// SPDX-License-Identifier: Apache-2.0
/*
Copyright (C) 2023 The Falco Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

*/

#include <libsinsp/plugin.h>

#define __CATCH_ERR_MSG(_ERR, _F) \
{ \
	try { _F; } \
	catch (const std::exception& _e) { _ERR = _e.what(); } \
	catch (...) { _ERR = "unknown error"; } \
}

#define __PLUGIN_STATETYPE_SWITCH(_kt) \
{ \
	switch (_kt) \
	{ \
		case ss_plugin_state_type::SS_PLUGIN_ST_INT8: \
			_X(int8_t, s8); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_INT16: \
			_X(int16_t, s16); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_INT32: \
			_X(int32_t, s32); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_INT64: \
			_X(int64_t, s64); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_UINT8: \
			_X(uint8_t, u8); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_UINT16: \
			_X(uint16_t, u16); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_UINT32: \
			_X(uint32_t, u32); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_UINT64: \
			_X(uint64_t, u64); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_STRING: \
			_X(std::string, str); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_BOOL: \
			_X(bool, b); break; \
		case ss_plugin_state_type::SS_PLUGIN_ST_TABLE: \
			_X(libsinsp::state::base_table*, table); break; \
		default: \
			throw sinsp_exception("can't convert plugin state type to typeinfo: " + std::to_string(_kt)); \
	} \
}

static inline ss_plugin_state_type typeinfo_to_state_type(const libsinsp::state::typeinfo& i)
{
	switch(i.index())
	{
		case libsinsp::state::typeinfo::index_t::TI_INT8:
			return ss_plugin_state_type::SS_PLUGIN_ST_INT8;
		case libsinsp::state::typeinfo::index_t::TI_INT16:
			return ss_plugin_state_type::SS_PLUGIN_ST_INT16;
		case libsinsp::state::typeinfo::index_t::TI_INT32:
			return ss_plugin_state_type::SS_PLUGIN_ST_INT32;
		case libsinsp::state::typeinfo::index_t::TI_INT64:
			return ss_plugin_state_type::SS_PLUGIN_ST_INT64;
		case libsinsp::state::typeinfo::index_t::TI_UINT8:
			return ss_plugin_state_type::SS_PLUGIN_ST_UINT8;
		case libsinsp::state::typeinfo::index_t::TI_UINT16:
			return ss_plugin_state_type::SS_PLUGIN_ST_UINT16;
		case libsinsp::state::typeinfo::index_t::TI_UINT32:
			return ss_plugin_state_type::SS_PLUGIN_ST_UINT32;
		case libsinsp::state::typeinfo::index_t::TI_UINT64:
			return ss_plugin_state_type::SS_PLUGIN_ST_UINT64;
		case libsinsp::state::typeinfo::index_t::TI_STRING:
			return ss_plugin_state_type::SS_PLUGIN_ST_STRING;
		case libsinsp::state::typeinfo::index_t::TI_BOOL:
			return ss_plugin_state_type::SS_PLUGIN_ST_BOOL;
		case libsinsp::state::typeinfo::index_t::TI_TABLE:
			return ss_plugin_state_type::SS_PLUGIN_ST_TABLE;
		default:
			throw sinsp_exception("can't convert typeinfo to plugin state type: " + std::to_string(i.index()));
	}
}

template<typename From, typename To> static inline void convert_types(const From& from, To& to)
{
	to = from;
}

// special cases for strings
template<> inline void convert_types(const std::string& from, const char*& to)
{
	to = from.c_str();
}

template<> inline void convert_types(libsinsp::state::base_table* const& from, ss_plugin_table_t*& to)
{
	to = static_cast<ss_plugin_table_t*>(from);
}

template<> inline void convert_types(ss_plugin_table_t* const& from, libsinsp::state::base_table*& to)
{
	to = static_cast<libsinsp::state::base_table*>(from);
}

static void noop_release_table_entry(ss_plugin_table_t*, ss_plugin_table_entry_t*)
{
}

static ss_plugin_bool noop_iterate_entries(ss_plugin_table_t*, ss_plugin_table_iterator_func_t, ss_plugin_table_iterator_state_t*)
{
	return 0;
}

struct owned_table_input_deleter
{
	void operator()(ss_plugin_table_input* in)
	{
		delete in->reader_ext;
		delete in->writer_ext;
		delete in->fields_ext;
		delete in;
	}
};

using owned_table_input_t = std::shared_ptr<ss_plugin_table_input>;

// note(jasondellaluce): here we assume that the api version has major number v3
// todo(jasondellaluce): update the repairing logic and safety checks
// when switching to a v4 minor/major plugin API version
static inline owned_table_input_t copy_and_check_table_input(const sinsp_plugin* p, const ss_plugin_table_input* in)
{
	std::string errprefix = "failure in adding state table defined by plugin '" + p->name() + "': ";
	if (!in)
	{
		throw sinsp_exception(errprefix + "input is null");
	}
	if (!in->name)
	{
		throw sinsp_exception(errprefix + "name is null");
	}

	owned_table_input_t res(
		new ss_plugin_table_input(), owned_table_input_deleter());
	res->name = in->name;
	res->key_type = in->key_type;
	res->table = in->table;
	res->reader = in->reader;
	res->writer = in->writer;
	res->fields = in->fields;

	// note: before minor v1, we didn't have the "extended" vtables for state tables,
	// so we need to recreate them from the information we had available before,
	// plus adding "no-op" implementations of all the functions not available before v1
	res->reader_ext = new ss_plugin_table_reader_vtable_ext();
	res->writer_ext = new ss_plugin_table_writer_vtable_ext();
	res->fields_ext = new ss_plugin_table_fields_vtable_ext();
	if (p->required_api_version().minor() < 1)
	{
		res->reader_ext->get_table_name = res->reader.get_table_name;
		res->reader_ext->get_table_size = res->reader.get_table_size;
		res->reader_ext->get_table_entry = res->reader.get_table_entry;
		res->reader_ext->read_entry_field = res->reader.read_entry_field;
		res->reader_ext->release_table_entry = noop_release_table_entry;
		res->reader_ext->iterate_entries = noop_iterate_entries;

		res->writer_ext->clear_table = res->writer.clear_table;
		res->writer_ext->erase_table_entry = res->writer.erase_table_entry;
		res->writer_ext->create_table_entry = res->writer.create_table_entry;
		res->writer_ext->destroy_table_entry = res->writer.destroy_table_entry;
		res->writer_ext->add_table_entry = res->writer.add_table_entry;
		res->writer_ext->write_entry_field = res->writer.write_entry_field;

		res->fields_ext->list_table_fields = res->fields.list_table_fields;
		res->fields_ext->get_table_field = res->fields.get_table_field;
		res->fields_ext->add_table_field = res->fields.add_table_field;
	}
	else
	{
		if (!in->reader_ext || !in->writer_ext || !in->fields_ext)
		{
			throw sinsp_exception(errprefix + "extended vtables must all be defined");
		}

