zephyr/modusocket: Initial version of usocket module for Zephyr.

So far, socket creation and closure is implemented.

zephyr/modusocket.c

+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Linaro Limited
+ *
+ * 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/mpconfig.h"
+#ifdef MICROPY_PY_USOCKET
+
+#include "py/runtime.h"
+
+#include <zephyr.h>
+#include <net/net_context.h>
+#include <net/nbuf.h>
+
+typedef struct _socket_obj_t {
+    mp_obj_base_t base;
+    struct net_context *ctx;
+} socket_obj_t;
+
+STATIC const mp_obj_type_t socket_type;
+
+// Helper functions
+
+#define RAISE_ERRNO(x) { int _err = x; if (_err < 0) mp_raise_OSError(-_err); }
+
+// Methods
+
+STATIC void socket_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    socket_obj_t *self = self_in;
+    if (self->ctx == NULL) {
+        mp_printf(print, "<socket NULL>");
+    } else {
+        struct net_context *ctx = self->ctx;
+        mp_printf(print, "<socket %p type=%d>", ctx, net_context_get_type(ctx));
+    }
+}
+
+STATIC mp_obj_t socket_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_arg_check_num(n_args, n_kw, 0, 4, false);
+
+    socket_obj_t *socket = m_new_obj_with_finaliser(socket_obj_t);
+    socket->base.type = type;
+
+    int family = AF_INET;
+    int socktype = SOCK_STREAM;
+    int proto = -1;
+
+    if (n_args >= 1) {
+        family = mp_obj_get_int(args[0]);
+        if (n_args >= 2) {
+            socktype = mp_obj_get_int(args[1]);
+            if (n_args >= 3) {
+                proto = mp_obj_get_int(args[2]);
+            }
+        }
+    }
+
+    if (proto == -1) {
+        proto = IPPROTO_TCP;
+        if (socktype != SOCK_STREAM) {
+            proto = IPPROTO_UDP;
+        }
+    }
+
+    RAISE_ERRNO(net_context_get(family, socktype, proto, &socket->ctx));
+
+    return socket;
+}
+
+STATIC mp_obj_t socket_close(mp_obj_t self_in) {
+    socket_obj_t *socket = self_in;
+    if (socket->ctx != NULL) {
+        RAISE_ERRNO(net_context_put(socket->ctx));
+        socket->ctx = NULL;
+    }
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(socket_close_obj, socket_close);
+
+STATIC const mp_map_elem_t socket_locals_dict_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___del__), (mp_obj_t)&socket_close_obj },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&socket_close_obj },
+};
+STATIC MP_DEFINE_CONST_DICT(socket_locals_dict, socket_locals_dict_table);
+
+STATIC const mp_obj_type_t socket_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_socket,
+    .print = socket_print,
+    .make_new = socket_make_new,
+    //.protocol = &socket_stream_p,
+    .locals_dict = (mp_obj_t)&socket_locals_dict,
+};
+
+STATIC const mp_map_elem_t mp_module_usocket_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_usocket) },
+    // objects
+    { MP_OBJ_NEW_QSTR(MP_QSTR_socket), (mp_obj_t)&socket_type },
+    // class constants
+    { MP_OBJ_NEW_QSTR(MP_QSTR_AF_INET), MP_OBJ_NEW_SMALL_INT(AF_INET) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_AF_INET6), MP_OBJ_NEW_SMALL_INT(AF_INET6) },
+
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SOCK_STREAM), MP_OBJ_NEW_SMALL_INT(SOCK_STREAM) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_SOCK_DGRAM), MP_OBJ_NEW_SMALL_INT(SOCK_DGRAM) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(mp_module_usocket_globals, mp_module_usocket_globals_table);
+
+const mp_obj_module_t mp_module_usocket = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&mp_module_usocket_globals,
+};
+
+#endif // MICROPY_PY_USOCKET