Network code now works well enough for the server to think it successfully established a connection

demo/build.gradle

@@ -0,0 +1,16 @@
+apply plugin: 'java'
+
+sourceCompatibility = 1.7
+version = '1.0'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile project(':domain')
+    compile project(':networking')
+    compile project(':inventory')
+    compile 'org.slf4j:slf4j-simple:1.7.12'
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}

demo/src/main/java/ch/dissem/bitmessage/demo/Main.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2015 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.bitmessage.demo;
+
+import ch.dissem.bitmessage.Context;
+import ch.dissem.bitmessage.entity.payload.ObjectPayload;
+import ch.dissem.bitmessage.inventory.SimpleAddressRepository;
+import ch.dissem.bitmessage.inventory.SimpleInventory;
+import ch.dissem.bitmessage.networking.NetworkNode;
+import ch.dissem.bitmessage.ports.NetworkHandler;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Created by chris on 06.04.15.
+ */
+public class Main {
+    public static void main(String[] args) throws IOException {
+        NetworkNode networkNode = new NetworkNode();
+        Context.init(new SimpleInventory(), new SimpleAddressRepository(), networkNode, 48444);
+        Context.getInstance().addStream(1);
+        networkNode.setListener(new NetworkHandler.MessageListener() {
+            @Override
+            public void receive(ObjectPayload payload) {
+                // TODO
+            }
+        });
+        networkNode.start();
+
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        System.out.print("Enter String");
+        br.readLine();
+    }
+}

domain/src/main/java/ch/dissem/bitmessage/Context.java

@@ -18,8 +18,12 @@ package ch.dissem.bitmessage;
 
 import ch.dissem.bitmessage.ports.AddressRepository;
 import ch.dissem.bitmessage.ports.Inventory;
-import ch.dissem.bitmessage.ports.NetworkMessageReceiver;
+import ch.dissem.bitmessage.ports.NetworkHandler;
-import ch.dissem.bitmessage.ports.NetworkMessageSender;
+
+import java.util.Collection;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.TreeSet;
 
 /**
  * Created by chris on 05.04.15.
@@ -31,19 +35,22 @@ public class Context {
 
     private Inventory inventory;
     private AddressRepository addressRepo;
-    private NetworkMessageSender sender;
+    private NetworkHandler networkHandler;
-    private NetworkMessageReceiver receiver;
+
+    private Collection<Long> streams = new TreeSet<>();
+
+    private int port;
 
     private Context(Inventory inventory, AddressRepository addressRepo,
-                    NetworkMessageSender sender, NetworkMessageReceiver receiver) {
+                    NetworkHandler networkHandler, int port) {
         this.inventory = inventory;
         this.addressRepo = addressRepo;
-        this.sender = sender;
+        this.networkHandler = networkHandler;
-        this.receiver = receiver;
+        this.port = port;
     }
 
-    public static void init(Inventory inventory, AddressRepository addressRepository, NetworkMessageSender sender, NetworkMessageReceiver receiver) {
+    public static void init(Inventory inventory, AddressRepository addressRepository, NetworkHandler networkHandler, int port) {
-        instance = new Context(inventory, addressRepository, sender, receiver);
+        instance = new Context(inventory, addressRepository, networkHandler, port);
     }
 
     public static Context getInstance() {
@@ -57,4 +64,25 @@ public class Context {
     public AddressRepository getAddressRepository() {
         return addressRepo;
     }
+
+    public int getPort() {
+        return port;
+    }
+
+    public long[] getStreams() {
+        long[] result = new long[streams.size()];
+        int i = 0;
+        for (long stream : streams) {
+            result[i++] = stream;
+        }
+        return result;
+    }
+
+    public void addStream(long stream) {
+        streams.add(stream);
+    }
+
+    public void removeStream(long stream) {
+        streams.remove(stream);
+    }
 }

domain/src/main/java/ch/dissem/bitmessage/entity/Version.java

@@ -146,7 +146,7 @@ public class Version implements MessagePayload {
         }
 
         public Builder defaults() {
-            version = Context.CURRENT;
+            version = Context.CURRENT_VERSION;
             services = 1;
             timestamp = System.currentTimeMillis() / 1000;
             nonce = new Random().nextInt();

domain/src/main/java/ch/dissem/bitmessage/entity/payload/Broadcast.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2015 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.bitmessage.entity.payload;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Created by chris on 07.04.15.
+ */
+public class Broadcast implements ObjectPayload {
+    private long stream;
+    private byte[] tag;
+    private byte[] encrypted;
+
+    public Broadcast(long stream, byte[] tag, byte[] encrypted) {
+        this.stream = stream;
+        this.tag = tag;
+        this.encrypted = encrypted;
+    }
+
+    @Override
+    public long getStream() {
+        return stream;
+    }
+
+    @Override
+    public void write(OutputStream stream) throws IOException {
+
+    }
+}

domain/src/main/java/ch/dissem/bitmessage/entity/payload/GenericPayload.java

@@ -23,12 +23,19 @@ import java.io.OutputStream;
  * Created by chris on 24.03.15.
  */
 public class GenericPayload implements ObjectPayload {
+    private long stream;
     private byte[] data;
 
