mpareja / gearshaft-example

Gearshaft usage example

Gearshaft Example Projection

An example is often worth a thousand words. This repository is provided as an example of how to leverage Gearshaft to run autonomous components. There is a registration component which is setup to be run inside a single host.

Quick Start

1. Run a Postgres instance
2. Provision a message store database
3. Configure the Postgres credentials used by the example
4. Run the tests: npm test
5. Run the host: npm run dev
6. Write a test message: node registration/test/interactive/create-registration.js

Running Postgres

Use Docker to run Postgres or install Postgres from scratch. The automated tests expect the following defaults which can be overriden:

• HOST: localhost
• PORT: 5432 (Postgres default)
• USER: postgres
• PASS: NInAN5t3kJo8d7I3

You can run Postgres with docker as follows:

docker run --name pg -d -p 5432:5432 -e POSTGRES_PASSWORD=NInAN5t3kJo8d7I3 postgres:10.5

Terminate Postgres and delete all data as follow:

docker rm -fv pg

Provisioning Message Store Database

1. Install the Postgres client (psql)

   Ubuntu: sudo apt install postgresql-client

2. (Re)create the message store database and user credentials

   If you are using the default (compromised) credentials, simply run: npm run recreate.

   If you are not using the default credentials, customize these commands as necessary:

   1. Create the message_store database:

      PGHOST=localhost \
        PGUSER=postgres \
        PGPASSWORD=NInAN5t3kJo8d7I3 \
        ./gems/bin/evt-pg-recreate-db
      

   2. Assign the message_store user a password:

      PGHOST=localhost \
        PGUSER=postgres \
        PGPASSWORD=NInAN5t3kJo8d7I3 \
        psql -c "alter role message_store with password 'NInAN5t3kJo8d7I3';"
      

Configuring Postgres Credentials

The configuration is managed using the rc module. Create a .gearshaft_examplerc file in the project root directory with the following fields to customize the Postgres connection settings:

{
  "postgres": {
    "host": "some-host-name",
    "user": "some-pg-user",
    "password": "some-pg-pass",
    "database": "some-pg-database"
  }
}