Macos2async

CMakeLists.txt

@@ -54,7 +54,7 @@ if( INCLUDE_PYTHON )
   set( MACOS_USE_PYTHON_MODULE_DESC "Specifies which Python module to build Malmo on Apple MacOS" )
   set( USE_PYTHON_VERSIONS 3.6 CACHE STRING ${USE_PYTHON_VERSIONS_DESC} )
   # Boost has switched to using a 2 digit naming convention for python on MacOS.
-  set( MACOS_USE_PYTHON_MODULE "python36" CACHE STRING ${MACOS_USE_PYTHON_MODULE_DESC} )
+  set( MACOS_USE_PYTHON_MODULE "python37" CACHE STRING ${MACOS_USE_PYTHON_MODULE_DESC} )
 endif()
 
 set( WARNINGS_AS_ERRORS OFF )

Malmo/src/AgentHost.cpp

@@ -65,7 +65,7 @@ namespace malmo
 
         // start the io_service on background threads
         this->work = boost::in_place(boost::ref(this->io_service));
-        const int NUM_BACKGROUND_THREADS = 1; // can be increased if I/O becomes a bottleneck
+        const int NUM_BACKGROUND_THREADS = 3; // can be increased if I/O becomes a bottleneck
         for( int i = 0; i < NUM_BACKGROUND_THREADS; i++ )
             this->background_threads.push_back( boost::make_shared<boost::thread>( boost::bind( &boost::asio::io_service::run, &this->io_service ) ) );
     }
@@ -113,7 +113,7 @@ namespace malmo
         std::string line = "";
         std::string version = "";
         // Keep concatenating lines until we have a match, or we run out of schema.
-        while (version.empty() && getline(stream, line))
+        while (version.empty() && !stream.eof() && getline(stream, line))
         {
             boost::trim(line);
             xml += line;
@@ -314,9 +314,10 @@ namespace malmo
             {
                 reply = rpc.sendStringAndGetShortReply(this->io_service, item->ip_address, item->control_port, request, false);
             }
-            catch (std::exception&)
+            catch (std::exception& e)
             {
                 // This is expected quite often - client is likely not running.
+                LOGINFO(LT("Client could not be contacted: "), item->ip_address, LT(":"), item->control_port, LT(" "), e.what());
                 continue;
             }
             LOGINFO(LT("Reserving client, received reply from "), item->ip_address, LT(": "), reply);
@@ -452,7 +453,8 @@ namespace malmo
     {
         boost::lock_guard<boost::mutex> scope_guard(this->world_state_mutex);
 
-        return this->world_state;
+        WorldState current_world_state(this->world_state); // Copy while holding lock.
+        return current_world_state;
     }
 
     WorldState AgentHost::getWorldState()
@@ -498,8 +500,13 @@ namespace malmo
         {
             return; // can re-use existing server
         }
+
+        if (this->mission_control_server != 0) {
+            this->mission_control_server->close();
+        }
+
         this->mission_control_server = boost::make_shared<StringServer>(this->io_service, port, boost::bind(&AgentHost::onMissionControlMessage, this, _1), "mcp");
-        this->mission_control_server->start();
+        this->mission_control_server->start(mission_control_server);
     }
 
     boost::shared_ptr<VideoServer> AgentHost::listenForVideo(boost::shared_ptr<VideoServer> video_server, int port, short width, short height, short channels, TimestampedVideoFrame::FrameType frametype)
@@ -530,6 +537,10 @@ namespace malmo
             video_server->getChannels() != channels ||
             video_server->getFrameType() != frametype)
         {
+            if (video_server != 0) {
+                video_server->close();
+            }
+
             // Can't use the server passed in - create a new one.
             ret_server = boost::make_shared<VideoServer>( this->io_service, port, width, height, channels, frametype, boost::bind(&AgentHost::onVideo, this, _1));
 
@@ -540,8 +551,8 @@ namespace malmo
                 ret_server->recordBmps(this->current_mission_record->getTemporaryDirectory());
             }
 
-            ret_server->start();
-        } 
+            ret_server->start(ret_server);
+        }
         else {
             // re-use the existing video_server
             // but now we need to re-create the file writers with the new file names
@@ -562,8 +573,12 @@ namespace malmo
     {
         if( !this->rewards_server || ( port != 0 && this->rewards_server->getPort() != port ) )
         {
+            if (rewards_server != nullptr) {
+                rewards_server->close();
+            }
+
             this->rewards_server = boost::make_shared<StringServer>(this->io_service, port, boost::bind(&AgentHost::onReward, this, _1), "rew");
-            this->rewards_server->start();
+            this->rewards_server->start(rewards_server);
         }
 
