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labels.go
48 lines (37 loc) · 935 Bytes
/
labels.go
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package metrics
import (
"context"
"github.com/ThreeDotsLabs/watermill/message"
"github.com/prometheus/client_golang/prometheus"
)
const (
labelKeyHandlerName = "handler_name"
labelKeyPublisherName = "publisher_name"
labelKeySubscriberName = "subscriber_name"
labelSuccess = "success"
labelAcked = "acked"
labelValueNoHandler = "<no handler>"
)
var (
labelGetters = map[string]func(context.Context) string{
labelKeyHandlerName: message.HandlerNameFromCtx,
labelKeyPublisherName: message.PublisherNameFromCtx,
labelKeySubscriberName: message.SubscriberNameFromCtx,
}
)
func labelsFromCtx(ctx context.Context, labels ...string) prometheus.Labels {
ctxLabels := map[string]string{}
for _, l := range labels {
k := l
ctxLabels[l] = ""
getter, ok := labelGetters[k]
if !ok {
continue
}
v := getter(ctx)
if v != "" {
ctxLabels[l] = v
}
}
return ctxLabels
}