fixed addressbook crash at shutdown

AddressBook.cpp

@@ -151,13 +151,29 @@ namespace client
 	}	
 
 //---------------------------------------------------------------------
-	AddressBook::AddressBook (): m_IsLoaded (false), m_IsDownloading (false), 
+	AddressBook::AddressBook (): m_Storage (nullptr), m_IsLoaded (false), m_IsDownloading (false), 
 		m_DefaultSubscription (nullptr), m_SubscriptionsUpdateTimer (nullptr)
 	{
 	}
 
 	AddressBook::~AddressBook ()
 	{	
+		Stop ();
+	}
+
+	void AddressBook::Start ()
+	{
+		StartSubscriptions ();
+	}
+	
+	void AddressBook::Stop ()
+	{
+		StopSubscriptions ();
+		if (m_SubscriptionsUpdateTimer)
+		{	
+			delete m_SubscriptionsUpdateTimer;	
+			m_SubscriptionsUpdateTimer = nullptr;
+		}	
 		if (m_IsDownloading)
 		{
 			LogPrint (eLogInfo, "Subscription is downloading. Waiting for temination...");
@@ -171,18 +187,24 @@ namespace client
 				std::this_thread::sleep_for (std::chrono::seconds (1)); // wait for 1 seconds
 			}	
 			LogPrint (eLogError, "Subscription download hangs");
+			m_IsDownloading = false;
 		}	
 		if (m_Storage)
 		{
 			m_Storage->Save (m_Addresses);
 			delete m_Storage;
+			m_Storage = nullptr;
 		}
-		delete m_DefaultSubscription;
+		if (m_DefaultSubscription)
+		{	
+			delete m_DefaultSubscription;
+			m_DefaultSubscription = nullptr;
+		}	
 		for (auto it: m_Subscriptions)
 			delete it;
-		delete m_SubscriptionsUpdateTimer;		
-	}
-
+		m_Subscriptions.clear ();	
+	}	
+	
 	AddressBookStorage * AddressBook::CreateStorage ()
 	{
 		return new AddressBookFilesystemStorage ();

AddressBook.h

@@ -46,14 +46,14 @@ namespace client
 
 			AddressBook ();
 			~AddressBook ();
+			void Start ();
+			void Stop ();
 			bool GetIdentHash (const std::string& address, i2p::data::IdentHash& ident);
 			bool GetAddress (const std::string& address, i2p::data::IdentityEx& identity);
 			const i2p::data::IdentHash * FindAddress (const std::string& address);
 			void InsertAddress (const std::string& address, const std::string& base64); // for jump service
 			void InsertAddress (const i2p::data::IdentityEx& address);
 
-			void StartSubscriptions ();
-			void StopSubscriptions ();
 			void LoadHostsFromStream (std::istream& f);
 			void DownloadComplete (bool success);
 			//This method returns the ".b32.i2p" address
@@ -61,6 +61,9 @@ namespace client
 			std::string ToAddress(const i2p::data::IdentityEx& ident) { return ToAddress(ident.GetIdentHash ()); }
 		private:
 
+			void StartSubscriptions ();
+			void StopSubscriptions ();
+			
 			AddressBookStorage * CreateStorage ();	
 			void LoadHosts ();
 			void LoadSubscriptions ();

ClientContext.cpp

@@ -101,12 +101,11 @@ namespace client
 			m_I2PControlService->Start ();
 			LogPrint("I2PControl started");
 		}
-		m_AddressBook.StartSubscriptions ();
+		m_AddressBook.Start ();
 	}
 		
 	void ClientContext::Stop ()
 	{
-		m_AddressBook.StopSubscriptions ();	
 		m_HttpProxy->Stop();
 		delete m_HttpProxy;
 		m_HttpProxy = nullptr;
@@ -148,7 +147,7 @@ namespace client
 			m_I2PControlService = nullptr;
 			LogPrint("I2PControl stopped");	
 		}	
-
+		m_AddressBook.Stop ();		
 		for (auto it: m_Destinations)
 			it.second->Stop ();
 		m_Destinations.clear ();