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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_COMPRESSION_ONWIRE_H
#define CEPH_COMPRESSION_ONWIRE_H
#include <cstdint>
#include <optional>
#include "compressor/Compressor.h"
#include "include/buffer.h"
class CompConnectionMeta;
namespace ceph::compression::onwire {
using Compressor = TOPNSPC::Compressor;
using CompressorRef = TOPNSPC::CompressorRef;
class Handler {
public:
Handler(CephContext* const cct, CompressorRef compressor)
: m_cct(cct), m_compressor(compressor) {}
protected:
CephContext* const m_cct;
CompressorRef m_compressor;
};
class RxHandler final : private Handler {
public:
RxHandler(CephContext* const cct, CompressorRef compressor)
: Handler(cct, compressor) {}
~RxHandler() {};
/**
* Decompresses a bufferlist
*
* @param input compressed bufferlist
* @param out decompressed bufferlist
*
* @returns true on success, false on failure
*/
std::optional<ceph::bufferlist> decompress(const ceph::bufferlist &input);
};
class TxHandler final : private Handler {
public:
TxHandler(CephContext* const cct, CompressorRef compressor, int mode, std::uint64_t min_size)
: Handler(cct, compressor),
m_min_size(min_size),
m_mode(static_cast<Compressor::CompressionMode>(mode))
{}
~TxHandler() {}
void reset_handler(int num_segments, uint64_t size) {
m_init_onwire_size = size;
m_compress_potential = size;
m_onwire_size = 0;
}
void done();
/**
* Compresses a bufferlist
*
* @param input bufferlist to compress
* @param out compressed bufferlist
*
* @returns true on success, false on failure
*/
std::optional<ceph::bufferlist> compress(const ceph::bufferlist &input);
double get_ratio() const {
return get_initial_size() / (double) get_final_size();
}
uint64_t get_initial_size() const {
return m_init_onwire_size;
}
uint64_t get_final_size() const {
return m_onwire_size;
}
private:
uint64_t m_min_size;
Compressor::CompressionMode m_mode;
uint64_t m_init_onwire_size;
uint64_t m_onwire_size;
uint64_t m_compress_potential;
};
struct rxtx_t {
std::unique_ptr<RxHandler> rx;
std::unique_ptr<TxHandler> tx;
static rxtx_t create_handler_pair(
CephContext* ctx,
const CompConnectionMeta& comp_meta,
std::uint64_t compress_min_size);
};
}
#endif // CEPH_COMPRESSION_ONWIRE_H
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