ExtApi Listener Implementation

Issue-ID: EXTAPI-204

Change-Id: I0a698068e8c5ea6e3860ff376540b239f7eeb86a
Signed-off-by: akanshad <akansha.dua@amdocs.com>

4 files changed, 168 insertions, 11 deletions

diff --git a/src/main/java/org/onap/nbi/apis/hub/ExtApiClientForHub.java b/src/main/java/org/onap/nbi/apis/hub/ExtApiClientForHub.java
new file mode 100644
index 0000000..10d6f7c
--- /dev/null
+++ b/src/main/java/org/onap/nbi/apis/hub/ExtApiClientForHub.java
@@ -0,0 +1,90 @@
+/**
+ *     Copyright (c) 2019 Amdocs
+ *
+ *     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.
+ */
+package org.onap.nbi.apis.hub;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.onap.nbi.apis.hub.model.Subscription;
+import org.onap.nbi.exceptions.BackendFunctionalException;
+import org.onap.nbi.exceptions.TechnicalException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.*;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.ResourceAccessException;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class ExtApiClientForHub {
+
+    @Autowired
+    RestTemplate restTemplate;
+
+    @Value("${external.nbi.url}")
+    private String externalNbiUrl;
+
+    @Value("${nbi.url}")
+    private String nbiUrl;
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ExtApiClientForHub.class);
+
+    private static final ObjectMapper mapper = new ObjectMapper();
+
+    public ResponseEntity<Object> postEventSubscription(Subscription subscription, String targetURL) {
+        try {
+
+
+            String url = externalNbiUrl.replace("{targetUrl}", targetURL) + "/hub";
+            LOGGER.debug("Sending create event notification request to " + url);
+            String nbiListenerUrl = nbiUrl + "/listener";
+            subscription.setCallback(nbiListenerUrl);
+            String subscriptionAsBody = mapper.writeValueAsString(subscription);
+            ResponseEntity<Object> response = postRequest(url, subscriptionAsBody, buildRequestHeaders());
+            LOGGER.info("Received response from " + targetURL + "with status : " + response.getStatusCode());
+            LOGGER.debug("Response Body: " + response.getBody());
+            return response;
+        }catch(JsonProcessingException ex) {
+            LOGGER.error("error occurred while parsing service order to Json: " + ex);
+            throw new TechnicalException("error occurred while parsing service order to Json:"+ HttpStatus.INTERNAL_SERVER_ERROR);
+        }
+    }
+
+    private HttpHeaders buildRequestHeaders() {
+        HttpHeaders httpHeaders = new HttpHeaders();
+        httpHeaders.add("Accept", "application/json");
+        httpHeaders.add("Content-Type", "application/json");
+        return httpHeaders;
+    }
+
+
+    private ResponseEntity<Object> postRequest(String url, String body, HttpHeaders httpHeaders) {
+        try {
+            ResponseEntity<Object> response = restTemplate.exchange(url, HttpMethod.POST, new HttpEntity<>(body, httpHeaders), Object.class);
+            return response;
+        }catch(BackendFunctionalException ex) {
+            LOGGER.error("error on calling " + url + " ," + ex);
+            return new ResponseEntity<>("problem calling onap services", ex.getHttpStatus());
+        }catch (ResourceAccessException ex) {
+            LOGGER.error("error on calling " + url + " ," + ex);
+            return new ResponseEntity<>("unable to reach onap services", HttpStatus.INTERNAL_SERVER_ERROR);
+
+        }
+
+    }
+}
+
diff --git a/src/main/java/org/onap/nbi/apis/hub/HubResource.java b/src/main/java/org/onap/nbi/apis/hub/HubResource.java
index 016ebca..a37c522 100755
--- a/src/main/java/org/onap/nbi/apis/hub/HubResource.java
+++ b/src/main/java/org/onap/nbi/apis/hub/HubResource.java
@@ -43,6 +43,7 @@ import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseStatus;
 import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RequestHeader;
 
 @RestController
 @RequestMapping("/hub")
@@ -63,22 +64,27 @@ public class HubResource extends ResourceManagement {
   @Autowired
   CheckDMaaPEventsManager checkDMaaPEventMAnager;
 
+  @Autowired
+  ExtApiClientForHub extApiClientForHub;
+
   @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE)
   public ResponseEntity<Object> createEventSubscription(@RequestBody Subscription subscription,
-      @RequestParam MultiValueMap<String, String> params) {
+                                                        @RequestParam MultiValueMap<String, String> params, @RequestHeader(required = false) String targetURL) {
     logger.debug("POST request for subscription : {}", subscription);
-    Subscriber subscriber = subscriptionService.createSubscription(subscription);
-    JsonRepresentation filter = new JsonRepresentation(params);
-    return this.createResponse(Subscription.createFromSubscriber(subscriber), filter);
-
+    if(targetURL != null) {
+      return extApiClientForHub.postEventSubscription(subscription,targetURL);
+    }else {
+      Subscriber subscriber = subscriptionService.createSubscription(subscription);
+      JsonRepresentation filter = new JsonRepresentation(params);
+      return this.createResponse(Subscription.createFromSubscriber(subscriber), filter);
+    }
   }
 
