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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*-
* ============LICENSE_START=======================================================
* ONAP : DCAE
* ================================================================================
* Copyright 2019 TechMahindra
* ================================================================================
* 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.universalvesadapter.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.nio.file.Files;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.CbsRequests;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsRequest;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsClientConfiguration;
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.util.ResourceUtils;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
@Component
public class FetchDynamicConfig {
// @Value("${defaultProtocol}")
static String defaultProtocol = "http";
private static final Logger debugLogger = LoggerFactory.getLogger("debugLogger");
private static final Logger errorLogger = LoggerFactory.getLogger("errorLogger");
private static String url;
public static String retString;
public static String retCBSString;
// Generate RequestID and InvocationID which will be used when logging and in
// HTTP requests
final RequestDiagnosticContext diagnosticContext = RequestDiagnosticContext.create();
final CbsRequest request = CbsRequests.getConfiguration(diagnosticContext);
// Read necessary properties from the environment
static final CbsClientConfiguration env = CbsClientConfiguration.fromEnvironment();
public FetchDynamicConfig() {
}
public static void cbsCall(String configFile) {
Boolean areEqual;
// Call consul api and identify the CBS Service address and port
getconsul();
// Construct and invoke CBS API to get application Configuration
getCBS();
// Verify if data has changed
areEqual = verifyConfigChange(configFile);
if (!areEqual) {
FetchDynamicConfig fc = new FetchDynamicConfig();
if (retCBSString != null) {
fc.writefile(retCBSString, configFile);
} else {
debugLogger.debug("No content recieved from server");
}
} else {
debugLogger.info("New config pull results identical - {} NOT refreshed", configFile);
}
}
private static void getconsul() {
url = defaultProtocol + "://" + env.consulHost() + ":" + env.consulPort() + "/v1/catalog/service/"
+ env.cbsName();
retString = fetchResultFromDestination(url);
debugLogger.info("CBS details fetched from Consul");
}
public static boolean verifyConfigChange(String configFile) {
boolean areEqual = false;
// Read current data
try {
File f = new File(ClassLoader.getSystemResource(configFile.trim()).getFile());
if (f.exists() && !f.isDirectory()) {
debugLogger.info("Comparing local configuration with the configuration fethed from CBS ");
String jsonData = readFile(configFile);
JSONObject jsonObject = new JSONObject(jsonData);
ObjectMapper mapper = new ObjectMapper();
JsonNode tree1 = mapper.readTree(jsonObject.toString());
JsonNode tree2 = mapper.readTree(retCBSString);
areEqual = tree1.equals(tree2);
debugLogger.info("Comparison value:{}", areEqual);
} else {
debugLogger.info("First time config file read: {}",configFile);
}
} catch (IOException e) {
errorLogger.error("Comparison with new fetched data failed", e);
}
return areEqual;
}
public static void getCBS() {
// consul return as array
JSONTokener temp = new JSONTokener(retString);
JSONObject cbsjobj = (JSONObject) new JSONArray(temp).get(0);
String urlPart1 = null;
if (cbsjobj.has("ServiceAddress") && cbsjobj.has("ServicePort")) {
urlPart1 = cbsjobj.getString("ServiceAddress") + ":" + cbsjobj.getInt("ServicePort");
}
debugLogger.info("CONFIG_BINDING_SERVICE HOST:PORT is {}", urlPart1);
if (env.appName() != null) {
url = defaultProtocol + "://" + urlPart1 + "/service_component/" + env.appName();
retCBSString = fetchResultFromDestination(url);
debugLogger.info("Configuration fetched from CBS successfully..");
} else {
errorLogger.error("Service name environment variable - APP_NAME/SERVICE_NAME not found within container ");
}
}
public void writefile(String retCBSString, String configFile) {
String indentedretstring = (new JSONObject(retCBSString)).toString(4);
try {
debugLogger.info("Overwriting local configuration file {} with configuartions received from CBS",
configFile);
File file2 = ResourceUtils.getFile("classpath:" + configFile);
try (FileWriter fstream = new FileWriter(file2, false);
PrintWriter printWriter = new PrintWriter(fstream)) {
printWriter.print(indentedretstring);
}
debugLogger.info("New Config successfully written to local file to {}", configFile);
} catch (IOException e) {
errorLogger.error(
"Error in writing configuration into local KV file " + configFile + retString, e);
}
}
public static String readFile(String configFileName) {
String content = null;
File file = null;
try {
file = ResourceUtils.getFile("classpath:" + configFileName);
content = new String(Files.readAllBytes(file.toPath()));
} catch (FileNotFoundException e) {
errorLogger.error("colud not find file :{}", configFileName);
} catch (IOException e) {
errorLogger.error("unable to read the file , reason:", e);
} catch (Exception e) {
errorLogger.error("Exception occured , reason:", e);
}
return content;
}
private static String fetchResultFromDestination(String url) {
debugLogger.debug("FetchDynamicConfig : fetchResultFromDestination : START");
StringBuffer sb = new StringBuffer();
try {
HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);
BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
String line = "";
while ((line = rd.readLine()) != null) {
sb.append(line);
sb.append('\n');
}
} catch (ClientProtocolException e) {
debugLogger.debug("FetchDynamicConfig : fetchResultFromDestination : ClientProtocolException thrown.", e);
} catch (UnsupportedOperationException e) {
debugLogger.debug("FetchDynamicConfig : fetchResultFromDestination : UnsupportedOperationException thrown.",
e);
} catch (IOException e) {
debugLogger.debug("FetchDynamicConfig : fetchResultFromDestination : IOException thrown.", e);
}
debugLogger.debug("FetchDynamicConfig : fetchResultFromDestination : END");
return sb.toString();
}
}
|
