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package events
import (
"encoding/json"
"time"
"github.com/crc-org/crc/v2/pkg/crc/logging"
crcMachine "github.com/crc-org/crc/v2/pkg/crc/machine"
"github.com/r3labs/sse/v2"
)
type genData func() (interface{}, error)
// TickListener a data generator for an event stream. It will fetch data at regular intervals, and
// send it to all clients connected to the endpoint.
type TickListener struct {
done chan bool
generator genData
tickPeriod time.Duration
}
func newStatusStream(server *EventServer) EventStream {
return newStream(NewStatusListener(server.machine), newEventPublisher(STATUS, server.sseServer))
}
func NewStatusListener(machine crcMachine.Client) EventProducer {
getStatus := func() (interface{}, error) {
return machine.GetClusterLoad()
}
return NewTickListener(getStatus)
}
func NewTickListener(generator genData) EventProducer {
return &TickListener{
done: make(chan bool),
generator: generator,
tickPeriod: 2000 * time.Millisecond,
}
}
func (s *TickListener) Start(publisher EventPublisher) {
logging.Debug("Start sending status events")
ticker := time.NewTicker(s.tickPeriod)
go func() {
for {
select {
case <-s.done:
ticker.Stop()
logging.Debug("stop fetching machine info")
return
case <-ticker.C:
data, err := s.generator()
if err != nil {
logging.Errorf("unexpected error during getting machine status: %v", err)
continue
}
bytes, marshallError := json.Marshal(data)
if marshallError != nil {
logging.Errorf("unexpected error during status object to JSON conversion: %v", err)
continue
}
publisher.Publish(&sse.Event{Event: []byte("status"), Data: bytes})
}
}
}()
}
func (s *TickListener) Stop() {
logging.Debug("Stop sending status events")
s.done <- true
}
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