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

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,