3 years ago · aa81a70ef2
--- a/ConditionMonitoring/asioClientServer/net_client.h
+++ b/ConditionMonitoring/asioClientServer/net_client.h
 /*
 	MMO Client/Server Framework using ASIO
 	"Happy Birthday Mrs Javidx9!" - javidx9
 	Videos: 
 	Part #1: https://youtu.be/2hNdkYInj4g
 	Part #2: https://youtu.be/UbjxGvrDrbw
 	License (OLC-3)
 	~~~~~~~~~~~~~~~
 	Copyright 2018 - 2020 OneLoneCoder.com
 	Redistribution and use in source and binary forms, with or without
 	modification, are permitted provided that the following conditions
 	are met:
 	1. Redistributions or derivations of source code must retain the above
 	copyright notice, this list of conditions and the following disclaimer.
 	2. Redistributions or derivative works in binary form must reproduce
 	the above copyright notice. This list of conditions and the following
 	disclaimer must be reproduced in the documentation and/or other
 	materials provided with the distribution.
 	3. Neither the name of the copyright holder nor the names of its
 	contributors may be used to endorse or promote products derived
 	from this software without specific prior written permission.
 	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 	Links
 	~~~~~
 	YouTube:	https://www.youtube.com/javidx9
 	Discord:	https://discord.gg/WhwHUMV
 	Twitter:	https://www.twitter.com/javidx9
 	Twitch:		https://www.twitch.tv/javidx9
 	GitHub:		https://www.github.com/onelonecoder
 	Homepage:	https://www.onelonecoder.com
 	Author
 	~~~~~~
 	David Barr, aka javidx9, ©OneLoneCoder 2019, 2020
 */
 #pragma once
 #include "net_common.h"
 #include "net_connection.h"
 namespace net
 {
 	template <typename T>
 	class ClientInterface
 	{
 	public:
 		ClientInterface() 
 		{}
 		virtual ~ClientInterface()
 		{
 			// If the client is destroyed, always try and disconnect from server
 			Disconnect();
 		}
 	public:
 		// Connect to server with hostname/ip-address and port
 		bool Connect(const std::string& host, const uint16_t port)
 		{
 			try
 			{
 				// Resolve hostname/ip-address into tangiable physical address
 				asio::ip::tcp::resolver resolver(m_context);
 				asio::ip::tcp::resolver::results_type endpoints = resolver.resolve(host, std::to_string(port));
 				// Create connection
                m_connection = std::make_unique<Connection<T>>(Connection<T>::Owner::CLIENT, m_context, asio::ip::tcp::socket(m_context), m_qMessagesIn);
 				// Tell the connection object to connect to server
 				m_connection->ConnectToServer(endpoints);
 				// Start Context Thread
 				thrContext = std::thread([this]() { m_context.run(); });
 			}
 			catch (std::exception& e)
 			{
 				std::cerr << "Client Exception: " << e.what() << "\n";
 				return false;
 			}
 			return true;
 		}
 		// Disconnect from server
 		void Disconnect()
 		{
 			// If connection exists, and it's connected then...
 			if(IsConnected())
 			{
 				// ...disconnect from server gracefully
 				m_connection->Disconnect();
 			}
 			// Either way, we're also done with the asio context...				
 			m_context.stop();
 			// ...and its thread
 			if (thrContext.joinable())
 				thrContext.join();
 			// Destroy the connection object
 			m_connection.release();
 		}
 		// Check if client is actually connected to a server
 		bool IsConnected()
 		{
 			if (m_connection)
 				return m_connection->IsConnected();
 			else
 				return false;
 		}
 	public:
 		// Send message to server
 		void Send(const Message<T>& msg)
 		{
 			if (IsConnected())
 					m_connection->Send(msg);
 		}
 		// Retrieve queue of messages from server
        net::ts_dequeue<OwnedMessage<T>>& Incoming()
 		{ 
 			return m_qMessagesIn;
 		}
 	protected:
 		// asio context handles the data transfer...
