Load testing of GraphQL API

This is a project used for talk "Load testing made easy with Gatling".

There are three submodules in this project:

• server - sample application for which load tests are written, using Grackle
• load-tests - load tests (using Gatling), testing sample application (server)
• test-data - simple util to help populate database with some noticeable amount of data, using Mockaroo service

Prerequisites

Start local database

Start local database (PostgreSQL) in docker (it will be started in the background):

./start-local-docker-compose.sh

Run migrations:

sbt flywayMigrate

Load data into database

You need to get API key for Mockaroo (free version) and put that as environment variable (MOCKAROO_API_KEY) or create file .env.sh with it:

#!/bin/bash

export MOCKAROO_API_KEY=<put_your_api_key_here>

There is a public dataset that this project is using: https://mockaroo.com/e11c4970

To populate the database with 500 companies (using dataset from Mockaroo) you can invoke below sbt run command:

sbt test-data/run

Note: There is no need to run migrations and populate the local database every time you start it, docker-compose file defines volume for PostrgreSQL, so data will be available there (until you intentionally remove docker volume).

Run the server

sbt server/run

Invoke load tests

Invoke all tests (a.k.a. Gatling simulations):

sbt "load-tests/Gatling/test"

Invoke test for query company by id:

sbt "load-tests/Gatling/testOnly io.github.rpiotrow.simulations.CompanyGraphQLQuerySimulation"

Invoke test for query company list:

sbt "load-tests/Gatling/testOnly io.github.rpiotrow.simulations.CompaniesGraphQLQuerySimulation"

Stop local database (clean up)

Stop local database:

./stop-local-docker-compose.sh