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chat_server.cpp
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#include <co_async/co_async.hpp>
#include <co_async/std.hpp>
using namespace co_async;
using namespace std::literals;
static auto index_html = R"html(<!DOCTYPE html>
<html>
<head>
<title>小彭老师在线聊天室 2.0</title>
<meta charset="UTF-8">
<style>
.message p {
margin: 3px;
}
div.message {
margin: 0px;
padding: 6px;
}
div.input-bar {
display: flex;
flex-direction: row;
margin-top: 10px;
}
.input-user {
flex: 1;
}
.input-content {
flex: 1;
}
.message-user {
color: #666666;
font-weight: 600;
}
.message-user.message-current-user {
color: #559966;
font-weight: 600;
}
.message-content {
color: #333333;
font-weight: 300;
}
.brief {
color: #444444;
font-weight: 300;
}
body {
display: flex;
justify-content: center;
}
#container {
max-width: 800px;
}
</style>
</head>
<body>
<div id="container">
<h1>小彭老师在线聊天室 2.0</h1>
<p class="brief">小彭老师自主研发的一款基于 WebSocket 的现代 C++ 全栈聊天服务器 | <a href="https://github.com/archibate/co_async">GitHub 仓库</a></p>
<div class="message-list" id="messages"></div>
<div class="input-bar">
<input class="input-user" type="text" id="user" placeholder="你的昵称"/>
<button class="login-button" id="login">登录</button>
<label class="message-user" hidden id="user-label" for="content"></label> <input hidden class="input-content" type="text" id="content" placeholder="输入你的消息..." autocomplete="off"/>
<button hidden class="send-button" id="send">发送</button>
</div>
</div>
<script src="https://unpkg.com/[email protected]/dist/jquery.min.js"></script>
<script>
var current_user = $("#user").val().trim();
function escapeHtml(unsafe) {
return unsafe
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'");
}
$(document).ready(function() {
var ws = new WebSocket("ws://127.0.0.1:8080/");
$("#login").click(function() {
var user = $("#user").val().trim();
if (user == '') {
alert("昵称不能为空");
return;
}
ws.send(JSON.stringify({type: 'LoginParams', object: {user}}));
$("#send").show();
$("#content").show();
$("#user-label").show();
$("#login").hide();
$("#user").hide();
$("#user-label").text(`${escapeHtml(user)}:`);
});
$("#send").click(function() {
var content = $("#content").val().trim();
if (content == '') {
alert("消息不能为空");
return;
}
$("#content").val('');
ws.send(JSON.stringify({type: 'SendParams', object: {content}}));
});
$("#content").keypress(function(event) {
if (event.keyCode === 13) {
$("#send").click();
}
});
ws.onerror = function (evt) {
console.log('发生错误:', evt);
$("#messages").append('<div class="message"><p class="message-user">系统提示:</p><p class="message-content">连接发生了错误<p></div>');
};
ws.onmessage = function (evt) {
console.log('收到消息:', evt.data);
var recvParams = JSON.parse(evt.data);
var message = recvParams.message;
var extra_class = '';
var user = $("#user").val().trim();
if (message.user == user)
extra_class = ' message-current-user';
$("#messages").append(`<div class="message"><p class="message-user${extra_class}">${escapeHtml(message.user)}:</p><p class="message-content">${escapeHtml(message.content)}<p></div>`);
}
ws.onclose = function (evt) {
console.log('关闭了:', evt);
$("#messages").append('<div class="message"><p class="message-user">系统提示:</p><p class="message-content">连接已关闭，请刷新重新登录<p></div>');
};
});
</script>
</body>
</html>)html"sv;
struct Message {
std::string user;
std::string content;
REFLECT(user, content);
};
struct SendParams {
std::string content;
REFLECT(content);
static constexpr const char *name = "SendParams";
};
struct RecvParams {
Message message;
REFLECT(message);
static constexpr const char *name = "RecvParams";
};
struct LoginParams {
std::string user;
REFLECT(user);
static constexpr const char *name = "LoginParams";
};
struct Room {
std::vector<Message> mMessages;
ConditionVariable mMessageUpdated;
};
static Room room;
static Task<Expected<>> roomPoller(WebSocket &ws) {
size_t lastSize = 0;
while (true) {
while (room.mMessages.size() <= lastSize) {
co_await co_await room.mMessageUpdated.wait();
}
for (size_t i = lastSize; i < room.mMessages.size(); ++i) {
if (ws.is_closing())
break;
RecvParams recvParams = {
.message = room.mMessages[i],
};
co_await co_await ws.send(json_encode(std::move(recvParams)));
}
lastSize = room.mMessages.size();
}
co_return {};
}
static Task<Expected<>> amain(std::string addr) {
co_await co_await stdio().putline("正在监听: "s + addr);
auto listener = co_await co_await listener_bind(co_await AddressResolver()
.host(addr).resolve_one());
HTTPServer server;
server.route("GET", "/", [](HTTPServer::IO &io) -> Task<Expected<>> {
if (auto ws = co_await websocket_server(io)) {
// 是升级的 ws:// 请求
co_await co_await stdio().putline("连接成功"sv);
std::string loginUser;
ws->on_message([&] (std::string const &data) -> Task<Expected<>> {
co_await co_await stdio().putline("收到消息: "s + data);
std::visit(overloaded{
[&] (SendParams &&sendParams) {
room.mMessages.push_back(Message{
.user = loginUser,
.content = std::move(sendParams.content),
});
room.mMessageUpdated.notify_all();
},
[&] (LoginParams &&loginParams) {
loginUser = loginParams.user;
},
}, co_await json_decode<std::variant<LoginParams, SendParams>>(data));
co_return {};
});
ws->on_close([&] () -> Task<Expected<>> {
co_await co_await stdio().putline("正在关闭连接"sv);
co_return {};
});
ws->on_pong([&] (std::chrono::steady_clock::duration dt) -> Task<Expected<>> {
co_await co_await stdio().putline("网络延迟: "s + to_string(
std::chrono::duration_cast<std::chrono::milliseconds>(dt).count()) + "ms"s);
co_return {};
});
co_await (co_await when_any_common(ws->start(), roomPoller(*ws))).value;
co_return {};
} else {
// 是普通 http:// 请求
co_await co_await HTTPServerUtils::make_ok_response(io, index_html);
co_return {};
}
});
while (true) {
if (auto income = co_await listener_accept(listener)) {
co_spawn(server.handle_http(std::move(*income)));
}
}
}
int main(int argc, char **argv) {
std::string addr = "http://127.0.0.1:8080";
if (argc > 1) {
addr = argv[1];
}
co_main(amain(addr));
return 0;
}