implement dmi get modules using sdnc client

Issue-ID: CPS-483
Change-Id: Ib9b730cabeba308f11db31ef1b45bbd92e3a6ed5
Signed-off-by: tragait <rahul.tyagi@est.tech>

18 files changed, 598 insertions, 52 deletions

diff --git a/docs/openapi/openapi.yml b/docs/openapi/openapi.yml
index 36e3d12e..7d0569d4 100644
--- a/docs/openapi/openapi.yml
+++ b/docs/openapi/openapi.yml
@@ -24,22 +24,52 @@ info:
 servers:
   - url: //localhost:8088/
 tags:
-  - name: dmi-rest
-    description: DMI Rest
+  - name: dmi-plugin-internal
+    description: DMI plugin internal rest apis
+  - name: dmi-plugin
+    description: DMI plugin rest apis
+
+
 paths:
-  /v1/helloworld:
-    get:
-      description: Hello World
+  /v1/ch/{cmHandle}/modules :
+    post:
       tags:
         - dmi-plugin
-      summary: Hello World
-      operationId: helloWorld
+      summary: Get all modules for cm handle
+      description: Get all modules for given cm handle
+      operationId: getModulesForCmHandle
+      parameters:
+        - name: cmHandle
+          in: path
+          description: The cm handle to fetch all the modules
+          required: true
+          schema:
+            type: string
       responses:
         '200':
-          $ref: 'components.yml#/components/responses/Ok'
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: string
+                example: {
+                            'schemas': {
+                              'schema': [
+                                {
+                                  'identifier': 'example-identifier',
+                                  'version': 'example-version',
+                                  'format': 'example-format',
+                                  'namespace': 'example:namespace',
+                                  'location': [
+                                    'example-location'
+                                  ]
+                                }
+                              ]
+                            }
+                          }
         '400':
           $ref: 'components.yml#/components/responses/BadRequest'
         '401':
           $ref: 'components.yml#/components/responses/Unauthorized'
         '403':
-          $ref: 'components.yml#/components/responses/Forbidden'
+          $ref: 'components.yml#/components/responses/Forbidden'
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
index a6815aef..fd1f1894 100644
--- a/pom.xml
+++ b/pom.xml
@@ -159,8 +159,8 @@
                             <inputSpec>${project.basedir}/docs/openapi/openapi.yml</inputSpec>
                             <language>spring</language>
                             <generateSupportingFiles>false</generateSupportingFiles>
-                            <apiPackage>org.onap.cps.ncmp.rest.api</apiPackage>
-                            <modelPackage>org.onap.cps.ncmp.rest.model</modelPackage>
+                            <apiPackage>org.onap.cps.ncmp.dmi.rest.api</apiPackage>
+                            <modelPackage>org.onap.cps.ncmp.dmi.model</modelPackage>
                             <configOptions>
                                 <sourceFolder>src/gen/java</sourceFolder>
                                 <dateLibrary>java11</dateLibrary>
@@ -320,7 +320,8 @@
                 <version>0.8.5</version>
                 <configuration>
                     <excludes>
-                        <exclude>org/onap/cps/ncmp/rest/model/*</exclude>
+                        <exclude>org/onap/cps/ncmp/dmi/model/*</exclude>
+                        <exclude>org/onap/cps/ncmp/dmi/config/*</exclude>
                     </excludes>
                 </configuration>
                 <executions>
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/config/CpsConfiguration.java b/src/main/java/org/onap/cps/ncmp/dmi/config/DmiConfiguration.java
index a9970da8..9b8b05b2 100644
--- a/src/main/java/org/onap/cps/ncmp/dmi/config/CpsConfiguration.java
+++ b/src/main/java/org/onap/cps/ncmp/dmi/config/DmiConfiguration.java
@@ -32,7 +32,7 @@ import org.springframework.web.client.RestTemplate;
  * Provides access to cps base url and cps authentication.
  */
 @Configuration
-public class CpsConfiguration {
+public class DmiConfiguration {
 