-    public GenericPayload(byte[] data) {
+    public GenericPayload(long stream, byte[] data) {
+        this.stream=stream;
         this.data = data;
     }
 
+    @Override
+    public long getStream() {
+        return stream;
+    }
+
     @Override
     public void write(OutputStream stream) throws IOException {
         stream.write(data);

domain/src/main/java/ch/dissem/bitmessage/entity/payload/GetPubkey.java

@@ -23,10 +23,12 @@ import java.io.OutputStream;
  * Created by chris on 24.03.15.
  */
 public class GetPubkey implements ObjectPayload {
+    private long stream;
     private byte[] ripe;
     private byte[] tag;
 
-    public GetPubkey(byte[] ripeOrTag) {
+    public GetPubkey(long stream, byte[] ripeOrTag) {
+        this.stream=stream;
         switch (ripeOrTag.length) {
             case 20:
                 ripe = ripeOrTag;
@@ -39,6 +41,11 @@ public class GetPubkey implements ObjectPayload {
         }
     }
 
+    @Override
+    public long getStream() {
+        return stream;
+    }
+
     @Override
     public void write(OutputStream stream) throws IOException {
         if (tag != null) {

domain/src/main/java/ch/dissem/bitmessage/entity/payload/Msg.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2015 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.bitmessage.entity.payload;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Created by chris on 07.04.15.
+ */
+public class Msg implements ObjectPayload {
+    private long stream;
+    private byte[] encrypted;
+
+    public Msg(long stream, byte[] encrypted) {
+        this.stream = stream;
+        this.encrypted = encrypted;
+    }
+
+    @Override
+    public long getStream() {
+        return stream;
+    }
+
+    @Override
+    public void write(OutputStream stream) throws IOException {
+        stream.write(encrypted);
+    }
+}

domain/src/main/java/ch/dissem/bitmessage/entity/payload/ObjectPayload.java

@@ -22,4 +22,5 @@ import ch.dissem.bitmessage.entity.Streamable;
  * The payload of an 'object' command. This is shared by the network.
  */
 public interface ObjectPayload extends Streamable {
+    long getStream();
 }

domain/src/main/java/ch/dissem/bitmessage/entity/payload/Pubkey.java

@@ -22,8 +22,6 @@ package ch.dissem.bitmessage.entity.payload;
 public interface Pubkey extends ObjectPayload {
     long getVersion();
 
-    long getStream();
-
     byte[] getSigningKey();
 
     byte[] getEncryptionKey();

domain/src/main/java/ch/dissem/bitmessage/entity/payload/V2Pubkey.java

@@ -25,11 +25,21 @@ import java.io.OutputStream;
  * Created by chris on 24.03.15.
  */
 public class V2Pubkey implements Pubkey {
-    protected long streamNumber;
+    protected long stream;
     protected long behaviorBitfield;
     protected byte[] publicSigningKey;
     protected byte[] publicEncryptionKey;
 
+    protected V2Pubkey() {
+    }
+
+    private V2Pubkey(Builder builder) {
+        stream = builder.streamNumber;
+        behaviorBitfield = builder.behaviorBitfield;
+        publicSigningKey = builder.publicSigningKey;
+        publicEncryptionKey = builder.publicEncryptionKey;
+    }
+
     @Override
     public long getVersion() {
         return 2;
@@ -37,7 +47,7 @@ public class V2Pubkey implements Pubkey {
 
     @Override
     public long getStream() {
-        return streamNumber;
+        return stream;
     }
 
     @Override
@@ -56,4 +66,38 @@ public class V2Pubkey implements Pubkey {
         stream.write(publicSigningKey);
         stream.write(publicEncryptionKey);
     }
+
+    public static class Builder {
+        private long streamNumber;
+        private long behaviorBitfield;
+        private byte[] publicSigningKey;
+        private byte[] publicEncryptionKey;
+
+        public Builder() {
+        }
+
+        public Builder streamNumber(long streamNumber) {
+            this.streamNumber = streamNumber;
+            return this;
+        }
+
+        public Builder behaviorBitfield(long behaviorBitfield) {
+            this.behaviorBitfield = behaviorBitfield;
+            return this;
+        }
+
+        public Builder publicSigningKey(byte[] publicSigningKey) {
+            this.publicSigningKey = publicSigningKey;
+            return this;
+        }
+
+        public Builder publicEncryptionKey(byte[] publicEncryptionKey) {
+            this.publicEncryptionKey = publicEncryptionKey;
+            return this;
+        }
+
+        public V2Pubkey build() {
+            return new V2Pubkey(this);
+        }
+    }
 }

domain/src/main/java/ch/dissem/bitmessage/entity/payload/V3Pubkey.java

@@ -29,6 +29,17 @@ public class V3Pubkey extends V2Pubkey {
     long extraBytes;
     byte[] signature;
 
