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#pragma once
#include "base/exception.hpp"
#include "base/scope_guard.hpp"
#include "base/stl_add.hpp"
#include "3party/jansson/myjansson.hpp"
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <memory>
#include <vector>
namespace coding
{
template<typename Sink>
class SerializerJson
{
public:
explicit SerializerJson(Sink & sink) : m_sink(sink) {}
virtual ~SerializerJson()
{
std::unique_ptr<char, JSONFreeDeleter> buffer(json_dumps(m_json.get(), 0));
m_sink.Write(buffer.get(), strlen(buffer.get()));
}
template <typename T>
void ToJsonObjectOrValue(T const & value, char const * name)
{
if (name != nullptr)
{
ToJSONObject(*m_json, name, value);
}
else if (json_is_array(m_json))
{
auto json = ToJSON(value);
json_array_append_new(m_json.get(), json.release());
}
else
{
ASSERT(false, ("Unsupported JSON structure"));
}
}
void operator()(bool const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(uint8_t const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(uint32_t const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(uint64_t const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(int64_t const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(double const d, char const * name = nullptr) { ToJsonObjectOrValue(d, name); }
void operator()(std::string const & s, char const * name = nullptr) { ToJsonObjectOrValue(s, name); }
template <typename T>
void operator()(std::vector<T> const & vs, char const * name = nullptr)
{
NewScopeWith(my::NewJSONArray(), name, [this, &vs] {
for (auto const & v : vs)
(*this)(v);
});
}
template <typename T>
void operator()(std::unordered_set<T> const & dest, char const * name = nullptr)
{
NewScopeWith(my::NewJSONArray(), name, [this, &dest] {
for (auto const & v : dest)
(*this)(v);
});
}
template <typename R>
void operator()(R const & r, char const * name = nullptr)
{
NewScopeWith(my::NewJSONObject(), name, [this, &r] { r.Visit(*this); });
}
template <typename R>
void operator()(std::unique_ptr<R> const & r, char const * name = nullptr)
{
NewScopeWith(my::NewJSONObject(), name, [this, &r] {
CHECK(r, ());
r->Visit(*this);
});
}
template <typename R>
void operator()(std::shared_ptr<R> const & r, char const * name = nullptr)
{
NewScopeWith(my::NewJSONObject(), name, [this, &r] {
CHECK(r, ());
r->Visit(*this);
});
}
protected:
template <typename Fn>
void NewScopeWith(my::JSONPtr json_object, char const * name, Fn && fn)
{
my::JSONPtr safe_json = std::move(m_json);
m_json = std::move(json_object);
auto rollback = [this, &safe_json, name]()
{
if (safe_json == nullptr)
return;
if (json_is_array(safe_json))
json_array_append_new(safe_json.get(), m_json.release());
else if (json_is_object(safe_json))
json_object_set_new(safe_json.get(), name, m_json.release());
m_json = std::move(safe_json);
};
MY_SCOPE_GUARD(rollbackJson, rollback);
fn();
}
my::JSONPtr m_json = nullptr;
Sink & m_sink;
};
class DeserializerJson
{
public:
DECLARE_EXCEPTION(Exception, RootException);
template <typename Source,
typename std::enable_if<!std::is_convertible<Source, std::string>::value,
Source>::type * = nullptr>
explicit DeserializerJson(Source & source)
{
std::string src(source.Size(), '\0');
source.Read(static_cast<void *>(&src[0]), source.Size());
m_jsonObject.ParseFrom(src);
m_json = m_jsonObject.get();
}
explicit DeserializerJson(std::string const & source)
: m_jsonObject(source), m_json(m_jsonObject.get())
{
}
explicit DeserializerJson(json_t * json) : m_json(json) {}
template <typename T>
void FromJsonObjectOrValue(T & s, char const * name)
{
if (name != nullptr)
FromJSONObject(m_json, name, s);
else
FromJSON(m_json, s);
}
void operator()(bool & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(uint8_t & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(uint32_t & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(uint64_t & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(int64_t & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(double & d, char const * name = nullptr) { FromJsonObjectOrValue(d, name); }
void operator()(std::string & s, char const * name = nullptr) { FromJsonObjectOrValue(s, name); }
template <typename T>
void operator()(std::vector<T> & vs, char const * name = nullptr)
{
json_t * outerContext = SaveContext(name);
if (!json_is_array(m_json))
MYTHROW(my::Json::Exception, ("The field", name, "must contain a json array."));
vs.resize(json_array_size(m_json));
for (size_t index = 0; index < vs.size(); ++index)
{
json_t * context = SaveContext();
m_json = json_array_get(context, index);
(*this)(vs[index]);
RestoreContext(context);
}
RestoreContext(outerContext);
}
template <typename T>
void operator()(std::unordered_set<T> & dest, char const * name = nullptr)
{
json_t * outerContext = SaveContext(name);
if (!json_is_array(m_json))
MYTHROW(my::Json::Exception, ("The field", name, "must contain a json array."));
T tmp;
size_t size = json_array_size(m_json);
dest.reserve(size);
for (size_t index = 0; index < size; ++index)
{
json_t * context = SaveContext();
m_json = json_array_get(context, index);
(*this)(tmp);
dest.insert(tmp);
RestoreContext(context);
}
RestoreContext(outerContext);
}
template <typename R>
void operator()(R & r, char const * name = nullptr)
{
json_t * context = SaveContext(name);
r.Visit(*this);
RestoreContext(context);
}
template <typename R>
void operator()(std::unique_ptr<R> & r, char const * name = nullptr)
{
json_t * context = SaveContext(name);
if (!r)
r = my::make_unique<R>();
r->Visit(*this);
RestoreContext(context);
}
template <typename R>
void operator()(std::shared_ptr<R> & r, char const * name = nullptr)
{
json_t * context = SaveContext(name);
if (!r)
r = std::make_shared<R>();
r->Visit(*this);
RestoreContext(context);
}
protected:
json_t * SaveContext(char const * name = nullptr)
{
json_t * context = m_json;
if (name)
m_json = my::GetJSONObligatoryField(context, name);
return context;
}
void RestoreContext(json_t * context)
{
if (context)
m_json = context;
}
my::Json m_jsonObject;
json_t * m_json = nullptr;
};
} // namespace coding
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