@tangelo/tangelo-configuration-toolkit/src/lib/remote-exec.js

Tangelo Configuration Toolkit is a command-line toolkit which offers support for developing a Tangelo configuration.

const {NodeSSH} = require('node-ssh');
const pLimit    = require('p-limit');


module.exports = class RemoteExec {

  #ftpConfig;
  #queue = [];

  constructor(ftpConfig) {
    this.#ftpConfig = ftpConfig;
  }

  add(cmd, msg) {
    if (!this.#queue.find(e => e[0]==cmd)) this.#queue.push([cmd, msg]);
    return this;
  }

  async process() {
    if (!this.#queue[0]) return;

    const sshI = new NodeSSH();
    const limit = pLimit(this.#ftpConfig.parallel);

    await sshI.connect(this.#ftpConfig) // set up connection once
      .then(() => Promise.all(this.#queue.map(([cmd, msg]) => limit(
        () => sshI.execCommand(cmd).then(result => {
          if (result.stderr) _warn(result.stderr);
          else if (msg === 'STDOUT') _write(result.stdout);
          else if (msg) _info(msg === 'CMD' ? cmd : msg);
        })
      ))))
      .catch(err => {
        if (err.code=='ECONNRESET' || err.code=='ECONNABORTED') _warn(`Server aborted connection. Retrying.`);
        else _warn(err);
        this.process(); // retry set up connection
      })
      .finally(() => {
        sshI.dispose();
        this.#queue = [];
      });
  }

};