+    protected V3Pubkey(Builder builder) {
+        stream = builder.streamNumber;
+        behaviorBitfield = builder.behaviorBitfield;
+        publicSigningKey = builder.publicSigningKey;
+        publicEncryptionKey = builder.publicEncryptionKey;
+
+        nonceTrialsPerByte = builder.nonceTrialsPerByte;
+        extraBytes = builder.extraBytes;
+        signature = builder.signature;
+    }
+
     @Override
     public void write(OutputStream stream) throws IOException {
         super.write(stream);
@@ -42,4 +53,57 @@ public class V3Pubkey extends V2Pubkey {
     public long getVersion() {
         return 3;
     }
+
+    public static class Builder extends V2Pubkey.Builder {
+        private long streamNumber;
+        private long behaviorBitfield;
+        private byte[] publicSigningKey;
+        private byte[] publicEncryptionKey;
+
+        private long nonceTrialsPerByte;
+        private long extraBytes;
+        private byte[] signature;
+
+        public Builder() {
+        }
+
+        public Builder streamNumber(long streamNumber) {
+            this.streamNumber = streamNumber;
+            return this;
+        }
+
+        public Builder behaviorBitfield(long behaviorBitfield) {
+            this.behaviorBitfield = behaviorBitfield;
+            return this;
+        }
+
+        public Builder publicSigningKey(byte[] publicSigningKey) {
+            this.publicSigningKey = publicSigningKey;
+            return this;
+        }
+
+        public Builder publicEncryptionKey(byte[] publicEncryptionKey) {
+            this.publicEncryptionKey = publicEncryptionKey;
+            return this;
+        }
+
+        public Builder nonceTrialsPerByte(long nonceTrialsPerByte) {
+            this.nonceTrialsPerByte = nonceTrialsPerByte;
+            return this;
+        }
+
+        public Builder extraBytes(long extraBytes) {
+            this.extraBytes = extraBytes;
+            return this;
+        }
+
+        public Builder signature(byte[] signature) {
+            this.signature = signature;
+            return this;
+        }
+
+        public V3Pubkey build() {
+            return new V3Pubkey(this);
+        }
+    }
 }

domain/src/main/java/ch/dissem/bitmessage/entity/payload/V4Pubkey.java

@@ -23,15 +23,22 @@ import java.io.OutputStream;
  * Created by chris on 27.03.15.
  */
 public class V4Pubkey implements Pubkey {
-    private long streamNumber;
+    private long stream;
     private byte[] tag;
     private byte[] encrypted;
     private V3Pubkey decrypted;
 
+    public V4Pubkey(long stream, byte[] tag, byte[] encrypted) {
+        this.stream = stream;
+        this.tag = tag;
+        this.encrypted = encrypted;
+    }
+
     public V4Pubkey(V3Pubkey decrypted) {
+        this.stream = decrypted.stream;
+        // TODO: this.tag = new BitmessageAddress(this).doubleHash
         this.decrypted = decrypted;
 
-        // TODO: this.tag = new BitmessageAddress(this).doubleHash
     }
 
     @Override
@@ -47,7 +54,7 @@ public class V4Pubkey implements Pubkey {
 
     @Override
     public long getStream() {
-        return streamNumber;
+        return stream;
     }
 
     @Override

domain/src/main/java/ch/dissem/bitmessage/entity/valueobject/NetworkAddress.java

@@ -21,12 +21,9 @@ import ch.dissem.bitmessage.utils.Encode;
 
 import java.io.IOException;
 import java.io.OutputStream;
-import java.net.Inet6Address;
 import java.net.InetAddress;
-import java.net.Socket;
 import java.net.UnknownHostException;
 import java.util.Arrays;
-import java.util.Objects;
 
 /**
  * A node's address. It's written in IPv6 format.
@@ -51,6 +48,14 @@ public class NetworkAddress implements Streamable {
     private byte[] ipv6;
     private int port;
 
