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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
/*-
* ============LICENSE_START=======================================================
* feature-healthcheck
* ================================================================================
* Copyright (C) 2017 AT&T 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.policy.drools.healthcheck;
import java.util.ArrayList;
import java.util.Properties;
import javax.ws.rs.core.Response;
import org.onap.policy.drools.http.client.HttpClient;
import org.onap.policy.drools.http.server.HttpServletServer;
import org.onap.policy.drools.persistence.SystemPersistence;
import org.onap.policy.drools.properties.Startable;
import org.onap.policy.drools.system.PolicyEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Healthcheck
*/
public interface HealthCheck extends Startable {
/**
* Healthcheck Report
*/
public static class Report {
/**
* Named Entity in the report
*/
public String name;
/**
* URL queried
*/
public String url;
/**
* healthy?
*/
public boolean healthy;
/**
* return code
*/
public int code;
/**
* Message from remote entity
*/
public String message;
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Report [name=");
builder.append(name);
builder.append(", url=");
builder.append(url);
builder.append(", healthy=");
builder.append(healthy);
builder.append(", code=");
builder.append(code);
builder.append(", message=");
builder.append(message);
builder.append("]");
return builder.toString();
}
}
/**
* Report aggregation
*/
public static class Reports {
public boolean healthy;
public ArrayList<Report> details = new ArrayList<>();
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("Reports [healthy=");
builder.append(healthy);
builder.append(", details=");
builder.append(details);
builder.append("]");
return builder.toString();
}
}
/**
* perform a healthcheck
* @return a report
*/
public Reports healthCheck();
/**
* Healthcheck Monitor
*/
public static final HealthCheck monitor = new HealthCheckMonitor();
}
/**
* Healthcheck Monitor
*/
class HealthCheckMonitor implements HealthCheck {
/**
* Logger
*/
private static Logger logger = LoggerFactory.getLogger(HealthCheckMonitor.class);
/**
* attached http servers
*/
protected volatile ArrayList<HttpServletServer> servers = new ArrayList<>();
/**
* attached http clients
*/
protected volatile ArrayList<HttpClient> clients = new ArrayList<>();
/**
* healthcheck configuration
*/
protected volatile Properties healthCheckProperties = null;
/**
* {@inheritDoc}
*/
@Override
public Reports healthCheck() {
Reports reports = new Reports();
reports.healthy = PolicyEngine.manager.isAlive();
HealthCheck.Report engineReport = new Report();
engineReport.healthy = PolicyEngine.manager.isAlive();
engineReport.name = "PDP-D";
engineReport.url = "self";
engineReport.code = PolicyEngine.manager.isAlive() ? 200 : 500;
engineReport.message = PolicyEngine.manager.isAlive() ? "alive" : "not alive";
reports.details.add(engineReport);
for (HttpClient client : clients) {
HealthCheck.Report report = new Report();
report.name = client.getName();
report.url = client.getBaseUrl();
report.healthy = true;
try {
Response response = client.get();
report.code = response.getStatus();
if (report.code != 200) {
report.healthy = false;
reports.healthy = false;
}
try {
report.message = HttpClient.getBody(response, String.class);
} catch (Exception e) {
logger.info("{}: cannot get body from http-client {}", this, client, e);
}
} catch (Exception e) {
logger.warn("{}: cannot contact http-client {}", this, client, e);
report.healthy = false;
reports.healthy = false;
}
reports.details.add(report);
}
return reports;
}
/**
* {@inheritDoc}
*/
@Override
public boolean start() throws IllegalStateException {
try {
this.healthCheckProperties = SystemPersistence.manager.getProperties(HealthCheckFeature.CONFIGURATION_PROPERTIES_NAME);
this.servers = HttpServletServer.factory.build(healthCheckProperties);
this.clients = HttpClient.factory.build(healthCheckProperties);
for (HttpServletServer server : servers) {
try {
server.start();
} catch (Exception e) {
logger.warn("{}: cannot start http-server {}", this, server, e);
}
}
} catch (Exception e) {
logger.warn("{}: cannot start {}", this, e);
return false;
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public boolean stop() throws IllegalStateException {
for (HttpServletServer server : servers) {
try {
server.stop();
} catch (Exception e) {
logger.warn("{}: cannot stop http-server {}", this, server, e);
}
}
for (HttpClient client : clients) {
try {
client.stop();
} catch (Exception e) {
logger.warn("{}: cannot stop http-client {}", this, client, e);
}
}
return true;
}
/**
* {@inheritDoc}
*/
@Override
public void shutdown() throws IllegalStateException {
this.stop();
}
/**
* {@inheritDoc}
*/
@Override
public synchronized boolean isAlive() {
return this.healthCheckProperties != null;
}
/**
* @return list of attached Http Servers
*/
public ArrayList<HttpServletServer> getServers() {
return this.servers;
}
/**
* @return list of attached Http Clients
*/
public ArrayList<HttpClient> getClients() {
return this.clients;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("HealthCheckMonitor [servers=");
builder.append(servers);
builder.append(", clients=");
builder.append(clients);
builder.append("]");
return builder.toString();
}
}
|