Add gRPC API implementation

Changes:
- Rename the existing daemon to applaunchd-dbus, and add a new
  version that exposes a gRPC based implementation of the API based
  on the protobuf definition added in a top-level protos directory.
  Having both the D-Bus and gRPC APIs exposed by a single daemon was
  posing difficulties around startup dependencies stemming from D-Bus
  activation of the daemon.  Since the end goal is dropping the D-Bus
  API entirely, it is easier to just add a second daemon for gRPC that
  will eventually be the only one present.
- To facilitate building the two implementations, a significant amount
  of code refactoring has been done to move things from the D-Bus API
  implementing app_launcher.[ch] to systemd_manager.[ch] so the code
  can be reused.
- All use of the systemd D-Bus library except for the path encoding
  helper function has been replaced with GDBus.  The systemd interface
  wrapper code was generated with gdbus-codegen from XML files captured
  via introspection on a running system.  The motivation for this
  change was to avoid multithreading issues with sd_bus exposed when
  calling into it from the gRPC threads.
- The copyright headers in the source files have been tweaked to
  remove the Apache license boilerplate in favour of a SPDX license
  tag.

Notes:
- The gRPC API differs slightly from the D-Bus one in that it has a
  single status streaming RPC method as opposed to the separate signals
  for application started or terminated that the D-Bus API has.
- The gRPC API is currently unauthenticated, the aim is to circle back
  and implement authentication once a consensus can be reached on what
  mechanism should be used (fixed JWT configuration, OAuth, etc.).

Bug-AGL: SPEC-4559

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I828f38a58b60e9959162b98054982124d4fa4380

1 files changed, 12 insertions, 21 deletions

diff --git a/src/systemd_manager.h b/src/systemd_manager.h
index b866948..b4c505a 100644
--- a/src/systemd_manager.h
+++ b/src/systemd_manager.h
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
 /*
  * Copyright (C) 2022 Konsulko Group
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
  */
 
 #ifndef SYSTEMDMANAGER_H
@@ -20,7 +9,6 @@
 #include <glib-object.h>
 
 #include "app_info.h"
-#include "app_launcher.h"
 
 G_BEGIN_DECLS
 
@@ -29,20 +17,23 @@ G_BEGIN_DECLS
 G_DECLARE_FINAL_TYPE(SystemdManager, systemd_manager,
                      APPLAUNCHD, SYSTEMD_MANAGER, GObject);
 
-SystemdManager *systemd_manager_new(void);
+SystemdManager *systemd_manager_get_default(void);
 
-gboolean systemd_manager_enumerate_app_units(SystemdManager *self,
-                                             AppLauncher *launcher,
-                                             GList **units);
+void systemd_manager_connect_callbacks(SystemdManager *self,
+                                       GCallback started_cb,
+                                       GCallback terminated_cb,
+                                       void *data);
 
-gboolean systemd_manager_get_app_description(SystemdManager *self,
-					     AppLauncher *launcher,
-					     gchar *service,
-					     gchar **description);
+AppInfo *systemd_manager_get_app_info(SystemdManager *self,
+                                      const gchar *app_id);
+
+GList *systemd_manager_get_app_list(SystemdManager *self);
 
 gboolean systemd_manager_start_app(SystemdManager *self,
                                    AppInfo *app_info);
 
 G_END_DECLS
 
+void systemd_manager_free_runtime_data(gpointer data);
+
 #endif