Commit | Line | Data |
---|---|---|
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 | ||
501f6777 | 18 | package org.lttng.ust.agent; |
43e5396b DG |
19 | |
20 | import java.util.concurrent.Semaphore; | |
21 | import java.nio.ByteBuffer; | |
22 | import java.nio.ByteOrder; | |
23 | import java.lang.Integer; | |
24 | import java.io.IOException; | |
25 | import java.io.BufferedOutputStream; | |
f1fa0535 | 26 | import java.io.BufferedReader; |
43e5396b DG |
27 | import java.io.ByteArrayOutputStream; |
28 | import java.io.DataOutputStream; | |
29 | import java.io.DataInputStream; | |
f1fa0535 DG |
30 | import java.io.FileReader; |
31 | import java.io.FileNotFoundException; | |
43e5396b DG |
32 | import java.net.*; |
33 | import java.lang.management.ManagementFactory; | |
43e5396b | 34 | |
501f6777 | 35 | class LTTngTCPSessiondClient implements Runnable { |
43e5396b | 36 | |
43e5396b | 37 | /* Command header from the session deamon. */ |
501f6777 CB |
38 | private LTTngSessiondCmd2_6.sessiond_hdr headerCmd = |
39 | new LTTngSessiondCmd2_6.sessiond_hdr(); | |
43e5396b | 40 | |
43e5396b | 41 | private Socket sessiondSock; |
501f6777 | 42 | private volatile boolean quit = false; |
43e5396b DG |
43 | |
44 | private DataInputStream inFromSessiond; | |
45 | private DataOutputStream outToSessiond; | |
46 | ||
501f6777 | 47 | private LogFramework log; |
43e5396b DG |
48 | |
49 | private Semaphore registerSem; | |
50 | ||
501f6777 | 51 | private static final String sessiondHost = "127.0.0.1"; |
2b8f5235 DG |
52 | private static final String rootPortFile = "/var/run/lttng/agent.port"; |
53 | private static final String userPortFile = "/.lttng/agent.port"; | |
501f6777 CB |
54 | |
55 | private static Integer protocolMajorVersion = 1; | |
56 | private static Integer protocolMinorVersion = 0; | |
57 | ||
58 | private LTTngAgent.Domain agentDomain; | |
f1fa0535 DG |
59 | |
60 | /* Indicate if we've already release the semaphore. */ | |
61 | private boolean sem_posted = false; | |
62 | ||
501f6777 CB |
63 | public LTTngTCPSessiondClient(LTTngAgent.Domain domain, LogFramework log, Semaphore sem) { |
64 | this.agentDomain = domain; | |
65 | this.log = log; | |
43e5396b | 66 | this.registerSem = sem; |
43e5396b DG |
67 | } |
68 | ||
f1fa0535 DG |
69 | /* |
70 | * Try to release the registerSem if it's not already done. | |
71 | */ | |
72 | private void tryReleaseSem() | |
73 | { | |
74 | /* Release semaphore so we unblock the agent. */ | |
75 | if (!this.sem_posted) { | |
76 | this.registerSem.release(); | |
77 | this.sem_posted = true; | |
78 | } | |
79 | } | |
80 | ||
501f6777 CB |
81 | @Override |
82 | public void run() { | |
43e5396b DG |
83 | for (;;) { |
84 | if (this.quit) { | |
85 | break; | |
86 | } | |
87 | ||
87d64abb | 88 | /* Cleanup Agent state before trying to connect or reconnect. */ |
501f6777 | 89 | this.log.reset(); |
87d64abb | 90 | |
43e5396b DG |
91 | try { |
92 | ||
93 | /* | |
94 | * Connect to the session daemon before anything else. | |
95 | */ | |
96 | connectToSessiond(); | |
97 | ||
98 | /* | |
99 | * Register to the session daemon as the Java component of the | |
100 | * UST application. | |
101 | */ | |
102 | registerToSessiond(); | |
43e5396b | 103 | |
43e5396b DG |
104 | /* |
105 | * Block on socket receive and wait for command from the | |
106 | * session daemon. This will return if and only if there is a | |
107 | * fatal error or the socket closes. | |
108 | */ | |
109 | handleSessiondCmd(); | |
110 | } catch (UnknownHostException uhe) { | |
f1fa0535 | 111 | tryReleaseSem(); |
