org.springframework.web.server.handler.ResponseStatusExceptionHandler Maven / Gradle / Ivy
/*
* Copyright 2002-2020 the original author or authors.
*
* 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
*
* https://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.springframework.web.server.handler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebExceptionHandler;
/**
* Handle {@link ResponseStatusException} by setting the response status.
*
* By default exception stack traces are not shown for successfully resolved
* exceptions. Use {@link #setWarnLogCategory(String)} to enable logging with
* stack traces.
*
* @author Rossen Stoyanchev
* @author Sebastien Deleuze
* @since 5.0
*/
public class ResponseStatusExceptionHandler implements WebExceptionHandler {
private static final Log logger = LogFactory.getLog(ResponseStatusExceptionHandler.class);
@Nullable
private Log warnLogger;
/**
* Set the log category for warn logging.
*
Default is no warn logging. Specify this setting to activate warn
* logging into a specific category.
* @since 5.1
* @see org.apache.commons.logging.LogFactory#getLog(String)
* @see java.util.logging.Logger#getLogger(String)
*/
public void setWarnLogCategory(String loggerName) {
this.warnLogger = LogFactory.getLog(loggerName);
}
@Override
public Mono handle(ServerWebExchange exchange, Throwable ex) {
if (!updateResponse(exchange.getResponse(), ex)) {
return Mono.error(ex);
}
// Mirrors AbstractHandlerExceptionResolver in spring-webmvc...
String logPrefix = exchange.getLogPrefix();
if (this.warnLogger != null && this.warnLogger.isWarnEnabled()) {
this.warnLogger.warn(logPrefix + formatError(ex, exchange.getRequest()), ex);
}
else if (logger.isDebugEnabled()) {
logger.debug(logPrefix + formatError(ex, exchange.getRequest()));
}
return exchange.getResponse().setComplete();
}
private String formatError(Throwable ex, ServerHttpRequest request) {
String reason = ex.getClass().getSimpleName() + ": " + ex.getMessage();
String path = request.getURI().getRawPath();
return "Resolved [" + reason + "] for HTTP " + request.getMethod() + " " + path;
}
private boolean updateResponse(ServerHttpResponse response, Throwable ex) {
boolean result = false;
HttpStatus status = determineStatus(ex);
if (status != null) {
if (response.setStatusCode(status)) {
if (ex instanceof ResponseStatusException) {
((ResponseStatusException) ex).getResponseHeaders()
.forEach((name, values) ->
values.forEach(value -> response.getHeaders().add(name, value)));
}
result = true;
}
}
else {
Throwable cause = ex.getCause();
if (cause != null) {
result = updateResponse(response, cause);
}
}
return result;
}
/**
* Determine the HTTP status implied by the given exception.
* @param ex the exception to introspect
* @return the associated HTTP status, if any
* @since 5.0.5
*/
@Nullable
protected HttpStatus determineStatus(Throwable ex) {
if (ex instanceof ResponseStatusException) {
return ((ResponseStatusException) ex).getStatus();
}
return null;
}
}