Disable config server client by default in config server

This change adds a listener that inserts a PropertySource really early
so that spring.cloud.config.enabled=false is the default in a config
server. It can be overridden if the user primes the Environment with
spring.cloud.config.enabled=true.

See gh-104

spring-cloud-config-server/src/main/java/org/springframework/cloud/config/server/ConfigServerBootstrapApplicationListener.java

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2014-2015 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.config.server;
+
+import java.util.Collections;
+
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.core.Ordered;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.Environment;
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.core.env.PropertySource;
+
+/**
+ * Normally you don't want the config server to be a config client itself, so this
+ * listener disables the config client unless <code>spring.cloud.config.enabled</code> is
+ * explicitly "true". It has to be "true" at the time this listener is fired, which means
+ * <b>before</b> the <code>bootstrap.yml</code> is parsed, which in turn means to you need
+ * to launch the application with an existing primed {@link Environment} (e.g. via System
+ * properties or a {@link SpringApplicationBuilder}). This is the same rule of precedence
+ * as for anything else affecting the bootstrap process itself, e.g. setting
+ * <code>spring.cloud.bootstrap.name</code> to something other than "bootstrap".
+ * 
+ * @author Dave Syer
+ *
+ */
+public class ConfigServerBootstrapApplicationListener implements
+		ApplicationListener<ApplicationEnvironmentPreparedEvent>, Ordered {
+
+	public static final int DEFAULT_ORDER = Ordered.HIGHEST_PRECEDENCE + 4;
+
+	private int order = DEFAULT_ORDER;
+
+	private PropertySource<?> propertySource = new MapPropertySource(
+			"configServerClient", Collections.<String, Object> singletonMap(
+					"spring.cloud.config.enabled", "false"));
+
+	public void setOrder(int order) {
+		this.order = order;
+	}
+
+	@Override
+	public int getOrder() {
+		return this.order;
+	}
+
+	@Override
+	public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
+		ConfigurableEnvironment environment = event.getEnvironment();
+		if (!environment.resolvePlaceholders("${spring.cloud.config.enabled:false}")
+				.equalsIgnoreCase("true")) {
+			if (!environment.getPropertySources().contains(propertySource.getName())) {
+				environment.getPropertySources().addLast(propertySource);
+			}
+		}
+	}
+
+}

spring-cloud-config-server/src/main/java/org/springframework/cloud/config/server/ConfigServerBootstrapConfiguration.java

@@ -32,21 +32,25 @@ import org.springframework.context.annotation.Import;
  * @author Dave Syer
  *
  */
-@ConditionalOnProperty("spring.cloud.config.server.bootstrap")
 @Configuration
-@Import(ConfigServerConfiguration.class)
 public class ConfigServerBootstrapConfiguration {
 
-	@Autowired
-	private EnvironmentRepository repository;
+	@ConditionalOnProperty("spring.cloud.config.server.bootstrap")
+	@Import(ConfigServerConfiguration.class)
+	protected static class LocalPropertySourceLocatorConfiguration {
 
-	@Autowired
-	private ConfigClientProperties client;
+		@Autowired
+		private EnvironmentRepository repository;
+
+		@Autowired
+		private ConfigClientProperties client;
+
+		@Bean
+		public EnvironmentRepositoryPropertySourceLocator environmentRepositoryPropertySourceLocator() {
+			return new EnvironmentRepositoryPropertySourceLocator(repository,
+					client.getName(), client.getProfile(), client.getLabel());
+		}
 
-	@Bean
-	public EnvironmentRepositoryPropertySourceLocator environmentRepositoryPropertySourceLocator() {
-		return new EnvironmentRepositoryPropertySourceLocator(repository,
-				client.getName(), client.getProfile(), client.getLabel());
 	}
 
 }

spring-cloud-config-server/src/main/resources/META-INF/spring.factories

@@ -1,3 +1,7 @@
 # Bootstrap components
 org.springframework.cloud.bootstrap.BootstrapConfiguration=\
-org.springframework.cloud.config.server.ConfigServerBootstrapConfiguration
+org.springframework.cloud.config.server.ConfigServerBootstrapConfiguration
+
+# Application listeners
+org.springframework.context.ApplicationListener=\
+org.springframework.cloud.config.server.ConfigServerBootstrapApplicationListener

spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/BootstrapConfigServerIntegrationTests.java

