Structured Exception details for DMI

- Introduced DmiErrorMessage in API docs with 502 Bad Gateway
- HttpClientRequestException will be thrown which will be exposed as 502 BAD Gateway for the client from NCMP

Issue-ID: CPS-917
Change-Id: Iba8f159e8216bc1f63a9ab86208e5c802437e2e8
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>

3 files changed, 71 insertions, 25 deletions

diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImpl.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImpl.java
index 576c45c29..69e9c7ba1 100755
--- a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImpl.java
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImpl.java
@@ -47,8 +47,8 @@ import org.onap.cps.api.CpsAdminService;
 import org.onap.cps.api.CpsDataService;
 import org.onap.cps.api.CpsModuleService;
 import org.onap.cps.ncmp.api.NetworkCmProxyDataService;
+import org.onap.cps.ncmp.api.impl.exception.HttpClientRequestException;
 import org.onap.cps.ncmp.api.impl.exception.InvalidTopicException;
-import org.onap.cps.ncmp.api.impl.exception.ServerNcmpException;
 import org.onap.cps.ncmp.api.impl.operations.DmiDataOperations;
 import org.onap.cps.ncmp.api.impl.operations.DmiModelOperations;
 import org.onap.cps.ncmp.api.impl.operations.DmiOperations;
@@ -149,9 +149,8 @@ public class NetworkCmProxyDataServiceImpl implements NetworkCmProxyDataService
                                                                final String requestData,
                                                                final String dataType) {
         return handleResponse(
-            dmiDataOperations.writeResourceDataPassThroughRunningFromDmi(
-                cmHandleId, resourceIdentifier, operation, requestData, dataType),
-            "Not able to " + operation + " resource data.");
+                dmiDataOperations.writeResourceDataPassThroughRunningFromDmi(cmHandleId, resourceIdentifier, operation,
+                        requestData, dataType), operation);
     }
 
 
@@ -225,14 +224,13 @@ public class NetworkCmProxyDataServiceImpl implements NetworkCmProxyDataService
         registerAndSyncNewCmHandles(createdYangModelCmHandlesList);
     }
 
-    private static Object handleResponse(final ResponseEntity<?> responseEntity,
-                                         final String exceptionMessage) {
+    private static Object handleResponse(final ResponseEntity<?> responseEntity, final OperationEnum operation) {
         if (responseEntity.getStatusCode().is2xxSuccessful()) {
             return responseEntity.getBody();
         } else {
-            throw new ServerNcmpException(exceptionMessage,
-                    "DMI status code: " + responseEntity.getStatusCodeValue()
-                            + ", DMI response body: " + responseEntity.getBody());
+            final String exceptionMessage = "Unable to " + operation.toString() + " resource data.";
+            throw new HttpClientRequestException(exceptionMessage, (String) responseEntity.getBody(),
+                    responseEntity.getStatusCodeValue());
         }
     }
 
@@ -355,6 +353,6 @@ public class NetworkCmProxyDataServiceImpl implements NetworkCmProxyDataService
         final ResponseEntity<?> responseEntity = dmiDataOperations.getResourceDataFromDmi(
                 cmHandleId, resourceIdentifier, optionsParamInQuery, acceptParamInHeader,
                 dataStore, NO_REQUEST_ID, NO_TOPIC);
-        return handleResponse(responseEntity, "Not able to get resource data.");
+        return handleResponse(responseEntity, OperationEnum.READ);
     }
 }
\ No newline at end of file
diff --git a/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/exception/HttpClientRequestException.java b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/exception/HttpClientRequestException.java
new file mode 100644
index 000000000..9d307e5d2
--- /dev/null
+++ b/cps-ncmp-service/src/main/java/org/onap/cps/ncmp/api/impl/exception/HttpClientRequestException.java
@@ -0,0 +1,45 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2022 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.cps.ncmp.api.impl.exception;
+
+import lombok.Getter;
+
+/**
+ * Http Client Request exception for passthrough scenarios.
+ */
+@Getter
+public class HttpClientRequestException extends NcmpException {
+
+    private static final long serialVersionUID = 6659897770659834797L;
+    final Integer httpStatus;
+
+    /**
+     * Constructor to form exception for passthrough scenarios.
+     *
+     * @param message    message details from NCMP
+     * @param details    response body from the client available as details
+     * @param httpStatus http status code from the client
+     */
+    public HttpClientRequestException(final String message, final String details, final Integer httpStatus) {
+        super(message, details);
+        this.httpStatus = httpStatus;
+    }
+}
diff --git a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImplSpec.groovy b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImplSpec.groovy
index c21d7e774..06b2032b9 100644
--- a/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImplSpec.groovy
+++ b/cps-ncmp-service/src/test/groovy/org/onap/cps/ncmp/api/impl/NetworkCmProxyDataServiceImplSpec.groovy
@@ -22,6 +22,7 @@
 
