kopia lustrzana https://github.com/micropython/micropython
319 wiersze
11 KiB
C
319 wiersze
11 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include "py/nlr.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "extmod/modwebsocket.h"
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#if MICROPY_PY_WEBSOCKET
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enum { FRAME_HEADER, FRAME_OPT, PAYLOAD, CONTROL };
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enum { BLOCKING_WRITE = 0x80 };
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typedef struct _mp_obj_websocket_t {
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mp_obj_base_t base;
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mp_obj_t sock;
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uint32_t msg_sz;
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byte mask[4];
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byte state;
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byte to_recv;
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byte mask_pos;
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byte buf_pos;
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byte buf[6];
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byte opts;
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// Copy of last data frame flags
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byte ws_flags;
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// Copy of current frame flags
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byte last_flags;
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} mp_obj_websocket_t;
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STATIC mp_uint_t websocket_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode);
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STATIC mp_obj_t websocket_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 1, 2, false);
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mp_obj_websocket_t *o = m_new_obj(mp_obj_websocket_t);
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o->base.type = type;
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o->sock = args[0];
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o->state = FRAME_HEADER;
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o->to_recv = 2;
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o->mask_pos = 0;
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o->buf_pos = 0;
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o->opts = FRAME_TXT;
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if (n_args > 1 && args[1] == mp_const_true) {
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o->opts |= BLOCKING_WRITE;
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}
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return MP_OBJ_FROM_PTR(o);
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}
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STATIC mp_uint_t websocket_read(mp_obj_t self_in, void *buf, mp_uint_t size, int *errcode) {
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mp_obj_websocket_t *self = MP_OBJ_TO_PTR(self_in);
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const mp_stream_p_t *stream_p = mp_get_stream_raise(self->sock, MP_STREAM_OP_READ);
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while (1) {
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if (self->to_recv != 0) {
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mp_uint_t out_sz = stream_p->read(self->sock, self->buf + self->buf_pos, self->to_recv, errcode);
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if (out_sz == 0 || out_sz == MP_STREAM_ERROR) {
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return out_sz;
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}
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self->buf_pos += out_sz;
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self->to_recv -= out_sz;
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if (self->to_recv != 0) {
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*errcode = MP_EAGAIN;
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return MP_STREAM_ERROR;
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}
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}
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switch (self->state) {
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case FRAME_HEADER: {
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// TODO: Split frame handling below is untested so far, so conservatively disable it
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assert(self->buf[0] & 0x80);
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// "Control frames MAY be injected in the middle of a fragmented message."
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// So, they must be processed before data frames (and not alter
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// self->ws_flags)
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byte frame_type = self->buf[0];
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self->last_flags = frame_type;
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frame_type &= FRAME_OPCODE_MASK;
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if ((self->buf[0] & FRAME_OPCODE_MASK) == FRAME_CONT) {
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// Preserve previous frame type
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self->ws_flags = (self->ws_flags & FRAME_OPCODE_MASK) | (self->buf[0] & ~FRAME_OPCODE_MASK);
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} else {
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self->ws_flags = self->buf[0];
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}
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// Reset mask in case someone will use "simplified" protocol
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// without masks.
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memset(self->mask, 0, sizeof(self->mask));
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int to_recv = 0;
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size_t sz = self->buf[1] & 0x7f;
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if (sz == 126) {
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// Msg size is next 2 bytes
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to_recv += 2;
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} else if (sz == 127) {
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// Msg size is next 8 bytes
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assert(0);
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}
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if (self->buf[1] & 0x80) {
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// Next 4 bytes is mask
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to_recv += 4;
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}
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self->buf_pos = 0;
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self->to_recv = to_recv;
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self->msg_sz = sz; // May be overridden by FRAME_OPT
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if (to_recv != 0) {
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self->state = FRAME_OPT;
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} else {
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if (frame_type >= FRAME_CLOSE) {
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self->state = CONTROL;
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} else {
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self->state = PAYLOAD;
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}
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}
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continue;
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}
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case FRAME_OPT: {
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if ((self->buf_pos & 3) == 2) {
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// First two bytes are message length
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self->msg_sz = (self->buf[0] << 8) | self->buf[1];
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}
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if (self->buf_pos >= 4) {
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// Last 4 bytes is mask
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memcpy(self->mask, self->buf + self->buf_pos - 4, 4);
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}
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self->buf_pos = 0;
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if ((self->last_flags & FRAME_OPCODE_MASK) >= FRAME_CLOSE) {
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self->state = CONTROL;
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} else {
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self->state = PAYLOAD;
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}
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continue;
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}
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case PAYLOAD:
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case CONTROL: {
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mp_uint_t out_sz = 0;
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if (self->msg_sz == 0) {
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// In case message had zero payload
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goto no_payload;
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}
