2 * ============LICENSE_START======================================================================
3 * Copyright (C) 2018 NOKIA Intellectual Property, 2018 Nordix Foundation. All rights reserved.
4 * ===============================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
6 * in compliance with the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software distributed under the License
11 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
12 * or implied. See the License for the specific language governing permissions and limitations under
14 * ============LICENSE_END========================================================================
17 package org.onap.dcaegen2.collectors.datafile.service;
19 import com.google.gson.JsonArray;
20 import com.google.gson.JsonElement;
21 import com.google.gson.JsonObject;
22 import com.google.gson.JsonParser;
24 import java.util.ArrayList;
25 import java.util.List;
26 import java.util.Optional;
27 import java.util.stream.StreamSupport;
29 import org.onap.dcaegen2.collectors.datafile.exceptions.DmaapEmptyResponseException;
30 import org.onap.dcaegen2.collectors.datafile.exceptions.DmaapNotFoundException;
31 import org.slf4j.Logger;
32 import org.slf4j.LoggerFactory;
33 import org.onap.dcaegen2.collectors.datafile.model.FileData;
34 import org.onap.dcaegen2.collectors.datafile.model.ImmutableFileData;
35 import org.springframework.util.StringUtils;
37 import reactor.core.publisher.Mono;
40 * Parses the fileReady event and creates an array of FileData containing the information.
42 * @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 5/8/18
43 * @author <a href="mailto:henrik.b.andersson@est.tech">Henrik Andersson</a>
45 public class DmaapConsumerJsonParser {
47 private static final Logger logger = LoggerFactory.getLogger(DmaapConsumerJsonParser.class);
49 private static final String EVENT = "event";
50 private static final String NOTIFICATION_FIELDS = "notificationFields";
51 private static final String CHANGE_IDENTIFIER = "changeIdentifier";
52 private static final String CHANGE_TYPE = "changeType";
53 private static final String NOTIFICATION_FIELDS_VERSION = "notificationFieldsVersion";
55 private static final String ARRAY_OF_NAMED_HASH_MAP = "arrayOfNamedHashMap";
56 private static final String NAME = "name";
57 private static final String HASH_MAP = "hashMap";
58 private static final String LOCATION = "location";
59 private static final String COMPRESSION = "compression";
60 private static final String FILE_FORMAT_TYPE = "fileFormatType";
61 private static final String FILE_FORMAT_VERSION = "fileFormatVersion";
64 * Extract info from string and create @see {@link FileData}.
66 * @param rawMessage - results from DMaaP
67 * @return reactive Mono with an array of FileData
69 public Mono<List<FileData>> getJsonObject(Mono<String> rawMessage) {
70 return rawMessage.flatMap(this::getJsonParserMessage).flatMap(this::createJsonConsumerModel);
73 private Mono<JsonElement> getJsonParserMessage(String message) {
74 return StringUtils.isEmpty(message) ? Mono.error(new DmaapEmptyResponseException())
75 : Mono.fromSupplier(() -> new JsonParser().parse(message));
78 private Mono<List<FileData>> createJsonConsumerModel(JsonElement jsonElement) {
79 return jsonElement.isJsonObject() ? create(Mono.fromSupplier(jsonElement::getAsJsonObject))
80 : getFileDataFromJsonArray(jsonElement);
83 private Mono<List<FileData>> getFileDataFromJsonArray(JsonElement jsonElement) {
84 return create(Mono.fromCallable(() -> StreamSupport.stream(jsonElement.getAsJsonArray().spliterator(), false)
85 .findFirst().flatMap(this::getJsonObjectFromAnArray).orElseThrow(DmaapEmptyResponseException::new)));
88 public Optional<JsonObject> getJsonObjectFromAnArray(JsonElement element) {
89 return Optional.of(new JsonParser().parse(element.getAsString()).getAsJsonObject());
92 private Mono<List<FileData>> create(Mono<JsonObject> jsonObject) {
93 return jsonObject.flatMap(monoJsonP -> !containsHeader(monoJsonP)
94 ? Mono.error(new DmaapNotFoundException("Incorrect JsonObject - missing header"))
95 : transform(monoJsonP));
98 private Mono<List<FileData>> transform(JsonObject jsonObject) {
