78 lines
1.3 KiB
Go
78 lines
1.3 KiB
Go
package tracking
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import (
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"bufio"
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"os"
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"time"
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)
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type LogTailer struct {
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filePath string
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handleLine func(string)
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stopChan chan struct{}
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isRunning bool
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}
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func NewLogTailer(filePath string, handleLine func(string)) *LogTailer {
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return &LogTailer{
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filePath: filePath,
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handleLine: handleLine,
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stopChan: make(chan struct{}),
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}
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}
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func (t *LogTailer) Start() {
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if t.isRunning {
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return
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}
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t.isRunning = true
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go func() {
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var lastSize int64 = 0
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for {
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select {
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case <-t.stopChan:
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t.isRunning = false
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return
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default:
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// Try to open and read the file
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if file, err := os.Open(t.filePath); err == nil {
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stat, err := file.Stat()
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if err != nil {
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file.Close()
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time.Sleep(time.Second)
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continue
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}
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// If file was truncated, start from beginning
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if stat.Size() < lastSize {
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lastSize = 0
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}
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// Seek to last read position
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if lastSize > 0 {
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file.Seek(lastSize, 0)
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}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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t.handleLine(scanner.Text())
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lastSize, _ = file.Seek(0, 1) // Get current position
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}
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file.Close()
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}
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// Wait before next attempt
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time.Sleep(time.Second)
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}
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}
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}()
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}
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func (t *LogTailer) Stop() {
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if !t.isRunning {
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return
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}
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close(t.stopChan)
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} |