transmission/libtransmission/peer-io.h

369 lines
8.9 KiB
C++

// This file Copyright © 2007-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0), GPLv3 (SPDX: GPL-3.0),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#ifndef __TRANSMISSION__
#error only libtransmission should #include this header.
#endif
/**
***
**/
#include <cstddef> // size_t
#include <cstdint> // uintX_t
#include <ctime>
#include <memory>
#include <optional>
#include <string>
#include <utility> // std::make_pair
#include <event2/buffer.h>
#include "transmission.h"
#include "bandwidth.h"
#include "crypto.h"
#include "net.h" // tr_address
#include "peer-socket.h"
#include "tr-assert.h"
class tr_peerIo;
struct Bandwidth;
struct tr_datatype;
/**
* @addtogroup networked_io Networked IO
* @{
*/
enum ReadState
{
READ_NOW,
READ_LATER,
READ_ERR
};
enum tr_encryption_type
{
/* these match the values in MSE's crypto_select */
PEER_ENCRYPTION_NONE = (1 << 0),
PEER_ENCRYPTION_RC4 = (1 << 1)
};
using tr_can_read_cb = ReadState (*)(tr_peerIo* io, void* user_data, size_t* setme_piece_byte_count);
using tr_did_write_cb = void (*)(tr_peerIo* io, size_t bytesWritten, bool wasPieceData, void* userData);
using tr_net_error_cb = void (*)(tr_peerIo* io, short what, void* userData);
auto inline constexpr PEER_IO_MAGIC_NUMBER = 206745;
struct evbuffer_deleter
{
void operator()(struct evbuffer* buf) const noexcept
{
evbuffer_free(buf);
}
};
using tr_evbuffer_ptr = std::unique_ptr<evbuffer, evbuffer_deleter>;
class tr_peerIo
{
public:
tr_peerIo(
tr_session* session_in,
tr_sha1_digest_t const* torrent_hash,
bool is_incoming,
tr_address const& addr,
tr_port port,
bool is_seed,
time_t current_time)
: crypto{ torrent_hash, is_incoming }
, session{ session_in }
, time_created{ current_time }
, addr_{ addr }
, port_{ port }
, is_seed_{ is_seed }
{
}
[[nodiscard]] constexpr tr_address const& address() const noexcept
{
return addr_;
}
[[nodiscard]] constexpr std::pair<tr_address, tr_port> socketAddress() const noexcept
{
return std::make_pair(addr_, port_);
}
std::string addrStr() const;
[[nodiscard]] constexpr bool isIncoming() noexcept
{
return crypto.is_incoming;
}
[[nodiscard]] auto getReadBuffer() noexcept
{
return inbuf.get();
}
[[nodiscard]] auto hasBandwidthLeft(tr_direction dir) noexcept
{
return bandwidth->clamp(dir, 1024) > 0;
}
[[nodiscard]] auto getPieceSpeed_Bps(uint64_t now, tr_direction dir) noexcept
{
return bandwidth->getPieceSpeedBytesPerSecond(now, dir);
}
constexpr void enableFEXT(bool flag) noexcept
{
fast_extension_supported_ = flag;
}
[[nodiscard]] constexpr auto supportsFEXT() const noexcept
{
return fast_extension_supported_;
}
constexpr void enableLTEP(bool flag) noexcept
{
extended_protocol_supported_ = flag;
}
[[nodiscard]] constexpr auto supportsLTEP() const noexcept
{
return extended_protocol_supported_;
}
constexpr void enableDHT(bool flag) noexcept
{
dht_supported_ = flag;
}
[[nodiscard]] constexpr auto supportsDHT() const noexcept
{
return dht_supported_;
}
[[nodiscard]] constexpr auto supportsUTP() const noexcept
{
return utp_supported_;
}
[[nodiscard]] constexpr auto isSeed() const noexcept
{
return is_seed_;
}
tr_crypto crypto;
// TODO(ckerr): yikes, unlike other class' magic_numbers it looks
// like this one isn't being used just for assertions, but also in
// didWriteWrapper() to see if the tr_peerIo got freed during the
// notify-consumed events. Fix this before removing this field.
int magic_number = PEER_IO_MAGIC_NUMBER;
struct tr_peer_socket socket = {};
tr_session* const session;
time_t const time_created;
tr_can_read_cb canRead = nullptr;
tr_did_write_cb didWrite = nullptr;
tr_net_error_cb gotError = nullptr;
void* userData = nullptr;
// Changed to non-owning pointer temporarily till tr_peerIo becomes C++-constructible and destructible
// TODO: change tr_bandwidth* to owning pointer to the bandwidth, or remove * and own the value
Bandwidth* bandwidth = nullptr;
tr_evbuffer_ptr const inbuf = tr_evbuffer_ptr{ evbuffer_new() };
tr_evbuffer_ptr const outbuf = tr_evbuffer_ptr{ evbuffer_new() };
struct tr_datatype* outbuf_datatypes = nullptr;
struct event* event_read = nullptr;
struct event* event_write = nullptr;
// TODO(ckerr): this could be narrowed to 1 byte
tr_encryption_type encryption_type = PEER_ENCRYPTION_NONE;
// TODO: use std::shared_ptr instead of manual refcounting?
