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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.DmaapEmptyResponseException;
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.springframework.util.StringUtils;
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 String EVENT = "event";
private static final String OTHER_FIELDS = "otherFields";
private static final String PNF_OAM_IPV_4_ADDRESS = "pnfOamIpv4Address";
private static final String PNF_OAM_IPV_6_ADDRESS = "pnfOamIpv6Address";
private static final String PNF_VENDOR_NAME = "pnfVendorName";
private static final String PNF_SERIAL_NUMBER = "pnfSerialNumber";
public Mono<ConsumerDmaapModel> getJsonObject(Mono<String> monoMessage) {
return monoMessage
.flatMap(this::getJsonParserMessage)
.flatMap(this::createJsonConsumerModel);
}
private Mono<JsonElement> getJsonParserMessage(String message) {
return StringUtils.isEmpty(message) ? Mono.error(new DmaapEmptyResponseException())
: Mono.fromSupplier(() -> new JsonParser().parse(message));
}
private Mono<ConsumerDmaapModel> createJsonConsumerModel(JsonElement jsonElement) {
return jsonElement.isJsonObject()
? create(Mono.fromSupplier(jsonElement::getAsJsonObject))
: getConsumerDmaapModelFromJsonArray(jsonElement);
}
private Mono<ConsumerDmaapModel> getConsumerDmaapModelFromJsonArray(JsonElement jsonElement) {
return create(
Mono.fromCallable(() -> StreamSupport.stream(jsonElement.getAsJsonArray().spliterator(), false).findFirst()
.flatMap(this::getJsonObjectFromAnArray)
.orElseThrow(DmaapEmptyResponseException::new)));
}
public Optional<JsonObject> getJsonObjectFromAnArray(JsonElement element) {
return Optional.of(new JsonParser().parse(element.getAsString()).getAsJsonObject());
}
private Mono<ConsumerDmaapModel> create(Mono<JsonObject> jsonObject) {
return jsonObject.flatMap(monoJsonP ->
!containsHeader(monoJsonP) ? Mono.error(new DmaapNotFoundException("Incorrect JsonObject - missing header"))
: transform(monoJsonP));
}
private Mono<ConsumerDmaapModel> transform(JsonObject monoJsonP) {
monoJsonP = monoJsonP.getAsJsonObject(EVENT).getAsJsonObject(OTHER_FIELDS);
String pnfVendorName = getValueFromJson(monoJsonP, PNF_VENDOR_NAME);
String pnfSerialNumber = getValueFromJson(monoJsonP, PNF_SERIAL_NUMBER);
String pnfOamIpv4Address = getValueFromJson(monoJsonP, PNF_OAM_IPV_4_ADDRESS);
String pnfOamIpv6Address = getValueFromJson(monoJsonP, PNF_OAM_IPV_6_ADDRESS);
return
(!vendorAndSerialNotEmpty(pnfSerialNumber, pnfVendorName) || !ipPropertiesNotEmpty(pnfOamIpv4Address,
pnfOamIpv6Address))
? Mono.error(new DmaapNotFoundException("Incorrect json, consumerDmaapModel can not be created: "
+ printMessage(pnfVendorName, pnfSerialNumber, pnfOamIpv4Address, pnfOamIpv6Address))) :
Mono.just(ImmutableConsumerDmaapModel.builder()
.pnfName(pnfVendorName.substring(0, Math.min(pnfVendorName.length(), 3)).toUpperCase()
.concat(pnfSerialNumber)).ipv4(pnfOamIpv4Address)
.ipv6(pnfOamIpv6Address).build());
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
private boolean vendorAndSerialNotEmpty(String pnfSerialNumber, String pnfVendorName) {
return (!StringUtils.isEmpty(pnfSerialNumber) && !StringUtils.isEmpty(pnfVendorName));
}
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(OTHER_FIELDS);
}
private String printMessage(String pnfVendorName, String pnfSerialNumber, String pnfOamIpv4Address,
String pnfOamIpv6Address) {
return String.format("\n{"
+ "\"pnfVendorName\" : \"%s\","
+ "\"pnfSerialNumber\": \"%s\","
+ "\"pnfOamIpv4Address\": \"%s\","
+ "\"pnfOamIpv6Address\": \"%s\""
+ "\n}", pnfVendorName, pnfSerialNumber, pnfOamIpv4Address, pnfOamIpv6Address);
}
}
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