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monitoring.go
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monitoring.go
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package pipeline
import "github.com/elastic/beats/libbeat/monitoring"
type observer interface {
pipelineObserver
clientObserver
queueObserver
outputObserver
cleanup()
}
type pipelineObserver interface {
clientConnected()
clientClosing()
clientClosed()
}
type clientObserver interface {
newEvent()
filteredEvent()
publishedEvent()
failedPublishEvent()
}
type queueObserver interface {
queueACKed(n int)
}
type outputObserver interface {
updateOutputGroup()
eventsFailed(int)
eventsDropped(int)
eventsRetry(int)
outBatchSend(int)
outBatchACKed(int)
}
// metricsObserver is used by many component in the publisher pipeline, to report
// internal events. The oberserver can call registered global event handlers or
// updated shared counters/metrics for reporting.
// All events required for reporting events/metrics on the pipeline-global level
// are defined by observer. The components are only allowed to serve localized
// event-handlers only (e.g. the client centric events callbacks)
type metricsObserver struct {
metrics *monitoring.Registry
// clients metrics
clients *monitoring.Uint
// events publish/dropped stats
events, filtered, published, failed *monitoring.Uint
dropped, retry *monitoring.Uint // (retryer) drop/retry counters
activeEvents *monitoring.Uint
// queue metrics
ackedQueue *monitoring.Uint
}
func newMetricsObserver(metrics *monitoring.Registry) *metricsObserver {
reg := metrics.GetRegistry("pipeline")
if reg == nil {
reg = metrics.NewRegistry("pipeline")
}
return &metricsObserver{
metrics: metrics,
clients: monitoring.NewUint(reg, "clients"),
events: monitoring.NewUint(reg, "events.total"),
filtered: monitoring.NewUint(reg, "events.filtered"),
published: monitoring.NewUint(reg, "events.published"),
failed: monitoring.NewUint(reg, "events.failed"),
dropped: monitoring.NewUint(reg, "events.dropped"),
retry: monitoring.NewUint(reg, "events.retry"),
ackedQueue: monitoring.NewUint(reg, "queue.acked"),
activeEvents: monitoring.NewUint(reg, "events.active"),
}
}
func (o *metricsObserver) cleanup() {
if o.metrics != nil {
o.metrics.Remove("pipeline") // drop all metrics from registry
}
}
//
// client connects/disconnects
//
// (pipeline) pipeline did finish creating a new client instance
func (o *metricsObserver) clientConnected() { o.clients.Inc() }
// (client) close being called on client
func (o *metricsObserver) clientClosing() {}
// (client) client finished processing close
func (o *metricsObserver) clientClosed() { o.clients.Dec() }
//
// client publish events
//
// (client) client is trying to publish a new event
func (o *metricsObserver) newEvent() {
o.events.Inc()
o.activeEvents.Inc()
}
// (client) event is filtered out (on purpose or failed)
func (o *metricsObserver) filteredEvent() {
o.filtered.Inc()
o.activeEvents.Dec()
}
// (client) managed to push an event into the publisher pipeline
func (o *metricsObserver) publishedEvent() {
o.published.Inc()
}
// (client) client closing down or DropIfFull is set
func (o *metricsObserver) failedPublishEvent() {
o.failed.Inc()
o.activeEvents.Dec()
}
//
// queue events
//
// (queue) number of events ACKed by the queue/broker in use
func (o *metricsObserver) queueACKed(n int) {
o.ackedQueue.Add(uint64(n))
o.activeEvents.Sub(uint64(n))
}
//
// pipeline output events
//
// (controller) new output group is about to be loaded
func (o *metricsObserver) updateOutputGroup() {}
// (retryer) new failed batch has been received
func (o *metricsObserver) eventsFailed(int) {}
// (retryer) number of events dropped by retryer
func (o *metricsObserver) eventsDropped(n int) {
o.dropped.Add(uint64(n))
}
// (retryer) number of events pushed to the output worker queue
func (o *metricsObserver) eventsRetry(n int) {
o.retry.Add(uint64(n))
}
// (output) number of events to be forwarded to the output client
func (o *metricsObserver) outBatchSend(int) {}
// (output) number of events acked by the output batch
func (o *metricsObserver) outBatchACKed(int) {}
type emptyObserver struct{}
var nilObserver observer = (*emptyObserver)(nil)
func (*emptyObserver) cleanup() {}
func (*emptyObserver) clientConnected() {}
func (*emptyObserver) clientClosing() {}
func (*emptyObserver) clientClosed() {}
func (*emptyObserver) newEvent() {}
func (*emptyObserver) filteredEvent() {}
func (*emptyObserver) publishedEvent() {}
func (*emptyObserver) failedPublishEvent() {}
func (*emptyObserver) queueACKed(n int) {}
func (*emptyObserver) updateOutputGroup() {}
func (*emptyObserver) eventsFailed(int) {}
func (*emptyObserver) eventsDropped(int) {}
func (*emptyObserver) eventsRetry(int) {}
func (*emptyObserver) outBatchSend(int) {}
func (*emptyObserver) outBatchACKed(int) {}