Expose get entity by guid function (#264)

* Expose get entity by guid function

Signed-off-by: Raul Sanchez-Mateos <[email protected]>

* Fix doxygen description

Signed-off-by: Raul Sanchez-Mateos <[email protected]>

---------

Signed-off-by: Raul Sanchez-Mateos <[email protected]>

Author: rsanchez15

include/fastdds_statistics_backend/StatisticsBackend.hpp

@@ -203,6 +203,17 @@ class StatisticsBackend
             EntityKind entity_type,
             EntityId entity_id = EntityId::all());
 
+    /**
+     * @brief Get the EntityId for a given GUID in string format.
+     *
+     * @param guid The GUID in string format.
+     * @return The EntityId corresponding to the given GUID.
+     * @throws eprosima::statistics_backend::BadParameter if the GUID is not found.
+     */
+    FASTDDS_STATISTICS_BACKEND_DllAPI
+    static EntityId get_entity_by_guid(
+            const std::string& guid);
+
     /**
      * @brief Returns whether the entity is active.
      *
@@ -612,6 +623,14 @@ class StatisticsBackend
     FASTDDS_STATISTICS_BACKEND_DllAPI
     static std::string deserialize_guid(
             fastdds::statistics::detail::GUID_s data);
+
+    /**
+     * @brief Serialize entity guid from string.
+     * @param guid_str Entity guid.
+     */
+    FASTDDS_STATISTICS_BACKEND_DllAPI
+    static fastdds::statistics::detail::GUID_s serialize_guid(
+            const std::string& guid_str);
 };
 
 } // namespace statistics_backend

src/cpp/StatisticsBackend.cpp

@@ -508,6 +508,15 @@ std::vector<EntityId> StatisticsBackend::get_entities(
     return StatisticsBackendData::get_instance()->database_->get_entity_ids(entity_type, entity_id);
 }
 
+EntityId StatisticsBackend::get_entity_by_guid(
+        const std::string& guid)
+{
+    return StatisticsBackendData::get_instance()->database_->get_entity_by_guid(
+        StatisticsBackendData::get_instance()->database_->get_entity_kind_by_guid(
+            StatisticsBackend::serialize_guid(guid)),
+        guid).second;
+}
+
 bool StatisticsBackend::is_active(
         EntityId entity_id)
 {
@@ -994,5 +1003,37 @@ std::string StatisticsBackend::deserialize_guid(
     return ss.str();
 }
 
+fastdds::statistics::detail::GUID_s StatisticsBackend::serialize_guid(
+        const std::string& guid_str)
+{
+    fastdds::statistics::detail::GUID_s guid_s;
+    std::istringstream iss(guid_str);
+    std::string byte_str;
+
+    // Parse the guidPrefix part
+    uint8_t guid_prefix_size = static_cast<uint8_t>(fastdds::rtps::GuidPrefix_t::size);
+    for (uint8_t i = 0; i < guid_prefix_size; ++i)
+    {
+        if (i == (guid_prefix_size - 1))
+        {
+            std::getline(iss, byte_str, '|');
+        }
+        else
+        {
+            std::getline(iss, byte_str, '.');
+        }
+        guid_s.guidPrefix().value()[i] = static_cast<uint8_t>(std::stoul(byte_str, nullptr, 16));
+    }
+
+    // Parse the entityId part
+    for (uint8_t i = 0; i < static_cast<uint8_t>(fastdds::rtps::EntityId_t::size); ++i)
+    {
+        std::getline(iss, byte_str, '.');
+        guid_s.entityId().value()[i] = static_cast<uint8_t>(std::stoul(byte_str, nullptr, 16));
+    }
+
+    return guid_s;
+}
+
 } // namespace statistics_backend
 } // namespace eprosima