   @GetMapping(value = "/{subscriptionId}", produces = MediaType.APPLICATION_JSON_VALUE)
   public ResponseEntity<Subscription> getSubscription(@PathVariable String subscriptionId) {
 
 
-    Optional<Subscriber> optionalSubscriber =
-        subscriptionService.findSubscriptionById(subscriptionId);
+    Optional<Subscriber> optionalSubscriber = subscriptionService.findSubscriptionById(subscriptionId);
     if (!optionalSubscriber.isPresent()) {
       return ResponseEntity.notFound().build();
     }
@@ -86,8 +92,7 @@ public class HubResource extends ResourceManagement {
   }
 
   @GetMapping(value = "", produces = MediaType.APPLICATION_JSON_VALUE)
-  public ResponseEntity<Object> findSubscribers(
-      @RequestParam MultiValueMap<String, String> params) {
+  public ResponseEntity<Object> findSubscribers(@RequestParam MultiValueMap<String, String> params) {
 
     Query query = multiCriteriaRequestBuilder.buildRequest(params);
     List<Subscriber> subscribers = mongoTemplate.find(query, Subscriber.class);
@@ -96,8 +101,7 @@ public class HubResource extends ResourceManagement {
     HttpHeaders headers = new HttpHeaders();
     headers.add("X-Total-Count", String.valueOf(totalCount));
     headers.add("X-Result-Count", String.valueOf(subscribers.size()));
-    List<Subscription> subscriptions =
-        subscribers.stream().map(Subscription::createFromSubscriber).collect(Collectors.toList());
+    List<Subscription> subscriptions = subscribers.stream().map(Subscription::createFromSubscriber).collect(Collectors.toList());
 
     return this.findResponse(subscriptions, filter, headers);
 
diff --git a/src/main/java/org/onap/nbi/apis/hub/ListenerResource.java b/src/main/java/org/onap/nbi/apis/hub/ListenerResource.java
new file mode 100644
index 0000000..def2ff0
--- /dev/null
+++ b/src/main/java/org/onap/nbi/apis/hub/ListenerResource.java
@@ -0,0 +1,54 @@
+/**
+ *     Copyright (c) 2019 Amdocs
+ *
+ *     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.
+ */
+package org.onap.nbi.apis.hub;
+
+import org.onap.nbi.apis.hub.service.NotificationAspect;
+import org.onap.nbi.commons.ResourceManagement;
+import org.onap.nbi.exceptions.BackendFunctionalException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.MediaType;
+import org.springframework.scheduling.annotation.EnableScheduling;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.onap.nbi.apis.hub.model.Event;
+
+
+
+@RestController
+@RequestMapping("/listener")
+@EnableScheduling
+public class ListenerResource extends ResourceManagement {
+
+    @Autowired
+    NotificationAspect notificationAspect;
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ListenerResource.class);
+
+    @PostMapping(consumes = MediaType.APPLICATION_JSON_VALUE)
+    public void receiveNotification(@RequestBody Event event) {
+        try {
+            LOGGER.debug("Received notification from external NBI || Sending it to original listener");
+            notificationAspect.forwardNotificationToOriginalListener(event);
+        }catch(BackendFunctionalException ex) {
+            LOGGER.error("Unable to send the recieved notification to original Listener");
+
+        }
+    }
+}
diff --git a/src/main/java/org/onap/nbi/apis/hub/service/NotificationAspect.java b/src/main/java/org/onap/nbi/apis/hub/service/NotificationAspect.java
index cd242e8..3033404 100755
--- a/src/main/java/org/onap/nbi/apis/hub/service/NotificationAspect.java
+++ b/src/main/java/org/onap/nbi/apis/hub/service/NotificationAspect.java
@@ -27,6 +27,7 @@ import org.onap.nbi.apis.serviceorder.model.StateType;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Configurable;
 import org.springframework.stereotype.Component;
+import org.onap.nbi.exceptions.TechnicalException;
 
 @Aspect
 @Component
@@ -71,6 +72,14 @@ public class NotificationAspect {
         }
     }
 
+    public void forwardNotificationToOriginalListener(Event event) {
+        if(event != null) {
+            processEvent(event);
+        }else{
+            throw new TechnicalException("Received null event from external NBI");
+        }
+    }
+
     /**
      * Retreive subscribers that match an event and fire notification
      * asynchronously