     @Getter
     @Component
@@ -48,6 +48,20 @@ public class CpsConfiguration {
         private String authPassword;
     }
 
+    @Getter
+    @Component
+    public static class SdncProperties {
+
+        @Value("${sdnc.baseUrl}")
+        private String baseUrl;
+        @Value("${sdnc.auth.username}")
+        private String authUsername;
+        @Value("${sdnc.auth.password}")
+        private String authPassword;
+        @Value("${sdnc.topologyId}")
+        public String topologyId;
+    }
+
     @Bean
     public RestTemplate restTemplate(final RestTemplateBuilder restTemplateBuilder) {
         return restTemplateBuilder.build();
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiException.java b/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiException.java
new file mode 100644
index 00000000..c099a1cc
--- /dev/null
+++ b/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiException.java
@@ -0,0 +1,59 @@
+/*
+ *  ============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.cps.ncmp.dmi.exception;
+
+import lombok.Getter;
+
+/**
+ * Dmi exception.
+ */
+public class DmiException extends RuntimeException {
+
+    private static final long serialVersionUID = 1481520410918497487L;
+
+    @Getter
+    final String details;
+
+    /**
+     * Constructor.
+     *
+     * @param message the error message
+     * @param details the error details
+     */
+    public DmiException(final String message, final String details) {
+        super(message);
+        this.details = details;
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param message the error message
+     * @param details the error details
+     * @param cause   the cause of the exception
+     */
+    public DmiException(final String message, final String details, final Throwable cause) {
+        super(message, cause);
+        this.details = details;
+    }
+
+}
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiExceptionHandler.java b/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiExceptionHandler.java
new file mode 100644
index 00000000..9ad561fc
--- /dev/null
+++ b/src/main/java/org/onap/cps/ncmp/dmi/exception/DmiExceptionHandler.java
@@ -0,0 +1,74 @@
+/*
+ *  ============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.cps.ncmp.dmi.exception;
+
+import lombok.extern.slf4j.Slf4j;
+import org.onap.cps.ncmp.dmi.model.ErrorMessage;
+import org.onap.cps.ncmp.dmi.rest.controller.DmiRestController;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@Slf4j
+@RestControllerAdvice(assignableTypes = {DmiRestController.class})
+public class DmiExceptionHandler {
+
+    private DmiExceptionHandler() {
+    }
+
+    /**
+     * Default exception handler.
+     *
+     * @param exception the exception to handle
+     * @return response with response code 500.
+     */
+    @ExceptionHandler
+    public static ResponseEntity<Object> handleInternalServerErrorExceptions(final Exception exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception);
+    }
+
+    @ExceptionHandler({ModulesNotFoundException.class})
+    public static ResponseEntity<Object> handleNotFoundExceptions(final DmiException exception) {
+        return buildErrorResponse(HttpStatus.NOT_FOUND, exception);
+    }
+
+    @ExceptionHandler({DmiException.class})
+    public static ResponseEntity<Object> handleAnyOtherDmiExceptions(final DmiException exception) {
+        return buildErrorResponse(HttpStatus.INTERNAL_SERVER_ERROR, exception);
+    }
+
+    private static ResponseEntity<Object> buildErrorResponse(final HttpStatus httpStatus, final Exception exception) {
+        logForNonDmiException(exception);
+        final var errorMessage = new ErrorMessage();
+        errorMessage.setStatus(httpStatus.toString());
+        errorMessage.setMessage(exception.getMessage());
+        errorMessage.setDetails(exception instanceof DmiException ? ((DmiException) exception).getDetails() :
+                "Check logs for details.");
+        return new ResponseEntity<>(errorMessage, httpStatus);
+    }
+
+    private static void logForNonDmiException(final Exception exception) {
+        if (exception.getCause() != null || !(exception instanceof DmiException)) {
+            log.error("Exception occurred", exception);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/exception/ModulesNotFoundException.java b/src/main/java/org/onap/cps/ncmp/dmi/exception/ModulesNotFoundException.java
new file mode 100644
index 00000000..ded54d91
--- /dev/null
+++ b/src/main/java/org/onap/cps/ncmp/dmi/exception/ModulesNotFoundException.java
@@ -0,0 +1,38 @@
+/*
+ *  ============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.cps.ncmp.dmi.exception;
+
+public class ModulesNotFoundException extends DmiException {
+
+    private static final long serialVersionUID = 980438585188332404L;
+
+    private static final String ERROR_MESSAGE = "Not able to register the given cm-handles: ";
+
+    /**
+     * Constructor.
+     *
+     * @param cmHandle cmHandle identifier
+     * @param details the error details
+     */
+    public ModulesNotFoundException(final String cmHandle, final String details) {
+        super(ERROR_MESSAGE + cmHandle, details);
+    }
+}
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/rest/controller/DmiRestController.java b/src/main/java/org/onap/cps/ncmp/dmi/rest/controller/DmiRestController.java
index c4cbaece..8081b73d 100644
--- a/src/main/java/org/onap/cps/ncmp/dmi/rest/controller/DmiRestController.java
+++ b/src/main/java/org/onap/cps/ncmp/dmi/rest/controller/DmiRestController.java
@@ -20,8 +20,8 @@
 
