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Feign Micrometer Application Metrics
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/*
 * Copyright © 2012 The Feign Authors ([email protected])
 *
 * 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 feign.micrometer;

import feign.AsyncClient;
import feign.Capability;
import feign.Client;
import feign.FeignException;
import feign.Response;
import io.micrometer.observation.Observation;
import io.micrometer.observation.ObservationRegistry;

/** Wrap feign {@link Client} with metrics. */
public class MicrometerObservationCapability implements Capability {

  private final ObservationRegistry observationRegistry;

  private final FeignObservationConvention customFeignObservationConvention;

  public MicrometerObservationCapability(
      ObservationRegistry observationRegistry,
      FeignObservationConvention customFeignObservationConvention) {
    this.observationRegistry = observationRegistry;
    this.customFeignObservationConvention = customFeignObservationConvention;
  }

  public MicrometerObservationCapability(ObservationRegistry observationRegistry) {
    this(observationRegistry, null);
  }

  @Override
  public Client enrich(Client client) {
    return (request, options) -> {
      FeignContext feignContext = new FeignContext(request);

      Observation observation =
          FeignObservationDocumentation.DEFAULT
              .observation(
                  this.customFeignObservationConvention,
                  DefaultFeignObservationConvention.INSTANCE,
                  () -> feignContext,
                  this.observationRegistry)
              .start();

      try {
        Response response = client.execute(request, options);
        finalizeObservation(feignContext, observation, null, response);
        return response;
      } catch (FeignException ex) {
        finalizeObservation(feignContext, observation, ex, null);
        throw ex;
      }
    };
  }

  @Override
  public AsyncClient