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Userland: Introduce ConfigServer and LibConfig

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ConfigServer is an IPC service that provides access to application
configuration and settings. The idea is to replace all uses of
Core::ConfigFile with IPC requests to ConfigServer.

This first cut of the API is pretty similar to Core::ConfigFile.

The old:

    auto config = Core::ConfigFile::open_for_app("App");
    auto value = config->read_entry("Group", "Key");

The new:

    auto value = Config::read_string("App", "Group", "Key");

ConfigServer uses the ~/.config directory as its backing store
and all the files remain human-editable. :^)
This commit is contained in:
Andreas Kling 2021-08-25 19:35:19 +02:00
parent c97f7ea23b
commit bdcd0abf9d
12 changed files with 319 additions and 0 deletions
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43
Userland/Services/ConfigServer/main.cpp Normal file
View file

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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "ClientConnection.h"
#include <LibCore/LocalServer.h>
#include <LibCore/StandardPaths.h>
#include <unistd.h>
int main(int, char**)
{
if (pledge("stdio accept rpath wpath cpath", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil(Core::StandardPaths::config_directory().characters(), "rwc") < 0) {
perror("unveil");
return 1;
}
unveil(nullptr, nullptr);
Core::EventLoop event_loop;
auto server = Core::LocalServer::construct();
bool ok = server->take_over_from_system_server();
VERIFY(ok);
server->on_ready_to_accept = [&] {
auto client_socket = server->accept();
if (!client_socket) {
dbgln("ConfigServer: accept failed.");
return;
}
static int s_next_client_id = 0;
int client_id = ++s_next_client_id;
IPC::new_client_connection<ConfigServer::ClientConnection>(client_socket.release_nonnull(), client_id);
};
return event_loop.exec();
}