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43e5396b DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | package org.lttng.ust.jul; | |
19 | ||
20 | import java.io.IOException; | |
43e5396b DG |
21 | import java.io.InputStream; |
22 | import java.io.BufferedReader; | |
23 | import java.io.FileReader; | |
24 | import java.util.concurrent.Semaphore; | |
f1fa0535 | 25 | import java.util.concurrent.TimeUnit; |
43e5396b DG |
26 | import java.util.logging.FileHandler; |
27 | import java.util.logging.Handler; | |
28 | import java.util.logging.Level; | |
29 | import java.util.logging.Logger; | |
30 | import java.util.logging.LogManager; | |
31 | import java.util.Enumeration; | |
32 | ||
33 | public class LTTngAgent { | |
43e5396b | 34 | private static LogManager logManager; |
9aabed2d DG |
35 | |
36 | /* Possible that we have to threads handling two sessiond. */ | |
37 | private static LTTngLogHandler lttngHandlerRoot; | |
38 | private static LTTngLogHandler lttngHandlerUser; | |
39 | private static LTTngThread lttngThreadRoot; | |
40 | private static LTTngThread lttngThreadUser; | |
41 | private static Thread sessiondThRoot; | |
42 | private static Thread sessiondThUser; | |
43e5396b DG |
43 | |
44 | /* Singleton agent object. */ | |
45 | private static LTTngAgent curAgent = null; | |
46 | ||
47 | /* Indicate if this object has been initialized. */ | |
48 | private static boolean initialized = false; | |
49 | ||
50 | private static Semaphore registerSem; | |
f1fa0535 | 51 | private final static int semTimeout = 3; /* Seconds */ |
43e5396b | 52 | |
f1fa0535 DG |
53 | /* |
54 | * Default value to connect to session daemon. Port number is dynamically | |
55 | * fetched from the port file that is created by a running session daemon. | |
56 | */ | |
43e5396b | 57 | private static final String sessiondAddr = "127.0.0.1"; |
43e5396b DG |
58 | |
59 | /* | |
60 | * Constructor is private. This is a singleton and a reference should be | |
61 | * acquired using getLTTngAgent(). | |
62 | */ | |
63 | private LTTngAgent() throws IOException { | |
64 | this.logManager = LogManager.getLogManager(); | |
9aabed2d DG |
65 | this.lttngHandlerUser = new LTTngLogHandler(this.logManager); |
66 | this.lttngHandlerRoot = new LTTngLogHandler(this.logManager); | |
67 | this.lttngHandlerRoot.is_root = 1; | |
43e5396b DG |
68 | this.registerSem = new Semaphore(0, true); |
69 | } | |
70 | ||
71 | private void removeHandlers() throws SecurityException, IOException { | |
72 | String loggerName; | |
73 | Logger logger; | |
74 | ||
75 | Enumeration list = this.logManager.getLoggerNames(); | |
76 | while (list.hasMoreElements()) { | |
77 | loggerName = list.nextElement().toString(); | |
78 | /* Somehow there is always an empty string at the end. */ | |
79 | if (loggerName == "") { | |
80 | continue; | |
81 | } | |
82 | ||
83 | logger = this.logManager.getLogger(loggerName); | |
9aabed2d DG |
84 | logger.removeHandler(this.lttngHandlerUser); |
85 | logger.removeHandler(this.lttngHandlerRoot); | |
43e5396b DG |
86 | } |
87 | } | |
88 | ||
89 | private int getUID() throws IOException { | |
90 | int uid; | |
91 | byte b[] = new byte[4]; | |
92 | String userName = System.getProperty("user.name"); | |
93 | String command = "id -u " + userName; | |
94 | Process child = Runtime.getRuntime().exec(command); | |
95 | InputStream in = child.getInputStream(); | |
96 | ||
97 | in.read(b); | |
98 | uid = Integer.parseInt(new String(b).trim(), 10); | |
99 | in.close(); | |
100 | ||
101 | return uid; | |
102 | } | |
103 | ||
43e5396b DG |
104 | /* |
105 | * Public getter to acquire a reference to this singleton object. | |
106 | */ | |
107 | public static synchronized LTTngAgent getLTTngAgent() throws IOException { | |
108 | if (curAgent == null) { | |
109 | curAgent = new LTTngAgent(); | |
110 | curAgent.init(); | |
111 | } | |
112 | ||
113 | return curAgent; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Initialize LTTngAgent. This will attach the log handler to all Logger | |
118 | * returned by the logManager. | |
119 | */ | |
120 | private synchronized void init() throws SecurityException, IOException { | |
9aabed2d DG |
121 | int nr_acquires = 0; |
122 | ||
43e5396b DG |
123 | if (this.initialized) { |
124 | return; | |
125 | } | |
126 | ||
9aabed2d | 127 | /* Handle user session daemon if any. */ |
f1fa0535 | 128 | this.lttngThreadUser = new LTTngThread(this.sessiondAddr, |
9aabed2d DG |
129 | this.lttngHandlerUser, this.registerSem); |
130 | this.sessiondThUser = new Thread(lttngThreadUser); | |
0c52a51d | 131 | this.sessiondThUser.setDaemon(true); |
9aabed2d DG |
132 | this.sessiondThUser.start(); |
133 | /* Wait for registration done of per-user sessiond */ | |
134 | nr_acquires++; | |
135 | ||
f1fa0535 DG |
136 | /* Handle root session daemon. */ |
137 | this.lttngThreadRoot = new LTTngThread(this.sessiondAddr, | |
138 | this.lttngHandlerRoot, this.registerSem); | |
139 | this.sessiondThRoot = new Thread(lttngThreadRoot); | |
0c52a51d | 140 | this.sessiondThRoot.setDaemon(true); |
f1fa0535 DG |
141 | this.sessiondThRoot.start(); |
142 | /* Wait for registration done of system-wide sessiond */ | |
143 | nr_acquires++; | |
43e5396b | 144 | |
9aabed2d | 145 | /* Wait for each registration to end. */ |
43e5396b | 146 | try { |
f1fa0535 DG |
147 | this.registerSem.tryAcquire(nr_acquires, semTimeout, |
148 | TimeUnit.SECONDS); | |
43e5396b DG |
149 | } catch (InterruptedException e) { |
150 | e.printStackTrace(); | |
151 | } | |
9aabed2d DG |
152 | |
153 | this.initialized = true; | |
43e5396b DG |
154 | } |
155 | ||
156 | public void dispose() throws IOException { | |
9aabed2d DG |
157 | this.lttngThreadUser.dispose(); |
158 | if (this.lttngThreadRoot != null) { | |
159 | this.lttngThreadRoot.dispose(); | |
160 | } | |
43e5396b DG |
161 | |
162 | /* Make sure there is no more LTTng handler attach to logger(s). */ | |
163 | this.removeHandlers(); | |
164 | ||
165 | try { | |
9aabed2d DG |
166 | this.sessiondThUser.join(); |
167 | if (this.sessiondThRoot != null) { | |
168 | this.sessiondThRoot.join(); | |
169 | } | |
43e5396b DG |
170 | } catch (InterruptedException e) { |
171 | e.printStackTrace(); | |
172 | } | |
173 | } | |
174 | } |