         if (this->current_mission_record->isRecordingRewards()){
@@ -575,8 +590,12 @@ namespace malmo
     {
         if( !this->observations_server || ( port != 0 && this->observations_server->getPort() != port ) ) 
         {
+            if (observations_server != nullptr) {
+                observations_server->close();
+            }
+
             this->observations_server = boost::make_shared<StringServer>(this->io_service, port, boost::bind(&AgentHost::onObservation, this, _1), "obs");
-            this->observations_server->start();
+            this->observations_server->start(observations_server);
         }
 
         if (this->current_mission_record->isRecordingObservations()){

Malmo/src/ClientConnection.cpp

@@ -148,7 +148,8 @@ namespace malmo
             if (ec)
                 LOGERROR(LT("Error resolving remote endpoint: "), ec.message());
             boost::lock_guard<boost::mutex> scope_guard(this->outbox_mutex);
-            this->outbox.pop_front();
+            if (!this->outbox.empty())
+                this->outbox.pop_front();
         }
         if (!this->outbox.empty())
             this->write();

Malmo/src/StringServer.cpp

@@ -24,16 +24,27 @@
 #include <boost/bind.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 
+#include <iostream>
+
 namespace malmo {
     StringServer::StringServer(boost::asio::io_service& io_service, int port, const boost::function<void(const TimestampedString string_message)> handle_string, const std::string& log_name)
         : handle_string(handle_string)
         , server(io_service, port, boost::bind(&StringServer::handleMessage, this, _1), log_name)
     {
     }
 
-    void StringServer::start()
+    void StringServer::start(boost::shared_ptr<StringServer>& scope)
     {
-        this->server.start();
+        this->scope = scope;
+        this->server.start(scope.get());
+    }
+
+    void StringServer::close() {
+        this->server.close();
+    }
+
+    void StringServer::release() {
+        this->scope = 0;
     }
 
     StringServer& StringServer::record(std::string path)

Malmo/src/StringServer.h

@@ -27,6 +27,7 @@
 // Boost:
 #include <boost/function.hpp>
 #include <boost/thread.hpp>
+#include <boost/shared_ptr.hpp>
 
 // STL:
 #include <fstream>
@@ -36,7 +37,7 @@
 namespace malmo
 {
     //! A TCP server that receives strings and can optionally persist to file.
-    class StringServer
+    class StringServer : ServerScope
     {
         public:
 
@@ -57,7 +58,12 @@ namespace malmo
             void recordMessage(const TimestampedString message);
 
             //! Starts the string server.
-            void start();
+
+            void start(boost::shared_ptr<StringServer>& scope);
+
+            virtual void release();
+
+            void close();
 
         private:
 
@@ -67,6 +73,8 @@ namespace malmo
             TCPServer server;
             std::ofstream writer;
             boost::mutex write_mutex;
+
+            boost::shared_ptr<StringServer> scope = nullptr;
     };
 }
 

Malmo/src/TCPConnection.cpp

@@ -141,32 +141,59 @@ namespace malmo
         else
             LOGERROR(LT("TCPConnection("), this->log_name, LT(")::handle_read_line("), safe_local_endpoint(), LT("/"), safe_remote_endpoint(), LT(") - bytes_transferred: "), bytes_transferred, LT(" - ERROR: "), error.message());
     }
-    
+
     void TCPConnection::processMessage()
     {
         LOGFINE(LT("TCPConnection("), this->log_name, LT(")::processMessage("), safe_local_endpoint(), LT("/"), safe_remote_endpoint(), LT(") - bytes received: "), this->body_buffer.size());
 
-        if( this->confirm_with_fixed_reply )
-            sendReply();
-        this->onMessageReceived( TimestampedUnsignedCharVector( boost::posix_time::microsec_clock::universal_time(), 
-                                                                this->body_buffer ) );
-        this->read();
+        if (this->confirm_with_fixed_reply)
+        {
+            reply();
+        }
+        else
+        {
+            deliverMessage();
+        }
     }
 
