ICE-5649 handle null subscribers in IceStorm subscribe calls

1 files changed, 41 insertions, 21 deletions

diff --git a/cpp/src/IceStorm/TopicI.cpp b/cpp/src/IceStorm/TopicI.cpp
index 81f404c1b0b..1c46fc2b72e 100644
--- a/cpp/src/IceStorm/TopicI.cpp
+++ b/cpp/src/IceStorm/TopicI.cpp
@@ -76,7 +76,7 @@ public:
         //event->data.swap(Ice::ByteSeq(inParams.first, inParams.second));
         Ice::ByteSeq data(inParams.first, inParams.second);
         event->data.swap(data);
-        
+
         EventDataSeq v;
         v.push_back(event);
         _topic->publish(false, v);
@@ -85,7 +85,7 @@ public:
     }
 
 private:
-    
+
     const TopicImplPtr _topic;
     const InstancePtr _instance;
 };
@@ -340,7 +340,7 @@ public:
         CachedReadHelper unlock(_instance->node(), __FILE__, __LINE__);
         return _impl->getLinkInfoSeq();
     }
-    
+
     virtual Ice::IdentitySeq getSubscribers(const Ice::Current&) const
     {
         return _impl->getSubscribers();
@@ -415,7 +415,7 @@ TopicImpl::TopicImpl(
     try
     {
         __setNoDelete(true);
-        
+
         // TODO: If we want to improve the performance of the
         // non-replicated case we could allocate a null-topic impl here.
         _servant = new TopicI(this, instance);
@@ -450,7 +450,7 @@ TopicImpl::TopicImpl(
         _publisherPrx = _instance->publishAdapter()->add(new PublisherI(this, instance), pubid);
         _linkPrx = TopicLinkPrx::uncheckedCast(
             _instance->publishAdapter()->add(new TopicLinkI(this, instance), linkid));
-        
+
         //
         // Re-establish subscribers.
         //
@@ -562,6 +562,16 @@ trace(Ice::Trace& out, const InstancePtr& instance, const vector<SubscriberPtr>&
 void
 TopicImpl::subscribe(const QoS& origQoS, const Ice::ObjectPrx& obj)
 {
+    if(!obj)
+    {
+        TraceLevelsPtr traceLevels = _instance->traceLevels();
+        if(traceLevels->topic > 0)
+        {
+            Ice::Trace out(traceLevels->logger, traceLevels->topicCat);
+            out << "subscribe with null subscriber.";
+        }
+        throw NullSubscriber();
+    }
     Ice::Identity id = obj->ice_getIdentity();
     TraceLevelsPtr traceLevels = _instance->traceLevels();
     QoS qos = origQoS;
@@ -679,7 +689,7 @@ TopicImpl::subscribe(const QoS& origQoS, const Ice::ObjectPrx& obj)
             catch(const DatabaseException& ex)
             {
                 halt(_instance->communicator(), ex);
-            }   
+            }
         }
         Ice::IdentitySeq ids;
         ids.push_back(id);
@@ -716,7 +726,7 @@ TopicImpl::subscribe(const QoS& origQoS, const Ice::ObjectPrx& obj)
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _subscribers.push_back(subscriber);
@@ -727,6 +737,16 @@ TopicImpl::subscribe(const QoS& origQoS, const Ice::ObjectPrx& obj)
 Ice::ObjectPrx
 TopicImpl::subscribeAndGetPublisher(const QoS& qos, const Ice::ObjectPrx& obj)
 {
+    if(!obj)
+    {
+        TraceLevelsPtr traceLevels = _instance->traceLevels();
+        if(traceLevels->topic > 0)
+        {
+            Ice::Trace out(traceLevels->logger, traceLevels->topicCat);
+            out << "subscribe with null subscriber.";
+        }
+        throw NullSubscriber();
+    }
     Ice::Identity id = obj->ice_getIdentity();
 