+    private NetworkAddress(Builder builder) {
+        time = builder.time;
+        stream = builder.stream;
+        services = builder.services;
+        ipv6 = builder.ipv6;
+        port = builder.port;
+    }
+
     public int getPort() {
         return port;
     }
@@ -63,14 +68,6 @@ public class NetworkAddress implements Streamable {
         }
     }
 
-    private NetworkAddress(Builder builder) {
-        time = builder.time;
-        stream = builder.stream;
-        services = builder.services;
-        ipv6 = builder.ipv6;
-        port = builder.port;
-    }
-
     @Override
     public boolean equals(Object o) {
         if (this == o) return true;
@@ -88,6 +85,11 @@ public class NetworkAddress implements Streamable {
         return result;
     }
 
+    @Override
+    public String toString() {
+        return toInetAddress() + ":" + port;
+    }
+
     @Override
     public void write(OutputStream stream) throws IOException {
         write(stream, false);

domain/src/main/java/ch/dissem/bitmessage/factory/Factory.java

@@ -17,10 +17,10 @@
 package ch.dissem.bitmessage.factory;
 
 import ch.dissem.bitmessage.entity.NetworkMessage;
-import ch.dissem.bitmessage.entity.payload.GenericPayload;
+import ch.dissem.bitmessage.entity.payload.*;
-import ch.dissem.bitmessage.entity.payload.GetPubkey;
-import ch.dissem.bitmessage.entity.payload.ObjectPayload;
 import ch.dissem.bitmessage.utils.Decode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
@@ -29,26 +29,63 @@ import java.io.InputStream;
  * Creates {@link NetworkMessage} objects from {@link InputStream InputStreams}
  */
 public class Factory {
+    public static final Logger LOG = LoggerFactory.getLogger(Factory.class);
+
     public static NetworkMessage getNetworkMessage(int version, InputStream stream) throws IOException {
         return new V3MessageFactory().read(stream);
     }
 
-    static ObjectPayload getObjectPayload(long objectType, long version, InputStream stream, int length) throws IOException {
+    static ObjectPayload getObjectPayload(long objectType, long version, long streamNumber, InputStream stream, int length) throws IOException {
         if (objectType < 4) {
             switch ((int) objectType) {
                 case 0: // getpubkey
-                    return new GetPubkey(Decode.bytes(stream, length));
+                    return new GetPubkey(streamNumber, Decode.bytes(stream, length));
                 case 1: // pubkey
-                    break;
+                    return parsePubkey((int) version, streamNumber, stream, length);
                 case 2: // msg
-                    break;
+                    return parseMsg((int) version, streamNumber, stream, length);
                 case 3: // broadcast
-                    break;
+                    return parseBroadcast((int) version, streamNumber, stream, length);
-            }
-            throw new RuntimeException("This must not happen, someone broke something in the code!");
-        } else {
-            // passthrough message
-            return new GenericPayload(Decode.bytes(stream, length));
             }
+            LOG.error("This should not happen, someone broke something in the code!");
+        }
+        // fallback: just store the message - we don't really care what it is
+        LOG.error("Unexpected object type: " + objectType);
+        return new GenericPayload(streamNumber, Decode.bytes(stream, length));
+    }
+
+    private static ObjectPayload parsePubkey(int version, long streamNumber, InputStream stream, int length) throws IOException {
+        switch (version) {
+            case 2:
+                return new V2Pubkey.Builder()
+                        .streamNumber(streamNumber)
+                        .behaviorBitfield(Decode.int64(stream))
+                        .publicSigningKey(Decode.bytes(stream, 64))
+                        .publicEncryptionKey(Decode.bytes(stream, 64))
+                        .build();
+            case 3:
+                V3Pubkey.Builder v3 = new V3Pubkey.Builder()
+                        .streamNumber(streamNumber)
+                        .behaviorBitfield(Decode.int64(stream))
+                        .publicSigningKey(Decode.bytes(stream, 64))
+                        .publicEncryptionKey(Decode.bytes(stream, 64))
+                        .nonceTrialsPerByte(Decode.varInt(stream))
+                        .extraBytes(Decode.varInt(stream));
+                int sigLength = (int) Decode.varInt(stream);
+                v3.signature(Decode.bytes(stream, sigLength));
+                return v3.build();
+            case 4:
+                // TODO
+        }
+        LOG.debug("Unexpected pubkey version " + version + ", handling as generic payload object");
+        return new GenericPayload(streamNumber, Decode.bytes(stream, length));
+    }
+
+    private static ObjectPayload parseMsg(int version, long streamNumber, InputStream stream, int length) throws IOException {
+        return new Msg(streamNumber, Decode.bytes(stream, length));
+    }
+
+    private static ObjectPayload parseBroadcast(int version, long streamNumber, InputStream stream, int length) throws IOException {
+        return new Broadcast(streamNumber, Decode.bytes(stream, 32), Decode.bytes(stream, length - 32));
     }
 }

