Extracted catalog watch auto-configuration. (spring-cloud#434)

Needed in order to have that bean running in the correct application context when SC Config discovery is enabled.
Also fixes a bug where Kubernetes discovery was enabled when discovery was disabled with `spring.cloud.kubernetes.enabled=false`.

Author: TYsewyn

spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesCatalogWatchAutoConfiguration.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2013-2019 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
+ *
+ *      https://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.kubernetes.discovery;
+
+import io.fabric8.kubernetes.client.KubernetesClient;
+
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.cloud.client.ConditionalOnDiscoveryEnabled;
+import org.springframework.cloud.kubernetes.KubernetesAutoConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Auto configuration for catalog watcher.
+ *
+ * @author Tim Ysewyn
+ */
+@Configuration
+@ConditionalOnDiscoveryEnabled
+@ConditionalOnProperty(name = "spring.cloud.kubernetes.enabled", matchIfMissing = true)
+@AutoConfigureAfter({ KubernetesAutoConfiguration.class })
+public class KubernetesCatalogWatchAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean
+	@ConditionalOnProperty(name = "spring.cloud.kubernetes.discovery.catalog-services-watch.enabled", matchIfMissing = true)
+	public KubernetesCatalogWatch kubernetesCatalogWatch(KubernetesClient client) {
+		return new KubernetesCatalogWatch(client);
+	}
+
+}

spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientAutoConfiguration.java

@@ -22,6 +22,7 @@
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.cloud.client.CommonsClientAutoConfiguration;
+import org.springframework.cloud.client.ConditionalOnDiscoveryEnabled;
 import org.springframework.cloud.client.discovery.simple.SimpleDiscoveryClientAutoConfiguration;
 import org.springframework.cloud.kubernetes.registry.KubernetesRegistration;
 import org.springframework.cloud.kubernetes.registry.KubernetesServiceRegistry;
@@ -32,8 +33,10 @@
  * Auto configuration for discovery clients.
  *
  * @author Mauricio Salatino
+ * @author Tim Ysewyn
  */
 @Configuration
+@ConditionalOnDiscoveryEnabled
 @ConditionalOnProperty(name = "spring.cloud.kubernetes.enabled", matchIfMissing = true)
 @AutoConfigureBefore({ SimpleDiscoveryClientAutoConfiguration.class,
 		CommonsClientAutoConfiguration.class })
@@ -83,11 +86,4 @@ public KubernetesDiscoveryProperties getKubernetesDiscoveryProperties() {
 		return new KubernetesDiscoveryProperties();
 	}
 
-	@Bean
-	@ConditionalOnMissingBean
-	@ConditionalOnProperty(name = "spring.cloud.kubernetes.discovery.catalog-services-watch.enabled", matchIfMissing = true)
-	public KubernetesCatalogWatch kubernetesCatalogWatch(KubernetesClient client) {
-		return new KubernetesCatalogWatch(client);
-	}
-
 }

spring-cloud-kubernetes-discovery/src/main/resources/META-INF/spring.factories

@@ -1,4 +1,5 @@
 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
+org.springframework.cloud.kubernetes.discovery.KubernetesCatalogWatchAutoConfiguration, \
 org.springframework.cloud.kubernetes.discovery.KubernetesDiscoveryClientAutoConfiguration
 org.springframework.cloud.bootstrap.BootstrapConfiguration=\
 org.springframework.cloud.kubernetes.discovery.KubernetesDiscoveryClientConfigClientBootstrapConfiguration

spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesCatalogServicesWatchConfigurationTest.java

@@ -32,6 +32,7 @@
 
 /**
  * @author Oleg Vyukov
+ * @author Tim Ysewyn
  */
 public class KubernetesCatalogServicesWatchConfigurationTest {
 
@@ -56,6 +57,12 @@ public void kubernetesCatalogWatchWhenKubernetesDisabled() throws Exception {
 		assertThat(this.context.containsBean("kubernetesCatalogWatch")).isFalse();
 	}
 
+	@Test
+	public void kubernetesCatalogWatchWhenServiceDiscoveryDisabled() throws Exception {
+		setup("spring.cloud.discovery.enabled=false");
+		assertThat(this.context.containsBean("kubernetesCatalogWatch")).isFalse();
+	}
+
 	@Test
 	public void kubernetesCatalogWatchDefaultEnabled() throws Exception {
 		setup();
@@ -66,6 +73,7 @@ private void setup(String... env) {
 		this.context = new SpringApplicationBuilder(
 				PropertyPlaceholderAutoConfiguration.class,
 				KubernetesClientTestConfiguration.class,
+				KubernetesCatalogWatchAutoConfiguration.class,
 				KubernetesDiscoveryClientAutoConfiguration.class)
 						.web(WebApplicationType.NONE).properties(env).run();
 	}

spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientAutoConfigurationPropertiesTests.java

@@ -31,6 +31,7 @@
 
 /**
  * @author Ryan Dawson
+ * @author Tim Ysewyn
  */
 public class KubernetesDiscoveryClientAutoConfigurationPropertiesTests {
 
@@ -58,6 +59,13 @@ public void kubernetesDiscoveryWhenKubernetesDisabled() throws Exception {
 				.isEmpty();
 	}
 
+	@Test
+	public void kubernetesDiscoveryWhenDiscoveryDisabled() throws Exception {
+		setup("spring.cloud.discovery.enabled=false");
+		assertThat(this.context.getBeanNamesForType(KubernetesDiscoveryClient.class))
+				.isEmpty();
+	}
+
 	@Test
 	public void kubernetesDiscoveryDefaultEnabled() throws Exception {
 		setup("spring.cloud.kubernetes.enabled=true");