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definma-api/src/db.ts

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import mongoose from 'mongoose';
import cfenv from 'cfenv';
// database urls, prod db url is retrieved automatically
const TESTING_URL = 'mongodb://localhost/dfopdb_test';
const DEV_URL = 'mongodb://localhost/dfopdb';
export default class db {
private static state = { // db object and current mode (test, dev, prod)
db: null,
mode: null,
};
static connect (mode = '', done: Function = () => {}) { // set mode to test for unit/integration tests, otherwise skip parameter. done is also only needed for testing
if (this.state.db) return done(); // db is already connected
// find right connection url
let connectionString: string = "";
if (mode === 'test') { // testing
connectionString = TESTING_URL;
this.state.mode = 'test';
}
else if(process.env.NODE_ENV === 'production') {
let services = cfenv.getAppEnv().getServices();
for (let service in services) {
if(services[service].tags.indexOf("mongodb") >= 0) {
connectionString = services[service]["credentials"].uri;
}
}
this.state.mode = 'prod';
}
else {
connectionString = DEV_URL;
this.state.mode = 'dev';
}
// connect to db
mongoose.connect(connectionString, {useNewUrlParser: true, useUnifiedTopology: true}, err => {
if (err) done(err);
});
mongoose.connection.on('error', console.error.bind(console, 'connection error:'));
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mongoose.connection.on('disconnected', () => { // reset state on disconnect
console.log('Database disconnected');
this.state.db = 0;
done();
});
process.on('SIGINT', () => { // close connection when app is terminated
mongoose.connection.close(() => {
console.log('Mongoose default connection disconnected through app termination');
process.exit(0);
});
});
mongoose.connection.once('open', () => {
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console.log(process.env.NODE_ENV === 'test' ? '' : `Connected to ${connectionString}`);
this.state.db = mongoose.connection;
done();
});
}
static getState () {
return this.state;
}
static drop (done: Function = () => {}) { // drop all collections of connected db (only dev and test for safety reasons ;)
if (!this.state.db || this.state.mode === 'prod') return done(); // no db connection or prod db
this.state.db.db.listCollections().toArray((err, collections) => { // get list of all collections
if (collections.length === 0) { // there are no collections to drop
return done();
}
else {
let dropCounter = 0; // count number of dropped collections to know when to return done()
collections.forEach(collection => { // drop each collection
this.state.db.dropCollection(collection.name, () => {
if (++ dropCounter >= collections.length) { // all collections dropped
done();
}
});
});
}
});
}
static loadJson (json, done: Function = () => {}) { // insert given JSON data into db, uses core mongodb methods
if (!this.state.db || !json.hasOwnProperty('collections') || json.collections.length === 0) {
return done();
} // no db connection or nothing to load
let loadCounter = 0; // count number of loaded collections to know when to return done()
Object.keys(json.collections).forEach(collectionName => { // create each collection
this.state.db.createCollection(collectionName, (err, collection) => {
collection.insertMany(json.collections[collectionName], () => { // insert JSON data
if (++ loadCounter >= Object.keys(json.collections).length) { // all collections loaded
done();
}
});
});
});
}
};