Implement bazaar item identity and offline trading rework

common/repositories/item_unique_id_reservations_repository.h

@@ -0,0 +1,68 @@
+#pragma once
+
+#include "common/database.h"
+#include "common/strings.h"
+#include "common/item_instance.h"
+
+class ItemUniqueIdReservationsRepository {
+public:
+	static bool Reserve(Database &db, const std::string &item_unique_id)
+	{
+		if (item_unique_id.empty()) {
+			return false;
+		}
+
+		auto results = db.QueryDatabase(
+			fmt::format(
+				"INSERT IGNORE INTO item_unique_id_reservations (item_unique_id, reserved_at) VALUES ('{}', NOW())",
+				Strings::Escape(item_unique_id)
+			)
+		);
+
+		return results.Success();
+	}
+
+	static std::string ReserveNew(Database &db, uint32 max_attempts = 64)
+	{
+		for (uint32 attempt = 0; attempt < max_attempts; ++attempt) {
+			auto candidate = EQ::UniqueHashGenerator::generate();
+			auto results   = db.QueryDatabase(
+				fmt::format(
+					"INSERT INTO item_unique_id_reservations (item_unique_id, reserved_at) VALUES ('{}', NOW())",
+					Strings::Escape(candidate)
+				)
+			);
+
+			if (results.Success()) {
+				return candidate;
+			}
+
+			if (results.ErrorNumber() != 1062) {
+				LogError(
+					"Failed reserving item_unique_id [{}] (attempt {}): ({}) {}",
+					candidate,
+					attempt + 1,
+					results.ErrorNumber(),
+					results.ErrorMessage()
+				);
+				break;
+			}
+		}
+
+		return {};
+	}
+
+	static bool PopulateFromTable(Database &db, const std::string &table_name, const std::string &column_name)
+	{
+		auto results = db.QueryDatabase(
+			fmt::format(
+				"INSERT IGNORE INTO item_unique_id_reservations (item_unique_id, reserved_at) "
+				"SELECT DISTINCT {1}, NOW() FROM {0} WHERE {1} IS NOT NULL AND {1} <> ''",
+				table_name,
+				column_name
+			)
+		);
+
+		return results.Success();
+	}
+};