error when marker does not exist (#167)

src/rpc/RPC.cpp

@@ -145,7 +145,6 @@ static std::unordered_map<std::string, std::function<Result(Context const&)>>
         {"ledger_data", &doLedgerData},
         {"ledger_entry", &doLedgerEntry},
         {"ledger_range", &doLedgerRange},
-        {"ledger_data", &doLedgerData},
         {"nft_buy_offers", &doNFTBuyOffers},
         {"nft_sell_offers", &doNFTSellOffers},
         {"subscribe", &doSubscribe},

src/rpc/handlers/LedgerData.cpp

@@ -73,6 +73,7 @@ doLedgerData(Context const& context)
         return *status;
 
     auto lgrInfo = std::get<ripple::LedgerInfo>(v);
+
     boost::json::object header;
     // no marker means this is the first call, so we return header info
     if (!marker)
@@ -106,6 +107,13 @@ doLedgerData(Context const& context)
             response[JS(ledger)] = header;
         }
     }
+    else
+    {
+        if (!outOfOrder &&
+            !context.backend->fetchLedgerObject(
+                *marker, lgrInfo.seq, context.yield))
+            return Status{Error::rpcINVALID_PARAMS, "markerDoesNotExist"};
+    }
 
     response[JS(ledger_hash)] = ripple::strHex(lgrInfo.hash);
     response[JS(ledger_index)] = lgrInfo.seq;