/*
* Copyright 2014 Netflix, Inc.
*
* 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 com.netflix.eureka;
import javax.servlet.FilterChain;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.netflix.appinfo.AbstractEurekaIdentity;
import com.netflix.appinfo.ApplicationInfoManager;
import com.netflix.appinfo.EurekaClientIdentity;
import com.netflix.appinfo.MyDataCenterInstanceConfig;
import com.netflix.config.ConfigurationManager;
import com.netflix.eureka.util.EurekaMonitors;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
/**
* @author Tomasz Bak
*/
@RunWith(MockitoJUnitRunner.class)
public class RateLimitingFilterTest {
private static final String FULL_FETCH = "base/apps";
private static final String DELTA_FETCH = "base/apps/delta";
private static final String APP_FETCH = "base/apps/myAppId";
private static final String CUSTOM_CLIENT = "CustomClient";
private static final String PYTHON_CLIENT = "PythonClient";
@Mock
private HttpServletRequest request;
@Mock
private HttpServletResponse response;
@Mock
private FilterChain filterChain;
private RateLimitingFilter filter;
@Before
public void setUp() throws Exception {
RateLimitingFilter.reset();
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.privilegedClients", PYTHON_CLIENT);
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.enabled", true);
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.burstSize", 2);
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.registryFetchAverageRate", 1);
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.fullFetchAverageRate", 1);
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.throttleStandardClients", false);
ApplicationInfoManager applicationInfoManager = new ApplicationInfoManager(new MyDataCenterInstanceConfig());
DefaultEurekaServerConfig config = new DefaultEurekaServerConfig();
EurekaServerContext mockServer = mock(EurekaServerContext.class);
when(mockServer.getServerConfig()).thenReturn(config);
filter = new RateLimitingFilter(mockServer);
}
@Test
public void testPrivilegedClientAlwaysServed() throws Exception {
whenRequest(FULL_FETCH, PYTHON_CLIENT);
filter.doFilter(request, response, filterChain);
whenRequest(DELTA_FETCH, EurekaClientIdentity.DEFAULT_CLIENT_NAME);
filter.doFilter(request, response, filterChain);
whenRequest(APP_FETCH, EurekaServerIdentity.DEFAULT_SERVER_NAME);
filter.doFilter(request, response, filterChain);
verify(filterChain, times(3)).doFilter(request, response);
verify(response, never()).setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
}
@Test
public void testStandardClientsThrottlingEnforceable() throws Exception {
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.throttleStandardClients", true);
// Custom clients will go up to the window limit
whenRequest(FULL_FETCH, EurekaClientIdentity.DEFAULT_CLIENT_NAME);
filter.doFilter(request, response, filterChain);
filter.doFilter(request, response, filterChain);
verify(filterChain, times(2)).doFilter(request, response);
// Now we hit the limit
long rateLimiterCounter = EurekaMonitors.RATE_LIMITED.getCount();
filter.doFilter(request, response, filterChain);
assertEquals("Expected rate limiter counter increase", rateLimiterCounter + 1, EurekaMonitors.RATE_LIMITED.getCount());
verify(response, times(1)).setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
}
@Test
public void testCustomClientShedding() throws Exception {
// Custom clients will go up to the window limit
whenRequest(FULL_FETCH, CUSTOM_CLIENT);
filter.doFilter(request, response, filterChain);
filter.doFilter(request, response, filterChain);
verify(filterChain, times(2)).doFilter(request, response);
// Now we hit the limit
long rateLimiterCounter = EurekaMonitors.RATE_LIMITED.getCount();
filter.doFilter(request, response, filterChain);
assertEquals("Expected rate limiter counter increase", rateLimiterCounter + 1, EurekaMonitors.RATE_LIMITED.getCount());
verify(response, times(1)).setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
}
@Test
public void testCustomClientThrottlingCandidatesCounter() throws Exception {
ConfigurationManager.getConfigInstance().setProperty("eureka.rateLimiter.enabled", false);
// Custom clients will go up to the window limit
whenRequest(FULL_FETCH, CUSTOM_CLIENT);
filter.doFilter(request, response, filterChain);
filter.doFilter(request, response, filterChain);
verify(filterChain, times(2)).doFilter(request, response);
// Now we hit the limit
long rateLimiterCounter = EurekaMonitors.RATE_LIMITED_CANDIDATES.getCount();
filter.doFilter(request, response, filterChain);
assertEquals("Expected rate limiter counter increase", rateLimiterCounter + 1, EurekaMonitors.RATE_LIMITED_CANDIDATES.getCount());
// We just test the counter
verify(response, times(0)).setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
}
private void whenRequest(String path, String client) {
when(request.getMethod()).thenReturn("GET");
when(request.getRequestURI()).thenReturn(path);
when(request.getHeader(AbstractEurekaIdentity.AUTH_NAME_HEADER_KEY)).thenReturn(client);
}
}