159 lines
5.2 KiB
Java
159 lines
5.2 KiB
Java
/*
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* Copyright 2016 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage.networking.nio;
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import ch.dissem.bitmessage.InternalContext;
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import ch.dissem.bitmessage.entity.*;
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import ch.dissem.bitmessage.entity.valueobject.InventoryVector;
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import ch.dissem.bitmessage.entity.valueobject.NetworkAddress;
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import ch.dissem.bitmessage.exception.NodeException;
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import ch.dissem.bitmessage.factory.V3MessageReader;
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import ch.dissem.bitmessage.networking.AbstractConnection;
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import ch.dissem.bitmessage.ports.NetworkHandler;
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import java.nio.ByteBuffer;
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import java.util.Iterator;
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import java.util.Queue;
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import java.util.Set;
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import static ch.dissem.bitmessage.networking.AbstractConnection.Mode.CLIENT;
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import static ch.dissem.bitmessage.networking.AbstractConnection.Mode.SYNC;
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/**
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* Represents the current state of a connection.
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*/
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public class ConnectionInfo extends AbstractConnection {
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private final ByteBuffer headerOut = ByteBuffer.allocate(24);
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private ByteBuffer payloadOut;
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private V3MessageReader reader = new V3MessageReader();
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private boolean syncFinished;
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private long lastUpdate = System.currentTimeMillis();
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public ConnectionInfo(InternalContext context, Mode mode,
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NetworkAddress node, NetworkHandler.MessageListener listener,
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Set<InventoryVector> commonRequestedObjects, long syncTimeout) {
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super(context, mode, node, listener, commonRequestedObjects, syncTimeout);
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headerOut.flip();
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if (mode == CLIENT || mode == SYNC) {
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send(new Version.Builder().defaults(ctx.getClientNonce()).addrFrom(host).addrRecv(node).build());
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}
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}
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public State getState() {
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return state;
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}
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public boolean knowsOf(InventoryVector iv) {
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return ivCache.containsKey(iv);
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}
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public Queue<MessagePayload> getSendingQueue() {
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return sendingQueue;
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}
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public ByteBuffer getInBuffer() {
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if (reader == null) {
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throw new NodeException("Node is disconnected");
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}
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return reader.getActiveBuffer();
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}
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public void updateWriter() {
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if (!headerOut.hasRemaining() && !sendingQueue.isEmpty()) {
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headerOut.clear();
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MessagePayload payload = sendingQueue.poll();
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payloadOut = new NetworkMessage(payload).writeHeaderAndGetPayloadBuffer(headerOut);
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headerOut.flip();
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lastUpdate = System.currentTimeMillis();
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}
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}
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public ByteBuffer[] getOutBuffers() {
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return new ByteBuffer[]{headerOut, payloadOut};
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}
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public void cleanupBuffers() {
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if (payloadOut != null && !payloadOut.hasRemaining()) {
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payloadOut = null;
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}
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}
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public void updateReader() {
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reader.update();
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if (!reader.getMessages().isEmpty()) {
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Iterator<NetworkMessage> iterator = reader.getMessages().iterator();
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NetworkMessage msg = null;
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while (iterator.hasNext()) {
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msg = iterator.next();
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handleMessage(msg.getPayload());
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iterator.remove();
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}
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syncFinished = syncFinished(msg);
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}
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lastUpdate = System.currentTimeMillis();
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}
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public void updateSyncStatus() {
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if (!syncFinished) {
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syncFinished = (reader == null || reader.getMessages().isEmpty()) && syncFinished(null);
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}
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}
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public boolean isExpired() {
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switch (state) {
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case CONNECTING:
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// the TCP timeout starts out at 20 seconds
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return lastUpdate < System.currentTimeMillis() - 20_000;
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case ACTIVE:
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// after verack messages are exchanged, the timeout is raised to 10 minutes
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return lastUpdate < System.currentTimeMillis() - 600_000;
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case DISCONNECTED:
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return true;
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default:
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throw new IllegalStateException("Unknown state: " + state);
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}
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}
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@Override
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public void disconnect() {
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super.disconnect();
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if (reader != null) {
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reader.cleanup();
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reader = null;
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}
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}
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public boolean isSyncFinished() {
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return syncFinished;
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}
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@Override
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protected void send(MessagePayload payload) {
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sendingQueue.add(payload);
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if (payload instanceof GetData) {
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requestedObjects.addAll(((GetData) payload).getInventory());
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commonRequestedObjects.addAll(((GetData) payload).getInventory());
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}
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}
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public boolean isWritePending() {
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return !sendingQueue.isEmpty()
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|| headerOut != null && headerOut.hasRemaining()
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|| payloadOut != null && payloadOut.hasRemaining();
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}
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}
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