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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 | ||
501f6777 | 18 | package org.lttng.ust.agent; |
43e5396b | 19 | |
f1fa0535 | 20 | import java.io.BufferedReader; |
43e5396b | 21 | import java.io.DataInputStream; |
bc7de6d9 | 22 | import java.io.DataOutputStream; |
f1fa0535 | 23 | import java.io.FileNotFoundException; |
bc7de6d9 AM |
24 | import java.io.FileReader; |
25 | import java.io.IOException; | |
43e5396b | 26 | import java.lang.management.ManagementFactory; |
bc7de6d9 AM |
27 | import java.net.Socket; |
28 | import java.net.UnknownHostException; | |
29 | import java.nio.ByteBuffer; | |
30 | import java.nio.ByteOrder; | |
31 | import java.util.concurrent.Semaphore; | |
43e5396b | 32 | |
501f6777 | 33 | class LTTngTCPSessiondClient implements Runnable { |
43e5396b | 34 | |
43e5396b | 35 | /* Command header from the session deamon. */ |
501f6777 CB |
36 | private LTTngSessiondCmd2_6.sessiond_hdr headerCmd = |
37 | new LTTngSessiondCmd2_6.sessiond_hdr(); | |
43e5396b | 38 | |
43e5396b | 39 | private Socket sessiondSock; |
501f6777 | 40 | private volatile boolean quit = false; |
43e5396b DG |
41 | |
42 | private DataInputStream inFromSessiond; | |
43 | private DataOutputStream outToSessiond; | |
44 | ||
501f6777 | 45 | private LogFramework log; |
43e5396b DG |
46 | |
47 | private Semaphore registerSem; | |
48 | ||
501f6777 | 49 | private static final String sessiondHost = "127.0.0.1"; |
2b8f5235 DG |
50 | private static final String rootPortFile = "/var/run/lttng/agent.port"; |
51 | private static final String userPortFile = "/.lttng/agent.port"; | |
501f6777 CB |
52 | |
53 | private static Integer protocolMajorVersion = 1; | |
54 | private static Integer protocolMinorVersion = 0; | |
55 | ||
56 | private LTTngAgent.Domain agentDomain; | |
f1fa0535 DG |
57 | |
58 | /* Indicate if we've already release the semaphore. */ | |
59 | private boolean sem_posted = false; | |
60 | ||
501f6777 CB |
61 | public LTTngTCPSessiondClient(LTTngAgent.Domain domain, LogFramework log, Semaphore sem) { |
62 | this.agentDomain = domain; | |
63 | this.log = log; | |
43e5396b | 64 | this.registerSem = sem; |
43e5396b DG |
65 | } |
66 | ||
f1fa0535 DG |
67 | /* |
68 | * Try to release the registerSem if it's not already done. | |
69 | */ | |
70 | private void tryReleaseSem() | |
71 | { | |
72 | /* Release semaphore so we unblock the agent. */ | |
73 | if (!this.sem_posted) { | |
74 | this.registerSem.release(); | |
75 | this.sem_posted = true; | |
76 | } | |
77 | } | |
78 | ||
501f6777 CB |
79 | @Override |
80 | public void run() { | |
43e5396b DG |
81 | for (;;) { |
82 | if (this.quit) { | |
83 | break; | |
84 | } | |
85 | ||
87d64abb | 86 | /* Cleanup Agent state before trying to connect or reconnect. */ |
501f6777 | 87 | this.log.reset(); |
87d64abb | 88 | |
43e5396b DG |
89 | try { |
90 | ||
91 | /* | |
92 | * Connect to the session daemon before anything else. | |
93 | */ | |
94 | connectToSessiond(); | |
95 | ||
96 | /* | |
97 | * Register to the session daemon as the Java component of the | |
98 | * UST application. | |
99 | */ | |
100 | registerToSessiond(); | |
43e5396b | 101 | |
43e5396b DG |
102 | /* |
103 | * Block on socket receive and wait for command from the | |
104 | * session daemon. This will return if and only if there is a | |
105 | * fatal error or the socket closes. | |
106 | */ | |
107 | handleSessiondCmd(); | |
108 | } catch (UnknownHostException uhe) { | |
f1fa0535 | 109 | tryReleaseSem(); |
