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/*
* ============LICENSE_START=======================================================
* BBS-RELOCATION-CPE-AUTHENTICATION-HANDLER
* ================================================================================
* Copyright (C) 2019 NOKIA Intellectual Property. 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.bbs.event.processor.utilities;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.COMMON_FORMAT;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.CORRELATION_ID;
import static org.onap.bbs.event.processor.utilities.ReRegistrationEventFields.ADDITIONAL_FIELDS;
import static org.onap.bbs.event.processor.utilities.ReRegistrationEventFields.ATTACHMENT_POINT;
import static org.onap.bbs.event.processor.utilities.ReRegistrationEventFields.CVLAN;
import static org.onap.bbs.event.processor.utilities.ReRegistrationEventFields.REMOTE_ID;
import static org.onap.bbs.event.processor.utilities.ReRegistrationEventFields.SVLAN;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import java.util.Optional;
import java.util.stream.StreamSupport;
import org.onap.bbs.event.processor.exceptions.DmaapException;
import org.onap.bbs.event.processor.model.ImmutableReRegistrationConsumerDmaapModel;
import org.onap.bbs.event.processor.model.ReRegistrationConsumerDmaapModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
public class ReRegistrationDmaapConsumerJsonParser {
private static final Logger LOGGER = LoggerFactory.getLogger(ReRegistrationDmaapConsumerJsonParser.class);
private static final Gson gson = new Gson();
private static final String RE_REGISTRATION_DUMPING_TEMPLATE = "%n{"
+ "\"" + CORRELATION_ID + COMMON_FORMAT + ","
+ "\"" + ATTACHMENT_POINT + COMMON_FORMAT + ","
+ "\"" + REMOTE_ID + COMMON_FORMAT + ","
+ "\"" + CVLAN + COMMON_FORMAT + ","
+ "\"" + SVLAN + COMMON_FORMAT
+ "}";
private String pnfCorrelationId;
private String attachmentPoint;
private String remoteId;
private String cvlan;
private String svlan;
/**
* Translates a response from DMaaP to a reactive {@link ReRegistrationConsumerDmaapModel} model.
* @param dmaapResponse Response from DMaaP
* @return Re-Registration Consumer DMaaP reactive model
*/
public Flux<ReRegistrationConsumerDmaapModel> extractModelFromDmaap(Mono<String> dmaapResponse) {
return dmaapResponse
.flatMapMany(this::parseToMono)
.flatMap(this::createTargetFlux);
}
private Mono<JsonElement> parseToMono(String message) {
if (StringUtils.isEmpty(message)) {
LOGGER.warn("DMaaP response is empty");
return Mono.empty();
}
return Mono.fromCallable(() -> new JsonParser().parse(message))
.doOnError(e -> e instanceof JsonSyntaxException, e -> LOGGER.error("Invalid JSON. Ignoring"))
.onErrorResume(e -> e instanceof JsonSyntaxException, e -> Mono.empty());
}
private Flux<ReRegistrationConsumerDmaapModel> createTargetFlux(JsonElement jsonElement) {
if (jsonElement.isJsonObject()) {
return doCreateTargetFlux(Flux.defer(() -> Flux.just(jsonElement.getAsJsonObject())));
}
return doCreateTargetFlux(
Flux.defer(() -> Flux.fromStream(StreamSupport.stream(jsonElement.getAsJsonArray().spliterator(), false)
.map(jsonElementFromArray -> getJsonObjectFromAnArray(jsonElementFromArray)
.orElseGet(JsonObject::new)))));
}
private Flux<ReRegistrationConsumerDmaapModel> doCreateTargetFlux(Flux<JsonObject> jsonObject) {
return jsonObject
.flatMap(this::transform)
.onErrorResume(exception -> exception instanceof DmaapException, e -> Mono.empty());
}
private Mono<ReRegistrationConsumerDmaapModel> transform(JsonObject dmaapResponseJsonObject) {
LOGGER.trace("Event from DMaaP to be parsed: \n{}", gson.toJson(dmaapResponseJsonObject));
if (!containsProperHeaders(dmaapResponseJsonObject)) {
LOGGER.warn("Incorrect JsonObject - missing headers");
return Mono.empty();
}
JsonObject pnfReRegistrationFields =
dmaapResponseJsonObject.getAsJsonObject(ADDITIONAL_FIELDS);
pnfCorrelationId = getValueFromJson(dmaapResponseJsonObject, CORRELATION_ID);
attachmentPoint = getValueFromJson(pnfReRegistrationFields, ATTACHMENT_POINT);
remoteId = getValueFromJson(pnfReRegistrationFields, REMOTE_ID);
cvlan = getValueFromJson(pnfReRegistrationFields, CVLAN);
svlan = getValueFromJson(pnfReRegistrationFields, SVLAN);
if (StringUtils.isEmpty(pnfCorrelationId) || anyImportantPropertyMissing()) {
String incorrectEvent = dumpJsonData();
LOGGER.warn("Incorrect Re-Registration JSON event: {}", incorrectEvent);
return Mono.empty();
}
return Mono.just(ImmutableReRegistrationConsumerDmaapModel.builder()
.correlationId(pnfCorrelationId)
.attachmentPoint(attachmentPoint)
.remoteId(remoteId)
.cVlan(cvlan)
.sVlan(svlan)
.build());
}
private boolean anyImportantPropertyMissing() {
return StringUtils.isEmpty(attachmentPoint)
|| StringUtils.isEmpty(remoteId)
|| StringUtils.isEmpty(cvlan)
|| StringUtils.isEmpty(svlan);
}
private boolean containsProperHeaders(JsonObject jsonObject) {
return jsonObject.has(ADDITIONAL_FIELDS);
}
private String dumpJsonData() {
return String.format(RE_REGISTRATION_DUMPING_TEMPLATE,
pnfCorrelationId,
attachmentPoint,
remoteId,
cvlan,
svlan
);
}
Optional<JsonObject> getJsonObjectFromAnArray(JsonElement element) {
JsonParser jsonParser = new JsonParser();
return element.isJsonPrimitive() ? Optional.of(jsonParser.parse(element.getAsString()).getAsJsonObject())
: Optional.of(jsonParser.parse(element.toString()).getAsJsonObject());
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
}
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