| // Copyright 2020 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.util; |
| |
| import java.io.IOException; |
| import java.nio.file.Path; |
| import java.util.Optional; |
| import java.util.logging.Handler; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Utility to handle low-level interactions with debug ("info") logging. While actual logging is |
| * done with the {@code GoogleLogger} class, getting at internals is easier with the native {@link |
| * Logger} object. |
| */ |
| public class DebugLoggerConfigurator { |
| private static final Logger logger = Logger.getLogger(DebugLoggerConfigurator.class.getName()); |
| // Make sure we keep a strong reference to this logger, so that the |
| // configuration isn't lost when the gc kicks in. |
| private static final Logger templateLogger = Logger.getLogger("com.google.devtools.build"); |
| private static Level currentVerbosityLevel = null; |
| |
| private DebugLoggerConfigurator() {} |
| |
| /** |
| * Returns the path to the Blaze/Bazel server INFO log. |
| * |
| * @return the path to the log or empty if the log is not yet open |
| * @throws IOException if the log location cannot be determined |
| */ |
| public static Optional<String> getServerLogPath() throws IOException { |
| return LogHandlerQuerier.getConfiguredInstance() |
| .getLoggerFilePath(logger) |
| .map(Path::toAbsolutePath) |
| .map(Object::toString); |
| } |
| |
| /** Configures "com.google.devtools.build.*" loggers to the given {@code level}. */ |
| public static void setupLogging(Level level) { |
| if (!level.equals(currentVerbosityLevel)) { |
| templateLogger.setLevel(level); |
| templateLogger.info("Log level: " + templateLogger.getLevel()); |
| currentVerbosityLevel = level; |
| } |
| } |
| |
| /** Flushes all loggers at com.google.devtools.build.* or higher. */ |
| public static void flushServerLog() { |
| for (Logger logger = templateLogger; logger != null; logger = logger.getParent()) { |
| for (Handler handler : logger.getHandlers()) { |
| if (handler != null) { |
| handler.flush(); |
| } |
| } |
| } |
| } |
| } |