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// Copyright 2018 The gVisor Authors.
//
// 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 log
import (
"fmt"
"os"
"runtime"
"strings"
"time"
)
// GoogleEmitter is a wrapper that emits logs in a format compatible with
// package github.com/golang/glog.
type GoogleEmitter struct {
*Writer
}
// pid is used for the threadid component of the header.
var pid = os.Getpid()
// Emit emits the message, google-style.
//
// Log lines have this form:
// Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
//
// where the fields are defined as follows:
// L A single character, representing the log level (eg 'I' for INFO)
// mm The month (zero padded; ie May is '05')
// dd The day (zero padded)
// hh:mm:ss.uuuuuu Time in hours, minutes and fractional seconds
// threadid The space-padded thread ID as returned by GetTID()
// file The file name
// line The line number
// msg The user-supplied message
//
func (g GoogleEmitter) Emit(depth int, level Level, timestamp time.Time, format string, args ...interface{}) {
// Log level.
prefix := byte('?')
switch level {
case Debug:
prefix = byte('D')
case Info:
prefix = byte('I')
case Warning:
prefix = byte('W')
}
// Timestamp.
_, month, day := timestamp.Date()
hour, minute, second := timestamp.Clock()
microsecond := int(timestamp.Nanosecond() / 1000)
// 0 = this frame.
_, file, line, ok := runtime.Caller(depth + 1)
if ok {
// Trim any directory path from the file.
slash := strings.LastIndexByte(file, byte('/'))
if slash >= 0 {
file = file[slash+1:]
}
} else {
// We don't have a filename.
file = "???"
line = 0
}
// Generate the message.
message := fmt.Sprintf(format, args...)
// Emit the formatted result.
fmt.Fprintf(g.Writer, "%c%02d%02d %02d:%02d:%02d.%06d % 7d %s:%d] %s\n", prefix, int(month), day, hour, minute, second, microsecond, pid, file, line, message)
}
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