/
polling.go
51 lines (45 loc) · 1.06 KB
/
polling.go
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package tailer
import (
"os"
"time"
)
// pollForUpdates just sits here and tries to refill the buffer every interval
func (t *File) pollForUpdates(d time.Duration) {
for !t.closed {
if err := t.fill(); err != nil {
if err = t.reopenFile(); err != nil {
t.errc <- err
}
}
time.Sleep(d)
}
}
// pollForRotations hits the filesystem every interval looking to see if the file at `filename` path is different from what it was previously
func (t *File) pollForRotations(d time.Duration) {
previousFile, err := t.file.Stat()
if err != nil {
t.errc <- err
}
for !t.closed {
currentFile, err := os.Stat(t.filename)
switch err {
case nil:
switch os.SameFile(currentFile, previousFile) {
case true:
if t.checkForTruncate() {
if err := t.reopenFile(); err != nil {
t.errc <- err
}
}
case false:
previousFile = currentFile
if err := t.reopenFile(); err != nil {
t.errc <- err
}
}
default:
// Filename doens't seem to be there (or something else weird), wait for it to re-appear
}
time.Sleep(d)
}
}