 		asio::io_context m_context;
 		// ...but needs a thread of its own to execute its work commands
 		std::thread thrContext;
 		// The client has a single instance of a "connection" object, which handles data transfer
 		std::unique_ptr<Connection<T>> m_connection;
 	private:
 		// This is the thread safe queue of incoming messages from server
        net::ts_dequeue<OwnedMessage<T>> m_qMessagesIn;
 	};
 }
--- a/ConditionMonitoring/asioClientServer/net_common.h
+++ b/ConditionMonitoring/asioClientServer/net_common.h
 /*
 	MMO Client/Server Framework using ASIO
 	"Happy Birthday Mrs Javidx9!" - javidx9
 	Videos:
 	Part #1: https://youtu.be/2hNdkYInj4g
 	Part #2: https://youtu.be/UbjxGvrDrbw
 	License (OLC-3)
 	~~~~~~~~~~~~~~~
 	Copyright 2018 - 2020 OneLoneCoder.com
 	Redistribution and use in source and binary forms, with or without
 	modification, are permitted provided that the following conditions
 	are met:
 	1. Redistributions or derivations of source code must retain the above
 	copyright notice, this list of conditions and the following disclaimer.
 	2. Redistributions or derivative works in binary form must reproduce
 	the above copyright notice. This list of conditions and the following
 	disclaimer must be reproduced in the documentation and/or other
 	materials provided with the distribution.
 	3. Neither the name of the copyright holder nor the names of its
 	contributors may be used to endorse or promote products derived
 	from this software without specific prior written permission.
 	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 	Links
 	~~~~~
 	YouTube:	https://www.youtube.com/javidx9
 	Discord:	https://discord.gg/WhwHUMV
 	Twitter:	https://www.twitter.com/javidx9
 	Twitch:		https://www.twitch.tv/javidx9
 	GitHub:		https://www.github.com/onelonecoder
 	Homepage:	https://www.onelonecoder.com
 	Author
 	~~~~~~
 	David Barr, aka javidx9, ©OneLoneCoder 2019, 2020
 */
 #pragma once
 #include <memory>
 #include <thread>
 #include <mutex>
 #include <deque>
 #include <optional>
 #include <vector>
 #include <iostream>
 #include <algorithm>
 #include <chrono>
 #include <cstdint>
 #ifdef _WIN32
 #define _WIN32_WINNT 0x0A00
 #endif
 #define ASIO_STANDALONE
 #include <asio.hpp>
 #include <asio/ts/buffer.hpp>
 #include <asio/ts/internet.hpp>
--- a/ConditionMonitoring/asioClientServer/net_connection.h
+++ b/ConditionMonitoring/asioClientServer/net_connection.h
 /*
 	MMO Client/Server Framework using ASIO
 	"Happy Birthday Mrs Javidx9!" - javidx9
 	Videos:
 	Part #1: https://youtu.be/2hNdkYInj4g
 	Part #2: https://youtu.be/UbjxGvrDrbw
 	License (OLC-3)
 	~~~~~~~~~~~~~~~
 	Copyright 2018 - 2020 OneLoneCoder.com
 	Redistribution and use in source and binary forms, with or without
 	modification, are permitted provided that the following conditions
 	are met:
 	1. Redistributions or derivations of source code must retain the above
 	copyright notice, this list of conditions and the following disclaimer.
 	2. Redistributions or derivative works in binary form must reproduce
 	the above copyright notice. This list of conditions and the following
 	disclaimer must be reproduced in the documentation and/or other
 	materials provided with the distribution.
 	3. Neither the name of the copyright holder nor the names of its
 	contributors may be used to endorse or promote products derived
 	from this software without specific prior written permission.
 	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 	Links
 	~~~~~
 	YouTube:	https://www.youtube.com/javidx9
 	Discord:	https://discord.gg/WhwHUMV
 	Twitter:	https://www.twitter.com/javidx9
 	Twitch:		https://www.twitch.tv/javidx9
 	GitHub:		https://www.github.com/onelonecoder
 	Homepage:	https://www.onelonecoder.com
 	Author
 	~~~~~~
 	David Barr, aka javidx9, ©OneLoneCoder 2019, 2020
 */
 #pragma once
 #include "net_common.h"
 #include "net_dequeue_ts.h"
 #include "net_message.h"
 namespace net
 {
 	template<typename T>
 	class Connection : public std::enable_shared_from_this<Connection<T>>
 	{
 	public:
 		// A connection is "owned" by either a server or a client, and its
 		// behaviour is slightly different bewteen the two.
