Method sampleKey

profile/merge.go:196–246

(sample *Sample)

}

func (pm *profileMerger) sampleKey(sample *Sample) sampleKey {
	// Accumulate contents into a string.
	var buf strings.Builder
	buf.Grow(64) // Heuristic to avoid extra allocs

	// encode a number
	putNumber := func(v uint64) {
		var num [binary.MaxVarintLen64]byte
		n := binary.PutUvarint(num[:], v)
		buf.Write(num[:n])
	}

	// encode a string prefixed with its length.
	putDelimitedString := func(s string) {
		putNumber(uint64(len(s)))
		buf.WriteString(s)
	}

	for _, l := range sample.Location {
		// Get the location in the merged profile, which may have a different ID.
		if loc := pm.mapLocation(l); loc != nil {
			putNumber(loc.ID)
		}
	}
	putNumber(0) // Delimiter

	for _, l := range sortedKeys1(sample.Label) {
		putDelimitedString(l)
		values := sample.Label[l]
		putNumber(uint64(len(values)))
		for _, v := range values {
			putDelimitedString(v)
		}
	}

	for _, l := range sortedKeys2(sample.NumLabel) {
		putDelimitedString(l)
		values := sample.NumLabel[l]
		putNumber(uint64(len(values)))
		for _, v := range values {
			putNumber(uint64(v))
		}
		units := sample.NumUnit[l]
		putNumber(uint64(len(units)))
		for _, v := range units {
			putDelimitedString(v)
		}
	}

	return sampleKey(buf.String())
}

type sampleKey string