RabbitMQ Support

[resolves #21]

Signed-off-by: Ben Hale <bhale@vmware.com>

README.md

@@ -149,6 +149,19 @@ Disable Property: `org.springframework.cloud.bindings.boot.postgresql.enable`
 | `spring.datasource.url` | `jdbc:postgres://{host}:{port}/{database}`
 | `spring.datasource.username` | `{username}`
 
+### RabbitMQ RDBMS
+Kind: `RabbitMQ`
+Disable Property: `org.springframework.cloud.bindings.boot.rabbitmq.enable`
+
+| Property | Value (`{secret}`)
+| -------- | ------------------
+| `spring.rabbitmq.addresses` | `{addresses}`
+| `spring.rabbitmq.host` | `{host}`
+| `spring.rabbitmq.password` | `{password}`
+| `spring.rabbitmq.port` | `{port}`
+| `spring.rabbitmq.username` | `{username}`
+| `spring.rabbitmq.virtual-host` | `{virtual-host}`
+
 ### Redis RDBMS
 Kind: `Redis`
 Disable Property: `org.springframework.cloud.bindings.boot.redis.enable`

src/main/java/org/springframework/cloud/bindings/boot/RabbitMqBindingsPropertiesProcessor.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2020 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.bindings.boot;
+
+import org.springframework.cloud.bindings.Binding;
+import org.springframework.cloud.bindings.Bindings;
+import org.springframework.core.env.Environment;
+
+import java.util.Map;
+
+import static org.springframework.cloud.bindings.boot.Guards.isKindEnabled;
+
+/**
+ * An implementation of {@link BindingsPropertiesProcessor} that detects {@link Binding}s of kind: {@value KIND}.
+ */
+final class RabbitMqBindingsPropertiesProcessor implements BindingsPropertiesProcessor {
+
+    /**
+     * The {@link Binding} kind that this processor is interested in: {@value}.
+     **/
+    public static final String KIND = "RabbitMQ";
+
+    @Override
+    public void process(Environment environment, Bindings bindings, Map<String, Object> properties) {
+        if (!isKindEnabled(environment, KIND)) {
+            return;
+        }
+
+        bindings.filterBindings(KIND).forEach(binding -> {
+            MapMapper map = new MapMapper(binding.getSecret(), properties);
+
+            map.from("addresses").to("spring.rabbitmq.addresses");
+            map.from("host").to("spring.rabbitmq.host");
+            map.from("password").to("spring.rabbitmq.password");
+            map.from("port").to("spring.rabbitmq.port");
+            map.from("username").to("spring.rabbitmq.username");
+            map.from("virtual-host").to("spring.rabbitmq.virtual-host");
+        });
+    }
+
+}

src/main/resources/META-INF/spring.factories

@@ -12,5 +12,6 @@ org.springframework.cloud.bindings.boot.BindingsPropertiesProcessor=\
   org.springframework.cloud.bindings.boot.Neo4JBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.OracleBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.PostgreSqlBindingsPropertiesProcessor, \
+  org.springframework.cloud.bindings.boot.RabbitMqBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.RedisBindingsPropertiesProcessor, \
   org.springframework.cloud.bindings.boot.SqlServerBindingsPropertiesProcessor

src/test/java/org/springframework/cloud/bindings/boot/BindingSpecificEnvironmentPostProcessorTest.java

@@ -98,7 +98,7 @@ final class BindingSpecificEnvironmentPostProcessorTest {
     @Test
     @DisplayName("included implementations are registered")
     void includedImplementations() {
-        assertThat(new BindingSpecificEnvironmentPostProcessor().processors).hasSize(11);
+        assertThat(new BindingSpecificEnvironmentPostProcessor().processors).hasSize(12);
     }
 
 }

src/test/java/org/springframework/cloud/bindings/boot/RabbitMqBindingsPropertiesProcessorTest.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2020 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.bindings.boot;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.cloud.bindings.Binding;
+import org.springframework.cloud.bindings.Bindings;
+import org.springframework.cloud.bindings.FluentMap;
+import org.springframework.mock.env.MockEnvironment;
+
+import java.nio.file.Paths;
+import java.util.Collections;
+import java.util.HashMap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.cloud.bindings.boot.RabbitMqBindingsPropertiesProcessor.KIND;
+
+@DisplayName("RabbitMQ BindingsPropertiesProcessor")
+final class RabbitMqBindingsPropertiesProcessorTest {
+
+    private final Bindings bindings = new Bindings(
+            new Binding("test-name", Paths.get("test-path"),
+                    Collections.singletonMap("kind", KIND),
+                    new FluentMap()
+                            .withEntry("addresses", "test-addresses")
+                            .withEntry("host", "test-host")
+                            .withEntry("password", "test-password")
+                            .withEntry("port", "test-port")
+                            .withEntry("username", "test-username")
+                            .withEntry("virtual-host", "test-virtual-host")
+            )
+    );
+
+    private final MockEnvironment environment = new MockEnvironment();
+
+    private final HashMap<String, Object> properties = new HashMap<>();
+
+    @Test
+    @DisplayName("contributes properties")
+    void test() {
+        new RabbitMqBindingsPropertiesProcessor().process(environment, bindings, properties);
+        assertThat(properties)
+                .containsEntry("spring.rabbitmq.addresses", "test-addresses")
+                .containsEntry("spring.rabbitmq.host", "test-host")
+                .containsEntry("spring.rabbitmq.password", "test-password")
+                .containsEntry("spring.rabbitmq.port", "test-port")
+                .containsEntry("spring.rabbitmq.username", "test-username")
+                .containsEntry("spring.rabbitmq.virtual-host", "test-virtual-host");
+    }
+
+    @Test
+    @DisplayName("can be disabled")
+    void disabled() {
+        environment.setProperty("org.springframework.cloud.bindings.boot.rabbitmq.enable", "false");
+
+        new RabbitMqBindingsPropertiesProcessor().process(environment, bindings, properties);
+
+        assertThat(properties).isEmpty();
+    }
+
+}