		res->reader_ext->get_table_name = in->reader_ext->get_table_name;
		res->reader_ext->get_table_size = in->reader_ext->get_table_size;
		res->reader_ext->get_table_entry = in->reader_ext->get_table_entry;
		res->reader_ext->read_entry_field = in->reader_ext->read_entry_field;
		res->reader_ext->release_table_entry = in->reader_ext->release_table_entry;
		res->reader_ext->iterate_entries = in->reader_ext->iterate_entries;

		res->writer_ext->clear_table = in->writer_ext->clear_table;
		res->writer_ext->erase_table_entry = in->writer_ext->erase_table_entry;
		res->writer_ext->create_table_entry = in->writer_ext->create_table_entry;
		res->writer_ext->destroy_table_entry = in->writer_ext->destroy_table_entry;
		res->writer_ext->add_table_entry = in->writer_ext->add_table_entry;
		res->writer_ext->write_entry_field = in->writer_ext->write_entry_field;

		res->fields_ext->list_table_fields = in->fields_ext->list_table_fields;
		res->fields_ext->get_table_field = in->fields_ext->get_table_field;
		res->fields_ext->add_table_field = in->fields_ext->add_table_field;
	}

	if ((!res->reader_ext->get_table_name || res->reader_ext->get_table_name != res->reader.get_table_name) ||
		(!res->reader_ext->get_table_size || res->reader_ext->get_table_size != res->reader.get_table_size) ||
		(!res->reader_ext->get_table_entry || res->reader_ext->get_table_entry != res->reader.get_table_entry) ||
		(!res->reader_ext->read_entry_field || res->reader_ext->read_entry_field != res->reader.read_entry_field) ||
		!res->reader_ext->release_table_entry ||
		!res->reader_ext->iterate_entries)
	{
		throw sinsp_exception(errprefix + "broken or inconsistent reader vtables");
	}

	if((!res->writer_ext->clear_table || res->writer_ext->clear_table != res->writer.clear_table) ||
		(!res->writer_ext->erase_table_entry || res->writer_ext->erase_table_entry != res->writer.erase_table_entry) ||
		(!res->writer_ext->create_table_entry || res->writer_ext->create_table_entry != res->writer.create_table_entry) ||
		(!res->writer_ext->destroy_table_entry || res->writer_ext->destroy_table_entry != res->writer.destroy_table_entry) ||
		(!res->writer_ext->add_table_entry || res->writer_ext->add_table_entry != res->writer.add_table_entry) ||
		(!res->writer_ext->write_entry_field || res->writer_ext->write_entry_field != res->writer.write_entry_field))
	{
		throw sinsp_exception(errprefix + "broken or inconsistent writer vtables");
	}

	if((!res->fields_ext->list_table_fields || res->fields_ext->list_table_fields != res->fields.list_table_fields) ||
		(!res->fields_ext->get_table_field || res->fields_ext->get_table_field != res->fields.get_table_field) ||
		(!res->fields_ext->add_table_field || res->fields_ext->add_table_field != res->fields.add_table_field))
	{
		throw sinsp_exception(errprefix + "broken or inconsistent fields vtables");
	}

	return res;
}

static inline std::string table_input_error_prefix(const sinsp_plugin* o, ss_plugin_table_input* i)
{
	return "error in state table '" + std::string(i->name) + "' defined by plugin '" + o->name() + "': ";
}

static const libsinsp::state::static_struct::field_infos s_empty_static_infos;

// wraps instances of ss_plugin_table_input and makes them comply
// to the libsinsp::state::table state tables definition.
template <typename KeyType>
struct plugin_table_wrapper: public libsinsp::state::table<KeyType>
{
	using ss = libsinsp::state::static_struct;

	using ds = libsinsp::state::dynamic_struct;
	
	struct plugin_field_infos: public ds::field_infos
	{
		plugin_field_infos(
			const sinsp_plugin* o,
			const owned_table_input_t& i)
				: field_infos(), m_owner(o), m_input(i), m_accessors() {};
		plugin_field_infos(plugin_field_infos&&) = default;
		plugin_field_infos& operator = (plugin_field_infos&&) = default;
		plugin_field_infos(const plugin_field_infos& s) = delete;
		plugin_field_infos& operator = (const plugin_field_infos& s) = delete;
		virtual ~plugin_field_infos() = default;

		const sinsp_plugin* m_owner;
		owned_table_input_t m_input;
		std::vector<ss_plugin_table_field_t*> m_accessors;

		virtual const std::unordered_map<std::string, ds::field_info>& fields() override
		{
			// list all the fields of the plugin table
			uint32_t nfields = 0;
			auto res = m_input->fields_ext->list_table_fields(m_input->table, &nfields);
			if (res == NULL)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "list fields failure: " + m_owner->get_last_error());
			}

			// if there's a different number of fields that in our local copy,
			// we re-add all of them. Duplicate definitions will be skipped
			// anyways. Note, we set the index of each field info to the order
			// index of the first time we received it from the plugin. This is
			// relevant because the plugin API does not give guarantees about
			// order stability of the returned array of field infos.
			if (nfields != ds::field_infos::fields().size())
			{
				for (uint32_t i = 0; i < nfields; i++)
				{
					ds::field_info f;
					#define _X(_type, _dtype) \
					{ \
						f = ds::field_info::build<_type>(res[i].name, i, (uintptr_t) this, res[i].read_only); \
					}
					__PLUGIN_STATETYPE_SWITCH(res[i].field_type);
					#undef _X
					ds::field_infos::add_field_info(f);
				}
			}

			// at this point, our local copy of the field infos should be consistent
			// with what's known by the plugin. So, we make sure we create an
			// accessor for each of the field infos. Note, each field is associated
			// an accessor that has an array position equal to the field's index.
			// This will be used later for instant retrieval of the accessors
			// during read-write operations.
			const auto& ret = ds::field_infos::fields();
			for (const auto& it : ret)
			{
				const auto& f = it.second;
				while (m_accessors.size() <= f.index())
				{
					m_accessors.push_back(nullptr);
				}
				if (m_accessors[f.index()] == nullptr)
				{
					auto facc = m_input->fields_ext->get_table_field(m_input->table, f.name().c_str(), typeinfo_to_state_type(f.info()));
					if (facc == NULL)
					{
						throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "get table field failure: " + m_owner->get_last_error());
					}
					m_accessors[f.index()] = facc;
				}
			}
			return ret;
		}

		virtual const ds::field_info& add_field_info(const ds::field_info& field) override
		{
			auto ret = m_input->fields_ext->add_table_field(m_input->table, field.name().c_str(), typeinfo_to_state_type(field.info()));
			if (ret == NULL)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "add table field failure: " + m_owner->get_last_error());
			}

			// after adding a new field, we retrieve the whole list again
			// to trigger the local copy updates and make sure we're in a
			// consistent state. This is necessary because we we add a field,
			// we have no guarantee that other components haven't added other
			// fields too and we need to get their info as well.
			this->fields();

