solarwinds-apm/dist/sampling/json.js

OpenTelemetry-based SolarWinds APM library

/*
Copyright 2023-2025 SolarWinds Worldwide, LLC.

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

    http://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 fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { context } from "@opentelemetry/api";
import { suppressTracing } from "@opentelemetry/core";
import { componentLogger } from "../shared/logger.js";
import { Sampler } from "./sampler.js";
const PATH = path.join(os.tmpdir(), "solarwinds-apm-settings.json");
export class JsonSampler extends Sampler {
    #path;
    #expiry = Date.now();
    constructor(config, path = PATH) {
        super(config, componentLogger(JsonSampler));
        this.#path = path;
        this.#loop();
    }
    shouldSample(...params) {
        this.#loop();
        return super.shouldSample(...params);
    }
    toString() {
        return `JSON Sampler (${this.#path})`;
    }
    #loop() {
        // update if we're within 10s of expiry
        if (Date.now() + 10 * 1000 < this.#expiry) {
            return;
        }
        let unparsed;
        try {
            const contents = context.with(suppressTracing(context.active()), () => fs.readFileSync(this.#path, { encoding: "utf-8" }));
            unparsed = JSON.parse(contents);
        }
        catch (error) {
            this.logger.debug("missing or invalid settings file", error);
            return;
        }
        if (!Array.isArray(unparsed) || unparsed.length !== 1) {
            this.logger.debug("invalid settings file", unparsed);
            return;
        }
        const parsed = this.updateSettings(unparsed[0]);
        if (parsed) {
            this.#expiry = (parsed.timestamp + parsed.ttl) * 1000;
        }
    }
}
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