#ifndef MSP_NET_PROTOCOL_H_
#define MSP_NET_PROTOCOL_H_
+#include <cstdint>
#include <map>
#include <stdexcept>
#include <vector>
+#include <msp/core/hash.h>
#include "receiver.h"
namespace Msp {
{
public:
bad_packet(const std::string &w): std::runtime_error(w) { }
- virtual ~bad_packet() throw() { }
};
{
public:
buffer_error(const std::string &w): std::runtime_error(w) { }
- virtual ~buffer_error() throw() { }
};
class Protocol
{
private:
- class PacketDefBase
+ template<typename T, std::uint8_t K>
+ struct BasicTraits;
+
+ template<typename T>
+ struct Traits;
+
+ template<typename C>
+ class Serializer;
+
+ template<typename T>
+ class BasicSerializer
{
- protected:
- unsigned id;
+ public:
+ BasicSerializer(const Protocol &) { }
+
+ std::uint64_t get_hash() const { return Traits<T>::signature; }
+ char *serialize(const T &, char *, char *) const;
+ const char *deserialize(T &, const char *, const char *) const;
+ };
+
+ class StringSerializer
+ {
+ private:
+ BasicSerializer<std::uint16_t> length_serializer;
- PacketDefBase(unsigned i): id(i) { }
public:
- virtual ~PacketDefBase() { }
- virtual unsigned get_class_id() const = 0;
- unsigned get_id() const { return id; }
- virtual const char *disassemble(ReceiverBase &, const char *, const char *) const = 0;
+ StringSerializer(const Protocol &);
- static unsigned next_class_id;
+ std::uint64_t get_hash() const;
+ char *serialize(const std::string &, char *, char *) const;
+ const char *deserialize(std::string &, const char *, const char *) const;
};
- template<typename P>
- class FieldBase
+ template<typename A>
+ class ArraySerializer
{
- protected:
- FieldBase() { }
+ private:
+ BasicSerializer<std::uint16_t> length_serializer;
+ typename Traits<typename A::value_type>::Serializer element_serializer;
+
public:
- virtual ~FieldBase() { }
- virtual char *assemble(const P &, char *, char *) const = 0;
- virtual const char *disassemble(P &, const char *, const char *) const = 0;
+ ArraySerializer(const Protocol &);
+
+ std::uint64_t get_hash() const;
+ char *serialize(const A &, char *, char *) const;
+ const char *deserialize(A &, const char *, const char *) const;
};
- template<typename P, typename T>
- class Field: public FieldBase<P>
+ template<typename C>
+ class CompoundSerializer
{
private:
- T P::*ptr;
+ const Serializer<C> &serializer;
public:
- Field(T P::*p): ptr(p) { }
+ CompoundSerializer(const Protocol &);
+
+ std::uint64_t get_hash() const;
+ char *serialize(const C &, char *, char *) const;
+ const char *deserialize(C &, const char *, const char *) const;
+ };
- virtual char *assemble(const P &p, char *d, char *e) const
- { return assemble_field(p.*ptr, d, e); }
+ template<typename C, typename Head, typename T>
+ class FieldSerializer: public Head
+ {
+ public:
+ template<typename N>
+ using Next = FieldSerializer<C, FieldSerializer<C, Head, T>, N>;
+
+ private:
+ T C::*ptr;
+ typename Traits<T>::Serializer ser;
- virtual const char *disassemble(P &p, const char *d, const char *e) const
- { return disassemble_field(p.*ptr, d, e); }
+ public:
+ FieldSerializer(const Head &, T C::*, const Protocol &);
+
+ std::uint64_t get_hash() const;
+ char *serialize(const C &, char *, char *) const;
+ const char *deserialize(C &, const char *, const char *) const;
+ };
+
+ template<typename C>
+ class Serializer
+ {
+ public:
+ template<typename N>
+ using Next = FieldSerializer<C, Serializer<C>, N>;
+
+ virtual ~Serializer() = default;
+
+ virtual std::uint64_t get_hash() const { return 0; }
+ virtual char *serialize(const C &, char *b, char *) const { return b; }
+ virtual const char *deserialize(C &, const char *b, const char *) const { return b; }
+ };
+
+ class PacketDefBase
+ {
+ protected:
+ unsigned id;
+
+ PacketDefBase(unsigned);
+ public:
+ virtual ~PacketDefBase() = default;
+
+ virtual unsigned get_class_id() const = 0;
+ unsigned get_id() const { return id; }
