clients/src/test/java/org/apache/kafka/common/requests/RequestContextTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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,
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 * See the License for the specific language governing permissions and
 * limitations under the License.
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package org.apache.kafka.common.requests;

import org.apache.kafka.common.network.ListenerName;
import org.apache.kafka.common.network.Send;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.security.auth.SecurityProtocol;
import org.apache.kafka.common.protocol.types.Struct;
import org.apache.kafka.common.security.auth.KafkaPrincipal;
import org.junit.Test;

import java.net.InetAddress;
import java.nio.ByteBuffer;
import java.util.Collections;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

public class RequestContextTest {

    @Test
    public void testSerdeUnsupportedApiVersionRequest() throws Exception {
        int correlationId = 23423;

        RequestHeader header = new RequestHeader(ApiKeys.API_VERSIONS, Short.MAX_VALUE, "", correlationId);
        RequestContext context = new RequestContext(header, "0", InetAddress.getLocalHost(), KafkaPrincipal.ANONYMOUS,
                new ListenerName("ssl"), SecurityProtocol.SASL_SSL);
        assertEquals(0, context.apiVersion());

        // Write some garbage to the request buffer. This should be ignored since we will treat
        // the unknown version type as v0 which has an empty request body.
        ByteBuffer requestBuffer = ByteBuffer.allocate(8);
        requestBuffer.putInt(3709234);
        requestBuffer.putInt(29034);
        requestBuffer.flip();

        RequestAndSize requestAndSize = context.parseRequest(requestBuffer);
        assertTrue(requestAndSize.request instanceof ApiVersionsRequest);
        ApiVersionsRequest request = (ApiVersionsRequest) requestAndSize.request;
        assertTrue(request.hasUnsupportedRequestVersion());

        Send send = context.buildResponse(new ApiVersionsResponse(0, Errors.UNSUPPORTED_VERSION,
                Collections.<ApiVersionsResponse.ApiVersion>emptyList()));
        ByteBufferChannel channel = new ByteBufferChannel(256);
        send.writeTo(channel);

        ByteBuffer responseBuffer = channel.buffer();
        responseBuffer.flip();
        responseBuffer.getInt(); // strip off the size

        ResponseHeader responseHeader = ResponseHeader.parse(responseBuffer);
        assertEquals(correlationId, responseHeader.correlationId());

        Struct struct = ApiKeys.API_VERSIONS.parseResponse((short) 0, responseBuffer);
        ApiVersionsResponse response = (ApiVersionsResponse)
            AbstractResponse.parseResponse(ApiKeys.API_VERSIONS, struct, (short) 0);
        assertEquals(Errors.UNSUPPORTED_VERSION, response.error());
        assertTrue(response.apiVersions().isEmpty());
    }

}