Merge pull request #1036 from gavinandresen/pubsubcleanup

Remove half-implemented publish/subscribe system

src/net.cpp

@@ -289,105 +289,6 @@ void AddressCurrentlyConnected(const CService& addr)
 
 
 
-void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1)
-{
-    // If the dialog might get closed before the reply comes back,
-    // call this in the destructor so it doesn't get called after it's deleted.
-    CRITICAL_BLOCK(cs_vNodes)
-    {
-        BOOST_FOREACH(CNode* pnode, vNodes)
-        {
-            CRITICAL_BLOCK(pnode->cs_mapRequests)
-            {
-                for (map<uint256, CRequestTracker>::iterator mi = pnode->mapRequests.begin(); mi != pnode->mapRequests.end();)
-                {
-                    CRequestTracker& tracker = (*mi).second;
-                    if (tracker.fn == fn && tracker.param1 == param1)
-                        pnode->mapRequests.erase(mi++);
-                    else
-                        mi++;
-                }
-            }
-        }
-    }
-}
-
-
-
-
-
-
-
-//
-// Subscription methods for the broadcast and subscription system.
-// Channel numbers are message numbers, i.e. MSG_TABLE and MSG_PRODUCT.
-//
-// The subscription system uses a meet-in-the-middle strategy.
-// With 100,000 nodes, if senders broadcast to 1000 random nodes and receivers
-// subscribe to 1000 random nodes, 99.995% (1 - 0.99^1000) of messages will get through.
-//
-
-bool AnySubscribed(unsigned int nChannel)
-{
-    if (pnodeLocalHost->IsSubscribed(nChannel))
-        return true;
-    CRITICAL_BLOCK(cs_vNodes)
-        BOOST_FOREACH(CNode* pnode, vNodes)
-            if (pnode->IsSubscribed(nChannel))
-                return true;
-    return false;
-}
-
-bool CNode::IsSubscribed(unsigned int nChannel)
-{
-    if (nChannel >= vfSubscribe.size())
-        return false;
-    return vfSubscribe[nChannel];
-}
-
-void CNode::Subscribe(unsigned int nChannel, unsigned int nHops)
-{
-    if (nChannel >= vfSubscribe.size())
-        return;
-
-    if (!AnySubscribed(nChannel))
-    {
-        // Relay subscribe
-        CRITICAL_BLOCK(cs_vNodes)
-            BOOST_FOREACH(CNode* pnode, vNodes)
-                if (pnode != this)
-                    pnode->PushMessage("subscribe", nChannel, nHops);
-    }
-
-    vfSubscribe[nChannel] = true;
-}
-
-void CNode::CancelSubscribe(unsigned int nChannel)
-{
-    if (nChannel >= vfSubscribe.size())
-        return;
-
-    // Prevent from relaying cancel if wasn't subscribed
-    if (!vfSubscribe[nChannel])
-        return;
-    vfSubscribe[nChannel] = false;
-
-    if (!AnySubscribed(nChannel))
-    {
-        // Relay subscription cancel
-        CRITICAL_BLOCK(cs_vNodes)
-            BOOST_FOREACH(CNode* pnode, vNodes)
-                if (pnode != this)
-                    pnode->PushMessage("sub-cancel", nChannel);
-    }
-}
-
-
-
-
-
-
-
 
 
 CNode* FindNode(const CNetAddr& ip)
@@ -486,13 +387,6 @@ void CNode::CloseSocketDisconnect()
 
 void CNode::Cleanup()
 {
-    // All of a nodes broadcasts and subscriptions are automatically torn down
-    // when it goes down, so a node has to stay up to keep its broadcast going.
-
-    // Cancel subscriptions
-    for (unsigned int nChannel = 0; nChannel < vfSubscribe.size(); nChannel++)
-        if (vfSubscribe[nChannel])
-            CancelSubscribe(nChannel);
 }
 
 

src/net.h

@@ -29,7 +29,6 @@ extern int nBestHeight;
 
 inline unsigned int ReceiveBufferSize() { return 1000*GetArg("-maxreceivebuffer", 10*1000); }
 inline unsigned int SendBufferSize() { return 1000*GetArg("-maxsendbuffer", 10*1000); }
-static const unsigned int PUBLISH_HOPS = 5;
 
 bool RecvLine(SOCKET hSocket, std::string& strLine);
 bool GetMyExternalIP(CNetAddr& ipRet);
@@ -37,8 +36,6 @@ void AddressCurrentlyConnected(const CService& addr);
 CNode* FindNode(const CNetAddr& ip);
 CNode* FindNode(const CService& ip);
 CNode* ConnectNode(CAddress addrConnect, int64 nTimeout=0);
-void AbandonRequests(void (*fn)(void*, CDataStream&), void* param1);
-bool AnySubscribed(unsigned int nChannel);
 void MapPort(bool fMapPort);
 bool BindListenPort(std::string& strError=REF(std::string()));
 void StartNode(void* parg);
@@ -160,9 +157,6 @@ public:
     CCriticalSection cs_inventory;
     std::multimap<int64, CInv> mapAskFor;
 
-    // publish and subscription
-    std::vector<char> vfSubscribe;
-
     CNode(SOCKET hSocketIn, CAddress addrIn, bool fInboundIn=false)
     {
         nServices = 0;
@@ -192,7 +186,6 @@ public:
         hashLastGetBlocksEnd = 0;
         nStartingHeight = -1;
         fGetAddr = false;
-        vfSubscribe.assign(256, false);
         nMisbehavior = 0;
         setInventoryKnown.max_size(SendBufferSize() / 1000);
 
@@ -634,58 +627,4 @@ inline void RelayMessage<>(const CInv& inv, const CDataStream& ss)
 }
 
 
-
-
-
-
-
-
-//
-// Templates for the publish and subscription system.
-// The object being published as T& obj needs to have:
-//   a set<unsigned int> setSources member
-//   specializations of AdvertInsert and AdvertErase
-// Currently implemented for CTable and CProduct.
-//
-
-template<typename T>
-void AdvertStartPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
-{
-    // Add to sources
-    obj.setSources.insert(pfrom->addr.ip);
-
-    if (!AdvertInsert(obj))
-        return;
-
-    // Relay
-    CRITICAL_BLOCK(cs_vNodes)
-        BOOST_FOREACH(CNode* pnode, vNodes)
-            if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
-                pnode->PushMessage("publish", nChannel, nHops, obj);
-}
-
-template<typename T>
-void AdvertStopPublish(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
-{
-    uint256 hash = obj.GetHash();
-
-    CRITICAL_BLOCK(cs_vNodes)
-        BOOST_FOREACH(CNode* pnode, vNodes)
-            if (pnode != pfrom && (nHops < PUBLISH_HOPS || pnode->IsSubscribed(nChannel)))
-                pnode->PushMessage("pub-cancel", nChannel, nHops, hash);
-
-    AdvertErase(obj);
-}
-
-template<typename T>
-void AdvertRemoveSource(CNode* pfrom, unsigned int nChannel, unsigned int nHops, T& obj)
-{
-    // Remove a source
-    obj.setSources.erase(pfrom->addr.ip);
-
-    // If no longer supported by any sources, cancel it
-    if (obj.setSources.empty())
-        AdvertStopPublish(pfrom, nChannel, nHops, obj);
-}
-
 #endif