diff options
Diffstat (limited to 'rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/retry/RetryIntervalExtractor.java')
-rw-r--r-- | rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/retry/RetryIntervalExtractor.java | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/retry/RetryIntervalExtractor.java b/rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/retry/RetryIntervalExtractor.java new file mode 100644 index 00000000..0e2c875a --- /dev/null +++ b/rest-services/http-client/src/main/java/org/onap/dcaegen2/services/sdk/rest/services/adapters/http/retry/RetryIntervalExtractor.java @@ -0,0 +1,59 @@ +/* + * ============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); + } +} |