Function GenTestRefSamplesCase

util/testrecord/record.go:35–83

(t testing.TB, c RefSamplesCase)

)

func GenTestRefSamplesCase(t testing.TB, c RefSamplesCase) []record.RefSample {
	t.Helper()

	ret := make([]record.RefSample, 1e3)
	switch c {
	// Samples are across series, so likely all have the same timestamp.
	case Realistic1000Samples:
		for i := range ret {
			ret[i].Ref = chunks.HeadSeriesRef(i)
			ret[i].T = int64(12423423)
			ret[i].V = highVarianceFloat(i)
		}
	// Likely the start times will all be the same with deltas.
	case Realistic1000WithConstSTSamples:
		for i := range ret {
			ret[i].Ref = chunks.HeadSeriesRef(i)
			ret[i].ST = int64(12423423)
			ret[i].T = int64(12423423 + 15)
			ret[i].V = highVarianceFloat(i)
		}
	// Maybe series have different start times though
	case Realistic1000WithVariableSTSamples:
		for i := range ret {
			ret[i].Ref = chunks.HeadSeriesRef(i)
			ret[i].ST = int64((12423423 / 9) * (i % 10))
			ret[i].T = int64(12423423)
			ret[i].V = highVarianceFloat(i)
		}
	case WorstCase1000:
		for i := range ret {
			ret[i].Ref = chunks.HeadSeriesRef(i)
			ret[i].T = highVarianceInt(i)
			ret[i].V = highVarianceFloat(i)
		}
	case WorstCase1000WithSTSamples:
		for i := range ret {
			ret[i].Ref = chunks.HeadSeriesRef(i)

			// Worst case is when the values are significantly different
			// to each other which breaks delta encoding.
			ret[i].ST = highVarianceInt(i+1) / 1024 // Make sure ST is not comparable to T
			ret[i].T = highVarianceInt(i)
			ret[i].V = highVarianceFloat(i)
		}
	default:
		t.Fatal("unknown case", c)
	}
	return ret
}

// HistSTCase selects the start-time pattern for histogram test data generators.
type HistSTCase string