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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2021 Nokia. All rights reserved.
* =========================================================
* 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.
* ============LICENSE_END=====================================
*/
package org.onap.dcaegen2.services.sdk.rest.services.adapters.http.retry;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.vavr.Tuple;
import io.vavr.Value;
import io.vavr.collection.Multimap;
import io.vavr.control.Option;
import io.vavr.control.Try;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
import java.time.Duration;
class RetryIntervalExtractor {
private static final String RETRY_AFTER_HEADER = HttpHeaderNames.RETRY_AFTER.toString();
private static final int PAYLOAD_TOO_LARGE_HTTP_CODE = HttpResponseStatus.REQUEST_ENTITY_TOO_LARGE.code();
Option<Duration> extractDelay(HttpResponse response) {
return response.statusCode() == PAYLOAD_TOO_LARGE_HTTP_CODE
? extractDelay(response.headers())
: Option.none();
}
private Option<Duration> extractDelay(Multimap<String, String> headers) {
return headers
.map((key, value) -> Tuple.of(key.toLowerCase(), value))
.get(RETRY_AFTER_HEADER)
.toStream()
.flatMap(Value::toStream)
.map(this::parse)
.find(d -> d >= 0)
.map(Duration::ofSeconds);
}
private int parse(String str) {
return Try.of(() -> Integer.parseInt(str)).getOrElse(-1);
}
}
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