prisme-flow/nodes/bridge/sqlite/sqlite.js

prisme platform flow engine

/**
 * Created by prisme.io on 09/06/2017.
 */
module.exports = function (RED) {
  'use strict'
  var reconnect = RED.settings.sqliteReconnectTime || 20000
  var sqlite3 = require('sqlite3')

  function SqliteNodeDB (n) {
    RED.nodes.createNode(this, n)

    this.dbname = n.db
    var node = this

    node.doConnect = function () {
      node.db = new sqlite3.Database(node.dbname)
      node.db.on('open', function () {
        if (node.tick) { clearTimeout(node.tick) }
        node.log('opened ' + node.dbname + ' ok')
      })
      node.db.on('error', function (err) {
        node.error('failed to open ' + node.dbname, err)
        node.tick = setTimeout(function () { node.doConnect() }, reconnect)
      })
    }

    node.on('close', function () {
      if (node.tick) { clearTimeout(node.tick) }
      if (node.db) { node.db.close() }
    })
  }
  RED.nodes.registerType('sqlitedb', SqliteNodeDB)

  function SqliteNodeIn (n) {
    RED.nodes.createNode(this, n)
    this.mydb = n.mydb
    this.mydbConfig = RED.nodes.getNode(this.mydb)

    if (this.mydbConfig) {
      this.mydbConfig.doConnect()
      var node = this
      node.on('input', function (msg) {
        if (typeof msg.topic === 'string') {
                    // console.log("query:",msg.topic);
          var bind = Array.isArray(msg.payload) ? msg.payload : []
          node.mydbConfig.db.all(msg.topic, bind, function (err, row) {
            if (err) { node.error(err, msg) } else {
              msg.payload = row
              node.send(msg)
            }
          })
        } else {
          if (typeof msg.topic !== 'string') {
            node.error('msg.topic : the query is not defined as a string', msg)
          }
        }
      })
    } else {
      this.error('Sqlite database not configured')
    }
  }
  RED.nodes.registerType('sqlite', SqliteNodeIn)
}