 package org.onap.cps.ncmp.dmi.rest.controller;
 
+import org.onap.cps.ncmp.dmi.rest.api.DmiPluginApi;
 import org.onap.cps.ncmp.dmi.service.DmiService;
-import org.onap.cps.ncmp.rest.api.DmiPluginApi;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
@@ -32,13 +32,17 @@ import org.springframework.web.bind.annotation.RestController;
 @RestController
 public class DmiRestController implements DmiPluginApi {
 
-    @Autowired
     private DmiService dmiService;
 
-    @Override
-    public ResponseEntity<Object> helloWorld() {
-        final var helloWorld = dmiService.getHelloWorld();
-        return new ResponseEntity<>(helloWorld, HttpStatus.OK);
+    @Autowired
+    public DmiRestController(final DmiService dmiService) {
+        this.dmiService = dmiService;
     }
 
+    @Override
+    public ResponseEntity<String> getModulesForCmHandle(final String cmHandle) {
+
+        final String modulesListAsJson = dmiService.getModulesForCmHandle(cmHandle);
+        return new ResponseEntity<>(modulesListAsJson, HttpStatus.OK);
+    }
 }
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/service/DmiService.java b/src/main/java/org/onap/cps/ncmp/dmi/service/DmiService.java
index 84c60d55..e595bd5f 100644
--- a/src/main/java/org/onap/cps/ncmp/dmi/service/DmiService.java
+++ b/src/main/java/org/onap/cps/ncmp/dmi/service/DmiService.java
@@ -20,12 +20,20 @@
 
 package org.onap.cps.ncmp.dmi.service;
 
+import org.onap.cps.ncmp.dmi.exception.DmiException;
+
 /**
  * Interface for handling Dmi plugin Data.
  */
 public interface DmiService {
+
     /**
-     * Return Simple Hello World Statement.
+     * This method fetches all modules for given Cm Handle.
+     *
+     * @param cmHandle cm-handle to fetch the modules information
+     * @return {@code String} returns all modules
+     * @throws DmiException can throw dmi exception
      */
-    String getHelloWorld();
+    String getModulesForCmHandle(String cmHandle) throws DmiException;
+
 }
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/service/DmiServiceImpl.java b/src/main/java/org/onap/cps/ncmp/dmi/service/DmiServiceImpl.java
index 5051b1ad..4367bf45 100644
--- a/src/main/java/org/onap/cps/ncmp/dmi/service/DmiServiceImpl.java
+++ b/src/main/java/org/onap/cps/ncmp/dmi/service/DmiServiceImpl.java
@@ -20,13 +20,37 @@
 
 package org.onap.cps.ncmp.dmi.service;
 
