85 lines
3.1 KiB
Java
85 lines
3.1 KiB
Java
/*
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* Copyright 2019 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.http.websocketx;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPromise;
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import io.netty.util.ReferenceCountUtil;
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import io.netty.util.concurrent.ScheduledFuture;
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import java.nio.channels.ClosedChannelException;
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import java.util.Objects;
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import java.util.concurrent.TimeUnit;
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/**
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* Send {@link CloseWebSocketFrame} message on channel close, if close frame was not sent before.
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*/
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final class WebSocketCloseFrameHandler implements ChannelHandler {
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private final WebSocketCloseStatus closeStatus;
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private final long forceCloseTimeoutMillis;
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private ChannelPromise closeSent;
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WebSocketCloseFrameHandler(WebSocketCloseStatus closeStatus, long forceCloseTimeoutMillis) {
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this.closeStatus = Objects.requireNonNull(closeStatus, "closeStatus");
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this.forceCloseTimeoutMillis = forceCloseTimeoutMillis;
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}
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@Override
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public void close(final ChannelHandlerContext ctx, final ChannelPromise promise) throws Exception {
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if (!ctx.channel().isActive()) {
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ctx.close(promise);
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return;
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}
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if (closeSent == null) {
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write(ctx, new CloseWebSocketFrame(closeStatus), ctx.newPromise());
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}
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flush(ctx);
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applyCloseSentTimeout(ctx);
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closeSent.addListener((ChannelFutureListener) future -> ctx.close(promise));
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}
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@Override
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public void write(final ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
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if (closeSent != null) {
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ReferenceCountUtil.release(msg);
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promise.setFailure(new ClosedChannelException());
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return;
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}
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if (msg instanceof CloseWebSocketFrame) {
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promise = promise.unvoid();
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closeSent = promise;
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}
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ctx.write(msg, promise);
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}
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private void applyCloseSentTimeout(ChannelHandlerContext ctx) {
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if (closeSent.isDone() || forceCloseTimeoutMillis < 0) {
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return;
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}
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final ScheduledFuture<?> timeoutTask = ctx.executor().schedule(() -> {
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if (!closeSent.isDone()) {
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closeSent.tryFailure(new WebSocketHandshakeException("send close frame timed out"));
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}
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}, forceCloseTimeoutMillis, TimeUnit.MILLISECONDS);
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closeSent.addListener((ChannelFutureListener) future -> timeoutTask.cancel(false));
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}
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}
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