43e5396b DG |
110 | System.out.println(uhe); |
111 | } catch (IOException ioe) { | |
f1fa0535 | 112 | tryReleaseSem(); |
501f6777 CB |
113 | try { |
114 | Thread.sleep(3000); | |
115 | } catch (InterruptedException e) { | |
116 | e.printStackTrace(); | |
117 | } | |
43e5396b | 118 | } catch (Exception e) { |
f1fa0535 | 119 | tryReleaseSem(); |
43e5396b DG |
120 | e.printStackTrace(); |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | public void destroy() { | |
126 | this.quit = true; | |
43e5396b DG |
127 | |
128 | try { | |
129 | if (this.sessiondSock != null) { | |
130 | this.sessiondSock.close(); | |
131 | } | |
132 | } catch (Exception e) { | |
133 | e.printStackTrace(); | |
134 | } | |
135 | } | |
136 | ||
137 | /* | |
138 | * Receive header data from the session daemon using the LTTng command | |
139 | * static buffer of the right size. | |
140 | */ | |
141 | private void recvHeader() throws Exception { | |
142 | int read_len; | |
bc7de6d9 | 143 | byte data[] = new byte[LTTngSessiondCmd2_6.sessiond_hdr.SIZE]; |
43e5396b DG |
144 | |
145 | read_len = this.inFromSessiond.read(data, 0, data.length); | |
146 | if (read_len != data.length) { | |
147 | throw new IOException(); | |
148 | } | |
149 | this.headerCmd.populate(data); | |
150 | } | |
151 | ||
152 | /* | |
153 | * Receive payload from the session daemon. This MUST be done after a | |
154 | * recvHeader() so the header value of a command are known. | |
155 | * | |
156 | * The caller SHOULD use isPayload() before which returns true if a payload | |
157 | * is expected after the header. | |
158 | */ | |
159 | private byte[] recvPayload() throws Exception { | |
160 | byte payload[] = new byte[(int) this.headerCmd.data_size]; | |
161 | ||
162 | /* Failsafe check so we don't waste our time reading 0 bytes. */ | |
163 | if (payload.length == 0) { | |
164 | return null; | |
165 | } | |
166 | ||
167 | this.inFromSessiond.read(payload, 0, payload.length); | |
168 | return payload; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Handle session command from the session daemon. | |
173 | */ | |
174 | private void handleSessiondCmd() throws Exception { | |
43e5396b DG |
175 | byte data[] = null; |
176 | ||
177 | while (true) { | |
178 | /* Get header from session daemon. */ | |
179 | recvHeader(); | |
180 | ||
181 | if (headerCmd.data_size > 0) { | |
182 | data = recvPayload(); | |
183 | } | |
184 | ||
185 | switch (headerCmd.cmd) { | |
f08bb871 DG |
186 | case CMD_REG_DONE: |
187 | { | |
188 | /* | |
189 | * Release semaphore so meaning registration is done and we | |
190 | * can proceed to continue tracing. | |
191 | */ | |
f1fa0535 | 192 | tryReleaseSem(); |
9aabed2d DG |
193 | /* |
194 | * We don't send any reply to the registration done command. | |
195 | * This just marks the end of the initial session setup. | |
196 | */ | |
197 | continue; | |
f08bb871 | 198 | } |
43e5396b DG |
199 | case CMD_LIST: |
200 | { | |
501f6777 CB |
201 | LTTngSessiondCmd2_6.sessiond_list_logger listLoggerCmd = |
202 | new LTTngSessiondCmd2_6.sessiond_list_logger(); | |
203 | listLoggerCmd.execute(this.log); | |
43e5396b DG |
204 | data = listLoggerCmd.getBytes(); |
205 | break; | |
206 | } | |
207 | case CMD_ENABLE: | |
208 | { | |
501f6777 CB |
209 | LTTngSessiondCmd2_6.sessiond_enable_handler enableCmd = |
210 | new LTTngSessiondCmd2_6.sessiond_enable_handler(); | |
43e5396b | 211 | if (data == null) { |
501f6777 | 212 | enableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD; |
