Merge branch 'master' into reload-command

# Conflicts:
#	proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

proxy/build.gradle

@@ -38,6 +38,7 @@ dependencies {
     compile "org.apache.logging.log4j:log4j-core:${log4jVersion}"
     compile "org.apache.logging.log4j:log4j-slf4j-impl:${log4jVersion}"
 
+    compile 'net.sf.jopt-simple:jopt-simple:5.0.4' // command-line options
     compile 'net.minecrell:terminalconsoleappender:1.1.1'
     runtime 'net.java.dev.jna:jna:4.5.2' // Needed for JLine
     runtime 'com.lmax:disruptor:3.4.2' // Async loggers

proxy/src/main/java/com/velocitypowered/proxy/ProxyOptions.java

@@ -0,0 +1,46 @@
+package com.velocitypowered.proxy;
+
+import java.io.IOException;
+import java.util.Arrays;
+import joptsimple.OptionParser;
+import joptsimple.OptionSet;
+import joptsimple.OptionSpec;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public final class ProxyOptions {
+  private static final Logger logger = LogManager.getLogger(ProxyOptions.class);
+  private final boolean help;
+  private final @Nullable Integer port;
+
+  ProxyOptions(final String[] args) {
+    final OptionParser parser = new OptionParser();
+
+    final OptionSpec<Void> help = parser.acceptsAll(Arrays.asList("h", "help"), "Print help")
+        .forHelp();
+    final OptionSpec<Integer> port = parser.acceptsAll(Arrays.asList("p", "port"),
+        "Specify the bind port to be used. The configuration bind port will be ignored.")
+        .withRequiredArg().ofType(Integer.class);
+    final OptionSet set = parser.parse(args);
+
+    this.help = set.has(help);
+    this.port = port.value(set);
+
+    if (this.help) {
+      try {
+        parser.printHelpOn(System.out);
+      } catch (final IOException e) {
+        logger.error("Could not print help", e);
+      }
+    }
+  }
+
+  boolean isHelp() {
+    return this.help;
+  }
+
+  public @Nullable Integer getPort() {
+    return this.port;
+  }
+}

proxy/src/main/java/com/velocitypowered/proxy/Velocity.java

@@ -17,7 +17,13 @@ public class Velocity {
   public static void main(String... args) {
     long startTime = System.currentTimeMillis();
 
-    VelocityServer server = new VelocityServer();
+    final ProxyOptions options = new ProxyOptions(args);
+
+    if (options.isHelp()) {
+      return;
+    }
+
+    VelocityServer server = new VelocityServer(options);
     server.start();
 
     Runtime.getRuntime().addShutdownHook(new Thread(() -> server.shutdown(false), "Shutdown thread"));

proxy/src/main/java/com/velocitypowered/proxy/VelocityServer.java

@@ -75,6 +75,8 @@ public class VelocityServer implements ProxyServer {
       .create();
 
   private ConnectionManager cm;
+  private final ProxyOptions options;
+  private @MonotonicNonNull ConnectionManager cm;
   private @MonotonicNonNull VelocityConfiguration configuration;
   private @MonotonicNonNull NettyHttpClient httpClient;
   private @MonotonicNonNull KeyPair serverKeyPair;
@@ -92,13 +94,14 @@ public class VelocityServer implements ProxyServer {
   private VelocityScheduler scheduler;
   private final VelocityChannelRegistrar channelRegistrar = new VelocityChannelRegistrar();
 
-  VelocityServer() {
+  VelocityServer(final ProxyOptions options) {
     pluginManager = new VelocityPluginManager(this);
     eventManager = new VelocityEventManager(pluginManager);
     scheduler = new VelocityScheduler(pluginManager);
     console = new VelocityConsole(this);
     cm = new ConnectionManager(this);
     servers = new ServerMap(this);
+    this.options = options;
   }
 
   public KeyPair getServerKeyPair() {
@@ -188,7 +191,13 @@ public class VelocityServer implements ProxyServer {
     // init console permissions after plugins are loaded
     console.setupPermissions();
 
-    this.cm.bind(configuration.getBind());
+    final Integer port = this.options.getPort();
+    if (port != null) {
+      logger.debug("Overriding bind port to {} from command line option", port);
+      this.cm.bind(new InetSocketAddress(configuration.getBind().getHostString(), port));
+    } else {
+      this.cm.bind(configuration.getBind());
+    }
 
     if (configuration.isQueryEnabled()) {
       this.cm.queryBind(configuration.getBind().getHostString(), configuration.getQueryPort());

proxy/src/main/java/com/velocitypowered/proxy/command/ShutdownCommand.java

@@ -17,11 +17,6 @@ public class ShutdownCommand implements Command {
 
   @Override
   public void execute(CommandSource source, String @NonNull [] args) {
-    if (source != server.getConsoleCommandSource()) {
-      source
-          .sendMessage(TextComponent.of("You are not allowed to use this command.", TextColor.RED));
-      return;
-    }
     server.shutdown(true);
   }
 

