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src/daemonclient.h

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+// gKeyMapper - talk to gkeymapper-daemon over the session bus.
+#ifndef GKEYMAPPER_DAEMONCLIENT_H
+#define GKEYMAPPER_DAEMONCLIENT_H
+
+#include <gio/gio.h>
+
+#include <functional>
+#include <string>
+
+namespace gkeymapper {
+
+// What the footer needs to know about the daemon.
+struct DaemonStatus {
+    bool reachable = false;
+    std::string version;
+    std::string device;
+    std::string configPath;
+};
+
+// Control-plane client for the daemon. Every call is asynchronous and its
+// result arrives on the GTK main loop, so the UI never blocks on the daemon
+// (a call is answered at most one daemon loop iteration late). Keypresses never
+// travel through here.
+class DaemonClient {
+public:
+    using StatusFn = std::function<void(const DaemonStatus&)>;
+    using KeyFn = std::function<void(int index, const std::string& action)>;
+
+    DaemonClient() = default;
+    ~DaemonClient();
+
+    DaemonClient(const DaemonClient&) = delete;
+    DaemonClient& operator=(const DaemonClient&) = delete;
+
+    void init(StatusFn onStatus, KeyFn onKey);
+
+    // Best effort: asks the daemon to re-read the mappings file. Its file watch
+    // would pick the save up by itself, this only makes it immediate.
+    void reload();
+
+private:
+    static void on_bus_ready(GObject* source, GAsyncResult* result, gpointer userData);
+    static void on_daemon_signal(GDBusConnection* connection, const gchar* sender,
+                                 const gchar* objectPath, const gchar* interfaceName,
+                                 const gchar* signalName, GVariant* parameters,
+                                 gpointer userData);
+    static void on_name_owner_changed(GDBusConnection* connection, const gchar* sender,
+                                      const gchar* objectPath, const gchar* interfaceName,
+                                      const gchar* signalName, GVariant* parameters,
+                                      gpointer userData);
+    static void on_status_reply(GObject* source, GAsyncResult* result, gpointer userData);
+    static void on_reload_reply(GObject* source, GAsyncResult* result, gpointer userData);
+
+    void watch_signals();
+    void fetch_status();
+    void report_unreachable();
+    void publish(const DaemonStatus& status);
+
+    GDBusConnection* connection_ = nullptr;
+    guint signal_subscription_ = 0;
+    guint name_subscription_ = 0;
+    bool started_ = false;
+    StatusFn onStatus_;
+    KeyFn onKey_;
+};
+
+} // namespace gkeymapper
+
+#endif // GKEYMAPPER_DAEMONCLIENT_H