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/*
 * Copyright DataStax, Inc.
 *
 * 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.datastax.oss.simulacron.server;

import com.datastax.oss.protocol.internal.Frame;
import com.datastax.oss.protocol.internal.FrameCodec;
import com.datastax.oss.protocol.internal.ProtocolConstants;
import com.datastax.oss.protocol.internal.response.Error;
import com.datastax.oss.simulacron.common.utils.FrameUtils;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageEncoder;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class FrameEncoder extends MessageToMessageEncoder {

  private static Logger logger = LoggerFactory.getLogger(FrameEncoder.class);

  private final FrameCodec frameCodec;

  FrameEncoder(FrameCodec frameCodec) {
    this.frameCodec = frameCodec;
  }

  @Override
  protected void encode(ChannelHandlerContext ctx, Frame msg, List out) {
    try {
      out.add(frameCodec.encode(msg));
    } catch (Throwable t) {
      logger.error("Exception while encoding a frame. Returning a server error instead.", t);
      out.add(
          frameCodec.encode(
              FrameUtils.convertResponseMessage(
                  msg, new Error(ProtocolConstants.ErrorCode.SERVER_ERROR, t.toString()))));
    }
  }
}