Add health check, metrics and prometheus endpoints for CL participants

Issue-ID: POLICY-3747
Signed-off-by: zrrmmua <ramesh.murugan.iyer@est.tech>
Change-Id: I9cb1ffcc2f9996c5b0e9f67fec9c706e48cfa800

2 files changed, 206 insertions, 0 deletions

diff --git a/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/rest/ActuatorControllerTest.java b/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/rest/ActuatorControllerTest.java
new file mode 100644
index 000000000..9cc16e287
--- /dev/null
+++ b/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/rest/ActuatorControllerTest.java
@@ -0,0 +1,92 @@
+/*-
+ * ============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.participant.policy.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.participant.policy.main.utils.CommonActuatorController;
+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 CommonActuatorController {
+
+    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/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/utils/CommonActuatorController.java b/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/utils/CommonActuatorController.java
new file mode 100644
index 000000000..ec6e30918
--- /dev/null
+++ b/participant/participant-impl/participant-impl-policy/src/test/java/org/onap/policy/clamp/controlloop/participant/policy/main/utils/CommonActuatorController.java
@@ -0,0 +1,114 @@
+/*-
+ * ============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.participant.policy.main.utils;
+
+import static org.junit.Assert.assertEquals;
+
+import javax.ws.rs.client.Client;
+import javax.ws.rs.client.ClientBuilder;
+import javax.ws.rs.client.Invocation;
+import javax.ws.rs.client.WebTarget;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import org.glassfish.jersey.client.ClientProperties;
+import org.glassfish.jersey.client.authentication.HttpAuthenticationFeature;
+import org.onap.policy.common.gson.GsonMessageBodyHandler;
+import org.onap.policy.common.utils.network.NetworkUtil;
+
+/**
+ * Class to perform Rest unit tests.
+ *
+ */
+public class CommonActuatorController {
+
+    public static final String SELF = NetworkUtil.getHostname();
+    public static final String CONTEXT_PATH = "onap/policyparticipant";
+    public static final String ACTUATOR_ENDPOINT = CONTEXT_PATH + "/actuator/";
+
+    private static String httpPrefix;
+
+    /**
+     * 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 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
+     * @param includeAuth if authorization header should be included
+     * @return a request builder
+     * @throws Exception if an error occurs
+     */
+    protected Invocation.Builder sendFqeRequest(final String fullyQualifiedEndpoint, boolean includeAuth)
+            throws Exception {
+        final Client client = ClientBuilder.newBuilder().build();
+
+        client.property(ClientProperties.METAINF_SERVICES_LOOKUP_DISABLE, "true");
+        client.register(GsonMessageBodyHandler.class);
+
+        if (includeAuth) {
+            client.register(HttpAuthenticationFeature.basic("participantUser", "zb!XztG34"));
+        }
+
+        final WebTarget webTarget = client.target(fullyQualifiedEndpoint);
+
+        return webTarget.request(MediaType.APPLICATION_JSON, MediaType.TEXT_PLAIN);
+    }
+
+    /**
+     * 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());
+    }
+
+    /**
+     * Set Up httpPrefix.
+     *
+     * @param port the port
+     */
+    protected void setHttpPrefix(int port) {
+        httpPrefix = "http://" + SELF + ":" + port + "/";
+    }
+
+}