1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* ============LICENSE_START======================================================================
* Copyright (C) 2018 NOKIA Intellectual Property, 2018 Nordix Foundation. 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.collectors.datafile.service;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.StreamSupport;
import org.onap.dcaegen2.collectors.datafile.exceptions.DmaapEmptyResponseException;
import org.onap.dcaegen2.collectors.datafile.exceptions.DmaapNotFoundException;
import org.onap.dcaegen2.collectors.datafile.model.FileData;
import org.onap.dcaegen2.collectors.datafile.model.ImmutableFileData;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* Parses the fileReady event and creates an array of FileData containing the information.
*
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 5/8/18
* @author <a href="mailto:henrik.b.andersson@est.tech">Henrik Andersson</a>
*/
public class DmaapConsumerJsonParser {
private static final Logger logger = LoggerFactory.getLogger(DmaapConsumerJsonParser.class);
private static final String EVENT = "event";
private static final String NOTIFICATION_FIELDS = "notificationFields";
private static final String CHANGE_IDENTIFIER = "changeIdentifier";
private static final String CHANGE_TYPE = "changeType";
private static final String NOTIFICATION_FIELDS_VERSION = "notificationFieldsVersion";
private static final String ARRAY_OF_NAMED_HASH_MAP = "arrayOfNamedHashMap";
private static final String NAME = "name";
private static final String HASH_MAP = "hashMap";
private static final String LOCATION = "location";
private static final String COMPRESSION = "compression";
private static final String FILE_FORMAT_TYPE = "fileFormatType";
private static final String FILE_FORMAT_VERSION = "fileFormatVersion";
/**
* Extract info from string and create @see {@link FileData}.
*
* @param rawMessage - results from DMaaP
* @return reactive Mono with an array of FileData
*/
public Flux<FileData> getJsonObject(Mono<String> rawMessage) {
return rawMessage.flatMap(this::getJsonParserMessage).flatMapMany(this::createJsonConsumerModel);
}
private Mono<JsonElement> getJsonParserMessage(String message) {
logger.trace("original message from message router: {}", message);
return StringUtils.isEmpty(message) ? Mono.error(new DmaapEmptyResponseException())
: Mono.fromSupplier(() -> new JsonParser().parse(message));
}
private Flux<FileData> createJsonConsumerModel(JsonElement jsonElement) {
return jsonElement.isJsonObject() ? create(Mono.fromSupplier(jsonElement::getAsJsonObject))
: getFileDataFromJsonArray(jsonElement);
}
private Flux<FileData> getFileDataFromJsonArray(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) {
logger.trace("starting to getJsonObjectFromAnArray!");
return Optional.of(new JsonParser().parse(element.getAsString()).getAsJsonObject());
}
private Flux<FileData> create(Mono<JsonObject> jsonObject) {
return jsonObject.flatMapMany(monoJsonP -> !containsHeader(monoJsonP)
? Flux.error(new DmaapNotFoundException("Incorrect JsonObject - missing header"))
: transform(monoJsonP));
}
private Flux<FileData> transform(JsonObject jsonObject) {
if (containsHeader(jsonObject, EVENT, NOTIFICATION_FIELDS)) {
JsonObject notificationFields = jsonObject.getAsJsonObject(EVENT).getAsJsonObject(NOTIFICATION_FIELDS);
String changeIdentifier = getValueFromJson(notificationFields, CHANGE_IDENTIFIER);
String changeType = getValueFromJson(notificationFields, CHANGE_TYPE);
String notificationFieldsVersion = getValueFromJson(notificationFields, NOTIFICATION_FIELDS_VERSION);