     TraceLevelsPtr traceLevels = _instance->traceLevels();
@@ -799,7 +819,7 @@ TopicImpl::subscribeAndGetPublisher(const QoS& qos, const Ice::ObjectPrx& obj)
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _subscribers.push_back(subscriber);
@@ -829,7 +849,7 @@ TopicImpl::unsubscribe(const Ice::ObjectPrx& subscriber)
     {
         Ice::Trace out(traceLevels->logger, traceLevels->topicCat);
         out << _name << ": unsubscribe: " << _instance->communicator()->identityToString(id);
-        
+
         if(traceLevels->topic > 1)
         {
             out << " endpoints: " << IceStormInternal::describeEndpoints(subscriber);
@@ -922,7 +942,7 @@ TopicImpl::link(const TopicPrx& topic, Ice::Int cost)
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _subscribers.push_back(subscriber);
@@ -940,7 +960,7 @@ TopicImpl::unlink(const TopicPrx& topic)
     }
 
     Ice::Identity id = topic->ice_getIdentity();
-    
+
     vector<SubscriberPtr>::const_iterator p = find(_subscribers.begin(), _subscribers.end(), id);
     if(p == _subscribers.end())
     {
@@ -1032,7 +1052,7 @@ Ice::IdentitySeq
 TopicImpl::getSubscribers() const
 {
     IceUtil::Mutex::Lock sync(_subscribersMutex);
-    
+
     Ice::IdentitySeq subscribers;
     for(vector<SubscriberPtr>::const_iterator p = _subscribers.begin(); p != _subscribers.end(); ++p)
     {
@@ -1261,7 +1281,7 @@ TopicImpl::publish(bool forwarded, const EventDataSeq& events)
         generation = unlock.generation();
     }
 
-    
+
     // Tell the master to reap this set of subscribers. This is an
     // AMI invocation so it shouldn't block the caller (in the
     // typical case) we do it outside of the mutex lock for
@@ -1285,7 +1305,7 @@ TopicImpl::observerAddSubscriber(const LogUpdate& llu, const SubscriberRecord& r
     {
         Ice::Trace out(traceLevels->logger, traceLevels->topicCat);
         out << _name << ": add replica observer: " << _instance->communicator()->identityToString(record.id);
-            
+
         if(traceLevels->topic > 1)
         {
             out << " endpoints: " << IceStormInternal::describeEndpoints(record.obj)
@@ -1344,7 +1364,7 @@ TopicImpl::observerAddSubscriber(const LogUpdate& llu, const SubscriberRecord& r
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _subscribers.push_back(subscriber);
@@ -1383,7 +1403,7 @@ TopicImpl::observerRemoveSubscriber(const LogUpdate& llu, const Ice::IdentitySeq
             _subscribers.erase(p);
         }
     }
-    
+
     // Next remove from the database.
     for(;;)
     {
@@ -1412,7 +1432,7 @@ TopicImpl::observerRemoveSubscriber(const LogUpdate& llu, const Ice::IdentitySeq
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 }
 
@@ -1487,7 +1507,7 @@ TopicImpl::destroyInternal(const LogUpdate& origLLU, bool master)
 
             // Erase all subscriber records and the topic record.
             SubscriberMap subscriberMap(connection, subscriberDbName);
-            
+
             IceStorm::SubscriberRecordKey key;
             key.topic = _id;
             SubscriberMap::iterator p = subscriberMap.find(key);
@@ -1518,7 +1538,7 @@ TopicImpl::destroyInternal(const LogUpdate& origLLU, bool master)
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _instance->topicAdapter()->remove(_id);
@@ -1571,7 +1591,7 @@ TopicImpl::removeSubscribers(const Ice::IdentitySeq& ids)
                 SubscriberRecordKey key;
                 key.topic = _id;
                 key.id = *id;
-                
+
                 SubscriberMap subscriberMap(connection, subscriberDbName);
                 subscriberMap.erase(key);
             }
@@ -1590,7 +1610,7 @@ TopicImpl::removeSubscribers(const Ice::IdentitySeq& ids)
         catch(const DatabaseException& ex)
         {
             halt(_instance->communicator(), ex);
-        }       
+        }
     }
 
     _instance->observers()->removeSubscriber(llu, _name, ids);