39 lines
944 B
Go
39 lines
944 B
Go
package main
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import (
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"fmt"
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"time"
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"github.com/go-kit/kit/metrics"
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)
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type instrumentingMiddleware struct {
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requestCount metrics.Counter
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requestLatency metrics.Histogram
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countResult metrics.Histogram
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next StringService
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}
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func (mw instrumentingMiddleware) Uppercase(s string) (output string, err error) {
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defer func(begin time.Time) {
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lvs := []string{"method", "uppercase", "error", fmt.Sprint(err != nil)}
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mw.requestCount.With(lvs...).Add(1)
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mw.requestLatency.With(lvs...).Observe(time.Since(begin).Seconds())
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}(time.Now())
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output, err = mw.next.Uppercase(s)
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return
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}
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func (mw instrumentingMiddleware) Count(s string) (n int) {
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defer func(begin time.Time) {
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lvs := []string{"method", "count", "error", "false"}
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mw.requestCount.With(lvs...).Add(1)
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mw.requestLatency.With(lvs...).Observe(time.Since(begin).Seconds())
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mw.countResult.Observe(float64(n))
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}(time.Now())
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n = mw.next.Count(s)
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return
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}
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