43e5396b DG |
213 | break; |
214 | } | |
215 | enableCmd.populate(data); | |
501f6777 | 216 | enableCmd.execute(this.log); |
43e5396b DG |
217 | data = enableCmd.getBytes(); |
218 | break; | |
219 | } | |
220 | case CMD_DISABLE: | |
221 | { | |
501f6777 CB |
222 | LTTngSessiondCmd2_6.sessiond_disable_handler disableCmd = |
223 | new LTTngSessiondCmd2_6.sessiond_disable_handler(); | |
43e5396b | 224 | if (data == null) { |
501f6777 | 225 | disableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD; |
43e5396b DG |
226 | break; |
227 | } | |
228 | disableCmd.populate(data); | |
501f6777 | 229 | disableCmd.execute(this.log); |
43e5396b DG |
230 | data = disableCmd.getBytes(); |
231 | break; | |
232 | } | |
233 | default: | |
234 | { | |
235 | data = new byte[4]; | |
236 | ByteBuffer buf = ByteBuffer.wrap(data); | |
237 | buf.order(ByteOrder.BIG_ENDIAN); | |
43e5396b DG |
238 | break; |
239 | } | |
240 | } | |
241 | ||
242 | /* Send payload to session daemon. */ | |
243 | this.outToSessiond.write(data, 0, data.length); | |
244 | this.outToSessiond.flush(); | |
245 | } | |
246 | } | |
247 | ||
bc7de6d9 | 248 | private static String getHomePath() { |
f1fa0535 DG |
249 | return System.getProperty("user.home"); |
250 | } | |
251 | ||
252 | /** | |
253 | * Read port number from file created by the session daemon. | |
254 | * | |
255 | * @return port value if found else 0. | |
256 | */ | |
bc7de6d9 | 257 | private static int getPortFromFile(String path) throws IOException { |
f1fa0535 DG |
258 | int port; |
259 | BufferedReader br; | |
260 | ||
261 | try { | |
262 | br = new BufferedReader(new FileReader(path)); | |
263 | String line = br.readLine(); | |
264 | port = Integer.parseInt(line, 10); | |
265 | if (port < 0 || port > 65535) { | |
266 | /* Invalid value. Ignore. */ | |
267 | port = 0; | |
268 | } | |
269 | br.close(); | |
270 | } catch (FileNotFoundException e) { | |
271 | /* No port available. */ | |
272 | port = 0; | |
273 | } | |
274 | ||
275 | return port; | |
276 | } | |
277 | ||
43e5396b | 278 | private void connectToSessiond() throws Exception { |
f1fa0535 DG |
279 | int port; |
280 | ||
501f6777 | 281 | if (this.log.isRoot()) { |
f1fa0535 DG |
282 | port = getPortFromFile(rootPortFile); |
283 | if (port == 0) { | |
284 | /* No session daemon available. Stop and retry later. */ | |
285 | throw new IOException(); | |
286 | } | |
287 | } else { | |
288 | port = getPortFromFile(getHomePath() + userPortFile); | |
289 | if (port == 0) { | |
290 | /* No session daemon available. Stop and retry later. */ | |
291 | throw new IOException(); | |
292 | } | |
293 | } | |
294 | ||
bc7de6d9 | 295 | this.sessiondSock = new Socket(sessiondHost, port); |
43e5396b DG |
296 | this.inFromSessiond = new DataInputStream( |
297 | sessiondSock.getInputStream()); | |
298 | this.outToSessiond = new DataOutputStream( | |
299 | sessiondSock.getOutputStream()); | |
300 | } | |
301 | ||
302 | private void registerToSessiond() throws Exception { | |
501f6777 | 303 | byte data[] = new byte[16]; |
43e5396b DG |
304 | ByteBuffer buf = ByteBuffer.wrap(data); |
305 | String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0]; | |
306 | ||
501f6777 | 307 | buf.putInt(this.agentDomain.value()); |
43e5396b | 308 | buf.putInt(Integer.parseInt(pid)); |
bc7de6d9 AM |
309 | buf.putInt(protocolMajorVersion); |
310 | buf.putInt(protocolMinorVersion); | |
43e5396b DG |
311 | this.outToSessiond.write(data, 0, data.length); |
312 | this.outToSessiond.flush(); | |
313 | } | |
314 | } |