1 #ifndef MSP_NET_PROTOCOL_H_
2 #define MSP_NET_PROTOCOL_H_
8 #include <msp/core/hash.h>
14 class bad_packet: public std::runtime_error
17 bad_packet(const std::string &w): std::runtime_error(w) { }
21 class buffer_error: public std::runtime_error
24 buffer_error(const std::string &w): std::runtime_error(w) { }
31 template<typename T, std::uint8_t K>
44 BasicSerializer(const Protocol &) { }
46 std::uint64_t get_hash() const { return Traits<T>::signature; }
47 char *serialize(const T &, char *, char *) const;
48 const char *deserialize(T &, const char *, const char *) const;
51 class StringSerializer
54 BasicSerializer<std::uint16_t> length_serializer;
57 StringSerializer(const Protocol &);
59 std::uint64_t get_hash() const;
60 char *serialize(const std::string &, char *, char *) const;
61 const char *deserialize(std::string &, const char *, const char *) const;
68 BasicSerializer<std::uint16_t> length_serializer;
69 typename Traits<typename A::value_type>::Serializer element_serializer;
72 ArraySerializer(const Protocol &);
74 std::uint64_t get_hash() const;
75 char *serialize(const A &, char *, char *) const;
76 const char *deserialize(A &, const char *, const char *) const;
80 class CompoundSerializer
83 const Serializer<C> &serializer;
86 CompoundSerializer(const Protocol &);
88 std::uint64_t get_hash() const;
89 char *serialize(const C &, char *, char *) const;
90 const char *deserialize(C &, const char *, const char *) const;
93 template<typename C, typename Head, typename T>
94 class FieldSerializer: public Head
98 using Next = FieldSerializer<C, FieldSerializer<C, Head, T>, N>;
102 typename Traits<T>::Serializer ser;
105 FieldSerializer(const Head &, T C::*, const Protocol &);
107 std::uint64_t get_hash() const;
108 char *serialize(const C &, char *, char *) const;
109 const char *deserialize(C &, const char *, const char *) const;
117 using Next = FieldSerializer<C, Serializer<C>, N>;
119 virtual ~Serializer() = default;
121 virtual std::uint64_t get_hash() const { return 0; }
122 virtual char *serialize(const C &, char *b, char *) const { return b; }
123 virtual const char *deserialize(C &, const char *b, const char *) const { return b; }
131 PacketDefBase(unsigned);
133 virtual ~PacketDefBase() = default;
135 virtual unsigned get_class_id() const = 0;
136 unsigned get_id() const { return id; }
137 virtual std::uint64_t get_hash() const = 0;
138 virtual const char *dispatch(ReceiverBase &, const char *, const char *) const = 0;
142 class PacketTypeDef: public PacketDefBase
145 Serializer<P> *serializer;
148 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 typedef std::map<unsigned, PacketDefBase *> PacketMap;
193 PacketTypeDef<PacketHeader> header_def;
194 unsigned next_packet_id;
195 PacketMap packet_class_defs;
196 PacketMap packet_id_defs;
199 Protocol(unsigned = 1);
204 static unsigned get_next_packet_class_id();
207 static unsigned get_packet_class_id();
209 void add_packet(PacketDefBase *);
213 PacketDefBuilder<P, Serializer<P>> add(unsigned);
215 template<typename P, typename T, typename... Rest>
216 auto add(unsigned id, T P::*field, Rest P::*...rest) { return add<P>(id).fields(field, rest...); }
219 PacketDefBuilder<P, Serializer<P>> add();
221 template<typename P, typename T, typename... Rest>
222 auto add(T P::*field, Rest P::*...rest) { return add<P>().fields(field, rest...); }
224 const PacketDefBase &get_packet_by_class_id(unsigned) const;
225 const PacketDefBase &get_packet_by_id(unsigned) const;
228 const PacketTypeDef<P> &get_packet_by_class() const;
232 std::size_t serialize(const P &, char *, std::size_t) const;
234 std::size_t get_packet_size(const char *, std::size_t) const;
235 std::size_t dispatch(ReceiverBase &, const char *, std::size_t) const;
237 std::uint64_t get_hash() const;
242 unsigned Protocol::get_packet_class_id()
244 static unsigned id = get_next_packet_class_id();
249 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add(unsigned id)
251 PacketTypeDef<P> *pdef = new PacketTypeDef<P>(id);
253 return PacketDefBuilder<P, Serializer<P>>(*this, *pdef, Serializer<P>());
257 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add()
259 return add<P>(next_packet_id++);
263 const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
265 const PacketDefBase &pdef = get_packet_by_class_id(get_packet_class_id<P>());
266 return static_cast<const PacketTypeDef<P> &>(pdef);
270 std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size) const
272 const PacketTypeDef<P> &pdef = get_packet_by_class<P>();
274 throw std::invalid_argument("no packet id");
275 char *ptr = pdef.serialize(pkt, buf+4, buf+size);
277 header_def.serialize(PacketHeader(pdef.get_id(), size), buf, buf+4);
282 template<typename T, std::uint8_t K>
283 struct Protocol::BasicTraits
285 static const std::uint16_t signature = K | (sizeof(T)<<8);
286 typedef BasicSerializer<T> Serializer;
290 struct Protocol::Traits
292 static const std::uint16_t signature = 'C';
