// MeasureHandler adds measuring to http requests
func MeasureHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
m := monitoring.BeginMeasuring(r.URL.Path)
h.ServeHTTP(w, r)
m.EndMeasuring()
})
}
// Test of the ETM monitor.
func TestEtmMonitor(t *testing.T) {
assert := asserts.NewTestingAssertion(t, true)
// Generate measurings.
for i := 0; i < 500; i++ {
n := rand.Intn(10)
id := fmt.Sprintf("mp:task:%d", n)
m := monitoring.BeginMeasuring(id)
work(n * 5000)
m.EndMeasuring()
}
// Need some time to let that backend catch up queued mesurings.
time.Sleep(time.Millisecond)
// Asserts.
mp, err := monitoring.ReadMeasuringPoint("foo")
assert.ErrorMatch(err, `\[E.*\] measuring point "foo" does not exist`, "reading non-existent measuring point")
mp, err = monitoring.ReadMeasuringPoint("mp:task:5")
assert.Nil(err, "No error expected.")
assert.Equal(mp.Id, "mp:task:5", "should get the right one")
assert.True(mp.Count > 0, "should be measured several times")
assert.Match(mp.String(), `Measuring Point "mp:task:5" \(.*\)`, "string representation should look fine")
monitoring.MeasuringPointsDo(func(mp *monitoring.MeasuringPoint) {
assert.Match(mp.Id, "mp:task:[0-9]", "id has to match the pattern")
assert.True(mp.MinDuration <= mp.AvgDuration && mp.AvgDuration <= mp.MaxDuration,
"avg should be somewhere between min and max")
})
}
