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

Multiplayer otlp core

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MultiplayerTraceIdRatioBasedSampler = void 0;
const api_1 = require("@opentelemetry/api");
const sdk_trace_base_1 = require("@opentelemetry/sdk-trace-base");
const constants_base_1 = require("./constants.base");
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(constants_base_1.MULTIPLAYER_TRACE_DEBUG_PREFIX)) {
            return {
                decision: sdk_trace_base_1.SamplingDecision.RECORD_AND_SAMPLED,
            };
        }
        let decision = sdk_trace_base_1.SamplingDecision.NOT_RECORD;
        if ((0, api_1.isValidTraceId)(traceId)
            && this._accumulate(traceId) < this._upperBound) {
            decision = sdk_trace_base_1.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;
    }
}
exports.MultiplayerTraceIdRatioBasedSampler = MultiplayerTraceIdRatioBasedSampler;
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