/
log.go
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/
log.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package log
import (
"io/ioutil"
"os"
"github.com/pkg/errors"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type removePIDfunc func(fname string, logger *Logger)
// Logger embeds a zap.Logger instance, and extends its Fatal
// and Panic methods to first remove the pid file.
type Logger struct {
*zap.Logger
PIDPath string
RemovePID removePIDfunc
}
// Fatal extends the zap Fatal to also remove the PID file.
func (log *Logger) Fatal(msg string, fields ...zapcore.Field) {
log.RemovePID(log.PIDPath, log)
log.Logger.Fatal(msg, fields...)
}
// Panic extends the zap Panic to also remove the PID file.
func (log *Logger) Panic(msg string, fields ...zapcore.Field) {
log.RemovePID(log.PIDPath, log)
log.Logger.Panic(msg, fields...)
}
// Config contains configuration for logging.
type Config struct {
Level string `yaml:"level"`
StdOut bool `yaml:"stdout"`
LogSink string `yaml:"logSink"`
}
// CreateLogger creates a zap logger.
func CreateLogger(c *zap.Config, pidPath string, removePIDfunc removePIDfunc) (*Logger, error) {
l, err := c.Build()
if err != nil {
return nil, errors.Wrap(err, "failed to create logger")
}
pl := Logger{
Logger: l,
PIDPath: pidPath,
RemovePID: removePIDfunc,
}
return &pl, nil
}
// ResetLogFiles keeps the last 'LogFileSizeKeepKB' KB of the log file if the size of the log file
// has exceeded 'LogFileSizeMaxMB' MB within the last 'PollOrchestratorIntervalSuccess' hours.
func ResetLogFiles(paths []string, fileSizeMaxMB int, fileSizeKeepKB int, logger *Logger) {
var fileSize int
for _, path := range paths {
switch path {
case "stdout":
fallthrough
case "stderr":
continue
}
file, err := os.Open(path)
if err != nil {
logger.Error("failed to open existing log file",
zap.String("file", path),
zap.Error(err))
continue
}
// Get the file size
stat, err := file.Stat()
if err != nil {
logger.Error("failed to read the FileInfo structure of the log file",
zap.String("file", path),
zap.Error(err))
goto close
}
fileSize = int(stat.Size())
if fileSize > fileSizeMaxMB*1024*1024 {
logger.Debug("Size of log file is larger than maximum allowed. Resetting.",
zap.String("file", path),
zap.Int("current_size_MB", fileSize),
zap.Int("maximum_allowed_size_MB", fileSizeMaxMB))
buf := make([]byte, fileSizeKeepKB*1024)
start := stat.Size() - int64(fileSizeKeepKB*1024)
if _, err = file.ReadAt(buf, start); err != nil {
logger.Error("failed to read existing log file",
zap.String("file", path),
zap.Error(err))
} else if err = ioutil.WriteFile(path, buf, 0644); err != nil {
logger.Error("failed to reset log file",
zap.String("file", path),
zap.Error(err))
}
}
// Avoid possible leaks because of using `defer`
close:
file.Close()
}
}