Add a dynamic receiver class for more flexible packet handling

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

diff --git a/source/net/protocol.cpp b/source/net/protocol.cpp
index 17e4310f5196c2f5c599cc103c8d8d5c6cf36430..5e82a80d7daaf17fb130752fd870380e2b78c329 100644 (file)
--- a/source/net/protocol.cpp
+++ b/source/net/protocol.cpp
@@ -1,42 +1,36 @@
+#include "protocol.h"
 #include <cstring>
 #include <string>
-#include <msp/core/hash.h>
 #include <msp/core/maputils.h>
 #include <msp/strings/format.h>
 #include <msp/strings/lexicalcast.h>
-#include "protocol.h"
-#include "protocol_impl.h"
 
 using namespace std;
 
 namespace Msp {
 namespace Net {
 
-Protocol::Protocol(unsigned npi):
-       header_def(0),
-       next_packet_id(npi)
+Protocol::Protocol():
+       header_def(0)
 {
-       PacketDefBuilder<PacketHeader, NullSerializer<PacketHeader> >(*this, header_def, NullSerializer<PacketHeader>())
-               (&PacketHeader::type)(&PacketHeader::length);
+       PacketDefBuilder<PacketHeader, Serializer<PacketHeader>>(*this, header_def, Serializer<PacketHeader>())
+               .fields(&PacketHeader::type, &PacketHeader::length);
 }
 
-Protocol::~Protocol()
+unsigned Protocol::get_next_packet_class_id()
 {
-       for(map<unsigned, PacketDefBase *>::iterator i=packet_class_defs.begin(); i!=packet_class_defs.end(); ++i)
-               delete i->second;
+       static unsigned next_id = 1;
+       return next_id++;
 }
 
-void Protocol::add_packet(PacketDefBase *pdef)
+void Protocol::add_packet(unique_ptr<PacketDefBase> pdef)
 {
-       PacketDefBase *&ptr = packet_class_defs[pdef->get_class_id()];
+       unique_ptr<PacketDefBase> &ptr = packet_class_defs[pdef->get_class_id()];
        if(ptr)
-       {
                packet_id_defs.erase(ptr->get_id());
-               delete ptr;
-       }
-       ptr = pdef;
-       if(unsigned id = pdef->get_id())
-               packet_id_defs[id] = pdef;
+       ptr = move(pdef);
+       if(unsigned id = ptr->get_id())
+               packet_id_defs[id] = ptr.get();
 }
 
 const Protocol::PacketDefBase &Protocol::get_packet_by_class_id(unsigned id) const
@@ -49,32 +43,54 @@ const Protocol::PacketDefBase &Protocol::get_packet_by_id(unsigned id) const
        return *get_item(packet_id_defs, id);
 }
 
-size_t Protocol::dispatch(ReceiverBase &rcv, const char *buf, size_t size) const
+unsigned Protocol::get_max_packet_id() const
+{
+       if(packet_id_defs.empty())
+               return 0;
+       return prev(packet_id_defs.end())->first;
+}
+
+size_t Protocol::dispatch(ReceiverBase &rcv, const char *buf, size_t size, unsigned base_id) const
 {
        PacketHeader header;
-       buf = header_def.deserialize(header, buf, buf+size);
+       const char *ptr = header_def.deserialize(header, buf, buf+size);
        if(header.length>size)
                throw bad_packet("truncated");
-       const PacketDefBase &pdef = get_packet_by_id(header.type);
-       const char *ptr = pdef.dispatch(rcv, buf, buf+header.length);
+       const PacketDefBase &pdef = get_packet_by_id(header.type-base_id);
+       if(DynamicReceiver *drcv = dynamic_cast<DynamicReceiver *>(&rcv))
+       {
+               Variant pkt;
+               ptr = pdef.deserialize(pkt, ptr, ptr+header.length);
+               drcv->receive(pdef.get_id(), pkt);
+       }
+       else
+               ptr = pdef.dispatch(rcv, ptr, ptr+header.length);
        return ptr-buf;
 }
 
-size_t Protocol::get_packet_size(const char *buf, size_t size) const
+bool Protocol::get_packet_header(PacketHeader &header, const char *buf, size_t size) const
 {
        if(size<4)
-               return 0;
-       PacketHeader header;
+               return false;
        header_def.deserialize(header, buf, buf+size);
-       return header.length;
+       return true;
+}
+
+size_t Protocol::get_packet_size(const char *buf, size_t size) const
+{
+       PacketHeader header;
+       return (get_packet_header(header, buf, size) ? header.length : 0);
 }
 
 uint64_t Protocol::get_hash() const
 {
-       string description;
-       for(PacketMap::const_iterator i=packet_id_defs.begin(); i!=packet_id_defs.end(); ++i)
-               description += format("%d:%s\n", i->first, i->second->describe());
-       return hash<64>(description);
+       uint64_t result = hash<64>(packet_id_defs.size());
+       for(auto &kvp: packet_id_defs)
+       {
+               hash_update<64>(result, kvp.first);
+               hash_update<64>(result, kvp.second->get_hash());
+       }
+       return result;
 }
 
 
@@ -154,18 +170,11 @@ const char *Protocol::StringSerializer::deserialize(string &str, const char *buf
 }
 
 
-unsigned Protocol::PacketDefBase::next_class_id = 1;
-
 Protocol::PacketDefBase::PacketDefBase(unsigned i):
        id(i)
 { }
 
 
-Protocol::PacketHeader::PacketHeader():
-       type(0),
-       length(0)
-{ }
-
 Protocol::PacketHeader::PacketHeader(uint16_t t, uint16_t l):
        type(t),
        length(l)