153 lines
5 KiB
C++
153 lines
5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_LOOLWEBSOCKET_HPP
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#define INCLUDED_LOOLWEBSOCKET_HPP
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#include <cstdlib>
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#include <mutex>
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#include <thread>
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#include <Poco/Net/WebSocket.h>
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#include <Common.hpp>
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#include <Protocol.hpp>
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#include <Log.hpp>
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/// WebSocket that is thread safe, and handles large frames transparently.
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/// Careful - sendFrame and receiveFrame are _not_ virtual,
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/// we need to make sure that we use LOOLWebSocket all over the place.
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/// It would be a kind of more natural to encapsulate Poco::Net::WebSocket
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/// instead of inheriting (from that reason,) but that would requite much
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/// larger code changes.
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class LOOLWebSocket : public Poco::Net::WebSocket
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{
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private:
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std::mutex _mutex;
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#ifdef ENABLE_DEBUG
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std::chrono::milliseconds getWebSocketDelay()
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{
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unsigned long baseDelay = WS_DELAY_MS;
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unsigned long jitter = WS_JITTER_MS;
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if (std::getenv("LOOL_WS_DELAY"))
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{
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baseDelay = std::stoul(std::getenv("LOOL_WS_DELAY"));
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}
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if (std::getenv("LOOL_WS_JITTER"))
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{
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jitter = std::stoul(std::getenv("LOOL_WS_JITTER"));
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}
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return std::chrono::milliseconds(baseDelay + (jitter > 0 ? (std::rand() % jitter) : 0));
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}
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#endif
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public:
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LOOLWebSocket(const Socket& socket) :
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Poco::Net::WebSocket(socket)
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{
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}
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LOOLWebSocket(Poco::Net::HTTPServerRequest& request,
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Poco::Net::HTTPServerResponse& response) :
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Poco::Net::WebSocket(request, response)
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{
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}
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LOOLWebSocket(Poco::Net::HTTPClientSession& cs,
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Poco::Net::HTTPRequest& request,
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Poco::Net::HTTPResponse& response) :
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Poco::Net::WebSocket(cs, request, response)
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{
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}
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LOOLWebSocket(Poco::Net::HTTPClientSession& cs,
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Poco::Net::HTTPRequest& request,
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Poco::Net::HTTPResponse& response,
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Poco::Net::HTTPCredentials& credentials) :
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Poco::Net::WebSocket(cs, request, response, credentials)
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{
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}
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/// Wrapper for Poco::Net::WebSocket::receiveFrame() that handles PING frames
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/// (by replying with a PONG frame) and PONG frames. PONG frames are ignored.
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/// Should we also factor out the handling of non-final and continuation frames into this?
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int receiveFrame(char* buffer, const int length, int& flags)
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{
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#ifdef ENABLE_DEBUG
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// Delay receiving the frame
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std::this_thread::sleep_for(getWebSocketDelay());
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#endif
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// Timeout given is in microseconds.
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static const Poco::Timespan waitTime(POLL_TIMEOUT_MS * 1000);
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while (poll(waitTime, Poco::Net::Socket::SELECT_READ))
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{
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const int n = Poco::Net::WebSocket::receiveFrame(buffer, length, flags);
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if ((flags & WebSocket::FRAME_OP_BITMASK) == WebSocket::FRAME_OP_PING)
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{
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sendFrame(buffer, n, WebSocket::FRAME_FLAG_FIN | WebSocket::FRAME_OP_PONG);
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}
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else if ((flags & WebSocket::FRAME_OP_BITMASK) == WebSocket::FRAME_OP_PONG)
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{
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// In case we do send pongs in the future.
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}
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else
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{
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return n;
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}
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}
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return -1;
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}
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/// Wrapper for Poco::Net::WebSocket::sendFrame() that handles large frames.
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int sendFrame(const char* buffer, const int length, const int flags = FRAME_TEXT)
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{
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#ifdef ENABLE_DEBUG
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// Delay sending the frame
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std::this_thread::sleep_for(getWebSocketDelay());
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#endif
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std::unique_lock<std::mutex> lock(_mutex);
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// Size after which messages will be sent preceded with
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// 'nextmessage' frame to let the receiver know in advance
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// the size of larger coming message. All messages up to this
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// size are considered small messages.
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constexpr int SMALL_MESSAGE_SIZE = READ_BUFFER_SIZE / 2;
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if (length > SMALL_MESSAGE_SIZE)
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{
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const std::string nextmessage = "nextmessage: size=" + std::to_string(length);
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Poco::Net::WebSocket::sendFrame(nextmessage.data(), nextmessage.size());
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Log::debug("Message is long, sent " + nextmessage);
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}
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const int result = Poco::Net::WebSocket::sendFrame(buffer, length, flags);
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lock.unlock();
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if (result != length)
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{
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LOG_ERR("Sent incomplete message, expected " << length << " bytes but sent " << result <<
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" while sending: " << LOOLProtocol::getAbbreviatedMessage(buffer, length));
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}
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else
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{
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LOG_DBG("Sent frame: " << LOOLProtocol::getAbbreviatedMessage(buffer, length));
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}
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return result;
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}
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};
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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