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postgres.js
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postgres.js
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/**
* Copyright 2013 Kris Daniels.
*
* 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.
**/
var { Pool } = require('pg');
var named = require('node-postgres-named');
var querystring = require('querystring');
module.exports = (RED) => {
function getField(node, kind, value) {
switch (kind) {
case 'flow': {
return node.context().flow.get(value);
}
case 'global': {
return node.context().global.get(value);
}
case 'num': {
return parseInt(value);
}
case 'bool': {
return JSON.parse(value);
}
case 'env': {
return process.env[value];
}
default: {
return value;
}
}
}
RED.httpAdmin.get('/postgresdb/:id', (req, res) => {
var credentials = RED.nodes.getCredentials(req.params.id);
if (credentials) {
res.send(JSON.stringify({
user: credentials.user,
hasPassword: (credentials.password && credentials.password != "")
}));
} else {
res.send(JSON.stringify({}));
}
});
RED.httpAdmin.delete('/postgresdb/:id', (req, res) => {
RED.nodes.deleteCredentials(req.params.id);
res.send(200);
});
RED.httpAdmin.post('/postgresdb/:id', (req, res) => {
var body = "";
req.on('data', (chunk) => {
body += chunk;
});
req.on('end', () => {
var newCreds = querystring.parse(body);
var credentials = RED.nodes.getCredentials(req.params.id) || {};
if (newCreds.user == null || newCreds.user == "") {
delete credentials.user;
} else {
credentials.user = newCreds.user;
}
if (newCreds.password == "") {
delete credentials.password;
} else {
credentials.password = newCreds.password || credentials.password;
}
RED.nodes.addCredentials(req.params.id, credentials);
res.send(200);
});
});
const PostgresDatabaseNode = function(n) {
const node = this;
RED.nodes.createNode(node, n);
node.name = n.name;
node.hostname = n.hostname;
node.hostFieldType = n.hostFieldType;
node.port = n.port;
node.portFieldType = n.portFieldType;
node.db = n.db;
node.dbFieldType = n.dbFieldType;
node.user = n.user;
node.userFieldType = n.userFieldType;
node.password = n.password;
node.passwordFieldType = n.passwordFieldType;
this.hostname = getField(node, n.hostFieldType, n.hostname);
this.port = getField(node, n.portFieldType, n.port);
this.db = getField(node, n.dbFieldType, n.db);
this.user = getField(node, n.userFieldType, n.user);
this.password = getField(node, n.passwordFieldType, n.password);
this.ssl = n.ssl;
}
RED.nodes.registerType("postgresdb", PostgresDatabaseNode);
const PostgresNode = function(n) {
RED.nodes.createNode(this, n);
var node = this;
node.topic = n.topic;
node.postgresdb = n.postgresdb;
node.postgresConfig = RED.nodes.getNode(this.postgresdb);
node.sqlquery = n.sqlquery;
node.output = n.output;
if (node.postgresConfig) {
var connectionConfig = {
user: node.postgresConfig.user,
password: node.postgresConfig.password,
host: node.postgresConfig.hostname,
port: node.postgresConfig.port,
database: node.postgresConfig.db,
ssl: node.postgresConfig.ssl
};
var handleError = (err, msg) => {
//node.error(msg); This line is committed and edited to take the msg object also.
// This allows the error to be caught with a Catch node.
node.error(err, msg);
console.log(err);
console.log(msg.payload);
};
var pool = new Pool(connectionConfig);
node.on('input', async (msg, send, done) => {
if (!Array.isArray(msg.payload)) {
// Useful error message for transitioning from `postgres` to `postgres-multi`
handleError(new Error('msg.payload must be an array of queries'));
return;
}
try {
const client = await pool.connect();
named.patch(client);
const queries = msg.payload.slice();
const outMsg = Object.assign({}, msg);
if (node.output) {
outMsg.payload = [];
}
var queryError = false;
var _queryCounts = [];
for (let i=0; i < queries.length; ++i) {
try {
const { query, params = {}, output = false } = queries[i];
const result = await client.query(query, params);
if (output && node.output) {
// Save count of rows returned by a query
_queryCounts.push(result.rows.length);
outMsg.payload = outMsg.payload.concat(result.rows);
}
} catch (e) {
// Assign -1 to result count to indicate query failure
_queryCounts.push(-1);
handleError(e, msg);
} finally {
msg._queryCounts = _queryCounts;
}
}
client.release();
if (node.output) {
// Save count of rows in payload
outMsg._queryCounts = _queryCounts;
node.send(outMsg);
}
} catch(e) {
handleError(e, msg);
}
if (done) {
done();
}
});
} else {
this.error("missing postgres configuration");
}
}
RED.nodes.registerType("postgres", PostgresNode);
};