mirror of
https://github.com/besterprotocol/besterd
synced 2023-12-13 21:00:32 +01:00
640 lines
16 KiB
D
640 lines
16 KiB
D
module server.types;
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import utils.debugging : debugPrint;
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import std.conv : to;
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import std.socket : Socket, AddressFamily, SocketType, ProtocolType, parseAddress, SocketFlags;
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import core.thread : Thread;
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import std.stdio : writeln, File;
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import std.json : JSONValue, parseJSON, JSONException, JSONType, toJSON;
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import std.string : cmp;
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import server.handler;
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public class BesterServer
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{
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/**
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* Message handlers
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*
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* Associative array of `payloadType (string)`:`MessageHandler`
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* TODO: Implement this
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*/
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private MessageHandler[] handlers;
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/* The server's socket */
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private Socket serverSocket;
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this(JSONValue config)
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{
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/* TODO: Bounds check and JSON type check */
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debugPrint("Setting up socket...");
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setupServerSocket(config["network"]);
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/* TODO: Bounds check and JSON type check */
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debugPrint("Setting up message handlers...");
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setupHandlers(config["handlers"]);
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}
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private void setupHandlers(JSONValue handlerBlock)
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{
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/* TODO: Implement me */
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debugPrint("Constructing message handlers...");
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handlers = MessageHandler.constructHandlers(handlerBlock);
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writeln(handlers[0].getPluginName());
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}
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/* Setup the server socket */
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private void setupServerSocket(JSONValue networkBlock)
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{
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string bindAddress;
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ushort listenPort;
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JSONValue jsonAddress, jsonPort;
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writeln(networkBlock);
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/* TODO: Bounds check */
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jsonAddress = networkBlock["address"];
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jsonPort = networkBlock["port"];
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bindAddress = jsonAddress.str;
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listenPort = cast(ushort)jsonPort.integer;
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debugPrint("Binding to address: " ~ bindAddress ~ " and port " ~ to!(string)(listenPort));
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/* Create a socket */
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serverSocket = new Socket(AddressFamily.INET, SocketType.STREAM, ProtocolType.TCP);
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serverSocket.bind(parseAddress(bindAddress, listenPort));
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}
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/* Start listen loop */
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public void run()
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{
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serverSocket.listen(1); /* TODO: This value */
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debugPrint("Server listen loop started");
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while(true)
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{
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/* Wait for an incoming connection */
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Socket clientConnection = serverSocket.accept();
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/* Create a new client connection handler and start its thread */
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BesterConnection besterConnection = new BesterConnection(clientConnection, this);
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besterConnection.start();
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}
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}
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/* Authenticate the user */
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public bool authenticate(string username, string password)
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{
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/* TODO: Implement me */
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debugPrint("Attempting to authenticate:\n\nUsername: " ~ username ~ "\nPassword: " ~ password);
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return true;
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}
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}
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private class BesterConnection : Thread
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{
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/* The socket to the client */
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private Socket clientConnection;
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/* The server backend */
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private BesterServer server;
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this(Socket clientConnection, BesterServer server)
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{
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/* Save socket and set thread worker function pointer */
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super(&run);
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this.clientConnection = clientConnection;
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this.server = server;
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debugPrint("New client handler spawned for " ~ clientConnection.remoteAddress().toAddrString());
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}
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/* Read/send loop */
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private void run()
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{
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/* Receive buffer */
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byte[] buffer;
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while(true)
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{
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/* Byte counter for loop-consumer */
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uint currentByte = 0;
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/* Bytes received counter */
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long bytesReceived;
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/* TODO: Add fix here to loop for bytes */
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while(currentByte < 4)
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{
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/* Size buffer */
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byte[4] tempBuffer;
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/* Read at most 4 bytes */
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bytesReceived = clientConnection.receive(tempBuffer);
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if(!(bytesReceived > 0))
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{
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/* TODO: Handle error here */
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debugPrint("Error with receiving");
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return;
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}
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else
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{
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/**
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* Read the bytes from the temp buffer (as many as was received)
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* and append them to the *real* buffer.
