Sentry OpenTelemetry/Node Sample Application

This repository contains a set of Node.js/Express services that provide a simple multi-tier application that lets you vote for using spaces versus tabs in code.

voting-frontend renders the website using data fetched from voting-service-gateway.
voting-service-gateway randomly toggles between voting-service-green and voting-service-green and passes the request through to the respective service.
voting-service-green provides the access layer to MongoDB where the data is stored.
voting-service-blue represents a faulty version and returns an error.

Installation

This sample expects MongoDB to be running on localhost:27017 - please install the community edition following the instructions for your platform.
After downloading/cloning this repository open your console, change into the root of the repository and run install.sh to install all dependencies. This can take a while.
While still in the root directory, run npx pm2 startOrRestart ecosystem.config.js. Answer "yes" if you are prompted if pm2 should be downloaded.
(To stop all services, run npx pm2 stop ecosystem.config.js.)

Setting up Sentry

Copy .env-sample and rename it to .env.
In Sentry, create the following projects and edit .env to set the respective DSN:

browser (JS)
frontend (Express)
gateway (Express)
service-green (Express)
service-blue (Express)

Restart all services by running npx pm2 startOrRestart ecosystem.config.js.

Using the Sample Application

The frontend at localhost:8080. Use the buttons to cast your vote. Every time a ☠️ is shown instead of the tally, you hit the faulty service-blue.

Troubleshooting

If you can't access the frontend, or voting doesn't work, run pm2 status and look for a service with status error. Do get the logs for a service, run pm2 logs servicename.

Known Issues