			// lastly, we leverage the base-class implementation to obtain
			// a reference from our local field definitions copy.
			return ds::field_infos::add_field_info(field);
		}
	};

	struct plugin_table_entry: public libsinsp::state::table_entry
	{		
		plugin_table_entry(
			sinsp_plugin* o,
			const owned_table_input_t& i,
			const std::shared_ptr<plugin_field_infos>& fields,
			ss_plugin_table_entry_t* e,
			bool detached):
				table_entry(fields),
				m_owner(o),
				m_input(i),
				m_entry(e),
				m_detached(detached) {};
		plugin_table_entry(const plugin_table_entry& o) = delete;
		plugin_table_entry& operator = (const plugin_table_entry& o) = delete;
		plugin_table_entry(plugin_table_entry&& o) = default;
		plugin_table_entry& operator = (plugin_table_entry&& o) = default;
		virtual ~plugin_table_entry()
		{
			if (m_entry)
			{
				if (m_detached)
				{
					m_input->writer_ext->destroy_table_entry(m_input->table, m_entry);
				}
				else
				{
					m_input->reader_ext->release_table_entry(m_input->table, m_entry);
				}
			}
		}

		sinsp_plugin* m_owner;
		owned_table_input_t m_input;
		ss_plugin_table_entry_t* m_entry;
		bool m_detached;

		// note(jasondellaluce): dynamic cast is expensive but this is not expected
		// to ever be ever invoked, because we set the fields shared pointer
		// at construction time. This is just here as a consistency fence in
		// case of misuse.
		virtual void set_dynamic_fields(const std::shared_ptr<ds::field_infos>& defs) override
		{
			if (defs && dynamic_cast<plugin_field_infos*>(defs.get()) == nullptr)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "plugin table can only be set with plugin dynamic fields");
			}
			table_entry::set_dynamic_fields(defs);
		}

		virtual void get_dynamic_field(const ds::field_info& i, void* out) override
		{
			if (i.info().index() == libsinsp::state::typeinfo::index_t::TI_TABLE)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "read field failure: dynamic table fields not supported");
			}
			const auto& infos = get_plugin_field_infos();
			ss_plugin_state_data dout;
			auto rc = m_input->reader_ext->read_entry_field(m_input->table, m_entry, infos.m_accessors[i.index()], &dout);
			if (rc != SS_PLUGIN_SUCCESS)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "read field failure: " + m_owner->get_last_error());
			}

			// note: strings are the only exception to the switch case below,
			// because they are represented as std::string in libsinsp' typeinfo
			// and as const char*s by the plugin API.
			// todo(jasondellaluce): maybe find a common place for all this
			// type conversions knowledge (also leaked in dynamic_struct.h)
			if (i.info().index() == libsinsp::state::typeinfo::index_t::TI_STRING)
			{
				*(const char**) out = dout.str;
			}
			else
			{
				#define _X(_type, _dtype) \
				{ \
					convert_types(dout._dtype, *((_type*) out)); \
				}
				__PLUGIN_STATETYPE_SWITCH(typeinfo_to_state_type(i.info()));
				#undef _X
			}
		}

		virtual void set_dynamic_field(const ds::field_info& i, const void* in) override
		{
			const auto& infos = get_plugin_field_infos();
			ss_plugin_state_data v;

			// note: strings are the only exception to the switch case below,
			// because they are represented as std::string in libsinsp' typeinfo
			// and as const char*s by the plugin API.
			// todo(jasondellaluce): maybe find a common place for all this
			// type conversions knowledge (also leaked in dynamic_struct.h)
			if (i.info().index() == libsinsp::state::typeinfo::index_t::TI_STRING)
			{
				v.str = *(const char**) in;
			}
			else
			{
				#define _X(_type, _dtype) \
				{ \
					convert_types(*((_type*) in), v._dtype); \
				}
				__PLUGIN_STATETYPE_SWITCH(typeinfo_to_state_type(i.info()));
				#undef _X
			}

			auto rc = m_input->writer_ext->write_entry_field(m_input->table, m_entry, infos.m_accessors[i.index()], &v);
			if (rc != SS_PLUGIN_SUCCESS)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "write field failure: " + m_owner->get_last_error());
			}
		}
	private:
		const plugin_field_infos& get_plugin_field_infos() const
		{
			if (dynamic_fields() == nullptr)
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "local fields definitions not set");
			}
			// note: casting should be safe because we force the
			// plugin_field_infos subtype both the constructor and the setter
			ASSERT(dynamic_cast<plugin_field_infos*>(dynamic_fields().get()) != nullptr);
			return *static_cast<plugin_field_infos*>(dynamic_fields().get());
		}
	};

	plugin_table_wrapper(sinsp_plugin* o, const ss_plugin_table_input* i)
		: libsinsp::state::table<KeyType>(i->name, &s_empty_static_infos),
		  m_owner(o),
		  m_input(copy_and_check_table_input(o, i)),
		  m_dyn_fields(std::make_shared<plugin_field_infos>(o, m_input))
	{
		auto t = libsinsp::state::typeinfo::of<KeyType>();
		if (m_input->key_type != typeinfo_to_state_type(t))
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "invalid key type: " + std::string(t.name()));
		}
	}

	virtual ~plugin_table_wrapper() = default;
	plugin_table_wrapper(plugin_table_wrapper&&) = default;
	plugin_table_wrapper& operator = (plugin_table_wrapper&&) = default;
	plugin_table_wrapper(const plugin_table_wrapper& s) = delete;
	plugin_table_wrapper& operator = (const plugin_table_wrapper& s) = delete;

	sinsp_plugin* m_owner;
	owned_table_input_t m_input;
	std::shared_ptr<plugin_field_infos> m_dyn_fields;

	const libsinsp::state::static_struct::field_infos* static_fields() const override
	{
		// note: always empty, plugin-defined table have no "static" fields,
		// all of them are dynamically-discovered at runtime
		return &s_empty_static_infos;
	}

	std::shared_ptr<ds::field_infos> dynamic_fields() const override
	{
		return m_dyn_fields;
	}

	size_t entries_count() const override
	{
		auto res = m_input->reader_ext->get_table_size(m_input->table);
		if (res == (uint64_t) -1)
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "get size failure: " + m_owner->get_last_error());
		}
		return (size_t) res;
	}

	void clear_entries() override
	{
		auto res = m_input->writer_ext->clear_table(m_input->table);
		if (res != SS_PLUGIN_SUCCESS)
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "clear entries failure: " + m_owner->get_last_error());
		}
	}

	// used only for foreach_entry below
	struct table_iterator_state
	{
		std::string err;
		plugin_table_entry* m_entry;
		std::function<bool(libsinsp::state::table_entry&)>* m_it;
	};

