content: /*
   * Copyright The OpenTelemetry Authors
   * SPDX-License-Identifier: Apache-2.0
   */
  
  // Includes work from:
  /*
   * Copyright 2014 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
   *
   *    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 io.opentelemetry.instrumentation.ratpack.v1_7.internal;
  
  import static java.util.logging.Level.WARNING;
  
  import java.util.logging.Logger;
  import ratpack.error.ClientErrorHandler;
  import ratpack.error.ServerErrorHandler;
  import ratpack.handling.Context;
  
  // Copied from
  // https://github.com/ratpack/ratpack/blob/master/ratpack-core/src/main/java/ratpack/core/error/internal/DefaultProductionErrorHandler.java
  // since it is internal and has had breaking changes.
  /**
   * This class is internal and is hence not for public use. Its APIs are unstable and can change at
   * any time.
   */
  final class OpenTelemetryFallbackErrorHandler implements ClientErrorHandler, ServerErrorHandler {
  
    static final OpenTelemetryFallbackErrorHandler INSTANCE = new OpenTelemetryFallbackErrorHandler();
  
    private static final Logger logger =
        Logger.getLogger(OpenTelemetryFallbackErrorHandler.class.getName());
  
    OpenTelemetryFallbackErrorHandler() {}
  
    @Override
    public void error(Context context, int statusCode) {
      if (logger.isLoggable(WARNING)) {
        WarnOnce.execute();
        logger.warning(getMsg(ClientErrorHandler.class, "client error", context));
      }
      context.getResponse().status(statusCode).send();
    }
  
    @Override
    public void error(Context context, Throwable throwable) {
      if (logger.isLoggable(WARNING)) {
        WarnOnce.execute();
        logger.log(
            WARNING, getMsg(ServerErrorHandler.class, "server error", context) + "\n", throwable);
      }
      context.getResponse().status(500).send();
    }
  
    private static String getMsg(Class<?> handlerClass, String type, Context context) {
      return "Default production error handler used to render "
          + type
          + ", please add a "
          + handlerClass.getName()
          + " instance to your application "
          + "(method: "
          + context.getRequest().getMethod()
          + ", uri: "
          + context.getRequest().getRawUri()
          + ")";
    }
  
    private static class WarnOnce {
      static {
        logger.warning(
            "Logging error using OpenTelemetryFallbackErrorHandler. This indicates "
                + "OpenTelemetry could not find a registered error handler which is not expected. "
                + "Log messages will only be outputted to console.");
      }
  
      // Warned once in static initializer, this is just to trigger classload.
      static void execute() {}
    }
  }
  