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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#pragma once
#include <iostream>
#include <string>
#include <string_view>
#include "include/buffer_fwd.h"
#include "msg/Message.h"
namespace ceph {
class Formatter;
}
struct Dencoder {
virtual ~Dencoder() {}
virtual std::string decode(bufferlist bl, uint64_t seek) = 0;
virtual void encode(bufferlist& out, uint64_t features) = 0;
virtual void dump(ceph::Formatter *f) = 0;
virtual void copy() {
std::cerr << "copy operator= not supported" << std::endl;
}
virtual void copy_ctor() {
std::cerr << "copy ctor not supported" << std::endl;
}
virtual void generate() = 0;
virtual int num_generated() = 0;
virtual std::string select_generated(unsigned n) = 0;
virtual bool is_deterministic() = 0;
unsigned get_struct_v(bufferlist bl, uint64_t seek) const {
auto p = bl.cbegin(seek);
uint8_t struct_v = 0;
ceph::decode(struct_v, p);
return struct_v;
}
//virtual void print(ostream& out) = 0;
};
template<class T>
class DencoderBase : public Dencoder {
protected:
T* m_object;
list<T*> m_list;
bool stray_okay;
bool nondeterministic;
public:
DencoderBase(bool stray_okay, bool nondeterministic)
: m_object(new T),
stray_okay(stray_okay),
nondeterministic(nondeterministic) {}
~DencoderBase() override {
delete m_object;
}
std::string decode(bufferlist bl, uint64_t seek) override {
auto p = bl.cbegin();
p.seek(seek);
try {
using ceph::decode;
decode(*m_object, p);
}
catch (buffer::error& e) {
return e.what();
}
if (!stray_okay && !p.end()) {
ostringstream ss;
ss << "stray data at end of buffer, offset " << p.get_off();
return ss.str();
}
return {};
}
void encode(bufferlist& out, uint64_t features) override = 0;
void dump(ceph::Formatter *f) override {
m_object->dump(f);
}
void generate() override {
T::generate_test_instances(m_list);
}
int num_generated() override {
return m_list.size();
}
string select_generated(unsigned i) override {
// allow 0- or 1-based (by wrapping)
if (i == 0)
i = m_list.size();
if ((i == 0) || (i > m_list.size()))
return "invalid id for generated object";
m_object = *(std::next(m_list.begin(), i-1));
return string();
}
bool is_deterministic() override {
return !nondeterministic;
}
};
template<class T>
class DencoderImplNoFeatureNoCopy : public DencoderBase<T> {
public:
DencoderImplNoFeatureNoCopy(bool stray_ok, bool nondeterministic)
: DencoderBase<T>(stray_ok, nondeterministic) {}
void encode(bufferlist& out, uint64_t features) override {
out.clear();
using ceph::encode;
encode(*this->m_object, out);
}
};
template<class T>
class DencoderImplNoFeature : public DencoderImplNoFeatureNoCopy<T> {
public:
DencoderImplNoFeature(bool stray_ok, bool nondeterministic)
: DencoderImplNoFeatureNoCopy<T>(stray_ok, nondeterministic) {}
void copy() override {
T *n = new T;
*n = *this->m_object;
delete this->m_object;
this->m_object = n;
}
void copy_ctor() override {
T *n = new T(*this->m_object);
delete this->m_object;
this->m_object = n;
}
};
template<class T>
class DencoderImplFeaturefulNoCopy : public DencoderBase<T> {
public:
DencoderImplFeaturefulNoCopy(bool stray_ok, bool nondeterministic)
: DencoderBase<T>(stray_ok, nondeterministic) {}
void encode(bufferlist& out, uint64_t features) override {
out.clear();
using ceph::encode;
encode(*(this->m_object), out, features);
}
};
template<class T>
class DencoderImplFeatureful : public DencoderImplFeaturefulNoCopy<T> {
public:
DencoderImplFeatureful(bool stray_ok, bool nondeterministic)
: DencoderImplFeaturefulNoCopy<T>(stray_ok, nondeterministic) {}
void copy() override {
T *n = new T;
*n = *this->m_object;
delete this->m_object;
this->m_object = n;
}
void copy_ctor() override {
T *n = new T(*this->m_object);
delete this->m_object;
this->m_object = n;
}
};
template<class T>
class MessageDencoderImpl : public Dencoder {
ref_t<T> m_object;
list<ref_t<T>> m_list;
public:
MessageDencoderImpl() : m_object{make_message<T>()} {}
~MessageDencoderImpl() override {}
string decode(bufferlist bl, uint64_t seek) override {
auto p = bl.cbegin();
p.seek(seek);
try {
ref_t<Message> n(decode_message(g_ceph_context, 0, p), false);
if (!n)
throw std::runtime_error("failed to decode");
if (n->get_type() != m_object->get_type()) {
stringstream ss;
ss << "decoded type " << n->get_type() << " instead of expected " << m_object->get_type();
throw std::runtime_error(ss.str());
}
m_object = ref_cast<T>(n);
}
catch (buffer::error& e) {
return e.what();
}
if (!p.end()) {
ostringstream ss;
ss << "stray data at end of buffer, offset " << p.get_off();
return ss.str();
}
return string();
}
void encode(bufferlist& out, uint64_t features) override {
out.clear();
encode_message(m_object.get(), features, out);
}
void dump(ceph::Formatter *f) override {
m_object->dump(f);
}
void generate() override {
//T::generate_test_instances(m_list);
}
int num_generated() override {
return m_list.size();
}
string select_generated(unsigned i) override {
// allow 0- or 1-based (by wrapping)
if (i == 0)
i = m_list.size();
if ((i == 0) || (i > m_list.size()))
return "invalid id for generated object";
m_object = *(std::next(m_list.begin(), i-1));
return string();
}
bool is_deterministic() override {
return true;
}
//void print(ostream& out) {
//out << m_object << std::endl;
//}
};
class DencoderRegistry
{
using dencoders_t = std::map<std::string_view, Dencoder*>;
public:
dencoders_t& get() {
return dencoders;
}
void register_dencoder(std::string_view name, Dencoder* denc) {
dencoders.emplace(name, denc);
}
private:
dencoders_t dencoders;
};
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