/**
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.apache.hadoop.gateway.rm.dispatch;
import org.apache.hadoop.gateway.ha.provider.HaDescriptor;
import org.apache.hadoop.gateway.ha.provider.HaProvider;
import org.apache.hadoop.gateway.ha.provider.HaServletContextListener;
import org.apache.hadoop.gateway.ha.provider.impl.DefaultHaProvider;
import org.apache.hadoop.gateway.ha.provider.impl.HaDescriptorFactory;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.Header;
import org.apache.http.message.BasicHttpResponse;
import org.apache.http.ProtocolVersion;
import org.apache.http.StatusLine;
import org.apache.http.message.BasicStatusLine;
import org.apache.http.message.BasicHeader;
import org.easymock.EasyMock;
import org.easymock.IAnswer;
import org.junit.Assert;
import org.junit.Test;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.WriteListener;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicInteger;
public class RMHaDispatchTest {
private static final String LOCATION = "Location";
@Test
public void testConnectivityFailure() throws Exception {
String serviceName = "RESOURCEMANAGER";
HaDescriptor descriptor = HaDescriptorFactory.createDescriptor();
descriptor.addServiceConfig(HaDescriptorFactory.createServiceConfig(serviceName, "true", "1", "1000", "2", "1000", null, null));
HaProvider provider = new DefaultHaProvider(descriptor);
URI uri1 = new URI("http://unreachable-host");
URI uri2 = new URI("http://reachable-host");
ArrayList<String> urlList = new ArrayList<>();
urlList.add(uri1.toString());
urlList.add(uri2.toString());
provider.addHaService(serviceName, urlList);
FilterConfig filterConfig = EasyMock.createNiceMock(FilterConfig.class);
ServletContext servletContext = EasyMock.createNiceMock(ServletContext.class);
EasyMock.expect(filterConfig.getServletContext()).andReturn(servletContext).anyTimes();
EasyMock.expect(servletContext.getAttribute(HaServletContextListener.PROVIDER_ATTRIBUTE_NAME)).andReturn(provider).anyTimes();
BasicHttpParams params = new BasicHttpParams();
HttpUriRequest outboundRequest = EasyMock.createNiceMock(HttpRequestBase.class);
EasyMock.expect(outboundRequest.getMethod()).andReturn("GET").anyTimes();
EasyMock.expect(outboundRequest.getURI()).andReturn(uri1).anyTimes();
EasyMock.expect(outboundRequest.getParams()).andReturn(params).anyTimes();
HttpServletRequest inboundRequest = EasyMock.createNiceMock(HttpServletRequest.class);
EasyMock.expect(inboundRequest.getRequestURL()).andReturn(new StringBuffer(uri2.toString())).once();
EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(0)).once();
EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(1)).once();
HttpServletResponse outboundResponse = EasyMock.createNiceMock(HttpServletResponse.class);
EasyMock.expect(outboundResponse.getOutputStream()).andAnswer(new IAnswer<ServletOutputStream>() {
@Override
public ServletOutputStream answer() throws Throwable {
return new ServletOutputStream() {
@Override
public void write(int b) throws IOException {
throw new IOException("unreachable-host");
}
@Override
public void setWriteListener(WriteListener arg0) {
}
@Override
public boolean isReady() {
return false;
}
};
}
}).once();
EasyMock.replay(filterConfig, servletContext, outboundRequest, inboundRequest, outboundResponse);
Assert.assertEquals(uri1.toString(), provider.getActiveURL(serviceName));
RMHaDispatch dispatch = new RMHaDispatch();
dispatch.setHttpClient(new DefaultHttpClient());
dispatch.setHaProvider(provider);
dispatch.init();
long startTime = System.currentTimeMillis();
try {
dispatch.executeRequest(outboundRequest, inboundRequest, outboundResponse);
} catch (IOException e) {
//this is expected after the failover limit is reached
}
long elapsedTime = System.currentTimeMillis() - startTime;
Assert.assertEquals(uri2.toString(), provider.getActiveURL(serviceName));
//test to make sure the sleep took place
Assert.assertTrue(elapsedTime > 1000);
}
@Test
