Add support for disabling feature datasets (#6666)

This change adds support for disabling datasets, such that specific
files are not loaded into memory when running OSRM. This enables users
to not pay the memory cost for features they do not intend to use.

Initially, there are two options:
- ROUTE_GEOMETRY, for disabling overview, steps, annotations and waypoints.
- ROUTE_STEPS, for disabling steps only.

Attempts to query features for which the datasets are disabled will
lead to a DisabledDatasetException being returned.

src/tools/routed.cpp

@@ -4,6 +4,7 @@
 #include "util/meminfo.hpp"
 #include "util/version.hpp"
 
+#include "osrm/datasets.hpp"
 #include "osrm/engine_config.hpp"
 #include "osrm/exception.hpp"
 #include "osrm/osrm.hpp"
@@ -23,7 +24,6 @@
 #include <exception>
 #include <future>
 #include <iostream>
-#include <memory>
 #include <new>
 #include <string>
 #include <thread>
@@ -69,6 +69,7 @@ std::istream &operator>>(std::istream &in, EngineConfig::Algorithm &algorithm)
         throw util::RuntimeError(token, ErrorCode::UnknownAlgorithm, SOURCE_REF);
     return in;
 }
+
 } // namespace osrm::engine
 
 // overload validate for the double type to allow "unlimited" as an input
@@ -155,6 +156,10 @@ inline unsigned generateServerProgramOptions(const int argc,
          value<EngineConfig::Algorithm>(&config.algorithm)
              ->default_value(EngineConfig::Algorithm::CH, "CH"),
          "Algorithm to use for the data. Can be CH, CoreCH, MLD.") //
+        ("disable-feature-dataset",
+         value<std::vector<storage::FeatureDataset>>(&config.disable_feature_dataset)->multitoken(),
+         "Disables a feature dataset from being loaded into memory if not needed. Options: "
+         "ROUTE_STEPS, ROUTE_GEOMETRY") //
         ("max-viaroute-size",
          value<int>(&config.max_locations_viaroute)->default_value(500),
          "Max. locations supported in viaroute query") //
@@ -276,7 +281,7 @@ try
 
     if (!base_path.empty())
     {
-        config.storage_config = storage::StorageConfig(base_path);
+        config.storage_config = storage::StorageConfig(base_path, config.disable_feature_dataset);
     }
     if (!config.use_shared_memory && !config.storage_config.IsValid())
     {