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measurement.go
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measurement.go
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package middleware
import (
"net/http"
"regexp"
"time"
)
type MetricsData struct {
StatusCode int
Method string
Route string
Elapsed time.Duration
}
//go:generate mockery --name=MetricsService --case underscore --testonly --inpackage
type MetricsService interface {
Responded(data MetricsData)
}
var patternPlaceholdersRegxp = regexp.MustCompile(`{([a-zA-Z0-9]+).*?}`)
type responseWriter struct {
w http.ResponseWriter
statusCode int
}
func (w *responseWriter) Header() http.Header {
return w.w.Header()
}
func (w *responseWriter) Write(data []byte) (int, error) {
return w.w.Write(data)
}
func (w *responseWriter) WriteHeader(statusCode int) {
w.statusCode = statusCode
w.w.WriteHeader(statusCode)
}
type MatchedRoutePatternFunc func(r *http.Request) string
func Measurement(next http.Handler, serv MetricsService, patternFunc MatchedRoutePatternFunc) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
start := time.Now()
ww := &responseWriter{w: w}
next.ServeHTTP(ww, req)
var routePattern string
if patternFunc != nil {
routePattern = patternFunc(req)
}
if len(routePattern) > 0 {
routePattern = patternPlaceholdersRegxp.
ReplaceAllString(routePattern, `$1`)
}
serv.Responded(MetricsData{
StatusCode: ww.statusCode,
Method: req.Method,
Route: routePattern,
Elapsed: time.Since(start),
})
})
}
func MeasurementN(serv MetricsService, patternFunc MatchedRoutePatternFunc) func(next http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return Measurement(next, serv, patternFunc)
}
}