2 * ========================LICENSE_START=================================
5 * Copyright (C) 2019 AT&T Intellectual Property
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ========================LICENSE_END===================================
20 package org.oransc.ric.portal.dashboard.controller;
22 import java.lang.invoke.MethodHandles;
24 import org.oransc.ric.portal.dashboard.model.ErrorTransport;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
27 import org.springframework.http.HttpStatus;
28 import org.springframework.http.ResponseEntity;
29 import org.springframework.web.bind.annotation.ControllerAdvice;
30 import org.springframework.web.bind.annotation.ExceptionHandler;
31 import org.springframework.web.client.HttpStatusCodeException;
32 import org.springframework.web.client.RestClientResponseException;
33 import org.springframework.web.context.request.WebRequest;
34 import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
37 * Catches certain exceptions. This controller advice factors out try-catch
38 * blocks in many controller methods.
41 * https://www.baeldung.com/exception-handling-for-rest-with-spring
42 * https://www.springboottutorial.com/spring-boot-exception-handling-for-rest-services
45 public class CustomResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
47 // Superclass has "logger" that is exposed here, so use a different name
48 private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
51 * Logs the error and generates a JSON response when a REST controller method
52 * takes a RestClientResponseException. This is thrown by the Http client when a
53 * remote method returns a non-2xx code. All the controller methods are proxies
54 * in that they just forward the request along to a remote system, so if that
55 * remote system fails, return 502 plus some details about the failure, rather
56 * than the generic 500 that Spring-Boot will return on an uncaught exception.
58 * Why 502? I quote: <blockquote>HTTP server received an invalid response from a
59 * server it consulted when acting as a proxy or gateway.</blockquote>
65 * The original request
67 * @return A response entity with status code 502 plus some details in the body.
69 @ExceptionHandler({ RestClientResponseException.class })
70 public final ResponseEntity<ErrorTransport> handleProxyMethodException(Exception ex, WebRequest request) {
71 // Capture the full stack trace in the log.
72 log.error("handleProxyMethodException: request {}, exception {}", request.getDescription(false), ex);
73 if (ex instanceof HttpStatusCodeException) {
74 HttpStatusCodeException hsce = (HttpStatusCodeException) ex;
75 return new ResponseEntity<>(new ErrorTransport(hsce.getRawStatusCode(), hsce.getResponseBodyAsString(),
76 ex.toString(), request.getDescription(false)), HttpStatus.BAD_GATEWAY);
78 return new ResponseEntity<>(new ErrorTransport(500, ex), HttpStatus.BAD_GATEWAY);