AmazonEc2InstanceDataPropertySourceAwsTest.java

/*
 * Copyright 2013-2014 the original author or 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
 *
 *      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 org.springframework.cloud.aws.core.env.ec2;

import com.amazonaws.SDKGlobalConfiguration;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.aws.context.support.env.AwsCloudEnvironmentCheckUtils;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.SocketUtils;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.net.InetSocketAddress;

import static org.junit.Assert.assertNotNull;

/**
 * @author Agim Emruli
 */

@RunWith(SpringJUnit4ClassRunner.class)
public abstract class AmazonEc2InstanceDataPropertySourceAwsTest {

    private static final int HTTP_SERVER_TEST_PORT = SocketUtils.findAvailableTcpPort();

    @Autowired
    private SimpleConfigurationBean simpleConfigurationBean;

    @SuppressWarnings("StaticNonFinalField")
    private static HttpServer httpServer;

    @BeforeClass
    public static void setupHttpServer() throws Exception {
        InetSocketAddress address = new InetSocketAddress(HTTP_SERVER_TEST_PORT);
        httpServer = HttpServer.create(address, -1);
        httpServer.createContext("/latest/user-data", new StringWritingHttpHandler("key1:value1;key2:value2;key3:value3".getBytes()));
        httpServer.createContext("/latest/meta-data/instance-id", new StringWritingHttpHandler("i123456".getBytes()));
        httpServer.start();
        overwriteMetadataEndpointUrl("http://" + address.getHostName() + ":" + address.getPort());
        restContextInstanceDataCondition();
    }

    @AfterClass
    public static void shutdownHttpServer() throws Exception {
        if (httpServer != null) {
            httpServer.stop(10);
        }
        resetMetadataEndpointUrlOverwrite();
    }

    private static void overwriteMetadataEndpointUrl(String localMetadataServiceEndpointUrl) {
        System.setProperty(SDKGlobalConfiguration.EC2_METADATA_SERVICE_OVERRIDE_SYSTEM_PROPERTY, localMetadataServiceEndpointUrl);
    }

    private static void resetMetadataEndpointUrlOverwrite() {
        System.clearProperty(SDKGlobalConfiguration.EC2_METADATA_SERVICE_OVERRIDE_SYSTEM_PROPERTY);
    }

    @Test
    public void testInstanceDataResolution() throws Exception {
        Assert.assertEquals("value1", this.simpleConfigurationBean.getValue1());
        Assert.assertEquals("value2", this.simpleConfigurationBean.getValue2());
        Assert.assertEquals("value3", this.simpleConfigurationBean.getValue3());
        Assert.assertEquals("i123456", this.simpleConfigurationBean.getValue4());
    }

    private static class StringWritingHttpHandler implements HttpHandler {

        private final byte[] content;

        private StringWritingHttpHandler(byte[] content) {
            this.content = content;
        }

        @Override
        public void handle(HttpExchange httpExchange) throws IOException {
            httpExchange.sendResponseHeaders(200, this.content.length);
            OutputStream responseBody = httpExchange.getResponseBody();
            responseBody.write(this.content);
            responseBody.flush();
            responseBody.close();
        }
    }

    private static void restContextInstanceDataCondition() throws IllegalAccessException {
        Field field = ReflectionUtils.findField(AwsCloudEnvironmentCheckUtils.class, "isCloudEnvironment");
        assertNotNull(field);
        ReflectionUtils.makeAccessible(field);
        field.set(null, null);
    }
}