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*/
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buffer ~= tempBuffer[0..bytesReceived];
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/* Increment the byte counter */
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currentByte += bytesReceived;
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}
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}
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/* Get the message length */
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int messageLength = *(cast(int*)buffer.ptr);
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writeln("Message length: ", cast(uint)messageLength);
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/* TODO: Testing locally ain't good as stuff arrives way too fast, although not as fast as I can type */
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/* What must happen is a loop to loop and wait for data */
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/* Full message buffer */
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byte[] messageBuffer;
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/* TODO: Add timeout if we haven't received a message in a certain amount of time */
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/* Reset the current byte counter */
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currentByte = 0;
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while(currentByte < messageLength)
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{
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/**
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* Receive 20 bytes (at most) at a time and don't dequeue from
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* the kernel's TCP stack's buffer.
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*/
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byte[20] messageBufferPartial;
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bytesReceived = clientConnection.receive(messageBufferPartial, SocketFlags.PEEK);
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/* Check for receive error */
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if(!(bytesReceived > 0))
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{
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debugPrint("Error receiving");
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return;
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}
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else
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{
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/* TODO: Make sure we only take [0, messageLength) bytes */
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if(cast(uint)bytesReceived+currentByte > messageLength)
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{
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byte[] remainingBytes;
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remainingBytes.length = messageLength-currentByte;
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clientConnection.receive(remainingBytes);
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/* Increment counter of received bytes */
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currentByte += remainingBytes.length;
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/* Append the received bytes to the FULL message buffer */
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messageBuffer ~= remainingBytes;
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writeln("Received ", currentByte, "/", cast(uint)messageLength, " bytes");
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}
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else
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{
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/* Increment counter of received bytes */
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currentByte += bytesReceived;
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/* Append the received bytes to the FULL message buffer */
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messageBuffer ~= messageBufferPartial[0..bytesReceived];
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/* TODO: Bug when over send, we must not allow this */
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writeln("Received ", currentByte, "/", cast(uint)messageLength, " bytes");
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clientConnection.receive(messageBufferPartial);
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}
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}
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}
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/* Process the message */
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processMessage(messageBuffer);
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}
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}
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/* TODO: Pass in type and just payload or what */
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private bool dispatch(string payloadType, JSONValue payload)
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{
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/* TODO: Implement me */
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debugPrint("Dispatching payload [" ~ payloadType ~ "]");
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debugPrint("Payload: " ~ payload.toPrettyString());
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/* Status of dispatch */
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bool dispatchStatus = true;
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/* Lookup the payloadType handler */
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MessageHandler chosenHandler;
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for(uint i = 0; i < server.handlers.length; i++)
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{
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if(cmp(server.handlers[i].getPluginName(), payloadType) == 0)
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{
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chosenHandler = server.handlers[i];
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break;
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}
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}
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if(chosenHandler)
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{
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/* TODO: Send and receive data here */
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/* Handler's UNIX domain socket */
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Socket handlerSocket = chosenHandler.getSocket();
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/* Get the payload as a string */
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string payloadString = toJSON(payload);
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/* Construct the data to send */
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byte[] sendBuffer;
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/* TODO: Add 4 bytes of payload length encded in little endian */
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int payloadLength = cast(int)payloadString.length;
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byte* lengthBytes = cast(byte*)&payloadLength;
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sendBuffer ~= *(lengthBytes+0);
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sendBuffer ~= *(lengthBytes+1);
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sendBuffer ~= *(lengthBytes+2);
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sendBuffer ~= *(lengthBytes+3);
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/* Add the string bytes */
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sendBuffer ~= cast(byte[])payloadString;
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/* TODO: Send payload */
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writeln("Send buffer: ", sendBuffer);
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debugPrint("Sending payload over to handler for \"" ~ chosenHandler.getPluginName() ~ "\".");
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handlerSocket.send(sendBuffer);
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/* TODO: Get response */
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debugPrint("Waiting for response from handler for \"" ~ chosenHandler.getPluginName() ~ "\".");
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/* Construct a buffer to receive into */
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byte[] receiveBuffer;
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/* The current byte */
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uint currentByte = 0;
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/* The amount of bytes received */
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long bytesReceived;
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/* Loop consume the next 4 bytes */
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while(currentByte < 4)
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{
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/* Temporary buffer */
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byte[4] tempBuffer;
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/* Read at-most 4 bytes */
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bytesReceived = handlerSocket.receive(tempBuffer);
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/* If there was an error reading from the socket */
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if(!(bytesReceived > 0))
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{
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/* TODO: Error handling */
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debugPrint("Error receiving from UNIX domain socket");
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}
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/* If there is no error reading from the socket */
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else
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{
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/* Add the read bytes to the *real* buffer */
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receiveBuffer ~= tempBuffer[0..bytesReceived];
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/* Increment the byte counter */
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currentByte += bytesReceived;
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}
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}
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/* Response message length */
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int messageLength = *cast(int*)receiveBuffer.ptr;
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writeln("Message length is: ", cast(uint)messageLength);
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/* Response message buffer */
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byte[] fullMessage;
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/* Reset the byte counter */
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currentByte = 0;
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while(currentByte < messageLength)
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{
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debugPrint("dhjkh");
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/**
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* Receive 20 bytes (at most) at a time and don't dequeue from
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* the kernel's TCP stack's buffer.
