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node-red-nodes/storage/postgres/110-postgres.js

88 lines
3.2 KiB
JavaScript

/**
* Copyright 2013, 2015 Kris Daniels, 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) {
var pg=require('pg');
var named=require('node-postgres-named');
var querystring = require('querystring');
function PostgresDatabaseNode(n) {
RED.nodes.createNode(this,n);
this.hostname = n.hostname;
this.port = n.port;
this.db = n.db;
this.user = this.credentials.user;
this.password = this.credentials.password;
}
RED.nodes.registerType("postgresdb",PostgresDatabaseNode,{
credentials: {
user: {type:"text"},
password: {type: "password"}
}
});
function PostgresNode(n) {
RED.nodes.createNode(this,n);
this.topic = n.topic;
this.postgresdb = n.postgresdb;
this.postgresConfig = RED.nodes.getNode(this.postgresdb);
this.sqlquery = n.sqlquery;
this.output = n.output;
var node = this;
if(this.postgresConfig)
{
var conString = 'postgres://'+this.postgresConfig.user +':' + this.postgresConfig.password + '@' + this.postgresConfig.hostname + ':' + this.postgresConfig.port + '/' + this.postgresConfig.db;
node.clientdb = new pg.Client(conString);
named.patch(node.clientdb);
node.clientdb.connect(function(err){
if(err) { node.error(err); }
else {
node.on('input',
function(msg){
if(!msg.queryParameters) msg.queryParameters={};
node.clientdb.query(msg.payload,
msg.queryParameters,
function (err, results) {
if(err) { node.error(err); }
else {
if(node.output)
{
msg.payload = results.rows;
node.send(msg);
}
}
});
});
}
});
} else {
this.error("missing postgres configuration");
}
this.on("close", function() {
if(node.clientdb) node.clientdb.end();
});
}
RED.nodes.registerType("postgres",PostgresNode);
}