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/*
* ============LICENSE_START=======================================================
* PNF-REGISTRATION-HANDLER
* ================================================================================
* Copyright (C) 2018 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.dcaegen2.services.prh.service;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.util.Optional;
import java.util.stream.StreamSupport;
import org.onap.dcaegen2.services.prh.exceptions.DmaapNotFoundException;
import org.onap.dcaegen2.services.prh.model.ConsumerDmaapModel;
import org.onap.dcaegen2.services.prh.model.ImmutableConsumerDmaapModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 5/8/18
*/
public class DmaapConsumerJsonParser {
private static final Logger LOGGER = LoggerFactory.getLogger(DmaapConsumerJsonParser.class);
private static final String EVENT = "event";
private static final String COMMON_EVENT_HEADER = "commonEventHeader";
private static final String PNF_REGISTRATION_FIELDS = "pnfRegistrationFields";
private static final String OAM_IPV_4_ADDRESS = "oamV4IpAddress";
private static final String OAM_IPV_6_ADDRESS = "oamV6IpAddress";
private static final String SOURCE_NAME = "sourceName";
private static final String CORRELATION_ID = "correlationId";
/**
* Extract info from string and create @see {@link org.onap.dcaegen2.services.prh.model.ConsumerDmaapModel}.
*
* @param monoMessage - results from DMaaP
* @return reactive DMaaPModel
*/
public Flux<ConsumerDmaapModel> getJsonObject(Mono<String> monoMessage) {
return monoMessage
.flatMapMany(this::getJsonParserMessage)
.flatMap(this::createJsonConsumerModel);
}
private Mono<JsonElement> getJsonParserMessage(String message) {
return StringUtils.isEmpty(message) ? logErrorAndReturnMonoEmpty("DmaaP response is empty")
: Mono.fromCallable(() -> new JsonParser().parse(message));
}
private Flux<ConsumerDmaapModel> createJsonConsumerModel(JsonElement jsonElement) {
return jsonElement.isJsonObject()
? create(Flux.defer(() -> Flux.just(jsonElement.getAsJsonObject())))
: getConsumerDmaapModelFromJsonArray(jsonElement);
}
private Flux<ConsumerDmaapModel> getConsumerDmaapModelFromJsonArray(JsonElement jsonElement) {
return create(
Flux.defer(() -> Flux.fromStream(StreamSupport.stream(jsonElement.getAsJsonArray().spliterator(), false)
.map(jsonElementFromArray -> getJsonObjectFromAnArray(jsonElementFromArray)
.orElseGet(JsonObject::new)))));
}
public 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 Flux<ConsumerDmaapModel> create(Flux<JsonObject> jsonObject) {
return jsonObject.flatMap(monoJsonP ->
!containsHeader(monoJsonP) ? logErrorAndReturnMonoEmpty("Incorrect JsonObject - missing header")
: transform(monoJsonP))
.onErrorResume(exception -> exception instanceof DmaapNotFoundException, e -> Mono.empty());
}
private Mono<ConsumerDmaapModel> transform(JsonObject responseFromDmaap) {
JsonObject commonEventHeader = responseFromDmaap.getAsJsonObject(EVENT)
.getAsJsonObject(COMMON_EVENT_HEADER);
JsonObject pnfRegistrationFields = responseFromDmaap.getAsJsonObject(EVENT)
.getAsJsonObject(PNF_REGISTRATION_FIELDS);
String pnfSourceName = getValueFromJson(commonEventHeader, SOURCE_NAME);
String pnfOamIpv4Address = getValueFromJson(pnfRegistrationFields, OAM_IPV_4_ADDRESS);
String pnfOamIpv6Address = getValueFromJson(pnfRegistrationFields, OAM_IPV_6_ADDRESS);
return (StringUtils.isEmpty(pnfSourceName) || !ipPropertiesNotEmpty(pnfOamIpv4Address, pnfOamIpv6Address))
? logErrorAndReturnMonoEmpty("Incorrect json, consumerDmaapModel can not be created: "
+ printMessage(pnfSourceName, pnfOamIpv4Address, pnfOamIpv6Address)) :
Mono.just(ImmutableConsumerDmaapModel.builder()
.correlationId(pnfSourceName)
.ipv4(pnfOamIpv4Address)
.ipv6(pnfOamIpv6Address).build());
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
private boolean ipPropertiesNotEmpty(String ipv4, String ipv6) {
return (!StringUtils.isEmpty(ipv4)) || !(StringUtils.isEmpty(ipv6));
}
private boolean containsHeader(JsonObject jsonObject) {
return jsonObject.has(EVENT) && jsonObject.getAsJsonObject(EVENT).has(PNF_REGISTRATION_FIELDS);
}
private String printMessage(String sourceName, String oamIpv4Address, String oamIpv6Address) {
return String.format("%n{"
+ "\"" + CORRELATION_ID + "\": \"%s\","
+ "\"" + OAM_IPV_4_ADDRESS + "\": \"%s\","
+ "\"" + OAM_IPV_6_ADDRESS + "\": \"%s\""
+ "%n}", sourceName, oamIpv4Address, oamIpv6Address);
}
private <T> Mono<T> logErrorAndReturnMonoEmpty(String messageForLogger) {
LOGGER.warn(messageForLogger);
return Mono.empty();
}
}
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