org.jclouds.digitalocean2.exceptions.DigitalOcean2RateLimitExceededException.java Source code

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Here is the source code for org.jclouds.digitalocean2.exceptions.DigitalOcean2RateLimitExceededException.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.jclouds.digitalocean2.exceptions;

import static org.jclouds.digitalocean2.handlers.DigitalOcean2RateLimitRetryHandler.millisUntilNextAvailableRequest;

import org.jclouds.http.HttpResponse;
import org.jclouds.rest.RateLimitExceededException;

import com.google.common.annotations.Beta;
import com.google.common.base.Predicate;
import com.google.common.collect.Multimap;
import com.google.common.collect.Multimaps;

/**
 * Provides detailed information for rate limit exceptions.
 */
@Beta
public class DigitalOcean2RateLimitExceededException extends RateLimitExceededException {
    private static final long serialVersionUID = 1L;
    private static final String RATE_LIMIT_HEADER_PREFIX = "RateLimit-";

    private Integer totalRequestsPerHour;
    private Integer remainingRequests;
    private Long timeToNextAvailableRequest;

    public DigitalOcean2RateLimitExceededException(HttpResponse response) {
        super(response.getStatusLine() + "\n" + rateLimitHeaders(response));
        parseRateLimitInfo(response);
    }

    public DigitalOcean2RateLimitExceededException(HttpResponse response, Throwable cause) {
        super(response.getStatusLine() + "\n" + rateLimitHeaders(response), cause);
        parseRateLimitInfo(response);
    }

    public Integer totalRequestsPerHour() {
        return totalRequestsPerHour;
    }

    public Integer remainingRequests() {
        return remainingRequests;
    }

    public Long timeToNextAvailableRequest() {
        return timeToNextAvailableRequest;
    }

    private void parseRateLimitInfo(HttpResponse response) {
        String limit = response.getFirstHeaderOrNull("RateLimit-Limit");
        String remaining = response.getFirstHeaderOrNull("RateLimit-Remaining");
        String reset = response.getFirstHeaderOrNull("RateLimit-Reset");

        totalRequestsPerHour = limit == null ? null : Integer.valueOf(limit);
        remainingRequests = remaining == null ? null : Integer.valueOf(remaining);
        timeToNextAvailableRequest = reset == null ? null : millisUntilNextAvailableRequest(Long.parseLong(reset));
    }

    private static Multimap<String, String> rateLimitHeaders(HttpResponse response) {
        return Multimaps.filterKeys(response.getHeaders(), new Predicate<String>() {
            @Override
            public boolean apply(String input) {
                return input.startsWith(RATE_LIMIT_HEADER_PREFIX);
            }
        });
    }
}