1 #ifndef MSP_NET_PROTOCOL_H_
2 #define MSP_NET_PROTOCOL_H_
9 #include <msp/core/hash.h>
10 #include "mspnet_api.h"
16 class MSPNET_API bad_packet: public std::runtime_error
19 bad_packet(const std::string &w): std::runtime_error(w) { }
23 class MSPNET_API buffer_error: public std::runtime_error
26 buffer_error(const std::string &w): std::runtime_error(w) { }
30 class MSPNET_API Protocol
33 template<typename T, std::uint8_t K>
46 BasicSerializer(const Protocol &) { }
48 std::uint64_t get_hash() const { return Traits<T>::signature; }
49 char *serialize(const T &, char *, char *) const;
50 const char *deserialize(T &, const char *, const char *) const;
53 class StringSerializer
56 BasicSerializer<std::uint16_t> length_serializer;
59 StringSerializer(const Protocol &);
61 std::uint64_t get_hash() const;
62 char *serialize(const std::string &, char *, char *) const;
63 const char *deserialize(std::string &, const char *, const char *) const;
70 BasicSerializer<std::uint16_t> length_serializer;
71 typename Traits<typename A::value_type>::Serializer element_serializer;
74 ArraySerializer(const Protocol &);
76 std::uint64_t get_hash() const;
77 char *serialize(const A &, char *, char *) const;
78 const char *deserialize(A &, const char *, const char *) const;
82 class CompoundSerializer
85 const Serializer<C> &serializer;
88 CompoundSerializer(const Protocol &);
90 std::uint64_t get_hash() const;
91 char *serialize(const C &, char *, char *) const;
92 const char *deserialize(C &, const char *, const char *) const;
95 template<typename C, typename Head, typename T>
96 class FieldSerializer: public Head
100 using Next = FieldSerializer<C, FieldSerializer<C, Head, T>, N>;
104 typename Traits<T>::Serializer ser;
107 FieldSerializer(const Head &, T C::*, const Protocol &);
109 std::uint64_t get_hash() const;
110 char *serialize(const C &, char *, char *) const;
111 const char *deserialize(C &, const char *, const char *) const;
119 using Next = FieldSerializer<C, Serializer<C>, N>;
121 virtual ~Serializer() = default;
123 virtual std::uint64_t get_hash() const { return 0; }
124 virtual char *serialize(const C &, char *b, char *) const { return b; }
125 virtual const char *deserialize(C &, const char *b, const char *) const { return b; }
133 PacketDefBase(unsigned);
135 virtual ~PacketDefBase() = default;
137 virtual unsigned get_class_id() const = 0;
138 unsigned get_id() const { return id; }
139 virtual std::uint64_t get_hash() const = 0;
140 virtual const char *dispatch(ReceiverBase &, const char *, const char *) const = 0;
144 class PacketTypeDef: public PacketDefBase
147 std::unique_ptr<Serializer<P>> serializer;
150 PacketTypeDef(unsigned);
152 unsigned get_class_id() const override { return get_packet_class_id<P>(); }
155 void set_serializer(const S &);
157 const Serializer<P> &get_serializer() const { return *serializer; }
159 std::uint64_t get_hash() const override { return serializer->get_hash(); }
160 char *serialize(const P &, char *, char *) const;
161 const char *deserialize(P &, const char *, const char *) const;
162 const char *dispatch(ReceiverBase &, const char *, const char *) const override;
165 template<typename P, typename S>
166 class PacketDefBuilder
169 const Protocol &protocol;
170 PacketTypeDef<P> &pktdef;
174 PacketDefBuilder(const Protocol &, PacketTypeDef<P> &, const S &);
177 PacketDefBuilder<P, typename S::template Next<T>> fields(T P::*);
179 template<typename T1, typename T2, typename... Rest>
180 auto fields(T1 P::*first, T2 P::*second, Rest P::*...rest) { return fields(first).fields(second, rest...); }
185 std::uint16_t type = 0;
186 std::uint16_t length = 0;
188 PacketHeader() = default;