	// used only for foreach_entry below
	static ss_plugin_bool table_iterator_func(ss_plugin_table_iterator_state_t *s, ss_plugin_table_entry_t *_e)
	{
		auto state = static_cast<table_iterator_state*>(s);
		state->m_entry->m_entry = _e;
		__CATCH_ERR_MSG(state->err, {
			return (*state->m_it)(*state->m_entry) ? 1 : 0;
		});
		return 0;
	}

	bool foreach_entry(std::function<bool(libsinsp::state::table_entry&)> pred) override
	{
		plugin_table_entry entry(m_owner, m_input, m_dyn_fields, NULL, false);
		table_iterator_state state;
		state.m_it = &pred;
		state.m_entry = &entry;
		auto s = static_cast<ss_plugin_table_iterator_state_t*>(&state);
		if (m_input->reader_ext->iterate_entries(m_input->table, table_iterator_func, s) == 0)
		{
			// avoids invoking release_table_entry
			entry.m_entry = NULL;
			if (!state.err.empty())
			{
				throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "iterate entries failure: " + state.err);
			}
			return false;
		}
		// avoids invoking release_table_entry
		entry.m_entry = NULL;
		return true;
	}

	std::unique_ptr<libsinsp::state::table_entry> new_entry() const override
	{
		auto res = m_input->writer_ext->create_table_entry(m_input->table);
		if (res == NULL)
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "create entry failure: " + m_owner->get_last_error());
		}
		return std::unique_ptr<libsinsp::state::table_entry>(new plugin_table_entry(m_owner, m_input, m_dyn_fields, res, true));
	}

	std::shared_ptr<libsinsp::state::table_entry> get_entry(const KeyType& key) override
	{
		ss_plugin_state_data keydata;
		get_key_as_data(key, keydata);
		auto res = m_input->reader_ext->get_table_entry(m_input->table, &keydata);
		if (res == NULL)
		{
			// note: libsinsp::state::table expects nullptr to be returned
			// instead of an error exception
			return nullptr;
		}

		// note: this includes an allocation and can be quite costly in the
		// critical path, however it should be used only when doing a sinsp->plugin
		// access, which is expected to not be common. For plugin->plugin table
		// access, we optimize for invoking the plugin's table symbol right away
		return std::shared_ptr<libsinsp::state::table_entry>(new plugin_table_entry(m_owner, m_input, m_dyn_fields, res, false));
	}

	std::shared_ptr<libsinsp::state::table_entry> add_entry(const KeyType& key, std::unique_ptr<libsinsp::state::table_entry> e) override
	{
		if (!e)
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "add entry invoked with null entry");
		}

		// we have no formal way for checking for misuses in which the invoker
		// adds an entry that has not been created buy this table (with
		// the right sub-type). Dynamic cast would be too expensive at this
		// level, so we just enable it in debug mode.
		ASSERT(dynamic_cast<plugin_table_entry*>(e.get()) != nullptr);
		plugin_table_entry* entry = static_cast<plugin_table_entry*>(e.get());
		ASSERT(entry->m_entry != nullptr);

		ss_plugin_state_data keydata;
		get_key_as_data(key, keydata);
		auto res = m_input->writer_ext->add_table_entry(m_input->table, &keydata, entry->m_entry);
		if (res == NULL)
		{
			throw sinsp_exception(table_input_error_prefix(m_owner, m_input.get()) + "add entry failure: " + m_owner->get_last_error());
		}
		entry->m_entry = res;
		entry->m_detached = false;
		return std::shared_ptr<libsinsp::state::table_entry>(std::move(e));
	}

	bool erase_entry(const KeyType& key) override
	{
		ss_plugin_state_data keydata;
		get_key_as_data(key, keydata);
		auto res = m_input->writer_ext->erase_table_entry(m_input->table, &keydata);
		// note: in case of failure, libsinsp::state::table expects false
		// to be returned instead of an error exception
		return res == SS_PLUGIN_SUCCESS;
	}

	private:
	static void get_key_as_data(const KeyType& key, ss_plugin_state_data& out);
};

template<> void plugin_table_wrapper<int8_t>::get_key_as_data(const int8_t& key, ss_plugin_state_data& out)
{
	out.s8 = key;
}

template<> void plugin_table_wrapper<int16_t>::get_key_as_data(const int16_t& key, ss_plugin_state_data& out)
{
	out.s16 = key;
}

template<> void plugin_table_wrapper<int32_t>::get_key_as_data(const int32_t& key, ss_plugin_state_data& out)
{
	out.s32 = key;
}

template<> void plugin_table_wrapper<int64_t>::get_key_as_data(const int64_t& key, ss_plugin_state_data& out)
{
	out.s64 = key;
}

template<> void plugin_table_wrapper<uint8_t>::get_key_as_data(const uint8_t& key, ss_plugin_state_data& out)
{
	out.u8 = key;
}

template<> void plugin_table_wrapper<uint16_t>::get_key_as_data(const uint16_t& key, ss_plugin_state_data& out)
{
	out.u16 = key;
}

template<> void plugin_table_wrapper<uint32_t>::get_key_as_data(const uint32_t& key, ss_plugin_state_data& out)
{
	out.u32 = key;
}

template<> void plugin_table_wrapper<uint64_t>::get_key_as_data(const uint64_t& key, ss_plugin_state_data& out)
{
	out.u64 = key;
}

template<> void plugin_table_wrapper<std::string>::get_key_as_data(const std::string& key, ss_plugin_state_data& out)
{
	out.str = key.c_str();
}

template<> void plugin_table_wrapper<bool>::get_key_as_data(const bool& key, ss_plugin_state_data& out)
{
	out.b = key;
}

template<> void plugin_table_wrapper<libsinsp::state::base_table*>::get_key_as_data(libsinsp::state::base_table* const& key, ss_plugin_state_data& out)
{
	out.table = static_cast<ss_plugin_table_t*>(key);
}

//
// sinsp_field_accessor_wrapper implementation
//
sinsp_plugin::sinsp_field_accessor_wrapper::~sinsp_field_accessor_wrapper()
{
	if (!accessor)
	{
		return;
	}
	#define _X(_type, _dtype) \
	{ \
		if (dynamic) \
		{ \
			delete static_cast<libsinsp::state::dynamic_struct::field_accessor<_type>*>(accessor); \
		} \
		else \
		{ \
			delete static_cast<libsinsp::state::static_struct::field_accessor<_type>*>(accessor); \
		} \
		break; \
	}
	std::string tmp;
	__CATCH_ERR_MSG(tmp, {
		__PLUGIN_STATETYPE_SWITCH(data_type);
	});
	#undef _X
}

sinsp_plugin::sinsp_field_accessor_wrapper::sinsp_field_accessor_wrapper(sinsp_plugin::sinsp_field_accessor_wrapper&& s)
{
	this->accessor = s.accessor;
	this->dynamic = s.dynamic;
	this->data_type = s.data_type;
	this->subtable_key_type = s.subtable_key_type;
	s.accessor = nullptr;
}

sinsp_plugin::sinsp_field_accessor_wrapper& sinsp_plugin::sinsp_field_accessor_wrapper::operator=(sinsp_plugin::sinsp_field_accessor_wrapper&& s)
{
	this->accessor = s.accessor;
	this->dynamic = s.dynamic;
	this->data_type = s.data_type;
	this->subtable_key_type = s.subtable_key_type;
	s.accessor = nullptr;
	return *this;
}