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommand.java

@@ -97,7 +97,7 @@ public class VelocityCommand implements Command {
   @Override
   public boolean hasPermission(CommandSource source, String @NonNull [] args) {
     if (args.length == 0) {
-      return true;
+      return subcommands.values().stream().anyMatch(e -> e.hasPermission(source, args));
     }
     Command command = subcommands.get(args[0].toLowerCase(Locale.US));
     if (command == null) {
@@ -151,6 +151,11 @@ public class VelocityCommand implements Command {
 
     @Override
     public void execute(CommandSource source, String @NonNull [] args) {
+      if (args.length != 0) {
+        source.sendMessage(TextComponent.of("/velocity version", TextColor.RED));
+        return;
+      }
+
       ProxyVersion version = server.getVersion();
 
       TextComponent velocity = TextComponent.builder(version.getName() + " ")

proxy/src/main/java/com/velocitypowered/proxy/command/VelocityCommandManager.java

@@ -23,7 +23,7 @@ public class VelocityCommandManager implements CommandManager {
     Preconditions.checkNotNull(command, "executor");
     for (int i = 0, length = aliases.length; i < length; i++) {
       final String alias = aliases[i];
-      Preconditions.checkNotNull(aliases, "alias at index %s", i);
+      Preconditions.checkNotNull(alias, "alias at index %s", i);
       this.commands.put(alias.toLowerCase(Locale.ENGLISH), command);
     }
   }

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BackendPlaySessionHandler.java

@@ -160,8 +160,7 @@ public class BackendPlaySessionHandler implements MinecraftSessionHandler {
   public void disconnected() {
     serverConn.getServer().removePlayer(serverConn.getPlayer());
     if (!serverConn.isGracefulDisconnect()) {
-      serverConn.getPlayer().handleConnectionException(serverConn.getServer(), Disconnect.create(
-          ConnectionMessages.UNEXPECTED_DISCONNECT));
+      serverConn.getPlayer().disconnect(ConnectionMessages.UNEXPECTED_DISCONNECT);
     }
   }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/backend/VelocityServerConnection.java

@@ -94,6 +94,9 @@ public class VelocityServerConnection implements MinecraftConnectionAssociation,
                 new LoginSessionHandler(server, VelocityServerConnection.this, result));
             startHandshake();
           } else {
+            // We need to remember to reset the in-flight connection to allow connect() to work
+            // properly.
+            proxyPlayer.resetInFlightConnection();
             result.completeExceptionally(future.cause());
           }
         });

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -286,6 +286,10 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     return connectedServer;
   }
 
+  public void resetInFlightConnection() {
+    connectionInFlight = null;
+  }
+
   public void handleConnectionException(RegisteredServer server, Throwable throwable) {
     if (throwable == null) {
       throw new NullPointerException("throwable");
@@ -481,7 +485,8 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
     private Optional<ConnectionRequestBuilder.Status> checkServer(RegisteredServer server) {
       Preconditions
           .checkState(server instanceof VelocityRegisteredServer, "Not a valid Velocity server.");
-      if (connectionInFlight != null) {
+      if (connectionInFlight != null || (connectedServer != null
+          && !connectedServer.hasCompletedJoin())) {
         return Optional.of(ConnectionRequestBuilder.Status.CONNECTION_IN_PROGRESS);
       }
       if (connectedServer != null && connectedServer.getServer().equals(server)) {
@@ -516,8 +521,12 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
               return CompletableFuture
                   .completedFuture(ConnectionRequestResults.plainResult(lastCheck.get()));
             }
-            return new VelocityServerConnection((VelocityRegisteredServer) rs,
-                ConnectedPlayer.this, server).connect();
+
+            VelocityRegisteredServer vrs = (VelocityRegisteredServer) rs;
+            VelocityServerConnection con = new VelocityServerConnection(vrs, ConnectedPlayer.this,
+                server);
+            connectionInFlight = con;
+            return con.connect();
           });
     }
 

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/GS4QueryHandler.java

@@ -264,6 +264,8 @@ public class GS4QueryHandler extends SimpleChannelInboundHandler<DatagramPacket>
         return;
       }
 
+      writeString(buf, "plugins");
+      
       StringBuilder pluginsString = new StringBuilder();
       pluginsString.append(serverVersion).append(':').append(' ');
       Iterator<QueryResponse.PluginInformation> iterator = plugins.iterator();