Add a dynamic receiver class for more flexible packet handling

[libs/net.git] / source / net / protocol.h

diff --git a/source/net/protocol.h b/source/net/protocol.h
index f040a69ef1293665b3f38c79387706c04bf75e05..5051338f3911558c8e2ee19fe2d0665c0e10eec3 100644 (file)
--- a/source/net/protocol.h
+++ b/source/net/protocol.h
@@ -7,27 +7,38 @@
 #include <stdexcept>
 #include <vector>
 #include <msp/core/hash.h>
+#include "mspnet_api.h"
 #include "receiver.h"
 
 namespace Msp {
 namespace Net {
 
-class bad_packet: public std::runtime_error
+class MSPNET_API bad_packet: public std::runtime_error
 {
 public:
        bad_packet(const std::string &w): std::runtime_error(w) { }
 };
 
 
-class buffer_error: public std::runtime_error
+class MSPNET_API buffer_error: public std::runtime_error
 {
 public:
        buffer_error(const std::string &w): std::runtime_error(w) { }
 };
 
 
-class Protocol
+class MSPNET_API Protocol
 {
+public:
+       struct PacketHeader
+       {
+               std::uint16_t type = 0;
+               std::uint16_t length = 0;
+
+               PacketHeader() = default;
+               PacketHeader(std::uint16_t, std::uint16_t);
+       };
+
 private:
        template<typename T, std::uint8_t K>
        struct BasicTraits;
@@ -136,6 +147,7 @@ private:
                virtual unsigned get_class_id() const = 0;
                unsigned get_id() const { return id; }
                virtual std::uint64_t get_hash() const = 0;
+               virtual const char *deserialize(Variant &, const char *, const char *) const = 0;
                virtual const char *dispatch(ReceiverBase &, const char *, const char *) const = 0;
        };
 
@@ -158,6 +170,7 @@ private:
                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 *deserialize(Variant &, const char *, const char *) const override;
                const char *dispatch(ReceiverBase &, const char *, const char *) const override;
        };
 
@@ -179,22 +192,13 @@ private:
                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);
-       };
-
        PacketTypeDef<PacketHeader> header_def;
-       unsigned next_packet_id;
+       unsigned next_packet_id = 1;
        std::map<unsigned, std::unique_ptr<PacketDefBase>> packet_class_defs;
        std::map<unsigned, PacketDefBase *> packet_id_defs;
 
 protected:
-       Protocol(unsigned = 1);
+       Protocol();
 
 private:
        static unsigned get_next_packet_class_id();
@@ -205,12 +209,6 @@ private:
        void add_packet(std::unique_ptr<PacketDefBase>);
 
 protected:
-       template<typename P>
-       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();
 
@@ -225,10 +223,19 @@ protected:
 
 public:
        template<typename P>
-       std::size_t serialize(const P &, char *, std::size_t) const;
+       bool has_packet() const { return packet_class_defs.count(get_packet_class_id<P>()); }
+
+       template<typename P>
+       unsigned get_packet_id() const { return get_item(packet_class_defs, get_packet_class_id<P>())->get_id(); }
 
+       unsigned get_max_packet_id() const;
+
+       template<typename P>
+       std::size_t serialize(const P &, char *, std::size_t, unsigned = 0) const;
+
+       bool get_packet_header(PacketHeader &, const char *, std::size_t) const;
        std::size_t get_packet_size(const char *, std::size_t) const;
-       std::size_t dispatch(ReceiverBase &, const char *, std::size_t) const;
+       std::size_t dispatch(ReceiverBase &, const char *, std::size_t, unsigned = 0) const;
 
        std::uint64_t get_hash() const;
 };
@@ -242,20 +249,14 @@ unsigned Protocol::get_packet_class_id()
 }
 
 template<typename P>
-Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add(unsigned id)
+Protocol::PacketDefBuilder<P, Protocol::Serializer<P>> Protocol::add()
 {
-       std::unique_ptr<PacketTypeDef<P>> pdef = std::make_unique<PacketTypeDef<P>>(id);
+       std::unique_ptr<PacketTypeDef<P>> pdef = std::make_unique<PacketTypeDef<P>>(next_packet_id++);
        PacketDefBuilder<P, Serializer<P>> next(*this, *pdef, Serializer<P>());
        add_packet(move(pdef));
        return next;
 }
 
-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
 {
@@ -264,14 +265,14 @@ const Protocol::PacketTypeDef<P> &Protocol::get_packet_by_class() const
 }
 
 template<typename P>
-std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size) const
+std::size_t Protocol::serialize(const P &pkt, char *buf, std::size_t size, unsigned base_id) 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);
+       header_def.serialize(PacketHeader(base_id+pdef.get_id(), size), buf, buf+4);
        return size;
 }
 
@@ -432,6 +433,15 @@ const char *Protocol::PacketTypeDef<P>::deserialize(P &pkt, const char *buf, con
        return serializer->deserialize(pkt, buf, end);
 }
 
+template<typename P>
+const char *Protocol::PacketTypeDef<P>::deserialize(Variant &var_pkt, const char *buf, const char *end) const
+{
+       P pkt;
+       const char *ptr = serializer->deserialize(pkt, buf, end);
+       var_pkt = std::move(pkt);
+       return ptr;
+}
+
 template<typename P>
 const char *Protocol::PacketTypeDef<P>::dispatch(ReceiverBase &rcv, const char *buf, const char *end) const
 {