@cocalc/project/dist/port_manager.js

CoCalc: project daemon

// Generated by CoffeeScript 2.5.1
(function() {
  //########################################################################
  // This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.
  // License: AGPLv3 s.t. "Commons Clause" – see LICENSE.md for details
  //########################################################################
  /*
  The port_manager manages the ports for the various servers.

  It reads the port from memory or from disk and returns it.
  */
  var SMC, fs, misc_node, port_file, ports;

  fs = require('fs');

  misc_node = require('@cocalc/backend/misc_node');

  SMC = process.env.SMC;

  exports.port_file = port_file = function(type) {
    return `${SMC}/${type}_server/${type}_server.port`;
  };

  ports = {};

  exports.get_port = function(type, cb) { // cb(err, port number)
    if (ports[type] != null) {
      return cb(false, ports[type]);
    } else {
      return fs.readFile(misc_node.abspath(port_file(type)), function(err, content) {
        var e;
        if (err) {
          return cb(err);
        } else {
          try {
            ports[type] = parseInt(content);
            return cb(false, ports[type]);
          } catch (error) {
            e = error;
            return cb(`${type}_server port file corrupted`);
          }
        }
      });
    }
  };

  exports.forget_port = function(type) {
    if (ports[type] != null) {
      return delete ports[type];
    }
  };

}).call(this);

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