public void testConnectivityFailover() throws Exception {
String serviceName = "RESOURCEMANAGER";
HaDescriptor descriptor = HaDescriptorFactory.createDescriptor();
descriptor.addServiceConfig(HaDescriptorFactory.createServiceConfig(serviceName, "true", "1", "1000", "2", "1000", null, null));
HaProvider provider = new DefaultHaProvider(descriptor);
URI uri1 = new URI("http://passive-host");
URI uri2 = new URI("http://other-host");
URI uri3 = new URI("http://active-host");
ArrayList<String> urlList = new ArrayList<>();
urlList.add(uri1.toString());
urlList.add(uri2.toString());
urlList.add(uri3.toString());
provider.addHaService(serviceName, urlList);
FilterConfig filterConfig = EasyMock.createNiceMock(FilterConfig.class);
ServletContext servletContext = EasyMock.createNiceMock(ServletContext.class);
EasyMock.expect(filterConfig.getServletContext()).andReturn(servletContext).anyTimes();
EasyMock.expect(servletContext.getAttribute(HaServletContextListener.PROVIDER_ATTRIBUTE_NAME)).andReturn(provider).anyTimes();
BasicHttpResponse inboundResponse = EasyMock.createNiceMock(BasicHttpResponse.class);
EasyMock.expect(inboundResponse.getStatusLine()).andReturn(getStatusLine()).anyTimes();
EasyMock.expect(inboundResponse.getEntity()).andReturn(getResponseEntity()).anyTimes();
EasyMock.expect(inboundResponse.getFirstHeader(LOCATION)).andReturn(getFirstHeader(uri3.toString())).anyTimes();
BasicHttpParams params = new BasicHttpParams();
HttpUriRequest outboundRequest = EasyMock.createNiceMock(HttpRequestBase.class);
EasyMock.expect(outboundRequest.getMethod()).andReturn("GET").anyTimes();
EasyMock.expect(outboundRequest.getURI()).andReturn(uri1).anyTimes();
EasyMock.expect(outboundRequest.getParams()).andReturn(params).anyTimes();
HttpServletRequest inboundRequest = EasyMock.createNiceMock(HttpServletRequest.class);
EasyMock.expect(inboundRequest.getRequestURL()).andReturn(new StringBuffer(uri2.toString())).once();
EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(0)).once();
EasyMock.expect(inboundRequest.getAttribute("dispatch.ha.failover.counter")).andReturn(new AtomicInteger(1)).once();
HttpServletResponse outboundResponse = EasyMock.createNiceMock(HttpServletResponse.class);
EasyMock.expect(outboundResponse.getOutputStream()).andAnswer(new IAnswer<ServletOutputStream>() {
@Override
public ServletOutputStream answer() throws Throwable {
return new ServletOutputStream() {
@Override
public void write(int b) throws IOException {
throw new IOException("unreachable-host");
}
@Override
public void setWriteListener(WriteListener arg0) {
}
@Override
public boolean isReady() {
return false;
}
};
}
}).once();
Assert.assertEquals(uri1.toString(), provider.getActiveURL(serviceName));
EasyMock.replay(filterConfig, servletContext, inboundResponse, outboundRequest, inboundRequest, outboundResponse);
RMHaDispatch dispatch = new RMHaDispatch();
dispatch.setHttpClient(new DefaultHttpClient());
dispatch.setHaProvider(provider);
dispatch.init();
long startTime = System.currentTimeMillis();
try {
dispatch.setInboundResponse(inboundResponse);
dispatch.executeRequest(outboundRequest, inboundRequest, outboundResponse);
} catch (IOException e) {
//this is expected after the failover limit is reached
}
Assert.assertEquals(uri3.toString(), dispatch.getUriFromInbound(inboundRequest, inboundResponse, null).toString());
long elapsedTime = System.currentTimeMillis() - startTime;
Assert.assertEquals(uri3.toString(), provider.getActiveURL(serviceName));
//test to make sure the sleep took place
Assert.assertTrue(elapsedTime > 1000);
}
private StringEntity getResponseEntity() {
String body = "This is standby RM";
return new StringEntity(body, ContentType.TEXT_HTML);
}
private StatusLine getStatusLine() {
ProtocolVersion p = new ProtocolVersion("HTTP", 1, 1);
return new BasicStatusLine(p, 307, "Code" + 307);
}
private Header getFirstHeader(String host) {
return new BasicHeader(LOCATION, host);
}
}