forked from townforge/townforge
185 lines
6.6 KiB
C++
185 lines
6.6 KiB
C++
// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the Andrey N. Sabelnikov nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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#ifndef _LEVIN_BASE_H_
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#define _LEVIN_BASE_H_
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#include <cstdint>
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#include "byte_stream.h"
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#include "net_utils_base.h"
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#include "span.h"
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#define LEVIN_SIGNATURE 0x0101010101012101LL //Bender's nightmare
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namespace epee
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{
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class byte_slice;
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namespace levin
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{
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#pragma pack(push)
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#pragma pack(1)
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struct bucket_head
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{
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uint64_t m_signature;
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uint64_t m_cb;
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bool m_have_to_return_data;
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uint32_t m_command;
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int32_t m_return_code;
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uint32_t m_reservedA; //probably some flags in future
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uint32_t m_reservedB; //probably some check sum in future
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};
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#pragma pack(pop)
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#pragma pack(push)
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#pragma pack(1)
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struct bucket_head2
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{
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uint64_t m_signature;
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uint64_t m_cb;
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bool m_have_to_return_data;
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uint32_t m_command;
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int32_t m_return_code;
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uint32_t m_flags;
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uint32_t m_protocol_version;
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};
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#pragma pack(pop)
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#define LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED 0
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#define LEVIN_INITIAL_MAX_PACKET_SIZE 256*1024 // 256 KiB before handshake
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#define LEVIN_DEFAULT_MAX_PACKET_SIZE 100000000 //100MB by default after handshake
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#define LEVIN_PACKET_REQUEST 0x00000001
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#define LEVIN_PACKET_RESPONSE 0x00000002
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#define LEVIN_PACKET_BEGIN 0x00000004
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#define LEVIN_PACKET_END 0x00000008
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#define LEVIN_PROTOCOL_VER_0 0
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#define LEVIN_PROTOCOL_VER_1 1
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template<class t_connection_context = net_utils::connection_context_base>
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struct levin_commands_handler
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{
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virtual int invoke(int command, const epee::span<const uint8_t> in_buff, byte_stream& buff_out, t_connection_context& context)=0;
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virtual int notify(int command, const epee::span<const uint8_t> in_buff, t_connection_context& context)=0;
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virtual void callback(t_connection_context& context){};
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virtual void on_connection_new(t_connection_context& context){};
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virtual void on_connection_close(t_connection_context& context){};
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virtual ~levin_commands_handler(){}
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};
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#define LEVIN_OK 0
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#define LEVIN_ERROR_CONNECTION -1
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#define LEVIN_ERROR_CONNECTION_NOT_FOUND -2
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#define LEVIN_ERROR_CONNECTION_DESTROYED -3
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#define LEVIN_ERROR_CONNECTION_TIMEDOUT -4
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#define LEVIN_ERROR_CONNECTION_NO_DUPLEX_PROTOCOL -5
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#define LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED -6
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#define LEVIN_ERROR_FORMAT -7
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#define DESCRIBE_RET_CODE(code) case code: return #code;
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inline
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const char* get_err_descr(int err)
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{
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switch(err)
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{
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DESCRIBE_RET_CODE(LEVIN_OK);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_NOT_FOUND);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_DESTROYED);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_TIMEDOUT);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_NO_DUPLEX_PROTOCOL);
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DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED);
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DESCRIBE_RET_CODE(LEVIN_ERROR_FORMAT);
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default:
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return "unknown code";
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}
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}
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//! Provides space for levin (p2p) header, so that payload can be sent without copy
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class message_writer
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{
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byte_slice finalize(uint32_t command, uint32_t flags, uint32_t return_code, bool expect_response);
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public:
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using header = bucket_head2;
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explicit message_writer(std::size_t reserve = 8192);
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message_writer(const message_writer&) = delete;
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message_writer(message_writer&&) = default;
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~message_writer() = default;
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message_writer& operator=(const message_writer&) = delete;
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message_writer& operator=(message_writer&&) = default;
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//! \return Size of payload (excludes header size).
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std::size_t payload_size() const noexcept
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{
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return buffer.size() < sizeof(header) ? 0 : buffer.size() - sizeof(header);
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}
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byte_slice finalize_invoke(uint32_t command) { return finalize(command, LEVIN_PACKET_REQUEST, 0, true); }
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byte_slice finalize_notify(uint32_t command) { return finalize(command, LEVIN_PACKET_REQUEST, 0, false); }
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byte_slice finalize_response(uint32_t command, uint32_t return_code)
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{
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return finalize(command, LEVIN_PACKET_RESPONSE, return_code, false);
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}
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//! Has space for levin header until a finalize method is used
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byte_stream buffer;
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};
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//! \return Intialized levin header.
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bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept;
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/*! Generate a dummy levin message.
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\param noise_bytes Total size of the returned `byte_slice`.
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\return `nullptr` if `noise_size` is smaller than the levin header.
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Otherwise, a dummy levin message. */
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byte_slice make_noise_notify(std::size_t noise_bytes);
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/*! Generate 1+ levin messages that are identical to the noise message size.
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\param noise_size Each levin message will be identical to this value.
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\return `nullptr` if `noise.size()` is less than the levin header size.
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Otherwise, a levin notification message OR 2+ levin fragment messages.
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Each message is `noise.size()` in length. */
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byte_slice make_fragmented_notify(const std::size_t noise_size, int command, message_writer message);
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}
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}
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#endif //_LEVIN_BASE_H_
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