+++ /dev/null
-/*
- * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License, version 2.1 only,
- * as published by the Free Software Foundation.
- *
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-package org.lttng.ust.agent;
-
-import java.io.BufferedReader;
-import java.io.DataInputStream;
-import java.io.DataOutputStream;
-import java.io.FileNotFoundException;
-import java.io.FileReader;
-import java.io.IOException;
-import java.lang.management.ManagementFactory;
-import java.net.Socket;
-import java.net.UnknownHostException;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.util.concurrent.Semaphore;
-
-class LTTngTCPSessiondClient implements Runnable {
-
- private static final String SESSION_HOST = "127.0.0.1";
- private static final String ROOT_PORT_FILE = "/var/run/lttng/agent.port";
- private static final String USER_PORT_FILE = "/.lttng/agent.port";
-
- private static Integer protocolMajorVersion = 1;
- private static Integer protocolMinorVersion = 0;
-
- /* Command header from the session deamon. */
- private LTTngSessiondCmd2_6.sessiond_hdr headerCmd =
- new LTTngSessiondCmd2_6.sessiond_hdr();
-
- private Socket sessiondSock;
- private volatile boolean quit = false;
-
- private DataInputStream inFromSessiond;
- private DataOutputStream outToSessiond;
-
- private LogFramework log;
-
- private Semaphore registerSem;
-
-
- private LTTngAgent.Domain agentDomain;
-
- /* Indicate if we've already released the semaphore. */
- private boolean semPosted = false;
-
- public LTTngTCPSessiondClient(LTTngAgent.Domain domain, LogFramework log, Semaphore sem) {
- this.agentDomain = domain;
- this.log = log;
- this.registerSem = sem;
- }
-
- /*
- * Try to release the registerSem if it's not already done.
- */
- private void tryReleaseSem() {
- /* Release semaphore so we unblock the agent. */
- if (!this.semPosted) {
- this.registerSem.release();
- this.semPosted = true;
- }
- }
-
- @Override
- public void run() {
- for (;;) {
- if (this.quit) {
- break;
- }
-
- /* Cleanup Agent state before trying to connect or reconnect. */
- this.log.reset();
-
- try {
-
- /*
- * Connect to the session daemon before anything else.
- */
- connectToSessiond();
-
- /*
- * Register to the session daemon as the Java component of the
- * UST application.
- */
- registerToSessiond();
-
- /*
- * Block on socket receive and wait for command from the
- * session daemon. This will return if and only if there is a
- * fatal error or the socket closes.
- */
- handleSessiondCmd();
- } catch (UnknownHostException uhe) {
- tryReleaseSem();
- System.out.println(uhe);
- } catch (IOException ioe) {
- tryReleaseSem();
- try {
- Thread.sleep(3000);
- } catch (InterruptedException e) {
- e.printStackTrace();
- }
- } catch (Exception e) {
- tryReleaseSem();
- e.printStackTrace();
- }
- }
- }
-
- public void destroy() {
- this.quit = true;
-
- try {
- if (this.sessiondSock != null) {
- this.sessiondSock.close();
- }
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
-
- /*
- * Receive header data from the session daemon using the LTTng command
- * static buffer of the right size.
- */
- private void recvHeader() throws Exception {
- byte data[] = new byte[LTTngSessiondCmd2_6.sessiond_hdr.SIZE];
-
- int readLen = this.inFromSessiond.read(data, 0, data.length);
- if (readLen != data.length) {
- throw new IOException();
- }
- this.headerCmd.populate(data);
- }
-
- /*
- * Receive payload from the session daemon. This MUST be done after a
- * recvHeader() so the header value of a command are known.
- *
- * The caller SHOULD use isPayload() before which returns true if a payload
- * is expected after the header.
- */
- private byte[] recvPayload() throws Exception {
- byte payload[] = new byte[(int) this.headerCmd.dataSize];
-
- /* Failsafe check so we don't waste our time reading 0 bytes. */
- if (payload.length == 0) {
- return null;
- }
-
- this.inFromSessiond.read(payload, 0, payload.length);
- return payload;
- }
-
- /*
- * Handle session command from the session daemon.
