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printer.go
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printer.go
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package logscollector
import (
"fmt"
"io"
"log"
"os"
"path/filepath"
"regexp"
"sort"
"strings"
"time"
"code.vegaprotocol.io/vegacapsule/types"
"code.vegaprotocol.io/vegacapsule/utils"
"github.com/nxadm/tail"
"golang.org/x/sync/errgroup"
)
type nomadLogFile struct {
path string
name string
taskName string
createdAt time.Time
}
var logsFileRegex = regexp.MustCompile("(.*[stderr|stdout])-(.*).log")
func TailLastLogs(logsDir string) error {
return Tail(logsDir, 4000, false, false)
}
func Tail(logsDir string, offset int64, follow, withLogger bool) error {
fileExists, err := utils.FileExists(logsDir)
if err != nil {
return err
}
if !fileExists {
return fmt.Errorf("logs directory %q does not exists", logsDir)
}
logFilePerTaskName, err := getLogsFilesPerTaskName(logsDir, withLogger)
if err != nil {
return fmt.Errorf("failed to get logs per task name: %w", err)
}
var eg errgroup.Group
for _, key := range logFilePerTaskName.SortedKeys() {
logFile := logFilePerTaskName[key]
if follow {
eg.Go(func() error {
return printLogFile(logFile, offset, follow)
})
} else {
if err := printLogFile(logFile, offset, follow); err != nil {
return err
}
}
}
return eg.Wait()
}
func printLogFile(logFile nomadLogFile, offset int64, follow bool) error {
fileInfo, err := os.Stat(logFile.path)
if err != nil {
return err
}
if fileInfo.Size() == 0 {
return nil
}
var seekInfo *tail.SeekInfo
if offset > fileInfo.Size() {
offset = fileInfo.Size()
}
if offset > 0 {
seekInfo = &tail.SeekInfo{
Offset: -offset,
Whence: io.SeekEnd,
}
}
t, err := tail.TailFile(logFile.path, tail.Config{
Follow: follow,
Poll: true,
Location: seekInfo,
})
if err != nil {
return fmt.Errorf("failed to tail file %q: %q", logFile.path, err)
}
if !follow {
fmt.Printf("-------- %s:\n", logFile.name)
}
for l := range t.Lines {
if l == nil {
continue
}
if l.Err != nil {
t.Cleanup()
return err
}
text := l.Text
if follow {
text = fmt.Sprintf("%s: %s", logFile.taskName, text)
}
if _, err := fmt.Fprintln(os.Stdout, text); err != nil {
return fmt.Errorf("failed to write to log file %q: %q", logFile.path, err)
}
}
fmt.Println()
t.Cleanup()
return nil
}
type logsFiles map[string]nomadLogFile
func (lf logsFiles) SortedKeys() []string {
keys := make([]string, 0, len(lf))
for k := range lf {
keys = append(keys, k)
}
sort.Strings(keys)
return keys
}
func getLogsFilesPerTaskName(logsDir string, withLogger bool) (logsFiles, error) {
match := fmt.Sprintf(`%s/*.[stderr|stdout]*.log`, logsDir)
logsPaths, err := filepath.Glob(match)
if err != nil {
return nil, fmt.Errorf("failed to look for files: %w", err)
}
logFilePerTaskName := logsFiles{}
for _, logPath := range logsPaths {
logFile := filepath.Base(logPath)
subMatch := logsFileRegex.FindStringSubmatch(logFile)
if len(subMatch) != 3 {
continue
}
taskName, createdAtStr := subMatch[1], subMatch[2]
createdAt, err := time.Parse(timeFormat, createdAtStr)
if err != nil {
log.Printf("failed to parse time from log file %q: %s", logFile, err)
continue
}
existingLogFile, ok := logFilePerTaskName[taskName]
if ok && existingLogFile.createdAt.After(createdAt) {
continue
}
if !withLogger && strings.Contains(taskName, types.NomadLogsCollectorTaskName) {
continue
}
logFilePerTaskName[taskName] = nomadLogFile{
taskName: taskName,
name: logFile,
path: logPath,
createdAt: createdAt,
}
}
return logFilePerTaskName, nil
}