88 lines
1.4 KiB
Go
88 lines
1.4 KiB
Go
package tracking
|
|
|
|
import (
|
|
"bufio"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
type LogTailer struct {
|
|
filePath string
|
|
handleLine func(string)
|
|
stopChan chan struct{}
|
|
isRunning bool
|
|
tracker *PositionTracker
|
|
}
|
|
|
|
func NewLogTailer(filePath string, handleLine func(string)) *LogTailer {
|
|
return &LogTailer{
|
|
filePath: filePath,
|
|
handleLine: handleLine,
|
|
stopChan: make(chan struct{}),
|
|
tracker: NewPositionTracker(filePath),
|
|
}
|
|
}
|
|
|
|
func (t *LogTailer) Start() {
|
|
if t.isRunning {
|
|
return
|
|
}
|
|
t.isRunning = true
|
|
|
|
go func() {
|
|
pos, err := t.tracker.LoadPosition()
|
|
if err != nil {
|
|
pos = &LogPosition{}
|
|
}
|
|
lastSize := pos.LastPosition
|
|
|
|
for {
|
|
select {
|
|
case <-t.stopChan:
|
|
t.isRunning = false
|
|
return
|
|
default:
|
|
if file, err := os.Open(t.filePath); err == nil {
|
|
stat, err := file.Stat()
|
|
if err != nil {
|
|
file.Close()
|
|
time.Sleep(time.Second)
|
|
continue
|
|
}
|
|
|
|
if stat.Size() < lastSize {
|
|
lastSize = 0
|
|
}
|
|
|
|
if lastSize > 0 {
|
|
file.Seek(lastSize, 0)
|
|
}
|
|
|
|
scanner := bufio.NewScanner(file)
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
t.handleLine(line)
|
|
lastSize, _ = file.Seek(0, 1)
|
|
|
|
t.tracker.SavePosition(&LogPosition{
|
|
LastPosition: lastSize,
|
|
LastRead: line,
|
|
})
|
|
}
|
|
|
|
file.Close()
|
|
}
|
|
|
|
time.Sleep(time.Second)
|
|
}
|
|
}
|
|
}()
|
|
}
|
|
|
|
func (t *LogTailer) Stop() {
|
|
if !t.isRunning {
|
|
return
|
|
}
|
|
close(t.stopChan)
|
|
}
|