99 if (containsHeader(jsonObject, EVENT, NOTIFICATION_FIELDS)) {
100 JsonObject notificationFields = jsonObject.getAsJsonObject(EVENT).getAsJsonObject(NOTIFICATION_FIELDS);
101 String changeIdentifier = getValueFromJson(notificationFields, CHANGE_IDENTIFIER);
102 String changeType = getValueFromJson(notificationFields, CHANGE_TYPE);
103 String notificationFieldsVersion = getValueFromJson(notificationFields, NOTIFICATION_FIELDS_VERSION);
104 JsonArray arrayOfNamedHashMap = notificationFields.getAsJsonArray(ARRAY_OF_NAMED_HASH_MAP);
106 if (isNotificationFieldsHeaderNotEmpty(changeIdentifier, changeType, notificationFieldsVersion)
107 && arrayOfNamedHashMap != null) {
108 Mono<List<FileData>> res = getAllFileDataFromJson(changeIdentifier, changeType, arrayOfNamedHashMap);
112 if (!isNotificationFieldsHeaderNotEmpty(changeIdentifier, changeType, notificationFieldsVersion)) {
114 new DmaapNotFoundException("FileReady event header is missing information. " + jsonObject));
115 } else if (arrayOfNamedHashMap != null) {
117 new DmaapNotFoundException("FileReady event arrayOfNamedHashMap is missing. " + jsonObject));
120 new DmaapNotFoundException("FileReady event does not contain correct information. " + jsonObject));
123 new DmaapNotFoundException("FileReady event has incorrect JsonObject - missing header. " + jsonObject));
127 private Mono<List<FileData>> getAllFileDataFromJson(String changeIdentifier, String changeType,
128 JsonArray arrayOfAdditionalFields) {
129 List<FileData> res = new ArrayList<>();
130 for (int i = 0; i < arrayOfAdditionalFields.size(); i++) {
131 if (arrayOfAdditionalFields.get(i) != null) {
132 JsonObject fileInfo = (JsonObject) arrayOfAdditionalFields.get(i);
133 FileData fileData = getFileDataFromJson(fileInfo, changeIdentifier, changeType);
135 if (fileData != null) {
138 logger.error("Unable to collect file from xNF. File information wrong. " + fileInfo);
142 return Mono.just(res);
145 private FileData getFileDataFromJson(JsonObject fileInfo, String changeIdentifier, String changeType) {
146 FileData fileData = null;
148 String name = getValueFromJson(fileInfo, NAME);
149 JsonObject data = fileInfo.getAsJsonObject(HASH_MAP);
150 String fileFormatType = getValueFromJson(data, FILE_FORMAT_TYPE);
151 String fileFormatVersion = getValueFromJson(data, FILE_FORMAT_VERSION);
152 String location = getValueFromJson(data, LOCATION);
153 String compression = getValueFromJson(data, COMPRESSION);
155 if (isFileFormatFieldsNotEmpty(fileFormatVersion, fileFormatType)
156 && isNameAndLocationAndCompressionNotEmpty(name, location, compression)) {
157 fileData = ImmutableFileData.builder().changeIdentifier(changeIdentifier).changeType(changeType)
158 .location(location).compression(compression).fileFormatType(fileFormatType)
159 .fileFormatVersion(fileFormatVersion).build();
164 private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
165 return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
168 private boolean isNotificationFieldsHeaderNotEmpty(String changeIdentifier, String changeType,
169 String notificationFieldsVersion) {
170 return ((changeIdentifier != null && !changeIdentifier.isEmpty())
171 && (changeType != null && !changeType.isEmpty())
172 && (notificationFieldsVersion != null && !notificationFieldsVersion.isEmpty()));
175 private boolean isFileFormatFieldsNotEmpty(String fileFormatVersion, String fileFormatType) {
176 return ((fileFormatVersion != null && !fileFormatVersion.isEmpty())
177 && (fileFormatType != null && !fileFormatType.isEmpty()));
180 private boolean isNameAndLocationAndCompressionNotEmpty(String name, String location, String compression) {
181 return (name != null && !name.isEmpty()) && (location != null && !location.isEmpty())
182 && (compression != null && !compression.isEmpty());
185 private boolean containsHeader(JsonObject jsonObject) {
186 return jsonObject.has(EVENT) && jsonObject.getAsJsonObject(EVENT).has(NOTIFICATION_FIELDS);
189 private boolean containsHeader(JsonObject jsonObject, String topHeader, String header) {
190 return jsonObject.has(topHeader) && jsonObject.getAsJsonObject(topHeader).has(header);