189 PacketHeader(std::uint16_t, std::uint16_t);
192 PacketTypeDef<PacketHeader> header_def;
193 unsigned next_packet_id;
194 std::map<unsigned, std::unique_ptr<PacketDefBase>> packet_class_defs;
195 std::map<unsigned, PacketDefBase *> packet_id_defs;
198 Protocol(unsigned = 1);
201 static unsigned get_next_packet_class_id();
204 static unsigned get_packet_class_id();
206 void add_packet(std::unique_ptr<PacketDefBase>);
210 PacketDefBuilder<P, Serializer<P>> add(unsigned);
212 template<typename P, typename T, typename... Rest>
213 auto add(unsigned id, T P::*field, Rest P::*...rest) { return add<P>(id).fields(field, rest...); }
216 PacketDefBuilder<P, Serializer<P>> add();
218 template<typename P, typename T, typename... Rest>
219 auto add(T P::*field, Rest P::*...rest) { return add<P>().fields(field, rest...); }
221 const PacketDefBase &get_packet_by_class_id(unsigned) const;
222 const PacketDefBase &get_packet_by_id(unsigned) const;
225 const PacketTypeDef<P> &get_packet_by_class() const;
229 std::size_t serialize(const P &, char *, std::size_t) const;
231 std::size_t get_packet_size(const char *, std::size_t) const;
232 std::size_t dispatch(ReceiverBase &, const char *, std::size_t) const;
234 std::uint64_t get_hash() const;
239 unsigned Protocol::get_packet_class_id()
241 static unsigned id = get_next_packet_class_id();
246 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add(unsigned id)
248 std::unique_ptr<PacketTypeDef<P>> pdef = std::make_unique<PacketTypeDef<P>>(id);
249 PacketDefBuilder<P, Serializer<P>> next(*this, *pdef, Serializer<P>());
250 add_packet(move(pdef));
255 Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add()
257 return add<P>(next_packet_id++);
261 const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
263 const PacketDefBase &pdef = get_packet_by_class_id(get_packet_class_id<P>());
264 return static_cast<const PacketTypeDef<P> &>(pdef);
268 std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size) const
270 const PacketTypeDef<P> &pdef = get_packet_by_class<P>();
272 throw std::invalid_argument("no packet id");
273 char *ptr = pdef.serialize(pkt, buf+4, buf+size);
275 header_def.serialize(PacketHeader(pdef.get_id(), size), buf, buf+4);
280 template<typename T, std::uint8_t K>
281 struct Protocol::BasicTraits
283 static const std::uint16_t signature = K | (sizeof(T)<<8);
284 typedef BasicSerializer<T> Serializer;
288 struct Protocol::Traits
290 static const std::uint16_t signature = 'C';
291 typedef CompoundSerializer<T> Serializer;
294 template<> struct Protocol::Traits<bool>: BasicTraits<bool, 'B'> { };
295 template<> struct Protocol::Traits<std::int8_t>: BasicTraits<std::int8_t, 'I'> { };
296 template<> struct Protocol::Traits<std::uint8_t>: BasicTraits<std::uint8_t, 'U'> { };
297 template<> struct Protocol::Traits<std::int16_t>: BasicTraits<std::int16_t, 'I'> { };
298 template<> struct Protocol::Traits<std::uint16_t>: BasicTraits<std::uint16_t, 'U'> { };
299 template<> struct Protocol::Traits<std::int32_t>: BasicTraits<std::int32_t, 'I'> { };
300 template<> struct Protocol::Traits<std::uint32_t>: BasicTraits<std::uint32_t, 'U'> { };
301 template<> struct Protocol::Traits<std::int64_t>: BasicTraits<std::int64_t, 'I'> { };
302 template<> struct Protocol::Traits<std::uint64_t>: BasicTraits<std::uint64_t, 'U'> { };
303 template<> struct Protocol::Traits<float>: BasicTraits<float, 'F'> { };
304 template<> struct Protocol::Traits<double>: BasicTraits<double, 'F'> { };
306 template<> struct Protocol::Traits<std::string>
308 static const std::uint16_t signature = 'S';
309 typedef StringSerializer Serializer;
313 struct Protocol::Traits<std::vector<T>>
315 static const std::uint16_t signature = 'A';
