[sysprof] libsysprof-ui: add helper to check for sysprof-3 support

[Christian Hergert <chergert src gnome org>]

commit 37960fc0c7fad5ecd5cd78d8c39d9634a94d6c0b
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 13 17:37:59 2019 -0700

    libsysprof-ui: add helper to check for sysprof-3 support

 src/libsysprof-ui/meson.build     |   2 +
 src/libsysprof-ui/sysprof-check.c | 106 ++++++++++++++++++++++++++++++++++++++
 src/libsysprof-ui/sysprof-check.h |  37 +++++++++++++
 src/libsysprof-ui/sysprof-ui.h    |   1 +
 4 files changed, 146 insertions(+)
---
diff --git a/src/libsysprof-ui/meson.build b/src/libsysprof-ui/meson.build
index da811e9..5a919ac 100644
--- a/src/libsysprof-ui/meson.build
+++ b/src/libsysprof-ui/meson.build
@@ -5,6 +5,7 @@ libsysprof_ui_public_sources = [
   'sysprof-capture-view.c',
   'sysprof-callgraph-aid.c',
   'sysprof-callgraph-view.c',
+  'sysprof-check.c',
   'sysprof-color-cycle.c',
   'sysprof-cpu-aid.c',
   'sysprof-cpu-visualizer-row.c',
@@ -56,6 +57,7 @@ libsysprof_ui_public_headers = [
   'sysprof-callgraph-aid.h',
   'sysprof-callgraph-view.h',
   'sysprof-cell-renderer-percent.h',
+  'sysprof-check.h',
   'sysprof-cpu-aid.h',
   'sysprof-cpu-visualizer-row.h',
   'sysprof-display.h',
diff --git a/src/libsysprof-ui/sysprof-check.c b/src/libsysprof-ui/sysprof-check.c
new file mode 100644
index 0000000..d702579
--- /dev/null
+++ b/src/libsysprof-ui/sysprof-check.c
@@ -0,0 +1,106 @@
+/* sysprof-check.c
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define G_LOG_DOMAIN "sysprof-check"
+
+#include "config.h"
+
+#include "sysprof-check.h"
+
+static void
+sysprof_check_supported_ping_cb (GObject      *object,
+                                 GAsyncResult *result,
+                                 gpointer      user_data)
+{
+  GDBusConnection *bus = (GDBusConnection *)object;
+  g_autoptr(GVariant) reply = NULL;
+  g_autoptr(GError) error = NULL;
+  g_autoptr(GTask) task = user_data;
+
+  g_assert (G_IS_DBUS_CONNECTION (bus));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (G_IS_TASK (task));
+
+  if (!(reply = g_dbus_connection_call_finish (bus, result, &error)))
+    g_task_return_error (task, g_steal_pointer (&error));
+  else
+    g_task_return_boolean (task, TRUE);
+}
+
+static void
+sysprof_check_supported_bus_cb (GObject      *object,
+                                GAsyncResult *result,
+                                gpointer      user_data)
+{
+  g_autoptr(GDBusConnection) bus = NULL;
+  g_autoptr(GError) error = NULL;
+  g_autoptr(GTask) task = user_data;
+
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (G_IS_TASK (task));
+
+  if (!(bus = g_bus_get_finish (result, &error)))
+    g_task_return_error (task, g_steal_pointer (&error));
+  else
+    g_dbus_connection_call (bus,
+                            "org.gnome.Sysprof3",
+                            "/org/gnome/Sysprof3",
+                            "org.freedesktop.DBus.Peer",
+                            "Ping",
+                            g_variant_new ("()"),
+                            NULL,
+                            G_DBUS_CALL_FLAGS_NONE,
+                            -1,
+                            g_task_get_cancellable (task),
+                            sysprof_check_supported_ping_cb,
+                            g_object_ref (task));
+}
+
+void
+sysprof_check_supported_async (GCancellable        *cancellable,
+                               GAsyncReadyCallback  callback,
+                               gpointer             user_data)
+{
+  g_autoptr(GTask) task = NULL;
+
+  g_return_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable));
+
+  task = g_task_new (NULL, cancellable, callback, user_data);
+  g_task_set_source_tag (task, sysprof_check_supported_async);
+
+  /* Get access to the System D-Bus and check to see if we can ping the
+   * service that is found at org.gnome.Sysprof3.
+   */
+
+  g_bus_get (G_BUS_TYPE_SYSTEM,
+             cancellable,
+             sysprof_check_supported_bus_cb,
+             g_steal_pointer (&task));
+
+}
+
+gboolean
+sysprof_check_supported_finish (GAsyncResult  *result,
+                                GError       **error)
+{
+  g_return_val_if_fail (G_IS_TASK (result), FALSE);
+
+  return g_task_propagate_boolean (G_TASK (result), error);
+}
diff --git a/src/libsysprof-ui/sysprof-check.h b/src/libsysprof-ui/sysprof-check.h
new file mode 100644
index 0000000..bb8f4e7
--- /dev/null
+++ b/src/libsysprof-ui/sysprof-check.h
@@ -0,0 +1,37 @@
+/* sysprof-check.h
+ *
+ * Copyright 2019 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <gio/gio.h>
+
+#include "sysprof-version-macros.h"
+
+G_BEGIN_DECLS
+
+SYSPROF_AVAILABLE_IN_ALL
+void     sysprof_check_supported_async  (GCancellable         *cancellable,
+                                         GAsyncReadyCallback   callback,
+                                         gpointer              user_data);
+SYSPROF_AVAILABLE_IN_ALL
+gboolean sysprof_check_supported_finish (GAsyncResult         *result,
+                                         GError              **error);
+
+G_END_DECLS
diff --git a/src/libsysprof-ui/sysprof-ui.h b/src/libsysprof-ui/sysprof-ui.h
index 49d9786..4f020d5 100644
--- a/src/libsysprof-ui/sysprof-ui.h
+++ b/src/libsysprof-ui/sysprof-ui.h
@@ -32,6 +32,7 @@ G_BEGIN_DECLS
 # include "sysprof-capture-view.h"
 # include "sysprof-callgraph-aid.h"
 # include "sysprof-cell-renderer-percent.h"
+# include "sysprof-check.h"
 # include "sysprof-cpu-aid.h"
 # include "sysprof-cpu-visualizer-row.h"
 # include "sysprof-display.h"