40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
/*
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* Copyright The OpenTelemetry Authors
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* SPDX-License-Identifier: Apache-2.0
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*/
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import { isValidTraceId } from '@opentelemetry/api';
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import { SamplingDecision } from '../Sampler';
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/** Sampler that samples a given fraction of traces based of trace id deterministically. */
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export class TraceIdRatioBasedSampler {
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_ratio;
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_upperBound;
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constructor(ratio = 0) {
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this._ratio = this._normalize(ratio);
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this._upperBound = Math.floor(this._ratio * 0xffffffff);
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}
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shouldSample(context, traceId) {
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return {
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decision: isValidTraceId(traceId) && this._accumulate(traceId) < this._upperBound
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? SamplingDecision.RECORD_AND_SAMPLED
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: SamplingDecision.NOT_RECORD,
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};
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}
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toString() {
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return `TraceIdRatioBased{${this._ratio}}`;
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}
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_normalize(ratio) {
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if (typeof ratio !== 'number' || isNaN(ratio))
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return 0;
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return ratio >= 1 ? 1 : ratio <= 0 ? 0 : ratio;
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}
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_accumulate(traceId) {
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let accumulation = 0;
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for (let i = 0; i < traceId.length / 8; i++) {
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const pos = i * 8;
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const part = parseInt(traceId.slice(pos, pos + 8), 16);
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accumulation = (accumulation ^ part) >>> 0;
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}
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return accumulation;
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}
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}
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//# sourceMappingURL=TraceIdRatioBasedSampler.js.map
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