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 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.elasticsearch.http.netty;

import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.http.HttpServerTransport;
import org.elasticsearch.node.Node;
import org.elasticsearch.test.ESIntegTestCase;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.junit.Test;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Locale;

import static org.elasticsearch.common.settings.Settings.settingsBuilder;
import static org.elasticsearch.http.netty.NettyHttpClient.returnOpaqueIds;
import static org.elasticsearch.test.ESIntegTestCase.ClusterScope;
import static org.elasticsearch.test.ESIntegTestCase.Scope;
import static org.hamcrest.Matchers.hasSize;
import static org.hamcrest.Matchers.is;


@ClusterScope(scope = Scope.TEST, numDataNodes = 1)
public class NettyPipeliningEnabledIT extends ESIntegTestCase {

    @Override
    protected Settings nodeSettings(int nodeOrdinal) {
        return settingsBuilder().put(super.nodeSettings(nodeOrdinal)).put(Node.HTTP_ENABLED, true).put("http.pipelining", true).build();
    }

    @Test
    public void testThatNettyHttpServerSupportsPipelining() throws Exception {
        List<String> requests = Arrays.asList("/", "/_nodes/stats", "/", "/_cluster/state", "/");

        HttpServerTransport httpServerTransport = internalCluster().getInstance(HttpServerTransport.class);
        InetSocketTransportAddress inetSocketTransportAddress = (InetSocketTransportAddress) randomFrom(httpServerTransport.boundAddress().boundAddresses());

        try (NettyHttpClient nettyHttpClient = new NettyHttpClient()) {
            Collection<HttpResponse> responses = nettyHttpClient.get(inetSocketTransportAddress.address(), requests.toArray(new String[]{}));
            assertThat(responses, hasSize(5));

            Collection<String> opaqueIds = returnOpaqueIds(responses);
            assertOpaqueIdsInOrder(opaqueIds);
        }
    }

    private void assertOpaqueIdsInOrder(Collection<String> opaqueIds) {
        // check if opaque ids are monotonically increasing
        int i = 0;
        String msg = String.format(Locale.ROOT, "Expected list of opaque ids to be monotonically increasing, got [" + opaqueIds + "]");
        for (String opaqueId : opaqueIds) {
            assertThat(msg, opaqueId, is(String.valueOf(i++)));
        }
    }

}