 		enum class Owner
 		{
 			SERVER,
 			CLIENT
 		};
 	public:
 		// Constructor: Specify Owner, connect to context, transfer the socket
 		//				Provide reference to incoming message queue
        Connection(Owner parent, asio::io_context& asioContext, asio::ip::tcp::socket socket, ts_dequeue<OwnedMessage<T>>& qIn)
            : m_socket(std::move(socket)), m_asioContext(asioContext), m_qMessagesIn(qIn)
 		{
 			m_nOwnerType = parent;
 		}
 		virtual ~Connection()
 		{}
 		// This ID is used system wide - its how clients will understand other clients
 		// exist across the whole system.
 		uint32_t GetID() const
 		{
 			return id;
 		}
 	public:
 		void ConnectToClient(uint32_t uid = 0)
 		{
 			if (m_nOwnerType == Owner::SERVER)
 			{
 				if (m_socket.is_open())
 				{
 					id = uid;
 					ReadHeader();
 				}
 			}
 		}
 		void ConnectToServer(const asio::ip::tcp::resolver::results_type& endpoints)
 		{
 			// Only clients can connect to servers
 			if (m_nOwnerType == Owner::CLIENT)
 			{
 				// Request asio attempts to connect to an endpoint
 				asio::async_connect(m_socket, endpoints,
 					[this](std::error_code ec, asio::ip::tcp::endpoint endpoint)
 					{
 						if (!ec)
 						{
 							ReadHeader();
 						}
 					});
 			}
 		}
 		void Disconnect()
 		{
 			if (IsConnected())
 				asio::post(m_asioContext, [this]() { m_socket.close(); });
 		}
 		bool IsConnected() const
 		{
 			return m_socket.is_open();
 		}
 		// Prime the connection to wait for incoming messages
 		void StartListening()
 		{
 		}
 	public:
 		// ASYNC - Send a message, connections are one-to-one so no need to specifiy
 		// the target, for a client, the target is the server and vice versa
 		void Send(const Message<T>& msg)
 		{
 			asio::post(m_asioContext,
 				[this, msg]()
 				{
 					// If the queue has a message in it, then we must 
 					// assume that it is in the process of asynchronously being written.
 					// Either way add the message to the queue to be output. If no messages
 					// were available to be written, then start the process of writing the
 					// message at the front of the queue.
 					bool bWritingMessage = !m_qMessagesOut.empty();
 					m_qMessagesOut.push_back(msg);
 					if (!bWritingMessage)
 					{
 						WriteHeader();
 					}
 				});
 		}
 	private:
 		// ASYNC - Prime context to write a message header
 		void WriteHeader()
 		{
 			// If this function is called, we know the outgoing message queue must have 
 			// at least one message to send. So allocate a transmission buffer to hold
 			// the message, and issue the work - asio, send these bytes
 			asio::async_write(m_socket, asio::buffer(&m_qMessagesOut.front().header, sizeof(MessageHeader<T>)),
 				[this](std::error_code ec, std::size_t length)
 				{
 					// asio has now sent the bytes - if there was a problem
 					// an error would be available...
 					if (!ec)
 					{
 						// ... no error, so check if the message header just sent also
 						// has a message body...
 						if (m_qMessagesOut.front().body.size() > 0)
 						{
 							// ...it does, so issue the task to write the body bytes
 							WriteBody();
 						}
 						else
 						{
 							// ...it didnt, so we are done with this message. Remove it from 
 							// the outgoing message queue
 							m_qMessagesOut.pop_front();
 							// If the queue is not empty, there are more messages to send, so
 							// make this happen by issuing the task to send the next header.
 							if (!m_qMessagesOut.empty())
 							{
 								WriteHeader();
 							}
 						}
 					}
 					else
 					{
 						// ...asio failed to write the message, we could analyse why but 
 						// for now simply assume the connection has died by closing the
 						// socket. When a future attempt to write to this client fails due
 						// to the closed socket, it will be tidied up.
 						std::cout << "[" << id << "] Write Header Fail.\n";
 						m_socket.close();
 					}
 				});
 		}
 		// ASYNC - Prime context to write a message body
 		void WriteBody()
 		{
 			// If this function is called, a header has just been sent, and that header
 			// indicated a body existed for this message. Fill a transmission buffer
 			// with the body data, and send it!
 			asio::async_write(m_socket, asio::buffer(m_qMessagesOut.front().body.data(), m_qMessagesOut.front().body.size()),
 				[this](std::error_code ec, std::size_t length)
 				{
 					if (!ec)
 					{
 						// Sending was successful, so we are done with the message
 						// and remove it from the queue
 						m_qMessagesOut.pop_front();
 						// If the queue still has messages in it, then issue the task to 
 						// send the next messages' header.
 						if (!m_qMessagesOut.empty())
 						{
 							WriteHeader();
 						}
 					}
 					else
 					{
 						// Sending failed, see WriteHeader() equivalent for description :P
 						std::cout << "[" << id << "] Write Body Fail.\n";
 						m_socket.close();
 					}
 				});
 		}
 		// ASYNC - Prime context ready to read a message header
 		void ReadHeader()
 		{
 			// asio to waits until it receives
 			// enough bytes to form a header of a message. We know the headers are a fixed
 			// size, so allocate a transmission buffer large enough to store it.
