lib: xapian-db/config: more tests

...and xapian-db gets a small API update, update store as well.

lib/meson.build

@@ -157,4 +157,11 @@ test('test-scanner',
                 dependencies: [glib_dep, config_h_dep,
                                lib_mu_utils_dep]))
 
+test('test-xapian-db',
+     executable('test-xapian-db', 'mu-xapian-db.cc',
+                install: false,
+                cpp_args: ['-DBUILD_TESTS'],
+                dependencies: [lib_mu_dep, config_h_dep]))
+
+
 subdir('tests')

lib/mu-config.cc

@@ -77,6 +77,29 @@ test_basic()
 		const auto rmd = conf_db.get<Id::RootMaildir>();
 		assert_equal(rmd, "/home/djcb/Maildir");
 	}
+
+	{
+		g_assert_true(Config::property<Id::BatchSize>().default_val == "50000");
+		g_assert_cmpuint(conf_db.get<Id::BatchSize>(),==,50000);
+
+		assert_valid_result(conf_db.set<Id::BatchSize>(123456));
+		g_assert_cmpuint(conf_db.get<Id::BatchSize>(),==,123456);
+	}
+
+
+	{
+		MemDb db2;
+		Config conf_db2{db2};
+
+		g_assert_cmpuint(conf_db2.get<Id::BatchSize>(),==,50000);
+		g_assert_true(conf_db2.get<Id::RootMaildir>().empty());
+
+		// BatchSize is configurable; RootMaildir is not.
+		conf_db2.import_configurable(conf_db);
+
+		g_assert_cmpuint(conf_db2.get<Id::BatchSize>(),==,123456);
+		g_assert_true(conf_db2.get<Id::RootMaildir>().empty());
+	}
 }
 
 static void

lib/mu-store.cc

@@ -165,29 +165,30 @@ struct Store::Private {
 Result<Store::Id>
 Store::Private::add_message_unlocked(Message& msg)
 {
-	auto docid{xapian_db_.add_document(msg.document().xapian_document())};
-	mu_debug("added message @ {}; docid = {}", msg.path(), docid);
+	auto&& docid{xapian_db_.add_document(msg.document().xapian_document())};
+	if (docid)
+		mu_debug("added message @ {}; docid = {}", msg.path(), *docid);
 
-	return Ok(std::move(docid));
+	return docid;
 }
 
 
 Result<Store::Id>
 Store::Private::update_message_unlocked(Message& msg, Store::Id docid)
 {
-	xapian_db_.replace_document(docid, msg.document().xapian_document());
-	mu_debug("updated message @ {}; docid = {}", msg.path(), docid);
+	auto&& res{xapian_db_.replace_document(docid, msg.document().xapian_document())};
+	if (res)
+		mu_debug("updated message @ {}; docid = {}", msg.path(), *res);
 
-	return Ok(std::move(docid));
+	return res;
 }
 
 Result<Store::Id>
 Store::Private::update_message_unlocked(Message& msg, const std::string& path_to_replace)
 {
-	auto id = xapian_db_.replace_document(
+	return xapian_db_.replace_document(
 		field_from_id(Field::Id::Path).xapian_term(path_to_replace),
 		msg.document().xapian_document());
-	return Ok(std::move(id));
 }
 
 Option<Message>

lib/mu-xapian-db.cc

@@ -90,8 +90,10 @@ make_db(const std::string& db_path, Flavor flavor)
 		return Xapian::WritableDatabase(db_path, Xapian::DB_OPEN);
 	case Flavor::CreateOverwrite:
 		return Xapian::WritableDatabase(db_path, Xapian::DB_CREATE_OR_OVERWRITE);
+		/* LCOV_EXCL_START*/
 	default:
 		throw std::logic_error("unknown flavor");
+		/* LCOV_EXCL_STOP*/
 	}
 }
 
