io.micronaut.http.netty.websocket.WebSocketMessageEncoder Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original authors
*
* 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
*
* https://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 io.micronaut.http.netty.websocket;
import io.micronaut.buffer.netty.NettyByteBufferFactory;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.reflect.ClassUtils;
import io.micronaut.http.MediaType;
import io.micronaut.http.codec.MediaTypeCodec;
import io.micronaut.http.codec.MediaTypeCodecRegistry;
import io.micronaut.websocket.exceptions.WebSocketSessionException;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.buffer.UnpooledByteBufAllocator;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import jakarta.inject.Singleton;
import java.nio.ByteBuffer;
import java.util.Optional;
/**
* Encapsulate functionality to encode WebSocket messages.
*
* @author sdelamo
* @since 1.0
*/
@Requires(classes = WebSocketSessionException.class)
@Singleton
public class WebSocketMessageEncoder {
private final MediaTypeCodecRegistry codecRegistry;
/**
* @param codecRegistry The codec registry
*/
public WebSocketMessageEncoder(MediaTypeCodecRegistry codecRegistry) {
this.codecRegistry = codecRegistry;
}
/**
* Encode the given message with the given media type.
* @param message The message
* @param mediaType The media type
* @return The encoded frame
*/
public WebSocketFrame encodeMessage(Object message, MediaType mediaType) {
if (message instanceof byte[]) {
return new BinaryWebSocketFrame(Unpooled.wrappedBuffer((byte[]) message));
} else if (ClassUtils.isJavaLangType(message.getClass()) || message instanceof CharSequence) {
String s = message.toString();
return new TextWebSocketFrame(s);
} else if (message instanceof ByteBuf) {
return new BinaryWebSocketFrame(((ByteBuf) message).slice());
} else if (message instanceof ByteBuffer) {
return new BinaryWebSocketFrame(Unpooled.wrappedBuffer((ByteBuffer) message));
} else {
Optional codec = codecRegistry.findCodec(mediaType != null ? mediaType : MediaType.APPLICATION_JSON_TYPE);
if (codec.isPresent()) {
io.micronaut.core.io.buffer.ByteBuffer encoded = codec.get().encode(message, new NettyByteBufferFactory(UnpooledByteBufAllocator.DEFAULT));
return new TextWebSocketFrame((ByteBuf) encoded.asNativeBuffer());
}
}
throw new WebSocketSessionException("Unable to encode WebSocket message: " + message);
}
}