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file.go
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file.go
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package logutil
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"time"
"go.uber.org/multierr"
"moul.io/u"
"berty.tech/berty/v2/go/pkg/errcode"
)
func newFileWriteCloser(target, kind string) (io.WriteCloser, error) {
var filename string
switch {
case strings.HasSuffix(target, ".log"): // use the indicated 'path' as filename
filename = target
default: // automatically create a new file in the 'path' directory following a pattern
startTime := time.Now().Format(filePatternDateLayout)
filename = filepath.Join(
target,
fmt.Sprintf("%s-%s.log", kind, startTime),
)
// run gc
{
err := LogfileGC(target, 20)
if err != nil {
return nil, err
}
}
}
if dir := filepath.Dir(filename); !u.DirExists(dir) {
err := os.MkdirAll(dir, 0o711)
if err != nil {
return nil, errcode.TODO.Wrap(err)
}
}
var writer io.WriteCloser
if u.FileExists(filename) {
var err error
writer, err = os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
if err != nil {
return nil, errcode.TODO.Wrap(err)
}
} else {
var err error
writer, err = os.Create(filename)
if err != nil {
return nil, errcode.TODO.Wrap(err)
}
}
return writer, nil
}
type Logfile struct {
Dir string
Name string
Size int64
Kind string
Time time.Time
Latest bool
Errs error `json:"Errs,omitempty"`
}
func (l Logfile) Path() string {
return filepath.Join(l.Dir, l.Name)
}
const filePatternDateLayout = "2006-01-02T15-04-05.000"
var filePatternRegex = regexp.MustCompile(`(?m)^(.*)-(\d{4}-\d{2}-\d{2}T\d{2}-\d{2}-\d{2}.\d{3}).log$`)
func LogfileList(logDir string) ([]*Logfile, error) {
files, err := ioutil.ReadDir(logDir)
if err != nil {
return nil, errcode.TODO.Wrap(err)
}
logfiles := []*Logfile{}
for _, file := range files {
sub := filePatternRegex.FindStringSubmatch(file.Name())
if sub == nil {
continue
}
t, err := time.Parse(filePatternDateLayout, sub[2])
var errs error
if err != nil {
errs = multierr.Append(errs, err)
}
logfiles = append(logfiles, &Logfile{
Dir: logDir,
Name: file.Name(),
Size: file.Size(),
Kind: sub[1],
Time: t,
Errs: errs,
})
}
// compute latest
if len(logfiles) > 0 {
var maxTime time.Time
for _, file := range logfiles {
if file.Time.After(maxTime) {
maxTime = file.Time
}
}
for _, file := range logfiles {
if file.Time == maxTime {
file.Latest = true
}
}
}
return logfiles, nil
}
func LogfileGC(logDir string, max int) error {
if !u.DirExists(logDir) {
return nil
}
files, err := LogfileList(logDir)
if err != nil {
return errcode.TODO.Wrap(err)
}
if len(files) < max {
return nil
}
sort.Slice(files, func(i, j int) bool {
return files[i].Time.Before(files[j].Time)
})
var errs error
for i := 0; i < len(files)-max; i++ {
err := os.Remove(files[i].Path())
if err != nil {
errs = multierr.Append(errs, err)
}
}
return errs
}