root / proj / src / MessageParser.java @ 2
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import java.io.IOException; |
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import java.io.UnsupportedEncodingException; |
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import java.net.DatagramPacket; |
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import java.net.UnknownHostException; |
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import java.nio.charset.Charset; |
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import java.nio.charset.StandardCharsets; |
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import java.util.Arrays; |
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import java.util.Random; |
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import java.util.concurrent.TimeUnit; |
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public class MessageParser implements Runnable { |
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Peer peer; |
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DatagramPacket packet;
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public MessageParser(DatagramPacket packet, Peer peer) { |
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this.peer = peer;
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this.packet = packet;
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} |
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public void run() { |
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String str = null; |
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str = new String(packet.getData(),0, packet.getLength()); |
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String rest = null, fileID = null, messageType = null, version = null; |
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int i = 0, next = 0, chunkNo = 0, replicationDeg = 0, senderID=0; |
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byte[] body = null; |
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if(str.contains(" ")){ |
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i= str.indexOf(" ");
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messageType= str.substring(0,i);
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next = str.indexOf(" ", i+1); |
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version = str.substring(i,next).replace(" ",""); |
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i = next; |
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next = str.indexOf(" ", i+1); |
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senderID = Integer.parseInt(str.substring(i,next).replace(" ","")); |
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i = next; |
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next = str.indexOf(" ", i+1); |
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fileID = str.substring(i,next).replace(" ",""); |
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i = next; |
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next = str.indexOf(" ",i+1); |
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chunkNo = Integer.parseInt(str.substring(i,next).replace(" ","")); |
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i = next; |
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next = str.indexOf(" ",i+1); |
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replicationDeg = Integer.parseInt(str.substring(i,next).replace(" ","")); |
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rest = str.substring(next); |
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} |
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if(peer.getPeerID() == senderID) {
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return;
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} |
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String CRLF = "" + (char) 0xD + (char) 0xA; |
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String bodyString = rest.replaceFirst(CRLF+CRLF,""); |
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bodyString = bodyString.replaceFirst(" ", ""); |
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body = bodyString.getBytes(); |
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switch(messageType) {
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case "PUTCHUNK": |
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Chunk chunk = new Chunk(fileID, chunkNo, body);
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chunk.setGoalRepDeg(replicationDeg); |
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if(peer.getStorage().addChunk(chunk)) {
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Message stored = new Message("STORED",peer.getVersion(),peer.getPeerID(),fileID, chunkNo, 0, null); |
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byte[] reply = stored.sendable(); |
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try {
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Random rand = new Random(); |
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int n = rand.nextInt(400) + 1; |
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try {
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Thread.sleep(n);
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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peer.getMC().sendMessage(reply); |
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System.out.println(stored.messageToStringPrintable());
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} catch (UnknownHostException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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try {
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peer.saveChunks(); |
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} catch (IOException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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} |
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break;
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case "STORED": |
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peer.getStorage().getBackUps().add(new BackUpInfo(fileID, chunkNo, peer.getPeerID()));
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peer.getStorage().increaseChunkRepDeg(fileID, chunkNo); |
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break;
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case "GETCHUNK": //CHUNK <Version> <SenderId> <FileId> <ChunkNo> <CRLF><CRLF><Body> |
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Random rand = new Random(); |
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int n = rand.nextInt(400) + 1; |
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try {
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Thread.sleep(n);
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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for(Chunk chunkSend: peer.getStorage().getChunks()) {
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if(chunkSend.getFileID().equals(fileID) && chunkSend.getChunkN()==chunkNo) {
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Message sendChunk = new Message("CHUNK",peer.getVersion(),peer.getPeerID(),fileID, chunkNo, 0, chunkSend.getContent()); |
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byte[] reply = sendChunk.sendable(); |
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System.out.println(sendChunk.messageToStringPrintable());
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try {
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peer.getMDR().sendMessage(reply); |
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} catch (UnknownHostException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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} |
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} |
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break;
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case "CHUNK": //GETCHUNK <Version> <SenderId> <FileId> <ChunkNo> <CRLF><CRLF> |
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Chunk gotChunk = new Chunk(fileID, chunkNo, body);
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peer.getStorage().addChunk(gotChunk); |
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if(gotChunk.getContent().length < 58000) |
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peer.lastChunk(); |
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break;
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case "REMOVED": |
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if(peer.getStorage().lowerRepDeg(fileID, chunkNo)) {
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Random rand2 = new Random(); |
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int n2 = rand2.nextInt(400) + 1; |
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try {
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Thread.sleep(n2);
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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for(Chunk chunkSend: peer.getStorage().getChunks())
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{
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if(chunkSend.getFileID().equals(fileID) && chunkSend.getChunkN() == chunkNo)
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{
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boolean stored = false; |
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Message msg = new Message("PUTCHUNK", version, peer.getPeerID(),chunkSend.getFileID(),chunkNo, chunkSend.getGoalRepDeg()-chunkSend.getRepDeg(), |
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chunkSend.getContent()); |
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byte[] msgByte = msg.sendable(); |
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System.out.println(msg.messageToStringPrintable());
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try {
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peer.getMDB().sendMessage(msgByte); |
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} catch (UnknownHostException e2) { |
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// TODO Auto-generated catch block
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e2.printStackTrace(); |
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} |
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for(int j = 0; j < 5 && !stored; j++) { |
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try {
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TimeUnit.SECONDS.sleep(1+j); |
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} catch (InterruptedException e1) { |
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// TODO Auto-generated catch block
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e1.printStackTrace(); |
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} |
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if(peer.storedCheck(chunkNo, fileID) >= chunkSend.getGoalRepDeg()) {
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stored = true;
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} |
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else {
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try {
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peer.getMDB().sendMessage(msgByte); |
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} catch (UnknownHostException e) { |
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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System.out.println(msg.messageToStringPrintable());
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} |
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} |
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stored = false;
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} |
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} |
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} |
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break;
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case "DELETE": |
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peer.getStorage().deleteChunkByFileID(fileID); |
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peer.deleteFileFolder(fileID); |
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break;
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} |
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} |
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static byte[] trim(byte[] bytes) |
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{
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int i = bytes.length - 1; |
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while (i >= 0 && bytes[i] == 0) |
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{
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--i; |
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} |
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return Arrays.copyOf(bytes, i + 1); |
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} |
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} |
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