1 #ifndef MSP_NET_PROTOCOL_H_
2 #define MSP_NET_PROTOCOL_H_
9 #include <msp/core/hash.h>
15 class bad_packet: public std::runtime_error
18 bad_packet(const std::string &w): std::runtime_error(w) { }
22 class buffer_error: public std::runtime_error
25 buffer_error(const std::string &w): std::runtime_error(w) { }
32 template<typename T, std::uint8_t K>
45 BasicSerializer(const Protocol &) { }
47 std::uint64_t get_hash() const { return Traits<T>::signature; }
48 char *serialize(const T &, char *, char *) const;
49 const char *deserialize(T &, const char *, const char *) const;
52 class StringSerializer
55 BasicSerializer<std::uint16_t> length_serializer;
58 StringSerializer(const Protocol &);
60 std::uint64_t get_hash() const;
61 char *serialize(const std::string &, char *, char *) const;
62 const char *deserialize(std::string &, const char *, const char *) const;
69 BasicSerializer<std::uint16_t> length_serializer;
70 typename Traits<typename A::value_type>::Serializer element_serializer;
73 ArraySerializer(const Protocol &);
75 std::uint64_t get_hash() const;
76 char *serialize(const A &, char *, char *) const;
77 const char *deserialize(A &, const char *, const char *) const;
81 class CompoundSerializer
84 const Serializer<C> &serializer;
87 CompoundSerializer(const Protocol &);
89 std::uint64_t get_hash() const;
90 char *serialize(const C &, char *, char *) const;
91 const char *deserialize(C &, const char *, const char *) const;
94 template<typename C, typename Head, typename T>
95 class FieldSerializer: public Head
99 using Next = FieldSerializer<C, FieldSerializer<C, Head, T>, N>;
103 typename Traits<T>::Serializer ser;
106 FieldSerializer(const Head &, T C::*, const Protocol &);
108 std::uint64_t get_hash() const;
109 char *serialize(const C &, char *, char *) const;
110 const char *deserialize(C &, const char *, const char *) const;
118 using Next = FieldSerializer<C, Serializer<C>, N>;
120 virtual ~Serializer() = default;
122 virtual std::uint64_t get_hash() const { return 0; }
123 virtual char *serialize(const C &, char *b, char *) const { return b; }
124 virtual const char *deserialize(C &, const char *b, const char *) const { return b; }
132 PacketDefBase(unsigned);
134 virtual ~PacketDefBase() = default;
136 virtual unsigned get_class_id() const = 0;
137 unsigned get_id() const { return id; }
138 virtual std::uint64_t get_hash() const = 0;
139 virtual const char *dispatch(ReceiverBase &, const char *, const char *) const = 0;
143 class PacketTypeDef: public PacketDefBase
146 std::unique_ptr<Serializer<P>> serializer;
149 PacketTypeDef(unsigned);
151 unsigned get_class_id() const override { return get_packet_class_id<P>(); }
154 void set_serializer(const S &);
156 const Serializer<P> &get_serializer() const { return *serializer; }
158 std::uint64_t get_hash() const override { return serializer->get_hash(); }
159 char *serialize(const P &, char *, char *) const;
160 const char *deserialize(P &, const char *, const char *) const;
161 const char *dispatch(ReceiverBase &, const char *, const char *) const override;
164 template<typename P, typename S>
165 class PacketDefBuilder
168 const Protocol &protocol;
169 PacketTypeDef<P> &pktdef;
173 PacketDefBuilder(const Protocol &, PacketTypeDef<P> &, const S &);
176 PacketDefBuilder<P, typename S::template Next<T>> fields(T P::*);
178 template<typename T1, typename T2, typename... Rest>
179 auto fields(T1 P::*first, T2 P::*second, Rest P::*...rest) { return fields(first).fields(second, rest...); }
184 std::uint16_t type = 0;
185 std::uint16_t length = 0;
187 PacketHeader() = default;
188 PacketHeader(std::uint16_t, std::uint16_t);
