41 lines
1.0 KiB
Go
41 lines
1.0 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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// +build !test
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package api
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import (
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"time"
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"github.com/go-kit/kit/metrics"
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"github.com/mainflux/mainflux/readers"
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)
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var _ readers.MessageRepository = (*metricsMiddleware)(nil)
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type metricsMiddleware struct {
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counter metrics.Counter
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latency metrics.Histogram
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svc readers.MessageRepository
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}
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// MetricsMiddleware instruments core service by tracking request count and
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// latency.
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func MetricsMiddleware(svc readers.MessageRepository, counter metrics.Counter, latency metrics.Histogram) readers.MessageRepository {
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return &metricsMiddleware{
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counter: counter,
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latency: latency,
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svc: svc,
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}
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}
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func (mm *metricsMiddleware) ReadAll(chanID string, offset, limit uint64, query map[string]string) (readers.MessagesPage, error) {
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defer func(begin time.Time) {
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mm.counter.With("method", "read_all").Add(1)
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mm.latency.With("method", "read_all").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return mm.svc.ReadAll(chanID, offset, limit, query)
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}
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