+ virtual std::uint64_t get_hash() const = 0;
+ virtual const char *dispatch(ReceiverBase &, const char *, const char *) const = 0;
};
-protected:
template<typename P>
- class PacketDef: public PacketDefBase
+ class PacketTypeDef: public PacketDefBase
{
private:
- std::vector<FieldBase<P> *> fields;
+ Serializer<P> *serializer;
public:
- PacketDef(unsigned i): PacketDefBase(i)
- { if(!class_id) class_id = next_class_id++; }
+ PacketTypeDef(unsigned);
+ ~PacketTypeDef();
+
+ unsigned get_class_id() const override { return get_packet_class_id<P>(); }
+
+ template<typename S>
+ void set_serializer(const S &);
+
+ const Serializer<P> &get_serializer() const { return *serializer; }
+
+ std::uint64_t get_hash() const override { return serializer->get_hash(); }
+ char *serialize(const P &, char *, char *) const;
+ const char *deserialize(P &, const char *, const char *) const;
+ const char *dispatch(ReceiverBase &, const char *, const char *) const override;
+ };
- ~PacketDef()
- {
- for(typename std::vector<FieldBase<P> *>::const_iterator i=fields.begin(); i!=fields.end(); ++i)
- delete *i;
- }
+ template<typename P, typename S>
+ class PacketDefBuilder
+ {
+ private:
+ const Protocol &protocol;
+ PacketTypeDef<P> &pktdef;
+ S serializer;
- virtual unsigned get_class_id() const { return class_id; }
+ public:
+ PacketDefBuilder(const Protocol &, PacketTypeDef<P> &, const S &);
template<typename T>
- PacketDef &operator()(T P::*p)
- { fields.push_back(new Field<P, T>(p)); return *this; }
-
- char *assemble(const P &p, char *d, char *e) const
- {
- for(typename std::vector<FieldBase<P> *>::const_iterator i=fields.begin(); i!=fields.end(); ++i)
- d = (*i)->assemble(p, d, e);
- return d;
- }
-
- const char *disassemble(ReceiverBase &r, const char *d, const char *e) const
- {
- PacketReceiver<P> *prcv = dynamic_cast<PacketReceiver<P> *>(&r);
- if(!prcv)
- throw bad_packet("unsupported");
- P pkt;
- for(typename std::vector<FieldBase<P> *>::const_iterator i=fields.begin(); i!=fields.end(); ++i)
- d = (*i)->disassemble(pkt, d, e);
- prcv->receive(pkt);
- return d;
- }
-
- static unsigned class_id;
+ PacketDefBuilder<P, typename S::template Next<T>> fields(T P::*);
+
+ template<typename T1, typename T2, typename... Rest>
+ auto fields(T1 P::*first, T2 P::*second, Rest P::*...rest) { return fields(first).fields(second, rest...); }
+ };
+
+ struct PacketHeader
+ {
+ std::uint16_t type = 0;
+ std::uint16_t length = 0;
+
+ PacketHeader() = default;
+ PacketHeader(std::uint16_t, std::uint16_t);
};
typedef std::map<unsigned, PacketDefBase *> PacketMap;
+ PacketTypeDef<PacketHeader> header_def;
unsigned next_packet_id;
PacketMap packet_class_defs;
PacketMap packet_id_defs;
+protected:
Protocol(unsigned = 1);
public:
~Protocol();
private:
- void add_packet(PacketDefBase &);
+ static unsigned get_next_packet_class_id();
+
+ template<typename P>
+ static unsigned get_packet_class_id();
+
+ void add_packet(PacketDefBase *);
protected:
template<typename P>
- PacketDef<P> &add()
- {
- PacketDef<P> *pdef = new PacketDef<P>(next_packet_id++);
- add_packet(*pdef);
- return *pdef;
- }
+ PacketDefBuilder<P, Serializer<P>> add(unsigned);
+
+ template<typename P, typename T, typename... Rest>
+ auto add(unsigned id, T P::*field, Rest P::*...rest) { return add<P>(id).fields(field, rest...); }
+
+ template<typename P>
+ PacketDefBuilder<P, Serializer<P>> add();
+
+ template<typename P, typename T, typename... Rest>
+ auto add(T P::*field, Rest P::*...rest) { return add<P>().fields(field, rest...); }
- const PacketDefBase &get_packet_by_class(unsigned) const;
+ const PacketDefBase &get_packet_by_class_id(unsigned) const;
const PacketDefBase &get_packet_by_id(unsigned) const;
+ template<typename P>
+ const PacketTypeDef<P> &get_packet_by_class() const;
+
public:
template<typename P>
- unsigned assemble(const P &pkt, char *buf, unsigned size) const
- {
- unsigned id = PacketDef<P>::class_id;