+import io.micrometer.core.instrument.util.StringUtils;
+import org.onap.cps.ncmp.dmi.exception.DmiException;
+import org.onap.cps.ncmp.dmi.exception.ModulesNotFoundException;
+import org.onap.cps.ncmp.dmi.service.operation.SdncOperations;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 
 @Service
 public class DmiServiceImpl implements DmiService {
 
+    private SdncOperations sdncOperations;
+
+    @Autowired
+    public DmiServiceImpl(final SdncOperations sdncOperations) {
+        this.sdncOperations = sdncOperations;
+    }
+
     @Override
-    public String getHelloWorld() {
-        return "Hello World";
+    public String getModulesForCmHandle(final String cmHandle) throws DmiException {
+        final ResponseEntity<String> responseEntity = sdncOperations.getModulesFromNode(cmHandle);
+        if (responseEntity.getStatusCode() == HttpStatus.OK) {
+            final String responseBody = responseEntity.getBody();
+            if (StringUtils.isEmpty(responseBody)) {
+                throw new ModulesNotFoundException(cmHandle, "SDNC returned no modules for given cm-handle.");
+            }
+            return responseBody;
+        } else {
+            throw new DmiException("SDNC is not able to process request.",
+                    "response code : " + responseEntity.getStatusCode() + " message : " + responseEntity.getBody());
+        }
     }
 }
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/service/client/NcmpRestClient.java b/src/main/java/org/onap/cps/ncmp/dmi/service/client/NcmpRestClient.java
index 2158e836..47651346 100644
--- a/src/main/java/org/onap/cps/ncmp/dmi/service/client/NcmpRestClient.java
+++ b/src/main/java/org/onap/cps/ncmp/dmi/service/client/NcmpRestClient.java
@@ -20,7 +20,7 @@
 
 package org.onap.cps.ncmp.dmi.service.client;
 
