == 0 && !PassedAway) {
         ReplyAndPassAway();
     }
 }
 
+void TViewerPipeClient::CancelAllRequests() {
+    DelayedRequests.clear();
+}
+
 void TViewerPipeClient::Handle(TEvTabletPipe::TEvClientConnected::TPtr& ev) {
     if (ev->Get()->Status != NKikimrProto::OK) {
         ui32 requests = FailPipeConnect(ev->Get()->TabletId);
@@ -777,12 +781,14 @@ void TViewerPipeClient::HandleResolveResource(TEvTxProxySchemeCache::TEvNavigate
                 Bootstrap(); // retry bootstrap without redirect this time
             } else {
                 DatabaseBoardInfoResponse = MakeRequestStateStorageEndpointsLookup(SharedDatabase);
+                --Requests; // don't count this request
             }
         } else {
-            return ReplyAndPassAway(GetHTTPBADREQUEST("text/plain", "Failed to resolve database - shared database not found"));
+            AddEvent("Failed to resolve database - shared database not found");
+            Direct = true;
+            Bootstrap(); // retry bootstrap without redirect this time
         }
     }
-    RequestDone();
 }
 
 void TViewerPipeClient::HandleResolveDatabase(TEvTxProxySchemeCache::TEvNavigateKeySetResult::TPtr& ev) {
@@ -792,15 +798,18 @@ void TViewerPipeClient::HandleResolveDatabase(TEvTxProxySchemeCache::TEvNavigate
             TSchemeCacheNavigate::TEntry& entry(DatabaseNavigateResponse->Get()->Request->ResultSet.front());
             if (entry.DomainInfo && entry.DomainInfo->ResourcesDomainKey && entry.DomainInfo->DomainKey != entry.DomainInfo->ResourcesDomainKey) {
                 ResourceNavigateResponse = MakeRequestSchemeCacheNavigate(TPathId(entry.DomainInfo->ResourcesDomainKey));
+                --Requests; // don't count this request
                 Become(&TViewerPipeClient::StateResolveResource);
             } else {
                 DatabaseBoardInfoResponse = MakeRequestStateStorageEndpointsLookup(CanonizePath(entry.Path));
+                --Requests; // don't count this request
             }
         } else {
-            return ReplyAndPassAway(GetHTTPBADREQUEST("text/plain", "Failed to resolve database - not found"));
+            AddEvent("Failed to resolve database - not found");
+            Direct = true;
+            Bootstrap(); // retry bootstrap without redirect this time
         }
     }
-    RequestDone();
 }
 
 void TViewerPipeClient::HandleResolve(TEvStateStorage::TEvBoardInfo::TPtr& ev) {
@@ -809,11 +818,11 @@ void TViewerPipeClient::HandleResolve(TEvStateStorage::TEvBoardInfo::TPtr& ev) {
         if (DatabaseBoardInfoResponse->IsOk()) {
             return ReplyAndPassAway(MakeForward(GetNodesFromBoardReply(DatabaseBoardInfoResponse->GetRef())));
         } else {
+            AddEvent("Failed to resolve database nodes");
             Direct = true;
             Bootstrap(); // retry bootstrap without redirect this time
         }
     }
-    RequestDone();
 }
 
 void TViewerPipeClient::HandleTimeout() {
@@ -838,6 +847,7 @@ STATEFN(TViewerPipeClient::StateResolveResource) {
 
 void TViewerPipeClient::RedirectToDatabase(const TString& database) {
     DatabaseNavigateResponse = MakeRequestSchemeCacheNavigate(database);
+    --Requests; // don't count this request
     Become(&TViewerPipeClient::StateResolveDatabase);
 }
 
@@ -860,6 +870,8 @@ void TViewerPipeClient::PassAway() {
         Send(TActivationContext::InterconnectProxy(nodeId), new TEvents::TEvUnsubscribe());
     }
     ClosePipes();
+    CancelAllRequests();
+    PassedAway = true;
     TBase::PassAway();
 }
 

ydb/core/viewer/json_pipe_req.h

@@ -43,6 +43,7 @@ class TViewerPipeClient : public TActorBootstrapped<TViewerPipeClient> {
     TString SharedDatabase;
     bool Direct = false;
     ui32 Requests = 0;
+    bool PassedAway = false;
     ui32 MaxRequestsInFlight = 200;
     NWilson::TSpan Span;
     IViewer* Viewer = nullptr;
@@ -303,6 +304,7 @@ class TViewerPipeClient : public TActorBootstrapped<TViewerPipeClient> {
     TString MakeForward(const std::vector<ui32>& nodes);
 
     void RequestDone(ui32 requests = 1);
+    void CancelAllRequests();
     void AddEvent(const TString& name);
     void Handle(TEvTabletPipe::TEvClientConnected::TPtr& ev);
     void HandleResolveDatabase(TEvTxProxySchemeCache::TEvNavigateKeySetResult::TPtr& ev);