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size_t sz = MIN(size, self->msg_sz);
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out_sz = stream_p->read(self->sock, buf, sz, errcode);
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if (out_sz == 0 || out_sz == MP_STREAM_ERROR) {
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return out_sz;
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}
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sz = out_sz;
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for (byte *p = buf; sz--; p++) {
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*p ^= self->mask[self->mask_pos++ & 3];
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}
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self->msg_sz -= out_sz;
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if (self->msg_sz == 0) {
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byte last_state;
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no_payload:
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last_state = self->state;
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self->state = FRAME_HEADER;
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self->to_recv = 2;
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self->mask_pos = 0;
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self->buf_pos = 0;
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// Handle control frame
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if (last_state == CONTROL) {
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byte frame_type = self->last_flags & FRAME_OPCODE_MASK;
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if (frame_type == FRAME_CLOSE) {
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static char close_resp[2] = {0x88, 0};
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int err;
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websocket_write(self_in, close_resp, sizeof(close_resp), &err);
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return 0;
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}
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//DEBUG_printf("Finished receiving ctrl message %x, ignoring\n", self->last_flags);
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continue;
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}
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}
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if (out_sz != 0) {
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return out_sz;
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}
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// Empty (data) frame received is not EOF
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continue;
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}
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}
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}
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}
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STATIC mp_uint_t websocket_write(mp_obj_t self_in, const void *buf, mp_uint_t size, int *errcode) {
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mp_obj_websocket_t *self = MP_OBJ_TO_PTR(self_in);
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assert(size < 0x10000);
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byte header[4] = {0x80 | (self->opts & FRAME_OPCODE_MASK)};
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int hdr_sz;
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if (size < 126) {
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header[1] = size;
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hdr_sz = 2;
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} else {
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header[1] = 126;
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header[2] = size >> 8;
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header[3] = size & 0xff;
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hdr_sz = 4;
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}
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mp_obj_t dest[3];
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if (self->opts & BLOCKING_WRITE) {
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mp_load_method(self->sock, MP_QSTR_setblocking, dest);
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dest[2] = mp_const_true;
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mp_call_method_n_kw(1, 0, dest);
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}
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mp_uint_t out_sz = mp_stream_write_exactly(self->sock, header, hdr_sz, errcode);
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if (*errcode == 0) {
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out_sz = mp_stream_write_exactly(self->sock, buf, size, errcode);
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}
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if (self->opts & BLOCKING_WRITE) {
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dest[2] = mp_const_false;
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mp_call_method_n_kw(1, 0, dest);
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}
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if (*errcode != 0) {
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return MP_STREAM_ERROR;
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}
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return out_sz;
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}
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STATIC mp_uint_t websocket_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
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mp_obj_websocket_t *self = MP_OBJ_TO_PTR(self_in);
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switch (request) {
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case MP_STREAM_GET_DATA_OPTS:
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return self->ws_flags & FRAME_OPCODE_MASK;
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case MP_STREAM_SET_DATA_OPTS: {
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int cur = self->opts & FRAME_OPCODE_MASK;
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self->opts = (self->opts & ~FRAME_OPCODE_MASK) | (arg & FRAME_OPCODE_MASK);
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return cur;
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}
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default:
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*errcode = MP_EINVAL;
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return MP_STREAM_ERROR;
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}
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}
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STATIC mp_obj_t websocket_close(mp_obj_t self_in) {
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mp_obj_websocket_t *self = MP_OBJ_TO_PTR(self_in);
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// TODO: Send close signaling to the other side, otherwise it's
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// abrupt close (connection abort).
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return mp_stream_close(self->sock);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(websocket_close_obj, websocket_close);
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STATIC const mp_rom_map_elem_t websocket_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
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{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&mp_stream_ioctl_obj) },
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{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&websocket_close_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(websocket_locals_dict, websocket_locals_dict_table);
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STATIC const mp_stream_p_t websocket_stream_p = {
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.read = websocket_read,
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.write = websocket_write,
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.ioctl = websocket_ioctl,
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};
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STATIC const mp_obj_type_t websocket_type = {
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{ &mp_type_type },
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.name = MP_QSTR_websocket,
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.make_new = websocket_make_new,
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.protocol = &websocket_stream_p,
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.locals_dict = (void*)&websocket_locals_dict,
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};
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STATIC const mp_rom_map_elem_t websocket_module_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_websocket) },
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{ MP_ROM_QSTR(MP_QSTR_websocket), MP_ROM_PTR(&websocket_type) },
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};
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STATIC MP_DEFINE_CONST_DICT(websocket_module_globals, websocket_module_globals_table);
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const mp_obj_module_t mp_module_websocket = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t*)&websocket_module_globals,
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};
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#endif // MICROPY_PY_WEBSOCKET
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