316 lines
10 KiB
Java
316 lines
10 KiB
Java
package protocolP2P;
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import exception.InternalError;
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import exception.ProtocolError;
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import exception.SizeError;
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import exception.TransmissionError;
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import exception.VersionError;
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import exception.SocketClosed;
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import remoteException.EmptyDirectory;
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import remoteException.InternalRemoteError;
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import remoteException.NotFound;
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import remoteException.ProtocolRemoteError;
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import remoteException.VersionRemoteError;
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import remoteException.EmptyFile;
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import tools.BytesArrayTools;
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import protocolP2P.Payload;
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import protocolP2P.RequestResponseCode;
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import protocolP2P.LoadRequest;
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import protocolP2P.FileList;
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import protocolP2P.FilePart;
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import java.util.ArrayList;
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import java.lang.Byte;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.Socket;
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/** Representation of packet.
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* @author Louis Royer
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* @author Flavien Haas
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* @author JS Auge
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* @version 1.0
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*/
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public class ProtocolP2PPacketTCP extends ProtocolP2PPacket {
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private Socket responseSocket; // socket used to recept request and send response
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private Socket requestSocket; // socket used to send request and to reception response
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/** Constructor with payload parameter (typically used when sending packet).
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* @param payload the payload associated with the packet to send
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*/
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public ProtocolP2PPacketTCP(Payload payload) {
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super(payload);
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}
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/** Send a Packet. Socket must be set and connected.
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* @param socket Socket used to send Packet.
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* @throws InternalError
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* @throws SocketClosed
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* @throws IOException
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*/
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protected void send(Socket socket) throws InternalError, SocketClosed, IOException {
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assert socket != null : "Trying to send a Packet but no socket defined";
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assert socket.isConnected() : "Trying to send a Packet but socket not connected";
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if (socket == null || (!socket.isConnected())) {
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throw new InternalError();
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}
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// generate Packet
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byte[] packet = toPacket();
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// send it
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try {
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OutputStream outputStream = socket.getOutputStream();
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outputStream.write(packet);
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outputStream.flush();
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} catch (IOException e) {
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// Error: cannot send response, closing socket
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try {
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socket.close();
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} catch (IOException e2) {
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System.err.println("Cannot close socket");
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} finally {
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throw new SocketClosed();
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}
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}
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}
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/** Send a Request throught socket. Socket must be connected (typically used from client).
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* @param socket Socket. Must be connected.
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* @throws InternalError
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* @throws SocketClosed
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* @throws IOException
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*/
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public void sendRequest(Object socket) throws InternalError, IOException, SocketClosed {
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assert socket instanceof Socket: "Wrong socket type";
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if (socket instanceof Socket) {
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requestSocket = (Socket)socket;
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send(requestSocket);
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} else {
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throw new InternalError();
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}
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}
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/** Receive Request (typically used from server).
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* @param socket socket used to receive request
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* @throws TransmissionError
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* @throws ProtocolError
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* @throws VersionError
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* @throws InternalError
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* @throws SizeError
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* @throws SocketClosed
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* @throws IOException
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* @return ProtocolP2PPacket received.
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*/
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public ProtocolP2PPacketTCP(Object socket) throws TransmissionError, ProtocolError, VersionError, InternalError, SizeError, SocketClosed, IOException {
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super(socket);
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assert socket instanceof Socket : "Wrong socket type";
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if (!(socket instanceof Socket)) {
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throw new InternalError();
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}
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Socket ss = (Socket)socket;
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byte[] packet = new byte[1024];
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try {
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System.err.println("Reading " + ss.getInputStream().read(packet) + " bytes");
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} catch (IOException e) {
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// Error: cannot read request, closing socket
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try {
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ss.close();
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} catch (IOException e2) {
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System.err.println("Cannot close socket");
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} finally {
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throw new SocketClosed();
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}
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}
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// contruction
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boolean protocolError = false;
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try {
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constructPacket(packet, ss);
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Payload payload = getPayload();
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switch (payload.getRequestResponseCode()) {
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case PROTOCOL_ERROR :
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// we do not want to create an infinite loop of protocolError message exchange.
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protocolError = true;
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break;
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case VERSION_ERROR :
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case INTERNAL_ERROR :
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case EMPTY_DIRECTORY :
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case NOT_FOUND :
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case EMPTY_FILE:
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case LOAD_RESPONSE:
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case LIST_RESPONSE:
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// we were expecting a request, but we are receiving a response
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throw new ProtocolError();
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default :
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break;
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}
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} catch (TransmissionError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(ss);
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throw e;
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} catch (ProtocolError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.PROTOCOL_ERROR))).send(ss);
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throw e;
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} catch (VersionError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.VERSION_ERROR))).send(ss);
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throw e;
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} catch (InternalError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(ss);
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throw e;
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} catch (SizeError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(ss);
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throw e;
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}
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if (protocolError) {
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throw new ProtocolError();
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}
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}
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/** Send a Response to a Request (typically used from server).
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* @param response Packet to send as a response.