- */
- private void handleSessiondCmd() throws Exception {
- byte data[] = null;
-
- while (true) {
- /* Get header from session daemon. */
- recvHeader();
-
- if (headerCmd.dataSize > 0) {
- data = recvPayload();
- }
-
- switch (headerCmd.cmd) {
- case CMD_REG_DONE:
- {
- /*
- * Release semaphore so meaning registration is done and we
- * can proceed to continue tracing.
- */
- tryReleaseSem();
- /*
- * We don't send any reply to the registration done command.
- * This just marks the end of the initial session setup.
- */
- continue;
- }
- case CMD_LIST:
- {
- LTTngSessiondCmd2_6.sessiond_list_logger listLoggerCmd =
- new LTTngSessiondCmd2_6.sessiond_list_logger();
- listLoggerCmd.execute(this.log);
- data = listLoggerCmd.getBytes();
- break;
- }
- case CMD_ENABLE:
- {
- LTTngSessiondCmd2_6.sessiond_enable_handler enableCmd =
- new LTTngSessiondCmd2_6.sessiond_enable_handler();
- if (data == null) {
- enableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD;
- break;
- }
- enableCmd.populate(data);
- enableCmd.execute(this.log);
- data = enableCmd.getBytes();
- break;
- }
- case CMD_DISABLE:
- {
- LTTngSessiondCmd2_6.sessiond_disable_handler disableCmd =
- new LTTngSessiondCmd2_6.sessiond_disable_handler();
- if (data == null) {
- disableCmd.code = LTTngSessiondCmd2_6.lttng_agent_ret_code.CODE_INVALID_CMD;
- break;
- }
- disableCmd.populate(data);
- disableCmd.execute(this.log);
- data = disableCmd.getBytes();
- break;
- }
- default:
- {
- data = new byte[4];
- ByteBuffer buf = ByteBuffer.wrap(data);
- buf.order(ByteOrder.BIG_ENDIAN);
- break;
- }
- }
-
- /* Send payload to session daemon. */
- this.outToSessiond.write(data, 0, data.length);
- this.outToSessiond.flush();
- }
- }
-
- private static String getHomePath() {
- return System.getProperty("user.home");
- }
-
- /**
- * Read port number from file created by the session daemon.
- *
- * @return port value if found else 0.
- */
- private static int getPortFromFile(String path) throws IOException {
- int port;
- BufferedReader br;
-
- try {
- br = new BufferedReader(new FileReader(path));
- String line = br.readLine();
- port = Integer.parseInt(line, 10);
- if (port < 0 || port > 65535) {
- /* Invalid value. Ignore. */
- port = 0;
- }
- br.close();
- } catch (FileNotFoundException e) {
- /* No port available. */
- port = 0;
- }
-
- return port;
- }
-
- private void connectToSessiond() throws Exception {
- int port;
-
- if (this.log.isRoot()) {
- port = getPortFromFile(ROOT_PORT_FILE);
- if (port == 0) {
- /* No session daemon available. Stop and retry later. */
- throw new IOException();
- }
- } else {
- port = getPortFromFile(getHomePath() + USER_PORT_FILE);
- if (port == 0) {
- /* No session daemon available. Stop and retry later. */
- throw new IOException();
- }
- }
-
- this.sessiondSock = new Socket(SESSION_HOST, port);
- this.inFromSessiond = new DataInputStream(sessiondSock.getInputStream());
- this.outToSessiond = new DataOutputStream(sessiondSock.getOutputStream());
- }
-
- private void registerToSessiond() throws Exception {
- byte data[] = new byte[16];
- ByteBuffer buf = ByteBuffer.wrap(data);
- String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0];
-
- buf.putInt(this.agentDomain.value());
- buf.putInt(Integer.parseInt(pid));
- buf.putInt(protocolMajorVersion);
- buf.putInt(protocolMinorVersion);
- this.outToSessiond.write(data, 0, data.length);
- this.outToSessiond.flush();
- }
-}
projects / lttng-ust.git / blobdiff