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Kafka on Pulsar implemented using Pulsar Protocol Handler

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/**
 * 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
 *
 *     http://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.streamnative.pulsar.handlers.kop.migration;

import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.util.CharsetUtil;
import io.streamnative.pulsar.handlers.kop.http.HttpHandler;
import io.streamnative.pulsar.handlers.kop.schemaregistry.HttpRequestProcessor;
import lombok.extern.slf4j.Slf4j;

/**
 * Handler for the KoP migration service.
 */
@Slf4j
@ChannelHandler.Sharable
public class MigrationHandler extends HttpHandler {

    @Override
    protected FullHttpResponse getNotFoundResponse(FullHttpRequest request, ChannelHandlerContext ctx) {
        String body = "{\n" + "  \"message\" : \"Not found\",\n" + "  \"error_code\" : 404\n" + "}";
        FullHttpResponse httpResponse =
                new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND, Unpooled.copiedBuffer(body, CharsetUtil.UTF_8));
        httpResponse.headers().set(HttpHeaderNames.CONTENT_TYPE, "application/vnd.schemaregistry.v1+json");
        httpResponse.headers().set(HttpHeaderNames.CONTENT_LENGTH, body.length());
        HttpRequestProcessor.addCORSHeaders(httpResponse);
        log.info("not found {} {} from {}", request.method(), request.uri(), ctx.channel().localAddress());
        if (log.isDebugEnabled()) {
            log.debug("SchemaRegistry at {} request {} response {}", ctx.channel().localAddress(), request,
                    httpResponse);
        }
        return httpResponse;
    }

    @Override
    protected String getName() {
        return "MigrationHandler";
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        log.error("Unhandled error, closing connection to {}", ctx.channel(), cause);
        ctx.close();
    }
}