resource-watch/layer

const Koa = require('koa');
const logger = require('logger');
const koaLogger = require('koa-logger');
const mongoose = require('mongoose');
const config = require('config');
const loader = require('loader');
const koaSimpleHealthCheck = require('koa-simple-healthcheck');
const { RWAPIMicroservice } = require('rw-api-microservice-node');
const ErrorSerializer = require('serializers/error.serializer');
const koaValidate = require('koa-validate');
const koaBody = require('koa-body');

let mongooseOptions = require('../../config/mongoose');

const mongoUri = process.env.MONGO_URI || `mongodb://${config.get('mongodb.host')}:${config.get('mongodb.port')}/${config.get('mongodb.database')}`;

// KUBE CLUSTER
if (mongoUri.indexOf('replicaSet') > -1) {
    mongooseOptions = {
        ...mongooseOptions,
        db: { native_parser: true },
        replset: {
            auto_reconnect: false,
            poolSize: 10,
            socketOptions: {
                keepAlive: 1000,
                connectTimeoutMS: 30000
            }
        },
        server: {
            poolSize: 5,
            socketOptions: {
                keepAlive: 1000,
                connectTimeoutMS: 30000
            }
        }
    };
}

async function init() {
    return new Promise((resolve, reject) => {
        async function onDbReady(err) {
            if (err) {
                logger.error('MongoURI', mongoUri);
                logger.error(err);
                reject(new Error(err));
            }

            const app = new Koa();

            app.use(koaBody({
                multipart: true,
                jsonLimit: '50mb',
                formLimit: '50mb',
                textLimit: '50mb'
            }));

            app.use(async (ctx, next) => {
                try {
                    await next();
                } catch (inErr) {
                    let error = inErr;
                    try {
                        error = JSON.parse(inErr);
                    } catch (e) {
                        logger.debug('Could not parse error message - is it JSON?: ', inErr);
                        error = inErr;
                    }

                    ctx.status = error.status || ctx.status || 500;
                    if (ctx.status >= 500) {
                        logger.error(error);
                    } else {
                        logger.info(error);
                    }

                    ctx.body = ErrorSerializer.serializeError(ctx.status, error.message);
                    if (process.env.NODE_ENV === 'prod' && ctx.status === 500) {
                        ctx.body = 'Unexpected error';
                    }
                    ctx.response.type = 'application/vnd.api+json';
                }
            });

            app.use(koaSimpleHealthCheck());
            app.use(koaLogger());

            koaValidate(app);

            app.use(RWAPIMicroservice.bootstrap({
                logger,
                gatewayURL: process.env.GATEWAY_URL,
                microserviceToken: process.env.MICROSERVICE_TOKEN,
                fastlyEnabled: process.env.FASTLY_ENABLED,
                fastlyServiceId: process.env.FASTLY_SERVICEID,
                fastlyAPIKey: process.env.FASTLY_APIKEY,
                requireAPIKey: process.env.REQUIRE_API_KEY || true,
                awsCloudWatchLoggingEnabled: process.env.AWS_CLOUD_WATCH_LOGGING_ENABLED || true,
                awsRegion: process.env.AWS_REGION,
                awsCloudWatchLogStreamName: config.get('service.name'),
            }));

            loader.loadRoutes(app);

            const port = process.env.PORT || '3000';

            const server = app.listen(port, () => {
                logger.info('Server started in ', port);
                resolve({ app, server });
            });
        }

        logger.info(`Connecting to MongoDB URL ${mongoUri}`);
        mongoose.connect(mongoUri, mongooseOptions, onDbReady);
    });
}

module.exports = init;