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
|
/*
* Copyright 2015 Open Networking Laboratory
*
* 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.
*/
package org.onlab.stc;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.eclipse.jetty.websocket.WebSocket;
import java.io.IOException;
import static org.onlab.stc.Coordinator.print;
/**
* Web socket capable of interacting with the STC monitor GUI.
*/
public class MonitorWebSocket implements WebSocket.OnTextMessage, WebSocket.OnControl {
private static final long MAX_AGE_MS = 30_000;
private static final byte PING = 0x9;
private static final byte PONG = 0xA;
private static final byte[] PING_DATA = new byte[]{(byte) 0xde, (byte) 0xad};
private final Monitor monitor;
private Connection connection;
private FrameConnection control;
private final ObjectMapper mapper = new ObjectMapper();
private long lastActive = System.currentTimeMillis();
/**
* Creates a new monitor client GUI web-socket.
*
* @param monitor shared process flow monitor
*/
MonitorWebSocket(Monitor monitor) {
this.monitor = monitor;
}
/**
* Issues a close on the connection.
*/
synchronized void close() {
destroyHandlers();
if (connection.isOpen()) {
connection.close();
}
}
/**
* Indicates if this connection is idle.
*
* @return true if idle or closed
*/
synchronized boolean isIdle() {
long quietFor = System.currentTimeMillis() - lastActive;
boolean idle = quietFor > MAX_AGE_MS;
if (idle || (connection != null && !connection.isOpen())) {
return true;
} else if (connection != null) {
try {
control.sendControl(PING, PING_DATA, 0, PING_DATA.length);
} catch (IOException e) {
print("Unable to send ping message due to: %s", e);
}
}
return false;
}
@Override
public void onOpen(Connection connection) {
this.connection = connection;
this.control = (FrameConnection) connection;
try {
createHandlers();
sendMessage(message("flow", monitor.scenarioData()));
} catch (Exception e) {
print("Unable to open monitor connection: %s", e);
this.connection.close();
this.connection = null;
this.control = null;
}
}
@Override
public synchronized void onClose(int closeCode, String message) {
destroyHandlers();
}
@Override
public boolean onControl(byte controlCode, byte[] data, int offset, int length) {
lastActive = System.currentTimeMillis();
return true;
}
@Override
public void onMessage(String data) {
lastActive = System.currentTimeMillis();
try {
ObjectNode message = (ObjectNode) mapper.reader().readTree(data);
// TODO:
print("Got message: %s", message);
} catch (Exception e) {
print("Unable to parse GUI message %s due to %s", data, e);
}
}
public synchronized void sendMessage(ObjectNode message) {
try {
if (connection.isOpen()) {
connection.sendMessage(message.toString());
}
} catch (IOException e) {
print("Unable to send message %s to GUI due to %s", message, e);
}
}
public ObjectNode message(String type, ObjectNode payload) {
ObjectNode message = mapper.createObjectNode().put("event", type);
message.set("payload", payload);
return message;
}
// Creates new message handlers.
private synchronized void createHandlers() {
}
// Destroys message handlers.
private synchronized void destroyHandlers() {
}
}
|