domain/src/main/java/ch/dissem/bitmessage/factory/V3MessageFactory.java

@@ -22,6 +22,8 @@ import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
 import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
 import ch.dissem.bitmessage.utils.Decode;
 import ch.dissem.bitmessage.utils.Security;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -31,6 +33,8 @@ import java.io.InputStream;
  * Creates protocol v3 network messages from {@link InputStream InputStreams}
  */
 class V3MessageFactory {
+    private Logger LOG = LoggerFactory.getLogger(V3MessageFactory.class);
+
     public NetworkMessage read(InputStream stream) throws IOException {
         if (testMagic(stream)) {
             String command = getCommand(stream);
@@ -45,9 +49,11 @@ class V3MessageFactory {
             } else {
                 throw new IOException("Checksum failed for message '" + command + "'");
             }
-        }
+        } else {
+            LOG.debug("Failed test for MAGIC bytes");
             return null;
         }
+    }
 
     private MessagePayload getPayload(String command, InputStream stream, int length) throws IOException {
         switch (command) {
@@ -64,6 +70,7 @@ class V3MessageFactory {
             case "object":
                 return parseObject(stream, length);
             default:
+                LOG.debug("Unknown command: " + command);
                 return null;
         }
     }
@@ -75,7 +82,7 @@ class V3MessageFactory {
         long version = Decode.varInt(stream);
         long streamNumber = Decode.varInt(stream);
 
-        ObjectPayload payload = Factory.getObjectPayload(objectType, version, stream, length);
+        ObjectPayload payload = Factory.getObjectPayload(objectType, version, streamNumber, stream, length);
 
         return new ObjectMessage.Builder()
                 .nonce(nonce)
@@ -109,7 +116,7 @@ class V3MessageFactory {
         long count = Decode.varInt(stream);
         Addr.Builder builder = new Addr.Builder();
         for (int i = 0; i < count; i++) {
-            builder.addAddress(parseAddress(stream));
+            builder.addAddress(parseAddress(stream, false));
         }
         return builder.build();
     }
@@ -118,8 +125,8 @@ class V3MessageFactory {
         int version = Decode.int32(stream);
         long services = Decode.int64(stream);
         long timestamp = Decode.int64(stream);
-        NetworkAddress addrRecv = parseAddress(stream);
+        NetworkAddress addrRecv = parseAddress(stream, true);
-        NetworkAddress addrFrom = parseAddress(stream);
+        NetworkAddress addrFrom = parseAddress(stream, true);
         long nonce = Decode.int64(stream);
         String userAgent = Decode.varString(stream);
         long[] streamNumbers = Decode.varIntList(stream);
@@ -138,9 +145,16 @@ class V3MessageFactory {
         return new InventoryVector(Decode.bytes(stream, 32));
     }
 
-    private NetworkAddress parseAddress(InputStream stream) throws IOException {
+    private NetworkAddress parseAddress(InputStream stream, boolean light) throws IOException {
-        long time = Decode.int64(stream);
+        long time;
-        long streamNumber = Decode.uint32(stream); // This isn't consistent, not sure if this is correct
+        long streamNumber;
+        if (!light) {
+            time = Decode.int64(stream);
+            streamNumber = Decode.uint32(stream); // This isn't consistent, not sure if this is correct
+        } else {
+            time = 0;
+            streamNumber = 0;
+        }
         long services = Decode.int64(stream);
         byte[] ipv6 = Decode.bytes(stream, 16);
         int port = Decode.uint16(stream);
@@ -159,13 +173,21 @@ class V3MessageFactory {
 
     private String getCommand(InputStream stream) throws IOException {
         byte[] bytes = new byte[12];
-        stream.read(bytes);
+        int end = -1;
-        return new String(bytes, "ASCII");
+        for (int i = 0; i < bytes.length; i++) {
+            bytes[i] = (byte) stream.read();
+            if (end == -1) {
+                if (bytes[i] == 0) end = i;
+            } else {
+                if (bytes[i] != 0) throw new IOException("'\\0' padding expected for command");
+            }
+        }
+        return new String(bytes, 0, end, "ASCII");
     }
 
     private boolean testMagic(InputStream stream) throws IOException {
         for (byte b : NetworkMessage.MAGIC_BYTES) {
-            if (b != stream.read()) return false;
+            if (b != (byte) stream.read()) return false;
         }
         return true;
     }

domain/src/main/java/ch/dissem/bitmessage/ports/Inventory.java

@@ -17,7 +17,6 @@
 package ch.dissem.bitmessage.ports;
 
 import ch.dissem.bitmessage.entity.ObjectMessage;
-import ch.dissem.bitmessage.entity.payload.ObjectPayload;
 import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
 
 import java.util.List;
@@ -26,13 +25,13 @@ import java.util.List;
  * The Inventory stores and retrieves objects, cleans up outdated objects and can tell which objects are still missing.
  */
 public interface Inventory {
-    public List<InventoryVector> getInventory(long... streams);
+    List<InventoryVector> getInventory(long... streams);
 
