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Zipkin support for Ratpack

There is a newer version: 2.3.1

/*
 * Copyright 2016 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 ratpack.zipkin.internal;

import com.github.kristofa.brave.ClientResponseAdapter;
import com.github.kristofa.brave.KeyValueAnnotation;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import ratpack.http.client.ReceivedResponse;

import java.util.Collection;
import java.util.Collections;
import zipkin.Constants;
import zipkin.TraceKeys;

class RatpackHttpClientResponseAdapter implements ClientResponseAdapter {
  private final ReceivedResponse response;

  RatpackHttpClientResponseAdapter(final ReceivedResponse response) {
    this.response = response;
  }

  @Override
  public Collection responseAnnotations() {
    if (response != null && response.getStatus() != null) {
      int httpStatus = response.getStatus().getCode();

      List annotations = new LinkedList<>();

      if ((httpStatus < 200) || (httpStatus > 299)) {
        annotations.add(KeyValueAnnotation
            .create(TraceKeys.HTTP_STATUS_CODE, String.valueOf(httpStatus)));
      }

      if (httpStatus > 399) {
        annotations.add(KeyValueAnnotation
            .create(Constants.ERROR, "error status " + httpStatus));
      }

      return annotations;
    } else {
      KeyValueAnnotation statusAnnotation = KeyValueAnnotation
          .create(Constants.ERROR, "missing or unknown status code");

      return Collections.singleton(statusAnnotation);
    }
  }
}