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/*
* This file is part of spark.
*
* Copyright (c) lucko (Luck) <luck@lucko.me>
* Copyright (c) contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package me.lucko.spark.common.legacy;
import com.google.common.collect.ImmutableList;
import com.neovisionaries.ws.client.*;
import me.lucko.bytesocks.client.BytesocksClient;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.reflect.Method;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.CompletableFuture;
/**
* Implementation of BytesocksClient that works on Java 8.
*/
public class LegacyBytesocksClient implements BytesocksClient {
/* The bytesocks urls */
private final String httpUrl;
private final String wsUrl;
/** The client user agent */
private final String userAgent;
LegacyBytesocksClient(String host, String userAgent) {
this.httpUrl = "https://" + host + "/";
this.wsUrl = "wss://" + host + "/";
this.userAgent = userAgent;
}
@Override
public BytesocksClient.Socket createAndConnect(BytesocksClient.Listener listener) throws Exception {
HttpURLConnection con = (HttpURLConnection) new URL(this.httpUrl + "create").openConnection();
con.setRequestMethod("GET");
con.setRequestProperty("User-Agent", this.userAgent);
if (con.getResponseCode() != 201) {
throw new RuntimeException("Request failed");
}
String channelId = null;
for(Map.Entry<String, List<String>> entry : con.getHeaderFields().entrySet()) {
String key = entry.getKey();
List<String> value = entry.getValue();
if(key != null && key.equalsIgnoreCase("Location") && value != null && value.size() > 0) {
channelId = value.get(0);
if(channelId != null)
break;
}
}
if(channelId == null) {
throw new RuntimeException("Location header not returned");
}
return connect(channelId, listener);
}
@Override
public BytesocksClient.Socket connect(String channelId, BytesocksClient.Listener listener) throws Exception {
WebSocketFactory factory = new WebSocketFactory()
.setConnectionTimeout(5000);
WebSocket socket = factory.createSocket(URI.create(this.wsUrl + channelId))
.addHeader("User-Agent", this.userAgent)
.addListener(new ListenerImpl(listener))
.connect();
return new SocketImpl(channelId, socket);
}
private static final class SocketImpl implements BytesocksClient.Socket {
private final String id;
private final WebSocket ws;
private final WeakHashMap<WebSocketFrame, CompletableFuture<?>> frameFutures = new WeakHashMap<>();
/* ugly hacks to track sending of websocket */
private static final MethodHandle SPLIT_METHOD;
static {
try {
Method m = WebSocket.class.getDeclaredMethod("splitIfNecessary", WebSocketFrame.class);
m.setAccessible(true);
SPLIT_METHOD = MethodHandles.lookup().unreflect(m);
} catch(ReflectiveOperationException e) {
throw new RuntimeException(e);
}
}
private SocketImpl(String id, WebSocket ws) {
this.id = id;
this.ws = ws;
this.ws.addListener(new WebSocketAdapter() {
@Override
public void onFrameSent(WebSocket websocket, WebSocketFrame frame) throws Exception {
synchronized (frameFutures) {
CompletableFuture<?> future = frameFutures.remove(frame);
if(future != null)
future.complete(null);
else {
System.err.println("Sent frame without associated CompletableFuture");
}
}
}
@Override
public void onFrameUnsent(WebSocket websocket, WebSocketFrame frame) throws Exception {
synchronized (frameFutures) {
CompletableFuture<?> future = frameFutures.remove(frame);
if(future != null)
future.completeExceptionally(new Exception("Failed to send frame"));
else
System.err.println("Received error without associated CompletableFuture");
}
}
});
}
@Override
public String getChannelId() {
return this.id;
}
@Override
public boolean isOpen() {
return this.ws.isOpen();
}
@Override
public CompletableFuture<?> send(CharSequence msg) {
WebSocketFrame targetFrame = WebSocketFrame.createTextFrame(msg.toString());
// split ourselves so we know what the last frame was
List<WebSocketFrame> splitFrames;
try {
splitFrames = (List<WebSocketFrame>)SPLIT_METHOD.invokeExact(this.ws, targetFrame);
} catch(Throwable e) {
throw new RuntimeException(e);
}
if(splitFrames == null)
splitFrames = ImmutableList.of(targetFrame);
// FIXME this code is not really that efficient (allocating a whole new CompletableFuture for every frame), but
// it's the simplest solution for now and seems to be good enough. We have to track all frames to correctly
// report errors/success
List<CompletableFuture<?>> futures = new ArrayList<>();
for(WebSocketFrame frame : splitFrames) {
CompletableFuture<?> future = new CompletableFuture<>();
synchronized (frameFutures) {
frameFutures.put(frame, future);
}
futures.add(future);
this.ws.sendFrame(frame);
}
return CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]));
}
@Override
public void close(int statusCode, String reason) {
this.ws.sendClose(statusCode, reason);
}
}
private static final class ListenerImpl extends WebSocketAdapter {
private final Listener listener;
private ListenerImpl(Listener listener) {
this.listener = listener;
}
@Override
public void onConnected(WebSocket websocket, Map<String, List<String>> headers) throws Exception {
this.listener.onOpen();
}
@Override
public void onDisconnected(WebSocket websocket, WebSocketFrame serverCloseFrame, WebSocketFrame clientCloseFrame, boolean closedByServer) throws Exception {
this.listener.onClose(serverCloseFrame.getCloseCode(), serverCloseFrame.getCloseReason());
}
@Override
public void onError(WebSocket websocket, WebSocketException cause) throws Exception {
this.listener.onError(cause);
}
@Override
public void onTextMessage(WebSocket websocket, String text) throws Exception {
this.listener.onText(text);
}
}
}
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