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ebfdb0d24d
The test apps are intended to be adapted into user code freely, this relicenses them public domain to make that clear. Fixes and improvements are of course still welcome. LICENSE clarifies now that some sources also have a more liberal license, it was always told in the source itself but now it's summarized. Signed-off-by: Andy Green <andy.green@linaro.org>
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* libwebsockets-test-server - libwebsockets test implementation
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*
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* Copyright (C) 2010-2016 Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* The person who associated a work with this deed has dedicated
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* the work to the public domain by waiving all of his or her rights
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* to the work worldwide under copyright law, including all related
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* and neighboring rights, to the extent allowed by law. You can copy,
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* modify, distribute and perform the work, even for commercial purposes,
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* all without asking permission.
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*
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* The test apps are intended to be adapted for use in your code, which
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* may be proprietary. So unlike the library itself, they are licensed
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* Public Domain.
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*/
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#include "test-server.h"
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/* lws-mirror_protocol */
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#define MAX_MESSAGE_QUEUE 32
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struct a_message {
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void *payload;
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size_t len;
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};
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static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
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static int ringbuffer_head;
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int
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callback_lws_mirror(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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struct per_session_data__lws_mirror *pss =
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(struct per_session_data__lws_mirror *)user;
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int n;
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switch (reason) {
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case LWS_CALLBACK_ESTABLISHED:
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lwsl_info("%s: LWS_CALLBACK_ESTABLISHED\n", __func__);
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pss->ringbuffer_tail = ringbuffer_head;
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pss->wsi = wsi;
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break;
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case LWS_CALLBACK_PROTOCOL_DESTROY:
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lwsl_notice("%s: mirror protocol cleaning up\n", __func__);
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for (n = 0; n < sizeof ringbuffer / sizeof ringbuffer[0]; n++)
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if (ringbuffer[n].payload)
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free(ringbuffer[n].payload);
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:
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if (close_testing)
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break;
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while (pss->ringbuffer_tail != ringbuffer_head) {
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n = lws_write(wsi, (unsigned char *)
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ringbuffer[pss->ringbuffer_tail].payload +
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LWS_SEND_BUFFER_PRE_PADDING,
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ringbuffer[pss->ringbuffer_tail].len,
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LWS_WRITE_TEXT);
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if (n < 0) {
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lwsl_err("ERROR %d writing to mirror socket\n", n);
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return -1;
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}
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if (n < (int)ringbuffer[pss->ringbuffer_tail].len)
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lwsl_err("mirror partial write %d vs %d\n",
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n, ringbuffer[pss->ringbuffer_tail].len);
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if (pss->ringbuffer_tail == (MAX_MESSAGE_QUEUE - 1))
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pss->ringbuffer_tail = 0;
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else
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pss->ringbuffer_tail++;
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if (((ringbuffer_head - pss->ringbuffer_tail) &
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(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 15))
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lws_rx_flow_allow_all_protocol(lws_get_context(wsi),
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lws_get_protocol(wsi));
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if (lws_partial_buffered(wsi) || lws_send_pipe_choked(wsi)) {
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lws_callback_on_writable(wsi);
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break;
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}
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}
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break;
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case LWS_CALLBACK_RECEIVE:
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if (((ringbuffer_head - pss->ringbuffer_tail) &
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(MAX_MESSAGE_QUEUE - 1)) == (MAX_MESSAGE_QUEUE - 1)) {
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lwsl_err("dropping!\n");
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goto choke;
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}
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if (ringbuffer[ringbuffer_head].payload)
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free(ringbuffer[ringbuffer_head].payload);
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ringbuffer[ringbuffer_head].payload =
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malloc(LWS_SEND_BUFFER_PRE_PADDING + len +
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LWS_SEND_BUFFER_POST_PADDING);
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ringbuffer[ringbuffer_head].len = len;
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memcpy((char *)ringbuffer[ringbuffer_head].payload +
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LWS_SEND_BUFFER_PRE_PADDING, in, len);
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if (ringbuffer_head == (MAX_MESSAGE_QUEUE - 1))
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ringbuffer_head = 0;
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else
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ringbuffer_head++;
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if (((ringbuffer_head - pss->ringbuffer_tail) &
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(MAX_MESSAGE_QUEUE - 1)) != (MAX_MESSAGE_QUEUE - 2))
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goto done;
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choke:
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lwsl_debug("LWS_CALLBACK_RECEIVE: throttling %p\n", wsi);
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lws_rx_flow_control(wsi, 0);
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done:
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lws_callback_on_writable_all_protocol(lws_get_context(wsi),
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lws_get_protocol(wsi));
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break;
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/*
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* this just demonstrates how to use the protocol filter. If you won't
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* study and reject connections based on header content, you don't need
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* to handle this callback
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*/
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case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
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dump_handshake_info(wsi);
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/* you could return non-zero here and kill the connection */
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break;
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default:
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break;
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}
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return 0;
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}
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