/*
* Copyright (C) NGINX, Inc.
*/
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <nxt_unit.h>
#include <nxt_unit_request.h>
#include <nxt_clang.h>
#include <nxt_websocket.h>
#include <nxt_unit_websocket.h>
#include <nxt_main.h>
#define CONTENT_TYPE "Content-Type"
#define CONTENT_LENGTH "Content-Length"
#define TEXT_HTML "text/html"
typedef struct {
nxt_queue_link_t link;
int id;
} ws_chat_request_data_t;
static int ws_chat_root(nxt_unit_request_info_t *req);
static void ws_chat_broadcast(const char *buf, size_t size);
static const char ws_chat_index_html[];
static const int ws_chat_index_html_size;
static char ws_chat_index_content_length[34];
static int ws_chat_index_content_length_size;
static nxt_queue_t ws_chat_sessions;
static int ws_chat_next_id = 0;
static void
ws_chat_request_handler(nxt_unit_request_info_t *req)
{
static char buf[1024];
int buf_size;
int rc = NXT_UNIT_OK;
nxt_unit_request_t *r;
ws_chat_request_data_t *data;
r = req->request;
const char* target = nxt_unit_sptr_get(&r->target);
if (strcmp(target, "/") == 0) {
rc = ws_chat_root(req);
goto fail;
}
if (strcmp(target, "/chat") == 0) {
if (!nxt_unit_request_is_websocket_handshake(req)) {
goto notfound;
}
rc = nxt_unit_response_init(req, 101, 0, 0);
if (nxt_slow_path(rc != NXT_UNIT_OK)) {
goto fail;
}
data = req->data;
nxt_queue_insert_tail(&ws_chat_sessions, &data->link);
data->id = ws_chat_next_id++;
nxt_unit_response_upgrade(req);
nxt_unit_response_send(req);
buf_size = snprintf(buf, sizeof(buf), "Guest #%d has joined.", data->id);
ws_chat_broadcast(buf, buf_size);
return;
}
notfound:
rc = nxt_unit_response_init(req, 404, 0, 0);
fail:
nxt_unit_request_done(req, rc);
}
static int
ws_chat_root(nxt_unit_request_info_t *req)
{
int rc;
rc = nxt_unit_response_init(req, 200 /* Status code. */,
2 /* Number of response headers. */,
nxt_length(CONTENT_TYPE)
+ nxt_length(TEXT_HTML)
+ nxt_length(CONTENT_LENGTH)
+ ws_chat_index_content_length_size
+ ws_chat_index_html_size);
if (nxt_slow_path(rc != NXT_UNIT_OK)) {
return rc;
}
rc = nxt_unit_response_add_field(req,
CONTENT_TYPE, nxt_length(CONTENT_TYPE),
TEXT_HTML, nxt_length(TEXT_HTML));
if (nxt_slow_path(rc != NXT_UNIT_OK)) {
return rc;
}
rc = nxt_unit_response_add_field(req,
CONTENT_LENGTH, nxt_length(CONTENT_LENGTH),
ws_chat_index_content_length,
ws_chat_index_content_length_size);
if (nxt_slow_path(rc != NXT_UNIT_OK)) {
return rc;
}
rc = nxt_unit_response_add_content(req, ws_chat_index_html,
ws_chat_index_html_size);
if (nxt_slow_path(rc != NXT_UNIT_OK)) {
return rc;
}
return nxt_unit_response_send(req);
}
static void
ws_chat_broadcast(const char *buf, size_t size)
{
ws_chat_request_data_t *data;
nxt_unit_request_info_t *req;
nxt_unit_debug(NULL, "broadcast: %*.s", (int) size, buf);
nxt_queue_each(data, &ws_chat_sessions, ws_chat_request_data_t, link) {
req = nxt_unit_get_request_info_from_data(data);
nxt_unit_req_debug(req, "send: %*.s", (int) size, buf);
nxt_unit_websocket_send(req, NXT_WEBSOCKET_OP_TEXT, 1, buf, size);
} nxt_queue_loop;
}
static void
ws_chat_websocket_handler(nxt_unit_websocket_frame_t *ws)
{
int buf_size;
static char buf[1024];
ws_chat_request_data_t *data;
if (ws->header->opcode != NXT_WEBSOCKET_OP_TEXT) {
return;
}
data = ws->req->data;
buf_size = snprintf(buf, sizeof(buf), "Guest #%d: ", data->id);
buf_size += nxt_unit_websocket_read(ws, buf + buf_size,
nxt_min(sizeof(buf),
ws->content_length));
ws_chat_broadcast(buf, buf_size);
nxt_unit_websocket_done(ws);
}
static void
ws_chat_close_handler(nxt_unit_request_info_t *req)
{
int buf_size;
static char buf[1024];
ws_chat_request_data_t *data;
data = req->data;
