Merge branch 'master' into gossip-girl

7 files changed, 349 insertions, 14 deletions

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
index 26f0e0b..256fa6b 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
@@ -1,5 +1,8 @@
 package pl.edu.mimuw.cloudatlas.agent;
 
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
 import java.rmi.registry.LocateRegistry;
 import java.rmi.registry.Registry;
 import java.rmi.server.UnicastRemoteObject;
@@ -12,14 +15,8 @@ import pl.edu.mimuw.cloudatlas.agent.NewApiImplementation;
 import pl.edu.mimuw.cloudatlas.agent.messages.RunQueriesMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.TimerSchedulerMessage;
 import pl.edu.mimuw.cloudatlas.agent.messages.UpdateAttributesMessage;
+import pl.edu.mimuw.cloudatlas.agent.modules.*;
 import pl.edu.mimuw.cloudatlas.agent.modules.Module;
-import pl.edu.mimuw.cloudatlas.agent.modules.ModuleType;
-import pl.edu.mimuw.cloudatlas.agent.modules.Qurnik;
-import pl.edu.mimuw.cloudatlas.agent.modules.Remik;
-import pl.edu.mimuw.cloudatlas.agent.modules.Stanik;
-import pl.edu.mimuw.cloudatlas.agent.modules.RecursiveScheduledTask;
-import pl.edu.mimuw.cloudatlas.agent.modules.TimerScheduledTask;
-import pl.edu.mimuw.cloudatlas.agent.modules.TimerScheduler;
 import pl.edu.mimuw.cloudatlas.api.Api;
 import pl.edu.mimuw.cloudatlas.interpreter.Main;
 import pl.edu.mimuw.cloudatlas.model.PathName;
@@ -49,6 +46,11 @@ public class Agent {
         Long freshnessPeriod = new Long(System.getProperty("freshness_period"));
         modules.put(ModuleType.STATE, new Stanik(freshnessPeriod));
         modules.put(ModuleType.QUERY, new Qurnik());
+        try {
+            modules.put(ModuleType.UDP, new UDUP(InetAddress.getByName("127.0.0.1"), 5988, 5000, 20000));
+        } catch (UnknownHostException e) {
+            e.printStackTrace();
+        }
         // TODO add modules as we implement them
         return modules;
     }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/UDUPMessage.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/UDUPMessage.java
new file mode 100644
index 0000000..fa8d1fa
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/messages/UDUPMessage.java
@@ -0,0 +1,45 @@
+package pl.edu.mimuw.cloudatlas.agent.messages;
+
+import pl.edu.mimuw.cloudatlas.agent.modules.Module;
+import pl.edu.mimuw.cloudatlas.agent.modules.ModuleType;
+import pl.edu.mimuw.cloudatlas.model.ValueContact;
+
+public class UDUPMessage extends AgentMessage {
+    private ValueContact contact;
+    private AgentMessage content;
+
+    public UDUPMessage(String messageId, long timestamp, ValueContact contact, AgentMessage content) {
+        super(messageId, ModuleType.UDP, timestamp);
+        this.contact = contact;
+        this.content = content;
+    }
+
+    public UDUPMessage(String messageId, ValueContact contact, AgentMessage content) {
+        super(messageId, ModuleType.UDP);
+        this.contact = contact;
+        this.content = content;
+    }
+
+    public UDUPMessage() {
+        super("", ModuleType.UDP);
+    }
+
+    @Override
+    public void callMe(Module module) throws InterruptedException, Module.InvalidMessageType {
+        module.handleTyped(this);
+    }
+
+    public AgentMessage getContent() {
+        return content;
+    }
+
+    public void setContent(AgentMessage content) {
+        this.content = content;
+    }
+
+    public ValueContact getContact() { return contact; }
+
+    public void setContact(ValueContact contact) {
+        this.contact = contact;
+    }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Module.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Module.java
index 5511607..ec87649 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Module.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/Module.java
@@ -1,13 +1,7 @@
 package pl.edu.mimuw.cloudatlas.agent.modules;
 
 import pl.edu.mimuw.cloudatlas.agent.Executor;
-import pl.edu.mimuw.cloudatlas.agent.messages.AgentMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.GossipGirlMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.TimerSchedulerMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.QurnikMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.RemikMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.ResponseMessage;
-import pl.edu.mimuw.cloudatlas.agent.messages.StanikMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.*;
 
 /*
  * A Module is a (potentially stateful) event handler.
@@ -54,6 +48,10 @@ public abstract class Module {
         throw new InvalidMessageType("Got a ResponseMessage in module " + moduleType.toString());
     }
 
