Adding healthcheck endpoint to policy/pap

1) Adding healthcheck REST endpoint to policy/pap using the
policy-endpoints module in policy/common.
2) Added the related unit test cases.

Change-Id: I6a215cceccc9cd42494aef1dfcdd46f0f3fd7d13
Issue-ID: POLICY-1477
Signed-off-by: ramverma <ram.krishna.verma@est.tech>

3 files changed, 174 insertions, 4 deletions

diff --git a/main/src/test/java/org/onap/policy/pap/main/parameters/CommonTestData.java b/main/src/test/java/org/onap/policy/pap/main/parameters/CommonTestData.java
index 5e62ba68..0e4ae523 100644
--- a/main/src/test/java/org/onap/policy/pap/main/parameters/CommonTestData.java
+++ b/main/src/test/java/org/onap/policy/pap/main/parameters/CommonTestData.java
@@ -27,6 +27,27 @@ package org.onap.policy.pap.main.parameters;
  */
 public class CommonTestData {
 
+    private static final String REST_SERVER_PASSWORD = "zb!XztG34";
+    private static final String REST_SERVER_USER = "healthcheck";
+    private static final int REST_SERVER_PORT = 6969;
+    private static final String REST_SERVER_HOST = "0.0.0.0";
     public static final String PAP_GROUP_NAME = "PapGroup";
 
+    /**
+     * Returns an instance of RestServerParameters for test cases.
+     *
+     * @param isEmpty boolean value to represent that object created should be empty or not
+     * @return the restServerParameters object
+     */
+    public RestServerParameters getRestServerParameters(final boolean isEmpty) {
+        final RestServerParameters restServerParameters;
+        if (!isEmpty) {
+            restServerParameters = new RestServerParameters(REST_SERVER_HOST, REST_SERVER_PORT, REST_SERVER_USER,
+                    REST_SERVER_PASSWORD);
+        } else {
+            restServerParameters = new RestServerParameters(null, 0, null, null);
+        }
+        return restServerParameters;
+    }
+
 }
diff --git a/main/src/test/java/org/onap/policy/pap/main/parameters/TestPapParameterGroup.java b/main/src/test/java/org/onap/policy/pap/main/parameters/TestPapParameterGroup.java
index 086d7c22..7d5355a0 100644
--- a/main/src/test/java/org/onap/policy/pap/main/parameters/TestPapParameterGroup.java
+++ b/main/src/test/java/org/onap/policy/pap/main/parameters/TestPapParameterGroup.java
@@ -33,18 +33,26 @@ import org.onap.policy.common.parameters.GroupValidationResult;
  * @author Ram Krishna Verma (ram.krishna.verma@est.tech)
  */
 public class TestPapParameterGroup {
+    CommonTestData commonTestData = new CommonTestData();
 
     @Test
     public void testPapParameterGroup() {
-        final PapParameterGroup papParameters = new PapParameterGroup(CommonTestData.PAP_GROUP_NAME);
+        final RestServerParameters restServerParameters = commonTestData.getRestServerParameters(false);
+        final PapParameterGroup papParameters =
+                new PapParameterGroup(CommonTestData.PAP_GROUP_NAME, restServerParameters);
         final GroupValidationResult validationResult = papParameters.validate();
         assertTrue(validationResult.isValid());
         assertEquals(CommonTestData.PAP_GROUP_NAME, papParameters.getName());
+        assertEquals(restServerParameters.getHost(), papParameters.getRestServerParameters().getHost());
+        assertEquals(restServerParameters.getPort(), papParameters.getRestServerParameters().getPort());
+        assertEquals(restServerParameters.getUserName(), papParameters.getRestServerParameters().getUserName());
+        assertEquals(restServerParameters.getPassword(), papParameters.getRestServerParameters().getPassword());
     }
 
     @Test
     public void testPapParameterGroup_NullName() {
-        final PapParameterGroup papParameters = new PapParameterGroup(null);
+        final RestServerParameters restServerParameters = commonTestData.getRestServerParameters(false);
+        final PapParameterGroup papParameters = new PapParameterGroup(null, restServerParameters);
         final GroupValidationResult validationResult = papParameters.validate();
         assertFalse(validationResult.isValid());
         assertEquals(null, papParameters.getName());
@@ -54,7 +62,8 @@ public class TestPapParameterGroup {
 
     @Test
     public void testPapParameterGroup_EmptyName() {
-        final PapParameterGroup papParameters = new PapParameterGroup("");
+        final RestServerParameters restServerParameters = commonTestData.getRestServerParameters(false);
+        final PapParameterGroup papParameters = new PapParameterGroup("", restServerParameters);
         final GroupValidationResult validationResult = papParameters.validate();
         assertFalse(validationResult.isValid());
         assertEquals("", papParameters.getName());
@@ -64,10 +73,25 @@ public class TestPapParameterGroup {
 
