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 402b84a0633cdeb4dbe45c463e2f9676af911709..5e82a80d7daaf17fb130752fd870380e2b78c329 100644 (file)
--- a/source/net/protocol.cpp
+++ b/source/net/protocol.cpp
@@ -1,18 +1,17 @@
+#include "protocol.h"
 #include <cstring>
 #include <string>
 #include <msp/core/maputils.h>
 #include <msp/strings/format.h>
 #include <msp/strings/lexicalcast.h>
-#include "protocol.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, Serializer<PacketHeader>>(*this, header_def, Serializer<PacketHeader>())
                .fields(&PacketHeader::type, &PacketHeader::length);
@@ -44,24 +43,43 @@ 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;
        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);
-       ptr = pdef.dispatch(rcv, ptr, ptr+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