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*/
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byte[20] tempBuffer;
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bytesReceived = handlerSocket.receive(tempBuffer, SocketFlags.PEEK);
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/* Check for an error whilst receiving */
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if(!(bytesReceived > 0))
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{
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/* TODO: Error handling */
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debugPrint("Error whilst receiving from unix domain socket");
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}
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else
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{
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/* TODO: Make sure we only take [0, messageLength) bytes */
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if(cast(uint)bytesReceived+currentByte > messageLength)
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{
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byte[] remainingBytes;
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remainingBytes.length = messageLength-currentByte;
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handlerSocket.receive(remainingBytes);
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/* Increment counter of received bytes */
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currentByte += remainingBytes.length;
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/* Append the received bytes to the FULL message buffer */
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fullMessage ~= remainingBytes;
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writeln("Received ", currentByte, "/", cast(uint)messageLength, " bytes");
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}
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else
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{
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/* Increment counter of received bytes */
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currentByte += bytesReceived;
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/* Append the received bytes to the FULL message buffer */
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fullMessage ~= tempBuffer[0..bytesReceived];
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/* TODO: Bug when over send, we must not allow this */
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writeln("Received ", currentByte, "/", cast(uint)messageLength, " bytes");
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handlerSocket.receive(tempBuffer);
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}
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}
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}
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writeln("MEssage ", fullMessage);
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//int messageLength = 0;
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/* TODO: Loop for collect message */
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/* TODO: So now we have to think about what the hell it means
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* for a response to be received, like cool and all, but we need
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* the server to now do something.
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*/
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/* TODO: Set dispatchStatus */
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}
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else
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{
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/* TODO: Error handling */
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debugPrint("No message handler for payload type \"" ~ payloadType ~ "\" found.");
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dispatchStatus = false;
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}
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/* TODO: Set return value */
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debugPrint("Dispatch status: " ~ to!(string)(dispatchStatus));
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return dispatchStatus;
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}
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/* TODO: Version 2 of message dispatcher */
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private bool dispatchMessage(JSONValue payloadBlock)
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{
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/* Status of dispatch */
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bool dispatchStatus = true;
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/* TODO: Bounds checking, type checking */
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/* Get the payload type */
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string payloadType = payloadBlock["type"].str;
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debugPrint("Payload type is \"" ~ payloadType ~ "\"");
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/* Get the payload data */
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JSONValue payloadData = payloadBlock["data"];
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/* Lookup the payloadType handler */
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MessageHandler chosenHandler;
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for(uint i = 0; i < server.handlers.length; i++)
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{
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if(cmp(server.handlers[i].getPluginName(), payloadType) == 0)
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{
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chosenHandler = server.handlers[i];
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break;
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}
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}
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/* TODO: Continue here */
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return dispatchStatus;
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}
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/* Process the received message */
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private void processMessage(byte[] messageBuffer)
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{
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/* The message as a JSONValue struct */
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JSONValue jsonMessage;
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/* Attempt to convert the message to JSON */
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try
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{
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/* Convert message to JSON */
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jsonMessage = parseJSON(cast(string)messageBuffer);
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debugPrint("<<< Received JSON >>>\n\n" ~ jsonMessage.toPrettyString());
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/* TODO: Bounds checking, type checking */
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/* Get the header */
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JSONValue headerBlock = jsonMessage["header"];
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/* Get the authentication block */
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JSONValue authenticationBlock = headerBlock["authentication"];
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/* Get the username and password */
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JSONValue username = authenticationBlock["username"], password = authenticationBlock["password"];
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/* Get the payload block */
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JSONValue payloadBlock = jsonMessage["payload"];
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/* Dispatch the message */
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bool dispatchStatus = dispatchMessage(payloadBlock);
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if(dispatchStatus)
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{
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debugPrint("Dispatch succeeded");
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}
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else
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{
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/* TODO: Error handling */
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debugPrint("Dispatching failed...");
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}