43e5396b DG |
112 | System.out.println(uhe); |
113 | } catch (IOException ioe) { | |
f1fa0535 | 114 | tryReleaseSem(); |
501f6777 CB |
115 | try { |
116 | Thread.sleep(3000); | |
117 | } catch (InterruptedException e) { | |
118 | e.printStackTrace(); | |
119 | } | |
43e5396b | 120 | } catch (Exception e) { |
f1fa0535 | 121 | tryReleaseSem(); |
43e5396b DG |
122 | e.printStackTrace(); |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | public void destroy() { | |
128 | this.quit = true; | |
43e5396b DG |
129 | |
130 | try { | |
131 | if (this.sessiondSock != null) { | |
132 | this.sessiondSock.close(); | |
133 | } | |
134 | } catch (Exception e) { | |
135 | e.printStackTrace(); | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * Receive header data from the session daemon using the LTTng command | |
141 | * static buffer of the right size. | |
142 | */ | |
143 | private void recvHeader() throws Exception { | |
144 | int read_len; | |
145 | byte data[] = new byte[this.headerCmd.SIZE]; | |
146 | ||
147 | read_len = this.inFromSessiond.read(data, 0, data.length); | |
148 | if (read_len != data.length) { | |
149 | throw new IOException(); | |
150 | } | |
151 | this.headerCmd.populate(data); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Receive payload from the session daemon. This MUST be done after a | |
156 | * recvHeader() so the header value of a command are known. | |
157 | * | |
158 | * The caller SHOULD use isPayload() before which returns true if a payload | |
159 | * is expected after the header. | |
160 | */ | |
161 | private byte[] recvPayload() throws Exception { | |
162 | byte payload[] = new byte[(int) this.headerCmd.data_size]; | |
163 | ||
164 | /* Failsafe check so we don't waste our time reading 0 bytes. */ | |
165 | if (payload.length == 0) { | |
166 | return null; | |
167 | } | |
168 | ||
169 | this.inFromSessiond.read(payload, 0, payload.length); | |
170 | return payload; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Handle session command from the session daemon. | |
175 | */ | |
176 | private void handleSessiondCmd() throws Exception { | |
177 | int ret_code; | |
178 | byte data[] = null; | |
179 | ||
180 | while (true) { | |
181 | /* Get header from session daemon. */ | |
182 | recvHeader(); | |
183 | ||
184 | if (headerCmd.data_size > 0) { | |
185 | data = recvPayload(); | |
186 | } | |
187 | ||
188 | switch (headerCmd.cmd) { | |
f08bb871 DG |
189 | case CMD_REG_DONE: |
190 | { | |
191 | /* | |
192 | * Release semaphore so meaning registration is done and we | |
193 | * can proceed to continue tracing. | |
194 | */ | |
f1fa0535 | 195 | tryReleaseSem(); |
9aabed2d DG |
196 | /* |
197 | * We don't send any reply to the registration done command. | |
198 | * This just marks the end of the initial session setup. | |
199 | */ | |
200 | continue; | |
f08bb871 | 201 | } |
43e5396b DG |
202 | case CMD_LIST: |
203 | { | |
501f6777 CB |
204 | LTTngSessiondCmd2_6.sessiond_list_logger listLoggerCmd = |
205 | new LTTngSessiondCmd2_6.sessiond_list_logger(); | |
206 | listLoggerCmd.execute(this.log); | |
43e5396b DG |
207 | data = listLoggerCmd.getBytes(); |
208 | break; | |
209 | } | |
210 | case CMD_ENABLE: | |
211 | { | |
501f6777 CB |
212 | LTTngSessiondCmd2_6.sessiond_enable_handler enableCmd = |
213 | new LTTngSessiondCmd2_6.sessiond_enable_handler(); | |
43e5396b | 214 | if (data == null) { |
501f6777 | 215 | enableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD; |
43e5396b DG |
216 | break; |
217 | } | |
218 | enableCmd.populate(data); | |
