printers: Add async method for listing print devices
This commit adds asynchronous function get_cups_devices_async() which sequentially executes CUPS' backends and returns found devices by a callback. (#683229)
This commit is contained in:
Marek Kasik
parent
5a2794a7fe
commit
0cb0dab377
2 changed files with 315 additions and 0 deletions
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@ -4587,6 +4587,292 @@ printer_add_option_async (const gchar *printer_name,
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data);
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}
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typedef struct
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{
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GCancellable *cancellable;
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GCDCallback callback;
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gpointer user_data;
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GList *backend_list;
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} GCDData;
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static gint
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get_suffix_index (gchar *string)
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{
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gchar *number;
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gchar *endptr;
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gint index = -1;
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number = g_strrstr (string, ":");
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if (number)
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{
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number++;
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index = g_ascii_strtoll (number, &endptr, 10);
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if (index == 0 && endptr == number)
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index = -1;
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}
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return index;
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}
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static void
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get_cups_devices_async_dbus_cb (GObject *source_object,
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GAsyncResult *res,
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gpointer user_data)
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{
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PpPrintDevice **devices = NULL;
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GVariant *output;
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GCDData *data = (GCDData *) user_data;
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GError *error = NULL;
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GList *result = NULL;
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gint num_of_devices = 0;
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output = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source_object),
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res,
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&error);
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if (output)
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{
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const gchar *ret_error;
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GVariant *devices_variant = NULL;
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g_variant_get (output, "(&s@a{ss})",
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&ret_error,
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&devices_variant);
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if (ret_error[0] != '\0')
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{
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g_warning ("%s", ret_error);
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}
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if (devices_variant)
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{
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GVariantIter *iter;
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GVariant *item;
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gchar *key;
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gchar *value;
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gint index = -1, max_index = -1, i;
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g_variant_get (devices_variant, "a{ss}", &iter);
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while ((item = g_variant_iter_next_value (iter)))
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{
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g_variant_get (item, "{ss}", &key, &value);
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index = get_suffix_index (key);
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if (index > max_index)
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max_index = index;
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g_free (key);
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g_free (value);
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g_variant_unref (item);
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}
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if (max_index >= 0)
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{
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num_of_devices = max_index + 1;
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devices = g_new0 (PpPrintDevice *, num_of_devices);
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g_variant_get (devices_variant, "a{ss}", &iter);
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while ((item = g_variant_iter_next_value (iter)))
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{
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g_variant_get (item, "{ss}", &key, &value);
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index = get_suffix_index (key);
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if (index >= 0)
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{
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if (!devices[index])
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devices[index] = g_new0 (PpPrintDevice, 1);
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if (g_str_has_prefix (key, "device-class"))
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devices[index]->device_class = g_strdup (value);
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else if (g_str_has_prefix (key, "device-id"))
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devices[index]->device_id = g_strdup (value);
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else if (g_str_has_prefix (key, "device-info"))
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devices[index]->device_info = g_strdup (value);
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else if (g_str_has_prefix (key, "device-make-and-model"))
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{
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devices[index]->device_make_and_model = g_strdup (value);
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devices[index]->device_name = g_strdup (value);
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}
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else if (g_str_has_prefix (key, "device-uri"))
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devices[index]->device_uri = g_strdup (value);
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else if (g_str_has_prefix (key, "device-location"))
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devices[index]->device_location = g_strdup (value);
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devices[index]->acquisition_method = ACQUISITION_METHOD_DEFAULT_CUPS_SERVER;
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}
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g_free (key);
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g_free (value);
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g_variant_unref (item);
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}
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for (i = 0; i < num_of_devices; i++)
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result = g_list_append (result, devices[i]);
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g_free (devices);
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}
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g_variant_unref (devices_variant);
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}
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g_variant_unref (output);
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}
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else
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{
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if (error->domain != G_IO_ERROR ||
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error->code != G_IO_ERROR_CANCELLED)
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g_warning ("%s", error->message);
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g_error_free (error);
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data->callback (result,
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TRUE,
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g_cancellable_is_cancelled (data->cancellable),
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data->user_data);
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g_list_free_full (data->backend_list, g_free);
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data->backend_list = NULL;
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g_object_unref (source_object);
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if (data->cancellable)
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g_object_unref (data->cancellable);
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g_free (data);
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return;
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}
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if (data->backend_list)
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{
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if (!g_cancellable_is_cancelled (data->cancellable))
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{
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GVariantBuilder include_scheme_builder;
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data->callback (result,
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FALSE,
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FALSE,
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data->user_data);
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g_variant_builder_init (&include_scheme_builder, G_VARIANT_TYPE ("as"));
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g_variant_builder_add (&include_scheme_builder, "s", data->backend_list->data);