//
// sinsp_table_wrapper implementation
//
template <typename T>
void sinsp_plugin::sinsp_table_wrapper::set(sinsp_plugin* p, libsinsp::state::table<T>* t)
{
	if (!t)
	{
		throw sinsp_exception("null table assigned to sinsp table wrapper");
	}
	if (!p)
	{
		throw sinsp_exception("null plugin assigned to sinsp table wrapper");
	}

	m_table = t;
	m_owner_plugin = p;
	m_key_type = typeinfo_to_state_type(t->key_info());
	m_field_list.clear();
	m_table_plugin_owner = nullptr;
	m_table_plugin_input = nullptr;

	// note: if the we're wrapping a plugin-implemented table under the hood,
	// we just use the plugin-provided vtables right away instead of
	// going through the C++ wrapper. This is both faster and safer, also
	// because the current C++ wrapper for plugin-defined tables is just
	// a non-functional stub used only for complying to the registry interfaces.
	auto pt = dynamic_cast<plugin_table_wrapper<T>*>(t);
	if (pt)
	{
		m_table_plugin_owner = pt->m_owner;
		m_table_plugin_input = pt->m_input.get();
	}
}

void sinsp_plugin::sinsp_table_wrapper::unset()
{
	m_owner_plugin = nullptr;
	m_key_type = ss_plugin_state_type::SS_PLUGIN_ST_INT8;
	m_table = nullptr;
	m_field_list.clear();
	m_table_plugin_owner = nullptr;
	m_table_plugin_input = nullptr;
}

bool sinsp_plugin::sinsp_table_wrapper::is_set() const
{
	return m_table_plugin_input != nullptr || m_table != nullptr;
}

const ss_plugin_table_fieldinfo* sinsp_plugin::sinsp_table_wrapper::list_fields(ss_plugin_table_t* _t, uint32_t* nfields)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->fields_ext->list_table_fields(pt, nfields);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		t->m_field_list.clear();
		for (auto& info : *t->m_table->static_fields())
		{
			ss_plugin_table_fieldinfo i;
			i.name = info.second.name().c_str();
			i.field_type = typeinfo_to_state_type(info.second.info());
			i.read_only = info.second.readonly();
			t->m_field_list.push_back(i);
		}
		for (auto& info : t->m_table->dynamic_fields()->fields())
		{
			ss_plugin_table_fieldinfo i;
			i.name = info.second.name().c_str();
			i.field_type = typeinfo_to_state_type(info.second.info());
			i.read_only = false;
			t->m_field_list.push_back(i);
		}
		*nfields = t->m_field_list.size();
		return t->m_field_list.data();
	});
	return NULL;
}

ss_plugin_table_field_t* sinsp_plugin::sinsp_table_wrapper::get_field(ss_plugin_table_t* _t, const char* name, ss_plugin_state_type data_type)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->fields_ext->get_table_field(pt, name, data_type);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	libsinsp::state::static_struct::field_infos::const_iterator fixed_it;
	std::unordered_map<std::string, libsinsp::state::dynamic_struct::field_info>::const_iterator dyn_it;
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		auto it = t->m_field_accessors.find(name);
		if (it != t->m_field_accessors.end())
		{
			return static_cast<ss_plugin_table_field_t*>(it->second);
		}

		fixed_it = t->m_table->static_fields()->find(name);
		dyn_it = t->m_table->dynamic_fields()->fields().find(name);
		if (fixed_it != t->m_table->static_fields()->end()
				&& dyn_it != t->m_table->dynamic_fields()->fields().end())
		{
			// todo(jasondellaluce): plugins are not aware of the difference
			// between static and dynamic fields. Do we want to enforce
			// this limitation in the sinsp tables implementation as well?
			throw sinsp_exception("field is defined as both static and dynamic: " + std::string(name));
		}
	});

	#define _X(_type, _dtype) \
	{ \
		auto acc = fixed_it->second.new_accessor<_type>(); \
		sinsp_plugin::sinsp_field_accessor_wrapper acc_wrap; \
		acc_wrap.dynamic = false; \
		acc_wrap.data_type = data_type; \
		acc_wrap.accessor = new libsinsp::state::static_struct::field_accessor<_type>(acc); \
		t->m_owner_plugin->m_accessed_table_fields.push_back(std::move(acc_wrap)); \
		t->m_field_accessors[name] = &t->m_owner_plugin->m_accessed_table_fields.back(); \
		return t->m_field_accessors[name]; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		if (fixed_it != t->m_table->static_fields()->end())
		{
			if (data_type != typeinfo_to_state_type(fixed_it->second.info()))
			{
				throw sinsp_exception("incompatible data types for static field: " + std::string(name));
			}	
			__PLUGIN_STATETYPE_SWITCH(data_type);
		}
	});
	#undef _X

	#define _X(_type, _dtype) \
	{ \
		auto acc = dyn_it->second.new_accessor<_type>(); \
		sinsp_plugin::sinsp_field_accessor_wrapper acc_wrap; \
		acc_wrap.dynamic = true; \
		acc_wrap.data_type = data_type; \
		acc_wrap.accessor = new libsinsp::state::dynamic_struct::field_accessor<_type>(acc); \
		t->m_owner_plugin->m_accessed_table_fields.push_back(std::move(acc_wrap)); \
		t->m_field_accessors[name] = &t->m_owner_plugin->m_accessed_table_fields.back(); \
		return t->m_field_accessors[name]; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		if (dyn_it != t->m_table->dynamic_fields()->fields().end())
		{
			if (data_type != typeinfo_to_state_type(dyn_it->second.info()))
			{
				throw sinsp_exception("incompatible data types for dynamic field: " + std::string(name));
			}
			__PLUGIN_STATETYPE_SWITCH(data_type);
		}
		throw sinsp_exception("undefined field '" + std::string(name) + "' in table '" + t->m_table->name() + "'");
	});
	#undef _X

	return NULL;
}

ss_plugin_table_field_t* sinsp_plugin::sinsp_table_wrapper::add_field(ss_plugin_table_t* _t, const char* name, ss_plugin_state_type data_type)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (data_type == ss_plugin_state_type::SS_PLUGIN_ST_TABLE)
	{
		t->m_owner_plugin->m_last_owner_err = "can't add dynamic field of type table: " + std::string(name);
		return NULL;
	}

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->fields_ext->add_table_field(pt, name, data_type);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	if (t->m_table->static_fields()->find(name) != t->m_table->static_fields()->end())
	{
		t->m_owner_plugin->m_last_owner_err = "can't add dynamic field already defined as static: " + std::string(name);
		return NULL;
	}
		
	#define _X(_type, _dtype) \
	{ \
		t->m_table->dynamic_fields()->add_field<_type>(name); \
		break; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(data_type);
		return get_field(_t, name, data_type);
	});
	#undef _X
	return NULL;
}

const char* sinsp_plugin::sinsp_table_wrapper::get_name(ss_plugin_table_t* _t)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		return t->m_table_plugin_input->name;
	}

