Function observe

lib/histogram.js:231–263

(labels)

}

function observe(labels) {
	return value => {
		const labelValuePair = convertLabelsAndValues(labels, value);

		validateLabel(this.labelNames, labelValuePair.labels);
		if (!Number.isFinite(labelValuePair.value)) {
			throw new TypeError(
				`Value is not a valid number: ${util.format(labelValuePair.value)}`,
			);
		}

		const hash = hashObject(labelValuePair.labels, this.sortedLabelNames);
		let valueFromMap = this.hashMap[hash];
		if (!valueFromMap) {
			valueFromMap = createBaseValues(
				labelValuePair.labels,
				this.bucketValues,
				this.bucketExemplars,
			);
		}

		const b = findBound(this.upperBounds, labelValuePair.value);

		valueFromMap.sum += labelValuePair.value;
		valueFromMap.count += 1;

		if (Object.prototype.hasOwnProperty.call(valueFromMap.bucketValues, b)) {
			valueFromMap.bucketValues[b] += 1;
		}

		this.hashMap[hash] = valueFromMap;
	};
}

function createBaseValues(labels, bucketValues, bucketExemplars) {
	const result = {