// gatherWithTimeout gathers from the given input, with the given timeout.
// when the given timeout is reached, gatherWithTimeout logs an error message
// but continues waiting for it to return. This is to avoid leaving behind
// hung processes, and to prevent re-calling the same hung process over and
// over.
func gatherWithTimeout(
shutdown chan struct{},
input *models.RunningInput,
acc *accumulator,
timeout time.Duration,
) {
ticker := time.NewTicker(timeout)
defer ticker.Stop()
done := make(chan error)
go func() {
done <- input.Input.Gather(acc)
}()
for {
select {
case err := <-done:
if err != nil {
log.Printf("E! ERROR in input [%s]: %s", input.Name(), err)
}
return
case <-ticker.C:
log.Printf("E! ERROR: input [%s] took longer to collect than "+
"collection interval (%s)",
input.Name(), timeout)
continue
case <-shutdown:
return
}
}
}
func panicRecover(input *models.RunningInput) {
if err := recover(); err != nil {
trace := make([]byte, 2048)
runtime.Stack(trace, true)
log.Printf("E! FATAL: Input [%s] panicked: %s, Stack:\n%s\n",
input.Name(), err, trace)
log.Println("E! PLEASE REPORT THIS PANIC ON GITHUB with " +
"stack trace, configuration, and OS information: " +
"https://github.com/influxdata/telegraf/issues/new")
}
}
// gatherer runs the inputs that have been configured with their own
// reporting interval.
func (a *Agent) gatherer(
shutdown chan struct{},
input *models.RunningInput,
interval time.Duration,
metricC chan telegraf.Metric,
) {
defer panicRecover(input)
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
acc := NewAccumulator(input, metricC)
acc.SetPrecision(a.Config.Agent.Precision.Duration,
a.Config.Agent.Interval.Duration)
input.SetDebug(a.Config.Agent.Debug)
input.SetDefaultTags(a.Config.Tags)
internal.RandomSleep(a.Config.Agent.CollectionJitter.Duration, shutdown)
start := time.Now()
gatherWithTimeout(shutdown, input, acc, interval)
elapsed := time.Since(start)
log.Printf("D! Input [%s] gathered metrics, (%s interval) in %s\n",
input.Name(), interval, elapsed)
select {
case <-shutdown:
return
case <-ticker.C:
continue
}
}
}