103 lines
3.5 KiB
JavaScript
103 lines
3.5 KiB
JavaScript
/**
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* Copyright 2017 Vincent Schoonenburg.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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module.exports = function(RED) {
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var pg = require('pg');
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function Notify(n) {
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RED.nodes.createNode(this,n);
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this.postgresdb = n.postgresdb;
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this.postgresConfig = RED.nodes.getNode(this.postgresdb);
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this.channel = n.channel;
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console.log(this.channel);
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var node = this;
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var clientdb = null;
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this.status({fill:"red",shape:"ring",text:"disconnected"});
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if(this.postgresConfig) {
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try {
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var config = {};
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if (node.postgresConfig.connectionString) {
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config = node.postgresConfig.connectionString
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} else {
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if (node.postgresConfig.user) { config.user = node.postgresConfig.user; }
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if (node.postgresConfig.password) { config.password = node.postgresConfig.password; }
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if (node.postgresConfig.hostname) { config.host = node.postgresConfig.hostname; }
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if (node.postgresConfig.port) { config.port = node.postgresConfig.port; }
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if (node.postgresConfig.db) { config.database = node.postgresConfig.db; }
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config.ssl = node.postgresConfig.ssl;
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}
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clientdb = new pg.Client(config);
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clientdb.connect(function(err) {
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try {
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if(err) {
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console.log(err);
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node.error(err);
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} else {
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console.log("Connected");
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node.status({fill:"green",shape:"dot",text:"connected"});
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clientdb.on('notification', function(msg) {
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console.log("Notification received");
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msg.payload = JSON.parse(msg.payload);
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node.log(JSON.stringify(msg));
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node.send(msg);
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});
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var query = "LISTEN " + node.channel;
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clientdb.query(query);
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console.log("Listening to :" + node.channel);
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}
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} catch (error) {
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node.error(error);
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}
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});
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} catch (err) {
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node.error(err);
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}
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} else {
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this.error("missing postgres configuration");
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}
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this.on("close", function() {
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if(node.clientdb) node.clientdb.end();
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});
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}
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function PostgresArrayNode(n) {
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RED.nodes.createNode(this,n);
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try {
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this.columns = JSON.parse(n.columns);
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} catch (e) {
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node.error(e.message);
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this.columns = [];
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}
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}
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try {
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RED.nodes.registerType("postgresarray",PostgresArrayNode);
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} catch (e) {
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}
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RED.nodes.registerType("PG Listen",Notify);
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};
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