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node-red-nodes/storage/sqlite/sqlite.js

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/**
* Copyright 2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
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(err) {
if (node.tick) { clearTimeout(node.tick); }
node.log("opened "+node.dbname+" ok");
});
node.db.on('error', function(err) {
node.error(err);
node.log("failed to open "+node.dbname);
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);
}