Perf Analytics Backend Code

Getting Started

Set environment (vars):

cp .env.example .env

Start DB:

cd db
docker-compose up

Start server:

# Start server
yarn start

# Selectively set DEBUG env var to get logs
DEBUG=express-mongoose-es6-rest-api:* yarn start

Refer debug to know how to selectively turn on logs.

Tests:

# Run tests written in ES6 
yarn test

# Run test along with code coverage
yarn test:coverage

# Run tests on file change
yarn test:watch

# Run tests enforcing code coverage (configured via .istanbul.yml)
yarn test:check-coverage

Lint:

# Lint code with ESLint
yarn lint

# Run lint on any file change
yarn lint:watch

Other gulp tasks:

# Wipe out dist and coverage directory
gulp clean

# Default task: Wipes out dist and coverage directory. Compiles using babel.
gulp

Deployment

# compile to ES5
1. yarn build

# upload dist/ to your server
2. scp -rp dist/ user@dest:/path

# install production dependencies only
3. yarn --production

# Use any process manager to start your services
4. pm2 start dist/index.js

In production you need to make sure your server is always up so you should ideally use any of the process manager recommended here. We recommend pm2 as it has several useful features like it can be configured to auto-start your services if system is rebooted.

Logging

Universal logging library winston is used for logging. It has support for multiple transports. A transport is essentially a storage device for your logs. Each instance of a winston logger can have multiple transports configured at different levels. For example, one may want error logs to be stored in a persistent remote location (like a database), but all logs output to the console or a local file. We just log to the console for simplicity, you can configure more transports as per your requirement.

API logging

Logs detailed info about each api request to console during development.

Error logging

Logs stacktrace of error to console along with other details. You should ideally store all error messages persistently.

Code Coverage

Get code coverage summary on executing yarn test

yarn test also generates HTML code coverage report in coverage/ directory. Open lcov-report/index.html to view it.

Docker

Using Docker Compose for Development

# service restarts on file change
bash bin/development.sh

Building and running without Docker Compose

# To use this option you need to make sure mongodb is listening on port 27017

# Build docker 
docker build -t express-mongoose-es6-rest-api .

# Run docker
docker run -p 4040:4040 express-mongoose-es6-rest-api

kerematam/perf-analytics-be