-import org.onap.cps.ncmp.dmi.config.CpsConfiguration.CpsProperties;
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration.CpsProperties;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClient.java b/src/main/java/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClient.java
new file mode 100644
index 00000000..cf7c50a5
--- /dev/null
+++ b/src/main/java/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClient.java
@@ -0,0 +1,57 @@
+/*
+ *  ============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.cps.ncmp.dmi.service.client;
+
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration.SdncProperties;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+
+@Component
+public class SdncRestconfClient {
+    private SdncProperties sdncProperties;
+    private RestTemplate restTemplate;
+
+    public SdncRestconfClient(final SdncProperties sdncProperties, final RestTemplate restTemplate) {
+        this.sdncProperties = sdncProperties;
+        this.restTemplate = restTemplate;
+    }
+
+    /**
+     * restconf get operation on sdnc.
+     *
+     * @param getResourceUrl sdnc get url
+     *
+     * @return the response entity
+     */
+    public ResponseEntity<String> getOperation(final String getResourceUrl) {
+        final String sdncBaseUrl = sdncProperties.getBaseUrl();
+        final String sdncRestconfUrl = sdncBaseUrl.concat(getResourceUrl);
+        final var httpHeaders = new HttpHeaders();
+        httpHeaders.setBasicAuth(sdncProperties.getAuthUsername(), sdncProperties.getAuthPassword());
+        httpHeaders.set(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON.toString());
+        final var httpEntity = new HttpEntity<>(httpHeaders);
+        return restTemplate.getForEntity(sdncRestconfUrl, String.class, httpEntity);
+    }
+}
diff --git a/src/main/java/org/onap/cps/ncmp/dmi/service/operation/SdncOperations.java b/src/main/java/org/onap/cps/ncmp/dmi/service/operation/SdncOperations.java
new file mode 100644
index 00000000..4e4e7217
--- /dev/null
+++ b/src/main/java/org/onap/cps/ncmp/dmi/service/operation/SdncOperations.java
@@ -0,0 +1,75 @@
+/*
+ *  ============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.cps.ncmp.dmi.service.operation;
+
+import org.jetbrains.annotations.NotNull;
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration.SdncProperties;
+import org.onap.cps.ncmp.dmi.service.client.SdncRestconfClient;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Component;
+
+@Component
+public class SdncOperations {
+
+    private static final String TOPOLOGY_URL_TEMPLATE = "/rests/data/network-topology:network-topology"
+            + "/topology={topologyId}";
+    private static final String MOUNT_URL_TEMPLATE = "/node={nodeId}/yang-ext:mount";
+    private static final String GET_SCHEMA_URL = "/ietf-netconf-monitoring:netconf-state/schemas";
+
+    private SdncProperties sdncProperties;
+    private SdncRestconfClient sdncRestconfClient;
+    private final String topologyUrl;
+    private final String topologyMountUrlTemplate;
+
+    /**
+     * Constructor for {@code SdncOperations}. This method also manipulates
+     * url properties.
+     *
+     * @param sdncProperties {@code SdncProperties}
+     * @param sdncRestconfClient {@code SdncRestconfClient}
+     */
+
+    public SdncOperations(final SdncProperties sdncProperties, final SdncRestconfClient sdncRestconfClient) {
+        this.sdncProperties = sdncProperties;
+        this.sdncRestconfClient = sdncRestconfClient;
+        topologyUrl = TOPOLOGY_URL_TEMPLATE.replace("{topologyId}", this.sdncProperties.getTopologyId());
+        topologyMountUrlTemplate = topologyUrl + MOUNT_URL_TEMPLATE;
+    }
+
+    /**
+     * This method fetches list of modules usind sdnc client.
+     *
+     * @param nodeId node id for node
+     * @return returns {@code ResponseEntity} which contains list of modules
+     */
+    public ResponseEntity<String> getModulesFromNode(final String nodeId) {
+        final String urlWithNodeId = prepareGetSchemaUrl(nodeId);
+        return sdncRestconfClient.getOperation(urlWithNodeId);
+    }
+
+    @NotNull
+    private String prepareGetSchemaUrl(final String nodeId) {
+        final String topologyMountUrl = topologyMountUrlTemplate;
+        final String topologyMountUrlWithNodeId = topologyMountUrl.replace("{nodeId}", nodeId);
+        final String resourceUrl = topologyMountUrlWithNodeId.concat(GET_SCHEMA_URL);
+        return resourceUrl;
+    }
+}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 6a0cf975..408fc103 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -53,4 +53,11 @@ cps-core:
   dmiRegistrationUrl : /cps-ncmp/api/ncmp-dmi/v1/ch
   auth:
     username: ${CPS_CORE_USERNAME}
-    password: ${CPS_CORE_PASSWORD}
\ No newline at end of file
+    password: ${CPS_CORE_PASSWORD}
+
+sdnc:
+  baseUrl: http://${SDNC_HOST}:${SDNC_PORT}
+  topologyId: ${SDNC_TOPOLOGY_ID:topology-netconf}
+  auth:
+    username: ${SDNC_USERNAME}
+    password: ${SDNC_PASSWORD}
diff --git a/src/test/groovy/org/onap/cps/ncmp/dmi/rest/controller/DmiRestControllerSpec.groovy b/src/test/groovy/org/onap/cps/ncmp/dmi/rest/controller/DmiRestControllerSpec.groovy
index f8b4c015..f249de92 100644
--- a/src/test/groovy/org/onap/cps/ncmp/dmi/rest/controller/DmiRestControllerSpec.groovy
+++ b/src/test/groovy/org/onap/cps/ncmp/dmi/rest/controller/DmiRestControllerSpec.groovy
@@ -20,19 +20,21 @@
 
 package org.onap.cps.ncmp.dmi.rest.controller
 
+import org.onap.cps.ncmp.dmi.exception.DmiException
+import org.onap.cps.ncmp.dmi.exception.ModulesNotFoundException
 import org.onap.cps.ncmp.dmi.service.DmiService
-
-import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get
-
 import org.spockframework.spring.SpringBean
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
-import org.springframework.http.HttpStatus
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.beans.factory.annotation.Value
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest
+import org.springframework.http.HttpStatus
+import org.springframework.http.MediaType
 import org.springframework.test.web.servlet.MockMvc
 import spock.lang.Specification
 
