| 1 | /* |
| 2 | * Copyright (C) 2015, EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | package org.lttng.tools; |
| 20 | |
| 21 | import static org.lttng.tools.utils.ShellUtils.executeCommand; |
| 22 | |
| 23 | import java.util.Arrays; |
| 24 | import java.util.List; |
| 25 | import java.util.UUID; |
| 26 | import java.util.stream.Collectors; |
| 27 | |
| 28 | import org.lttng.tools.utils.ShellUtils; |
| 29 | |
| 30 | /** |
| 31 | * Implementation of {@link ILttngSession} which uses the command-line "lttng" |
| 32 | * tool to manipulate the session. Creating an instance will run "lttng create", |
| 33 | * close()'ing it will run "lttng destroy". |
| 34 | * |
| 35 | * @author Alexandre Montplaisir |
| 36 | */ |
| 37 | class LttngCommandLineSession implements ILttngSession { |
| 38 | |
| 39 | private final String sessionName; |
| 40 | private final Domain domain; |
| 41 | |
| 42 | private volatile boolean channelCreated = false; |
| 43 | |
| 44 | /** |
| 45 | * Constructor to create a new LTTng tracing session. |
| 46 | * |
| 47 | * @param sessionName |
| 48 | * The name of the session to use. It can be null, in which case |
| 49 | * we will provide a unique random name. |
| 50 | * @param domain |
| 51 | * The tracing domain of this session |
| 52 | */ |
| 53 | public LttngCommandLineSession(String sessionName, Domain domain) { |
| 54 | if (sessionName != null) { |
| 55 | this.sessionName = sessionName; |
| 56 | } else { |
| 57 | this.sessionName = UUID.randomUUID().toString(); |
| 58 | } |
| 59 | this.domain = domain; |
| 60 | |
| 61 | /* Create the session in LTTng */ |
| 62 | executeCommand(Arrays.asList("lttng", "create", this.sessionName)); |
| 63 | } |
| 64 | |
| 65 | @Override |
| 66 | public void close() { |
| 67 | /* Destroy the session */ |
| 68 | executeCommand(Arrays.asList("lttng", "destroy", sessionName)); |
| 69 | // FIXME also delete the trace we generated ? |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public boolean enableAllEvents() { |
| 74 | channelCreated = true; |
| 75 | return executeCommand(Arrays.asList( |
| 76 | "lttng", "enable-event", domain.flag(), "-a", "-s", sessionName)); |
| 77 | } |
| 78 | |
| 79 | @Override |
| 80 | public boolean enableEvents(String... enabledEvents) { |
| 81 | if (enabledEvents == null || enabledEvents.length == 0) { |
| 82 | throw new IllegalArgumentException(); |
| 83 | } |
| 84 | channelCreated = true; |
| 85 | return executeCommand(Arrays.asList( |
| 86 | "lttng", "enable-event", domain.flag(), |
| 87 | Arrays.stream(enabledEvents).collect(Collectors.joining(",")), |
| 88 | "-s", sessionName)); |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public boolean disableEvents(String... disabledEvents) { |
| 93 | if (disabledEvents == null || disabledEvents.length == 0) { |
| 94 | throw new IllegalArgumentException(); |
| 95 | } |
| 96 | return executeCommand(Arrays.asList( |
| 97 | "lttng", "disable-event", domain.flag(), |
| 98 | Arrays.stream(disabledEvents).collect(Collectors.joining(",")), |
| 99 | "-s", sessionName)); |
| 100 | } |
| 101 | |
| 102 | @Override |
| 103 | public boolean start() { |
| 104 | /* |
| 105 | * We have to enable a channel for 'lttng start' to work. However, we |
| 106 | * cannot enable a channel directly, see |
| 107 | * https://bugs.lttng.org/issues/894 . Instead we will enable an event |
| 108 | * we know does not exist |
| 109 | */ |
| 110 | if (!channelCreated) { |
| 111 | enableEvents("non-event"); |
| 112 | } |
| 113 | return executeCommand(Arrays.asList("lttng", "start", sessionName)); |
| 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public boolean stop() { |
| 118 | return executeCommand(Arrays.asList("lttng", "stop", sessionName)); |
| 119 | } |
| 120 | |
| 121 | @Override |
| 122 | public List<String> view() { |
| 123 | return ShellUtils.getOutputFromCommand(true, Arrays.asList("lttng", "view", sessionName)); |
| 124 | } |
| 125 | } |