191 PacketTypeDef<PacketHeader> header_def;
192 unsigned next_packet_id;
193 std::map<unsigned, std::unique_ptr<PacketDefBase>> packet_class_defs;
194 std::map<unsigned, PacketDefBase *> packet_id_defs;
197 Protocol(unsigned = 1);
200 static unsigned get_next_packet_class_id();
203 static unsigned get_packet_class_id();
205 void add_packet(std::unique_ptr<PacketDefBase>);
209 PacketDefBuilder<P, Serializer<P>> add(unsigned);
211 template<typename P, typename T, typename... Rest>
212 auto add(unsigned id, T P::*field, Rest P::*...rest) { return add<P>(id).fields(field, rest...); }
215 PacketDefBuilder<P, Serializer<P>> add();
217 template<typename P, typename T, typename... Rest>
218 auto add(T P::*field, Rest P::*...rest) { return add<P>().fields(field, rest...); }
220 const PacketDefBase &get_packet_by_class_id(unsigned) const;
221 const PacketDefBase &get_packet_by_id(unsigned) const;
224 const PacketTypeDef<P> &get_packet_by_class() const;
228 std::size_t serialize(const P &, char *, std::size_t) const;
230 std::size_t get_packet_size(const char *, std::size_t) const;
231 std::size_t dispatch(ReceiverBase &, const char *, std::size_t) const;
233 std::uint64_t get_hash() const;
238 unsigned Protocol::get_packet_class_id()
240 static unsigned id = get_next_packet_class_id();
245 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add(unsigned id)
247 std::unique_ptr<PacketTypeDef<P>> pdef = std::make_unique<PacketTypeDef<P>>(id);
248 PacketDefBuilder<P, Serializer<P>> next(*this, *pdef, Serializer<P>());
249 add_packet(move(pdef));
254 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add()
256 return add<P>(next_packet_id++);
260 const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
262 const PacketDefBase &pdef = get_packet_by_class_id(get_packet_class_id<P>());
263 return static_cast<const PacketTypeDef<P> &>(pdef);
267 std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size) const
269 const PacketTypeDef<P> &pdef = get_packet_by_class<P>();
271 throw std::invalid_argument("no packet id");
272 char *ptr = pdef.serialize(pkt, buf+4, buf+size);
274 header_def.serialize(PacketHeader(pdef.get_id(), size), buf, buf+4);
279 template<typename T, std::uint8_t K>
280 struct Protocol::BasicTraits
282 static const std::uint16_t signature = K | (sizeof(T)<<8);
283 typedef BasicSerializer<T> Serializer;
287 struct Protocol::Traits
289 static const std::uint16_t signature = 'C';
290 typedef CompoundSerializer<T> Serializer;
293 template<> struct Protocol::Traits<bool>: BasicTraits<bool, 'B'> { };
294 template<> struct Protocol::Traits<std::int8_t>: BasicTraits<std::int8_t, 'I'> { };
295 template<> struct Protocol::Traits<std::uint8_t>: BasicTraits<std::uint8_t, 'U'> { };
296 template<> struct Protocol::Traits<std::int16_t>: BasicTraits<std::int16_t, 'I'> { };
297 template<> struct Protocol::Traits<std::uint16_t>: BasicTraits<std::uint16_t, 'U'> { };
298 template<> struct Protocol::Traits<std::int32_t>: BasicTraits<std::int32_t, 'I'> { };
299 template<> struct Protocol::Traits<std::uint32_t>: BasicTraits<std::uint32_t, 'U'> { };
300 template<> struct Protocol::Traits<std::int64_t>: BasicTraits<std::int64_t, 'I'> { };
301 template<> struct Protocol::Traits<std::uint64_t>: BasicTraits<std::uint64_t, 'U'> { };
302 template<> struct Protocol::Traits<float>: BasicTraits<float, 'F'> { };
303 template<> struct Protocol::Traits<double>: BasicTraits<double, 'F'> { };
305 template<> struct Protocol::Traits<std::string>
307 static const std::uint16_t signature = 'S';
308 typedef StringSerializer Serializer;
312 struct Protocol::Traits<std::vector<T>>
314 static const std::uint16_t signature = 'A';
