serialized: don't copy strings in policy lookups

Direct serialization allows more optimizing. Now, that other
backends are gone, we can slightly modify the interface.

This commit makes send index searching pass boost::string_ref
to the backend instead of copied C-string. The backend interface
is modified to accept string_ref. This way we can remove
string copying which was necessary for having null-terminated C-string.

Change-Id: I5a1f9657efd050d93023b5256f13afd6d150c369

2 files changed, 2 insertions, 7 deletions

diff --git a/src/internal/storage_backend_direct.hpp b/src/internal/storage_backend_direct.hpp
index 7afb1f7..022c8d5 100644
--- a/src/internal/storage_backend_direct.hpp
+++ b/src/internal/storage_backend_direct.hpp
@@ -508,7 +508,7 @@ public:
 			                        [](const auto *elem) { return static_cast<id_t>(elem->getId()); });
 	}
 
-	auto containerLookupByKey(const List<NameScoresPair> *container, const char *key) const {
+	auto containerLookupByKey(const List<NameScoresPair> *container, boost::string_ref key) const {
 		return containerLookupByKey(container, key,
 			                        [](const auto *elem) { return elem->getName()->toStringRef(); });
 	}
diff --git a/src/internal/storage_backend_serialized.cpp b/src/internal/storage_backend_serialized.cpp
index 53d76dc..5509e55 100644
--- a/src/internal/storage_backend_serialized.cpp
+++ b/src/internal/storage_backend_serialized.cpp
@@ -209,16 +209,11 @@ inline ldp_xml_parser::DecisionItem StorageBackendSerialized::getDecisionItem(co
 	};
 
 	auto searchAndUpdateCurrentBest = [&currentBest, &index, &updateCurrentBest, this](boost::string_ref name_ref) {
-		// we need to create C-string for the lookups
-		// boost::string_ref gives us correct start, but possibly NUL-terminated in a wrong place, as it does not modify
-		// input string and keeps only the length
-		std::string name(name_ref.data(), name_ref.size());
-
 		if (impl.containerEmpty(index))
 			return;
 
 		// check if there are any rules for the name
-		auto fit = impl.containerLookupByKey(index, name.c_str());
+		auto fit = impl.containerLookupByKey(index, name_ref);
 		if (!fit.first)
 			return;