zephyr/modusocket: Refactor send() into stream write() method.

zephyr/modusocket.c

@@ -28,6 +28,7 @@
 #ifdef MICROPY_PY_USOCKET
 
 #include "py/runtime.h"
+#include "py/stream.h"
 
 #include <stdio.h>
 #include <zephyr.h>
@@ -300,29 +301,44 @@ STATIC mp_obj_t socket_accept(mp_obj_t self_in) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_1(socket_accept_obj, socket_accept);
 
-STATIC mp_obj_t socket_send(mp_obj_t self_in, mp_obj_t buf_in) {
+STATIC mp_uint_t sock_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
     socket_obj_t *socket = self_in;
-    socket_check_closed(socket);
-
-    mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
+    if (socket->ctx == NULL) {
+        // already closed
+        *errcode = EBADF;
+        return MP_STREAM_ERROR;
+    }
 
     struct net_buf *send_buf = net_nbuf_get_tx(socket->ctx, K_FOREVER);
 
     unsigned len = net_if_get_mtu(net_context_get_iface(socket->ctx));
     // Arbitrary value to account for protocol headers
     len -= 64;
-    if (len > bufinfo.len) {
-        len = bufinfo.len;
+    if (len > size) {
+        len = size;
     }
 
-    if (!net_nbuf_append(send_buf, len, bufinfo.buf, K_FOREVER)) {
+    if (!net_nbuf_append(send_buf, len, buf, K_FOREVER)) {
         len = net_buf_frags_len(send_buf);
-        //mp_raise_OSError(ENOSPC);
     }
 
-    RAISE_ERRNO(net_context_send(send_buf, /*cb*/NULL, K_FOREVER, NULL, NULL));
+    int err = net_context_send(send_buf, /*cb*/NULL, K_FOREVER, NULL, NULL);
+    if (err < 0) {
+        *errcode = -err;
+        return MP_STREAM_ERROR;
+    }
 
+    return len;
+}
+
+STATIC mp_obj_t socket_send(mp_obj_t self_in, mp_obj_t buf_in) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buf_in, &bufinfo, MP_BUFFER_READ);
+    int err = 0;
+    mp_uint_t len = sock_write(self_in, bufinfo.buf, bufinfo.len, &err);
+    if (len == MP_STREAM_ERROR) {
+        mp_raise_OSError(err);
+    }
     return mp_obj_new_int_from_uint(len);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_2(socket_send_obj, socket_send);
@@ -436,12 +452,18 @@ STATIC const mp_map_elem_t socket_locals_dict_table[] = {
 };
 STATIC MP_DEFINE_CONST_DICT(socket_locals_dict, socket_locals_dict_table);
 
+STATIC const mp_stream_p_t socket_stream_p = {
+    //.read = sock_read,
+    .write = sock_write,
+    //.ioctl = sock_ioctl,
+};
+
 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,
+    .protocol = &socket_stream_p,
     .locals_dict = (mp_obj_t)&socket_locals_dict,
 };