+    public void handleTyped(UDUPMessage message) throws InterruptedException, InvalidMessageType {
+        throw new InvalidMessageType("Got a ResponseMessage in module " + moduleType.toString());
+    }
+
     public void setExecutor(Executor executor) {
         this.executor = executor;
     }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java
new file mode 100644
index 0000000..e616c93
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUP.java
@@ -0,0 +1,73 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.SocketException;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+/**
+ * Communication over UDP
+ *
+ * Client-server exchange pattern:
+ *  server: init message
+ *  client: ack message
+ *
+ *  retry count
+ *  retry timeout after which retry happens
+ **
+ *  udp sends initiator module success/failure information
+ *
+ *  we have udps on different addresses with the same ports
+ *  due to ValueContact design
+ */
+
+// TODO set server port in global config - must be the same everywhere
+// TODO same with buffer size
+
+public class UDUP extends Module implements Runnable {
+    private UDUPClient client;
+    private UDUPServer server;
+    private final AtomicBoolean running;
+
+    public UDUP(InetAddress serverAddr,
+                int serverPort,
+                int timeout,
+                int bufferSize) {
+        super(ModuleType.UDP);
+        this.running = new AtomicBoolean(false);
+        try {
+            this.client = new UDUPClient(this, serverPort, bufferSize);
+            this.server = new UDUPServer(this, serverAddr, serverPort, bufferSize);
+            this.running.getAndSet(true);
+        } catch (SocketException e) {
+            e.printStackTrace();
+            this.client.close();
+            this.server.close();
+        }
+    }
+
+    public void run() {
+        System.out.println("UDP server running");
+        while(this.running.get()) {
+            try {
+                this.server.acceptMessage();
+            } catch (IOException | InterruptedException e) {
+                e.printStackTrace();
+                this.running.getAndSet(false);
+                this.server.close();
+            }
+        }
+    }
+
+    public void handleTyped(UDUPMessage event) throws InterruptedException {
+        System.out.println("UDP sending message " + event.getContent().getMessageId());
+        try {
+            this.client.sendMessage(event);
+        } catch (IOException e) {
+            System.out.println("UDP send message failed");
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPClient.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPClient.java
new file mode 100644
index 0000000..82aaeb1
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPClient.java
@@ -0,0 +1,47 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+
+import java.io.IOException;
+import java.net.*;
+
+public class UDUPClient {
+    private UDUP udp;
+    private UDUPSerializer serializer;
+    private int serverPort;
+    private DatagramSocket socket;
+    private int bufsize;
+
+    UDUPClient(UDUP udp, int serverPort, int bufferSize) throws SocketException {
+        this.udp = udp;
+        this.serverPort = serverPort;
+        this.socket = new DatagramSocket();
+        this.bufsize = bufferSize;
+        this.serializer = new UDUPSerializer();
+    }
+
+    public void sendMessage(UDUPMessage msg) throws IOException {
+        int offset = 0;
+        int outputSize;
+
+        byte[] buf = this.serializer.serialize(msg);
+        outputSize = buf.length;
+
+        do {
+            outputSize =- bufsize;
+            offset += bufsize;
+            DatagramPacket packet = new DatagramPacket(buf, buf.length, msg.getContact().getAddress(), this.serverPort);
+            System.out.println("UDP sends message: ");
+            for (byte b : buf) {
+                System.out.print(b);
+            }
+            System.out.println("to " + packet.getAddress());
+            this.socket.send(packet);
+        } while (outputSize > bufsize);
+    }
+
+    void close() {
+        this.socket.close();
+    }
+
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPSerializer.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPSerializer.java
new file mode 100644
index 0000000..ac35265
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPSerializer.java
@@ -0,0 +1,98 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import pl.edu.mimuw.cloudatlas.agent.messages.AgentMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.GetStateMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.StanikMessage;
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+import pl.edu.mimuw.cloudatlas.model.PathName;
+import pl.edu.mimuw.cloudatlas.model.ValueContact;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+/**
+ * Serializes classes to and from byte arrays for UDP use
+ */
+public class UDUPSerializer {
+    private Kryo kryo;
+
+    UDUPSerializer() {
+        kryo = new Kryo();
+        kryo.setReferences(true);
+        kryo.setRegistrationRequired(true);
+        registerClasses();
+    }
+
+    private void registerClasses() {
+
+        kryo.register(Inet4Address.class, new Serializer() {
+
+            @Override
+            public void write(Kryo kryo, Output output, Object object) {
