Present verify results with a signal

examples/demo.c

@@ -179,26 +179,33 @@ static guint32 find_finger(DBusGProxy *dev)
 	return print_id;
 }
 
-static int do_verify(DBusGProxy *dev, guint32 print_id)
+static void verify_result(GObject *object, int result, void *user_data)
+{
+	gboolean *verify_completed = user_data;
+	g_print("Verify result: %s (%d)\n", verify_result_str(result), result);
+	if (result == VERIFY_NO_MATCH || result == VERIFY_MATCH)
+		*verify_completed = TRUE;
+}
+
+static void do_verify(DBusGProxy *dev, guint32 print_id)
 {
 	GError *error;
-	gboolean more_results;
-	int result;
+	gboolean verify_completed = FALSE;
+
+	dbus_g_proxy_add_signal(dev, "VerifyResult", G_TYPE_INT, NULL);
+	dbus_g_proxy_connect_signal(dev, "VerifyResult", G_CALLBACK(verify_result),
+		&verify_completed, NULL);
 
 	if (!net_reactivated_Fprint_Device_verify_start(dev, print_id, &error))
 		g_error("VerifyStart failed: %s", error->message);
 
-	do {
-		if (!net_reactivated_Fprint_Device_get_verify_result(dev, &result, &more_results, &error))
-			g_error("GetVerifyResult failed: %s", error->message);
+	while (!verify_completed)
+		g_main_context_iteration(NULL, TRUE);
 
-		g_print("Verify result: %s (%d)\n", verify_result_str(result), result);
-	} while (result != VERIFY_NO_MATCH && result != VERIFY_MATCH);
+	dbus_g_proxy_disconnect_signal(dev, "VerifyResult", G_CALLBACK(verify_result), &verify_completed);
 
 	if (!net_reactivated_Fprint_Device_verify_stop(dev, &error))
 		g_error("VerifyStop failed: %s", error->message);
-
-	return result;
 }
 
 static void unload_print(DBusGProxy *dev, guint32 print_id)
@@ -220,7 +227,6 @@ int main(int argc, char **argv)
 	GMainLoop *loop;
 	DBusGProxy *dev;
 	guint32 print_id;
-	int verify_result;
 
 	g_type_init();
 	loop = g_main_loop_new(NULL, FALSE);
@@ -228,7 +234,7 @@ int main(int argc, char **argv)
 
 	dev = open_device();
 	print_id = find_finger(dev);
-	verify_result = do_verify(dev, print_id);
+	do_verify(dev, print_id);
 	unload_print(dev, print_id);
 	release_device(dev);
 	return 0;

src/device.c

@@ -38,33 +38,20 @@ static gboolean fprint_device_verify_start(FprintDevice *rdev,
 	guint32 print_id, GError **error);
 static gboolean fprint_device_verify_stop(FprintDevice *rdev,
 	DBusGMethodInvocation *context);
-static gboolean fprint_device_get_verify_result(FprintDevice *rdev,
-	DBusGMethodInvocation *context);
 
 #include "device-dbus-glue.h"
 
 struct session_data {
-	/* a list of pending verify results to be returned via GetVerifyResult() */
-	GList *verify_results;
-
 	/* method invocation for async ClaimDevice() */
 	DBusGMethodInvocation *context_claim_device;
 
 	/* method invocation for async ReleaseDevice() */
 	DBusGMethodInvocation *context_release_device;
 
-	/* method invocation for async GetVerifyResult() */
-	DBusGMethodInvocation *context_get_verify_result;
-
 	/* a list of loaded prints */
 	GSList *loaded_prints;
 };
 
-struct verify_result {
-	int result;
-	struct fp_img *img;
-};
-
 struct loaded_print {
 	guint32 id;
 	struct fp_print_data *data;
@@ -85,8 +72,14 @@ enum fprint_device_properties {
 	FPRINT_DEVICE_CONSTRUCT_DDEV = 1,
 };
 
+enum fprint_device_signals {
+	SIGNAL_VERIFY_RESULT,
+	NUM_SIGNALS,
+};
+
 static GObjectClass *parent_class = NULL;
 static guint32 last_id = ~0;
+static guint signals[NUM_SIGNALS] = { 0, };
 
 static void device_finalize(GObject *object)
 {
@@ -120,6 +113,7 @@ static void device_class_init(FprintDeviceClass *klass)
 
 	gobject_class->finalize = device_finalize;
 	gobject_class->set_property = device_set_property;
+	g_type_class_add_private(klass, sizeof(FprintDevicePrivate));
 
 	pspec = g_param_spec_pointer("discovered-dev", "Discovered device",
 		"Set discovered device construction property",
@@ -127,7 +121,9 @@ static void device_class_init(FprintDeviceClass *klass)
 	g_object_class_install_property(gobject_class,
 		FPRINT_DEVICE_CONSTRUCT_DDEV, pspec);
 