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post
+
 @WebMvcTest
 @AutoConfigureMockMvc(addFilters = false)
 class DmiRestControllerSpec extends Specification {
@@ -43,22 +45,40 @@ class DmiRestControllerSpec extends Specification {
     @Autowired
     private MockMvc mvc
 
-    @Value('${rest.api.dmi-base-path}')
-    def basePath
-
-    def 'Get Hello World'() {
-        given: 'hello world endpoint'
-            def helloWorldEndpoint = "$basePath/v1/helloworld"
+    @Value('${rest.api.dmi-base-path}/v1')
+    def basePathV1
 
-        when: 'get hello world api is invoked'
-            def response = mvc.perform(
-                                    get(helloWorldEndpoint)
-                           ).andReturn().response
-
-        then: 'Response Status is OK and contains expected text'
+    def 'Get all modules for given cm handle.'() {
+        given: 'REST endpoint for getting all modules'
+            def getModuleUrl = "$basePathV1/ch/node1/modules"
+        and: 'get modules for cm-handle returns a json'
+            def someJson = 'some-json'
+            mockDmiService.getModulesForCmHandle('node1') >> someJson
+        when: 'post is being called'
+            def response = mvc.perform( post(getModuleUrl)
+                            .contentType(MediaType.APPLICATION_JSON))
+                            .andReturn().response
+        then: 'status is OK'
             response.status == HttpStatus.OK.value()
-        then: 'the java API was called with the correct parameters'
-            1 * mockDmiService.getHelloWorld()
+        and: 'the response content matches the result from the DMI service'
+            response.getContentAsString() == someJson
     }
 
+    def 'Get all modules for given cm handle with exception handling of #scenario.'() {
+        given: 'REST endpoint for getting all modules'
+            def getModuleUrl = "$basePathV1/ch/node1/modules"
+        and: 'get modules for cm-handle throws #exceptionClass'
+            mockDmiService.getModulesForCmHandle('node1') >> { throw Mock(exceptionClass) }
+        when: 'post is invoked'
+            def response = mvc.perform( post(getModuleUrl)
+                    .contentType(MediaType.APPLICATION_JSON))
+                    .andReturn().response
+        then: 'response status is #expectedResponse'
+            response.status == expectedResponse
+        where: 'the scenario is #scenario'
+            scenario                       |  exceptionClass                 || expectedResponse
+            'dmi service exception'        |  DmiException.class             || HttpStatus.INTERNAL_SERVER_ERROR.value()
+            'no modules found'             |  ModulesNotFoundException.class || HttpStatus.NOT_FOUND.value()
+            'any other runtime exception'  |  RuntimeException.class         || HttpStatus.INTERNAL_SERVER_ERROR.value()
+    }
 }
diff --git a/src/test/groovy/org/onap/cps/ncmp/dmi/service/DmiServiceImplSpec.groovy b/src/test/groovy/org/onap/cps/ncmp/dmi/service/DmiServiceImplSpec.groovy
index 2124c9b4..66612960 100644
--- a/src/test/groovy/org/onap/cps/ncmp/dmi/service/DmiServiceImplSpec.groovy
+++ b/src/test/groovy/org/onap/cps/ncmp/dmi/service/DmiServiceImplSpec.groovy
@@ -20,15 +20,54 @@
 
 package org.onap.cps.ncmp.dmi.service
 
-
+import org.onap.cps.ncmp.dmi.exception.DmiException
+import org.onap.cps.ncmp.dmi.exception.ModulesNotFoundException
+import org.onap.cps.ncmp.dmi.service.operation.SdncOperations
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
 import spock.lang.Specification
 
 class DmiServiceImplSpec extends Specification {
+
     def objectUnderTest = new DmiServiceImpl()
 
