Instance: use std::unique_ptr<> to manage the Database pointer

src/Instance.cxx

@@ -58,7 +58,7 @@ Instance::~Instance() noexcept
 
 	if (database != nullptr) {
 		database->Close();
-		delete database;
+		database.reset();
 	}
 
 	delete storage;

src/Instance.hxx

@@ -41,7 +41,7 @@ class NeighborGlue;
 
 #ifdef ENABLE_DATABASE
 #include "db/DatabaseListener.hxx"
-class Database;
+#include "db/Ptr.hxx"
 class Storage;
 class UpdateService;
 #endif
@@ -104,7 +104,7 @@ struct Instance final
 #endif
 
 #ifdef ENABLE_DATABASE
-	Database *database;
+	DatabasePtr database;
 
 	/**
 	 * This is really a #CompositeStorage.  To avoid heavy include
@@ -155,7 +155,7 @@ struct Instance final
 	 * music_directory was configured).
 	 */
 	Database *GetDatabase() {
-		return database;
+		return database.get();
 	}
 
 	/**

src/Main.cxx

@@ -188,7 +188,7 @@ glue_db_init_and_load(const ConfigData &config)
 	instance->database =
 		CreateConfiguredDatabase(config, instance->event_loop,
 					 instance->io_thread.GetEventLoop(),
-					 *instance).release();
+					 *instance);
 	if (instance->database == nullptr)
 		return true;
 
@@ -196,8 +196,7 @@ glue_db_init_and_load(const ConfigData &config)
 		InitStorage(config, instance->io_thread.GetEventLoop());
 
 		if (instance->storage == nullptr) {
-			delete instance->database;
-			instance->database = nullptr;
+			instance->database.reset();
 			LogDefault(config_domain,
 				   "Found database setting without "
 				   "music_directory - disabling database");
@@ -216,7 +215,7 @@ glue_db_init_and_load(const ConfigData &config)
 		std::throw_with_nested(std::runtime_error("Failed to open database plugin"));
 	}
 
-	auto *db = dynamic_cast<SimpleDatabase *>(instance->database);
+	auto *db = dynamic_cast<SimpleDatabase *>(instance->database.get());
 	if (db == nullptr)
 		return true;
 

src/StateFile.cxx

@@ -119,7 +119,7 @@ try {
 	TextFile file(config.path);
 
 #ifdef ENABLE_DATABASE
-	const SongLoader song_loader(partition.instance.database,
+	const SongLoader song_loader(partition.instance.GetDatabase(),
 				     partition.instance.storage);
 #else
 	const SongLoader song_loader(nullptr, nullptr);

src/Stats.cxx

@@ -124,7 +124,7 @@ stats_print(Response &r, const Partition &partition)
 		 std::lround(partition.pc.GetTotalPlayTime().count()));
 
 #ifdef ENABLE_DATABASE
-	const Database *db = partition.instance.database;
+	const Database *db = partition.instance.GetDatabase();
 	if (db != nullptr)
 		db_stats_print(r, *db);
 #endif

src/command/OtherCommands.cxx

@@ -294,7 +294,7 @@ handle_update(Client &client, Request args, Response &r, bool discard)
 	if (update != nullptr)
 		return handle_update(r, *update, path, discard);
 
-	Database *db = client.GetInstance().database;
+	Database *db = client.GetInstance().GetDatabase();
 	if (db != nullptr)
 		return handle_update(r, *db, path, discard);
 #else

src/command/StorageCommands.cxx

@@ -209,7 +209,7 @@ handle_mount(Client &client, Request args, Response &r)
 	instance.EmitIdle(IDLE_MOUNT);
 
 #ifdef ENABLE_DATABASE
-	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.database)) {
+	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.GetDatabase())) {
 		try {
 			db->Mount(local_uri, remote_uri);
 		} catch (...) {
@@ -253,7 +253,7 @@ handle_unmount(Client &client, Request args, Response &r)
 		   destroy here */
 		instance.update->CancelMount(local_uri);
 
-	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.database)) {
+	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.GetDatabase())) {
 		if (db->Unmount(local_uri))
 			// TODO: call Instance::OnDatabaseModified()?
 			instance.EmitIdle(IDLE_DATABASE);

src/storage/StorageState.cxx

@@ -106,7 +106,7 @@ storage_state_restore(const char *line, TextFile &file, Instance &instance)
 		return true;
 	}
 
-	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.database)) {
+	if (auto *db = dynamic_cast<SimpleDatabase *>(instance.GetDatabase())) {
 		try {
 			db->Mount(uri.c_str(), url.c_str());
 		} catch (...) {