kloudglue-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('kloudglue-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);
};