-    def 'Retrieve Hello World'() {
-        expect: 'Hello World is Returned'
-            objectUnderTest.getHelloWorld() == 'Hello World'
+    def mockSdncOperations = Mock(SdncOperations)
+
+    def setup() {
+        objectUnderTest.sdncOperations = mockSdncOperations
+    }
+
+    def 'Call get modules for cm-handle on dmi Service.'() {
+        given: 'cm handle id'
+            def cmHandle = 'node1'
+        and: 'request operation returns OK'
+            def body = 'body'
+            mockSdncOperations.getModulesFromNode(cmHandle) >> new ResponseEntity<String>(body, HttpStatus.OK)
+        when: 'get modules for cm-handle is called'
+            def result = objectUnderTest.getModulesForCmHandle(cmHandle)
+        then: 'result is equal to the response from the SDNC service'
+            result == body
+    }
+
+    def 'Call get modules for cm-handle and SDNC returns "bad request" status.'() {
+        given: 'cm handle id'
+            def cmHandle = 'node1'
+        and: 'get modules from node returns "bad request" status'
+            mockSdncOperations.getModulesFromNode(cmHandle) >> new ResponseEntity<String>('body', HttpStatus.BAD_REQUEST)
+        when: 'get modules for cm-handle is called'
+            objectUnderTest.getModulesForCmHandle(cmHandle)
+        then: 'dmi exception is thrown'
+            thrown( DmiException )
     }
 
+    def 'Call get modules for cm-handle and SDNC returns OK with empty body.'() {
+        given: 'cm handle id'
+            def cmHandle = 'node1'
+        and: 'get modules for cm-handle returns OK with empty body'
+            mockSdncOperations.getModulesFromNode(cmHandle) >> new ResponseEntity<String>('', HttpStatus.OK)
+        when: 'get modules for cm-handle is called'
+            objectUnderTest.getModulesForCmHandle(cmHandle)
+        then: 'ModulesNotFoundException is thrown'
+            thrown( ModulesNotFoundException )
+    }
 }
diff --git a/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/NcmpRestClientSpec.groovy b/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/NcmpRestClientSpec.groovy
index 4f929865..f5c059c7 100644
--- a/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/NcmpRestClientSpec.groovy
+++ b/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/NcmpRestClientSpec.groovy
@@ -20,14 +20,14 @@
 
 package org.onap.cps.ncmp.dmi.service.client
 
-import org.onap.cps.ncmp.dmi.config.CpsConfiguration
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration
 import org.springframework.http.ResponseEntity
 import org.springframework.web.client.RestTemplate
 import spock.lang.Specification
 
 class NcmpRestClientSpec extends Specification {
     def objectUnderTest = new NcmpRestClient(mockCpsProperties, mockRestTemplate)
-    def mockCpsProperties = Mock(CpsConfiguration.CpsProperties)
+    def mockCpsProperties = Mock(DmiConfiguration.CpsProperties)
     def mockRestTemplate = Mock(RestTemplate)
 