316 typedef ArraySerializer<std::vector<T>> Serializer;
320 inline std::uint64_t Protocol::StringSerializer::get_hash() const
322 return Traits<std::string>::signature;
327 Protocol::ArraySerializer<A>::ArraySerializer(const Protocol &proto):
328 length_serializer(proto),
329 element_serializer(proto)
333 std::uint64_t Protocol::ArraySerializer<A>::get_hash() const
335 return hash_round<64>(element_serializer.get_hash(), 'A');
339 char *Protocol::ArraySerializer<A>::serialize(const A &array, char *buf, char *end) const
341 buf = length_serializer.serialize(array.size(), buf, end);
342 for(const auto &e: array)
343 buf = element_serializer.serialize(e, buf, end);
348 const char *Protocol::ArraySerializer<A>::deserialize(A &array, const char *buf, const char *end) const
350 std::uint16_t length;
351 buf = length_serializer.deserialize(length, buf, end);
352 array.resize(length);
353 for(unsigned i=0; i<length; ++i)
354 buf = element_serializer.deserialize(array[i], buf, end);
360 Protocol::CompoundSerializer<C>::CompoundSerializer(const Protocol &proto):
361 serializer(proto.get_packet_by_class<C>().get_serializer())
365 std::uint64_t Protocol::CompoundSerializer<C>::get_hash() const
367 return hash_round<64>(serializer.get_hash(), 'C');
371 char *Protocol::CompoundSerializer<C>::serialize(const C &com, char *buf, char *end) const
373 return serializer.serialize(com, buf, end);
377 const char *Protocol::CompoundSerializer<C>::deserialize(C &com, const char *buf, const char *end) const
379 return serializer.deserialize(com, buf, end);
383 template<typename C, typename Head, typename T>
384 Protocol::FieldSerializer<C, Head, T>::FieldSerializer(const Head &h, T C::*p, const Protocol &proto):
390 template<typename C, typename Head, typename T>
391 std::uint64_t Protocol::FieldSerializer<C, Head, T>::get_hash() const
393 return hash_update<64>(Head::get_hash(), ser.get_hash());
396 template<typename C, typename Head, typename T>
397 char *Protocol::FieldSerializer<C, Head, T>::serialize(const C &com, char *buf, char *end) const
399 buf = Head::serialize(com, buf, end);
400 return ser.serialize(com.*ptr, buf, end);
403 template<typename C, typename Head, typename T>
404 const char *Protocol::FieldSerializer<C, Head, T>::deserialize(C &com, const char *buf, const char *end) const
406 buf = Head::deserialize(com, buf, end);
407 return ser.deserialize(com.*ptr, buf, end);
412 Protocol::PacketTypeDef<P>::PacketTypeDef(unsigned i):
414 serializer(std::make_unique<Serializer<P>>())
419 void Protocol::PacketTypeDef<P>::set_serializer(const S &ser)
421 serializer = std::make_unique<S>(ser);
425 char *Protocol::PacketTypeDef<P>::serialize(const P &pkt, char *buf, char *end) const
427 return serializer->serialize(pkt, buf, end);
431 const char *Protocol::PacketTypeDef<P>::deserialize(P &pkt, const char *buf, const char *end) const
433 return serializer->deserialize(pkt, buf, end);
437 const char *Protocol::PacketTypeDef<P>::dispatch(ReceiverBase &rcv, const char *buf, const char *end) const
439 PacketReceiver<P> *prcv = dynamic_cast<PacketReceiver<P> *>(&rcv);
441 throw bad_packet("unsupported");
443 buf = deserialize(pkt, buf, end);
449 template<typename P, typename S>
450 Protocol::PacketDefBuilder<P, S>::PacketDefBuilder(const Protocol &p, PacketTypeDef<P> &k, const S &s):
456 template<typename P, typename S>
458 Protocol::PacketDefBuilder<P, typename S::template Next<T>> Protocol::PacketDefBuilder<P, S>::fields(T P::*ptr)
460 typename S::template Next<T> next_ser(serializer, ptr, protocol);
461 pktdef.set_serializer(next_ser);
462 return PacketDefBuilder<P, typename S::template Next<T>>(protocol, pktdef, next_ser);