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photon-core/src/main/java/org/photonvision/common/logging/KernelLogLogger.java
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| /* | ||
| * Copyright (C) Photon Vision. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program 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 General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| package org.photonvision.common.logging; | ||
|
|
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| import edu.wpi.first.util.RuntimeDetector; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import org.photonvision.common.util.TimedTaskManager; | ||
| import org.photonvision.jni.QueuedFileLogger; | ||
|
|
||
| /** | ||
| * Listens for and reproduces Linux kernel logs, from /var/log/kern.log, into the Photon logger | ||
| * ecosystem | ||
| */ | ||
| public class KernelLogLogger { | ||
| private static KernelLogLogger INSTANCE; | ||
|
|
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| public static KernelLogLogger getInstance() { | ||
| if (INSTANCE == null) { | ||
| INSTANCE = new KernelLogLogger(); | ||
| } | ||
| return INSTANCE; | ||
| } | ||
|
|
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| QueuedFileLogger listener = null; | ||
| Logger logger = new Logger(KernelLogLogger.class, LogGroup.General); | ||
|
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| public KernelLogLogger() { | ||
| if (RuntimeDetector.isLinux()) { | ||
| logger.info("Listening for klogs on /var/log/dmesg ! Boot logs:"); | ||
|
|
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| try { | ||
| var bootlog = Files.readAllLines(Path.of("/var/log/dmesg")); | ||
| for (var line : bootlog) { | ||
| logger.log(line, LogLevel.DEBUG); | ||
| } | ||
| } catch (IOException e) { | ||
| logger.error("Couldn't read /var/log/dmesg - not printing boot logs"); | ||
| } | ||
|
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| listener = new QueuedFileLogger("/var/log/kern.log"); | ||
| } else { | ||
| System.out.println("NOT for klogs"); | ||
| } | ||
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| // arbitrary frequency to grab logs. The underlying native buffer will grow unbounded without | ||
| // this, lol | ||
| TimedTaskManager.getInstance().addTask("outputPrintk", this::outputNewPrintks, 1000); | ||
| } | ||
|
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| public void outputNewPrintks() { | ||
| for (var msg : listener.getNewlines()) { | ||
| // We currently set all logs to debug regardless of their actual level | ||
| logger.log(msg, LogLevel.DEBUG); | ||
| } | ||
| } | ||
| } |
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