@multiplayer-app/otlp-core/dist/esnext/MultiplayerTraceIdRatioBasedSampler.js

Multiplayer otlp core

import { isValidTraceId } from '@opentelemetry/api';
import { SamplingDecision, } from '@opentelemetry/sdk-trace-base';
import { MULTIPLAYER_TRACE_DEBUG_PREFIX } from './constants.base';
export class MultiplayerTraceIdRatioBasedSampler {
    constructor(_ratio = 0) {
        this._ratio = _ratio;
        this._ratio = this._normalize(_ratio);
        this._upperBound = Math.floor(this._ratio * 0xffffffff);
    }
    shouldSample(context, traceId) {
        if (this._ratio > 0
            && traceId.startsWith(MULTIPLAYER_TRACE_DEBUG_PREFIX)) {
            return {
                decision: SamplingDecision.RECORD_AND_SAMPLED,
            };
        }
        let decision = SamplingDecision.NOT_RECORD;
        if (isValidTraceId(traceId)
            && this._accumulate(traceId) < this._upperBound) {
            decision = SamplingDecision.RECORD_AND_SAMPLED;
        }
        return { decision };
    }
    toString() {
        return `MultiplayerTraceIdRatioBasedSampler{${this._ratio}}`;
    }
    _normalize(ratio) {
        if (typeof ratio !== 'number' || isNaN(ratio))
            return 0;
        return ratio >= 1 ? 1 : ratio <= 0 ? 0 : ratio;
    }
    _accumulate(traceId) {
        let accumulation = 0;
        for (let i = 0; i < traceId.length / 8; i++) {
            const pos = i * 8;
            const part = parseInt(traceId.slice(pos, pos + 8), 16);
            accumulation = (accumulation ^ part) >>> 0;
        }
        return accumulation;
    }
}
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