 			//Call this function to set up an asynchronous listener for a certain Connection
 			asio::async_read(m_socket, asio::buffer(&m_msgTemporaryIn.header, sizeof(MessageHeader<T>)),
 				[this](std::error_code ec, std::size_t length)
 				{						
 					if (!ec)
 					{
 						//Full header readed
 						//Check for message body
 						if (m_msgTemporaryIn.header.size > 0)
 						{
 							//Allocate storage
 							m_msgTemporaryIn.body.resize(m_msgTemporaryIn.header.size);
 							//Read if available
 							ReadBody();
 						}
 						else
 						{
 							//Bodyless message, add to queue
 							AddToIncomingMessageQueue();
 						}
 					}
 					else
 					{
 						//Failure, probably a disconnection
 						std::cout << "[" << id << "] Error: " << ec.message() << std::endl;
 						m_socket.close();
 					}
 				});
 		}
 		// ASYNC - Prime context to read a message body
 		void ReadBody()
 		{
 			//Called after header has been read successfully
 			//Read the body in the pre allocated storage
 			asio::async_read(m_socket, asio::buffer(m_msgTemporaryIn.body.data(), m_msgTemporaryIn.body.size()),
 				[this](std::error_code ec, std::size_t length)
 				{						
 					if (!ec)
 					{
 						// Complete message, add to queue
 						AddToIncomingMessageQueue();
 					}
 					else
 					{
 						//Failure, probably a disconnection
 						std::cout << "[" << id << "] Error reading body: " << ec.message() << std::endl;
 						m_socket.close();
 					}
 				});
 		}
 		// Add a complete message to the incoming queue,  with or without body
 		void AddToIncomingMessageQueue()
 		{				
 			//Put it in the queue, put a owner to the object to let the server know who send the message (which connection)
 			if(m_nOwnerType == Owner::SERVER)
 				m_qMessagesIn.push_back({ this->shared_from_this(), m_msgTemporaryIn });
 			else
 				m_qMessagesIn.push_back({ nullptr, m_msgTemporaryIn });
 			//Done queueing the message, now initialize a new async read to wait for next message
 			ReadHeader();
 		}
 	protected:
 		// unique socket to a remote 
 		asio::ip::tcp::socket m_socket;
 		// This context is shared with the whole asio instance
 		asio::io_context& m_asioContext;
 		// This queue holds all messages to be sent to the remote side
 		// of this connection
        ts_dequeue<Message<T>> m_qMessagesOut;
 		// This references the incoming queue of the parent object
        ts_dequeue<OwnedMessage<T>>& m_qMessagesIn;
 		// Incoming messages are constructed asynchronously, so we will
 		// store the part assembled message here, until it is ready
 		Message<T> m_msgTemporaryIn;
 		// The "owner" decides how some of the connection behaves
 		Owner m_nOwnerType = Owner::SERVER;
 		uint32_t id = 0;
 	};
 }
--- a/ConditionMonitoring/asioClientServer/net_dequeue_ts.h
+++ b/ConditionMonitoring/asioClientServer/net_dequeue_ts.h
 /*
 MMO Client/Server Framework using ASIO
 "Happy Birthday Mrs Javidx9!" - javidx9
 Videos:
 Part #1: https://youtu.be/2hNdkYInj4g
 Part #2: https://youtu.be/UbjxGvrDrbw
 License (OLC-3)
 ~~~~~~~~~~~~~~~
 Copyright 2018 - 2020 OneLoneCoder.com
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions or derivations of source code must retain the above
 copyright notice, this list of conditions and the following disclaimer.
 2. Redistributions or derivative works in binary form must reproduce
 the above copyright notice. This list of conditions and the following
 disclaimer must be reproduced in the documentation and/or other
 materials provided with the distribution.
 3. Neither the name of the copyright holder nor the names of its
 contributors may be used to endorse or promote products derived
 from this software without specific prior written permission.
