org.apache.flink.runtime.rest.handler.PipelineErrorHandler Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.flink.runtime.rest.handler;
import org.apache.flink.runtime.rest.handler.util.HandlerUtils;
import org.apache.flink.runtime.rest.messages.ErrorResponseBody;
import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler;
import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
import org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpRequest;
import org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
import org.slf4j.Logger;
import java.util.Collections;
import java.util.Map;
import static java.util.Objects.requireNonNull;
/**
* This is the last handler in the pipeline. It logs all error messages.
*/
@ChannelHandler.Sharable
public class PipelineErrorHandler extends SimpleChannelInboundHandler {
/** The logger to which the handler writes the log statements. */
private final Logger logger;
private final Map responseHeaders;
public PipelineErrorHandler(Logger logger, final Map responseHeaders) {
this.logger = requireNonNull(logger);
this.responseHeaders = requireNonNull(responseHeaders);
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, HttpRequest message) {
// we can't deal with this message. No one in the pipeline handled it. Log it.
logger.warn("Unknown message received: {}", message);
HandlerUtils.sendErrorResponse(
ctx,
message,
new ErrorResponseBody("Bad request received."),
HttpResponseStatus.BAD_REQUEST,
Collections.emptyMap());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
logger.warn("Unhandled exception", cause);
HandlerUtils.sendErrorResponse(
ctx,
false,
new ErrorResponseBody("Internal server error: " + cause.getMessage()),
HttpResponseStatus.INTERNAL_SERVER_ERROR,
responseHeaders);
}
}