103 lines
3.5 KiB
C++
103 lines
3.5 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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* Copyright the Collabora Online contributors.
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*
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* SPDX-License-Identifier: MPL-2.0
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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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#pragma once
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#include <memory>
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#include <net/Socket.hpp>
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/**
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* Implementation that builds a websocket like protocol from many
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* individual proxied HTTP requests back to back.
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*
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* we use a trivial framing: [T(ext)|B(inary)]<hex-serial->\n<hex-length>\n<content>\n
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*/
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class ProxyProtocolHandler : public ProtocolHandlerInterface
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{
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public:
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ProxyProtocolHandler() :
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_inSerial(0),
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_outSerial(0)
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{
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}
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virtual ~ProxyProtocolHandler() { }
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/// Will be called exactly once by setHandler
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void onConnect(const std::shared_ptr<StreamSocket>& /* socket */) override {}
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/// Called after successful socket reads.
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void handleIncomingMessage(SocketDisposition &/* disposition */) override;
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int getPollEvents(std::chrono::steady_clock::time_point /* now */,
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int64_t &/* timeoutMaxMs */) override;
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void checkTimeout(std::chrono::steady_clock::time_point /* now */) override
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{
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}
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void performWrites(std::size_t capacity) override;
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void onDisconnect() override
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{
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// connections & sockets come and go a lot.
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}
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public:
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/// Clear all external references
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void dispose() override { _msgHandler.reset(); }
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int sendTextMessage(const char *msg, const size_t len, bool flush = false) const override;
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int sendBinaryMessage(const char *data, const size_t len, bool flush = false) const override;
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void shutdown(bool goingAway = false, const std::string &statusMessage = "") override;
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void getIOStats(uint64_t &sent, uint64_t &recv) override;
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// don't duplicate ourselves for every socket
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void dumpState(std::ostream&) const override {}
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// instead do it centrally.
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void dumpProxyState(std::ostream& os);
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bool parseEmitIncoming(const std::shared_ptr<StreamSocket> &socket);
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void handleRequest(bool isWaiting, const std::shared_ptr<Socket> &socket);
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/// tell our handler we've received a close.
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void notifyDisconnected();
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private:
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std::shared_ptr<StreamSocket> popOutSocket();
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/// can we find anything to send back if we try ?
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bool slurpHasMessages(std::size_t capacity);
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int sendMessage(const char *msg, const size_t len, bool text, bool flush);
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bool flushQueueTo(const std::shared_ptr<StreamSocket> &socket);
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struct Message : public std::vector<char>
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{
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Message(const char *msg, const std::size_t len, bool text, uint64_t serial)
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{
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const char *type = text ? "T" : "B";
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insert(end(), type, type + 1);
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std::ostringstream os;
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os << std::hex << "0x" << serial << "\n0x" << len << '\n';
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const std::string str = os.str();
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insert(end(), str.c_str(), str.c_str() + str.size());
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insert(end(), msg, msg + len);
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constexpr const char *terminator = "\n";
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insert(end(), terminator, terminator + 1);
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}
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};
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/// queue things when we have no socket to hand.
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std::vector<std::shared_ptr<Message>> _writeQueue;
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std::vector<std::weak_ptr<StreamSocket>> _outSockets;
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uint64_t _inSerial;
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uint64_t _outSerial;
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};
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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