- const PacketDef<P> &pdef = static_cast<const PacketDef<P> &>(get_packet_by_class(id));
- char *ptr = pdef.assemble(pkt, buf+4, buf+size);
- assemble_header(buf, pdef.get_id(), (size = ptr-buf));
- return size;
- }
+ std::size_t serialize(const P &, char *, std::size_t) const;
- unsigned disassemble(ReceiverBase &, const char *, unsigned) const;
+ std::size_t get_packet_size(const char *, std::size_t) const;
+ std::size_t dispatch(ReceiverBase &, const char *, std::size_t) const;
- unsigned get_packet_size(const char *, unsigned) const;
+ std::uint64_t get_hash() const;
+};
- unsigned get_hash() const;
-private:
- static void assemble_header(char *, unsigned, unsigned);
+template<typename P>
+unsigned Protocol::get_packet_class_id()
+{
+ static unsigned id = get_next_packet_class_id();
+ return id;
+}
- template<typename T>
- static char *assemble_field(const T &, char *, char *);
+template<typename P>
+Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add(unsigned id)
+{
+ PacketTypeDef<P> *pdef = new PacketTypeDef<P>(id);
+ add_packet(pdef);
+ return PacketDefBuilder<P, Serializer<P>>(*this, *pdef, Serializer<P>());
+}
- template<typename T>
- static const char *disassemble_field(T &, const char *, const char *);
+template<typename P>
+Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add()
+{
+ return add<P>(next_packet_id++);
+}
+
+template<typename P>
+const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
+{
+ const PacketDefBase &pdef = get_packet_by_class_id(get_packet_class_id<P>());
+ return static_cast<const PacketTypeDef<P> &>(pdef);
+}
+
+template<typename P>
+std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size) const
+{
+ const PacketTypeDef<P> &pdef = get_packet_by_class<P>();
+ if(!pdef.get_id())
+ throw std::invalid_argument("no packet id");
+ char *ptr = pdef.serialize(pkt, buf+4, buf+size);
+ size = ptr-buf;
+ header_def.serialize(PacketHeader(pdef.get_id(), size), buf, buf+4);
+ return size;
+}
+
+
+template<typename T, std::uint8_t K>
+struct Protocol::BasicTraits
+{
+ static const std::uint16_t signature = K | (sizeof(T)<<8);
+ typedef BasicSerializer<T> Serializer;
+};
+
+template<typename T>
+struct Protocol::Traits
+{
+ static const std::uint16_t signature = 'C';
+ typedef CompoundSerializer<T> Serializer;
};
+template<> struct Protocol::Traits<bool>: BasicTraits<bool, 'B'> { };
+template<> struct Protocol::Traits<std::int8_t>: BasicTraits<std::int8_t, 'I'> { };
+template<> struct Protocol::Traits<std::uint8_t>: BasicTraits<std::uint8_t, 'U'> { };
+template<> struct Protocol::Traits<std::int16_t>: BasicTraits<std::int16_t, 'I'> { };
+template<> struct Protocol::Traits<std::uint16_t>: BasicTraits<std::uint16_t, 'U'> { };
+template<> struct Protocol::Traits<std::int32_t>: BasicTraits<std::int32_t, 'I'> { };
+template<> struct Protocol::Traits<std::uint32_t>: BasicTraits<std::uint32_t, 'U'> { };
+template<> struct Protocol::Traits<std::int64_t>: BasicTraits<std::int64_t, 'I'> { };
+template<> struct Protocol::Traits<std::uint64_t>: BasicTraits<std::uint64_t, 'U'> { };
+template<> struct Protocol::Traits<float>: BasicTraits<float, 'F'> { };
+template<> struct Protocol::Traits<double>: BasicTraits<double, 'F'> { };
+
+template<> struct Protocol::Traits<std::string>
+{
+ static const std::uint16_t signature = 'S';
+ typedef StringSerializer Serializer;
+};
+
+template<typename T>
+struct Protocol::Traits<std::vector<T>>
+{
+ static const std::uint16_t signature = 'A';
+ typedef ArraySerializer<std::vector<T>> Serializer;
+};
+
+
+inline std::uint64_t Protocol::StringSerializer::get_hash() const
+{
+ return Traits<std::string>::signature;
+}
+
+
+template<typename A>
+Protocol::ArraySerializer<A>::ArraySerializer(const Protocol &proto):
+ length_serializer(proto),
+ element_serializer(proto)
+{ }
+
+template<typename A>
+std::uint64_t Protocol::ArraySerializer<A>::get_hash() const
+{
+ return hash_round<64>(element_serializer.get_hash(), 'A');
