54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
// Copyright (c) 2020 Cesanta Software Limited
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// All rights reserved
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//
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// Example Websocket server with timers. This is a simple Websocket echo
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// server, which sends a message to all connected clients periodically,
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// using timer API.
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#include "mongoose.h"
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static const char *s_listen_on = "http://localhost:8000";
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static const char *s_web_root = "web_root";
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// This RESTful server implements the following endpoints:
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static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
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if (ev == MG_EV_HTTP_MSG) {
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struct mg_http_message *hm = (struct mg_http_message *) ev_data;
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if (mg_http_match_uri(hm, "/websocket")) {
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mg_ws_upgrade(c, hm, NULL); // Upgrade HTTP to Websocket
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c->data[0] = 'W'; // Set some unique mark on a connection
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} else {
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// Serve static files
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struct mg_http_serve_opts opts = {.root_dir = s_web_root};
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mg_http_serve_dir(c, ev_data, &opts);
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}
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} else if (ev == MG_EV_WS_MSG) {
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// Got websocket frame. Received data is wm->data. Echo it back!
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struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
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mg_ws_send(c, wm->data.ptr, wm->data.len, WEBSOCKET_OP_TEXT);
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mg_iobuf_del(&c->recv, 0, c->recv.len);
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}
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(void) fn_data;
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}
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static void timer_fn(void *arg) {
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struct mg_mgr *mgr = (struct mg_mgr *) arg;
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// Broadcast "hi" message to all connected websocket clients.
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// Traverse over all connections
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for (struct mg_connection *c = mgr->conns; c != NULL; c = c->next) {
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// Send only to marked connections
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if (c->data[0] == 'W') mg_ws_send(c, "hi", 2, WEBSOCKET_OP_TEXT);
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}
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}
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int main(void) {
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struct mg_mgr mgr; // Event manager
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mg_mgr_init(&mgr); // Initialise event manager
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mg_log_set(MG_LL_DEBUG); // Set log level
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mg_timer_add(&mgr, 1000, MG_TIMER_REPEAT, timer_fn, &mgr);
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mg_http_listen(&mgr, s_listen_on, fn, NULL); // Create HTTP listener
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for (;;) mg_mgr_poll(&mgr, 500); // Infinite event loop
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mg_mgr_free(&mgr); // Free manager resources
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return 0;
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}
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