-    public List<InventoryVector> getMissing(List<InventoryVector> offer);
+    List<InventoryVector> getMissing(List<InventoryVector> offer);
 
-    public ObjectMessage getObject(InventoryVector vector);
+    ObjectMessage getObject(InventoryVector vector);
 
-    public void storeObject(ObjectMessage object);
+    void storeObject(ObjectMessage object);
 
-    public void cleanup();
+    void cleanup();
 }

domain/src/main/java/ch/dissem/bitmessage/ports/NetworkHandler.java

@@ -17,11 +17,18 @@
 package ch.dissem.bitmessage.ports;
 
 import ch.dissem.bitmessage.entity.payload.ObjectPayload;
-import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
 
 /**
- * Sends messages
+ * Handles incoming messages
  */
-public interface NetworkMessageSender {
+public interface NetworkHandler {
-    void send(NetworkAddress node, ObjectPayload payload);
+    void setListener(MessageListener listener);
+
+    void start();
+
+    void send(ObjectPayload payload);
+
+    interface MessageListener {
+        void receive(ObjectPayload payload);
+    }
 }

domain/src/main/java/ch/dissem/bitmessage/utils/Decode.java

@@ -27,7 +27,10 @@ import java.nio.ByteBuffer;
 public class Decode {
     public static byte[] bytes(InputStream stream, int count) throws IOException {
         byte[] result = new byte[count];
-        stream.read(result);
+        int off = 0;
+        while (off < count) {
+            off += stream.read(result, off, count - off);
+        }
         return result;
     }
 

inventory/build.gradle

@@ -0,0 +1,13 @@
+apply plugin: 'java'
+
+sourceCompatibility = 1.7
+version = '1.0'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile project(':domain')
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+}

inventory/src/main/java/ch/dissem/bitmessage/inventory/SimpleAddressRepository.java

@@ -14,23 +14,24 @@
  * limitations under the License.
  */
 
-package ch.dissem.bitmessage.ports;
+package ch.dissem.bitmessage.inventory;
 
-import ch.dissem.bitmessage.entity.NetworkMessage;
-import ch.dissem.bitmessage.entity.payload.ObjectPayload;
 import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
+import ch.dissem.bitmessage.ports.AddressRepository;
 
-import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
 
 /**
- * Handles incoming messages
+ * Created by chris on 06.04.15.
  */
-public interface NetworkMessageReceiver {
+public class SimpleAddressRepository implements AddressRepository {
-    void registerListener(int port, MessageListener listener) throws IOException;
+    @Override
+    public List<NetworkAddress> getKnownAddresses(int limit, long... streams) {
+        return Collections.singletonList(new NetworkAddress.Builder().ipv4(127, 0, 0, 1).port(8444).build());
+    }
 
-    void registerListener(NetworkAddress node, MessageListener listener) throws IOException;
+    @Override
-
+    public void offerAddresses(List<NetworkAddress> addresses) {
-    interface MessageListener {
-        void receive(ObjectPayload payload);
     }
 }

inventory/src/main/java/ch/dissem/bitmessage/inventory/SimpleInventory.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2015 Christian Basler
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.dissem.bitmessage.inventory;
+
+import ch.dissem.bitmessage.entity.ObjectMessage;
+import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
+import ch.dissem.bitmessage.ports.Inventory;
+import sun.reflect.generics.reflectiveObjects.NotImplementedException;
+
+import java.util.LinkedList;
+import java.util.List;
+
+/**
+ * Created by chris on 06.04.15.
+ */
+public class SimpleInventory implements Inventory {
+    @Override
+    public List<InventoryVector> getInventory(long... streams) {
+        return new LinkedList<>();
+    }
+
+    @Override
+    public List<InventoryVector> getMissing(List<InventoryVector> offer) {
+        return offer;
+    }
+
+    @Override
+    public ObjectMessage getObject(InventoryVector vector) {
+        throw new NotImplementedException();
+    }
+
+    @Override
+    public void storeObject(ObjectMessage object) {
+        throw new NotImplementedException();
+    }
+
+    @Override
+    public void cleanup() {
+        throw new NotImplementedException();
+    }
+}

