Export basic prometheus metrics from clamp

POLICY-3557: Export basic prometheus metrics from clamp
Change-Id: Ica71d089255e2a8881f668ceeb578993996f9a38
Signed-off-by: FrancescoFioraEst <francesco.fiora@est.tech>

6 files changed, 158 insertions, 3 deletions

diff --git a/runtime-controlloop/pom.xml b/runtime-controlloop/pom.xml
index 508f44a80..54405548f 100644
--- a/runtime-controlloop/pom.xml
+++ b/runtime-controlloop/pom.xml
@@ -84,6 +84,16 @@
             <version>${version.springfox}</version>
         </dependency>
         <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+            <version>${version.springboot}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+            <version>${version.io.micrometer}</version>
+        </dependency>
+        <dependency>
             <groupId>io.springfox</groupId>
             <artifactId>springfox-swagger-ui</artifactId>
             <scope>runtime</scope>
diff --git a/runtime-controlloop/src/main/java/org/onap/policy/clamp/controlloop/runtime/config/ConverterConfiguration.java b/runtime-controlloop/src/main/java/org/onap/policy/clamp/controlloop/runtime/config/ConverterConfiguration.java
index ee0461994..b14c675df 100644
--- a/runtime-controlloop/src/main/java/org/onap/policy/clamp/controlloop/runtime/config/ConverterConfiguration.java
+++ b/runtime-controlloop/src/main/java/org/onap/policy/clamp/controlloop/runtime/config/ConverterConfiguration.java
@@ -20,9 +20,12 @@
 
 package org.onap.policy.clamp.controlloop.runtime.config;
 
+import java.util.Arrays;
 import java.util.List;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
 import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 @Configuration
@@ -32,5 +35,9 @@ public class ConverterConfiguration implements WebMvcConfigurer {
     public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
         converters.add(new CoderHttpMesageConverter<>("yaml"));
         converters.add(new CoderHttpMesageConverter<>("json"));
+
+        StringHttpMessageConverter converter = new StringHttpMessageConverter();
+        converter.setSupportedMediaTypes(Arrays.asList(MediaType.TEXT_PLAIN));
+        converters.add(converter);
     }
 }
diff --git a/runtime-controlloop/src/main/resources/application.yaml b/runtime-controlloop/src/main/resources/application.yaml
index ea98aaa8c..cddb3d0fb 100644
--- a/runtime-controlloop/src/main/resources/application.yaml
+++ b/runtime-controlloop/src/main/resources/application.yaml
@@ -50,3 +50,9 @@ runtime:
         servers:
           - ${topicServer:localhost}
         topicCommInfrastructure: dmaap
+
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health, metrics, prometheus
diff --git a/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/main/rest/ActuatorControllerTest.java b/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/main/rest/ActuatorControllerTest.java
new file mode 100644
index 000000000..433e914ae
--- /dev/null
+++ b/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/main/rest/ActuatorControllerTest.java
@@ -0,0 +1,91 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.clamp.controlloop.runtime.main.rest;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import javax.ws.rs.client.Invocation;
+import javax.ws.rs.core.Response;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.onap.policy.clamp.controlloop.runtime.util.rest.CommonRestController;
+import org.springframework.boot.test.autoconfigure.actuate.metrics.AutoConfigureMetrics;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
+import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.test.context.TestPropertySource;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+@AutoConfigureMetrics
+@ExtendWith(SpringExtension.class)
+@SpringBootTest(webEnvironment = WebEnvironment.RANDOM_PORT)
+@TestPropertySource(locations = {"classpath:application_test.properties"})
+class ActuatorControllerTest extends CommonRestController {
+
+    private static final String HEALTH_ENDPOINT = "health";
+    private static final String METRICS_ENDPOINT = "metrics";
+    private static final String PROMETHEUS_ENDPOINT = "prometheus";
+
+    @LocalServerPort
+    private int randomServerPort;
+
+    @BeforeEach
+    public void setUpPort() {
+        super.setHttpPrefix(randomServerPort);
+    }
+
+    @Test
+    void testGetHealth_Unauthorized() throws Exception {
+        assertUnauthorizedActGet(HEALTH_ENDPOINT);
+    }
+
+    @Test
+    void testGetMetrics_Unauthorized() throws Exception {
+        assertUnauthorizedActGet(METRICS_ENDPOINT);
+    }
+
+    @Test
+    void testGetPrometheus_Unauthorized() throws Exception {
+        assertUnauthorizedActGet(PROMETHEUS_ENDPOINT);
+    }
+
+    @Test
+    void testGetHealth() throws Exception {
+        Invocation.Builder invocationBuilder = super.sendActRequest(HEALTH_ENDPOINT);
+        Response rawresp = invocationBuilder.buildGet().invoke();
+        assertEquals(Response.Status.OK.getStatusCode(), rawresp.getStatus());
+    }
+
+    @Test
+    void testGetMetrics() throws Exception {
+        Invocation.Builder invocationBuilder = super.sendActRequest(METRICS_ENDPOINT);
+        Response rawresp = invocationBuilder.buildGet().invoke();
+        assertEquals(Response.Status.OK.getStatusCode(), rawresp.getStatus());
+    }
+
+    @Test
+    void testGePrometheus() throws Exception {
+        Invocation.Builder invocationBuilder = super.sendActRequest(PROMETHEUS_ENDPOINT);
+        Response rawresp = invocationBuilder.buildGet().invoke();
+        assertEquals(Response.Status.OK.getStatusCode(), rawresp.getStatus());
+    }
+}
diff --git a/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/util/rest/CommonRestController.java b/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/util/rest/CommonRestController.java
index eebaa5281..ccac0c63b 100644
--- a/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/util/rest/CommonRestController.java
+++ b/runtime-controlloop/src/test/java/org/onap/policy/clamp/controlloop/runtime/util/rest/CommonRestController.java
@@ -42,7 +42,9 @@ import org.onap.policy.common.utils.network.NetworkUtil;
 public class CommonRestController {
 
