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LibCore: Create ConfigFiles with an already-open File

Browse source 
This moves the fallible action of opening the file, from the
constructor, into the factory methods which can propagate any errors.

The wrinkle here is that failure to open a ConfigFile in read-only mode
is allowed (and expected, since the file may not exist), and treated as
if an empty file was successfully opened.
This commit is contained in:
Sam Atkins 2022-02-06 13:58:29 +00:00 • committed by Tim Flynn
parent 8260135d4d
commit b90dc408bd
2 changed files with 17 additions and 22 deletions
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36
Userland/Libraries/LibCore/ConfigFile.cpp
View file

@ -18,48 +18,44 @@ ErrorOr<NonnullRefPtr<ConfigFile>> ConfigFile::open_for_lib(String const& lib_na
{
String directory = StandardPaths::config_directory();
auto path = String::formatted("{}/lib/{}.ini", directory, lib_name);
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(path, allow_altering));
return ConfigFile::open(path, allow_altering);
}
ErrorOr<NonnullRefPtr<ConfigFile>> ConfigFile::open_for_app(String const& app_name, AllowWriting allow_altering)
{
String directory = StandardPaths::config_directory();
auto path = String::formatted("{}/{}.ini", directory, app_name);
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(path, allow_altering));
return ConfigFile::open(path, allow_altering);
}
ErrorOr<NonnullRefPtr<ConfigFile>> ConfigFile::open_for_system(String const& app_name, AllowWriting allow_altering)
{
auto path = String::formatted("/etc/{}.ini", app_name);
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(path, allow_altering));
return ConfigFile::open(path, allow_altering);
}
ErrorOr<NonnullRefPtr<ConfigFile>> ConfigFile::open(String const& filename, AllowWriting allow_altering)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(filename, allow_altering));
auto file = File::construct(filename);
if (!file->open(allow_altering == AllowWriting::Yes ? OpenMode::ReadWrite : OpenMode::ReadOnly)) {
// Failure to open a read-only file is OK, and behaves as if the file was empty.
if (allow_altering == AllowWriting::Yes)
return Error::from_string_literal("Unable to open config file");
}
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(filename, move(file)));
}
ErrorOr<NonnullRefPtr<ConfigFile>> ConfigFile::open(String const& filename, int fd)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(filename, fd));
auto file = File::construct(filename);
if (!file->open(fd, OpenMode::ReadWrite, File::ShouldCloseFileDescriptor::Yes))
return Error::from_string_literal("Unable to open config file");
return adopt_nonnull_ref_or_enomem(new (nothrow) ConfigFile(filename, move(file)));
}
ConfigFile::ConfigFile(String const& filename, AllowWriting allow_altering)
: m_file(File::construct(filename))
ConfigFile::ConfigFile(String const&, NonnullRefPtr<File> open_file)
: m_file(move(open_file))
{
if (!m_file->open(allow_altering == AllowWriting::Yes ? OpenMode::ReadWrite : OpenMode::ReadOnly))
return;
reparse();
}
ConfigFile::ConfigFile(String const& filename, int fd)
: m_file(File::construct(filename))
{
if (!m_file->open(fd, OpenMode::ReadWrite, File::ShouldCloseFileDescriptor::Yes))
return;
reparse();
}