com.netflix.eureka2.client.transport.http.HttpErrorHandler Maven / Gradle / Ivy

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/*
 * Copyright 2014 Netflix, 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.netflix.eureka2.client.transport.http;

import com.netflix.eureka2.client.transport.CommunicationFailure;
import com.netflix.eureka2.client.transport.CommunicationFailure.Reason;
import io.reactivex.netty.protocol.http.client.HttpClientResponse;
import rx.Observable.Operator;
import rx.Subscriber;

import java.io.IOException;

/**
 * FIXME It is rough approximation of HTTP error handling.
 *
 * @author Tomasz Bak
 */
public class HttpErrorHandler implements Operator, HttpClientResponse> {

    @Override
    public Subscriber> call(final Subscriber> subscriber) {
        return new Subscriber>() {
            @Override
            public void onCompleted() {
                subscriber.onCompleted();
            }

            @Override
            public void onError(Throwable e) {
                if (e instanceof IOException) {
                    subscriber.onError(new CommunicationFailure("Communication failure", Reason.Permanent, e));
                }
                // FIXME Does it make sense to return 'permanent' after a few consecutive errors are received?
                subscriber.onError(new CommunicationFailure(" ", Reason.Temporary, e));
            }

            @Override
            public void onNext(HttpClientResponse response) {
                int status = response.getStatus().code();
                if (status / 100 == 2) {
                    subscriber.onNext(response);
                } else {
                    String message = "HTTP request failed with status code " + response.getStatus();
                    if (status / 100 == 5 && status != 503) {
                        subscriber.onError(new CommunicationFailure(message, Reason.Permanent));
                    } else {
                        subscriber.onError(new CommunicationFailure(message, Reason.Temporary));
                    }
                }
            }
        };
    }
}