44 lines
998 B
Go
44 lines
998 B
Go
//
|
|
// Copyright (c) 2018
|
|
// Mainflux
|
|
//
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
//
|
|
|
|
package api
|
|
|
|
import (
|
|
"time"
|
|
|
|
"github.com/go-kit/kit/metrics"
|
|
"github.com/mainflux/mainflux"
|
|
"github.com/mainflux/mainflux/normalizer"
|
|
)
|
|
|
|
var _ normalizer.Service = (*metricsMiddleware)(nil)
|
|
|
|
type metricsMiddleware struct {
|
|
counter metrics.Counter
|
|
latency metrics.Histogram
|
|
svc normalizer.Service
|
|
}
|
|
|
|
// MetricsMiddleware instruments core service by tracking request count and
|
|
// latency.
|
|
func MetricsMiddleware(svc normalizer.Service, counter metrics.Counter, latency metrics.Histogram) normalizer.Service {
|
|
return &metricsMiddleware{
|
|
counter: counter,
|
|
latency: latency,
|
|
svc: svc,
|
|
}
|
|
}
|
|
|
|
func (mm *metricsMiddleware) Normalize(msg mainflux.RawMessage) (normalizer.NormalizedData, error) {
|
|
defer func(begin time.Time) {
|
|
mm.counter.With("method", "normalize").Add(1)
|
|
mm.latency.With("method", "normalize").Observe(time.Since(begin).Seconds())
|
|
}(time.Now())
|
|
|
|
return mm.svc.Normalize(msg)
|
|
}
|