int refCount = 1;
short int pendingEvents = 0;
tr_priority_t priority = TR_PRI_NORMAL;
bool utp_supported_ = false;
private:
tr_address const addr_;
tr_port const port_;
bool const is_seed_;
bool dht_supported_ = false;
bool extended_protocol_supported_ = false;
bool fast_extension_supported_ = false;
};
/**
***
**/
// TODO: 8 constructor args is too many; maybe a builder object?
tr_peerIo* tr_peerIoNewOutgoing(
tr_session* session,
Bandwidth* parent,
struct tr_address const* addr,
tr_port port,
time_t current_time,
tr_sha1_digest_t const& torrent_hash,
bool is_seed,
bool utp);
tr_peerIo* tr_peerIoNewIncoming(
tr_session* session,
Bandwidth* parent,
struct tr_address const* addr,
tr_port port,
time_t current_time,
struct tr_peer_socket const socket);
void tr_peerIoRefImpl(char const* file, int line, tr_peerIo* io);
#define tr_peerIoRef(io) tr_peerIoRefImpl(__FILE__, __LINE__, (io))
void tr_peerIoUnrefImpl(char const* file, int line, tr_peerIo* io);
#define tr_peerIoUnref(io) tr_peerIoUnrefImpl(__FILE__, __LINE__, (io))
constexpr bool tr_isPeerIo(tr_peerIo const* io)
{
return io != nullptr && io->magic_number == PEER_IO_MAGIC_NUMBER && io->refCount >= 0 &&
tr_address_is_valid(&io->address());
}
/**
***
**/
constexpr tr_session* tr_peerIoGetSession(tr_peerIo* io)
{
TR_ASSERT(tr_isPeerIo(io));
TR_ASSERT(io->session != nullptr);
return io->session;
}
std::optional<tr_sha1_digest_t> tr_peerIoGetTorrentHash(tr_peerIo const* io);
void tr_peerIoSetTorrentHash(tr_peerIo* io, tr_sha1_digest_t const& info_hash);
int tr_peerIoReconnect(tr_peerIo* io);
/**
***
**/
void tr_peerIoSetIOFuncs(tr_peerIo* io, tr_can_read_cb readcb, tr_did_write_cb writecb, tr_net_error_cb errcb, void* user_data);
void tr_peerIoClear(tr_peerIo* io);
/**
***
**/
void tr_peerIoWriteBytes(tr_peerIo* io, void const* writeme, size_t writemeLen, bool isPieceData);
void tr_peerIoWriteBuf(tr_peerIo* io, struct evbuffer* buf, bool isPieceData);
/**
***
**/
constexpr tr_crypto* tr_peerIoGetCrypto(tr_peerIo* io)
{
return &io->crypto;
}
void tr_peerIoSetEncryption(tr_peerIo* io, tr_encryption_type encryption_type);
constexpr bool tr_peerIoIsEncrypted(tr_peerIo const* io)
{
return io != nullptr && io->encryption_type == PEER_ENCRYPTION_RC4;
}
void evbuffer_add_uint8(struct evbuffer* outbuf, uint8_t byte);
void evbuffer_add_uint16(struct evbuffer* outbuf, uint16_t hs);
void evbuffer_add_uint32(struct evbuffer* outbuf, uint32_t hl);
void evbuffer_add_uint64(struct evbuffer* outbuf, uint64_t hll);
static inline void evbuffer_add_hton_16(struct evbuffer* buf, uint16_t val)
{
evbuffer_add_uint16(buf, val);
}
static inline void evbuffer_add_hton_32(struct evbuffer* buf, uint32_t val)
{
evbuffer_add_uint32(buf, val);
}
static inline void evbuffer_add_hton_64(struct evbuffer* buf, uint64_t val)
{
evbuffer_add_uint64(buf, val);
}
void tr_peerIoReadBytesToBuf(tr_peerIo* io, struct evbuffer* inbuf, struct evbuffer* outbuf, size_t byteCount);
void tr_peerIoReadBytes(tr_peerIo* io, struct evbuffer* inbuf, void* bytes, size_t byteCount);
static inline void tr_peerIoReadUint8(tr_peerIo* io, struct evbuffer* inbuf, uint8_t* setme)
{
tr_peerIoReadBytes(io, inbuf, setme, sizeof(uint8_t));
}
void tr_peerIoReadUint16(tr_peerIo* io, struct evbuffer* inbuf, uint16_t* setme);
void tr_peerIoReadUint32(tr_peerIo* io, struct evbuffer* inbuf, uint32_t* setme);
void tr_peerIoDrain(tr_peerIo* io, struct evbuffer* inbuf, size_t byteCount);
/**
***
**/
size_t tr_peerIoGetWriteBufferSpace(tr_peerIo const* io, uint64_t now);
static inline void tr_peerIoSetParent(tr_peerIo* io, Bandwidth* parent)
{
TR_ASSERT(tr_isPeerIo(io));
io->bandwidth->setParent(parent);
}
void tr_peerIoBandwidthUsed(tr_peerIo* io, tr_direction direction, size_t byteCount, int isPieceData);
/**
***
**/
void tr_peerIoSetEnabled(tr_peerIo* io, tr_direction dir, bool isEnabled);
int tr_peerIoFlush(tr_peerIo* io, tr_direction dir, size_t byteLimit);
int tr_peerIoFlushOutgoingProtocolMsgs(tr_peerIo* io);
/* @} */