     public static final String SELF = NetworkUtil.getHostname();
-    public static final String ENDPOINT_PREFIX = "onap/controlloop/v2/";
+    public static final String CONTEXT_PATH = "onap/controlloop";
+    public static final String ENDPOINT_PREFIX = CONTEXT_PATH + "/v2/";
+    public static final String ACTUATOR_ENDPOINT = CONTEXT_PATH + "/actuator/";
 
     private static String httpPrefix;
 
@@ -71,7 +73,18 @@ public class CommonRestController {
     }
 
     /**
-     * Sends a request to an endpoint, without any authorization header.
+     * Sends a request to an actuator endpoint.
+     *
+     * @param endpoint the target endpoint
+     * @return a request builder
+     * @throws Exception if an error occurs
+     */
+    protected Invocation.Builder sendActRequest(final String endpoint) throws Exception {
+        return sendFqeRequest(httpPrefix + ACTUATOR_ENDPOINT + endpoint, true);
+    }
+
+    /**
+     * Sends a request to an Rest Api endpoint, without any authorization header.
      *
      * @param endpoint the target endpoint
      * @return a request builder
@@ -82,6 +95,17 @@ public class CommonRestController {
     }
 
     /**
+     * Sends a request to an actuator endpoint, without any authorization header.
+     *
+     * @param endpoint the target endpoint
+     * @return a request builder
+     * @throws Exception if an error occurs
+     */
+    protected Invocation.Builder sendNoAuthActRequest(final String endpoint) throws Exception {
+        return sendFqeRequest(httpPrefix + ACTUATOR_ENDPOINT + endpoint, false);
+    }
+
+    /**
      * Sends a request to a fully qualified endpoint.
      *
      * @param fullyQualifiedEndpoint the fully qualified target endpoint
@@ -102,7 +126,7 @@ public class CommonRestController {
 
         final WebTarget webTarget = client.target(fullyQualifiedEndpoint);
 
-        return webTarget.request(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON);
+        return webTarget.request(MediaType.APPLICATION_JSON, MediaType.TEXT_PLAIN);
     }
 
     /**
@@ -141,6 +165,17 @@ public class CommonRestController {
     }
 
     /**
+     * Assert that GET call to actuator endpoint is Unauthorized.
+     *
+     * @param endPoint the endpoint
+     * @throws Exception if an error occurs
+     */
+    protected void assertUnauthorizedActGet(final String endPoint) throws Exception {
+        Response rawresp = sendNoAuthActRequest(endPoint).buildGet().invoke();
+        assertEquals(Response.Status.UNAUTHORIZED.getStatusCode(), rawresp.getStatus());
+    }
+
+    /**
      * Assert that DELETE call is Unauthorized.
      *
      * @param endPoint the endpoint
@@ -159,4 +194,8 @@ public class CommonRestController {
     protected void setHttpPrefix(int port) {
         httpPrefix = "http://" + SELF + ":" + port + "/";
     }
+
+    protected String getHttpPrefix() {
+        return httpPrefix;
+    }
 }
diff --git a/runtime-controlloop/src/test/resources/application_test.properties b/runtime-controlloop/src/test/resources/application_test.properties
index ad2a4b12c..0074d9f95 100644
--- a/runtime-controlloop/src/test/resources/application_test.properties
+++ b/runtime-controlloop/src/test/resources/application_test.properties
@@ -28,3 +28,5 @@ runtime.topicParameterGroup.topicSources[0].fetchTimeout=15000
 runtime.topicParameterGroup.topicSinks[0].topic=POLICY-CLRUNTIME-PARTICIPANT
 runtime.topicParameterGroup.topicSinks[0].servers[0]=localhost
 runtime.topicParameterGroup.topicSinks[0].topicCommInfrastructure=dmaap
+
+management.endpoints.web.exposure.include=health,metrics,prometheus