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A CallAdapter.Factory for Project Reactor types.
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/*
 * Copyright (C) 2016 Jake Wharton
 *
 * 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.jakewharton.retrofit2.adapter.reactor;

import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Operators;
import reactor.util.context.Context;
import retrofit2.HttpException;
import retrofit2.Response;

final class BodyFlux extends Flux {
  private final Publisher> upstream;

  BodyFlux(Publisher> upstream) {
    this.upstream = upstream;
  }

  @Override public void subscribe(CoreSubscriber subscriber) {
    upstream.subscribe(new BodySubscriber<>(subscriber));
  }

  private static class BodySubscriber implements Subscriber> {
    private final Subscriber subscriber;
    /** Indicates whether a terminal event has been sent to {@link #subscriber}. */
    private boolean subscriberTerminated;

    BodySubscriber(Subscriber subscriber) {
      this.subscriber = subscriber;
    }

    @Override public void onSubscribe(Subscription subscription) {
      subscriber.onSubscribe(subscription);
    }

    @Override public void onNext(Response response) {
      if (response.isSuccessful()) {
        subscriber.onNext(response.body());
      } else {
        subscriberTerminated = true;
        Throwable t = new HttpException(response);
        try {
          subscriber.onError(t);
        } catch (Throwable inner) {
          Operators.onErrorDropped(inner, Context.empty());
        }
      }
    }

    @Override public void onError(Throwable throwable) {
      if (!subscriberTerminated) {
        subscriber.onError(throwable);
      } else {
        // This should never happen! onNext handles and forwards errors automatically.
        Throwable broken = new AssertionError(
            "This should never happen! Report as a Retrofit bug with the full stacktrace.",
            throwable);
        Operators.onErrorDropped(broken, Context.empty());
      }
    }

    @Override public void onComplete() {
      if (!subscriberTerminated) {
        subscriber.onComplete();
      }
    }
  }
}