+}
+
+template<typename A>
+char *Protocol::ArraySerializer<A>::serialize(const A &array, char *buf, char *end) const
+{
+ buf = length_serializer.serialize(array.size(), buf, end);
+ for(const auto &e: array)
+ buf = element_serializer.serialize(e, buf, end);
+ return buf;
+}
+
+template<typename A>
+const char *Protocol::ArraySerializer<A>::deserialize(A &array, const char *buf, const char *end) const
+{
+ std::uint16_t length;
+ buf = length_serializer.deserialize(length, buf, end);
+ array.resize(length);
+ for(unsigned i=0; i<length; ++i)
+ buf = element_serializer.deserialize(array[i], buf, end);
+ return buf;
+}
+
+
+template<typename C>
+Protocol::CompoundSerializer<C>::CompoundSerializer(const Protocol &proto):
+ serializer(proto.get_packet_by_class<C>().get_serializer())
+{ }
+
+template<typename C>
+std::uint64_t Protocol::CompoundSerializer<C>::get_hash() const
+{
+ return hash_round<64>(serializer.get_hash(), 'C');
+}
+
+template<typename C>
+char *Protocol::CompoundSerializer<C>::serialize(const C &com, char *buf, char *end) const
+{
+ return serializer.serialize(com, buf, end);
+}
+
+template<typename C>
+const char *Protocol::CompoundSerializer<C>::deserialize(C &com, const char *buf, const char *end) const
+{
+ return serializer.deserialize(com, buf, end);
+}
+
+
+template<typename C, typename Head, typename T>
+Protocol::FieldSerializer<C, Head, T>::FieldSerializer(const Head &h, T C::*p, const Protocol &proto):
+ Head(h),
+ ptr(p),
+ ser(proto)
+{ }
+
+template<typename C, typename Head, typename T>
+std::uint64_t Protocol::FieldSerializer<C, Head, T>::get_hash() const
+{
+ return hash_update<64>(Head::get_hash(), ser.get_hash());
+}
+
+template<typename C, typename Head, typename T>
+char *Protocol::FieldSerializer<C, Head, T>::serialize(const C &com, char *buf, char *end) const
+{
+ buf = Head::serialize(com, buf, end);
+ return ser.serialize(com.*ptr, buf, end);
+}
+
+template<typename C, typename Head, typename T>
+const char *Protocol::FieldSerializer<C, Head, T>::deserialize(C &com, const char *buf, const char *end) const
+{
+ buf = Head::deserialize(com, buf, end);
+ return ser.deserialize(com.*ptr, buf, end);
+}
+
+
+template<typename P>
+Protocol::PacketTypeDef<P>::PacketTypeDef(unsigned i):
+ PacketDefBase(i),
+ serializer(new Serializer<P>)
+{ }
+
+template<typename P>
+Protocol::PacketTypeDef<P>::~PacketTypeDef()
+{
+ delete serializer;
+}
+
+template<typename P>
+template<typename S>
+void Protocol::PacketTypeDef<P>::set_serializer(const S &ser)
+{
+ delete serializer;
+ serializer = new S(ser);
+}
+
template<typename P>
-unsigned Protocol::PacketDef<P>::class_id = 0;
+char *Protocol::PacketTypeDef<P>::serialize(const P &pkt, char *buf, char *end) const
+{
+ return serializer->serialize(pkt, buf, end);
+}
+
+template<typename P>
+const char *Protocol::PacketTypeDef<P>::deserialize(P &pkt, const char *buf, const char *end) const
+{
+ return serializer->deserialize(pkt, buf, end);
+}
+
+template<typename P>
+const char *Protocol::PacketTypeDef<P>::dispatch(ReceiverBase &rcv, const char *buf, const char *end) const
+{
+ PacketReceiver<P> *prcv = dynamic_cast<PacketReceiver<P> *>(&rcv);
+ if(!prcv)
+ throw bad_packet("unsupported");
+ P pkt;
+ buf = deserialize(pkt, buf, end);
+ prcv->receive(pkt);
+ return buf;
+}
+
+
+template<typename P, typename S>
+Protocol::PacketDefBuilder<P, S>::PacketDefBuilder(const Protocol &p, PacketTypeDef<P> &k, const S &s):
+ protocol(p),
+ pktdef(k),
+ serializer(s)
+{ }
+
+template<typename P, typename S>
+template<typename T>
+Protocol::PacketDefBuilder<P, typename S::template Next<T>> Protocol::PacketDefBuilder<P, S>::fields(T P::*ptr)
+{
+ typename S::template Next<T> next_ser(serializer, ptr, protocol);
+ pktdef.set_serializer(next_ser);
+ return PacketDefBuilder<P, typename S::template Next<T>>(protocol, pktdef, next_ser);
+}
} // namespace Net
} // namespace Msp