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* @throws InternalError
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* @throws IOException
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* @throws SocketClosed
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*/
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public void sendResponse(ProtocolP2PPacket response) throws InternalError, IOException, SocketClosed {
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assert response instanceof ProtocolP2PPacketTCP: "Wrong Packet type";
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if (response instanceof ProtocolP2PPacketTCP) {
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ProtocolP2PPacketTCP r = (ProtocolP2PPacketTCP) response;
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assert responseSocket != null : "Cannot send response to a packet not received";
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if (responseSocket == null) {
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throw new InternalError();
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}
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r.send(responseSocket);
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} else {
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throw new InternalError();
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}
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}
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/** Receive response (typically used by client).
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* @return ProtocolP2PPacket received
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* @throws EmptyFile
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* @throws NotFound
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* @throws EmptyDirectory
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* @throws InternalRemoteError
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* @throws VersionRemoteError
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* @throws ProtocolRemoteError
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* @throws TransmissionError
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* @throws ProtocolError
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* @throws VersionError
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* @throws InternalError
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* @throws SizeError
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* @throws IOException
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* @throws SocketClosed
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*/
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public ProtocolP2PPacket receiveResponse() throws EmptyFile, NotFound, EmptyDirectory, InternalRemoteError, VersionRemoteError, ProtocolRemoteError, TransmissionError, ProtocolError, VersionError, InternalError, SizeError, IOException, SocketClosed {
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assert requestSocket != null : "Cannot receive response because request packet not sent.";
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if (requestSocket == null) {
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throw new InternalError();
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}
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// reception
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byte[] packet = new byte[8192];
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requestSocket.getInputStream().read(packet);
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// contruction
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try {
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ProtocolP2PPacketTCP p = new ProtocolP2PPacketTCP(packet);
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Payload payload = p.getPayload();
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switch (payload.getRequestResponseCode()) {
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case PROTOCOL_ERROR :
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throw new ProtocolRemoteError();
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case VERSION_ERROR :
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throw new VersionRemoteError();
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case INTERNAL_ERROR :
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throw new InternalRemoteError();
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case EMPTY_DIRECTORY :
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throw new EmptyDirectory();
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case NOT_FOUND :
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throw new NotFound();
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case EMPTY_FILE:
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throw new EmptyFile();
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default :
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return (ProtocolP2PPacket)p;
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}
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} catch (TransmissionError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(requestSocket);
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throw e;
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} catch (ProtocolError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.PROTOCOL_ERROR))).send(requestSocket);
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throw e;
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} catch (VersionError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.VERSION_ERROR))).send(requestSocket);
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throw e;
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} catch (InternalError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(requestSocket);
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throw e;
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} catch (SizeError e) {
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(new ProtocolP2PPacketTCP(new Payload(RequestResponseCode.INTERNAL_ERROR))).send(requestSocket);
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throw e;
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}
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}
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/** Private constructor with packet as byte[] parameter (typically used when receiving Packet response).
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* @param packet the full Packet received
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* @throws TransmissionError
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* @throws ProtocolError
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* @throws VersionError
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* @throws InternalError
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* @throws SizeError
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*/
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private ProtocolP2PPacketTCP(byte[] packet) throws TransmissionError, ProtocolError, VersionError, InternalError, SizeError {
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super(packet);
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constructPacket(packet);
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}
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/** Private constructor helper with packet as byte[] parameter (typically used when receiving Packet response/request).
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* @param packet the full Packet received
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* @throws TransmissionError
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* @throws ProtocolError
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* @throws VersionError
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* @throws InternalError
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* @throws SizeError
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*/
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private void constructPacket(byte[] packet) throws TransmissionError, ProtocolError, VersionError, InternalError, SizeError {
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// unwrap version
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version = packet[VERSION_POSITION];
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checkProtocolVersion(); // this can throw VersionError
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RequestResponseCode r = RequestResponseCode.fromCode(packet[RequestResponseCode.RRCODE_POSITION]); // this can throw ProtocolError
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switch (r) {
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case LIST_RESPONSE:
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payload = (Payload) new FileList(packet);
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break;
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case LOAD_RESPONSE:
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payload = (Payload) new FilePart(packet);
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break;
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case LOAD_REQUEST:
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payload = (Payload) new LoadRequest(packet);
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break;
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default:
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payload = new Payload(packet); // this can throw TransmissionError
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break;
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}
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}
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/** Private constructor helper with packet as byte[] parameter and (typically used when receiving Packet request).
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* @param packet the full Packet received
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* @param responseSocket socket address used to reception this request (use this one to respond)
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* @throws TransmissionError
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* @throws ProtocolError
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* @throws VersionError
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* @throws InternalError
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* @throws SizeError
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*/
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private void constructPacket(byte[] packet, Socket responseSocket) throws TransmissionError, ProtocolError, VersionError, InternalError, SizeError {
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constructPacket(packet);
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this.responseSocket = responseSocket;
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}
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/** Returns a byte[] containing full packet (typically used when sending packet).
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* This packet is complete and ready to be send.
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* @return the full packet to send
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* @throws InternalError
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*/
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protected byte[] toPacket() throws InternalError {
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byte[] packet = payload.toPacket();
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packet[VERSION_POSITION] = version;
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return packet;
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}
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}
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