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 Links
 ~~~~~
 YouTube:	https://www.youtube.com/javidx9
 Discord:	https://discord.gg/WhwHUMV
 Twitter:	https://www.twitter.com/javidx9
 Twitch:		https://www.twitch.tv/javidx9
 GitHub:		https://www.github.com/onelonecoder
 Homepage:	https://www.onelonecoder.com
 Author
 ~~~~~~
 David Barr, aka javidx9, ©OneLoneCoder 2019, 2020
 */
 #pragma once
 #include "net_common.h"
 namespace net
 {
 	template<typename T>
    class ts_dequeue
 	{
 	public:
        ts_dequeue() = default;
        ts_dequeue(const ts_dequeue<T>&) = delete;
        virtual ~ts_dequeue() { clear(); }
 	public:
 		// Returns and maintains item at front of Queue
 		const T& front()
 		{
 			std::scoped_lock lock(muxQueue);
 			return deqQueue.front();
 		}
 		// Returns and maintains item at back of Queue
 		const T& back()
 		{
 			std::scoped_lock lock(muxQueue);
 			return deqQueue.back();
 		}
 		// Removes and returns item from front of Queue
 		T pop_front()
 		{
 			std::scoped_lock lock(muxQueue);
 			auto t = std::move(deqQueue.front());
 			deqQueue.pop_front();
 			return t;
 		}
 		// Removes and returns item from back of Queue
 		T pop_back()
 		{
 			std::scoped_lock lock(muxQueue);
 			auto t = std::move(deqQueue.back());
 			deqQueue.pop_back();
 			return t;
 		}
 		// Adds an item to back of Queue
 		void push_back(const T& item)
 		{
 			std::scoped_lock lock(muxQueue);
 			deqQueue.emplace_back(std::move(item));
 			std::unique_lock<std::mutex> ul(muxBlocking);
 			cvBlocking.notify_one();
 		}
 		// Adds an item to front of Queue
 		void push_front(const T& item)
 		{
 			std::scoped_lock lock(muxQueue);
 			deqQueue.emplace_front(std::move(item));
 			std::unique_lock<std::mutex> ul(muxBlocking);
 			cvBlocking.notify_one();
 		}
 		// Returns true if Queue has no items
 		bool empty()
 		{
 			std::scoped_lock lock(muxQueue);
 			return deqQueue.empty();
 		}
 		// Returns number of items in Queue
 		size_t count()
 		{
 			std::scoped_lock lock(muxQueue);
 			return deqQueue.size();
 		}
 		// Clears Queue
 		void clear()
 		{
 			std::scoped_lock lock(muxQueue);
 			deqQueue.clear();
 		}
 		void wait()
 		{
 			while (empty())
 			{
 				std::unique_lock<std::mutex> ul(muxBlocking);
 				cvBlocking.wait(ul);
 			}
 		}
 	protected:
 		std::mutex muxQueue;
 		std::deque<T> deqQueue;
 		std::condition_variable cvBlocking;
 		std::mutex muxBlocking;
 	};
 }
--- a/ConditionMonitoring/asioClientServer/net_message.h
+++ b/ConditionMonitoring/asioClientServer/net_message.h
 /*
 	MMO Client/Server Framework using ASIO
 	"Happy Birthday Mrs Javidx9!" - javidx9
 	Videos:
 	Part #1: https://youtu.be/2hNdkYInj4g
 	Part #2: https://youtu.be/UbjxGvrDrbw
 	License (OLC-3)
 	~~~~~~~~~~~~~~~
 	Copyright 2018 - 2020 OneLoneCoder.com
 	Redistribution and use in source and binary forms, with or without
 	modification, are permitted provided that the following conditions
 	are met:
 	1. Redistributions or derivations of source code must retain the above
 	copyright notice, this list of conditions and the following disclaimer.
 	2. Redistributions or derivative works in binary form must reproduce
 	the above copyright notice. This list of conditions and the following
 	disclaimer must be reproduced in the documentation and/or other
 	materials provided with the distribution.
 	3. Neither the name of the copyright holder nor the names of its
 	contributors may be used to endorse or promote products derived
 	from this software without specific prior written permission.