networking/build.gradle

@@ -8,7 +8,7 @@ repositories {
 }
 
 dependencies {
-    compile ':domain'
+    compile project(':domain')
     compile 'com.google.guava:guava-concurrent:r03'
     testCompile 'org.slf4j:slf4j-simple:1.7.12'
     testCompile 'junit:junit:4.11'

networking/src/main/java/ch/dissem/bitmessage/networking/Connection.java

@@ -21,7 +21,7 @@ import ch.dissem.bitmessage.entity.*;
 import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
 import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
 import ch.dissem.bitmessage.factory.Factory;
-import ch.dissem.bitmessage.ports.NetworkMessageReceiver.MessageListener;
+import ch.dissem.bitmessage.ports.NetworkHandler.MessageListener;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -69,6 +69,14 @@ public class Connection implements Runnable {
         this.node = new NetworkAddress.Builder().ip(socket.getInetAddress()).port(socket.getPort()).build();
     }
 
+    public State getState() {
+        return state;
+    }
+
+    public NetworkAddress getNode() {
+        return node;
+    }
+
     @Override
     public void run() {
         if (state == CLIENT) {
@@ -77,6 +85,8 @@ public class Connection implements Runnable {
         while (state != DISCONNECTED) {
             try {
                 NetworkMessage msg = Factory.getNetworkMessage(version, in);
+                if (msg == null)
+                    continue;
                 switch (state) {
                     case ACTIVE:
                         receiveMessage(msg.getPayload());
@@ -90,20 +100,16 @@ public class Connection implements Runnable {
                                     this.version = payload.getVersion();
                                     this.streams = payload.getStreams();
                                     send(new VerAck());
-                                    if (state == SERVER) {
                                     state = ACTIVE;
-                                    }
+                                    sendAddresses();
+                                    sendInventory();
                                 } else {
+                                    LOG.info("Received unsupported version " + payload.getVersion() + ", disconnecting.");
                                     disconnect();
                                 }
                                 break;
                             case VERACK:
-                                if (state == CLIENT) {
+                                if (state == SERVER) {
-                                    sendAddresses();
-                                    sendInventory();
-
-                                    state = ACTIVE;
-                                } else {
                                     send(new Version.Builder().defaults().addrFrom(host).addrRecv(node).build());
                                 }
                                 break;
@@ -155,7 +161,7 @@ public class Connection implements Runnable {
 
     private void sendAddresses() {
         List<NetworkAddress> addresses = ctx.getAddressRepository().getKnownAddresses(1000, streams);
-        send(new Addr.Builder().addresses(addresses).build());
+        sendingQueue.offer(new Addr.Builder().addresses(addresses).build());
     }
 
     private void sendInventory() {

networking/src/main/java/ch/dissem/bitmessage/networking/NetworkNode.java

@@ -16,86 +16,113 @@
 
 package ch.dissem.bitmessage.networking;
 
-import ch.dissem.bitmessage.entity.NetworkMessage;
+import ch.dissem.bitmessage.Context;
-import ch.dissem.bitmessage.entity.Version;
+import ch.dissem.bitmessage.entity.payload.ObjectPayload;
 import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
-import ch.dissem.bitmessage.factory.Factory;
+import ch.dissem.bitmessage.ports.NetworkHandler;
-import ch.dissem.bitmessage.ports.NetworkMessageReceiver;
-import ch.dissem.bitmessage.ports.NetworkMessageSender;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
-import static ch.dissem.bitmessage.networking.Connection.State.CLIENT;
+import static ch.dissem.bitmessage.networking.Connection.State.*;
-import static ch.dissem.bitmessage.networking.Connection.State.SERVER;
 
 /**
  * Handles all the networky stuff.
  */
-public class NetworkNode implements NetworkMessageSender, NetworkMessageReceiver {
+public class NetworkNode implements NetworkHandler {
     private final static Logger LOG = LoggerFactory.getLogger(NetworkNode.class);
-    /**
-     * This is only to be used where it's ignored
-     */
-    private final static NetworkAddress LOCALHOST = new NetworkAddress.Builder().ipv4(127, 0, 0, 1).port(8444).build();
     private final ExecutorService pool;
+    private final List<Connection> connections = new LinkedList<>();
+    private MessageListener listener;
 
     public NetworkNode() {
         pool = Executors.newCachedThreadPool();
-
-        // TODO: sending
-//        Thread sender = new Thread(new Runnable() {
-//            @Override
-//            public void run() {
-//                while (true) {
-//                    try {
-//                        NetworkMessage message = sendingQueue.take();
-//
-//                        try (Socket socket = getSocket(message.getTargetNode())) {
-//                            message.write(socket.getOutputStream());
-//                        } catch (Exception e) {
-//                            e.printStackTrace();
-//                        }
-//                    } catch (InterruptedException e) {
-//                        // Ignore?
-//                    }
-//                }
-//            }
-//        }, "Sender");
-//        sender.setDaemon(true);
-//        sender.start();
     }
 
