api/database.js at develop · MusicConnectionMachine/api · GitHub

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constpath=require('path');
constfs=require('fs');

varcontext;

module.exports={
start: function(callback=()=>{}){

// Imports
constpg=require('pg');
constSequelize=require('sequelize');

console.log('Initializing context');
// Initialize the context
context={
fs: fs,
pg: pg,
path: path,
Sequelize: Sequelize,
constants: {},
models: {}
};

callback(context);
returncontext;
},

connect: function(postgresCS,callback=()=>{},logging){
constcontext=this.createContext(postgresCS,logging);

returnthis.loadModels()
.then(()=>{
returncontext.sequelize.authenticate()
})
.then(()=>{
returncontext.sequelize.sync()
})
.then(()=>{
console.log('Connection has been established successfully.');
returncallback(context);
},(err)=>{
console.error(err);
returnprocess.exit(1);
});
},

loadModels: function(){
constmodelBasePath=path.join(__dirname,'api','models');

returnnewPromise(function(resolve,reject){
fs.readdir(modelBasePath,(err,files)=>{

if(err){
reject(err);
return;
}

files.forEach((file)=>{
constmodel=context.sequelize.import(path.join(modelBasePath,file));
context.models[model.name]=model;
});

// initialize relationships
Object.keys(context.models).forEach(function(modelName){
if("associate"incontext.models[modelName]){
context.models[modelName].associate(context.models);
}
});

resolve();
});
});
},

createContext: function(postgresCS,logging){
context=this.start();

vardbConfig=require('./config.js.template');

//Create the DB connection string
vardatabaseParams=dbConfig.database;
context.config=databaseParams;

if(logging===undefined){
logging=dbConfig.general.logging;
}

varconfigDB={
database: databaseParams.collection,//env var: PGDATABASE
username: databaseParams.username,
password: databaseParams.password,
host: databaseParams.host,// Server hosting the postgres database
port: databaseParams.port,//env var: PGPORT
max: 10,// max number of clients in the pool
min: 0,
idleTimeoutMillis: 30000,// how long a client is allowed to remain idle before being closed

};

constdatabaseURI=postgresCS||process.env.databaseuri;

if(databaseURI){
//logging is enabled by default
dbConfig.logging=logging;
dbConfig.pool={
max: 1,
min: 0
};
context.sequelize=newcontext.Sequelize(databaseURI,dbConfig);
}else{
context.sequelize=newcontext.Sequelize(configDB.database,configDB.username,configDB.password,{
host: configDB.host,
dialect: 'postgres',
port: configDB.port,
pool: {
max: configDB.max,
min: configDB.min,
idle: configDB.idleTimeoutMillis
},
logging: logging
});
}

returncontext;
},

getContext: function(){
if(context){
returncontext;
}
console.log('Failed to retrieve context: context doesn\'t exist.');
}
};