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g_free (data->backend_list->data);
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data->backend_list = g_list_remove_link (data->backend_list, data->backend_list);
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g_dbus_connection_call (G_DBUS_CONNECTION (g_object_ref (source_object)),
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MECHANISM_BUS,
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"/",
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MECHANISM_BUS,
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"DevicesGet",
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g_variant_new ("(iiasas)",
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0,
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0,
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&include_scheme_builder,
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NULL),
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G_VARIANT_TYPE ("(sa{ss})"),
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G_DBUS_CALL_FLAGS_NONE,
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DBUS_TIMEOUT,
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data->cancellable,
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get_cups_devices_async_dbus_cb,
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user_data);
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return;
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}
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else
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{
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data->callback (result,
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TRUE,
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TRUE,
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data->user_data);
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g_list_free_full (data->backend_list, g_free);
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data->backend_list = NULL;
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}
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}
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else
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{
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data->callback (result,
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TRUE,
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g_cancellable_is_cancelled (data->cancellable),
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data->user_data);
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}
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g_object_unref (source_object);
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if (data->cancellable)
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g_object_unref (data->cancellable);
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g_free (data);
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}
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void
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get_cups_devices_async (GCancellable *cancellable,
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GCDCallback callback,
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gpointer user_data)
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{
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GDBusConnection *bus;
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GVariantBuilder include_scheme_builder;
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GCDData *data;
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GError *error = NULL;
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gint i;
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const gchar *backends[] =
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{"hpfax", "ncp", "beh", "bluetooth", "snmp",
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"dnssd", "hp", "ipp", "lpd", "parallel",
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"serial", "socket", "usb", NULL};
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bus = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);
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if (!bus)
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{
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g_warning ("Failed to get system bus: %s", error->message);
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g_error_free (error);
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callback (NULL, TRUE, FALSE, user_data);
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return;
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}
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data = g_new0 (GCDData, 1);
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if (cancellable)
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data->cancellable = g_object_ref (cancellable);
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data->callback = callback;
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data->user_data = user_data;
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for (i = 0; backends[i]; i++)
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data->backend_list = g_list_prepend (data->backend_list, g_strdup (backends[i]));
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g_variant_builder_init (&include_scheme_builder, G_VARIANT_TYPE ("as"));
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g_variant_builder_add (&include_scheme_builder, "s", data->backend_list->data);
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g_free (data->backend_list->data);
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data->backend_list = g_list_remove_link (data->backend_list, data->backend_list);
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g_dbus_connection_call (bus,
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MECHANISM_BUS,
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"/",
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MECHANISM_BUS,
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"DevicesGet",
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g_variant_new ("(iiasas)",
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0,
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0,
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&include_scheme_builder,
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NULL),
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G_VARIANT_TYPE ("(sa{ss})"),
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G_DBUS_CALL_FLAGS_NONE,
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DBUS_TIMEOUT,
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cancellable,
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get_cups_devices_async_dbus_cb,
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data);
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}
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void
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pp_print_device_free (PpPrintDevice *device)
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{
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if (device)
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{
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g_free (device->device_class);
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g_free (device->device_id);
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g_free (device->device_info);
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g_free (device->device_make_and_model);
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g_free (device->device_uri);
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g_free (device->device_location);
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g_free (device->device_name);
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g_free (device->device_ppd);
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g_free (device);
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}
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}
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typedef struct
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{
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gchar *printer_name;
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@ -46,6 +46,11 @@ enum
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PPD_EXACT_CMD_MATCH
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};
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enum
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{
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ACQUISITION_METHOD_DEFAULT_CUPS_SERVER = 0
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};
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typedef struct
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{
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gchar *ppd_name;
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@ -266,6 +271,30 @@ void job_set_hold_until_async (gint job_id,
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GCancellable *cancellable,
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JSHUCallback callback,
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gpointer user_data);
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typedef struct{
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gchar *device_class;
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gchar *device_id;
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gchar *device_info;
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gchar *device_make_and_model;
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gchar *device_uri;
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gchar *device_location;
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gchar *device_name;
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gchar *device_ppd;
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gchar *host_name;
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gint host_port;
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gint acquisition_method;
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} PpPrintDevice;
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void pp_print_device_free (PpPrintDevice *device);
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typedef void (*GCDCallback) (GList *devices,
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gboolean finished,
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gboolean cancelled,
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gpointer user_data);
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void get_cups_devices_async (GCancellable *cancellable,
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GCDCallback callback,
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gpointer user_data);
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G_END_DECLS
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