 	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 	HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 	Links
 	~~~~~
 	YouTube:	https://www.youtube.com/javidx9
 	Discord:	https://discord.gg/WhwHUMV
 	Twitter:	https://www.twitter.com/javidx9
 	Twitch:		https://www.twitch.tv/javidx9
 	GitHub:		https://www.github.com/onelonecoder
 	Homepage:	https://www.onelonecoder.com
 	Author
 	~~~~~~
 	David Barr, aka javidx9, �OneLoneCoder 2019, 2020
 */
 #pragma once
 #include "net_common.h"
 #include <string>
 namespace net
 {
 	///[OLC_HEADERIFYIER] START "MESSAGE"
 	// Message Header is sent at start of all messages. The template allows us
 	// to use "enum class" to ensure that the messages are valid at compile time
 	template <typename T>
 	struct MessageHeader
 	{
 		T id{};
 		uint32_t size = 0;
 	};
 	// Message Body contains a header and a std::vector, containing raw bytes
 	// of infomation. This way the message can be variable length, but the size
 	// in the header must be updated.
 	template <typename T>
 	struct Message
 	{
 		// Header & Body vector
 		MessageHeader<T> header{};
 		std::vector<uint8_t> body;
 		// returns size of entire message packet in bytes
 		size_t size() const
 		{
 			return body.size();
 		}
 		// Override for std::cout compatibility - produces friendly description of message
 		friend std::ostream& operator << (std::ostream& os, const Message<T>& msg)
 		{
 			os << "ID:" << int(msg.header.id) << " Size:" << msg.header.size;
 			return os;
 		}
 		// Convenience Operator overloads - These allow us to add and remove stuff from
 		// the body vector as if it were a stack, so First in, Last Out. These are a 
 		// template in itself, because we dont know what data type the user is pushing or 
 		// popping, so lets allow them all. NOTE: It assumes the data type is fundamentally
 		// Plain Old Data (POD). TLDR: Serialise & Deserialise into/from a vector
 		// Pushes any POD-like data into the message buffer
 		template<typename DataType>
 		friend Message<T>& operator << (Message<T>& msg, const DataType& data)
 		{
 			// Check that the type of the data being pushed is trivially copyable
 			static_assert(std::is_standard_layout<DataType>::value, "Data is too complex to be pushed into vector");
 			// Cache current size of vector, as this will be the point we insert the data
 			size_t i = msg.body.size();
 			// Resize the vector by the size of the data being pushed
 			msg.body.resize(i + sizeof(DataType));
 			// Physically copy the data into the newly allocated vector space
 			std::memcpy(msg.body.data() + i, &data, sizeof(DataType));
 			// Recalculate the message size
 			msg.header.size = msg.size();
 			// Return the target message so it can be "chained"
 			return msg;
 		}
 		//Specified template to write string
 		friend Message<T>& operator << (Message<T>& msg, const std::string& data)
 		{
 			// Cache current size of vector, as this will be the point we insert the data
 			size_t i = msg.body.size();
 			// Resize the vector by the size of the data being pushed
 			//msg.body.resize(i + sizeof(data));
 			// Physically copy the data of the string character by character
 			msg.body.resize(i + data.size());
 			for (size_t index = 0; index < data.size(); index++) {
 				msg.body[i+index] = data.at(index);
 				//std::memcpy(msg.body.data() + i, &c, sizeof(uint8_t));
 			}
 			// Recalculate the message size
 			msg.header.size = (uint32_t)msg.size();
 			// Return the target message so it can be "chained"
 			return msg;
 		}
 		// Pulls any POD-like data form the message buffer
 		template<typename DataType>
 		friend Message<T>& operator >> (Message<T>& msg, DataType& data)
 		{
 			// Check that the type of the data being pushed is trivially copyable
 			static_assert(std::is_standard_layout<DataType>::value, "Data is too complex to be pulled from vector");
 			// Cache the location towards the end of the vector where the pulled data starts
 			size_t i = msg.body.size() - sizeof(DataType);
 			// Physically copy the data from the vector into the user variable
 			std::memcpy(&data, msg.body.data() + i, sizeof(DataType));
 			// Shrink the vector to remove read bytes, and reset end position
 			msg.body.resize(i);
 			// Recalculate the message size
 			msg.header.size = msg.size();
 			// Return the target message so it can be "chained"
 			return msg;
 		}
 		//Specified template to read string
 		friend Message<T>& operator >> (Message<T>& msg, std::string& data)
 		{
 			// Cache the location towards the end of the vector where the pulled data starts
 			size_t i = 0;
 			// Physically copy the data from the vector into the user variable
 			std::memcpy(&data, msg.body.data(), msg.body.size());
 			// Shrink the vector to remove read bytes, and reset end position
 			msg.body.resize(i);
 			// Return the target message so it can be "chained"
 			return msg;
 		}
 	};
 	// An "owned" message is identical to a regular message, but it is associated with
 	// a connection. On a server, the owner would be the client that sent the message, 
 	// on a client the owner would be the server.