-    void TCPConnection::sendReply() 
+    void TCPConnection::reply()
     {
         const int REPLY_SIZE_HEADER_LENGTH = 4;
-        boost::system::error_code ec;
-        u_long reply_size_header = htonl((u_long)this->fixed_reply.size());
-        size_t bytes_written = boost::asio::write(this->socket, boost::asio::buffer(&reply_size_header, REPLY_SIZE_HEADER_LENGTH), ec);
-        if (bytes_written != REPLY_SIZE_HEADER_LENGTH || ec)
-            LOGERROR(LT("TCPConnection("), this->log_name, LT(")::sendReply - ONLY SENT "), bytes_written, LT(" BYTES: "), ec.message());
-
-        bytes_written = boost::asio::write( this->socket, boost::asio::buffer(this->fixed_reply), boost::asio::transfer_all(), ec );
-        if (ec)
-            LOGERROR(LT("TCPConnection("), this->log_name, LT(")::sendReply - failed to send body of message: "), ec.message());
+        this->reply_size_header = htonl((u_long)this->fixed_reply.size());
+
+        // Send header and continue after with response body.
+        boost::asio::async_write(this->socket, boost::asio::buffer(&this->reply_size_header, REPLY_SIZE_HEADER_LENGTH), boost::bind(&TCPConnection::transferredHeader, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
+    }
+
+    void TCPConnection::transferredHeader(const boost::system::error_code& error, std::size_t bytes_transferred) {
+        if (!error)
+        {
+            // Send body and continue after with message delivery.
+            boost::asio::async_write(this->socket, boost::asio::buffer(this->fixed_reply), boost::bind(&TCPConnection::transferredBody, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
+        }
         else
-            LOGFINE(LT("TCPConnection("), this->log_name, LT(")::sendReply sent "), bytes_written, LT(" bytes"));
+        {
+            LOGERROR(LT("TCPConnection("), this->log_name, LT(")::transferredHeader - failed to send header of message: "), error.message());
+        }
+    }
+
+    void TCPConnection::transferredBody(const boost::system::error_code& error, std::size_t bytes_transferred) {
+        if (!error)
+        {
+            LOGFINE(LT("TCPConnection("), this->log_name, LT(")::transferredBody sent "), bytes_transferred, LT(" bytes"));
+
+            this->deliverMessage();
+        }
+        else
+        {
+            LOGERROR(LT("TCPConnection("), this->log_name, LT(")::transferredBody - failed to send body of message: "), error.message());
+        }
+    }
+
+    void TCPConnection::deliverMessage()
+    {
+        this->onMessageReceived(TimestampedUnsignedCharVector(boost::posix_time::microsec_clock::universal_time(), this->body_buffer));
+        this->read(); // Continue on with reading of next request message.
     }
 
     TCPConnection::TCPConnection(boost::asio::io_service& io_service, boost::function<void(const TimestampedUnsignedCharVector) > callback, bool expect_size_header, const std::string& log_name)

Malmo/src/TCPConnection.h

@@ -64,8 +64,13 @@ namespace malmo
             void handle_read_line( const boost::system::error_code& error, size_t bytes_transferred );
 
             size_t getSizeFromHeader();
+
             void processMessage();
-            void sendReply();
+            void reply();
+            void deliverMessage();
+
+            void transferredHeader(const boost::system::error_code& ec, std::size_t transferred);
+            void transferredBody(const boost::system::error_code& ec, std::size_t transferred);
 
         private:
 
@@ -84,6 +89,7 @@ namespace malmo
             std::string fixed_reply;
             bool expect_size_header;
             std::string log_name;
+            u_long reply_size_header;
     };
 }
 

Malmo/src/TCPServer.cpp

@@ -54,11 +54,17 @@ namespace malmo
         }
     }
 
-    void TCPServer::start()
+    void TCPServer::start(ServerScope* scope)
     {
+        this->scope = scope;
         this->startAccept();
     }
-
+
+    void TCPServer::close() {
+        this->closing = true;
+        this->acceptor->close();
+    }
+
     void TCPServer::confirmWithFixedReply(std::string reply)
     {
         this->confirm_with_fixed_reply = true;
@@ -72,9 +78,14 @@ namespace malmo
 
     void TCPServer::startAccept()
     {
+        boost::function<void(const TimestampedUnsignedCharVector) > deliverMsgIfNotClosed = [this](const TimestampedUnsignedCharVector msg) {
+            if (!this->closing)
+                this->onMessageReceived(msg);
+        };
+
         boost::shared_ptr<TCPConnection> new_connection = TCPConnection::create(
             this->acceptor->get_io_service(),
-            this->onMessageReceived,
+            deliverMsgIfNotClosed,
             this->expect_size_header,
             this->log_name
         );
@@ -89,17 +100,40 @@ namespace malmo
             boost::asio::placeholders::error));
     }
 
-    void TCPServer::handleAccept( 
+    void TCPServer::handleAccept(
         boost::shared_ptr<TCPConnection> new_connection,
         const boost::system::error_code& error)
     {
+        // On closing or on error release scope of async io processing which can be us. 
+
         if (!error)
         {
-            new_connection->read();
-            this->startAccept();
+            if (this->closing)
+            {
+                new_connection.get()->getSocket().close();
+                if (this->scope != nullptr) 
+                    this->scope->release();
+            }
+            else {
+                new_connection->read();
+                if (!this->closing)
+                {
+                    this->startAccept();
+                }
+                else
+                {
+                    if (this->scope != nullptr)
+                        this->scope->release();
+                }
+            }
         }
         else
+        {
             LOGERROR(LT("TCPServer::handleAccept("), this->log_name, LT(") - "), error.message());
+            if (this->scope != nullptr) {
+                this->scope->release(); 
+            }
+        }
     }
 
     int TCPServer::getPort() const