293 typedef CompoundSerializer<T> Serializer;
296 template<> struct Protocol::Traits<bool>: BasicTraits<bool, 'B'> { };
297 template<> struct Protocol::Traits<std::int8_t>: BasicTraits<std::int8_t, 'I'> { };
298 template<> struct Protocol::Traits<std::uint8_t>: BasicTraits<std::uint8_t, 'U'> { };
299 template<> struct Protocol::Traits<std::int16_t>: BasicTraits<std::int16_t, 'I'> { };
300 template<> struct Protocol::Traits<std::uint16_t>: BasicTraits<std::uint16_t, 'U'> { };
301 template<> struct Protocol::Traits<std::int32_t>: BasicTraits<std::int32_t, 'I'> { };
302 template<> struct Protocol::Traits<std::uint32_t>: BasicTraits<std::uint32_t, 'U'> { };
303 template<> struct Protocol::Traits<std::int64_t>: BasicTraits<std::int64_t, 'I'> { };
304 template<> struct Protocol::Traits<std::uint64_t>: BasicTraits<std::uint64_t, 'U'> { };
305 template<> struct Protocol::Traits<float>: BasicTraits<float, 'F'> { };
306 template<> struct Protocol::Traits<double>: BasicTraits<double, 'F'> { };
308 template<> struct Protocol::Traits<std::string>
310 static const std::uint16_t signature = 'S';
311 typedef StringSerializer Serializer;
315 struct Protocol::Traits<std::vector<T>>
317 static const std::uint16_t signature = 'A';
318 typedef ArraySerializer<std::vector<T>> Serializer;
322 inline std::uint64_t Protocol::StringSerializer::get_hash() const
324 return Traits<std::string>::signature;
329 Protocol::ArraySerializer<A>::ArraySerializer(const Protocol &proto):
330 length_serializer(proto),
331 element_serializer(proto)
335 std::uint64_t Protocol::ArraySerializer<A>::get_hash() const
337 return hash_round<64>(element_serializer.get_hash(), 'A');
341 char *Protocol::ArraySerializer<A>::serialize(const A &array, char *buf, char *end) const
343 buf = length_serializer.serialize(array.size(), buf, end);
344 for(const auto &e: array)
345 buf = element_serializer.serialize(e, buf, end);
350 const char *Protocol::ArraySerializer<A>::deserialize(A &array, const char *buf, const char *end) const
352 std::uint16_t length;
353 buf = length_serializer.deserialize(length, buf, end);
354 array.resize(length);
355 for(unsigned i=0; i<length; ++i)
356 buf = element_serializer.deserialize(array[i], buf, end);
362 Protocol::CompoundSerializer<C>::CompoundSerializer(const Protocol &proto):
363 serializer(proto.get_packet_by_class<C>().get_serializer())
367 std::uint64_t Protocol::CompoundSerializer<C>::get_hash() const
369 return hash_round<64>(serializer.get_hash(), 'C');
373 char *Protocol::CompoundSerializer<C>::serialize(const C &com, char *buf, char *end) const
375 return serializer.serialize(com, buf, end);
379 const char *Protocol::CompoundSerializer<C>::deserialize(C &com, const char *buf, const char *end) const
381 return serializer.deserialize(com, buf, end);
385 template<typename C, typename Head, typename T>
386 Protocol::FieldSerializer<C, Head, T>::FieldSerializer(const Head &h, T C::*p, const Protocol &proto):
392 template<typename C, typename Head, typename T>
393 std::uint64_t Protocol::FieldSerializer<C, Head, T>::get_hash() const
395 return hash_update<64>(Head::get_hash(), ser.get_hash());
398 template<typename C, typename Head, typename T>
399 char *Protocol::FieldSerializer<C, Head, T>::serialize(const C &com, char *buf, char *end) const
401 buf = Head::serialize(com, buf, end);
402 return ser.serialize(com.*ptr, buf, end);
405 template<typename C, typename Head, typename T>
406 const char *Protocol::FieldSerializer<C, Head, T>::deserialize(C &com, const char *buf, const char *end) const
408 buf = Head::deserialize(com, buf, end);
409 return ser.deserialize(com.*ptr, buf, end);
414 Protocol::PacketTypeDef<P>::PacketTypeDef(unsigned i):
416 serializer(new Serializer<P>)
420 Protocol::PacketTypeDef<P>::~PacketTypeDef()
427 void Protocol::PacketTypeDef<P>::set_serializer(const S &ser)
430 serializer = new S(ser);
434 char *Protocol::PacketTypeDef<P>::serialize(const P &pkt, char *buf, char *end) const
436 return serializer->serialize(pkt, buf, end);
440 const char *Protocol::PacketTypeDef<P>::deserialize(P &pkt, const char *buf, const char *end) const
442 return serializer->deserialize(pkt, buf, end);
446 const char *Protocol::PacketTypeDef<P>::dispatch(ReceiverBase &rcv, const char *buf, const char *end) const
448 PacketReceiver<P> *prcv = dynamic_cast<PacketReceiver<P> *>(&rcv);
450 throw bad_packet("unsupported");
452 buf = deserialize(pkt, buf, end);
458 template<typename P, typename S>
459 Protocol::PacketDefBuilder<P, S>::PacketDefBuilder(const Protocol &p, PacketTypeDef<P> &k, const S &s):
465 template<typename P, typename S>
467 Protocol::PacketDefBuilder<P, typename S::template Next<T>> Protocol::PacketDefBuilder<P, S>::fields(T P::*ptr)
469 typename S::template Next<T> next_ser(serializer, ptr, protocol);
470 pktdef.set_serializer(next_ser);
471 return PacketDefBuilder<P, typename S::template Next<T>>(protocol, pktdef, next_ser);