@@ -21,8 +21,7 @@ import org.springframework.test.context.web.WebAppConfiguration;
 
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = ConfigServerApplication.class)
-@IntegrationTest({ "debug", "server.port:0",
-		"spring.cloud.bootstrap.name:enable-bootstrap" })
+@IntegrationTest({ "server.port:0", "spring.cloud.bootstrap.name:enable-bootstrap" })
 @WebAppConfiguration
 @ActiveProfiles("test")
 public class BootstrapConfigServerIntegrationTests {
@@ -43,8 +42,8 @@ public class BootstrapConfigServerIntegrationTests {
 		Environment environment = new TestRestTemplate().getForObject("http://localhost:"
 				+ port + "/foo/development/", Environment.class);
 		assertFalse(environment.getPropertySources().isEmpty());
-		assertEquals("bar", environment.getPropertySources().get(0)
-				.getSource().get("info.foo"));
+		assertEquals("bar",
+				environment.getPropertySources().get(0).getSource().get("info.foo"));
 	}
 
 	@Test

spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ConfigClientOffIntegrationTests.java

@@ -0,0 +1,71 @@
+package org.springframework.cloud.config.server;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.BeanFactoryUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.cloud.config.client.ConfigServicePropertySourceLocator;
+import org.springframework.cloud.config.environment.Environment;
+import org.springframework.cloud.config.server.ConfigClientOffIntegrationTests.TestConfiguration;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = TestConfiguration.class)
+@IntegrationTest("server.port:0")
+@WebAppConfiguration
+@ActiveProfiles("test")
+public class ConfigClientOffIntegrationTests {
+
+	@Value("${local.server.port}")
+	private int port;
+
+	@Autowired
+	private ApplicationContext context;
+
+	@BeforeClass
+	public static void init() throws IOException {
+		ConfigServerTestUtils.prepareLocalRepo();
+	}
+
+	@Test
+	public void contextLoads() {
+		Environment environment = new TestRestTemplate().getForObject("http://localhost:"
+				+ port + "/foo/development/", Environment.class);
+		assertTrue(environment.getPropertySources().isEmpty());
+	}
+
+	@Test
+	public void configClientDisabled() throws Exception {
+		assertEquals(0, BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context,
+				ConfigServicePropertySourceLocator.class).length);
+	}
+	
+	@Configuration
+	@Import(ConfigServerApplication.class)
+	protected static class TestConfiguration {
+		
+		@Bean
+		public EnvironmentRepository environmentRepository() {
+			return Mockito.mock(EnvironmentRepository.class);
+		}
+		
+	}
+
+}

spring-cloud-config-server/src/test/java/org/springframework/cloud/config/server/ConfigClientOnIntegrationTests.java

@@ -0,0 +1,71 @@
+package org.springframework.cloud.config.server;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.BeanFactoryUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.test.IntegrationTest;
+import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.TestRestTemplate;
+import org.springframework.cloud.config.client.ConfigServicePropertySourceLocator;
+import org.springframework.cloud.config.environment.Environment;
+import org.springframework.cloud.config.server.ConfigClientOnIntegrationTests.TestConfiguration;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringApplicationConfiguration(classes = TestConfiguration.class)
+@IntegrationTest({ "server.port:0", "spring.cloud.config.enabled:true" })
+@WebAppConfiguration
+@ActiveProfiles("test")
+public class ConfigClientOnIntegrationTests {
+
+	@Value("${local.server.port}")
+	private int port;
+
+	@Autowired
+	private ApplicationContext context;
+
+	@BeforeClass
+	public static void init() throws IOException {
+		ConfigServerTestUtils.prepareLocalRepo();
+	}
+
+	@Test
+	public void contextLoads() {
+		Environment environment = new TestRestTemplate().getForObject("http://localhost:"
+				+ port + "/foo/development/", Environment.class);
+		assertTrue(environment.getPropertySources().isEmpty());
+	}
+
+	@Test
+	public void configClientEnabled() throws Exception {
+		assertEquals(1, BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context,
+				ConfigServicePropertySourceLocator.class).length);
+	}
+	
+	@Configuration
+	@Import(ConfigServerApplication.class)
+	protected static class TestConfiguration {
+		
+		@Bean
+		public EnvironmentRepository environmentRepository() {
+			return Mockito.mock(EnvironmentRepository.class);
+		}
+		
+	}
+
+}