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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 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;
import java.util.Optional;
import java.util.stream.StreamSupport;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.COMMON_EVENT_HEADER;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.COMMON_FORMAT_FOR_STRING;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.COMMON_FORMAT_FOR_JSON_OBJECT;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.CORRELATION_ID;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.EQUIP_MODEL;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.EQUIP_TYPE;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.EQUIP_VENDOR;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.EVENT;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.NF_ROLE;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.PNF_REGISTRATION_FIELDS;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.SERIAL_NUMBER;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.SOURCE_NAME;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.SW_VERSION;
import static org.onap.dcaegen2.services.prh.service.PnfRegistrationFields.ADDITIONAL_FIELDS;
/**
* @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 String pnfSourceName;
private String pnfSerialNumberOptionalField;
private String pnfEquipVendorOptionalField;
private String pnfEquipModelOptionalField;
private String pnfEquipTypeOptionalField;
private String pnfNfRoleOptionalField;
private String pnfSwVersionOptionalField;
private JsonObject pnfAdditionalFields;
/**
* 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);
this.pnfSourceName = getValueFromJson(commonEventHeader, SOURCE_NAME);
this.pnfNfRoleOptionalField = getValueFromJson(commonEventHeader, NF_ROLE);
this.pnfSerialNumberOptionalField = getValueFromJson(pnfRegistrationFields, SERIAL_NUMBER);
this.pnfEquipVendorOptionalField = getValueFromJson(pnfRegistrationFields, EQUIP_VENDOR);
this.pnfEquipModelOptionalField = getValueFromJson(pnfRegistrationFields, EQUIP_MODEL);
this.pnfEquipTypeOptionalField = getValueFromJson(pnfRegistrationFields, EQUIP_TYPE);
this.pnfSwVersionOptionalField = getValueFromJson(pnfRegistrationFields, SW_VERSION);
this.pnfAdditionalFields = pnfRegistrationFields.getAsJsonObject(ADDITIONAL_FIELDS);
return (StringUtils.isEmpty(pnfSourceName))
? logErrorAndReturnMonoEmpty("Incorrect json, consumerDmaapModel can not be created: "
+ printMessage()) :
Mono.just(ImmutableConsumerDmaapModel.builder()
.correlationId(pnfSourceName)
.serialNumber(pnfSerialNumberOptionalField)
.equipVendor(pnfEquipVendorOptionalField)
.equipModel(pnfEquipModelOptionalField)
.equipType(pnfEquipTypeOptionalField)
.nfRole(pnfNfRoleOptionalField)
.swVersion(pnfSwVersionOptionalField)
.additionalFields(Optional.ofNullable(pnfAdditionalFields).orElse(new JsonObject())).build());
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
private boolean containsHeader(JsonObject jsonObject) {
return jsonObject.has(EVENT) && jsonObject.getAsJsonObject(EVENT).has(PNF_REGISTRATION_FIELDS);
}
private String printMessage() {
return String.format("%n{"
+ "\"" + CORRELATION_ID + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + SERIAL_NUMBER + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + EQUIP_VENDOR + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + EQUIP_MODEL + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + EQUIP_TYPE + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + NF_ROLE + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + SW_VERSION + COMMON_FORMAT_FOR_STRING + ","
+ "\"" + ADDITIONAL_FIELDS + COMMON_FORMAT_FOR_JSON_OBJECT
+ "%n}", this.pnfSourceName,
this.pnfSerialNumberOptionalField, this.pnfEquipVendorOptionalField,
this.pnfEquipModelOptionalField, this.pnfEquipTypeOptionalField,
this.pnfNfRoleOptionalField, this.pnfSwVersionOptionalField, this.pnfAdditionalFields
);
}
private <T> Mono<T> logErrorAndReturnMonoEmpty(String messageForLogger) {
LOGGER.warn(messageForLogger);
return Mono.empty();
}
}
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