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basic_metrics.go
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basic_metrics.go
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package eventbus
import (
"reflect"
"strings"
"github.com/libp2p/go-libp2p/p2p/metricshelper"
"github.com/prometheus/client_golang/prometheus"
)
const metricNamespace = "libp2p_eventbus"
var (
eventsEmitted = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: metricNamespace,
Name: "events_emitted_total",
Help: "Events Emitted",
},
[]string{"event"},
)
totalSubscribers = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: metricNamespace,
Name: "subscribers_total",
Help: "Number of subscribers for an event type",
},
[]string{"event"},
)
subscriberQueueLength = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: metricNamespace,
Name: "subscriber_queue_length",
Help: "Subscriber queue length",
},
[]string{"subscriber_name"},
)
subscriberQueueFull = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Namespace: metricNamespace,
Name: "subscriber_queue_full",
Help: "Subscriber Queue completely full",
},
[]string{"subscriber_name"},
)
subscriberEventQueued = prometheus.NewCounterVec(
prometheus.CounterOpts{
Namespace: metricNamespace,
Name: "subscriber_event_queued",
Help: "Event Queued for subscriber",
},
[]string{"subscriber_name"},
)
collectors = []prometheus.Collector{
eventsEmitted,
totalSubscribers,
subscriberQueueLength,
subscriberQueueFull,
subscriberEventQueued,
}
)
// MetricsTracer tracks metrics for the eventbus subsystem
type MetricsTracer interface {
// EventEmitted counts the total number of events grouped by event type
EventEmitted(typ reflect.Type)
// AddSubscriber adds a subscriber for the event type
AddSubscriber(typ reflect.Type)
// RemoveSubscriber removes a subscriber for the event type
RemoveSubscriber(typ reflect.Type)
// SubscriberQueueLength is the length of the subscribers channel
SubscriberQueueLength(name string, n int)
// SubscriberQueueFull tracks whether a subscribers channel if full
SubscriberQueueFull(name string, isFull bool)
// SubscriberEventQueued counts the total number of events grouped by subscriber
SubscriberEventQueued(name string)
}
type metricsTracer struct{}
var _ MetricsTracer = &metricsTracer{}
type metricsTracerSetting struct {
reg prometheus.Registerer
}
type MetricsTracerOption func(*metricsTracerSetting)
func WithRegisterer(reg prometheus.Registerer) MetricsTracerOption {
return func(s *metricsTracerSetting) {
if reg != nil {
s.reg = reg
}
}
}
func NewMetricsTracer(opts ...MetricsTracerOption) MetricsTracer {
setting := &metricsTracerSetting{reg: prometheus.DefaultRegisterer}
for _, opt := range opts {
opt(setting)
}
metricshelper.RegisterCollectors(setting.reg, collectors...)
return &metricsTracer{}
}
func (m *metricsTracer) EventEmitted(typ reflect.Type) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, strings.TrimPrefix(typ.String(), "event."))
eventsEmitted.WithLabelValues(*tags...).Inc()
}
func (m *metricsTracer) AddSubscriber(typ reflect.Type) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, strings.TrimPrefix(typ.String(), "event."))
totalSubscribers.WithLabelValues(*tags...).Inc()
}
func (m *metricsTracer) RemoveSubscriber(typ reflect.Type) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, strings.TrimPrefix(typ.String(), "event."))
totalSubscribers.WithLabelValues(*tags...).Dec()
}
func (m *metricsTracer) SubscriberQueueLength(name string, n int) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, name)
subscriberQueueLength.WithLabelValues(*tags...).Set(float64(n))
}
func (m *metricsTracer) SubscriberQueueFull(name string, isFull bool) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, name)
observer := subscriberQueueFull.WithLabelValues(*tags...)
if isFull {
observer.Set(1)
} else {
observer.Set(0)
}
}
func (m *metricsTracer) SubscriberEventQueued(name string) {
tags := metricshelper.GetStringSlice()
defer metricshelper.PutStringSlice(tags)
*tags = append(*tags, name)
subscriberEventQueued.WithLabelValues(*tags...).Inc()
}