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f7149e90c2
https://libwebsockets.org/pipermail/libwebsockets/2019-April/007937.html thanks to Bruce Perens for noting it. This doesn't change the intention or status of the CC0 files, they were pure CC0 before (ie, public domain) and they are pure CC0 now. It just gets rid of the (C) part at the top of the dedication which may be read to be a bit contradictory since the purpose is to make it public domain.
152 lines
4 KiB
C
152 lines
4 KiB
C
/*
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* ws protocol handler plugin for "dumb increment"
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*
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* Written in 2010-2019 by 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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* These test plugins 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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* This is a copy of dumb_increment adapted slightly to serve as the
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* "example-standalone-protocol", to show how to build protocol plugins
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* outside the library easily.
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*/
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#define LWS_DLL
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#define LWS_INTERNAL
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#include <libwebsockets.h>
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#include <string.h>
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struct per_vhost_data__dumb_increment {
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uv_timer_t timeout_watcher;
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struct lws_context *context;
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struct lws_vhost *vhost;
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const struct lws_protocols *protocol;
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};
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struct per_session_data__dumb_increment {
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int number;
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};
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static void
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uv_timeout_cb_dumb_increment(uv_timer_t *w
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#if UV_VERSION_MAJOR == 0
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, int status
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#endif
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)
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{
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struct per_vhost_data__dumb_increment *vhd = lws_container_of(w,
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struct per_vhost_data__dumb_increment, timeout_watcher);
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lws_callback_on_writable_all_protocol_vhost(vhd->vhost, vhd->protocol);
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}
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static int
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callback_dumb_increment(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__dumb_increment *pss =
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(struct per_session_data__dumb_increment *)user;
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struct per_vhost_data__dumb_increment *vhd =
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(struct per_vhost_data__dumb_increment *)
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lws_protocol_vh_priv_get(lws_get_vhost(wsi),
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lws_get_protocol(wsi));
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unsigned char buf[LWS_PRE + 512];
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unsigned char *p = &buf[LWS_PRE];
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int n, m;
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switch (reason) {
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case LWS_CALLBACK_PROTOCOL_INIT:
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vhd = lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
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lws_get_protocol(wsi),
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sizeof(struct per_vhost_data__dumb_increment));
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vhd->context = lws_get_context(wsi);
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vhd->protocol = lws_get_protocol(wsi);
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vhd->vhost = lws_get_vhost(wsi);
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uv_timer_init(lws_uv_getloop(vhd->context, 0),
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&vhd->timeout_watcher);
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uv_timer_start(&vhd->timeout_watcher,
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uv_timeout_cb_dumb_increment, 50, 50);
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break;
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case LWS_CALLBACK_PROTOCOL_DESTROY:
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if (!vhd)
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break;
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uv_timer_stop(&vhd->timeout_watcher);
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break;
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case LWS_CALLBACK_ESTABLISHED:
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pss->number = 0;
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break;
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case LWS_CALLBACK_SERVER_WRITEABLE:
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n = sprintf((char *)p, "%d", pss->number++);
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m = lws_write(wsi, p, n, LWS_WRITE_TEXT);
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if (m < n) {
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lwsl_err("ERROR %d writing to di socket\n", n);
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return -1;
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}
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break;
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case LWS_CALLBACK_RECEIVE:
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if (len < 6)
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break;
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if (strcmp((const char *)in, "reset\n") == 0)
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pss->number = 0;
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if (strcmp((const char *)in, "closeme\n") == 0) {
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lwsl_notice("dumb_inc: closing as requested\n");
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lws_close_reason(wsi, LWS_CLOSE_STATUS_GOINGAWAY,
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(unsigned char *)"seeya", 5);
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return -1;
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}
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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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static const struct lws_protocols protocols[] = {
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{
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"example-standalone-protocol",
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callback_dumb_increment,
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sizeof(struct per_session_data__dumb_increment),
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10, /* rx buf size must be >= permessage-deflate rx size */
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},
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};
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LWS_VISIBLE int
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init_protocol_example_standalone(struct lws_context *context,
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struct lws_plugin_capability *c)
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{
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if (c->api_magic != LWS_PLUGIN_API_MAGIC) {
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lwsl_err("Plugin API %d, library API %d", LWS_PLUGIN_API_MAGIC,
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c->api_magic);
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return 1;
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}
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c->protocols = protocols;
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c->count_protocols = LWS_ARRAY_SIZE(protocols);
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c->extensions = NULL;
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c->count_extensions = 0;
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return 0;
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}
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LWS_VISIBLE int
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destroy_protocol_example_standalone(struct lws_context *context)
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{
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return 0;
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}
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