@opentelemetry/tracing/build/esm/config.js

/*
 * Copyright The OpenTelemetry Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { diag } from '@opentelemetry/api';
import { AlwaysOffSampler, AlwaysOnSampler, getEnv, TracesSamplerValues, ParentBasedSampler, TraceIdRatioBasedSampler, } from '@opentelemetry/core';
var env = getEnv();
var FALLBACK_OTEL_TRACES_SAMPLER = TracesSamplerValues.AlwaysOn;
/**
 * Default configuration. For fields with primitive values, any user-provided
 * value will override the corresponding default value. For fields with
 * non-primitive values (like `spanLimits`), the user-provided value will be
 * used to extend the default value.
 */
export var DEFAULT_CONFIG = {
    sampler: buildSamplerFromEnv(env),
    forceFlushTimeoutMillis: 30000,
    spanLimits: {
        attributeCountLimit: getEnv().OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT,
        linkCountLimit: getEnv().OTEL_SPAN_LINK_COUNT_LIMIT,
        eventCountLimit: getEnv().OTEL_SPAN_EVENT_COUNT_LIMIT,
    },
};
/**
 * Based on environment, builds a sampler, complies with specification.
 * @param env optional, by default uses getEnv(), but allows passing a value to reuse parsed environment
 */
export function buildSamplerFromEnv(env) {
    if (env === void 0) { env = getEnv(); }
    switch (env.OTEL_TRACES_SAMPLER) {
        case TracesSamplerValues.AlwaysOn:
            return new AlwaysOnSampler();
        case TracesSamplerValues.AlwaysOff:
            return new AlwaysOffSampler();
        case TracesSamplerValues.ParentBasedAlwaysOn:
            return new ParentBasedSampler({
                root: new AlwaysOnSampler(),
            });
        case TracesSamplerValues.ParentBasedAlwaysOff:
            return new ParentBasedSampler({
                root: new AlwaysOffSampler(),
            });
        case TracesSamplerValues.TraceIdRatio:
            return new TraceIdRatioBasedSampler(getSamplerProbabilityFromEnv(env));
        case TracesSamplerValues.ParentBasedTraceIdRatio:
            return new ParentBasedSampler({
                root: new TraceIdRatioBasedSampler(getSamplerProbabilityFromEnv(env)),
            });
        default:
            diag.error("OTEL_TRACES_SAMPLER value \"" + env.OTEL_TRACES_SAMPLER + " invalid, defaulting to " + FALLBACK_OTEL_TRACES_SAMPLER + "\".");
            return new AlwaysOnSampler();
    }
}
var DEFAULT_RATIO = 1;
function getSamplerProbabilityFromEnv(env) {
    if (env.OTEL_TRACES_SAMPLER_ARG === undefined ||
        env.OTEL_TRACES_SAMPLER_ARG === '') {
        diag.error("OTEL_TRACES_SAMPLER_ARG is blank, defaulting to " + DEFAULT_RATIO + ".");
        return DEFAULT_RATIO;
    }
    var probability = Number(env.OTEL_TRACES_SAMPLER_ARG);
    if (isNaN(probability)) {
        diag.error("OTEL_TRACES_SAMPLER_ARG=" + env.OTEL_TRACES_SAMPLER_ARG + " was given, but it is invalid, defaulting to " + DEFAULT_RATIO + ".");
        return DEFAULT_RATIO;
    }
    if (probability < 0 || probability > 1) {
        diag.error("OTEL_TRACES_SAMPLER_ARG=" + env.OTEL_TRACES_SAMPLER_ARG + " was given, but it is out of range ([0..1]), defaulting to " + DEFAULT_RATIO + ".");
        return DEFAULT_RATIO;
    }
    return probability;
}
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