315 typedef ArraySerializer<std::vector<T>> Serializer;
319 inline std::uint64_t Protocol::StringSerializer::get_hash() const
321 return Traits<std::string>::signature;
326 Protocol::ArraySerializer<A>::ArraySerializer(const Protocol &proto):
327 length_serializer(proto),
328 element_serializer(proto)
332 std::uint64_t Protocol::ArraySerializer<A>::get_hash() const
334 return hash_round<64>(element_serializer.get_hash(), 'A');
338 char *Protocol::ArraySerializer<A>::serialize(const A &array, char *buf, char *end) const
340 buf = length_serializer.serialize(array.size(), buf, end);
341 for(const auto &e: array)
342 buf = element_serializer.serialize(e, buf, end);
347 const char *Protocol::ArraySerializer<A>::deserialize(A &array, const char *buf, const char *end) const
349 std::uint16_t length;
350 buf = length_serializer.deserialize(length, buf, end);
351 array.resize(length);
352 for(unsigned i=0; i<length; ++i)
353 buf = element_serializer.deserialize(array[i], buf, end);
359 Protocol::CompoundSerializer<C>::CompoundSerializer(const Protocol &proto):
360 serializer(proto.get_packet_by_class<C>().get_serializer())
364 std::uint64_t Protocol::CompoundSerializer<C>::get_hash() const
366 return hash_round<64>(serializer.get_hash(), 'C');
370 char *Protocol::CompoundSerializer<C>::serialize(const C &com, char *buf, char *end) const
372 return serializer.serialize(com, buf, end);
376 const char *Protocol::CompoundSerializer<C>::deserialize(C &com, const char *buf, const char *end) const
378 return serializer.deserialize(com, buf, end);
382 template<typename C, typename Head, typename T>
383 Protocol::FieldSerializer<C, Head, T>::FieldSerializer(const Head &h, T C::*p, const Protocol &proto):
389 template<typename C, typename Head, typename T>
390 std::uint64_t Protocol::FieldSerializer<C, Head, T>::get_hash() const
392 return hash_update<64>(Head::get_hash(), ser.get_hash());
395 template<typename C, typename Head, typename T>
396 char *Protocol::FieldSerializer<C, Head, T>::serialize(const C &com, char *buf, char *end) const
398 buf = Head::serialize(com, buf, end);
399 return ser.serialize(com.*ptr, buf, end);
402 template<typename C, typename Head, typename T>
403 const char *Protocol::FieldSerializer<C, Head, T>::deserialize(C &com, const char *buf, const char *end) const
405 buf = Head::deserialize(com, buf, end);
406 return ser.deserialize(com.*ptr, buf, end);
411 Protocol::PacketTypeDef<P>::PacketTypeDef(unsigned i):
413 serializer(std::make_unique<Serializer<P>>())
418 void Protocol::PacketTypeDef<P>::set_serializer(const S &ser)
420 serializer = std::make_unique<S>(ser);
424 char *Protocol::PacketTypeDef<P>::serialize(const P &pkt, char *buf, char *end) const
426 return serializer->serialize(pkt, buf, end);
430 const char *Protocol::PacketTypeDef<P>::deserialize(P &pkt, const char *buf, const char *end) const
432 return serializer->deserialize(pkt, buf, end);
436 const char *Protocol::PacketTypeDef<P>::dispatch(ReceiverBase &rcv, const char *buf, const char *end) const
438 PacketReceiver<P> *prcv = dynamic_cast<PacketReceiver<P> *>(&rcv);
440 throw bad_packet("unsupported");
442 buf = deserialize(pkt, buf, end);
448 template<typename P, typename S>
449 Protocol::PacketDefBuilder<P, S>::PacketDefBuilder(const Protocol &p, PacketTypeDef<P> &k, const S &s):
455 template<typename P, typename S>
457 Protocol::PacketDefBuilder<P, typename S::template Next<T>> Protocol::PacketDefBuilder<P, S>::fields(T P::*ptr)
459 typename S::template Next<T> next_ser(serializer, ptr, protocol);
460 pktdef.set_serializer(next_ser);
461 return PacketDefBuilder<P, typename S::template Next<T>>(protocol, pktdef, next_ser);