node-red-contrib-services-mentor/services/delete-info-db.js

Mentor Services

var mysql = require('mysql');

module.exports = function(RED) {
  var log = RED.log;
  
  function Node(config) {
    RED.nodes.createNode(this, config);
    var node = this;
    
    this.mydbConfig = RED.nodes.getNode(config.mysql);
    
    this.interval = config.interval;

    this.mentor = RED.nodes.getNode(config.mentor);
    
    this.mentor_id = 0;
    if (this.mentor) this.mentor_id = this.mentor.mentor_id;
    
    if (this.mydbConfig) {
      this.mydbConfig.connect();
      var node = this;
      var busy = false;
      var status = {};
      node.mydbConfig.on("state", function(info) {
          if (info === "connecting") { node.status({fill:"grey",shape:"ring",text:info}); }
          else if (info === "connected") { node.status({fill:"green",shape:"dot",text:info}); }
          else {
              if (info === "ECONNREFUSED") { info = "connection refused"; }
              if (info === "PROTOCOL_CONNECTION_LOST") { info = "connection lost"; }
              node.status({fill:"red",shape:"ring",text:info});
          }
      });

      node.on("input", function(msg) {
          if (node.mydbConfig.connected) {
            var obj = JSON.parse(msg.payload);
            msg.code = obj.code;
            msg.time = obj.time;
            msg.mentor_id = node.mentor_id;
            msg.result = 1;
            deleteMysql(node, msg);
          }
          else {
              node.error("Database not connected",msg);
              status = {fill:"red",shape:"ring",text:"not yet connected"};
          }
          if (!busy) {
              busy = true;
              node.status(status);
              node.tout = setTimeout(function() { busy = false; node.status(status); },500);
          }
        });

        node.on('close', function () {
            if (node.tout) { clearTimeout(node.tout); }
            node.mydbConfig.removeAllListeners();
            node.status({});
        });
      }
    else {
        this.error("MySQL database not configured");
    }
  }
  
  function deleteMysql(node, msg)
  {
        var sql = "Delete from mqtt_lecturas WHere Date(FROM_UNIXTIME(time * 0.001)) < DATE_SUB(now(), INTERVAL " + node.interval + " DAY)";
        if (node.mentor_id > 0)
          sql += " AND mentor_id = "+ node.mentor_id;  
        node.mydbConfig.connection.query(sql, [], function(err, rows) {
          if (err) { log.error(err);}
          else
            node.send({payload: {msg:  "Number of records deleted: " + rows.affectedRows, data:msg}});
        });
  }
  
  RED.nodes.registerType("DelInfoDB", Node);
}