	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		return t->m_table->name().c_str();
	});
	return NULL;
}

uint64_t sinsp_plugin::sinsp_table_wrapper::get_size(ss_plugin_table_t* _t)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->reader_ext->get_table_size(pt);
		if (ret == ((uint64_t) -1))
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		return t->m_table->entries_count();
	});
	return ((uint64_t) -1);
}

ss_plugin_table_entry_t* sinsp_plugin::sinsp_table_wrapper::get_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->reader_ext->get_table_entry(pt, key);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	// note: the C++ API returns a shared pointer, but in plugins we only
	// use raw pointers without increasing/decreasing/owning the refcount.
	// How can we do better than this?
	// todo(jasondellaluce): should we actually make plugins own some memory,
	// to guarantee that the shared_ptr returned is properly refcounted?
	#define _X(_type, _dtype) \
	{ \
		auto tt = static_cast<libsinsp::state::table<_type>*>(t->m_table); \
		_type kk; \
		convert_types(key->_dtype, kk); \
		auto ret = tt->get_entry(kk); \
		if (ret != nullptr) \
		{ \
			auto owned_ptr = t->m_owner_plugin->find_unset_accessed_table_entry(); \
			*owned_ptr = ret; \
			return static_cast<ss_plugin_table_entry_t*>(owned_ptr); \
		} \
		throw sinsp_exception("get_entry found no element at given key"); \
		return NULL; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X
	return NULL;
}


void sinsp_plugin::sinsp_table_wrapper::release_table_entry(ss_plugin_table_t* _t, ss_plugin_table_entry_t* _e)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		t->m_table_plugin_input->reader_ext->release_table_entry(pt, _e);
		return;
	}

	static_cast<std::shared_ptr<libsinsp::state::table_entry>*>(_e)->reset();
}

ss_plugin_bool sinsp_plugin::sinsp_table_wrapper::iterate_entries(ss_plugin_table_t* _t, ss_plugin_table_iterator_func_t it, ss_plugin_table_iterator_state_t* s)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		return t->m_table_plugin_input->reader_ext->iterate_entries(pt, it, s);
	}

	std::shared_ptr<libsinsp::state::table_entry> owned_ptr;
	std::function<bool(libsinsp::state::table_entry&)> iter = [&owned_ptr, &it, &s](auto& e)
	{
		owned_ptr.reset(&e, [](libsinsp::state::table_entry* p) { });
		return it(s, static_cast<ss_plugin_table_entry_t*>(&owned_ptr)) != 0;
	};

	#define _X(_type, _dtype) \
	{ \
		auto tt = static_cast<libsinsp::state::table<_type>*>(t->m_table); \
		return tt->foreach_entry(iter); \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X

	return false;
}
	
ss_plugin_rc sinsp_plugin::sinsp_table_wrapper::clear(ss_plugin_table_t* _t)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->writer_ext->clear_table(pt);
		if (ret == SS_PLUGIN_FAILURE)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		t->m_table->clear_entries();
		return SS_PLUGIN_SUCCESS;
	});
	return SS_PLUGIN_FAILURE;
}

ss_plugin_rc sinsp_plugin::sinsp_table_wrapper::erase_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->writer_ext->erase_table_entry(pt, key);
		if (ret == SS_PLUGIN_FAILURE)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	#define _X(_type, _dtype) \
	{ \
		_type kk; \
		convert_types(key->_dtype, kk); \
		if (static_cast<libsinsp::state::table<_type>*>(t->m_table)->erase_entry(kk)) \
		{ \
			return SS_PLUGIN_SUCCESS; \
		} \
		else \
		{ \
			t->m_owner_plugin->m_last_owner_err = "table entry not found"; \
			return SS_PLUGIN_FAILURE; \
		} \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X
	return SS_PLUGIN_FAILURE;
}

ss_plugin_table_entry_t* sinsp_plugin::sinsp_table_wrapper::create_table_entry(ss_plugin_table_t* _t)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->writer_ext->create_table_entry(pt);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	#define _X(_type, _dtype) \
	{ \
		auto tt = static_cast<libsinsp::state::table<_type>*>(t->m_table); \
		auto ret = tt->new_entry().release(); \
		auto owned_ptr = t->m_owner_plugin->find_unset_accessed_table_entry(); \
		owned_ptr->reset(ret, [](libsinsp::state::table_entry* p) { /* do nothing */ }); \
		return static_cast<ss_plugin_table_entry_t*>(owned_ptr); \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X
	return NULL;
}

void sinsp_plugin::sinsp_table_wrapper::destroy_table_entry(ss_plugin_table_t* _t, ss_plugin_table_entry_t* _e)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		t->m_table_plugin_input->writer_ext->destroy_table_entry(pt, _e);
		return;
	}

	#define _X(_type, _dtype) \
	{ \
		auto e = static_cast<std::shared_ptr<libsinsp::state::table_entry>*>(_e); \
		auto ptr = std::unique_ptr<libsinsp::state::table_entry>(e->get()); \
		e->reset(); \
		break; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X
}

ss_plugin_table_entry_t* sinsp_plugin::sinsp_table_wrapper::add_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key, ss_plugin_table_entry_t* _e)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->writer_ext->add_table_entry(pt, key, _e);
		if (ret == NULL)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	#define _X(_type, _dtype) \
	{ \
		auto e = static_cast<std::shared_ptr<libsinsp::state::table_entry>*>(_e); \
		auto ptr = std::unique_ptr<libsinsp::state::table_entry>(e->get()); \
		e->reset(); \
		auto tt = static_cast<libsinsp::state::table<_type>*>(t->m_table); \
		_type kk; \
		convert_types(key->_dtype, kk); \
		auto owned_ptr = t->m_owner_plugin->find_unset_accessed_table_entry(); \
		*owned_ptr = tt->add_entry(kk, std::move(ptr)); \
		return static_cast<ss_plugin_table_entry_t*>(owned_ptr); \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(t->m_key_type);
	});
	#undef _X
	return NULL;
}

ss_plugin_rc sinsp_plugin::sinsp_table_wrapper::read_entry_field(ss_plugin_table_t* _t, ss_plugin_table_entry_t* _e, const ss_plugin_table_field_t* f, ss_plugin_state_data* out)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->reader_ext->read_entry_field(pt, _e, f, out);
		if (ret == SS_PLUGIN_FAILURE)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	auto a = static_cast<const sinsp_plugin::sinsp_field_accessor_wrapper*>(f);
	auto e = static_cast<std::shared_ptr<libsinsp::state::table_entry>*>(_e);
	auto res = SS_PLUGIN_FAILURE;

	#define _X(_type, _dtype) \
	{ \
		if (a->dynamic) \
		{ \
			auto aa = static_cast<libsinsp::state::dynamic_struct::field_accessor<_type>*>(a->accessor); \
			e->get()->get_dynamic_field<_type>(*aa, out->_dtype); \
		} \
		else \
		{ \
			auto aa = static_cast<libsinsp::state::static_struct::field_accessor<_type>*>(a->accessor); \
			e->get()->get_static_field<_type>(*aa, out->_dtype); \
		} \
		res = SS_PLUGIN_SUCCESS; \
		break; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(a->data_type);
	});
	#undef _X

