json_query transaction mode

Author: StekPerepolnen

ydb/core/viewer/json_query.h

@@ -39,6 +39,7 @@ class TJsonQuery : public TViewerPipeClient<TJsonQuery> {
     TString Stats;
     TString Syntax;
     TString QueryId;
+    TString TransactionMode;
     bool Direct = false;
     bool IsBase64Encode = true;
 
@@ -82,6 +83,7 @@ class TJsonQuery : public TViewerPipeClient<TJsonQuery> {
         Schema = StringToSchemaType(schemaStr);
         Syntax = params.Get("syntax");
         QueryId = params.Get("query_id");
+        TransactionMode = params.Get("transaction_mode");
         Direct = FromStringWithDefault<bool>(params.Get("direct"), Direct);
         IsBase64Encode = FromStringWithDefault<bool>(params.Get("base64"), true);
     }
@@ -97,6 +99,7 @@ class TJsonQuery : public TViewerPipeClient<TJsonQuery> {
             Action = Action.empty() ? requestData["action"].GetStringSafe({}) : Action;
             Syntax = Syntax.empty() ? requestData["syntax"].GetStringSafe({}) : Syntax;
             QueryId = QueryId.empty() ? requestData["query_id"].GetStringSafe({}) : QueryId;
+            TransactionMode = TransactionMode.empty() ? requestData["transaction_mode"].GetStringSafe({}) : TransactionMode;
         }
         return success;
     }
@@ -243,9 +246,17 @@ class TJsonQuery : public TViewerPipeClient<TJsonQuery> {
         } else if (Action == "execute-data") {
             request.SetAction(NKikimrKqp::QUERY_ACTION_EXECUTE);
             request.SetType(NKikimrKqp::QUERY_TYPE_SQL_DML);
-            request.mutable_txcontrol()->mutable_begin_tx()->mutable_serializable_read_write();
-            request.mutable_txcontrol()->set_commit_tx(true);
             request.SetKeepSession(false);
+            if (TransactionMode == "online-read-only") {
+                request.mutable_txcontrol()->mutable_begin_tx()->mutable_online_read_only();
+            } else if (TransactionMode == "stale-read-only") {
+                request.mutable_txcontrol()->mutable_begin_tx()->mutable_stale_read_only();
+            } else if (TransactionMode == "snapshot-read-only") {
+                request.mutable_txcontrol()->mutable_begin_tx()->mutable_snapshot_read_only();
+            } else {
+                request.mutable_txcontrol()->mutable_begin_tx()->mutable_serializable_read_write();
+                request.mutable_txcontrol()->set_commit_tx(true);
+            }
         } else if (Action == "explain" || Action == "explain-ast" || Action == "explain-data") {
             request.SetAction(NKikimrKqp::QUERY_ACTION_EXPLAIN);
             request.SetType(NKikimrKqp::QUERY_TYPE_SQL_DML);
@@ -662,6 +673,17 @@ YAML::Node TJsonRequestSwagger<TJsonQuery>::GetSwagger() {
             type: string
             enum: [profile, full]
             required: false
+          - name: transaction_mode
+            in: query
+            description: >
+              transaction mode:
+               * `serializable-read-write`
+               * `online-read-only`
+               * `stale-read-only`
+               * `snapshot-read-only`
+            type: string
+            enum: [serializable-read-write, online-read-only, stale-read-only, snapshot-read-only]
+            required: false
           - name: direct
             in: query
             description: force processing query on current node