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// Copyright 2017 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 com.google.common.collect.ImmutableRangeMap;
import com.google.common.collect.Range;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.time.Instant;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.LogRecord;
/**
* Formatter to write java.util.logging messages out in single-line format.
*
* <p>Log entries contain the date and time (in UTC), log level (as letter and numerical value),
* source location, thread ID, message and, if applicable, a stack trace.
*/
public class SingleLineFormatter extends Formatter {
/** Single-character codes based on {@link Level}s. */
private static final ImmutableRangeMap<Integer, Character> CODES_BY_LEVEL =
ImmutableRangeMap.<Integer, Character>builder()
.put(Range.atMost(Level.FINE.intValue()), 'D')
.put(Range.open(Level.FINE.intValue(), Level.WARNING.intValue()), 'I')
.put(Range.closedOpen(Level.WARNING.intValue(), Level.SEVERE.intValue()), 'W')
.put(Range.atLeast(Level.SEVERE.intValue()), 'X')
.build();
/** A thread safe, immutable formatter that can be used by all without contention. */
private static final DateTimeFormatter DATE_TIME_FORMAT =
DateTimeFormatter.ofPattern("yyMMdd HH:mm:ss.SSS").withZone(ZoneOffset.UTC);
@Override
public String format(LogRecord rec) {
StringBuilder buf = new StringBuilder();
// Timestamp
buf.append(
DATE_TIME_FORMAT.format(Instant.ofEpochMilli(rec.getMillis()).atZone(ZoneOffset.UTC)))
.append(':');
// One character code for level
buf.append(CODES_BY_LEVEL.get(rec.getLevel().intValue()));
// The stack trace, if any
Throwable thrown = rec.getThrown();
if (thrown != null) {
buf.append('T');
}
buf.append(' ');
// Information about the source of the exception
buf.append(rec.getThreadID())
.append(" [")
.append(rec.getSourceClassName())
.append('.')
.append(rec.getSourceMethodName())
.append("] ");
// The actual message
buf.append(formatMessage(rec)).append('\n');
if (thrown != null) {
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
thrown.printStackTrace(pw);
pw.flush();
buf.append(sw.toString());
}
return buf.toString();
}
}
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