-	g_type_class_add_private(klass, sizeof(FprintDevicePrivate));
+	signals[SIGNAL_VERIFY_RESULT] = g_signal_new("verify-result",
+		G_TYPE_FROM_CLASS(gobject_class), G_SIGNAL_RUN_LAST, 0, NULL, NULL,
+		g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
 }
 
 static void device_init(GTypeInstance *instance, gpointer g_class)
@@ -359,25 +355,10 @@ static void verify_cb(struct fp_dev *dev, int r, struct fp_img *img,
 	void *user_data)
 {
 	struct FprintDevice *rdev = user_data;
-	FprintDevicePrivate *priv = DEVICE_GET_PRIVATE(rdev);
-	struct session_data *session = priv->session;
 	g_message("verify_cb: result %d", r);
 
-	if (session->context_get_verify_result) {
-		/* if we have an app waiting on a verify result, report it
-		 * immediately */
-		dbus_g_method_return(session->context_get_verify_result, r, FALSE);
-		fp_img_free(img);
-		session->context_get_verify_result = NULL;
-	} else {
-		/* otherwise nobody is listening. add it to the queue of pending
-		 * results */
-		struct verify_result *result = g_slice_new(struct verify_result);
-		result->result = r;
-		result->img = img;
-		session->verify_results = g_list_append(session->verify_results,
-			result);
-	}
+	g_signal_emit(rdev, signals[SIGNAL_VERIFY_RESULT], 0, r);
+	fp_img_free(img);
 }
 
 static gboolean fprint_device_verify_start(FprintDevice *rdev,
@@ -421,32 +402,6 @@ static gboolean fprint_device_verify_start(FprintDevice *rdev,
 	return TRUE;
 }
 
-static gboolean fprint_device_get_verify_result(FprintDevice *rdev,
-	DBusGMethodInvocation *context)
-{
-	FprintDevicePrivate *priv = DEVICE_GET_PRIVATE(rdev);
-	struct session_data *session = priv->session;
-	GList *elem = session->verify_results;
-
-	if (elem == NULL) {
-		/* no pending results, asynchronously wait for the next one */
-		session->context_get_verify_result = context;
-		g_message("get_verify_result: none pending, waiting for next one");
-	} else {
-		struct verify_result *result = elem->data;
-		gboolean has_next = (g_list_next(elem) != NULL);
-		g_message("GetVerifyResult: returning pending result %d",
-			result->result);
-		dbus_g_method_return(context, result->result, has_next);
-		fp_img_free(result->img);
-		session->verify_results = g_list_delete_link(session->verify_results,
-			elem);
-		g_slice_free(struct verify_result, result);
-	}
-
-	return TRUE;
-}
-
 static void verify_stop_cb(struct fp_dev *dev, void *user_data)
 {
 	dbus_g_method_return((DBusGMethodInvocation *) user_data);
@@ -456,21 +411,8 @@ static gboolean fprint_device_verify_stop(FprintDevice *rdev,
 	DBusGMethodInvocation *context)
 {
 	FprintDevicePrivate *priv = DEVICE_GET_PRIVATE(rdev);
-	struct session_data *session = priv->session;
-	GList *elem = session->verify_results;
 	int r;
 
-	/* Free all unreaped verify results */
-	if (elem) {
-		do {
-			struct verify_result *result = elem->data;
-			fp_img_free(result->img);
-			g_slice_free(struct verify_result, result);
-		} while ((elem = g_list_next(elem)) != NULL);
-		g_list_free(session->verify_results);
-		session->verify_results = NULL;
-	}
-
 	r = fp_async_verify_stop(priv->dev, verify_stop_cb, context);
 	if (r < 0) {
 		GError *error;

src/device.xml

@@ -34,16 +34,9 @@
 			<annotation name="org.freedesktop.DBus.GLib.Async" value="" />
 		</method>
 
-		<method name="GetVerifyResult">
-			<annotation name="org.freedesktop.DBus.GLib.Async" value="" />
-			<arg type="i" name="result" direction="out" />
-			<arg type="b" name="more_results" direction="out" />
-		</method>
-
-		<!-- FIXME replace GetVerifyResult with this signal
 		<signal name="VerifyResult">
 			<arg type="i" name="result" />
-		</signal> -->
+		</signal>
 
 	</interface>
 </node>