buf_size = snprintf(buf, sizeof(buf), "Guest #%d has disconnected.",
data->id);
nxt_queue_remove(&data->link);
nxt_unit_request_done(req, NXT_UNIT_OK);
ws_chat_broadcast(buf, buf_size);
}
int
main(void)
{
nxt_unit_ctx_t *ctx;
nxt_unit_init_t init;
ws_chat_index_content_length_size =
snprintf(ws_chat_index_content_length,
sizeof(ws_chat_index_content_length), "%d",
ws_chat_index_html_size);
nxt_queue_init(&ws_chat_sessions);
memset(&init, 0, sizeof(nxt_unit_init_t));
init.callbacks.request_handler = ws_chat_request_handler;
init.callbacks.websocket_handler = ws_chat_websocket_handler;
init.callbacks.close_handler = ws_chat_close_handler;
init.request_data_size = sizeof(ws_chat_request_data_t);
ctx = nxt_unit_init(&init);
if (ctx == NULL) {
return 1;
}
nxt_unit_run(ctx);
nxt_unit_done(ctx);
return 0;
}
static const char ws_chat_index_html[] =
"<html>\n"
"<head>\n"
" <title>WebSocket Chat Examples</title>\n"
" <style type=\"text/css\">\n"
" input#chat {\n"
" width: 410px\n"
" }\n"
"\n"
" #container {\n"
" width: 400px;\n"
" }\n"
"\n"
" #console {\n"
" border: 1px solid #CCCCCC;\n"
" border-right-color: #999999;\n"
" border-bottom-color: #999999;\n"
" height: 170px;\n"
" overflow-y: scroll;\n"
" padding: 5px;\n"
" width: 100%;\n"
" }\n"
"\n"
" #console p {\n"
" padding: 0;\n"
" margin: 0;\n"
" }\n"
" </style>\n"
" <script>\n"
" \"use strict\";\n"
"\n"
" var Chat = {};\n"
"\n"
" Chat.socket = null;\n"
"\n"
" Chat.connect = (function(host) {\n"
" if ('WebSocket' in window) {\n"
" Chat.socket = new WebSocket(host);\n"
" } else if ('MozWebSocket' in window) {\n"
" Chat.socket = new MozWebSocket(host);\n"
" } else {\n"
" Console.log('Error: WebSocket is not supported by this browser.');\n"
" return;\n"
" }\n"
"\n"
" Chat.socket.onopen = function () {\n"
" Console.log('Info: WebSocket connection opened.');\n"
" document.getElementById('chat').onkeydown = function(event) {\n"
" if (event.keyCode == 13) {\n"
" Chat.sendMessage();\n"
" }\n"
" };\n"
" };\n"
"\n"
" Chat.socket.onclose = function () {\n"
" document.getElementById('chat').onkeydown = null;\n"
" Console.log('Info: WebSocket closed.');\n"
" };\n"
"\n"
" Chat.socket.onmessage = function (message) {\n"
" Console.log(message.data);\n"
" };\n"
" });\n"
"\n"
" Chat.initialize = function() {\n"
" var proto = 'ws://';\n"
" if (window.location.protocol == 'https:') {\n"
" proto = 'wss://'\n"
" }\n"
" Chat.connect(proto + window.location.host + '/chat');\n"
" };\n"
"\n"
" Chat.sendMessage = (function() {\n"
" var message = document.getElementById('chat').value;\n"
" if (message != '') {\n"
" Chat.socket.send(message);\n"
" document.getElementById('chat').value = '';\n"
" }\n"
" });\n"
"\n"
" var Console = {};\n"
"\n"
" Console.log = (function(message) {\n"
" var console = document.getElementById('console');\n"
" var p = document.createElement('p');\n"
" p.style.wordWrap = 'break-word';\n"
" p.innerHTML = message;\n"
" console.appendChild(p);\n"
" while (console.childNodes.length > 25) {\n"
" console.removeChild(console.firstChild);\n"
" }\n"
" console.scrollTop = console.scrollHeight;\n"
" });\n"
"\n"
" Chat.initialize();\n"
"\n"
" </script>\n"
"</head>\n"
"<body>\n"
"<noscript><h2 style=\"color: #ff0000\">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable\n"
" Javascript and reload this page!</h2></noscript>\n"
"<div>\n"
" <p><input type=\"text\" placeholder=\"type and press enter to chat\" id=\"chat\" /></p>\n"
" <div id=\"container\">\n"
" <div id=\"console\"/>\n"
" </div>\n"
"</div>\n"
"</body>\n"
"</html>\n"
;
static const int ws_chat_index_html_size = nxt_length(ws_chat_index_html);
