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/*
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 *  This file is part of CoCalc: Copyright © 2022 Sagemath, Inc.
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 *  License: MS-RSL – see LICENSE.md for details
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 */
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import { writeFile } from "node:fs/promises";
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import { session_id, start_ts } from "@cocalc/project/consts";
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import {
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  projectPidFile,
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  sessionIDFile,
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  startTimestampFile,
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} from "@cocalc/project/data";
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import { pidUpdateIntervalMs } from "@cocalc/util/project-info";
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import { getLogger } from "@cocalc/project/logger";
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const logger = getLogger("pid-file");
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export default async function init() {
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  logger.debug("init -- writing out initial pid file info");
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  await Promise.all([
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    writeFile(projectPidFile, `${process.pid}`),
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    writeFile(startTimestampFile, `${start_ts}`),
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    writeFile(sessionIDFile, `${session_id}`),
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  ]);
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  // we also write the pid file out periodically so that the server
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  // knows *this* particular project is really alive and working.
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  setInterval(async () => {
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    try {
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      logger.debug("updating ", projectPidFile);
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      await writeFile(projectPidFile, `${process.pid}`);
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    } catch (err) {
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      // this will likely result in the server killing the project...
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      logger.debug("ERROR updating ", projectPidFile, err);
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    }
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  }, pidUpdateIntervalMs);
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}
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