 package org.onap.cps.ncmp.api.impl
 
+import org.onap.cps.ncmp.api.impl.exception.HttpClientRequestException
 import org.onap.cps.ncmp.api.impl.exception.InvalidTopicException
 import org.onap.cps.ncmp.api.impl.operations.YangModelCmHandleRetriever
 import org.onap.cps.ncmp.api.impl.yangmodels.YangModelCmHandle
@@ -40,7 +41,6 @@ import com.fasterxml.jackson.databind.ObjectMapper
 import org.onap.cps.api.CpsAdminService
 import org.onap.cps.api.CpsDataService
 import org.onap.cps.api.CpsModuleService
-import org.onap.cps.ncmp.api.impl.exception.ServerNcmpException
 import org.onap.cps.ncmp.api.impl.operations.DmiDataOperations
 import org.onap.cps.spi.FetchDescendantsOption
 import org.onap.cps.spi.model.DataNode
@@ -98,9 +98,9 @@ class NetworkCmProxyDataServiceImplSpec extends Specification {
                 'testResourceId', CREATE,
                 '{some-json}', 'application/json')
         then: 'exception is thrown'
-            def exceptionThrown = thrown(ServerNcmpException.class)
-        and: 'details contains (not found) error code: 404'
-            exceptionThrown.details.contains('404')
+            def exceptionThrown = thrown(HttpClientRequestException.class)
+        and: 'http status (not found) error code: 404'
+            exceptionThrown.httpStatus == HttpStatus.NOT_FOUND.value()
     }
 
     def 'Get resource data for pass-through operational from DMI.'() {
@@ -141,9 +141,10 @@ class NetworkCmProxyDataServiceImplSpec extends Specification {
                     'testAcceptParam',
                     OPTIONS_PARAM,
                     NO_TOPIC)
-        then: 'exception is thrown with the expected details'
-            def exceptionThrown = thrown(ServerNcmpException.class)
-            exceptionThrown.details == 'DMI status code: 404, DMI response body: NOK-json'
+        then: 'exception is thrown with the expected response code and details'
+            def exceptionThrown = thrown(HttpClientRequestException.class)
+            exceptionThrown.details.contains('NOK-json')
+            exceptionThrown.httpStatus == HttpStatus.NOT_FOUND.value()
     }
 
     def 'Get resource data for pass-through operational from DMI return NOK response.'() {
@@ -166,8 +167,9 @@ class NetworkCmProxyDataServiceImplSpec extends Specification {
                     OPTIONS_PARAM,
                     NO_TOPIC)
         then: 'exception is thrown'
-            def exceptionThrown = thrown(ServerNcmpException.class)
-        and: 'details contains the original response'
+            def exceptionThrown = thrown(HttpClientRequestException.class)
+        and: 'details contain the original response'
+            exceptionThrown.httpStatus == HttpStatus.NOT_FOUND.value()
             exceptionThrown.details.contains('NOK-json')
     }
 
@@ -213,9 +215,10 @@ class NetworkCmProxyDataServiceImplSpec extends Specification {
                     OPTIONS_PARAM,
                     NO_TOPIC)
         then: 'exception is thrown'
-            def exceptionThrown = thrown(ServerNcmpException.class)
-        and: 'details contains the original response'
+            def exceptionThrown = thrown(HttpClientRequestException.class)
+        and: 'details contain the original response'
             exceptionThrown.details.contains('NOK-json')
+            exceptionThrown.httpStatus == HttpStatus.NOT_FOUND.value()
     }
 
     def 'DMI Operational data request with #scenario'() {
@@ -340,12 +343,12 @@ class NetworkCmProxyDataServiceImplSpec extends Specification {
                 '{some-json}',
                 'application/json')
         then: 'an exception is thrown with the expected error message details with correct operation'
-            def exceptionThrown = thrown(ServerNcmpException.class)
+            def exceptionThrown = thrown(HttpClientRequestException.class)
             exceptionThrown.getMessage().contains(expectedResponseMessage)
         where:
             scenario | givenOperation || expectedResponseMessage
-            'CREATE' | CREATE         || 'Not able to create resource data.'
-            'READ'   | READ           || 'Not able to read resource data.'
-            'UPDATE' | UPDATE         || 'Not able to update resource data.'
+            'CREATE' | CREATE         || 'Unable to create resource data.'
+            'READ'   | READ           || 'Unable to read resource data.'
+            'UPDATE' | UPDATE         || 'Unable to update resource data.'
     }
 }