circuitpython/shared-bindings/bleio/Service.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2017 Glenn Ruben Bakke
 * Copyright (c) 2018 Artur Pacholec
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/bleio/Characteristic.h"
#include "shared-bindings/bleio/Service.h"
#include "shared-bindings/bleio/UUID.h"

//| .. currentmodule:: bleio
//|
//| :class:`Service` -- BLE service
//| =========================================================
//|
//| Stores information about a BLE service and its characteristics.
//|

//| .. class:: Service(uuid, characteristics, *, secondary=False)
//|
//|   Create a new Service object identified by the specified UUID.
//|   To mark the service as secondary, pass `True` as :py:data:`secondary`.
//|
//|   :param bleio.UUID uuid: The uuid of the service
//|   :param iterable characteristics: the Characteristic objects for this service
//|   :param bool secondary: If the service is a secondary one
//|

STATIC mp_obj_t bleio_service_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) {
    mp_arg_check_num(n_args, n_kw, 2, 3, true);
    bleio_service_obj_t *self = m_new_obj(bleio_service_obj_t);
    self->char_list = mp_obj_new_list(0, NULL);
    self->base.type = &bleio_service_type;
    self->device = mp_const_none;
    self->handle = 0xFFFF;

    mp_map_t kw_args;
    mp_map_init_fixed_table(&kw_args, n_kw, pos_args + n_args);

    enum { ARG_uuid, ARG_characteristics, ARG_secondary };
    static const mp_arg_t allowed_args[] = {
        { MP_QSTR_uuid, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_characteristics, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = mp_const_none} },
        { MP_QSTR_secondary, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
    };

    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
    mp_arg_parse_all(n_args, pos_args, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);

    self->is_secondary = args[ARG_secondary].u_bool;

    const mp_obj_t uuid = args[ARG_uuid].u_obj;

    if (!MP_OBJ_IS_TYPE(uuid, &bleio_uuid_type)) {
        mp_raise_ValueError(translate("Expected a UUID"));
    }

    self->uuid = MP_OBJ_TO_PTR(uuid);

    // If characteristics is not an iterable, an exception will be thrown.
    mp_obj_iter_buf_t iter_buf;
    mp_obj_t iterable = mp_getiter(args[ARG_characteristics].u_obj, &iter_buf);
    mp_obj_t characteristic;

    while ((characteristic = mp_iternext(iterable)) != MP_OBJ_STOP_ITERATION) {
        if (!MP_OBJ_IS_TYPE(characteristic, &bleio_characteristic_type)) {
            mp_raise_ValueError(translate("characteristics includes an object that is not a Characteristic"));
        }
        bleio_characteristic_obj_t *characteristic_ptr = MP_OBJ_TO_PTR(characteristic);
        if (common_hal_bleio_uuid_get_uuid128_reference(uuid) !=
            common_hal_bleio_uuid_get_uuid128_reference(characteristic_ptr->uuid)) {
            // The descriptor base UUID doesn't match the characteristic base UUID.
            mp_raise_ValueError(translate("Characteristic UUID doesn't match Service UUID"));
        }
        characteristic_ptr->service = self;
        mp_obj_list_append(self->char_list, characteristic);
    }

    // Do port-specific initialization.
    common_hal_bleio_service_construct(self);

    return MP_OBJ_FROM_PTR(self);
}

//|   .. attribute:: characteristics
//|
//|     A `list` of `bleio.Characteristic` that are offered by this service. (read-only)
//|
STATIC mp_obj_t bleio_service_get_characteristics(mp_obj_t self_in) {
    bleio_service_obj_t *self = MP_OBJ_TO_PTR(self_in);
    // Return list as a tuple so user won't be able to change it.
    mp_obj_list_t *char_list = MP_OBJ_TO_PTR(self->char_list);
    return mp_obj_new_tuple(char_list->len, char_list->items);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_service_get_characteristics_obj, bleio_service_get_characteristics);

const mp_obj_property_t bleio_service_characteristics_obj = {
    .base.type = &mp_type_property,
    .proxy = { (mp_obj_t)&bleio_service_get_characteristics_obj,
               (mp_obj_t)&mp_const_none_obj,
               (mp_obj_t)&mp_const_none_obj },
};

//|   .. attribute:: uuid
//|
//|     The UUID of this service. (read-only)
//|
STATIC mp_obj_t bleio_service_get_uuid(mp_obj_t self_in) {
    bleio_service_obj_t *self = MP_OBJ_TO_PTR(self_in);

    return MP_OBJ_FROM_PTR(self->uuid);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(bleio_service_get_uuid_obj, bleio_service_get_uuid);

const mp_obj_property_t bleio_service_uuid_obj = {
    .base.type = &mp_type_property,
    .proxy = { (mp_obj_t)&bleio_service_get_uuid_obj,
               (mp_obj_t)&mp_const_none_obj,
               (mp_obj_t)&mp_const_none_obj },
};

STATIC const mp_rom_map_elem_t bleio_service_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_characteristics),    MP_ROM_PTR(&bleio_service_characteristics_obj) },
    { MP_ROM_QSTR(MP_QSTR_uuid),               MP_ROM_PTR(&bleio_service_uuid_obj) },
};

STATIC MP_DEFINE_CONST_DICT(bleio_service_locals_dict, bleio_service_locals_dict_table);

const mp_obj_type_t bleio_service_type = {
    { &mp_type_type },
    .name = MP_QSTR_Service,
    .make_new = bleio_service_make_new,
    .locals_dict = (mp_obj_dict_t*)&bleio_service_locals_dict
};