@@ -104,3 +106,43 @@ XapianDb::XapianDb(const std::string& db_path, Flavor flavor) :
 
 	mu_debug("created {} / {}", flavor, *this);
 }
+
+
+
+
+#ifdef BUILD_TESTS
+/*
+ * Tests.
+ *
+ */
+
+#include "utils/mu-test-utils.hh"
+#include "config.h"
+#include "mu-store.hh"
+
+static void
+test_errors()
+{
+	allow_warnings();
+
+	TempDir tdir;
+	auto store = Store::make_new(tdir.path(), MU_TESTMAILDIR2);
+	assert_valid_result(store);
+	g_assert_true(store->empty());
+
+	XapianDb xdb(tdir.path(), Flavor::ReadOnly);
+	g_assert_true(xdb.read_only());
+
+	g_assert_false(!!xdb.delete_document("Boo"));
+}
+
+int
+main(int argc, char* argv[])
+{
+	mu_test_init(&argc, &argv);
+
+	g_test_add_func("/xapian-db/errors", test_errors);
+
+	return g_test_run();
+}
+#endif /*BUILD_TESTS*/

lib/mu-xapian-db.hh

@@ -307,13 +307,13 @@ public:
 	 *
 	 * @return new docid or 0
 	 */
-	Xapian::docid add_document(const Xapian::Document& doc) {
-		return xapian_try([&]{
+	Result<Xapian::docid> add_document(const Xapian::Document& doc) {
+		return xapian_try_result([&]{
 			DB_LOCKED;
-			auto&& id= wdb().add_document(doc);
+			auto&& id{wdb().add_document(doc)};
 			set_timestamp(MetadataIface::last_change_key);
-			return id;
-		}, 0);
+			return Ok(std::move(id));
+		});
 	}
 
 	/**
@@ -323,21 +323,24 @@ public:
 	 * @param id docid
 	 * @param doc replacement document
 	 *
-	 * @return new docid or 0
+	 * @return new docid or an error
 	 */
-	Xapian::docid replace_document(const std::string& term, const Xapian::Document& doc) {
-		return xapian_try([&]{
+	Result<Xapian::docid>
+	replace_document(const std::string& term, const Xapian::Document& doc) {
+		return xapian_try_result([&]{
 			DB_LOCKED;
-			auto&& id= wdb().replace_document(term, doc);
+			auto&& id{wdb().replace_document(term, doc)};
 			set_timestamp(MetadataIface::last_change_key);
-			return id;
-		}, 0);
+			return Ok(std::move(id));
+		});
 	}
-	void replace_document(const Xapian::docid id, const Xapian::Document& doc) {
-		xapian_try([&]{
+	Result<Xapian::docid>
+	replace_document(Xapian::docid id, const Xapian::Document& doc) {
+		return xapian_try_result([&]{
 			DB_LOCKED;
 			wdb().replace_document(id, doc);
 			set_timestamp(MetadataIface::last_change_key);
+			return Ok(std::move(id));
 		});
 	}
 
@@ -345,20 +348,23 @@ public:
 	 * Delete document(s) for the given term or id
 	 *
 	 * @param term a term
+	 *
+	 * @return Ok or Error
 	 */
-	void delete_document(const std::string& term) {
-		xapian_try([&]{
+	Result<void> delete_document(const std::string& term) {
+		return xapian_try_result([&]{
 			DB_LOCKED;
 			wdb().delete_document(term);
 			set_timestamp(MetadataIface::last_change_key);
+			return Ok();
 		});
 	}
-
-	void delete_document(Xapian::docid id) {
-		xapian_try([&]{
+	Result<void> delete_document(Xapian::docid id) {
+		return xapian_try_result([&]{
 			DB_LOCKED;
 			wdb().delete_document(id);
 			set_timestamp(MetadataIface::last_change_key);
+			return Ok();
 		});
 	}
 
@@ -382,15 +388,26 @@ public:
 	 * Start a transaction
 	 *
 	 * @param flushed
+	 *
+	 * @return Ok or Error
 	 */
-	void begin_transaction(bool flushed=true) {
-		xapian_try([&]{ DB_LOCKED; return wdb().begin_transaction(flushed);});
+	Result<void> begin_transaction(bool flushed=true) {
+		return xapian_try_result([&]{
+			DB_LOCKED;
+			wdb().begin_transaction(flushed);
+			return Ok();
+		});
 	}
 	/**
 	 * Commit a transaction
-	 */
-	void commit_transaction() {
-		xapian_try([&]{ DB_LOCKED; return wdb().commit_transaction();});
+	 *
+	 * @return Ok or Error*/
+	Result<void> commit_transaction() {
+		return xapian_try_result([&]{
+			DB_LOCKED;
+			wdb().commit_transaction();
+			return Ok();
+		});
 	}
 
 	using DbType = std::variant<Xapian::Database, Xapian::WritableDatabase>;