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Copy pathtail.go
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tail.go
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package logtail
import (
"bufio"
"fmt"
"io"
"os"
"path"
)
func batchCheckWatchChan(filename string, ch <-chan WatchEvent) (isCreate bool) {
isCreate = false
count := 1
first := <-ch
if first.Filename == filename && first.Type == EventTypeCreate {
isCreate = true
}
for {
select {
case event := <-ch:
count++
if event.Filename == filename && event.Type == EventTypeCreate {
isCreate = true
}
default:
fmt.Println(count)
return
}
}
}
// TailFile ...
func TailFile(dirname string, filename string, ch <-chan WatchEvent, fn func(line string)) {
filepath := path.Join(dirname, filename)
file, err := os.Open(filepath)
if err != nil {
panic(err)
}
reader := bufio.NewReader(file)
ReadLoop:
for {
line, err := reader.ReadString('\n')
if err == io.EOF {
isCreate := batchCheckWatchChan(filename, ch)
if isCreate {
_ = file.Close()
newFile, err := os.Open(filepath)
if err != nil {
panic(err)
}
file = newFile
reader = bufio.NewReader(file)
continue ReadLoop
}
currentPos, err := file.Seek(0, os.SEEK_CUR)
if err != nil {
panic(err)
}
stat, err := file.Stat()
if err != nil {
panic(err)
}
if currentPos > stat.Size() {
_, err := file.Seek(0, os.SEEK_SET)
if err != nil {
panic(err)
}
}
continue ReadLoop
}
if err != nil {
panic(err)
}
fn(line)
}
}