Node.js PostgreSQL requests are being terminated prematurely - sql

Question

I´m trying to perform updates on a PostgreSQL db using node but I´m getting an Error: Connection terminated performing UPDATE operation. I´ve probably messed up when handling the connections in a proper async way prematurely terminated them but can´t wrap my head on how I could perform that correctly.
Sorry for the big lump of code but it is pretty straightforward.
//main.js
var result = require('./processes.js');
result.check(function(message) {
console.log(message);
});
result.decrease(); //Throws an error.
//workers.js
var pg = require ('pg');
var fs = require('fs');
var db = JSON.parse(fs.readFileSync('../config.json', 'utf8')).db;
var querydb = require('./querydb.js');
var self = module.exports = {
check: function(callback) {
querydb.select("SELECT size FROM workers WHERE id = 1", function(results) {
callback(results[0].size);
});
},
increase: function() {
self.check(function(workers) {
querydb.update("UPDATE workers SET size = " + (workers + 1) + " WHERE id = 1");
});
},
decrease: function() {
self.check(function(workers) {
querydb.update("UPDATE workers SET size = " + (workers - 1) + " WHERE id = 1");
});
}
};
//querydb.js
var pg = require ('pg');
var fs = require('fs');
var db = JSON.parse(fs.readFileSync('../config.json', 'utf8')).db;
var select = function(statement, callback) {
pg.connect(db, function(err, client, done) {
var results = [];
//Handle errors
if(err) {
done();
console.log(err);
}
var query = client.query(statement);
//Stream results back
query.on('row', function(row) {
results.push(row);
});
//When all data is returned.
query.on('end', function() {
done();
callback(results);
client.end();
});
});
}
var update = function(statement) {
pg.connect(db, function(err, client, done) {
var results = [];
//Handle errors
if(err) {
done();
console.log(err);
}
var query = client.query(statement);
//When all data is returned.
query.on('end', function() {
done();
client.end();
});
});
}
module.exports = {
select: select,
update: update
};

Answer 1

Ok, this maybe isn´t an answer per se and more of a workaround but having synchronous calls for this kind of script (i.e. not a web server) was the desired behavior I wanted so I ended up going with pg-native instead of pg and refactored my querydb and workers modules to use it and now everything works!