 	// Forward declare the connection
 	template <typename T>
 	class Connection;
 	template <typename T>
 	struct OwnedMessage
 	{
 		std::shared_ptr<Connection<T>> remote = nullptr;
 		Message<T> msg;
 		// Again, a friendly string maker
 		friend std::ostream& operator<<(std::ostream& os, const OwnedMessage<T>& msg)
 		{
 			os << msg.msg;
 			return os;
 		}
 	};		
 }
--- a/ConditionMonitoring/asioClientServer/net_server.h
+++ b/ConditionMonitoring/asioClientServer/net_server.h
 /*
    MMO Client/Server Framework using ASIO
    "Happy Birthday Mrs Javidx9!" - javidx9
    Videos:
    Part #1: https://youtu.be/2hNdkYInj4g
    Part #2: https://youtu.be/UbjxGvrDrbw
    License (OLC-3)
    ~~~~~~~~~~~~~~~
    Copyright 2018 - 2020 OneLoneCoder.com
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions or derivations of source code must retain the above
    copyright notice, this list of conditions and the following disclaimer.
    2. Redistributions or derivative works in binary form must reproduce
    the above copyright notice. This list of conditions and the following
    disclaimer must be reproduced in the documentation and/or other
    materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    Links
    ~~~~~
    YouTube:	https://www.youtube.com/javidx9
    Discord:	https://discord.gg/WhwHUMV
    Twitter:	https://www.twitter.com/javidx9
    Twitch:		https://www.twitch.tv/javidx9
    GitHub:		https://www.github.com/onelonecoder
    Homepage:	https://www.onelonecoder.com
    Author
    ~~~~~~
    David Barr, aka javidx9, ?OneLoneCoder 2019, 2020
 */
 #pragma once
 #include "net_dequeue_ts.h"
 #include "net_common.h"
 #include "net_message.h"
 #include "net_connection.h"
 #include "easylogging++.h"
 namespace net
 {
    template<typename T>
    class ServerInterface
    {
    public:        // Create a server, ready to listen on specified port
        ServerInterface(uint16_t port)
            : m_asioAcceptor(m_asioContext, asio::ip::tcp::endpoint(asio::ip::tcp::v4(), port))  { }
        virtual ~ServerInterface() { Stop(); }
        // Starts the server
        virtual bool Start()
        {
            try
            {
                // Issue a task to the asio context - This is important
                // as it will prime the context with "work", and stop it
                // from exiting immediately. Since this is a server, we
                // want it primed ready to handle clients trying to
                // connect.
                WaitForClientConnection();
                // Launch the asio context in its own thread
                m_threadContext = std::thread([this]() { m_asioContext.run(); });
            }
            catch (std::exception& e)
            {
                // Something prohibited the server from listening
                LOG(ERROR) << "[SERVER] Exception: " << e.what();
                return false;
            }
            return true;
        }
        bool isStopped()const {
            return m_asioContext.stopped();
        }
        // Stops the server!
        virtual void Stop()
        {
            // Request the context to close
            m_asioContext.stop();
            // Tidy up the context thread
            if (m_threadContext.joinable()) m_threadContext.join();
            // Inform someone, anybody, if they care...
            LOG(INFO) << "[SERVER] Stopped!\n";
        }
        // ASYNC - Instruct asio to wait for connection
        void WaitForClientConnection()
        {
            // Prime context with an instruction to wait until a socket connects. This
            // is the purpose of an "acceptor" object. It will provide a unique socket
            // for each incoming connection attempt
            m_asioAcceptor.async_accept(
                [this](std::error_code ec, asio::ip::tcp::socket socket)
                {
                    // Triggered by incoming connection request
                    if (!ec)
                    {
                        LOG(INFO) << "[SERVER] New Connection: " << socket.remote_endpoint();
                        // Create a new connection to handle this client
                        std::shared_ptr<Connection<T>> newconn =
                            std::make_shared<Connection<T>>(Connection<T>::Owner::SERVER,
                                m_asioContext, std::move(socket), m_qMessagesIn);
                        // Give the user server a chance to deny connection
                        if (OnClientConnect(newconn))
                        {
                            // Connection allowed, so add to container of new connections
                            m_deqConnections.push_back(std::move(newconn));
                            // Issue a task to the connection's
                            // asio context to sit and wait for bytes to arrive!