501f6777 | 219 | enableCmd.execute(this.log); |
43e5396b DG |
220 | data = enableCmd.getBytes(); |
221 | break; | |
222 | } | |
223 | case CMD_DISABLE: | |
224 | { | |
501f6777 CB |
225 | LTTngSessiondCmd2_6.sessiond_disable_handler disableCmd = |
226 | new LTTngSessiondCmd2_6.sessiond_disable_handler(); | |
43e5396b | 227 | if (data == null) { |
501f6777 | 228 | disableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD; |
43e5396b DG |
229 | break; |
230 | } | |
231 | disableCmd.populate(data); | |
501f6777 | 232 | disableCmd.execute(this.log); |
43e5396b DG |
233 | data = disableCmd.getBytes(); |
234 | break; | |
235 | } | |
236 | default: | |
237 | { | |
238 | data = new byte[4]; | |
239 | ByteBuffer buf = ByteBuffer.wrap(data); | |
240 | buf.order(ByteOrder.BIG_ENDIAN); | |
501f6777 CB |
241 | LTTngSessiondCmd2_6.lttng_agent_ret_code code = |
242 | LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD; | |
43e5396b DG |
243 | break; |
244 | } | |
245 | } | |
246 | ||
247 | /* Send payload to session daemon. */ | |
248 | this.outToSessiond.write(data, 0, data.length); | |
249 | this.outToSessiond.flush(); | |
250 | } | |
251 | } | |
252 | ||
f1fa0535 DG |
253 | private String getHomePath() { |
254 | return System.getProperty("user.home"); | |
255 | } | |
256 | ||
257 | /** | |
258 | * Read port number from file created by the session daemon. | |
259 | * | |
260 | * @return port value if found else 0. | |
261 | */ | |
262 | private int getPortFromFile(String path) throws IOException { | |
263 | int port; | |
264 | BufferedReader br; | |
265 | ||
266 | try { | |
267 | br = new BufferedReader(new FileReader(path)); | |
268 | String line = br.readLine(); | |
269 | port = Integer.parseInt(line, 10); | |
270 | if (port < 0 || port > 65535) { | |
271 | /* Invalid value. Ignore. */ | |
272 | port = 0; | |
273 | } | |
274 | br.close(); | |
275 | } catch (FileNotFoundException e) { | |
276 | /* No port available. */ | |
277 | port = 0; | |
278 | } | |
279 | ||
280 | return port; | |
281 | } | |
282 | ||
43e5396b | 283 | private void connectToSessiond() throws Exception { |
f1fa0535 DG |
284 | int port; |
285 | ||
501f6777 | 286 | if (this.log.isRoot()) { |
f1fa0535 DG |
287 | port = getPortFromFile(rootPortFile); |
288 | if (port == 0) { | |
289 | /* No session daemon available. Stop and retry later. */ | |
290 | throw new IOException(); | |
291 | } | |
292 | } else { | |
293 | port = getPortFromFile(getHomePath() + userPortFile); | |
294 | if (port == 0) { | |
295 | /* No session daemon available. Stop and retry later. */ | |
296 | throw new IOException(); | |
297 | } | |
298 | } | |
299 | ||
300 | this.sessiondSock = new Socket(this.sessiondHost, port); | |
43e5396b DG |
301 | this.inFromSessiond = new DataInputStream( |
302 | sessiondSock.getInputStream()); | |
303 | this.outToSessiond = new DataOutputStream( | |
304 | sessiondSock.getOutputStream()); | |
305 | } | |
306 | ||
307 | private void registerToSessiond() throws Exception { | |
501f6777 | 308 | byte data[] = new byte[16]; |
43e5396b DG |
309 | ByteBuffer buf = ByteBuffer.wrap(data); |
310 | String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0]; | |
311 | ||
501f6777 | 312 | buf.putInt(this.agentDomain.value()); |
43e5396b | 313 | buf.putInt(Integer.parseInt(pid)); |
501f6777 CB |
314 | buf.putInt(this.protocolMajorVersion); |
315 | buf.putInt(this.protocolMinorVersion); | |
43e5396b DG |
316 | this.outToSessiond.write(data, 0, data.length); |
317 | this.outToSessiond.flush(); | |
318 | } | |
319 | } |