+                InetAddress ia = (InetAddress) object;
+                kryo.writeObject(output, ia.getAddress());
+            }
+
+            @Override
+            public Object read(Kryo kryo, Input input, Class type) {
+                try {
+                    byte[] buf = kryo.readObject(input, byte[].class);
+                    InetAddress addr = Inet4Address.getByAddress(buf);
+                    return addr;
+                } catch (UnknownHostException e) {
+                    System.out.println("Custom InetAddress read failed");
+                    e.printStackTrace();
+                    return null;
+                }
+            }
+        });
+
+        kryo.register(PathName.class, new Serializer() {
+
+            @Override
+            public void write(Kryo kryo, Output output, Object object) {
+                PathName pn = (PathName) object;
+                kryo.writeObject(output, pn.getName());
+            }
+
+            @Override
+            public Object read(Kryo kryo, Input input, Class type) {
+                String addr = input.readString();
+                return new PathName(addr);
+            }
+        });
+
+        kryo.register(byte[].class);
+        kryo.register(ValueContact.class);
+        kryo.register(ModuleType.class);
+
+        kryo.register(AgentMessage.class);
+        kryo.register(GetStateMessage.class);
+        kryo.register(UDUPMessage.class);
+        kryo.register(StanikMessage.Type.class);
+        kryo.register(StanikMessage.class);
+    }
+
+    public UDUPMessage deserialize(byte[] packetData) {
+        ByteArrayInputStream in = new ByteArrayInputStream(packetData);
+        Input kryoInput = new Input(in);
+        UDUPMessage msg = kryo.readObject(kryoInput, UDUPMessage.class);
+        return msg;
+    }
+
+    public byte[] serialize(UDUPMessage msg) {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        Output kryoOut = new Output(out);
+        kryo.writeObject(kryoOut, msg);
+        kryoOut.flush();
+        kryoOut.close();
+        return out.toByteArray();
+    }
+}
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java
new file mode 100644
index 0000000..6807a86
--- /dev/null
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/modules/UDUPServer.java
@@ -0,0 +1,72 @@
+package pl.edu.mimuw.cloudatlas.agent.modules;
+
+import com.google.common.primitives.Bytes;
+import pl.edu.mimuw.cloudatlas.agent.messages.UDUPMessage;
+
+import java.io.IOException;
+import java.net.*;
+import java.util.HashMap;
+
+public class UDUPServer {
+    private UDUP udp;
+    private UDUPSerializer serializer;
+    private DatagramSocket socket;
+    private InetAddress address;
+    private HashMap<InetAddress, byte[]> partialPackets;
+    private int bufSize;
+
+    public UDUPServer(UDUP udp, InetAddress addr, int port, int bufSize) throws SocketException {
+        this.udp = udp;
+        this.socket = new DatagramSocket(port, addr);
+        this.address = addr;
+        this.bufSize = bufSize;
+        this.partialPackets = new HashMap<>();
+        this.serializer = new UDUPSerializer();
+    }
+
+    public void acceptMessage() throws IOException, InterruptedException {
+        byte[] buf = new byte[bufSize];
+        DatagramPacket packet = new DatagramPacket(buf, buf.length);
+        this.socket.receive(packet);
+        System.out.println("UDP " + this.address + " received packet from " + packet.getAddress());
+
+        if (packet.getOffset() == 0) {
+            UDUPMessage msg = this.serializer.deserialize(packet.getData());
+            System.out.println("UDP received message " + msg.getContent().getMessageId());
+
+            if (packet.getLength() == this.bufSize) {
+                this.addPartialMessageAndCheckSerialization(packet.getAddress(), packet.getData());
+            } else  {
+                if (msg.getContent().getDestinationModule() == ModuleType.TEST) {
+                    System.out.println("UDP server: test message received");
+                } else if (msg.getContent().getDestinationModule() != ModuleType.UDP) {
+                    this.udp.sendMessage(msg.getContent());
+                }
+            }
+        } else {
+            this.addPartialMessageAndCheckSerialization(packet.getAddress(), packet.getData());
+        }
+    }
+
+    public void addPartialMessageAndCheckSerialization(InetAddress senderAddress, byte[] packetData) {
+        if (this.partialPackets.containsKey(senderAddress)) {
+            byte[] previousPacketData = this.partialPackets.get(senderAddress);
+            byte[] allPacketData = Bytes.concat(previousPacketData, packetData);
+            try {
+                UDUPMessage msg = this.serializer.deserialize(allPacketData);
+                this.udp.sendMessage(msg.getContent());
+                this.partialPackets.remove(senderAddress);
+            } catch (Error | Exception e) {
+                System.out.println("Kryo didn't deserialize partial message, waiting to receive the rest");
+                this.partialPackets.put(senderAddress, allPacketData);
+            }
+        } else {
+            this.partialPackets.put(senderAddress, packetData);
+        }
+    }
+
+    public void close() {
+        this.socket.close();
+    }
+
+}