Adds a limit for number of results returned in Nearest service, resolves #2872

unit_tests/library/limits.cpp

@@ -4,6 +4,7 @@
 #include "args.hpp"
 
 #include "osrm/match_parameters.hpp"
+#include "osrm/nearest_parameters.hpp"
 #include "osrm/route_parameters.hpp"
 #include "osrm/table_parameters.hpp"
 #include "osrm/trip_parameters.hpp"
@@ -136,4 +137,33 @@ BOOST_AUTO_TEST_CASE(test_match_limits)
     BOOST_CHECK(code == "TooBig"); // per the New-Server API spec
 }
 
+BOOST_AUTO_TEST_CASE(test_nearest_limits)
+{
+    const auto args = get_args();
+    BOOST_REQUIRE_EQUAL(args.size(), 1);
+
+    using namespace osrm;
+
+    EngineConfig config;
+    config.storage_config = {args[0]};
+    config.use_shared_memory = false;
+    config.max_results_nearest = 2;
+
+    OSRM osrm{config};
+
+    NearestParameters params;
+    params.coordinates.emplace_back(util::FloatLongitude{}, util::FloatLatitude{});
+    params.number_of_results = 10000;
+
+    json::Object result;
+
+    const auto rc = osrm.Nearest(params, result);
+
+    BOOST_CHECK(rc == Status::Error);
+
+    // Make sure we're not accidentally hitting a guard code path before
+    const auto code = result.values["code"].get<json::String>().value;
+    BOOST_CHECK(code == "TooBig"); // per the New-Server API spec
+}
+
 BOOST_AUTO_TEST_SUITE_END()