// Start method fetches and builds Sensu data from each datacenter every Refresh seconds
func (d *Daemon) Start(interval int, data chan *structs.Data) {
// immediately fetch the first set of data and send it over the data channel
d.fetchData()
d.buildData()
select {
case data <- d.Data:
logger.Trace("Sending initial results on the 'data' channel")
default:
logger.Trace("Could not send initial results on the 'data' channel")
}
// fetch new data every interval
duration := time.Duration(interval) * time.Second
for _ = range time.Tick(duration) {
d.resetData()
d.fetchData()
d.buildData()
// send the result over the data channel
select {
case data <- d.Data:
logger.Trace("Sending results on the 'data' channel")
default:
logger.Trace("Could not send results on the 'data' channel")
}
}
}
// listener listens on the data channel for messages from the daemon
// and updates the Data struct with latest results from the Sensu datacenters
func (u *Uchiwa) listener(interval int, data chan *structs.Data) {
for {
select {
case result := <-data:
logger.Trace("Received results on the 'data' channel")
u.Mu.Lock()
u.Data = result
u.Mu.Unlock()
// sleep during the interval
timer := time.NewTimer(time.Second * time.Duration(interval))
<-timer.C
default:
// sleep during 1 second
timer := time.NewTimer(time.Second * 1)
<-timer.C
}
}
}