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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
enum SerializeFormat
{
/** Shown to a human (does not need to be unserializable) */
FORMAT_USER,
/** Passed internally to this process (i.e. for /RELOADMODULE) */
FORMAT_INTERNAL,
/** Passed to other servers on the network (i.e. METADATA s2s command) */
FORMAT_NETWORK,
/** Stored on disk (i.e. permchannel database) */
FORMAT_PERSIST
};
/** Class represnting an extension of some object
*/
class CoreExport ExtensionItem : public ServiceProvider, public usecountbase
{
public:
/** Extensible subclasses
*/
enum ExtensibleType
{
EXT_USER,
EXT_CHANNEL,
EXT_MEMBERSHIP
};
/** Type (subclass) of Extensible that this ExtensionItem is valid for
*/
const ExtensibleType type;
ExtensionItem(const std::string& key, ExtensibleType exttype, Module* owner);
virtual ~ExtensionItem();
/** Serialize this item into a string
*
* @param format The format to serialize to
* @param container The object containing this item
* @param item The item itself
*/
virtual std::string serialize(SerializeFormat format, const Extensible* container, void* item) const = 0;
/** Convert the string form back into an item
* @param format The format to serialize from (not FORMAT_USER)
* @param container The object that this item applies to
* @param value The return from a serialize() call that was run elsewhere with this key
*/
virtual void unserialize(SerializeFormat format, Extensible* container, const std::string& value) = 0;
/** Free the item */
virtual void free(void* item) = 0;
protected:
/** Get the item from the internal map */
void* get_raw(const Extensible* container) const;
/** Set the item in the internal map; returns old value */
void* set_raw(Extensible* container, void* value);
/** Remove the item from the internal map; returns old value */
void* unset_raw(Extensible* container);
};
/** class Extensible is the parent class of many classes such as User and Channel.
* class Extensible implements a system which allows modules to 'extend' the class by attaching data within
* a map associated with the object. In this way modules can store their own custom information within user
* objects, channel objects and server objects, without breaking other modules (this is more sensible than using
* a flags variable, and each module defining bits within the flag as 'theirs' as it is less prone to conflict and
* supports arbitary data storage).
*/
class CoreExport Extensible : public classbase
{
public:
typedef insp::flat_map<reference<ExtensionItem>, void*> ExtensibleStore;
// Friend access for the protected getter/setter
friend class ExtensionItem;
private:
/** Private data store.
* Holds all extensible metadata for the class.
*/
ExtensibleStore extensions;
/** True if this Extensible has been culled.
* A warning is generated if false on destruction.
*/
unsigned int culled:1;
public:
/**
* Get the extension items for iteraton (i.e. for metadata sync during netburst)
*/
inline const ExtensibleStore& GetExtList() const { return extensions; }
Extensible();
virtual CullResult cull();
virtual ~Extensible();
void doUnhookExtensions(const std::vector<reference<ExtensionItem> >& toRemove);
/**
* Free all extension items attached to this Extensible
*/
void FreeAllExtItems();
};
class CoreExport ExtensionManager
{
public:
typedef std::map<std::string, reference<ExtensionItem> > ExtMap;
bool Register(ExtensionItem* item);
void BeginUnregister(Module* module, std::vector<reference<ExtensionItem> >& list);
ExtensionItem* GetItem(const std::string& name);
/** Get all registered extensions keyed by their names
* @return Const map of ExtensionItem pointers keyed by their names
*/
const ExtMap& GetExts() const { return types; }
private:
ExtMap types;
};
/** Base class for items that are NOT synchronized between servers */
class CoreExport LocalExtItem : public ExtensionItem
{
public:
LocalExtItem(const std::string& key, ExtensibleType exttype, Module* owner);
virtual ~LocalExtItem();
virtual std::string serialize(SerializeFormat format, const Extensible* container, void* item) const;
virtual void unserialize(SerializeFormat format, Extensible* container, const std::string& value);
virtual void free(void* item) = 0;
};
template <typename T, typename Del = stdalgo::defaultdeleter<T> >
class SimpleExtItem : public LocalExtItem
{
public:
SimpleExtItem(const std::string& Key, ExtensibleType exttype, Module* parent)
: LocalExtItem(Key, exttype, parent)
{
}
virtual ~SimpleExtItem()
{
}
inline T* get(const Extensible* container) const
{
return static_cast<T*>(get_raw(container));
}
inline void set(Extensible* container, const T& value)
{
T* ptr = new T(value);
T* old = static_cast<T*>(set_raw(container, ptr));
Del del;
del(old);
}
inline void set(Extensible* container, T* value)
{
T* old = static_cast<T*>(set_raw(container, value));
Del del;
del(old);
}
inline void unset(Extensible* container)
{
T* old = static_cast<T*>(unset_raw(container));
Del del;
del(old);
}
virtual void free(void* item)
{
Del del;
del(static_cast<T*>(item));
}
};
class CoreExport LocalStringExt : public SimpleExtItem<std::string>
{
public:
LocalStringExt(const std::string& key, ExtensibleType exttype, Module* owner);
virtual ~LocalStringExt();
std::string serialize(SerializeFormat format, const Extensible* container, void* item) const;
};
class CoreExport LocalIntExt : public LocalExtItem
{
public:
LocalIntExt(const std::string& key, ExtensibleType exttype, Module* owner);
virtual ~LocalIntExt();
std::string serialize(SerializeFormat format, const Extensible* container, void* item) const;
intptr_t get(const Extensible* container) const;
intptr_t set(Extensible* container, intptr_t value);
void unset(Extensible* container) { set(container, 0); }
void free(void* item);
};
class CoreExport StringExtItem : public ExtensionItem
{
public:
StringExtItem(const std::string& key, ExtensibleType exttype, Module* owner);
virtual ~StringExtItem();
std::string* get(const Extensible* container) const;
std::string serialize(SerializeFormat format, const Extensible* container, void* item) const;
void unserialize(SerializeFormat format, Extensible* container, const std::string& value);
void set(Extensible* container, const std::string& value);
void unset(Extensible* container);
void free(void* item);
};
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