	#define _X(_type, _dtype) \
	{ \
		auto st = static_cast<libsinsp::state::table<_type>*>(subtable_ptr); \
		auto& slot = t->m_owner_plugin->find_unset_ephemeral_table(); \
		slot.wrapper.set<_type>(t->m_owner_plugin, st); \
		slot.update(); \
		out->table = &slot.input; \
	};
	if (a->data_type == ss_plugin_state_type::SS_PLUGIN_ST_TABLE)
	{
		auto* subtable_ptr = out->table;
		__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
			__PLUGIN_STATETYPE_SWITCH(a->subtable_key_type);
		});
	}
	#undef _X

	return res;
}

ss_plugin_rc sinsp_plugin::sinsp_table_wrapper::write_entry_field(ss_plugin_table_t* _t, ss_plugin_table_entry_t* _e, const ss_plugin_table_field_t* f, const ss_plugin_state_data* in)
{
	auto t = static_cast<sinsp_table_wrapper*>(_t);

	if (t->m_table_plugin_input)
	{
		auto pt = t->m_table_plugin_input->table;
		auto ret = t->m_table_plugin_input->writer_ext->write_entry_field(pt, _e, f, in);
		if (ret == SS_PLUGIN_FAILURE)
		{
			t->m_owner_plugin->m_last_owner_err = t->m_table_plugin_owner->get_last_error();
		}
		return ret;
	}

	auto a = static_cast<const sinsp_plugin::sinsp_field_accessor_wrapper*>(f);
	auto e = static_cast<std::shared_ptr<libsinsp::state::table_entry>*>(_e);

	// todo(jasondellaluce): drop this check once we start supporting this
	if (a->data_type == ss_plugin_state_type::SS_PLUGIN_ST_TABLE)
	{
		t->m_owner_plugin->m_last_owner_err = "writing to table fields is currently not supported";
		return SS_PLUGIN_FAILURE;
	}

	#define _X(_type, _dtype) \
	{ \
		if (a->dynamic) \
		{ \
			auto aa = static_cast<libsinsp::state::dynamic_struct::field_accessor<_type>*>(a->accessor); \
			_type val; \
			convert_types(in->_dtype, val); \
			e->get()->set_dynamic_field<_type>(*aa, val); \
		} \
		else \
		{ \
			auto aa = static_cast<libsinsp::state::static_struct::field_accessor<_type>*>(a->accessor); \
			_type val; \
			convert_types(in->_dtype, val); \
			e->get()->set_static_field<_type>(*aa, val); \
		} \
		return SS_PLUGIN_SUCCESS; \
	}
	__CATCH_ERR_MSG(t->m_owner_plugin->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(a->data_type);
	});
	#undef _X
	return SS_PLUGIN_FAILURE;
}

//
// sinsp_table_input implementation
//
sinsp_plugin::sinsp_table_input::sinsp_table_input()
{
	// populate vtables
	reader_vtable.get_table_name = sinsp_plugin::sinsp_table_wrapper::get_name;
	reader_vtable.get_table_size = sinsp_plugin::sinsp_table_wrapper::get_size;
	reader_vtable.get_table_entry = sinsp_plugin::sinsp_table_wrapper::get_entry;
	reader_vtable.read_entry_field = sinsp_plugin::sinsp_table_wrapper::read_entry_field;
	reader_vtable.release_table_entry = sinsp_plugin::sinsp_table_wrapper::release_table_entry;
	reader_vtable.iterate_entries = sinsp_plugin::sinsp_table_wrapper::iterate_entries;
	writer_vtable.clear_table = sinsp_plugin::sinsp_table_wrapper::clear;
	writer_vtable.erase_table_entry = sinsp_plugin::sinsp_table_wrapper::erase_entry;
	writer_vtable.create_table_entry = sinsp_plugin::sinsp_table_wrapper::create_table_entry;
	writer_vtable.destroy_table_entry = sinsp_plugin::sinsp_table_wrapper::destroy_table_entry;
	writer_vtable.add_table_entry = sinsp_plugin::sinsp_table_wrapper::add_entry;
	writer_vtable.write_entry_field = sinsp_plugin::sinsp_table_wrapper::write_entry_field;
	fields_vtable.list_table_fields = sinsp_plugin::sinsp_table_wrapper::list_fields;
	fields_vtable.add_table_field = sinsp_plugin::sinsp_table_wrapper::add_field;
	fields_vtable.get_table_field = sinsp_plugin::sinsp_table_wrapper::get_field;

	// fill-up input's legacy vtables for backward compatibility
	input.reader.get_table_name = reader_vtable.get_table_name;
	input.reader.get_table_size = reader_vtable.get_table_size;
	input.reader.get_table_entry = reader_vtable.get_table_entry;
	input.reader.read_entry_field = reader_vtable.read_entry_field;
	input.writer.clear_table = writer_vtable.clear_table;
	input.writer.erase_table_entry = writer_vtable.erase_table_entry;
	input.writer.create_table_entry = writer_vtable.create_table_entry;
	input.writer.destroy_table_entry = writer_vtable.destroy_table_entry;
	input.writer.add_table_entry = writer_vtable.add_table_entry;
	input.writer.write_entry_field = writer_vtable.write_entry_field;
	input.fields.list_table_fields = fields_vtable.list_table_fields;
	input.fields.add_table_field = fields_vtable.add_table_field;
	input.fields.get_table_field = fields_vtable.get_table_field;

	// bind input's vtables
	input.fields_ext = &fields_vtable;
	input.reader_ext = &reader_vtable;
	input.writer_ext = &writer_vtable;

	// fill-up with some default values
	input.table = nullptr;
	input.name = nullptr;
	input.key_type = wrapper.m_key_type;
}

void sinsp_plugin::sinsp_table_input::update()
{
	input.name = nullptr;
	input.table = nullptr;
	if (!wrapper.is_set())
	{
		return;
	}

	input.table = &wrapper;
	if (wrapper.m_table)
	{
		input.key_type = wrapper.m_key_type;
		input.name = wrapper.m_table->name().c_str();
	}
	else if (wrapper.m_table_plugin_input)
	{
		input.key_type = wrapper.m_table_plugin_input->key_type;
		input.name = wrapper.m_table_plugin_input->name;
	}
}


