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PlasmaJs.js
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240 lines (221 loc) · 7.64 KB
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import pkg from 'pg';
const { Pool } = pkg;
class PlasmaJs{
/**
* Query method with callback
* @param query
* @param parameters
* @param callback
*/
query(query, parameters, callback){
const currentStack = new Error();
let _this = this;
let internal_query = function(query, parameters, callback){
if(parameters !== undefined && parameters !== null && parameters.length > 0){
_this.pool.query(query, parameters, (err, res) => {
if(err){
console.error(query);
console.error(currentStack.stack);
}
if(callback !== undefined){
callback(err, res);
}
})
}else{
_this.pool.query(query, (err, res) => {
if(err){
console.error(query);
console.error(currentStack.stack);
}
if(callback !== undefined){
callback(err, res);
}
})
}
};
if(callback === undefined){
return new Promise((resolve, reject) => {
internal_query(query, parameters, (err, res) => {
if(err){
reject(err);
}else{
resolve(res);
}
});
});
}else{
internal_query(query, parameters, callback);
}
}
fetch(entity, query, parameters, callback){
let _this = this;
if(callback === undefined){
return new Promise((resolve, reject) => {
_this.query(query, parameters).then((res) => {
let objects = [];
if (res !== undefined && res.rows !== undefined && res.rows.length > 0) {
res.rows.forEach(function (object, index) {
let tmp = new entity();
tmp.populateObject(object);
objects.push(tmp);
});
}
resolve(objects);
}).catch((err) => {
reject(err);
});
});
}else {
this.query(query, parameters, (err, res) => {
let objects = [];
if (res !== undefined && res.rows !== undefined && res.rows.length > 0) {
res.rows.forEach(function (object, index) {
let tmp = new entity();
tmp.populateObject(object);
objects.push(tmp);
});
}
callback(err, objects);
});
}
}
getByUUID(entity, uuid, callback){
let _this = this;
if(callback === undefined){
return new Promise((resolve, reject) => {
_this.fetch(entity, "SELECT * FROM " + entity.getEntity() + " WHERE uuid = $1 LIMIT 1", [uuid]).then((res) => {
let object = undefined;
if (res !== undefined && res.length > 0) {
object = res[0];
}
resolve(object);
}).catch((err) => {
reject(err);
});
});
}else {
this.fetch(entity, "SELECT * FROM " + entity.getEntity() + " WHERE uuid = $1 LIMIT 1", [uuid], (err, res) => {
let object = undefined;
if (res !== undefined && res.length > 0) {
object = res[0];
}
callback(err, object);
});
}
}
/**
* Allows queries to retrieve only desired fields, object will return with a readonly flag and cannot be saved
* @param entity
* @param query
* @param parameters
* @param callback
*/
fetchPartial(entity, query, parameters, callback){
let _this = this;
if(callback === undefined){
return new Promise((resolve, reject) => {
_this.query(query, parameters).then((res) => {
let objects = [];
if(res !== undefined && res.rows !== undefined && res.rows.length > 0){
res.rows.forEach(function(object, index){
let tmp = new entity();
tmp.populateObject(object, true);
objects.push(tmp);
});
}
resolve(objects);
}).catch((err) => {
reject(err);
});
});
}else{
this.query(query, parameters, (err,res)=>{
let objects = [];
if(res !== undefined && res.rows !== undefined && res.rows.length > 0){
res.rows.forEach(function(object, index){
let tmp = new entity();
tmp.populateObject(object, true);
objects.push(tmp);
});
}
callback(err, objects);
});
}
}
list(entity, callback){
let query = "SELECT * FROM " + entity.getEntity();
return this.fetch(entity, query, [], callback);
}
exists(entity, uuid, callback){
let _this = this;
const query = "SELECT uuid FROM " + entity.getEntity() + " WHERE uuid = $1 LIMIT 1;";
if(callback === undefined){
return new Promise((resolve, reject) => {
_this.query(query, [uuid], (err, res)=>{
if(res !== undefined && res.rows !== undefined && res.rows.length > 0){
resolve(true);
}else{
resolve(false);
}
});
});
}else{
this.query(query, [uuid], (err, res)=>{
if(res !== undefined && res.rows !== undefined && res.rows.length > 0){
callback(true);
}else{
callback(false);
}
});
}
}
/**
* Connect method starts connection pool
* @param config
*/
connect(config){
configIsset(config, 'user');
configIsset(config, 'host');
configIsset(config, 'database');
configIsset(config, 'password');
configIsset(config, 'port');
configIsset(config, 'schema');
this.config = config;
let postgre_config = {
user: config.user,
host: config.host,
database: config.database,
password: config.password,
port: config.port,
};
this.pool = new Pool(postgre_config);
PlasmaJs.setConnection = this;
PlasmaJs.setSchema = this.config.schema;
return this.pool.connect();
}
/**
* closeConnection must be called before closing the script to free up connection on server
*/
closeConnection(){
this.pool.end();
}
static get getSchema(){
return this.schema;
}
static get getConnection(){
return this.connection;
}
static set setConnection(connection){
this.connection = connection;
}
static set setSchema(schema){
this.schema = schema;
}
}
export default PlasmaJs;
/* PRIVATE */
function configIsset(object, key){
if(object[key] === undefined){
throw new Error("Missing required parameter '" + key + "'");
}
}