                            m_deqConnections.back()->ConnectToClient(nIDCounter++);
                            LOG(INFO) << "[" << m_deqConnections.back()->GetID() << "] Connection Approved";
                        }
                        else
                        {
                            LOG(INFO) << "[SERVER] Connection Denied";
                            // Connection will go out of scope with no pending tasks, so will
                            // get destroyed automatically (smart pointer)
                        }
                    }
                    else
                    {
                        // Error has occurred during acceptance
                        LOG(INFO) << "[SERVER] New Connection Error: " << ec.message();
                    }
                    // Prime the asio context with more work - again simply wait for
                    // another connection...
                    WaitForClientConnection();
                });
        }
        // Send a message to a specific client
        void MessageClient(std::shared_ptr<Connection<T>> client, const Message<T>& msg)
        {
            // Check client is legitimate...
            if (client && client->IsConnected())
            {
                // ...and post the message via the connection
                client->Send(msg);
            }
            else
            {
                // If we cant communicate with client then we may as
                // well remove the client - let the server know, it may
                // be tracking it somehow
                OnClientDisconnect(client);
                // Off you go now, bye bye!
                client.reset();
                // Then physically remove it from the container
                m_deqConnections.erase(
                    std::remove(m_deqConnections.begin(), m_deqConnections.end(), client), m_deqConnections.end());
            }
        }
        // Send message to all clients
        void MessageAllClients(const Message<T>& msg, std::shared_ptr<Connection<T>> pIgnoreClient = nullptr)
        {
            bool bInvalidClientExists = false;
            // Iterate through all clients in container
            for (auto& client : m_deqConnections)
            {
                // Check client is connected...
                if (client && client->IsConnected())
                {
                    // ..it is!
                    if(client != pIgnoreClient)
                        client->Send(msg);
                }
                else
                {
                    // The client couldnt be contacted, so assume it has
                    // disconnected.
                    OnClientDisconnect(client);
                    client.reset();
                    // Set this flag to then remove dead clients from container
                    bInvalidClientExists = true;
                }
            }
            // Remove dead clients, all in one go - this way, we dont invalidate the
            // container as we iterated through it.
            if (bInvalidClientExists)
                m_deqConnections.erase(
                    std::remove(m_deqConnections.begin(), m_deqConnections.end(), nullptr), m_deqConnections.end());
        }
        // Force server to respond to incoming messages
        //	size_t nmaxMessages: Assign -1 to unsigned to unspecify max message count
        //	bool bWait: if queue is empty, wait synchronously until message arrives
        void Update(size_t nMaxMessages = -1, bool bWait = false)
        {
            if (bWait) m_qMessagesIn.wait();
            // Process as many messages as you can up to the value
            // specified
            size_t nMessageCount = 0;
            while (nMessageCount < nMaxMessages && !m_qMessagesIn.empty())
            {
                // Grab the front message
                auto msg = m_qMessagesIn.pop_front();
                // Pass to message handler
                OnMessage(msg.remote, msg.msg);
                nMessageCount++;
            }
        }
    protected:
        //Overwritable functions to customize server behaviour
        // Called when a client connects, you can veto the connection by returning false
        virtual bool OnClientConnect(std::shared_ptr<Connection<T>> client) = 0;
        // Called when a client appears to have disconnected
        virtual void OnClientDisconnect(std::shared_ptr<Connection<T>> client) = 0;
        // Called when a message arrives
        virtual void OnMessage(std::shared_ptr<Connection<T>> client, Message<T>& msg) = 0;
        // Thread Safe Queue for incoming message packets
        ts_dequeue<OwnedMessage<T>> m_qMessagesIn;
        // Container of active validated connections
        std::deque<std::shared_ptr<Connection<T>>> m_deqConnections;
        // Order of declaration is important - it is also the order of initialisation
        asio::io_context m_asioContext;
        std::thread m_threadContext;
        // These things need an asio context
        asio::ip::tcp::acceptor m_asioAcceptor; // Handles new incoming connection attempts...
        // Clients will be identified in the "wider system" via an ID
        uint32_t nIDCounter = 10000;
    };
 }