     def setup() {
@@ -45,12 +45,12 @@ class NcmpRestClientSpec extends Specification {
             mockCpsProperties.authPassword >> 'some-password'
         and: 'the rest template returns a valid response entity'
             def mockResponseEntity = Mock(ResponseEntity)
-        when: 'registerCmHandle is invoked'
+        when: 'register cm-handle with ncmp is invoked'
             def result = objectUnderTest.registerCmHandlesWithNcmp(jsonData)
         then: 'the rest template is called with the correct uri and json in the body'
             1 * mockRestTemplate.postForEntity({ it.toString() == 'http://some-uri/some-url' },
                     { it.body.contains(jsonData) }, String.class) >> mockResponseEntity
-        and: 'the output of the method is the same as the output from the test template'
+        and: 'the output of the method is equal to the output from the test template'
             result == mockResponseEntity
     }
 }
\ No newline at end of file
diff --git a/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClientSpec.groovy b/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClientSpec.groovy
new file mode 100644
index 00000000..0b192f05
--- /dev/null
+++ b/src/test/groovy/org/onap/cps/ncmp/dmi/service/client/SdncRestconfClientSpec.groovy
@@ -0,0 +1,52 @@
+/*
+ *  ============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.cps.ncmp.dmi.service.client
+
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration
+import org.springframework.http.HttpEntity
+import org.springframework.http.HttpMethod
+import org.springframework.http.ResponseEntity
+import org.springframework.web.client.RestTemplate
+import spock.lang.Specification
+
+class SdncRestconfClientSpec extends Specification {
+
+    def mockSdncProperties = Mock(DmiConfiguration.SdncProperties)
+    def mockRestTemplate = Mock(RestTemplate)
+    def objectUnderTest = new SdncRestconfClient(mockSdncProperties, mockRestTemplate)
+
+    def 'SDNC GET operation.'() {
+        given: 'a get url'
+            def getResourceUrl = '/getResourceUrl'
+        and: 'sdnc properties'
+            mockSdncProperties.baseUrl >> 'http://test-sdnc-uri'
+            mockSdncProperties.authUsername >> 'test-username'
+            mockSdncProperties.authPassword >> 'test-password'
+            mockSdncProperties.topologyId >> 'testTopologyId'
+        and: 'the rest template returns a valid response entity'
+            def mockResponseEntity = Mock(ResponseEntity)
+            mockRestTemplate.getForEntity({ it.toString() == 'http://test-sdnc-uri/getResourceUrl' }, String.class, _ as HttpEntity) >> mockResponseEntity
+        when: 'GET operation is invoked'
+            def result = objectUnderTest.getOperation(getResourceUrl)
+        then: 'the output of the method is equal to the output from the test template'
+            result == mockResponseEntity
+    }
+}
\ No newline at end of file
diff --git a/src/test/groovy/org/onap/cps/ncmp/dmi/service/operation/SdncOperationsSpec.groovy b/src/test/groovy/org/onap/cps/ncmp/dmi/service/operation/SdncOperationsSpec.groovy
new file mode 100644
index 00000000..956834ad
--- /dev/null
+++ b/src/test/groovy/org/onap/cps/ncmp/dmi/service/operation/SdncOperationsSpec.groovy
@@ -0,0 +1,44 @@
+/*
+ *  ============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.cps.ncmp.dmi.service.operation
+
+import org.onap.cps.ncmp.dmi.config.DmiConfiguration
+import org.onap.cps.ncmp.dmi.service.client.SdncRestconfClient
+import org.springframework.http.HttpStatus
+import org.springframework.http.ResponseEntity
+import spock.lang.Specification
+
+class SdncOperationsSpec extends  Specification {
+    def mockSdncProperties = Mock(DmiConfiguration.SdncProperties)
+    def mockSdncRestClient = Mock(SdncRestconfClient)
+
+    def 'call get modules from node to SDNC.'() {
+        given: 'nodeid, topology-id, responseentity'
+            def nodeId = 'node1'
+            def expectedUrl = '/rests/data/network-topology:network-topology/topology=test-topology/node=node1/yang-ext:mount/ietf-netconf-monitoring:netconf-state/schemas'
+            mockSdncProperties.getTopologyId() >> 'test-topology'
+            def objectUnderTest = new SdncOperations(mockSdncProperties, mockSdncRestClient)
+        when: 'called get modules from node'
+            objectUnderTest.getModulesFromNode(nodeId)
+        then: 'the get operation is executed with the correct URL'
+            1 * mockSdncRestClient.getOperation(expectedUrl)
+    }
+}