     @Test
     public void testPapParameterGroup_SetName() {
-        final PapParameterGroup papParameters = new PapParameterGroup(CommonTestData.PAP_GROUP_NAME);
+        final RestServerParameters restServerParameters = commonTestData.getRestServerParameters(false);
+        final PapParameterGroup papParameters =
+                new PapParameterGroup(CommonTestData.PAP_GROUP_NAME, restServerParameters);
         papParameters.setName("PapNewGroup");
         final GroupValidationResult validationResult = papParameters.validate();
         assertTrue(validationResult.isValid());
         assertEquals("PapNewGroup", papParameters.getName());
     }
+
+    @Test
+    public void testApiParameterGroup_EmptyRestServerParameters() {
+        final RestServerParameters restServerParameters = commonTestData.getRestServerParameters(true);
+
+        final PapParameterGroup papParameters =
+                new PapParameterGroup(CommonTestData.PAP_GROUP_NAME, restServerParameters);
+        final GroupValidationResult validationResult = papParameters.validate();
+        assertFalse(validationResult.isValid());
+        assertTrue(validationResult.getResult()
+                .contains("\"org.onap.policy.pap.main.parameters.RestServerParameters\" INVALID, "
+                        + "parameter group has status INVALID"));
+    }
 }
diff --git a/main/src/test/java/org/onap/policy/pap/main/rest/TestPapRestServer.java b/main/src/test/java/org/onap/policy/pap/main/rest/TestPapRestServer.java
new file mode 100644
index 00000000..b604e206
--- /dev/null
+++ b/main/src/test/java/org/onap/policy/pap/main/rest/TestPapRestServer.java
@@ -0,0 +1,125 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2019 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.pap.main.rest;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+
+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 org.glassfish.jersey.client.ClientConfig;
+import org.glassfish.jersey.client.authentication.HttpAuthenticationFeature;
+import org.junit.Test;
+import org.onap.policy.common.endpoints.report.HealthCheckReport;
+import org.onap.policy.common.utils.network.NetworkUtil;
+import org.onap.policy.pap.main.PolicyPapException;
+import org.onap.policy.pap.main.parameters.CommonTestData;
+import org.onap.policy.pap.main.parameters.RestServerParameters;
+import org.onap.policy.pap.main.startstop.Main;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Class to perform unit test of {@link PapRestServer}.
+ *
+ * @author Ram Krishna Verma (ram.krishna.verma@est.tech)
+ */
+public class TestPapRestServer {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(TestPapRestServer.class);
+    private static final String NOT_ALIVE = "not alive";
+    private static final String ALIVE = "alive";
+    private static final String SELF = "self";
+    private static final String NAME = "Policy PAP";
+
+    @Test
+    public void testHealthCheckSuccess() throws PolicyPapException, InterruptedException {
+        final String reportString = "Report [name=Policy PAP, url=self, healthy=true, code=200, message=alive]";
+        try {
+            final Main main = startPapService();
+            final HealthCheckReport report = performHealthCheck();
+            validateReport(NAME, SELF, true, 200, ALIVE, reportString, report);
+            stopPapService(main);
+        } catch (final Exception exp) {
+            LOGGER.error("testHealthCheckSuccess failed", exp);
+            fail("Test should not throw an exception");
+        }
+    }
+
+    @Test
+    public void testHealthCheckFailure() throws InterruptedException, IOException {
+        final String reportString = "Report [name=Policy PAP, url=self, healthy=false, code=500, message=not alive]";
+        final RestServerParameters restServerParams = new CommonTestData().getRestServerParameters(false);
+        restServerParams.setName(CommonTestData.PAP_GROUP_NAME);
+        final PapRestServer restServer = new PapRestServer(restServerParams);
+        restServer.start();
+        final HealthCheckReport report = performHealthCheck();
+        validateReport(NAME, SELF, false, 500, NOT_ALIVE, reportString, report);
+        assertTrue(restServer.isAlive());
+        assertTrue(restServer.toString().startsWith("PapRestServer [servers="));
+        restServer.shutdown();
+    }
+
+    private Main startPapService() {
+        final String[] papConfigParameters = { "-c", "parameters/PapConfigParameters.json" };
+        return new Main(papConfigParameters);
+    }
+
+    private void stopPapService(final Main main) throws PolicyPapException {
+        main.shutdown();
+    }
+
+    private HealthCheckReport performHealthCheck() throws InterruptedException, IOException {
+        HealthCheckReport response = null;
+        final ClientConfig clientConfig = new ClientConfig();
+
+        final HttpAuthenticationFeature feature = HttpAuthenticationFeature.basic("healthcheck", "zb!XztG34");
+        clientConfig.register(feature);
+
+        final Client client = ClientBuilder.newClient(clientConfig);
+        final WebTarget webTarget = client.target("http://localhost:6969/healthcheck");
+
+        final Invocation.Builder invocationBuilder = webTarget.request(MediaType.APPLICATION_JSON);
+
+        if (!NetworkUtil.isTcpPortOpen("localhost", 6969, 6, 10000L)) {
+            throw new IllegalStateException("cannot connect to port 6969");
+        }
+        response = invocationBuilder.get(HealthCheckReport.class);
+        return response;
+    }
+
+    private void validateReport(final String name, final String url, final boolean healthy, final int code,
+            final String message, final String reportString, final HealthCheckReport report) {
+        assertEquals(name, report.getName());
+        assertEquals(url, report.getUrl());
+        assertEquals(healthy, report.isHealthy());
+        assertEquals(code, report.getCode());
+        assertEquals(message, report.getMessage());
+        assertEquals(reportString, report.toString());
+    }
+}