75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package api
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import (
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"context"
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"time"
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"github.com/go-kit/kit/metrics"
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notifiers "github.com/mainflux/mainflux/consumers/notifiers"
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)
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var _ notifiers.Service = (*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 notifiers.Service
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}
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// MetricsMiddleware instruments core service by tracking request count and latency.
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func MetricsMiddleware(svc notifiers.Service, counter metrics.Counter, latency metrics.Histogram) notifiers.Service {
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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 (ms *metricsMiddleware) CreateSubscription(ctx context.Context, token string, sub notifiers.Subscription) (string, error) {
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defer func(begin time.Time) {
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ms.counter.With("method", "create_subscription").Add(1)
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ms.latency.With("method", "create_subscription").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return ms.svc.CreateSubscription(ctx, token, sub)
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}
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func (ms *metricsMiddleware) ViewSubscription(ctx context.Context, token, topic string) (notifiers.Subscription, error) {
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defer func(begin time.Time) {
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ms.counter.With("method", "view_subscription").Add(1)
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ms.latency.With("method", "view_subscription").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return ms.svc.ViewSubscription(ctx, token, topic)
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}
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func (ms *metricsMiddleware) ListSubscriptions(ctx context.Context, token string, pm notifiers.PageMetadata) (notifiers.Page, error) {
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defer func(begin time.Time) {
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ms.counter.With("method", "list_subscriptions").Add(1)
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ms.latency.With("method", "list_subscriptions").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return ms.svc.ListSubscriptions(ctx, token, pm)
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}
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func (ms *metricsMiddleware) RemoveSubscription(ctx context.Context, token, id string) error {
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defer func(begin time.Time) {
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ms.counter.With("method", "remove_subscription").Add(1)
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ms.latency.With("method", "remove_subscription").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return ms.svc.RemoveSubscription(ctx, token, id)
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}
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func (ms *metricsMiddleware) Consume(msg interface{}) error {
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defer func(begin time.Time) {
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ms.counter.With("method", "consume").Add(1)
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ms.latency.With("method", "consume").Observe(time.Since(begin).Seconds())
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}(time.Now())
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return ms.svc.Consume(msg)
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}
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