ExceptionHandler.java

/*
 * Copyright 2015 Kevin Herron
 *
 * 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 com.digitalpetri.opcua.stack.core.channel;

import com.digitalpetri.opcua.stack.core.StatusCodes;
import com.digitalpetri.opcua.stack.core.UaException;
import com.digitalpetri.opcua.stack.core.UaRuntimeException;
import com.digitalpetri.opcua.stack.core.channel.messages.ErrorMessage;
import com.digitalpetri.opcua.stack.core.channel.messages.TcpMessageEncoder;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;

public class ExceptionHandler {

    public static ErrorMessage sendErrorMessage(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        String message = cause.getMessage();
        long statusCode = StatusCodes.Bad_UnexpectedError;

        if (cause instanceof UaException) {
            UaException ex = (UaException) cause;
            message = ex.getMessage();
            statusCode = ex.getStatusCode().getValue();
        } else {
            Throwable innerCause = cause.getCause();

            if (innerCause instanceof UaException) {
                UaException ex = (UaException) innerCause;
                message = ex.getMessage();
                statusCode = ex.getStatusCode().getValue();
            } else if (innerCause instanceof UaRuntimeException) {
                UaRuntimeException ex = (UaRuntimeException) innerCause;
                message = ex.getMessage();
                statusCode = ex.getStatusCode();
            }
        }

        ErrorMessage error = new ErrorMessage(statusCode, message);
        ByteBuf messageBuffer = TcpMessageEncoder.encode(error);

        ctx.writeAndFlush(messageBuffer).addListener(future -> ctx.close());

        return error;
    }

}