     @Override
-    public void registerListener(final int port, final MessageListener listener) throws IOException {
+    public void setListener(final MessageListener listener) {
-        final ServerSocket serverSocket = new ServerSocket(port);
+        if (this.listener != null) {
+            throw new IllegalStateException("Listener can only be set once");
+        }
+        this.listener = listener;
+    }
+
+    @Override
+    public void start() {
+        final Context ctx = Context.getInstance();
+        if (listener == null) {
+            throw new IllegalStateException("Listener must be set at start");
+        }
+        try {
+            final ServerSocket serverSocket = new ServerSocket(Context.getInstance().getPort());
             pool.execute(new Runnable() {
                 @Override
                 public void run() {
-                NetworkAddress address = null;
                     try {
                         Socket socket = serverSocket.accept();
                         socket.setSoTimeout(20000);
-                    pool.execute(new Connection(SERVER, socket, listener));
+                        startConnection(new Connection(SERVER, socket, listener));
                     } catch (IOException e) {
                         LOG.debug(e.getMessage(), e);
                     }
                 }
             });
+            Thread connectionManager = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    while (!Thread.interrupted()) {
+                        synchronized (connections) {
+                            for (Iterator<Connection> iterator = connections.iterator(); iterator.hasNext(); ) {
+                                Connection c = iterator.next();
+                                if (c.getState() == DISCONNECTED) {
+                                    // Remove the current element from the iterator and the list.
+                                    iterator.remove();
+                                }
+                            }
+                        }
+                        if (connections.size() < 1) {
+                            List<NetworkAddress> addresses = ctx.getAddressRepository().getKnownAddresses(8, ctx.getStreams());
+                            for (NetworkAddress address : addresses) {
+                                try {
+                                    startConnection(new Connection(CLIENT, new Socket(address.toInetAddress(), address.getPort()), listener));
+                                } catch (IOException e) {
+                                    LOG.debug(e.getMessage(), e);
+                                }
+                            }
+                            // FIXME: prevent connecting twice to the same node
+                        }
+                        try {
+                            Thread.sleep(30000);
+                        } catch (InterruptedException e) {
+                            LOG.debug(e.getMessage(), e);
+                            Thread.currentThread().interrupt();
+                        }
+                    }
+                }
+            }, "connection-manager");
+            connectionManager.start();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private void startConnection(Connection c) {
+        synchronized (connections) {
+            connections.add(c);
+        }
+        pool.execute(c);
     }
 
     @Override
-    public void registerListener(final NetworkAddress node, final MessageListener listener) throws IOException {
+    public void send(final ObjectPayload payload) {
-        pool.execute(new Connection(CLIENT, new Socket(node.toInetAddress(), node.getPort()), listener));
-    }
-
-    @Override
-    public void send(final NetworkAddress node, final NetworkMessage message) {
         // TODO: sendingQueue.add(message);
     }
 }

networking/src/test/java/ch/dissem/bitmessage/networking/NetworkNodeTest.java

@@ -20,7 +20,7 @@ import ch.dissem.bitmessage.entity.NetworkMessage;
 import ch.dissem.bitmessage.entity.Version;
 import ch.dissem.bitmessage.entity.payload.ObjectPayload;
 import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
-import ch.dissem.bitmessage.ports.NetworkMessageReceiver;
+import ch.dissem.bitmessage.ports.NetworkHandler;
 import org.junit.Test;
 
 /**
@@ -33,13 +33,13 @@ public class NetworkNodeTest {
     public void testSendMessage() throws Exception {
         final Thread baseThread = Thread.currentThread();
         NetworkNode net = new NetworkNode();
-        net.registerListener(localhost, new NetworkMessageReceiver.MessageListener() {
+//        net.setListener(localhost, new NetworkHandler.MessageListener() {
-            @Override
+//            @Override
-            public void receive(ObjectPayload payload) {
+//            public void receive(ObjectPayload payload) {
-                System.out.println(payload);
+//                System.out.println(payload);
-                baseThread.interrupt();
+//                baseThread.interrupt();
-            }
+//            }
-        });
+//        });
         NetworkMessage ver = new NetworkMessage(
                 new Version.Builder()
                         .version(3)
@@ -52,7 +52,7 @@ public class NetworkNodeTest {
                         .streams(1, 2)
                         .build()
         );
-        net.send(localhost, ver);
+//        net.send(localhost, ver);
         Thread.sleep(20000);
     }
 }

settings.gradle

@@ -4,3 +4,7 @@ include 'domain'
 
 include 'networking'
 
+include 'inventory'
+
+include 'demo'
+