JsonArray arrayOfNamedHashMap = notificationFields.getAsJsonArray(ARRAY_OF_NAMED_HASH_MAP);
if (isNotificationFieldsHeaderNotEmpty(changeIdentifier, changeType, notificationFieldsVersion)
&& arrayOfNamedHashMap != null) {
return getAllFileDataFromJson(changeIdentifier, changeType, arrayOfNamedHashMap);
}
if (!isNotificationFieldsHeaderNotEmpty(changeIdentifier, changeType, notificationFieldsVersion)) {
return Flux.error(
new DmaapNotFoundException("FileReady event header is missing information. " + jsonObject));
} else if (arrayOfNamedHashMap != null) {
return Flux.error(
new DmaapNotFoundException("FileReady event arrayOfNamedHashMap is missing. " + jsonObject));
}
return Flux.error(
new DmaapNotFoundException("FileReady event does not contain correct information. " + jsonObject));
}
return Flux.error(
new DmaapNotFoundException("FileReady event has incorrect JsonObject - missing header. " + jsonObject));
}
private Flux<FileData> getAllFileDataFromJson(String changeIdentifier, String changeType,
JsonArray arrayOfAdditionalFields) {
List<FileData> res = new ArrayList<>();
for (int i = 0; i < arrayOfAdditionalFields.size(); i++) {
if (arrayOfAdditionalFields.get(i) != null) {
JsonObject fileInfo = (JsonObject) arrayOfAdditionalFields.get(i);
FileData fileData = getFileDataFromJson(fileInfo, changeIdentifier, changeType);
if (fileData != null) {
res.add(fileData);
} else {
logger.error("Unable to collect file from xNF. File information wrong. Data: {}", fileInfo);
}
}
}
return Flux.fromIterable(res);
}
private FileData getFileDataFromJson(JsonObject fileInfo, String changeIdentifier, String changeType) {
logger.trace("starting to getFileDataFromJson!");
FileData fileData = null;
String name = getValueFromJson(fileInfo, NAME);
JsonObject data = fileInfo.getAsJsonObject(HASH_MAP);
String fileFormatType = getValueFromJson(data, FILE_FORMAT_TYPE);
String fileFormatVersion = getValueFromJson(data, FILE_FORMAT_VERSION);
String location = getValueFromJson(data, LOCATION);
String compression = getValueFromJson(data, COMPRESSION);
if (isFileFormatFieldsNotEmpty(fileFormatVersion, fileFormatType)
&& isNameAndLocationAndCompressionNotEmpty(name, location, compression)) {
fileData = ImmutableFileData.builder().name(name).changeIdentifier(changeIdentifier).changeType(changeType)
.location(location).compression(compression).fileFormatType(fileFormatType)
.fileFormatVersion(fileFormatVersion).build();
}
return fileData;
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
private boolean isNotificationFieldsHeaderNotEmpty(String changeIdentifier, String changeType,
String notificationFieldsVersion) {
return isStringIsNotNullAndNotEmpty(changeIdentifier) && isStringIsNotNullAndNotEmpty(changeType)
&& isStringIsNotNullAndNotEmpty(notificationFieldsVersion);
}
private boolean isFileFormatFieldsNotEmpty(String fileFormatVersion, String fileFormatType) {
return isStringIsNotNullAndNotEmpty(fileFormatVersion) && isStringIsNotNullAndNotEmpty(fileFormatType);
}
private boolean isNameAndLocationAndCompressionNotEmpty(String name, String location, String compression) {
return isStringIsNotNullAndNotEmpty(name) && isStringIsNotNullAndNotEmpty(location) &&
isStringIsNotNullAndNotEmpty(compression);
}
private boolean containsHeader(JsonObject jsonObject) {
return jsonObject.has(EVENT) && jsonObject.getAsJsonObject(EVENT).has(NOTIFICATION_FIELDS);
}
private boolean containsHeader(JsonObject jsonObject, String topHeader, String header) {
return jsonObject.has(topHeader) && jsonObject.getAsJsonObject(topHeader).has(header);
}
private boolean isStringIsNotNullAndNotEmpty(String string) {
return string != null && !string.isEmpty();
}
}
|