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}
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/* If thr attempt to convert the message to JSON fails */
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catch(JSONException exception)
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{
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debugPrint("<<< There was an error whilst parsing the JSON message >>>\n\n"~exception.toString());
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}
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try
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{
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/* Convert message to JSON */
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jsonMessage = parseJSON(cast(string)messageBuffer);
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writeln("JSON received: ", jsonMessage);
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/* Make sure we have a JSON object */
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if(jsonMessage.type == JSONType.object)
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{
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/* As per spec, look for the "besterHeader" */
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JSONValue besterHeader;
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/* TODO: Check for out of bounds here */
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besterHeader = jsonMessage["header"];
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/* Check if it is a JSON object */
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if(besterHeader.type == JSONType.object)
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{
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/* TODO: Add further checks here */
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/* TODO: Bounds check */
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JSONValue payloadType;
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payloadType = besterHeader["type"];
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/* The payload type must be a string */
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if(payloadType.type == JSONType.string)
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{
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string payloadTypeString = payloadType.str;
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/* TODO: Move everything into this block */
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/* The header must contain a scope block */
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JSONValue scopeBlock;
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/* TODO: Add bounds check */
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scopeBlock = besterHeader["scope"];
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/* Make sure the type of the JSON value is string */
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if(scopeBlock.type == JSONType.string)
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{
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/* Get the scope */
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string scopeString = scopeBlock.str;
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/* If the message is for client<->server */
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if(cmp(scopeString, "client"))
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{
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debugPrint("Scope: client<->server");
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/* The header must contain a authentication JSON object */
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JSONValue authenticationBlock;
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/* TODO: Check for out of bounds here */
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authenticationBlock = besterHeader["authentication"];
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/* TODO: Bounds check for both below */
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JSONValue username, password;
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username = authenticationBlock["username"];
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password = authenticationBlock["password"];
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if(username.type == JSONType.string && password.type == JSONType.string)
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{
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/* TODO: Now do some stuff */
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/* TODO: Authenticate the user */
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string usernameString = username.str;
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string passwordString = password.str;
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bool isAuthenticated = server.authenticate(usernameString, passwordString);
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if(isAuthenticated)
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{
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debugPrint("Authenticated");
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/* Get the payload */
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JSONValue payload;
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/* TODO: Bounds check */
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payload = jsonMessage["payload"];
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/* TODO: Dispatch to the correct message handler */
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dispatch(payloadTypeString, payload);
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}
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else
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{
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/* TODO: Add error handling here */
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debugPrint("Authentication failure");
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}
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}
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else
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{
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/* TODO: Add error handling here */
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debugPrint("Username or password is not a JSON string");
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}
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}
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/* If the message is for server<->server */
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else if(cmp(scopeString, "server"))
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{
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debugPrint("Scope: server<->server");
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}
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else
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{
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/* TODO: Error handling */
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debugPrint("Unknown scope provided");
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}
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}
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else
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{
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/* TODO: Handle error */
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debugPrint("Scope block JSON value not a string");
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}
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}
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else
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{
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/* TODO: Add error handling */
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debugPrint("Type is not of type JSON string");
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}
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}
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else
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{
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/* TODO: Add error handling here */
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debugPrint("Header received was not a JSON object");
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}
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}
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else
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{
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/* TODO: Add error here */
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debugPrint("Did not receive a JSON object");
|
|
}
|
|
}
|
|
catch(JSONException exception)
|
|
{
|
|
/* TODO: Implement this */
|
|
debugPrint("Error parsing the received JSON message: " ~ exception.toString());
|
|
}
|
|
|
|
}
|
|
|
|
|
|
} |