Store metadata about original OSM data, and return it in the API response, if available.

include/engine/api/route_api.hpp

@@ -68,6 +68,11 @@ class RouteAPI : public BaseAPI
         response.values["waypoints"] = BaseAPI::MakeWaypoints(all_start_end_points);
         response.values["routes"] = std::move(jsRoutes);
         response.values["code"] = "Ok";
+        auto data_timestamp = facade.GetTimestamp();
+        if (!data_timestamp.empty())
+        {
+            response.values["data_version"] = data_timestamp;
+        }
     }
 
   protected:

include/engine/datafacade/contiguous_internalmem_datafacade.hpp

@@ -137,6 +137,7 @@ class ContiguousInternalMemoryDataFacadeBase : public BaseDataFacade
     extractor::Datasources *m_datasources;
 
     std::uint32_t m_check_sum;
+    StringView m_data_timestamp;
     util::vector_view<util::Coordinate> m_coordinate_list;
     extractor::PackedOSMIDsView m_osmnodeid_list;
     util::vector_view<std::uint32_t> m_lane_description_offsets;
@@ -183,6 +184,8 @@ class ContiguousInternalMemoryDataFacadeBase : public BaseDataFacade
 
         m_check_sum = *index.GetBlockPtr<std::uint32_t>("/common/connectivity_checksum");
 
+        m_data_timestamp = make_timestamp_view(index, "/common/timestamp");
+
         std::tie(m_coordinate_list, m_osmnodeid_list) =
             make_nbn_data_view(index, "/common/nbn_data");
 
@@ -432,6 +435,11 @@ class ContiguousInternalMemoryDataFacadeBase : public BaseDataFacade
 
     std::uint32_t GetCheckSum() const override final { return m_check_sum; }
 
+    std::string GetTimestamp() const override final
+    {
+        return std::string(m_data_timestamp.begin(), m_data_timestamp.end());
+    }
+
     GeometryID GetGeometryIndex(const NodeID id) const override final
     {
         return edge_based_node_data.GetGeometryID(id);

include/engine/datafacade/datafacade_base.hpp

@@ -74,6 +74,8 @@ class BaseDataFacade
 
     virtual std::uint32_t GetCheckSum() const = 0;
 
+    virtual std::string GetTimestamp() const = 0;
+
     // node and edge information access
     virtual util::Coordinate GetCoordinateOfNode(const NodeID id) const = 0;
 

include/extractor/extractor_config.hpp

@@ -55,6 +55,7 @@ struct ExtractorConfig final : storage::IOConfig
                                       ".osrm.geometry",
                                       ".osrm.nbg_nodes",
                                       ".osrm.ebg_nodes",
+                                      ".osrm.timestamp",
                                       ".osrm.edges",
                                       ".osrm.ebg",
                                       ".osrm.ramIndex",
@@ -82,6 +83,7 @@ struct ExtractorConfig final : storage::IOConfig
     boost::filesystem::path input_path;
     boost::filesystem::path profile_path;
     std::vector<boost::filesystem::path> location_dependent_data_paths;
+    std::string data_version;
 
     unsigned requested_num_threads;
     unsigned small_component_size;

include/extractor/files.hpp

@@ -308,6 +308,26 @@ inline void writeTurnLaneData(const boost::filesystem::path &path,
     storage::serialization::write(writer, "/common/turn_lanes/data", turn_lane_data);
 }
 
+// reads .osrm.timestamp
+template <typename TimestampDataT>
+inline void readTimestamp(const boost::filesystem::path &path, TimestampDataT &timestamp)
+{
+    const auto fingerprint = storage::tar::FileReader::VerifyFingerprint;
+    storage::tar::FileReader reader{path, fingerprint};
+
+    storage::serialization::read(reader, "/common/timestamp", timestamp);
+}
+
+// writes .osrm.timestamp
+template <typename TimestampDataT>
+inline void writeTimestamp(const boost::filesystem::path &path, const TimestampDataT &timestamp)
+{
+    const auto fingerprint = storage::tar::FileWriter::GenerateFingerprint;
+    storage::tar::FileWriter writer{path, fingerprint};
+
+    storage::serialization::write(writer, "/common/timestamp", timestamp);
+}
+
 // reads .osrm.maneuver_overrides
 template <typename StorageManeuverOverrideT, typename NodeSequencesT>
 inline void readManeuverOverrides(const boost::filesystem::path &path,

include/storage/storage_config.hpp

@@ -58,6 +58,7 @@ struct StorageConfig final : IOConfig
                     ".osrm.turn_duration_penalties",
                     ".osrm.datasource_names",
                     ".osrm.names",
+                    ".osrm.timestamp",
                     ".osrm.properties",
                     ".osrm.icd",
                     ".osrm.maneuver_overrides"},

include/storage/view_factory.hpp

@@ -272,6 +272,11 @@ inline auto make_partition_view(const SharedDataIndex &index, const std::string
         level_data_ptr, std::move(partition), std::move(cell_to_children)};
 }
 
+inline auto make_timestamp_view(const SharedDataIndex &index, const std::string &name)
+{
+    return util::StringView(index.GetBlockPtr<char>(name), index.GetBlockEntries(name));
+}
+
 inline auto make_cell_storage_view(const SharedDataIndex &index, const std::string &name)
 {
     auto source_boundary = make_vector_view<NodeID>(index, name + "/source_boundary");

include/util/typedefs.hpp

@@ -79,6 +79,7 @@ using EdgeDistance = float;
 using SegmentWeight = std::uint32_t;
 using SegmentDuration = std::uint32_t;
 using TurnPenalty = std::int16_t; // turn penalty in 100ms units
+using DataTimestamp = std::string;
 
 static const std::size_t INVALID_INDEX = std::numeric_limits<std::size_t>::max();