node-red-contrib-alasql/node-red-contrib-alafile.js

Node-RED wrapper for AlaSQL database and XLSX import/export

/**
 Double backslash for Windows paths
 @param path {string} String with path
 @return {string} Modified path
 @example
 \Program Files\Mysoft => \\Program Files\\Mysoft
 */
function doubleb(path) {
	return path.replace(/\\/g, '\\\\');
}

module.exports = function(RED) {
	var alasql = require('alasql');

	function AlaFileNodeOut(config) {
		RED.nodes.createNode(this, config);
		var node = this;
		node.filename = config.filename;
		node.format = config.format;
		node.columns = config.columns;
		node.headers = config.headers;
		node.on('input', (msg) => {
			var filename = node.filename || msg.filename || '';
			if (filename !== '') {
				node.status({fill: 'green', shape: 'dot', text: ' ' + filename + '.' + this.format});
			}
			if (filename === '') {
				node.warn(RED._('file.errors.nofilename'));
				node.status({
					fill: 'red',
					shape: 'ring',
					text: 'No filename in node config or msg.filename!',
				});
			} else if (msg.hasOwnProperty('payload') && typeof msg.payload !== 'undefined') {
				var sql =
					'SELECT ' +
					this.columns +
					' INTO ' +
					this.format +
					'("' +
					doubleb(filename) +
					'",{headers:' +
					this.headers +
					'}) FROM ?';
				var bind = Array.isArray(msg.payload) ? [msg.payload] : [[msg.payload]];
				alasql
					.promise(sql, bind)
					.then((res) => {
						msg.payload = res;
						node.send(msg);
					})
					.catch((err) => {
						node.error(err, msg);
					});
			} else {
				node.status({
					fill: 'red',
					shape: 'ring',
					text: 'No msg.payload defined with data to output!',
				});
			}
		});
		this.on('close', () => {
			node.status({});
		});
	}

	RED.nodes.registerType('alafile out', AlaFileNodeOut);

	function AlaFileNode(config) {
		RED.nodes.createNode(this, config);
		var node = this;
		node.filename = config.filename;
		node.format = config.format;
		node.columns = config.columns;
		node.headers = config.headers;
		node.on('input', (msg) => {
			var filename = node.filename || msg.filename || '';
			if (filename !== '') {
				node.status({fill: 'green', shape: 'dot', text: ' ' + filename + '.' + this.format});
			}
			if (filename === '') {
				node.warn(RED._('file.errors.nofilename'));
				node.status({
					fill: 'red',
					shape: 'ring',
					text: 'No filename in node config or msg.filename!',
				});
			} else if (msg.hasOwnProperty('payload') && typeof msg.payload !== 'undefined') {
				var sql =
					'SELECT ' +
					this.columns +
					' FROM ' +
					this.format +
					'("' +
					doubleb(filename) +
					'.' +
					this.format +
					'",{headers:' +
					this.headers +
					'})';
				var bind = Array.isArray(msg.payload) ? [msg.payload] : [[msg.payload]];
				if (!require('fs').existsSync(doubleb(filename) + '.' + this.format)) {
					var notExist = ' ' + doubleb(filename) + '.' + this.format + ' does not exist!';
					node.warn(RED._(notExist));
					node.status({fill: 'red', shape: 'ring', text: notExist});
				} else {
					alasql
						.promise(sql, bind)
						.then((res) => {
							msg.payload = res;
							node.send(msg);
						})
						.catch((err) => {
							node.error(err, msg);
						});
				}
			}
		});
		this.on('close', () => {
			node.status({});
		});
	}

	RED.nodes.registerType('alafile in', AlaFileNode);
};