Evidence

Evidence is a service that provides HTTP descriptors for making pre-signed requests and keep track of uploads in progress.

Docs

You can read about the service capabilities here

Development

Requirements

• Docker https://docs.docker.com/compose/install/
• Makefile

Commands

• Boot up development server on http://localhost:7000: make up
• Run tests: make test
• Show logs: make logs
• Stop services: make down
• Clean up: make clean

Test

Suites available

• end2end
• features
• integration
• health

Any of the above mentioned test suites can be executed by running:

make test-<suite-name>

end2end

This suite checks that the service HTTP API provides the capabilities expected by its consumers.

It is an out of process test, i.e, it execises the service as a deployed artifact. To achieve this it uses stubbed external services.

For example it uses minio as an s3 stub.

features

This suite checks the behaviour of each endpoint. It relies on the app booted in test mode, this way more variabilty can be introduced and errors and exceptions can be tested in a faster and controlled manner.

It is an in process test, i.e, endpoints are excesided directly (not via HTTP) and external services are consumed via stubbed clients.

For example, it uses a stubbed s3 client.

integration

This suite checks that the gateways behaviour is the expected. To achieve this it consumes the stubbed external service.

For example, when testing Warehouse::Gateway consumes minio in order to check that it can retrieve pre-signed request instructions.

health

This suite checks that the health endpoint behaviour is the expected.

CI

This project is integrated with Travis CI: https://travis-ci.org/sapagat/evidence

Production

Dependencies

• Amazon S3
• Redis

Note You can check if the dependencies are met by checking the health endpoint: GET /health

Environment variables

The following environment variables must be set:

RACK_ENV=production

AUTH_TOKEN=<shared-key>

S3_BUCKET=<bucket-name>
S3_REGION=<region>
S3_ACCESS_KEY_ID=<access-key-id>
S3_SECRET_ACCESS_KEY=<secret-access-key>

REDIS_URL=<redis-url>
REDIS_TIMEOUT=<redis-timeout>

Procfile

Use a Procfile, a text file in the root directory of your application, to explicitly declare what command should be executed to start your app.

An example app you deployed looks like this:

web: bundle exec rackup config.ru -p $PORT