// the following table api symbols act as dispatcher for the table API
// interface, which is implemented through the type ss_plugin_table_input.
// For sinsp-defined tables, the ss_plugin_table_input is a wrapper around
// the libsinsp::state::table interface. For plugin-defined tables, the
// ss_plugin_table_input is provided by the table-owner plugin itself.
static const ss_plugin_table_fieldinfo* dispatch_list_fields(ss_plugin_table_t *_t, uint32_t *nfields)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->fields_ext->list_table_fields(t->table, nfields);
}

static ss_plugin_table_field_t* dispatch_get_field(ss_plugin_table_t* _t, const char* name, ss_plugin_state_type data_type)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->fields_ext->get_table_field(t->table, name, data_type);
}

static ss_plugin_table_field_t* dispatch_add_field(ss_plugin_table_t* _t, const char* name, ss_plugin_state_type data_type)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->fields_ext->add_table_field(t->table, name, data_type);
}

static const char* dispatch_get_name(ss_plugin_table_t* _t)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->reader_ext->get_table_name(t->table);
}

static uint64_t dispatch_get_size(ss_plugin_table_t* _t)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->reader_ext->get_table_size(t->table);
}

static ss_plugin_table_entry_t* dispatch_get_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->reader_ext->get_table_entry(t->table, key);
}

static ss_plugin_rc dispatch_read_entry_field(ss_plugin_table_t* _t, ss_plugin_table_entry_t* e, const ss_plugin_table_field_t* f, ss_plugin_state_data* out)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->reader_ext->read_entry_field(t->table, e, f, out);
}

static void dispatch_release_table_entry(ss_plugin_table_t* _t, ss_plugin_table_entry_t* e)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	t->reader_ext->release_table_entry(t->table, e);
}

static ss_plugin_bool dispatch_iterate_entries(ss_plugin_table_t* _t, ss_plugin_table_iterator_func_t it, ss_plugin_table_iterator_state_t* s)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->reader_ext->iterate_entries(t->table, it, s);
}

static ss_plugin_rc dispatch_clear(ss_plugin_table_t* _t)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->clear_table(t->table);
}

static ss_plugin_rc dispatch_erase_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->erase_table_entry(t->table, key);
}

static ss_plugin_table_entry_t* dispatch_create_table_entry(ss_plugin_table_t* _t)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->create_table_entry(t->table);
}

static void dispatch_destroy_table_entry(ss_plugin_table_t* _t, ss_plugin_table_entry_t* e)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->destroy_table_entry(t->table, e);
}

static ss_plugin_table_entry_t* dispatch_add_entry(ss_plugin_table_t* _t, const ss_plugin_state_data* key, ss_plugin_table_entry_t* entry)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->add_table_entry(t->table, key, entry);
}

static ss_plugin_rc dispatch_write_entry_field(ss_plugin_table_t* _t, ss_plugin_table_entry_t* e, const ss_plugin_table_field_t* f, const ss_plugin_state_data* in)
{
	auto t = static_cast<ss_plugin_table_input*>(_t);
	return t->writer_ext->write_entry_field(t->table, e, f, in);
}

//
// sinsp_plugin table helpers implementation
//
void sinsp_plugin::table_field_api(ss_plugin_table_fields_vtable& out, ss_plugin_table_fields_vtable_ext& extout)
{
	extout.list_table_fields = dispatch_list_fields;
	extout.add_table_field = dispatch_add_field;
	extout.get_table_field = dispatch_get_field;
	/* Deprecated */
	out.list_table_fields = extout.list_table_fields;
	out.add_table_field = extout.add_table_field;
	out.get_table_field = extout.get_table_field;
}

void sinsp_plugin::table_read_api(ss_plugin_table_reader_vtable& out, ss_plugin_table_reader_vtable_ext& extout)
{
	extout.get_table_name = dispatch_get_name;
	extout.get_table_size = dispatch_get_size;
	extout.get_table_entry = dispatch_get_entry;
	extout.read_entry_field = dispatch_read_entry_field;
	extout.release_table_entry = dispatch_release_table_entry;
	extout.iterate_entries = dispatch_iterate_entries;
	/* Deprecated */
	out.get_table_name = extout.get_table_name;
	out.get_table_size = extout.get_table_size;
	out.get_table_entry = extout.get_table_entry;
	out.read_entry_field = extout.read_entry_field;
}

void sinsp_plugin::table_write_api(ss_plugin_table_writer_vtable& out, ss_plugin_table_writer_vtable_ext& extout)
{
	extout.clear_table = dispatch_clear;
	extout.erase_table_entry = dispatch_erase_entry;
	extout.create_table_entry = dispatch_create_table_entry;
	extout.destroy_table_entry = dispatch_destroy_table_entry;
	extout.add_table_entry = dispatch_add_entry;
	extout.write_entry_field = dispatch_write_entry_field;
	out.clear_table = extout.clear_table;
	out.erase_table_entry = extout.erase_table_entry;
	out.create_table_entry = extout.create_table_entry;
	out.destroy_table_entry = extout.destroy_table_entry;
	out.add_table_entry = extout.add_table_entry;
	out.write_entry_field = extout.write_entry_field;
}

ss_plugin_table_info* sinsp_plugin::table_api_list_tables(ss_plugin_owner_t* o, uint32_t* ntables)
{
	auto p = static_cast<sinsp_plugin*>(o);
	__CATCH_ERR_MSG(p->m_last_owner_err, {
		*ntables = 0;
		p->m_table_infos.clear();
		for (const auto &d : p->m_table_registry->tables())
		{
			ss_plugin_table_info info;
			info.name = d.second->name().c_str();
			info.key_type = typeinfo_to_state_type(d.second->key_info());
			p->m_table_infos.push_back(info);
		}
		*ntables = p->m_table_infos.size();
		return p->m_table_infos.data();
	});
	return NULL;
}

ss_plugin_table_t* sinsp_plugin::table_api_get_table(ss_plugin_owner_t *o, const char *name, ss_plugin_state_type key_type)
{
	auto p = static_cast<sinsp_plugin*>(o);

	// if a plugin is accessing a plugin-owned table, we return it as-is
	// instead of wrapping it. This is both more performant and safer from
	// a memory ownership perspective, because the other plugin is the actual
	// total owner of the table's memory. Note, even though dynamic_cast is
	// generally quite expensive, the "get_table" primitive can only be
	// used during plugin initialization, so it's not in the hot path.
	#define _X(_type, _dtype) \
	{ \
		auto t = p->m_table_registry->get_table<_type>(name); \
		if (!t) \
		{ \
			return NULL; \
		} \
		p->m_accessed_tables[name].wrapper.set(p, t); \
		p->m_accessed_tables[name].update(); \
		return static_cast<ss_plugin_table_t*>(&p->m_accessed_tables[name].input); \
	};
	__CATCH_ERR_MSG(p->m_last_owner_err, {
		auto& tables = p->m_accessed_tables;
		auto it = tables.find(name);
		if (it == tables.end())
		{
			__PLUGIN_STATETYPE_SWITCH(key_type);
		}
		return static_cast<ss_plugin_table_t*>(&it->second.input);
	});
	#undef _X
	return NULL;
}

ss_plugin_rc sinsp_plugin::table_api_add_table(ss_plugin_owner_t *o, const ss_plugin_table_input* in)
{
	auto p = static_cast<sinsp_plugin*>(o);
	#define _X(_type, _dtype) \
	{ \
		auto t = new plugin_table_wrapper<_type>(p, in); \
		p->m_table_registry->add_table(t); \
		p->m_owned_tables[in->name] = std::unique_ptr<libsinsp::state::base_table>(t); \
		break; \
	}
	__CATCH_ERR_MSG(p->m_last_owner_err, {
		__PLUGIN_STATETYPE_SWITCH(in->key_type);
		return SS_PLUGIN_SUCCESS;
	});
	#undef _X
	return SS_PLUGIN_FAILURE;
}
